Technical Report. Development of In-core Monitor Housing Replacement Technology.

DOI Web Site 3 References

Bibliographic Information

Other Title
  • 中性子計測ハウジング取替工法の開発
  • チュウセイシ ケイソク ハウジング トリカエ コウホウ ノ カイハツ

Search this article

Abstract

Replacement technology of in-core monitor (ICM) housing of BWR was developed and applied in the operating Plant. This technology replaces stress corrosion cracking (SCC) susceptible existing ICM housing by new housing composed of SCC resistant material. Major procedure steps are removal of the existing ICM housing, welding and trimming of a new weld buildup, welding of a new ICM housing, and joint of a new ICM guide tube with the ICM housing using shape memory alloy couplings. Each procedure step is performed remotely with automated tools, which are installed from the reactor refueling floor, 26m down to the Reactor Pressure Vessel bottom, through core plate etc. After several years of development, this technology was applied to an ICM housing of Fukushima Daiich Unit #4 where a crack caused by SCC was found on October 1997. and site work was successfully completed in the end of January 1998.

Journal

References(3)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top