When a heat transfer tube wall in a steam generator of a sodium-cooled fast reactor fails, high-pressure steam leaks into low-pressure liquid sodium side. Then the high-temperature and highly corrosive reaction jet causes secondary failures of neighboring heat transfer tubes. The objective of the present study is to develop an experimental method to obtain data that is necessary to validate and improve a safety evaluation code on the sodium?water reaction. In the present paper, the methods of sodium?...
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Development of Erosion Test Methods on Underexpanded Inert-Gas Impinging Jets Injected in Liquid Sodium

We have developed the prediction monitoring and diagnostic system for the purpose of the early detection of the abnormal behavior of the complicated system like a nuclear power plant. Furthermore, the techniques for the modeling of the relationships between sensors are applied to evaluate the system performance. The developed method is applied to the primary loop recirculation (PLR) pumps and the system performance indicator is calculated. The results are compared with the maintenance record of the PLR p...
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Application of Prediction Monitoring and Diagnostic System to Plant Performance Evaluation

It is thought that we can let knowledge of "Human" substitute by building a function to utilize predictive information, and to extract a similar example from these documents in AI. In this way, we can largely reduce a burden on "Human" by building past accidents as a database, and being resemblance or equivalence, and extracting a cormorant from that. But we may list it by expression varying among document creators even if it is the same company. When we performed a document search with disregard to such a ...
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Examination of a method to search past similar cases registered in NUCIA from predictive information detected by SIAT

System Invariant Analysis Technology, SIAT can detect abnormal behavior of plant parameters. However, the cause analysis functionality for the abnormal behavior has been strongly desired to support engineers making decisions for taking appropriate actions. For that purpose, we have developed the cause analysis functionality based on the result of the broken invariant analysis. Database of the broken invariant distribution with that cause is prepared and the similarity with the current abnormal behavior of t...
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Development of the cause analysis functionality for the abnormal behavior detected by SIAT

A place to depend on an experienced of the knowledge of operation engineer and the maintenance engineer so-called experienced engineer about plant administration is big and, in us, will entrust it to "Human" from a process of the phenomenon identification to the last judgment of the result. Because a human resource is limited, we cannot depend on "Human" for all the judgments. Therefore, about keeping a function to substitute in [Human = experienced person] in AI namely SIAT and other AI system namely IBM W...
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Advance of plant monitoring technology by cooperation of an system invariant analysis technology (SIAT) and IBM Watson Explorer

We applied NEC SIAT engine in cooperation with an NEC stock and developed the system which detected the abnormality of the plant early. This system was able to demonstrate that I could detect abnormality early by the inspection of conventional actual machine data. However, I depended on the experienced engineer about the details of the phenomenon, the cause. I applied Watson of IBM this time and developed a technique to study to the details of the phenomenon, a cause by letting you cooperate with an omen sy...
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Times New Advancement of the plant monitoring technology by the cooperation of omen monitoring system (SIAT) and Watson

１． はじめに最近10年ほどの間に原子力発電をめぐる状況は大きく変わってきた。新興国でのエネルギー需要の増大、石油・天然ガス等の将来的価格高騰に対する懸念、環境問題等が引き金となり、世界的に原子力発電を見直す国が増えるとともに、新興国による原子力発電導入の動きも活発化してきた。また、米、仏、日等の原子力先進国では自国内の原子力発電プラントの信頼性向上、稼働率向上、供用期間の延長等を図るために、広範な技術検討、研究開発、管理面での改善および安全規制の高度化が進められてきた。他方国際的には、2008年7月......

This paper describes localization and cable handling me thod as the underlying techniques for underwater surveyrobot. Map matching method comparing cross-sectional hape data cut from a 3-D CAD with structural shapesmeasured by a range sensor is proposed as the localiza tion. The cable handling system mounted to a robot isdeveloped to operate the cable remotely. Some experime nts to evaluate performance of the proposed techniqueswere implemented at mock-ups of a reactor building and he real field. As a resu...
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Development of underlying techniques for underwater survey robot to decommission nuclear power plants

After 2002, Stress Corrosion Cracking (SCC) came to be detected in the low carbon stainless steel PLR Piping of BWR plants. However, it worked on the improvement of ultrasonic examination technology for PLR Piping in Japan BWR Owners Group (JBOG) , because the mistake of the evaluation was caused as a rare case. In this study, it introduces the improvement of ultrasonic testing technology and evaluation....
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Know-How for the Ultrasonic Examination Practice & Evaluation of PLR Piping

2002, Stress Corrosion Cracking (SCC) came to be detected in the low carbon stainless steel PLR ; of BWR plants. These SCC were detected and evaluated by the Procedure for adding creeping wave ar wave of angle of 45° based on ultrasonic examination guidelines in In-service inspection (JEAG . However, it worke d on the improvement of ultrasonic examination technology for PLR Piping in BWR Owners Group (JBOG), because the mistake of the evaluation was caused as a rare case. In this it introduces the improvem...
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Know-How for the Ultrasonic Examination Practice & Evaluation of PLR Piping