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Report No.
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JOYO 75MWt Start-up test report; Temperature distribution analysis in the pedestal structure of JOYO

not registered; Yamamoto, Hisashi*; Nagai, Fumio*; not registered; not registered; not registered; not registered

The purpose of this study is to analyze the temperature distribution in the pedestal structure of JOYO whieh support the reactor vessel. The approach in this work has two steps. The first step is to estimate the heat generation rate induced by irradiation in the reaetor. The second step is to culculate the temperature distribution by using the estimated heat generation rate and the boundary condition which have been sampled from operating data of JOYO. The summary of the results are as follows ; (1)The amount of the heat generation rate in the pedestal structure by irradiation is about 140kcal/hr. (2)The temperature at upper inner surface of the pedestal structure interfaced with reactor vessel flange is higher than at lower outer part of the pedestal structure. (8)The temperature distribution in the pedestal strueture is more influenced by cooling eondition rather than by heat generation rate.

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