Sample records for genkai genshiryoku hatsudensho

  1. Refurbishment of Secondary System and High AVT Water Treatment of GENKAI # 1 and # 2 (United States)

    Manabe, Jun; Shoda, Yasuhiko; Yamamura, Tatsushi; Kusumoto, Yuuichiro

    Kyushu Electric Power Company Genkai #1 and #2 are twin 500 MW class first generation PWR power stations starting their commercial operation in 1975-1981. The units were recently altered their secondary water treatment from AVT to HAVT (High All Volatile Treatment) operation aiming to suppress erosion in piping and equipment, resulting in both feed water iron concentration reduction to around 1 ppb as an indication of the effects and scale adhesion reduction of feed water pumps and feed water heaters. The units had been successfully operated from the start of their commercial operation except for scale adhesion to SG and others, degradation of copper alloy material tubes in auxiliary heat exchangers and lower condenser vacuum derived from protective ferrous sulfate coating. Life cycle management program was implemented resulting in the alteration of water treatment to HAVT adopting both the SG blow down demineralizing and the replacement of copper alloy tube heat exchangers to stainless steel and titan tubes eliminating the copper materials. Further more the scale adhesion mechanism was introduced of the high temperature region of the secondary system based on field examination for iron characterization of both AVT and of HAVT in Genkai units, confirming HAVT advantageous effect for prevention of the scale adhesion.

  2. Reality and limitations in application of adaptive control. Tekio seigyo no jissai to tekiyo genkai

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    Tomizuka, M. (Univ. of Calif., Berkeley (United States of America))


    Approximately 20 years have passed since adaptive control transformed from art to science as it sprouted up with a stability theory as a core thereof. In the meantime, many application cases have been reported, and the expectation for the adaptive control is uprising. In this report, the reality and the application limitation of the adaptive control from the standpoint of how to use it are described. Described items are as follows: Discrete type adaptive control based on pole placement - direct method. structure of the controller. adaptive control rule and parameter identification algorithm. problems inapplication - Examination of linearity. Model dimensions. Zero point of the control target. Influence of external disturbance. Adaptive feed forward control. Introduction of integral action. Influence of noise. It is important that the simplification of the whole algorithm and adaptation of the theory are made by fully utilizing the foresighted informations on the control targets by not only simply applying a genearalized theory to practice. 14 refs., 3 figs.

  3. Design and construction of Aratani hydroelectric power plant; Aratani suiryoku hatsudensho no sekkei to seko

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    Kishimoto, S.; Taniuchi, N.; Shoji, I. [Kansai Electric Power Co. Inc., Osaka (Japan)


    The power plant of Kansai Electric Power Co., Inc., is a run-off-river type with an available head of 273.6m, a maximum discharge of 5.0m{sup 3}/s, and a maximum output of 11,200kW, and is scheduled to come into service in 1998. The design dispenses with the spillway for reduction in construction cost. The surrounding geological conditions are quite hostile with many active faults. As for the area through which the water channel tunnel runs through, there is a valley named Nara that is a tectonic boundary, located a little upstream of the tunnel middle point. It was afraid there would be water gushing out because the soil cover is so thin as 60m along the boundary making the natural ground itself fragile. A CSA-MT (controlled-source audio-frequency magnetotelluric) exploration was conducted for predicting the volume to gush out and the result was found to agree excellently with the observed value, and the work went on with water draining borings performed as necessity. NATM (New Australian Tunnelling Method) was applied for excavation, and work type C-1, somewhere between work types C and D, was selected out of four work types A, B, C, and D, from the viewpoint of cost performance. Types A and B applicable to hard geological structures occupied only 1% in the whole process of excavation. Although the scheduled monthly progress of 130m was reduced to 100m due to difficulties caused by freshets and crushed fault zones, the tunnel was completed at the end of 1997. 4 refs., 10 figs., 4 tabs.

  4. Problems of adhering organisms in power stations. Hatsudensho ni okeru fuchaku seibutsu no mondai

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    Sakaguchi, Isamu (Central Research Inst. of Electric Power Industry, Tokyo (Japan))


    Much seawater is used in thermal power station in Japan to cool condensers but organisms adhered on the water channel system result many troubles such as increase of flowing resistance, reduction of thermal transfer efficiendy, corrosion or erosion-corrosion of condenser pipes, and cleaning difficulty for periodic inspection. Living organisms range from micro bacteria of 2 mum to oysters and others of about 10cm size. For these reasons, the intake open channel is previously designed to larger size and this margin is called the shellfish allowance. Mussels which adhere most on circulating water channels, are one of Bivalvia, grow to 3-6cm and in maximum case to 9cm in a year. These adhere on the surface base by secreting adhesive disc consisting of byssus. Barnacles are one of Crustacea and their larvas search preferable places as to light, roughness and water flow and can adhere on a place in considerably rapid water flow. Other organisms are bacteria and Hydrozoa. Many problems are caused by these organisms even now. 8 refs., 3 figs., 2 tabs.

  5. Critical heat flux in bottom heated two-phase thermosyphon. Improvement in critical heat flux due to concentric tube; Katan shuchu kanetsugata niso netsu syphon no genkai netsu ryusoku. Nijukan ni yoru genkai netsu ryusoku no kaizen

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    Monde, M.; Mitsutake, Y. [Saga University, Saga (Japan). Faculty of Science and Engineering


    An experiment has been carried out to elucidate the critical heat flux (CHF) of an open two-phase thermosyphon with a bottom heated chamber in which heat is absorbed by evaporation of liquid. Another objective is to enhance the CHF using a concentric-tube by which counter-current flow of vapor and liquid in the throat of the chamber can be controlled well. The CHF data are measured for the saturated liquid of R 113 at a different pressure and different configuration of concentric tubes. The CHF data without the inner tube are in good agreement with the existing correlation and analytical result. The CHF increases by as much as several times of the CHF without the inner tube with an increase in the inner tube diameter up to a certain diameter of the inner tube and then decreases continuously as the inner tube diameter approaches the outer tube diameter. The optimum diameter of inner tube exists at which the CHF is maximum. (author)

  6. On the building of Momoyama hydraulic power station on Kiso river. Kisogawa Momoyama suiryoku hatsudensho no kenchiku ni tsuite

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    Kotera, T. (Nagoya University, Nagoya (Japan). Faculty of Engineering)


    This paper investigates Momoyama hydraulic power station built on the middle reaches of the Kiso River in Uematsu-cho, Kiso-gun, Nagano Prefecture in Japan, in 1923 by relating to the feature of the building of the hydraulic power station and the architect, Shiro Sato. The hydraulic power station originally was a functional and industrial building which puts a priority on the efficiency of business economy, at the same time it was often required to present a beautiful appearance. The building of Momoyama hydraulic power station was founded on the crane girder structure covered with reinforced concrete(RC) walls. A Hat roof of RC slab was applied to the roof of the building. It was generally designed in Neo-Gothic style. More specifically, however, the wall surface was designed in church style and the upper part was like a castle in the middle ages. Therefore the total design was eclectic. The outer surfaces of the building were remained to be bare concrete as cast. Such a multiple building symbolizes the situation of Japanes architecture in the 1920s. 4 figs.

  7. Kurokawa 150-kW wind turbine generator demonstration; 150 kW Kurokawa furyoku hatsudensho ni tsuite

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    Okamoto, M.; Shinohara, M.; Sugiyama, T. [Kansai Electric Power Co. Inc., Osaka (Japan)


    This paper presents the 150kW wind turbine generator erected at a site near Kurokawa dam lake of Kansai Electric Power Co. in Hyogo prefecture. This generator is composed of a horizontal-axis propeller with 3 blades of 27m in diameter and 36/27rpm, and a tower of 30m high. Harmony with the environment was also considered because of the site in a natural park area. Its demonstration test started in Oct. 1996 at annual mean wind velocity of 2m/s. Soft start was realized by controlling inrush current and preventing voltage drop in system interconnection by use of a thyristor circuit. The dual operation system was adopted of a 30kW small generator at lower wind velocity and a 150kW large one at higher velocity. Two kinds of brakes are used, and rotor revolution was reduced by air brake (blade tip spoiler). Mechanical disk brake works for the stopped rotor or emergency stopping. Even if the wind turbine was stopped by exterior factor, if no anomaly of the turbine is found, it automatically re-starts after removal of the factor. The generator is controlled from a remote control station 150km apart through NTT communication line. 6 figs., 2 tabs.

  8. Effects of electrode properties on transition limit to big-arcs in combustion gas plasma boundary layer. Nensho gas plasma kyokaisonai deno daidenryu kyodai arc hassei genkai ni oyobosu denkyoku bussei no eikyo

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    Okazaki, K.; Okumura, Y. (Tokyo Institute of Technology, Tokyo (Japan)); Kokumai, M.; Yoshikawa, N. (Toyohashi University of Technology, Aichi (Japan))


    The effect of physical properties of electrode on the transition from micro-arc to big-arc in the boundary layer of combustion gas plasma such as MHD power generation, the method for preventing the occurrence of big-arc at the electrode surface side, and the possibility of small dispersion of micro-arc are experimentally investigated. The critical current for transition from micro-arc to big-arc is mainly determined by the main part temperature. It is also affected by the electrode properties. This is due to the change in arc shape caused by the heat transfer to the electrode surface and the melting and evaporation of the electrode. In the case of electrode which is likely to give rise to the abrupt gushing of metal vapor, the transition from micro-arc to big-arc is likely to occur because the boundary layer is easily broken as the momentum of the gushing vapor directed rectangularly to the electrode surface which is generating the micro-arc is large. For the prevention of transition from micro-arc to big-arc even at a large current density, it is important to select the electrode material which is characterized by high thermal conductivity, high boiling point, and high latent heat of evaporation. 17 refs., 15 figs., 1 tab.

  9. Development and application of robots for checking and repairing civil engineering facilities in hydraulic power plants. Suiryoku hatsudensho doboku setsubi wo taisho to shita kakushu tenken hoshu robot no kaihatsu to tekiyo

    Energy Technology Data Exchange (ETDEWEB)

    Nakamura, T.; Hibino, Y. (The Tokyo Electric Power Co. Inc., Tokyo (Japan))


    Development efforts are being made on robots to improve efficiency in the checking and repairing works that require a great amount of labor at hydraulic power plants. This paper introduces examples of the development and application of these robots. An underwater remotely controlled robot developed based on unmanned submarine boats mounts TV cameras, dives to a depth of 300 meters, and checks underwater structures under control from above the ground. A self-driven waterway investigating system mounting an underground radar equipment investigates tunnel covers and rear cavities, and can acquire continuous data for the cover thickness and cavities without a need of boring. The following robots have obtained satisfactory results in efficiency improvement and accuracy: an unmanned robot for checking inside of a waterway tunnel with small cross section difficult for a man to enter (using a video camera); a video photographing robot to photograph large underground cavities such as surge tanks; and a self-driven robot to visually inspect and photograph steel pipes and measure their thickness. 8 figs., 8 tabs.

  10. Construction of Hidaka Power Station discharge channel. TBM/ECL techniques as applied in countering methane blowing-out; Hidaka hatsudensho hosuiro tunnel no seko. Methane gas yushutsu chiso ni okeru TBM/ECL koho

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    Yokota, K.; Suzuki, H.; Kasai, H. [Hokkaido University, Sapporo (Japan)


    The construction site being located in a coal mining zone, machine excavation not requiring men at the tunnel face or blastings is employed for fear of methane gushing. The method adopted in this work involves TBM (tunnel boring machine), ECL (extruded concrete lining), and continuous belt conveyer, all excellent in terms of safety, workability, construction time, and cost. In this report, explosion-proof facilities are changed when an unexpectedly high rate of methane of not less than 5% is detected upon completion of 917m-long excavation, men are ordered out of the working site in the presence of 0.5% of methane, and electricity likely to cause fires is cut off when methane comes to occupy 1.0%. Horizontal boring is carried out for detecting methane. Although lining and spraying processes are required in the conventional method for preventing gas entrapment in between the support and ground, methane gushing is instantly suppressed in the method used here thanks to lining continuously installed in the TBM rear section. The method being a hermetic air bubble shield method, methane can enter only at the screw conveyer, and such can be effectively diluted by concentrated ventilation at the exit. The continuous belt conveyer is free of friction that may start fires, and the air duct ensures full ventilation for the tunnel. The construction time proves shorter by two months, demonstrating the usefulness of this method. 5 refs., 9 figs., 4 tabs.

  11. Tachibana Bay Electric Power Plant. Design and construction of pipe-laying works on the sea bottom for the industrial water; Tachibanawan hatsudensho. Kogyo yosui kaitei haikan koji no sekkei to seko

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    Shiono, A.; Tanaka, K. [Shikoku Electric Power Co., Inc., Takamatsu (Japan)


    At Kokatsu Island in the Bay of Tachibana, Anan City, Tokushima Prefecture, Tachibana Bay coal burning thermal electric power plants are now under construction. This is a joint venture of Shikoku electric Power Company and Dengen-kaihatsu (Power Resources Development Co.) with the objective of securing power supply in and after the year of 2000. The former plans one 700,000kW generator and the latter plans two 1.05 million kW generators totalling 2.8 million kW in terms of plant capacity. As for the above plants, the industrial water of 14,000m{sup 3} per day is required for various equipment including exhaust gas desulfurizers, etc. and the receiving and sending point of this industrial water is located at Ohgata Area, the northern opposite coast of this island. It is necessary to lay water pipes in the sea area from the above point up to Kokatsu Island, but this sea area lies within the important harbor designated for lanes and anchorages of vessels, hence traffic of vessels is heavy and restrictive conditions are many. Having studied various construction methods, the chain cutter simultaneous laying and burying method has been adopted. Three large calibre submarine water conveyance pipes, each of which is 250mm in inner diameter and about 2km long, have been built and the works have been completed at the end of June, 1997. 12 figs., 3 tabs.

  12. Outline of 3times77.5MW power plants for Malitobog geothermal power plant, Philippines; Philippines Malitobog chinetsu hatsudensho plant (77.5MW times 3 dai) no gaiyo

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    Ochiai, K.; Tanaka, N. [Fuji Electric Co. Ltd., Tokyo (Japan)


    Fuji Electric has constructed 3 geothermal power plants (77.5MW at each unit) in Leyte, the Philippines, and delivered them to the customer, Visayas Geothermal Power Company. This paper outlines these geothermal plants. They are installed in a mountainous area, approximately 600m above seal level, and approximately 132km to the southwest of City of Tacloban, the capital of Leyte and 530km to the southeast of Manila. The overall system has 20 production wells and 19 injection wells, each approximately 2,000 to 3,000m deep, with hot water predominant in the steam wells. Each of the 77.5MW turbines is of a single cylinder, 2 stream exhaust type, with a 658mm wide, low-pressure blade. The erosion-preventive measures include removal of drain, dispersion of droplets and reduction of impact by accelerated droplets and stellite shield, and the corrosion-preventive measures include selection of adequate materials, determination of adequate design stresses and padding of stainless steel for static blade holders. Hydrogen sulfide is removed by decomposing it into elementary sulfur. The plants have been in service since May, 1998. 4 refs., 16 figs., 3 tabs.

  13. Study on wind turbine for Yamagata wind energy institute. Comparison of the actual and estimate values for electric power; Yamagata furyoku hatsudensho no fusha ni tsuite. Hatsudenryo yosoku to jissekichi no hikaku

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    Nagai, H. [Nihon University, Tokyo (Japan); Kojima, T. [Yamagata Wind Energy Institute, Yamagata (Japan)


    For two 400kW wind turbines erected in Jan. 1996 of Yamagata Wind Energy Institute, their estimated power output was compared with actual output for 7 months. AMeDAS data in 1985-94 were totaled every month to use as basic data. The altitude and surface roughness model necessary for WAsP analysis recommended by NEDO`s wind condition close inspection manual were prepared using 1/25,000 maps and aerial photographs. The obstacle model for estimating wind conditions at height of the wind turbine was prepared using the data obtained by field survey. Mean wind velocity and latent energy were determined by statistical analysis of wind velocity occurrence relative frequencies and Weibull distribution parameters. The power output of 717,700kWh was obtained for 7 months, which is equivalent to 88.5% of the estimated output of 810,730kWh for the same period. It was clarified from obtained characteristic wind conditions at the site that the wind power generation is promising at the site not only in winter but also in summer. Although the test period was too short, this method was effective as analytical method of output estimation in the planning stage of wind turbines. 3 refs., 8 figs., 4 tabs.

  14. Haramachi Thermal Power Plant design and works of marine independent drainage and buried continuous wall shaft; Haramachi Kryoku Hatsudensho kaijo dokuritsugata hosuiko to chichu renzokuheki tateko no sekkei/seko

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    Takashima, N.; Sato, S. [Tohoku Electric Power Co. Ltd., Sendai (Japan)


    For the drainage of condenser cooling water watercourse of the power generator No.1 and No.2 of Haramachi thermal power plant, a submarine tunnel system was adopted in the consideration of geological character around the plant, economy, and relation to the other civil works. The undersea drainage system was adopted since it gave the least effect on the environment. The water course shaft is located just below the drain outlet. The shaft wall was constructed according to the buried continuous wall work method, and the buried continuous wall that was adopted to drill its inside. The design and works of special works such as marine independent drainage and buried continuous wall shaft were described. The outline of novel techniques adopted in the works were also reported. The novel techniques are: (1) Improvement in work efficiency and horizontal accuracy by adopting the torsion measurement equipment, (2) Stabilization of drilling work by adopting the PHPA stabilizer liquid (copolymer of acrylamide and acrylic acid), and (3) Reduction of waste volume by using the flocculant in the effluent treatment process. 7 refs., 13 figs., 7 tabs.

  15. Suppression of inducer stall based on inlet recirculation in a centrifugal impeller. 1st Report. Improvement in stall limit by ring groove arrangement; Enshin haneguruma iriguchi junkanryu ni yoru inducer shissoku no yokusei. 1. kanjoko ni yoru shissoku genkai no kaizen

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    Ueki, H.; Ishida, M.; Sakaguchi, D.; Sun, Z. [Nagasaki University, Nagasaki (Japan). Faculty of Engineering


    A ring groove arrangement is proposed to suppress unstable flow or surge in a centrifugal blower. The ring groove arrangement connects the upstream position of impeller inlet and the inducer throat tip through a bypass. The recirculation flow 'vas formed by the pressure difference between the two positions, and the recirculation flow rate was changed by increasing the ring groove widths. The inlet recirculation results in a decrease in the flow rate of unstable flow inception, and an up to 800 improvement in stall limit was obtained by the ring groove arrangement at a small expense of the delivery pressure drop. The improvement of stall limit in the present experiment seems to be mainly due to decrease in flow incidence based on the inlet recirculation flow. Tre flow incidence decreases more as the recirculation flow rate increases, thus resulting in a larger improvement in stall limit. (author)

  16. 日本近代国语辞书探源——以《言海》与《和英语林集成》为中心%The Beginning of Modern Japanese Language Dictionaries: GenKai and A Japanese and English dictionary

    Institute of Scientific and Technical Information of China (English)




  17. Study of thermal threshold and counter-measures for human body in oceanic working environment. 1st Report. Heat balance model and heat storage index; Shonetsu kankyoka no kaiyo sagyo ni okeru netsuteki genkai to onnetsu taisaku ni kansuru kenkyu. 1. Netsu shushi model to onnetsu shisu

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    Fukuchi, N. [Kyushu University, Fukuoka (Japan). Faculty of Engineering; Nakamura, M. [Tokyo Gakugei University, Tokyo (Japan); Murayama, M.


    Identification was intended on effects of such thermal factors as metabolic amount, environmental temperature and humidity, and clothing resistance on human body temperatures during works under hot environments. Therefore, measurements were carried out on human skin temperatures, rectum temperatures and humidity inside clothing, while amount of motion, environmental temperature, and clothing are changed in a constant temperature room and under a sun irradiation environment. Furthermore, a heat balance model was prepared, which divides the objects into an outer shell layer whose temperature changes depending on the result of this experiment and into a core having constant temperature characteristics. An equation to derive skin temperatures was introduced from the model. The equation formulated a calculation formula for heat accumulation in human body, which can be used as a hot heat index. Relationship between thermal factors and heat storage amount was investigated to consider a thermal limit for a physical work. An equation to derive skin temperatures was confirmed capable of expressing general change in skin temperatures, being proved by comparison with experiments. Calculation formulas for amount of heat stored in human body were shown capable of expressing influence of different thermal factors, the expression being useful as a hot heat index. Calculating the human body heat storage is very largely affected by effect of sweat to dissipate heat, hence it is necessary to improve the accuracy including that for body temperature adjusting reactions. 17 refs., 17 figs., 5 tabs.

  18. Strength of roadbeds built of solidified coal ash or foamed asphalt. Application thereof to temporary roads for construction work in Tachibanawan power plant site; Sekitanbai kokatai roban to formed asphalt roban no kyodo tokusei. Tachibanawan hatsudensho konai kari doro eno tekiyo jirei to hyoka

    Energy Technology Data Exchange (ETDEWEB)

    Suesawa, H.; Iwahara, H.; Isakura, M. [Shikoku Electric Power Co., Inc., Kagawa (Japan)


    For the construction of a solidified coal ash roadbed, desulfurized gypsum and a small amount of slaked lime are added to coal ash that is the main material, moisture is adjusted, the resultant moist powder is mixed in a screw-type mixer and transported aboard a dump truck to the construction site, and then solidified by rollers. The material is easy to install, and the roadbed is high in serviceability. With no serious damage occurring in the paved surface for nine months after the placement, the road keeps on functioning satisfactorily as a provisional road for use in the execution of the construction work. Foamed asphalt is prepared by adding water to asphalt in the liquid state at high temperature for the formation of fine foam for a 10-15 times expansion of the asphalt volume. Such asphalt is lower in surface tension and enhanced in adhesiveness to other materials, and mixes completely with the road materials at normal temperature for the construction of a reinforced roadbed. The foamed asphalt covers only fine aggregate but not coarse aggregate, and the latter is tightly solidified by bitumen etc. by tamping for the realization of a strong structure. Foamed asphalt is a material that works effectively when used for a road where dynamic load is dominant. 8 refs., 18 figs., 7 tabs.

  19. Design and engineering of west-side revetment for Tachibana Bay Power Station. Swelling behavior of sand compaction pile improved ground and mechanical properties of composite ground; Tachibanawan hatsudensho Nishigogan koji no sekkei to seko. Sand compaction pile kairyo jiban no moriagari kyodo to fukugo jiban no rikigaku tokusei

    Energy Technology Data Exchange (ETDEWEB)

    Kameda, S.; Hara, J.; Ozaki, S. [Shikoku Electric Power Co., Inc., Kagawa (Japan)


    This report covers a sand compaction pile (SCP) process performed for the improvement of the sea bottom along the west-side revetment of the power station where a 10-odd meter thick sedimentary layer of soft clayey soil exists. Since the sea is only 5m deep in this area, an engineering method is chosen capable of minimizing the swelling of the ground, and changes in the physical properties of the composite ground that may affect the stability of the revetment are investigated. In this report, an estimating equation is proposed for accurately predicting the swelling, including the additional swelling of the ground already swollen, to result from the SCP-assisted improvement of the ground and a description is given of changes in composite ground mechanical properties induced by the SCP-assisted engineering work. A `one-directional construction system with one block constituted of three spans` is contrived. Furthermore, an estimating technique taking into account the secondary swelling is proposed. As the result, the apparent swelling rate agrees very well with the actual swelling rate. An SCP method with its capability enhanced may be established by considering time-dependent changes in the mechanical properties of the clayey soil between piles and their impact on the safety factor. 4 refs., 13 figs., 3 tabs.

  20. Research report of FY 1997 on the environmentally acceptable coal utilization system introduction support project. Follow-up project on circulating fluidized bed boiler introduction (Calaca Batangas Thermal Power Station); 1997 nendo chosa hokokusho. Kankyo chowagata sekitan riyo system donyu shien jigyo (junkan ryudosho boiler ni kakawaru follow up jigyo (Calaca Batangas karyoku hatsudensho))

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    For the follow-up project, to promote the diffusion of results of the clean coal technology (CCT) model projects, experts of circulating fluidized bed boilers were dispatched, to guide and advise for the operation of facilities introduced in these projects. The purpose of these projects is to diffuse the CCTs, and to support the promotion of environmental measures. Some guidance and advice about operation processes, data processing, operation regulation, maintenance, and boiler maintenance works were provided to the Ministry of Energy and Electric Power Corporation of the Philippines. Semirara, Malangas, and Samar coals in the Philippines were used for the tests. The boiler facilities could be operated by Philippine operators themselves. Based on the guidance and advice about operation processes, combustion tests using various Philippine coals were also planned and conducted by themselves. The maintenance techniques were transferred to Philippine operators through the inspection, repair and advice. The Philippine side understood the technologies well, and the circulating fluidized bed boiler technology was independently educated in the Philippines. 23 figs., 16 tabs.

  1. Recent operating experiences with steam generators in Japanese NPPs

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    Yashima, Seiji [Japan Power Engineering and Inspection Corp., Tokyo (Japan)


    In 1994, the Genkai-3 of Kyushu Electric Power Co., Inc. and the Ikata-3 of Shikoku Electric Power Co., Inc. started commercial operation, and now 22 PWR plants are being operated in Japan. Since the first PWR plant now 22 PWR plants are being operated in was started to operate, Japanese PWR plants have had an operating experience of approx. 280 reactor-years. During that period, many tube degradations have been experienced in steam generators (SGs). And, in 1991, the steam generator tube rupture (SGTR) occurred in the Mihama-2 of Kansai Electric Power Co., Inc. However, the occurrence of tube degradation of SGs has been decreased by the instructions of the MITI as regulatory authorities, efforts of Electric Utilities, and technical support from the SG manufacturers. Here the author describes the recent SGs in Japan about the following points. (1) Recent Operating Experiences (2) Lessons learned from Mihama-2 SGTR (3) SG replacement (4) Safety Regulations on SG (5) Research and development on SG.

  2. Fiscal 1998 research report. Feasibility survey on offshore wind power generation in Japan; 1998 nendo chosa hokokusho. Nippon ni okeru yojo furyoku hatsuden no donyu kanosei chosa

    Energy Technology Data Exchange (ETDEWEB)



    This survey studied the feasibility of large-scale offshore wind power generation in Japan. Attempt was also made on preparation of outline maps of offshore wind around Japan. The cost of future offshore wind power generation systems is roughly dependent on technical issues and environmental issues. As technical issues, 'installation site,' 'foundation,' 'system interconnection' and 'maintenance/management' were summarized based on applications in Europe. As a result, it was clarified that technical issues can be solved with existing technologies to a certain extent, however, those relate to economical problems closely. The previous environment impact assessments say that wind power generation has no problems on the environmental issues. As relatively strong wind coastal areas, the outline maps of offshore wind point out Western Hokkaido area, Japan Sea area of Tohoku district, Pacific ocean area of the central part of Honshu, Genkai Nada area, Western Kyushu area and Southwest islands area, and suggest that these areas are promising for offshore wind power generation. (NEDO)

  3. Treatment adherence to disease-modifying antirheumatic drugs in Chinese patients with rheumatoid arthritis

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    Xia Y


    Full Text Available Yunfei Xia,1,* Rulan Yin,1,2,* Ting Fu,1,2 Lijuan Zhang,1,2 Qiuxiang Zhang,1,2 Genkai Guo,1 Liren Li,2 Zhifeng Gu11Department of Rheumatology, Affiliated Hospital of Nantong University, 2School of Nursing, Nantong University, Nantong, People’s Republic of China *These authors contributed equally to this work Objective: Nonadherence in rheumatoid arthritis (RA patients using disease-modifying antirheumatic drugs (DMARDs may lead to joint damage and function loss. The aim of this cross-sectional study was to explore Chinese RA patients’ adherence rates and investigate potential risk factors for nonadherence.Methods: A total of 122 RA patients were recruited from the Affiliated Hospital of Nantong University from January 2014 to April 2015. Patients were asked to complete a set of standardized self-report questionnaires (Compliance Questionnaire on Rheumatology, Health Assessment Questionnaire, Short Form-36 questionnaire, 28-joint Disease Activity Score, Hospital Anxiety and Depression Scale, and Visual Analog Scale. Independent samples t-tests, chi-square analyses, and logistic regression modeling were used to analyze these data.Results: Based on Compliance Questionnaire on Rheumatology, 38% of the patients adhered to DMARDs. Adherence was associated with education, income, depression, and the total number of DMARDs. Other demographic and clinical characteristics were not associated with adherence. Logistic regression models identified income, depression, and the total number of DMARDs as predictors of medication nonadherence.Conclusion: In this study, 62% of patients with RA were not adherent to their DMARD prescription. Education, income, depression, and the total number of DMARDs were associated with medication adherence, and income, depression, and the total number of DMARDs were independent predictors of medication adherence in patients with RA. These findings could help medical personnel develop helpful interventions to improve