Stochastic simulation of fission product activity in primary coolant due to fuel rod failures in typical PWRs under power transients

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• 作者：M. Javed Iqbal ; Nasir M. Mirza ; Sik ; er M. Mirza
• 关键词：Liquid alloys and liquid metals ; X-ray diffraction
• 刊名：Journal of Nuclear Materials
• 出版年：2008
• 期刊代码：51_00223115
• 类别：ms
• 出版时间：15 January 2008
• 卷：372
• 期：1
• 页码：132-140
• 文件大小：335 K

摘要

During normal operation of PWRs, routine fuel rods failures result in release of radioactive fission products (RFPs) in the primary coolant of PWRs. In this work, a stochastic model has been developed for simulation of failure time sequences and release rates for the estimation of fission product activity in primary coolant of a typical PWR under power perturbations. In the first part, a stochastic approach is developed, based on generation of fuel failure event sequences by sampling the time dependent intensity functions. Then a three-stage model based deterministic methodology of the FPCART code has been extended to include failure sequences and random release rates in a computer code FPCART-ST, which uses state-of-the-art LEOPARD and ODMUG codes as its subroutines. The value of the ¹³¹I activity in primary coolant predicted by FPCART-ST code has been found in good agreement with the corresponding values measured at ANGRA-1 nuclear power plant. The predictions of FPCART-ST code with constant release option have also been found to have good agreement with corresponding experimental values for time dependent ¹³⁵I, ¹³⁵Xe and ⁸⁹Kr concentrations in primary coolant measured during EDITHMOX-1 experiments.