The development of MONJU plant dynamics analysis code(5); The development of A/C analysis model

Miyakawa, Akira ; not registered

In Monju, in order to evaluate a plant thermal behavior with sufficient accuracy, the analysis code has been improved according to the data acquired by SKS and SST which were carried out before. Here, the main purpose is improvement of the air cooler model which is the important component which remove the decay hot at the time of a trip. In order to improve, input data of air cooler model was arranged using data measured by the plant trip test. The result is as follows. First, data of the air cooler the outlet Na temperature obtained by the plant trip test was arranged, and it compared with the result of the analysis carried out conventionally. After plant trip, the vane was completely open about 10 minutes. During this period it was found that the outlet Na temperature of an analysis exceeds that of the test. In order to examine the cause of this difference, we investigated using examination results, such as the inlet Na temperature and Na flow rate of an air cooler, and compared the examination result and the calculation result. As a result, the amount of heat exchange found to be calculate little than the actual value. Performance data of an air cooler blower was adjusted according to this result. Consequently, the analysis result has been improved. However, when a vane is controlled and the half-opening state, the outlet Na temperature of an analysis result came to be less than the examination result. This reason is that the flow rate of air in a half-opening state is estimated more than the actual value. By the cause, it is considered to have calculated greatly the amount of heat exchange of an air cooler. Reflecting this result, to reduce the flow rate of air, the pressure loss coefficient of the vane was change to be high so that the amount of heat exchange might become small. Input data was corrected as the above-mentioned. The air cooler model has been improved compared with the result before adjustment. As a result, close agreement between the analysis ...