05000416/FIN-2010004-08
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Title 10 CFR 50.54(q) requires in part that a licensee follow and maintain in effect emergency plans which meet the standards of 10 CFR 50.47(b). Title 10 CFR 50.47(b)(4) requires in part that a standard emergency classification and action level scheme be in use and Grand Gulf Activation of the Emergency Plan, Revision 119, Section 5, required that an unusual event be declared if vibratory ground motion felt in the protected area and recognized as an earthquake AND activated seismic switches as indicated by activation of the seismic monitoring system strong motion accelerometer system activation. Contrary to 10 CFR 50.54(q), from April 21, 2010, through August 17, 2010, Grand Gulf Nuclear Station failed to implement adequate compensatory measures to address the out-of-service seismic instruments, therefore preventing the prompt assessment and classification of an unusual event following an earthquake. Specifically, with the seismic activation equipment in an inoperable condition, the site failed to establish adequate compensatory measures due to the phone number provided to operators in the control room not being manned 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> a day, seven days a week, which would not ensure prompt assessment and implementation of the facility emergency plan. This issue was documented in the licensees corrective action program in condition report CR GGN-2010-06140. This finding is of very low safety significance because the finding did not represent a loss of function or degradation of a Risk Significant Planning Standard in that other seismic recording instruments were available which would permit the site to make an accurate classification of the event, although the classification may have been delayed beyond 15 minutes from the occurrence of an earthquake. |
| Site: | Grand Gulf  |
|---|---|
| Report | IR 05000416/2010004 Section 4OA7 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | No Cornerstone |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Graves D Stearns R Smith A Barrett V Gaddy |
| INPO aspect | |
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Finding - Grand Gulf - IR 05000416/2010004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Grand Gulf) @ 2010Q3
Self-Identified List (Grand Gulf)
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