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2. Specific suggestions for analysis Loss of off-site power is usually not considered for this type of event. Conservative conditions for reactivity feedback typically occur at the BOC. Depending on the selected acceptance criterion (short term or long term cooling objectives), application of a single failure criterion needs to take into account potential failures in auxiliary feedwater pumps, pressurizer relief or safety valves, SG safety valves and steam dump stations. 3. 1. Initiating events and safety aspects Reduction of the secondary side heat removal capability can also be caused by an increase of the SG secondary side pressure and temperature as a consequence of steam flow reduction.

2. Specific suggestions for analysis Loss of off-site power is usually not considered for this type of event. Conservative conditions for reactivity feedback typically occur at the BOC. Depending on the selected acceptance criterion (short term or long term cooling objectives), application of a single failure criterion needs to take into account potential failures in auxiliary feedwater pumps, pressurizer relief or safety valves, SG safety valves and steam dump stations. 3. 1. Initiating events and safety aspects Reduction of the secondary side heat removal capability can also be caused by an increase of the SG secondary side pressure and temperature as a consequence of steam flow reduction.

The likelihood of a large PRISE leakage due to a collector break itself was not included in the original design of WWER reactors. However, operating experience and in-service inspections have demonstrated the potential for large SG leaks for this design. The safety aspects associated with a PRISE accident are as follows: — Direct radioactivity release to the environment, bypassing the containment via steam dumps and/or via the SG safety valves; — Reduced core cooling (short and medium term); — PTS of the RPV due to cooldown and subsequent re-pressurization following break isolation on the primary side (typical for WWER-440s); — Boron dilution and reactivity insertion due to reverse flow (from secondary to primary side) through the break; — Potential for an SA initiator because of long term loss of ECCS water inventory.

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Accid. Anal. - Nuclear Powerplants with PWRs


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