ITER DIVERTOR HEAT-TRANSFER SYSTEM AND LOSS OF VACUUM ACCIDENT SEQUENCE ANALYSES OVERVIEW

The paper presents the analyses performed by the European Union ITER H ome Team for five ITER reference accident sequences: two loss of flow and two loss of coolant accidents on the divertor primary heat transfe r system, and one loss of vacuum accident. Tritium and activated mater ials ground and stack environmental releases have been evaluated for e ach one of the accident sequences, up to 7 days from the accident star t. The ATHENA and the INTRA codes are used for the accident transient thermal-hydraulic analysis and for the containment response to coolant leaks, respectively. The NAUA Mod 5M code has been used to assess the radioactive material transport, deposition and leakage inside and thr ough the containment. (C) 1998 Elsevier Science S.A. All rights reserv ed.