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The focus of this report is on a comparative review of four Severe Accident analysis codes leading worldwide: the mechanistic codes ATHLET/CD (Germany), ICARE2 (France), and SCDAP/RELAP5 (US) and the integrated code MELCOR (US). The main context of the report is based on relevant studies performed at the University of Bochum. This comprehends, among others, post-test calculations of OECD International Standard Problems, model development in cooperation with code developers on a bilateral level and in the frame of the 3rd EC Framework Programme 1990-1994 (Reinforced Concerted Action on Reactor Safety) as well as national activities under BMFT funding devoted to comparative code assessment and verification.
In general, the confidence of code predictions decreases with progressing core damage. In consistency to the amount and quality of experimental data available, code models for early phase core degradation particularly up to the onset of core-melt are adequate and verification is possible. Entering into late-phase melt progression marked by the onset of substantial relocation of ceramic material, the level of uncertainty becomes large. The experimental data base is still inadequate in terms of providing a basis for code verification and correspondingly, the codes give only rather qualitative results.

Additional information

Authors: BROCKMEIER U, Institut für Energietechnik, Ruhr-universität Bochum (DE)
Bibliographic Reference: EUR 16937 DE/EN (1996) 288pp., FS, free of charge
Availability: Available from the NFS Programme Office, European Commission, 200 rue de la Loi, B-1049 Bruxelles (BE)
ISBN: ISBN 92-827-7619-0
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