Evaluation of control rod interaction measurement in the prototype fast reactor Monju

高速増殖原型炉「もんじゅ」における制御棒干渉効果測定の評価

大釜 和也   ; 羽様 平 ; 片桐 寛樹; 竹越 淳*

Ohgama, Kazuya; Hazama, Taira; Katagiri, Hiroki; Takegoshi, Atsushi*

For evaluating control rod (CR) interaction, CR worth with and without insertion of interaction CRs were measured in six CR interaction patterns by the continuous period method and the compensation method in the prototype fast breeder reactor Monju. The measured CR worth was evaluated in detail by conducting corrections such as thermal contraction of CR drive shafts and compared with calculations to examine the reliability; Calculation-to-experiment values (C/Es) of examined CR worth with and without the interaction were 0.96-0.980.03. Values of measured CR interaction were obtained from those examined CR worth measurements as a change in target control rod worth by insertion of interaction CRs: 5.00.6% - 10.10.1%. C/Es of interaction in those cases were 0.78-0.93 within 5-27% uncertainty. Through this study, the consistency and reliability of the measurements and the calculations of the CR interaction were confirmed, and the measurements were judged useful.