"JOYO" Start-up test report; Performence of Normal operational conditions PT-51 operational performance in miscellaneous systems (PART-I)

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Heat load for nitrogen atmosphere cooling system at reactor power of 50MW was proved to be corresponding to the design value of approximately 4.1 10 Kcal/n which was estimated at the reactor power of 100MW. This report describes the predicted heat loads of the reactor power of 75MW and 100MW, possibility of ability to cool nitrogen atmosphere being increased and performance of the nitrogen atmosphere cooling system. They were obtained with results of dual operation of heat exchangers and refrigirators which was carried out to survey the possibility of ability to cool the nitrogen atmosphere being increased. (1)Predicted heat load at the reactor power of 75MW and 100MW Increasing rates of the heat load against the design value were as follows: [75 MW : approximately 6%] [100 MW : approximately 15%] (2)Possibility of ability to cool the nitrogen atmosphere being increased It is possible to lower a mean temperature of the nitrogen atmosphere with the dual operation of the heat exchangers, which however requires dual operations of the refrigirators and freon circulating pumps. (3)Performance of the nitrogen atmosphere cooling system Overall heat transfer coefficient of the heat exchangers satified its design value, however heat exchanger outlet nitrogen gas temperature was approximately 3C higher than its design value. This discrepancy of 3C was considered as the evapolation temperature of freon did not satisfy the deaign temperature.