Neutronics experiments on HCPB and HCLL TBM mock-ups in preparation of nuclear measurements in ITER

ITERにおける核計測の準備のためのHCPB・HCLL TBMモックアップを用いた中性子工学実験

Batistoni, P.*; Angelone, M.*; Carconi, P.*; Fischer, U.*; Fleischer, K.*; 近藤 恵太郎; Klix, A.*; Kodeli, I.*; Leichtle, D.*; Petrizzi, L.*; Pillon, M.*; Pohorecki, W.*; Sommer, M.*; Trkov, A.*; Villari, R.*

Batistoni, P.*; Angelone, M.*; Carconi, P.*; Fischer, U.*; Fleischer, K.*; Kondo, Keitaro; Klix, A.*; Kodeli, I.*; Leichtle, D.*; Petrizzi, L.*; Pillon, M.*; Pohorecki, W.*; Sommer, M.*; Trkov, A.*; Villari, R.*

EUが開発を進めているITERで試験をする2つのテストブランケットモジュール(TBM)のうち、ヘリウム冷却リチウム鉛型TBMのモックアップ体系を用いた中性子工学実験を行った。種々の測定手法を用いて体系内のトリチウム生成率分布を詳細に測定した。また、TBM実機での中性子モニタとして開発されたリチウムダイアモンド検出器によるトリチウム測定も試みた。さらに、体系内の放射化反応率分布も測定した。これらの実験データはMCNP, FENDL-2.1を用いた計算と10%程度で一致し、計算の予測精度が高いことがわかった。感度,不確定解析も行い、核データの不確かさによるトリチウム生成率の不確かさはおおむね2%以下と小さかった。

The EU is developing two test blanket modules (TBM), the Helium Cooled Pebble Bed (HCPB) and the Helium Cooled Lithium Lead (HCLL), which will be tested in ITER. Here neutronics experiments with a mockup for HCLL TBM were carried out. Detail distributions of the tritium production rate inside the mockup were measured with various methods. A lithium diamond detector developed as a neutron monitor for fusion devices has also been used as a tritium detector. Activation reaction rates inside the mockup were also measured. These measured data agreed with calculation results buy using MCNP and FENDL-2.1 within 10%, which demonstrated that the prediction accuracy was high. Sensitivity and uncertainty analyses suggested that the uncertainty of the tritium production rate from the nuclear data uncertainty was small, usually below 2%.