Stress corrosion cracking of welding portion has found in many domestic and foreign BWR reactor internals and Primary Loop Recirculation piping. Also, repair and preventive maintenance technologies for SCC has been developed and/or adopted to BWRs in recent years. This paper introduces the sample of these technologies, such as seal-welding fo r SCC on BWR reactor internals, preventive maintenance technology for PLR piping such as Corrosion Resistant Cladding, Internal Polishing and Induction Heating Stress...
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Repair and Preventive maintenance Technology for BWR Reactor Internals and Piping

A Ni-base alloy weld, including cracks due to stress corrosion cracking found in the reactor internal of the oldest BWR in Japan, Tsuruga unit 1, in 1999, was examined by three (3) types of UT method. After this examination, a depth of each crack was confirmed by carrying out a little excavation with a grinder and PT examination by turns until each crack disappeared. Then, the depth measured by the former method was compared with the one measured by the latter method. In this fashion, performances of...
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Evaluation on Ultrasonic Examination Methods applied to Ni-base Alloy Weld including Cracks due to Stress Corrosion Cracking found in BWR Reactor Internal

To establish the sustainable community in Japan, formation of Japanese consensus-building model for HLW g eological disposal site determination is one of key issues. In our project, we have reviewed the past his tory for HLW geological disposal site determination and propose next-generation Japanese consensus-buildin g model which is based on the discussion not only with government and specialists but also with citizens....
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Formulation of Japanese Consensus-building Model for HLW GeologicalDisposal Site Determination

Present project consists of two parts, model for institution desi gn and education program. For the education program for public ci tizen, we have developed a game running on iPod touch based on Ere hwon repository project proposed by Swiss ITC under OBRA project....
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Formulation of Japanese Consensus-building Model for HLW GeologicalDisposal Site Determination 2. Development of game for enhancement of social acceptance

To establish the sustainable community in Japan, formation of Japanese social consensus-building model for HLW geological disposal si te determination is one of key issues. In our project team of faculty of education, we found interesting middle school digital conten ts for HLW disposal site determination in London. We have been translating all of the digital contents for HLW disposal site determi nation into Japanese and we have been discussing on the model for next-generation Japanese consensus-building ...
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Formulation of Japanese Consensus-building Model for HLW GeologicalDisposal Site Determination 3. Development of Digital Contents on Social Consensus-building at Educational Institution

Investigation has been made to discusss how the accurate scientific information affects the perception of risk. To verify this investigation, dialogue seminars have been held. Based upon the outcomes of the se investigations, the analysis of attribution was done to verify the factors affecting the risk perce ption and acceptance relevant to the concensus-building for HLW geological disposal site determination....
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Formulation of Japanese Consensus-building Model for HLW Geological Disposal Site Determination 4. The Influence of the Accurate Information on the Decision making.

In this article, we have examined the background of HLW issue itself, local society and political system after discussing with various researchers who had each specialism, and w e found a new concept included “communication design” and “infulencer”. Utilizing this c oncept, we propose the whole design of next-generation Japanese consensus-building model. ...
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Formulation of Japanese Consensus-building Model for HLW Geological Disposal Site Determination 5. The whole design of Japanese consensus-building model.

Electronic Journal of Advanced Maintenance (EJAM) ha s been issued on the website of Japan Society of Mai ntenology (JSM) on May 25th, 2009 This report introd uces EJAM website structure and Editorial Operation....
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Introduction of Electronic Journal of Advanced Maintenance Website Structure and Editorial Operation

In Hamaoka Power Station, thinning management of piping system is considering earthquake In Hamaoka Power Station, thinning management of piping system is considering earthq uake resistance. Current management method is too conservative due to assumption that has large range thinning by liquid droplet impingement erosion (LDI). Therefore, we are developing reasonable earthquake safety evaluation method suited for locally-thinning caused by LDI. To understand the influence on earthquake resistance by the lo...
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Seismic safety evaluation of piping system with local wall thinning by LDI(Part1)- Thinning Management of piping system in Hamaoka Power Station

For seismic safety of piping system with local thinning surface by liquid droplet impingement erosion (LDI), hybrid tests?? were conducted to the piping with locally-thinned elbow. I n this presentation, determination method of the thinning shape on the elbow is developed.To determine the thinning shape by LDI, droplet behavior at the elbow is calculated in vario us flow and piping size conditions, and collision point and velocity for each droplet is evaluated. Then, the relationship between collision cond...
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Seismic safety evaluation of piping system with local wall thinning by LDI (Part 2)-Evaluation of local thinning shape by LDI