JRR-4 反射体要素の割れ事象の発生及び今後の保全
英字タイトル:
Investigation of the Crack in a Reflector Element of JRR-4 and Future Maintenance
著者:
坂田 茉美 Mami SAKATA 八木 理公 Masahiro YAGI 堀口 洋徳 Hironori HORIGUCHI 平根 伸彦 Nobuhiko HIRANE
発刊日:
公開日:
GraphiteIrradiation GrowthJRR-4Radiographic TestingReflectorResearch Reactor
Investigation of the Crack in a Reflector Element of JRR-4 and Future Maintenance
著者:
坂田 茉美 Mami SAKATA 八木 理公 Masahiro YAGI 堀口 洋徳 Hironori HORIGUCHI 平根 伸彦 Nobuhiko HIRANE
発刊日:
公開日:
カテゴリ: 第6回
キーワードタグ:GraphiteIrradiation GrowthJRR-4Radiographic TestingReflectorResearch Reactor
概要
A crack was found on a weld area of one reflector element in JRR-4 on December 28, 2007. The following examinations were carried out, visual examination, dimensional examination, fract ography examination and so on. It was concluded that the main cause of the crack is the neutron-induced swelling of graphite in the reflector element. We tested radiographycally the oth er reflector elements. As the result, we determined that many of them were not in a suitable state to be used because of swelling of graphite. Based on the relation between the irradia tion dose and swelling rate, the design of the new reflector elements has been carried out. We decided to test radiographycally all the new reflector elements as the future maintenance.
