Preliminary study of the criticality monitoring method based on the simulation for the activity ratio of short half-life noble-gas fission products from fuel debris

Riyana, E. S.; Okumura, Keisuke; Sakamoto, Masahiro; Matsumura, Taichi; Terashima, Kenichi; Kanno, Ikuo

Journal of Nuclear Science and Technology, 61(2), p.269 - 276, 2024/02

https://doi.org/10.1080/00223131.2023.2300773

Activity report of Working Party on Reactor Physics of Accelerator-driven System; July 1999 to March 2001

Research Committee on Reactor Physics

JAERI-Review 2001-047, 180 Pages, 2002/02

JAERI-Review-2001-047.pdf:10.03MB

Under the Research Committee on Reactor Physics, the Working Party on Reactor Physics of Accelerator-Driven System (ADS-WP) was set in July 1999 to review and investigate special subjects related to reactor physics research for the Accelerator-Driven Subcritical System (ADS).The ADS-WP, at the first meeting, discussed a task guideline of its activity for two years and decided to concentrate upon three subjects: (1) neutron transport calculations in high energy range, (2) static and kinetic (safety-related) characteristics of subcritical system, and (3) system design including ADS concepts and elemental technology developments required.The activity of ADS-WP continued from July 1999 to March 2001. In this duration, the members of ADS-WP met together four times and discussed the above subjects. In addition, the ADS-WP conducted a questionnaire on requests and proposals for the plan of Transmutation Physics Experimental Facility in the High-Intensity Proton Accelerator Project, which is a joint project between JAERI and KEK (High Energy Accelerator Research Organization).This report summarizes the results obtained by the above ADS-WP activity. The report will be useful to overview those results and moreover to set up a new guideline of future research activity in this field.

The Preliminary edition of nuclear criticality safety handbook of Japan, 3; Calculation of criticality conditions

Komuro, Yuichi; Katakura, Junichi

Proc.Int.Seminar on Nuclear Criticality Safety, p.145 - 149, 1987/00

no abstracts in English

Study on the criticality monitoring method by measurements of short-half-life noble-gas fission products for the criticality monitoring of fuel debris inside a primary containment vessel of Fukushima Daiichi Nuclear Power Stations

Riyana, E. S.; Sakamoto, Masahiro; Matsumura, Taichi; Terashima, Kenichi; Okumura, Keisuke

no journal, , 

Evaluation of criticality safety measures for fuel storage of critical assemblies in STACY

Ishii, Junichi; Izawa, Kazuhiko; Okubo, Takuya; Ogawa, Kazuhiko

no journal, , 

For compliance with the new regulatory requirements in Japan, the Static Critical Experiment Facility (STACY) has been remodeling the existing fuel storages. In the remodeling, the existing fuel storage spaces, to which shape and dimension management are applied, are designed to add a neutron absorber for the critical control, taking into account the case of shape and dimension collapse. In order to confirm the validity of the criticality safety design, subcritical calculations were performed. In the calculations, the Japanese Evaluated Nuclear Data Library, JENDL-3.2, was used to cross reference the data. The neutron multiplication factor was calculated using a continuous-energy Monte Carlo code, MVP, and PIJ code in the SRAC code system. It has been confirmed from the results that all fuel storages comply with the safety criteria required to ensure subcriticality.