G.A.M.I.N. And Tungsten Damage/Activation Ratio Correlations for Irradiation Effects Evaluation in Pressure Vessel Steels

摘要

Computed iron and tungsten (W) d.p.a. damage cross-sections are very similar. Recently W detectors were implemented for direct damage fluence measurement in pressure vessels (P.V.) mock-ups: TRITON (Fontenay-aux-Roses) and OAK RIDGE reactors, as well as in dosimetry rigs for standard steel irradiations: MELUSINE (Grenoble). The W detector response has been compared with calibrated graphite (G.A.M.I.N.) detectors or qualified spectrum computations. Fair agreement is obtained with d.p.a. model in standard locations. But this model must be adjusted for P.V. environment where higher damage/activation ratio are found. Consistency between both detectors shows that relative neutron damage effectiveness is enhanced below 1 MeV. Metallurgical results on irradiated steels in MELUSINE confirm conservative damage analysis by these techniques. (Atomindex citation 13:674585)