Calculation of nuclear core parameters for HTTR; Report of summer holiday practical training 2021

Isogawa, Hiroki*; Naoi, Motomasa*; Yamasaki, Seiji*; Ho, H. Q. ; Katayama, Kazunari*; Matsuura, Hideaki*; Fujimoto, Nozomu*; Ishitsuka, Etsuo

As a summer holiday practical training 2021, the impact of 10 years long-term shutdown on critical control rod position of the HTTR and the delayed neutron fraction ( $_{rm eff}$ ) of the VHTRC-1 core were investigated using Monte-Carlo MVP code. As a result, a long-term shutdown of 10 years caused the critical control rods of the HTTR to withdraw about 4.00.8 cm compared to 3.9 cm in the experiment. The change in critical control rods position of the HTTR is due to the change of some fission products such as $^{241}$ Pu, $^{241}$ Am, $^{147}$ Pm, $^{147}$ Sm, $^{155}$ Gd. Regarding the $_{rm eff}$ calculation of the VHTRC-1 core, the $_{rm eff}$ value is underestimate of about 10% in comparison with the experiment value.

Language	:	Japanese
Report No.	:	JAEA-Technology 2022-015
Pages	:	18 Pages
Publication Year/Month	:	2022/07
Patent information	:
PDF	:	JAEA-Technology-2022-015.pdf:1.37MB
Paper URL	:	https://doi.org/10.11484/jaea-technology-2022-015
Keywords	:	HTTR Core Calculation; MVP-BURN; Critical Control Rod Position; VHTRC; Delayed Neutron fraction
Research Facility	:	HTTR(高温工学試験研究炉)
Press Release	:
Article of JAEA R&D Review	:
Cooperating Institute	:
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Registration No. : TN20220015
JAEA Abstracts No. : 50000790

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