RELAP5/MOD3.2 analysis of INSC standard problem INSCSP - R7 : void fraction distribution over RBMK fuel channel height for experiments performed in the ENTEK BM test facility.

Abstract

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.

Investigation of CTF void fraction prediction by ENTEK BM experiment data

“…As mentioned in [6], Figure 1 provides a vertical and cross-section view of the test section which is also called as Heated Release Zone (HRZ). For the cross section view, the diameters are shown in millimeters.…”

“…The report [6] presents 25 tests together with RELAP5 calculation results. Since the input parameters such as pressure, mass flow rate, power and temperature are somehow not consistent with behavior of a flow because they are not measured at the same time in 10 locations along the channel in test section but are measured in sequence during the test, then to simulate these test it is need to setup base case for simulation and to perform sensitivity analysis.…”

“…The second is minimum voiding case by selection of minimum pressure, mass flow rate and maximum power, temperature. For remaining tests, the experiment data can be found in [6] and the settings base case and sensitivity cases are similar to Table I.…”