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Prediction of performance of Safety Injection Tank with Fluidic Device using a model of two flow paths and its effect on LBLOCA

机译:使用两个流路模型预测带流体装置的安全注射罐的性能及其对LBLOCA的影响

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To predict the performance of the Safety Injection Tank (SIT) with Fluidic Device (FD) of APR1400 (Advance Power Reactor 1400) and its effect on Large Break Loss-of-Coolant Accident (LBLOCA) of APR1400, a model using two flow paths within the SIT is developed such that a flow path along the stand-pipe and a flow path through the connecting holes to mixing chamber of the FD can be simulated. A method to determine the hydraulic resistance of each flow path based on the hydrodynamic consideration is also developed. Since the method requires overall K-factor during high SIT flow phase and one during low SIT flow phase, the similarity of the hydrodynamics along the initial SIT pressure is evaluated assuming a simple isentropic process. The transition in those hydraulic resistances from the high flow phase to low flow phase are also considered in terms of IC-factor of each flow path. From the course of estimating the overall IC-factors, the modeling uncertainties are estimated. A good agreement with the test data and validity of the estimated uncertainty range are found from the calculation of the actual test using MARS-KS code and the present modeling. A LBLOCA of APR1400 plant is calculated using the present modeling scheme and the uncertainties of hydraulic resistance. Effect of nitrogen on cladding thermal response is discussed. (C) 2017 Elsevier Ltd. All rights reserved.
机译:为了预测带有APR1400(Advance Power Reactor 1400)的流体装置(FD)的安全注入箱(SIT)的性能及其对APR1400的大破口冷却液损失事故(LBLOCA)的影响,该模型使用两个流路在SIT中进行开发,可以模拟沿竖管的流动路径和通过连接孔至FD混合室的流动路径。还开发了一种基于流体动力学考虑因素确定每个流路水力阻力的方法。由于该方法在高SIT流动阶段需要整体K因子,而在SIT较低流动阶段则需要K因子,因此假设简单的等熵过程,将评估沿初始SIT压力的流体动力学相似性。这些水力阻力从高流动相到低流动相的过渡也要根据每个流路的IC系数来考虑。从估算总体IC因子的过程中,可以估算出建模不确定性。通过使用MARS-KS代码和本模型对实际测试进行计算,可以找到与测试数据和估计不确定性范围的有效性的良好一致性。使用当前的建模方案和水力阻力的不确定性来计算APR1400工厂的LBLOCA。讨论了氮对熔覆热响应的影响。 (C)2017 Elsevier Ltd.保留所有权利。

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