第2次1MW蒸気発生器試験試験報告書 : 運転経過及び洗浄解体検査

Second phase test of the 1MW steam generator; Progress of operation, dismantling and cleaning

山田 栄吉*; 森本 誠*; 市川 栄司*; 川真田 和雄*; 保田 仁司*; 黒羽 光男; 亀井 広一*

not registered; Morimoto, Makoto*; not registered; not registered; not registered; Kuroha, Mitsuo; not registered

期間1974.71977.6▲目的改造後の1MW蒸気発生器試験装置の運転経過及び運転終了後の解体洗浄の経過と外観検査等について概要をまとめ今後の参考に供する。▲要旨1MW蒸気発生器は1次試験終了の後,改造を行い,1973年2月から2次試験に入り1975年6月に全ての試験を完了の後,解体洗浄の上,構造材の外観検査を行った。▲本報告書では,2次試験における運転経過及びその間に実施した補修工事について概要を解体工事及び洗浄工事について詳細を述べ,更に解体検査について写真を含む説明を加えた。▲2次試験及びその後の工事,検査などで明らかにされた事項は下記に要約される。▲1)1次試験の結果に基づく改造が,蒸気発生器の性能改善に有効であった。▲2)水蒸気とアルゴンの混合ガスによる洗浄が,安全でかつ効果的であることが実証された。▲3)解体後の外観検査では,問題とする程ではないが,変形が観察され,コイル支持部では,伝熱管のフレッティングウエアと思われる摩耗痕が観察された。▲

After finishing first phase test, the 1MW Steam Generator was modified and second phase test was started from February 1973 and finished the test by June 1975. Then the steam Generator was dismantled, cleaned, and structural materials of the steam generator were externally inspected. This is to report the progress of operation of second phase test, repairing of facility and to describe the details of dismantling and cleaning of the steam generator addng the explanations of external inspection with photographs. Items clarified by the second phase test, followed by dismantling and cleaning were as follows : (1)Modifications based on the first phase test results were effective to improve the performance of the steam generator. (2)It was demonstrated that the cleaning of steam generator by flushing mixture of steam and argon gases was safe and effective. (3)During the external inspection after dismantling, they were observed slight deformations, and in way of the tube supports, wearing of tubes, which was supposed to be caused by fretting, was also observed.