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On July 20, 2011 at 1315 hours it was dete … On July 20, 2011 at 1315 hours it was determined that a design deficiency at the Wolf Creek Nuclear Operating Corporation (WCNOC) constituted a fire protection program concern which could adversely affect the ability to achieve and maintain safe shutdown in the event of a control room fire. In the event of a postulated control room fire, a normally closed valve (EFHV0060) on the Essential Service Water (ESW) system return from the Component Cooling Water (CCW) heat exchanger could spuriously open. If this occurs, the flow balance in the ESW system would be affected and cooling flow to other essential components could be reduced to below the minimum required flow.</br>Present system operability is not affected as there has been no occurrence of a fire in the Control Room and compensatory actions are in place to detect and mitigate the effects of a fire in the Control Room. An hourly fire watch is currently in place in the control room and will remain in place until this issue is resolved. In addition to the hourly fire watch, alternate shutdown procedure OFN RP-017 is being revised to include interim compensatory actions to deenergize, and verify closed, valve EFHV0060.</br>This event is being reported in accordance with 10 CFR 50.72 (b)(3)(ii)(B) and 10 CFR 50.72 (b)(3)(v)(A) as an unanalyzed condition that significantly degrades plant safety. A follow-up licensee event report will be made in 60 days.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
18:15:00, 20 July 2011 +
47,076 +
16:06:00, 20 July 2011 +
18:15:00, 20 July 2011 +
On July 20, 2011 at 1315 hours it was dete … On July 20, 2011 at 1315 hours it was determined that a design deficiency at the Wolf Creek Nuclear Operating Corporation (WCNOC) constituted a fire protection program concern which could adversely affect the ability to achieve and maintain safe shutdown in the event of a control room fire. In the event of a postulated control room fire, a normally closed valve (EFHV0060) on the Essential Service Water (ESW) system return from the Component Cooling Water (CCW) heat exchanger could spuriously open. If this occurs, the flow balance in the ESW system would be affected and cooling flow to other essential components could be reduced to below the minimum required flow.</br>Present system operability is not affected as there has been no occurrence of a fire in the Control Room and compensatory actions are in place to detect and mitigate the effects of a fire in the Control Room. An hourly fire watch is currently in place in the control room and will remain in place until this issue is resolved. In addition to the hourly fire watch, alternate shutdown procedure OFN RP-017 is being revised to include interim compensatory actions to deenergize, and verify closed, valve EFHV0060.</br>This event is being reported in accordance with 10 CFR 50.72 (b)(3)(ii)(B) and 10 CFR 50.72 (b)(3)(v)(A) as an unanalyzed condition that significantly degrades plant safety. A follow-up licensee event report will be made in 60 days.</br>The NRC Resident Inspector has been notified. NRC Resident Inspector has been notified. +
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100 +
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18:15:00, 20 July 2011 +
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