CBRN
Radiological/Nuclear
CBRN event in Spain on Fri 12th July 1996
12th July 1996
Over discussion with Spanish Regulator, licensee discovered that a design modification consisting of introduction of a new ESW automatic start up signal upon loss of conventional service water (CSW), could lead to loss of ESW in scenarios such as failure of CSW pressure control plus failure of any auxiliary contact of CSW breaker followed by a loss of off site power.
Rating Justification: Table I: Events without initiator:
Initiator: Loss of off-site power (high expected) safety function availability: adequate level 1 is chosen, instead of 2, on low probability of the scenario leading to ESW unavailability
Contextual analysis
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Spain (ESP)
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