engleski

Analysis of OECD/CSNI ISP-42 Phase A PANDA Experiment Using RELAP5/mod3.3 and GOTHIC 7.2a Codes

The investigation of effectiveness of passive safety systems of recent Advanced Light Water Reactors (ALWR)s has gained an appreciable attention in the last decade. This was the main objective of the international research project TEPSS (Technology Enhancement of Passive Safety Systems) as well as OECD/NEA Committee on the Safety of Nuclear Installations (CSNI) International Standard Problem (ISP)-42 test in PANDA (Passive Nachwärmeabfuhr und Druckabbau Test Anlage) facility. PANDA is a large-scale thermal-hydraulic test facility installed at the Paul Scherrer Institute (PSI) in Switzerland. Its primary goal is the simulation of passive containment for ALWRs. The OECD/CSNI ISP-42 test consists of six sequential phases (Phase A through F). The present work deals with the post-test calculation of the Phase A, including the break of the main steam line and the Passive Containment Cooling (PCC) System Start-Up. The calculation has been performed using stand-alone codes RELAP5/mod3.3 and GOTHIC 7.2a. The analysis was performed as preparatory phase for application of coupled RELAP5 + GOTHIC code for analysis of the same experiment. The intention is to see if there are any benefits in usage of the codes more suited for the coupled system-containment calculation in the situation where that is more important than in the current reactor systems. The comparison between RELAP5 and GOTHIC analysis has shown a good qualitative agreement for all the phases of the simulation and has provided good basis for application of the coupled code and for making decision where the modelling boundary between two codes should be placed.

ISP-42; PANDA; RELAP; GOTHIC

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