05000458/LER-2006-003

09-05-2006

On April 4, 2006, at approximately 2:46 p.m., the Division 2 standby service water system started automatically in response to a low pressure condition in the normal service water system. The plant was operating at 98 percent power at the time of the event. A planned shift of the running normal service water pumps was being performed, and system pressure momentarily dropped below the trip setpoint of the instrumentation that starts the standby service water pumps. This condition is being reported in accordance with 10CFR50.73(a)(2)(iv)(A) as an automatic actuation of the standby service water system. Operators implemented the appropriate response procedures, and the Division 2 SSW system was restored to its normal alignment at 5:36 p.m. that day. The standby service water system responded as designed to the low pressure condition in the normal service water system. This event was of minimal safety significance.

LER-2006-003, Automatic Start of Division 2 Standby Service Water System During Normal Service Water Pump Shift
Docket Numbersequential Revmonth Day Year Year Month Day Yearnumber No. 05000
Event date:	04-04-2006
Report date:	09-05-2006
Reporting criterion:	10 CFR 50.73(a)(2)(iv)(A), System Actuation
4582006003R01 - NRC Website
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05000458/LER-2006-003

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