Verification of corrosion product behavior analysis code for prediction for JOYO MK-II and Monju reactors

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PNC TJ902 85-06, 549 Pages, 1985/06

PNC-TJ902-85-06.pdf:11.47MB

An analysis of the corrosion product behavior in the coolant system of the experimental fast breeder reactor JOYO was performed in order to verify an accuracy of the corrosion product behavior analysis code PSYCHE, and to confirm an applicability of parameters obtained from the in-loop-experiments. The PSYCHE code was also applied to predict the corrosion product behavior in scheduled JOYO operation condition and in scheculed MONJU, the prototype fast breeder reactor, operation condition. The PSYCHE code is based on a solution-precipitation model and the verification was performed by comparing the CP deposition density and dose rate of the primary sodium pipings between calculation and measurement. The comparison leads to the results that calculated deposition density agrees with the measurement within factors of 0.5 to 1.2 for Mn and within factors of 0.4 to 2.1 for Co, and that the calculated dose rates agree with the measurement within an error of 20-30%. The primary results derived from the analysis of the JOYO MK-II up to the 17-th full power cycle (Apr. '88) are that the released CP inventory would be gradually increased and be about 3.6 times higher for Mn and about 5.0 times higher for Co than those at the 4-th annual inspection (Jan. '84) and, according to this release increasement, dose rates around the primary pipings would reach 100 to 200 mR/h and at the maximum reach 400 mR/h at the nozzle of the IHX. From the analysis of MONJU up to the 57-th full power cycle, it is expected that the release inventory is about 780Ci for Mn, 470Ci for Co, 140Ci for Cr and 50Ci for Co at 10 days after reactor shutdown. Dose rates in the primary heat transport system vault are expected to reach about 1100 mR/h at the nozzle of the IHX and about 50 mR/h at a point 2m from the primary piping. It is predicted that Mn, Co and Cr behavior is determined during the first 5 cycles and ...