UNIT SCRAM DUE TO BLOWHOLE IN EMERGENCY REACTOR COOLING SYSTEM(ECCS) PIPE

The unit was operating at nominal power. During equipment routine examination/inspection a blowhole was discovered in the weld in the pipeline of water supply from the "non-emergency reactor side" pump of the emergency reactor cooling system (ECCS or SAOR) to ECCS header. In accordance with the Technical Specification personnel scrammed the reactor.
No degradation of radiological situation in the controlled area and on site occurred.
Basis for rating:
Safety function availability - full
According to Table I of the INES user's manual (revision 1992) the basic rating is 0 (A-3). According to Table II - (A-1).
No additional factors necessitating to raise the basic rating by 1 have been revealed.

Location: 
SMOLENSK-1
Event date: 
Wed, 1995-09-13
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