Additional monitoring is occasionally done on suspicious equipment such as pumps, motors, valves and so on, when monitoring parameters are different from normal operation in Nuclear Power Plant If the suspicio us equipment is located in high radiation area, it is hard to arrange for the additional monitoring So, wireless data transmission system is desired And maintenance persons desire to watch the additional moni toring data in their office on P C We can enable to transfer the desired live data from ...
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DATA transmission by 2.4GHz radio frequency and LANfrom Nuclear Power Plant to office

Additional monitoring is occasionally done on suspicious equipment such as pumps, motors, valves and so on, when monitoring parameters are dif ferent from normal operation in Nuclear Power Plant. To avoid excess radiation exposure during arrangements for the additional monitoring requ iring sensors installation and cables layout, wireless data transmission system is desired. ZigBee system, which uses 2.4GHz radio frequency a nd has repeating function, is suitable for the needs above without influencing on ...
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Study on DATA transmission by 2.4GHz radio frequency in Nuclear Power Plant

Operators must open or close a lot of HCU valves in a short time during periodical inspection on BWR Nuclear Power Plant. On H amaoka NPP, the HCU valves are operated by special handling tools. But the tools are not exactly appropriate for operating the HCU valves. So, many operators feel tough, when they operate the HCU valves.In order to reduce their feeling of toughness, the handling tools have been improved by producing prototypes, examining the touch by mock-up unit, testing durability and so on....
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Improvement on handling tool for HCU valveIRA

1.緒言 浜岡原子力発電所では、従来よりプロペラ型および超音波型の風向風速計にて、排気筒高さの風向風速観測を行っている。 近年、レーザー光を用いたドップラーライダでの気象観測が実施されるようになってきており、原子力関連施設においてもドップラーライダにて風向風速観測が実施され、気象観測指針で要求される性能を有していることが確認されている[1]。 ドップラーライダは小型・軽量であり、また、本体を地上面に設置することが可能であることから保守性にも優れている。その一方、空中のエアロゾルで散乱されたレーザー光を受信......
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Wind field observation by Doppler Lidar at Hamaoka NPP

Abstract In order to reduce the time for core verification or visual inspection of BWR fuels, the underwater camera using a High- Definition camera has been developed. As a result of this development, the underwater camera has 2 lights and 370×400×328mm dimen sions and 20.5kg weight, Using the camera, 6 or so spent-fuel IDs are identified at lor 1.5m distance at a time, and 0.3mm $ pin-h ole is recognized at 1.5m distance and 20 times zoom-up. Noises caused by radiation less than 15Gy/h are not affected th...
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Development of underwater camera using High-Definition camea

Muon radiography is one of the remote sensing technologies, and it has been used at Fukushima Daiichi NPP to understand the status of the fuel inside the reactor. Nuclear Emulsion is one of the detectors used for muon radiography. Its features are light weight, compact size, no power supply required, high position resolution, and suitable for installation in a limited space. So far, at the Hamaoka NPP, from the floor on the second underground level and the sub-drain in the building-outdoor part, observation...
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Measurement of lower part of PCV of Hamaoka NPP with nuclear emulsion (Part2)

A scientifically correct understanding of the nature of ionizing radiation and its impact on the health has become more and more important after the accident at the Fukushima nuclear power plant due to the Great East Japan Earthquake that occurred on March 11, 2011. We studied fabrication and effective usage of diffusion cloud chamber for general public. It was found that especially the shielding effect for various radiations shown by our cloud chamber is very effective for comprehensive understanding ...
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The Study of a Usage of Diffusion Cloud Chamber for Understanding of Ionizing Radiation

Abstract. A scientifically correct understanding of the nature of ionizing radiation and its impact on the health has become more and more important after the accident at the Fukushima nuclear ower plant due to the Great East Japan Earthquake that occurred on March 11, 2011. We have developed the diffusion cloud chamber with the function of insertion and extraction of both a radiat ion source and a shield material independently. We demonstrated the observation of the tracks of various shape generated by al...
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The Study of a Usage of Diffusion Cloud Chamber for Understanding of Ionizing Radiation (2)

The purpose of this study is to develop underwater High-Definition camera for the confirmation test of core configuration and visual examination of BWR f uels in order to reduce the time of these tests and total cost regarding to purchase and maintenance. The prototype model of the camera was developed and examined in real use condition in spent fuel pool at HAMAOKA-2 and 4. The examination showed that the ability of prototype model was either equaling or surpassing to conventional product expect for resi...
英字タイトル:
Development of underwater High-Definition camera for the confirmation test of core configuration andvisual examination of BWR fuel