Non-destructive testing technique was developed for embedded hardware using acoustic emission sensors. In this technique, AE sensor records the acoustic vibration generated by striking the embedded hardware with a hammer. The fixed state of the embedded hardware is judged from the vibration time of the embedded hardware recorded by the AE sensor and the frequency distribution of the acoustic signal. Mockup tests and FEM analysis were carried out in order to verify the effectiveness of the technique....
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Embedded hardware inspection using AE sensor Part1 Mockup tests

Non-destructive testing technique was developed for embedded hardware using acoustic emission sensors. In this technique, the fixed state of the embedded hardware can be judged from the vibration time and the frequency distribution of the acoustic signal. In this report, we introduce inspection method and analysis method at site and the application result of JNFL by nondestructive inspection technology of embedded hardware using AE sensor....
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Embedded hardware inspection using AE sensor Part2 Site inspection

The maintenance of valves used in nuclear facilities (check valves, ball valves, gate valves, butterfly valves, etc.) is carried out by daily checking and overhaul. However, it is not easy to diagnose the inside status of these valves such as open-close performance and internal leakage. In this report, our approaches are shown to develop valve diagnosis by acoustic measurement using AE (Acoustic Emission) sensor through test loop examinations and the field applications....
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Development of valve diagnosis using AE sensor

Nuclear power plants have been restarted, and trials on driving injunctions are being made in some places in Japan. As in the case of responding to Pyroclastic flow, the recent issue has shifted from the academic task to the inter-discipline problem between science and society, such as matching risk recognition with society. In the paper, we would like to explain the discussion points and find out the direction of solution by looking at some experiences and achievements in the areas other than nuclear secto...
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Nuclear Power Trials, Issue and Arguments -To reduce risk of lawsuit-

Nuclear power plants have been restarted, and trials on driving injunctions are being made in some places in Japan. As in the case of responding to Pyroclastic flow, the recent issue has shifted from the academic task to the inter-discipline problem between science and society, such as matching risk recognition with society. In the paper, we would like to explain the discussion points and find out the direction of solution by consolidating the opinions of law experts and experts in nuclear technology....
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Nuclear Power Trials, Issue and Arguments -Why was a nuclear power plant stopped-

原発の運転差し止め裁判の課題を調査してきた。裁判では、原子力規制委員会が認めた審査の合格に 反論し、運転の差し止めを請求する訴訟が多発し、判決は様々な判断を示している。本検討会では、何が技術的課題なのかを明確にして、裁判で説明しきていない技術的論点について、正論を示すことを 狙って活動している。本報告では原発の再稼働が裁判で争われる構図を概観し、そこに含まれる問題 点について報告したい。 We have investigated the issue of the nuclear power plant injunction trial. The court may have argued against the “passed examination” conclusion accepted by the NRA. Many lawsuits have been filed to stop the operation of nuclear power plants. Judgments in court show various decisions. In this study group, we a...
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Nuclear Power Trials, Issue and Arguments No.1 Technical Issue - External Events-

原発の運転差し止め裁判の課題を調査してきた。裁判では、原子力規制委員会が認めた審査の合格に反論し、運転の差し止めを請求する訴訟が多発し、判決は様々な判断を示している。本検討会では、何 が技術的課題なのかを明確にして、裁判で説明しきていない技術的論点について、正論を示すことを 狙って活動している。本報告では、特に外的事象、自然災害を対象に、どのような判断が示され、そこにどのような論点があるのか明確にした。 We have investigated the issue of the nuclear power plant injunction trial. The court may have argued against the “passed examination” conclusion accepted by the NRA. Many lawsuits have been filed to stop the operation of nuclear power plants. Judgments in court show various decisions. In this study group,...
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Nuclear Power Trials, Issue and Arguments No.2 Technical Issue - External Events-

Non-destructive testing technique was developed for embedded plates using phased-array ultrasonic testing (PAUT). The bending angle of their studs was quantitatively estimated by using the sector scan of PAUT, which is usually difficult by using conventional UT. In addition, this technique is capable of visualizing the weld shape of the stud by using the linear scan of PAUT. Mockup tests were carried out in order to verify the effectiveness of the technique....
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Development of Testing Technique on Embedded Plates Using Phased-Array Ultrasonic Testing

In the event of a general disaster or a nuclear disaster, the government will make announcements such as evacuation advisories and evacuation orders when there is a possibility that a crisis will occur to the general public. They take evacuation action to avoid damage based on the instructions. The issue here is that the significance of evacuation instructions applied to general disasters and nuclear disasters in terms of crisis management may be different for each disaster. Therefore, in this paper, the is...
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Crisis Management Issues by Comparing Natural Disasters and Nuclear Disasters

In Japan many people suffer from the event of natural disasters (typhoon,earthquake,tsunami,eruption,etc). There are two types in natural disasters, predictable disaster and unpredictable disaster. Typhoon is predictable disaster. On the other hand, earthquake is unpredictable disaster. In the predictable disaster cases like typhoon, the best choice is to go to the evacuation facility quickly. But many people don’t go to the evacuation facility, stay in their house. This is the reason why many people die in...
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Crisis Management Issues on Natural Disasters