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Evaluation of linear heat rates for the power-to-melt tests on "JOYO" using the Monte-Carlo code "MVP"

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The linear heat rates of the power-to-melt (PTM) tests, performed with B5D-1 and B5D-2 subassemblies on the experimental fast reactor "JOYO", are evaluated with the continuous energy Monte carlo code, MVP. We can apply a whole core model to MVP, but it takes very long time for the calculation. Therefore, judging from the structure of B5D subassembly, we used the MVP code to calculate the radial distribution of linear heat rate and used the deterministic method to calculate the axial distribution. We also derived the formulas for this method. Furthermore, we evaluated the error of the linear heat rate, by evaluating the experimental error of the reactor power, the statistical error of Monte-Carlo method, the calculational model error of the deterministic method and so on. 0n the other hand, we also evaluated the burnup rate of the B5D assembly and compared with the measured value in the post-irradiation tests. The main results are following: (1)B5D-1(B5101, F613632,core center) Linear heat rate: 600W/cm$$pm$$2.2% Burnup rate: 0.977 (2)B5D-2(B5214, G80124,core center) Linear heat rate: 641W/cm$$pm$$2.2% Burnup rate: 0.886

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