Reactor Vessel Closure Head Studs Remain Detensioned During Plant Startup
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Type:  Safety Bulletin/Alert

Publisher:  Nuclear Regulatory Commission, Washington, DC

Published As:  Public

Date: 

Topics:  Nuclear/Nuclear Safety, Quality Assurance, Startup Readiness, Oversight

On November 16, 2011, the Brunswick Steam Electric Plant, Unit 2 was in power ascension following a mid-cycle maintenance outage, which required reactor vessel disassembly. Following the outage, the reactor vessel was reassembled and operators commenced startup operations. With the reactor in Startup Mode operators noted increasing drywell floor drain leakage. An Unusual Event was declared as a result of unidentified drywell leakage exceeding 10 gallons per minute. A manual reactor scram was initiated from approximately 7 percent of rated thermal power due to the continued increase in unidentified drywell leakage.

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