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In the framework of NET safety analysis, an activity devoted to the decay heat hazards assessment is underway at JRC Ispra. Loss of flow accidents (LOFA) due to pumping shut-down are under investigation. The following high-frequency accident scenarios have been assessed: - pump failure in one main cooling circuit, and - whole reactor pump failure due to external black-out. An automatic plasma shut-down is assumed in both cases. An inherent, passive safety approach is used, for reliability reasons, to reach this target. Passive heat removal mechanisms taken into account are radiation between components and residual cooling capability by thermosyphon effect in the main cooling circuits. Results show that in all cases of loss of pumping capability, water boiling can be avoided so that classification of the accidents as UPSET conditions is possible.

Additional information

Authors: SORIA A, JRC Ispra (IT);RENDA V, JRC Ispra (IT);PAPA L, JRC Ispra (IT);FENOGLIO F, Politecnico di Torino (IT)
Bibliographic Reference: Article: Fusion Technology, Vol. 16 (1989) pp. 474-493
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