Simulation of a small cold-leg-break experiment at the PMK-2 test facility using the RELAP5 and ATHLET codes

Journal Article · Thu May 01 00:00:00 EDT 1997 · Nuclear Technology

OSTI ID:477301

Ezsoel, G; Guba, A; Perneczky, L ^[1]; Krepper, E; Prasser, H M; Schaefer, F

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1. KFKI Atomic Energy Research Inst., Budapest (Hungary)

Results of a small-break loss-of-coolant accident experiment, conducted on the PMK-2 integral-type test facility are presented. The experiment simulated a 1% break in the cold leg of a VVER-440-type reactor. The main phenomena of the experiment are discussed, and in the case of selected events, a more detailed interpretation with the help of measured void fraction, obtained by a special measurement device, is given. Two thermohydraulic computer codes, RELAP5 and ATHLET, are used for posttest calculations. The aim of these calculations is to investigate the code capability for modeling natural circulation phenomena in VVER-440-type reactors. Therefore, the results of the experiment and both calculations are compared. Both codes predict most of the transient events well, with the exception that RELAP5 fails to predict the dryout period in the core. In the experiment, the hot- and cold-leg loop-seal clearing is accompanied by natural circulation instabilities, which can be explained by means of the ATHLET calculation.

• OSTI ID: 477301
• Journal Information: Nuclear Technology, Vol. 118, Issue 2; Other Information: PBD: May 1997
• Country of Publication: United States
• Language: English

Related Subjects

22 NUCLEAR REACTOR TECHNOLOGY
21 NUCLEAR POWER REACTORS AND ASSOCIATED PLANTS
99 MATHEMATICS
COMPUTERS
INFORMATION SCIENCE
MANAGEMENT
LAW
MISCELLANEOUS
WWER-3 REACTOR
LOSS OF COOLANT
R CODES
A CODES
TEST FACILITIES
REACTOR SAFETY EXPERIMENTS
COMPUTERIZED SIMULATION
COMPARATIVE EVALUATIONS
HEAT TRANSFER
HYDRAULICS