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The RELAP5/MOD3.2 computer program has been used to analyze a series of tests investigating void fraction distribution over height in RBMK fuel channels performed in Facility BM at the ENTEK. This is RBMK Standard Problem 7 in Joint Project 6, which is the investigation of Computer Code Validation for Transient Analysis of RBMK and VVER Reactors, between the United States and Russian Minatom International Nuclear Safety Centers. The experiment facility and data, RELAP5 nodalization, and results are shown for all tests. Agreement between RELAP5 and the experiment data is reasonable.

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Comfn&r simulation is recognized as a critic@ technolopy, playing a major role in many area.9 of national interest, such as increasing the efficiency and safety of nuclear reactors, improving the efficiency of car engines or predicting weather patterns and global climate changes. In recent years, rapid changes in computing technology have inrreased the computing power available to computer simulation $w+ofeessionak. The advent of massively parallel computers and disti'buted computing networks has accelerated this trend, which is sure to continue in the foreseeableji&ure. The development of largescale computational applications needed for the solution of practical probbms is beginning, relatizwly slowly, to take advantage of available parallel computing technology. A.M.