Evaluation of dismantling data in Fugen's decommissioning

ふげん廃止措置における解体データの評価

香田 有哉 ; 手塚 将志  ; 荒谷 健太; 南光 隆

Koda, Yuya; Tezuka, Masashi; Aratani, Kenta; Nanko, Takashi

原子力機構原子炉廃止措置研究開発センター(以下、「ふげん」)では、廃止措置計画の認可を得た2010年以降、比較的汚染レベルの低い設備であるタービン系設備の解体撤去工事を実施しながら、廃止措置の研究開発を進めている。「ふげん」は原子炉本体等の一部構造を除けばBWRと類似していることから、将来の実用炉の廃止措置に成果を反映する観点から、参考となる有用なデータを蓄積・評価することを目的とし、解体撤去工事を通じて解体工法等の確証を進めている。2014年度までに、タービン系設備のうち給水加熱器, B復水器, A復水器の一部、組み合わせ中間弁等の機器等について解体撤去を終えている。今回は従来の技術を用いた切断試験を実施し、各切断工具の適用性を評価した結果について報告する。

Decommissioning Engineering Center, which is called FUGEN, has started dismantling works based on its decommissioning program since 2008. The dismantling works was launched in turbine system whose contamination was relatively low level. Feed-water-heaters and main-steam-pipes had been dismantled already, and now, main-condensers have been dismantling. Approximately 1000 tons of dismantled waste was produced from the dismantling works so far. Dismantling work needs to be done safely and effectively with appropriate cutting devices depending on the situations that is its method, quality and shape of the materials to be dismantled. Therefore, in FUGEN, varieties of conventional cutting devices, which are thermal cutting method and mechanical cutting method, are used in the dismantling works to evaluate their applicability depending on the work situations. Obtained cutting data are summarized and evaluated in order to reflect to the following own works and other decommissioning plants.