PECS - Ⅱ: A COMPUTER PROGRAM FOR THE PROBABILISTIC EVALUATION OF FUEL FAILURE CAUSED BY FISSION GAS PRESSURE

摘要

The PECS-II (Probabilistic Evaluation of Cladding Stress) computer program is described, along with instructions for its use. Monte Carlo simulation is used to calculate probability distributions for LMFBR cladding failure caused by fission gas pressure. The entire reactor core is simulated by dividing the core into groups of fuel rods with similar operating conditions. Importance' sampling is applied in order to reduce the number of Monte Carlo samples (and the cost) required for adequate estimation of low values of probability. PECS-II is operational on the Honeywell-6000 computer and the CDC-7600 computer.