Reactor physics study related to subcriticality of accelerator driven system by AESJ/JAERI working party

Under the Research Committee on Reactor Physics of Atomic Energy Society of Japan (AESJ) and Japan Atomic Energy Research Institute (JAERI), a Working Party on Reactor Physics of Accelerator-Driven System (ADS-WP) has been set since March 1999 to review and investigate special subjects related to reactor physics research of Accelerator Driven System (ADS). In the ADS-WP, the extensive and aggressive activities are being made by 25 professional members in the field of reactor physics in Japan. The ADS is now studying three subjects related to subcriticality of ADS; (1) calculation accuracy of subcriticality on ADS, (2) critical safety issues of ADS, and (3) theoretical review of subcriticality and its measurement methods. The ADS-WP will continue until March 2003 and the activity for all three subjects is being in progress. This summary describes a benchmark problem based on experiments by three critical assemblies in Japan. This topic is related to the subject (1), however, in the conference, I will present the topics related to other two subjects (2) and (3). (author)