Community Research and Development Information Service - CORDIS


Inadvertent occurrences in PWRs may require alternative recovery procedures to prevent limiting consequences which could endanger the integrity of the plant. Within this context, the underlying phenomenologies of intentional primary cooling system depressurisation to enhance cooldown procedures have been investigated in the LOBI-MOD2 test facility for a range of postulated PWR accident conditions. In this paper, specific reference is made to: 1) Primary system bleed and feed in transient conditions. 2) Intentional augmentation of primary system depressurisation in a small break LOCA. The experimental results have shown that 1) bleed and feed is a viable recovery procedure provided that the PORV capacity is properly sized and 2) the consequences of a small break LOCA could be substantially mitigated by enhancement of ECC safety injection through deliberate increase of primary system depressurisation rate.

Additional information

Authors: ADDABBO C, JRC, 21020 Ispra (IT);WORTH B, JRC, 21020 Ispra (IT)
Bibliographic Reference: Paper presented: OECD-CSNI Specialists Meeting on International Coolant System Depressurization, Garching (DE), June 12-14, 1989
Availability: Available from (1) as Paper EN 34895 ORA
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