Investigation on integrity of JMTR concrete structures, cooling system and utility facilities

JMTRコンクリート構造物、冷却系設備及びユーティリティ設備の健全性調査

海老沢 博幸; 飛田 健治; 深作 秋富; 神永 雅紀  

Ebisawa, Hiroyuki; Tobita, Kenji; Fukasaku, Akitomi; Kaminaga, Masanori

2011年から再稼働するJMTRで継続して使用する機器や設備の健全性を、機器の更新に先立ち調査した。2007年度当初に、JMTR原子炉建家,排気筒,トレンチ,カナル,フィルターバンクのコンクリート構造物,1次冷却系のタンク類,熱交換器,2次冷却系配管,非常用発電機等の健全性を確認するための経年劣化調査を実施した。その結果に基づき、排気筒やUCL高架水槽基礎部等のひび割れは補修し、2次冷却系配管のライニングは更新した。その他の機器や原子炉建家は、長期保全計画に従った適切な保守により継続的に使用することが確認された。本稿では、JMTR原子炉建家,熱交換器及び非常用発電機の健全性調査結果について示す。

The condition of facilities and components to be used for re-operation of the Japan Materials Testing Reactor (JMTR) from FY2011, was investigated before the refurbishment work. An investigation of aged components (aged-investigation) was carried out for concrete structures of the JMTR reactor building, exhaust stack, trench, canal, filter banks and for aged components of tanks in the primary cooling system, heat exchangers, pipes in the secondary cooling system, cooling tower, emergency generators and so on, in order to identify their integrity. The aged-investigation was carried out from the beginning of FY2007. As a result, cracks of concrete structures such as the exhaust stack, a foundation of the UCL (Utility Cooling Line) elevated water tank were repaired and pipe linings of secondary cooling system were replaced. Motors of primary cooling pumps, pumps in the secondary cooling system and in other systems were decided to replace from viewpoints of future maintenance and improvement of reliability. Other components and the reactor building were decided to use continuously for a long-term by appropriate maintenance activities based on the long-term maintenance plan. In this paper, the aged-investigation for the JMTR reactor building, heat exchangers and emergency generators is presented.