Study on the Best Design of Neutron Irradiation Facility for BNCT
We have two principles for design studies; the first one is the “best design” which has no restrictions in the case of a design of a newly built reactor, and the second one is an “optimum design” which has some restrictions in the case of remodeling for some existing reactors. The first modification of the Musashi reactor was a so-called “optimum design” work1. We have already performed the neutron beam design work2 3 for an enhancement of the thermal and epithermal flux. The present study aims at the “best design” for BNCT, starting from an “optimum design”. The design criteria are as follows: (1) Ф th ≧ 3 × 109(n/cm 2 sec)for thermal beams, (2) Ф epi ≥ 1.5 × 109(n/cm 2 sec) for epithermal beams, on condition of Ф f ≦ 3 × 106 (n/cm 2 sec) and γ ≤ 150(R/h) at the reactor power of 500 KW. If we want to get the flux values for 1 MW reactor, we can easily get them by multiplying the 500 KW values by a factor of 2.
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