The PHEBUS Fission Product (FP) program  was initiated in 1988, after the famous severe accidents of nuclear reactors at Three Mile Island (TMI) USA in 1979, and Chernobyl-Ukraine in 1986. The main aim of the program is to study the release, transport and retention of fission products in an 'in-pile facility' under the conditions of a severe accident in a Light Water Reactor (LWR). The Phebus facility, is located at the Institut de Radioprotection et de Surete Nucleaire (IRSN) in Cadarache, France. It incorporates scaled-down replicas of the reactor core, and the primary circuit, including steam generator and containment. The facility simulates reactor conditions and allows the study of basic phenomena governing the releases, transport, deposition and retention of fission products. The studied phenomena take place in the core region, in the primary system and in the containment building. The processes involved in these studies are the following: thermal-hydraulics, fission product release and aerosol physics, which are strongly connected. The PHEBUS Fission Product (FP) test consisted of six experiments. The first two tests were carried out in order to study the release of fission products and their subsequent transport deposition in the primary circuit and containment of a Pressurized Water Reactor (PWR). The FPT1 test was conducted in July 1996 under the low pressure oxidizing or 'steam-rich' conditions using irradiated fuel. The purpose of the FPT1 test was to obtain a significant bundle degradation after the production of about 20 wt.% of liquefied fuel and to release 70% - 80 % of volatile FPs. This work is aimed at individuating suitable models for RADCAL II code, so it is hardly focused on the analysis and evaluation of the response of models inside ASTEC and MELCOR codes.
|Titolo:||STATE OF ART REVIEW CONCERNING ACCIDENTAL MODELS AND CODES RECENTLY APPLIED TO PHEBUS FTP1 EXPERIMENTAL TEST|
|Data di pubblicazione:||26-ago-2010|
|Appare nelle tipologie:||5.2 Documento in Garanzia della Qualità|