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1. (WO2001039207) A METHOD FOR OPERATING A NUCLEAR PLANT

Pub. No.:    WO/2001/039207    International Application No.:    PCT/SE2000/002377
Publication Date: Fri Jun 01 01:59:59 CEST 2001 International Filing Date: Thu Nov 30 00:59:59 CET 2000
IPC: G21C 17/00
G21C 17/022
Applicants: WESTINGHOUSE ATOM AB
SIHVER, Lembit
Inventors: SIHVER, Lembit
Title: A METHOD FOR OPERATING A NUCLEAR PLANT
Abstract:
The invention concerns a method for operating a nuclear plant comprising a reactor with a set of fuel assemblies each comprising a number of fuel units. Each fuel unit comprises at least one cladding member, arranged to enclose a nuclear fuel so that a gap is formed between the nuclear fuel and the cladding member. The method comprises the steps of establishing a primary fuel defect of one of said fuel units, determining the value of a first primary parameter regarding the burn-up degree of the nuclear fuel of the fuel unit in question, the value of a second primary parameter regarding effect history for the fuel unit in question, the value of a third primary parameter regarding the size of said gap of the fuel unit in question, and calculating the development of the primary fuel defect and of future leakage of nuclear fuel from the fuel unit in question with regard to said primary parameters.