05000395/FIN-2016004-07
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | TS 6.8.1, Procedures and Programs, requires in part that written procedures be maintained covering the activities recommended in Appendix A of Regulatory Guide 1.33, Rev. 2, Section 9, Procedures for Performing Maintenance. Contrary to this, on October 4, 2016, the licensee determined they had failed to establish station procedures to adequately remove ventilation access covers for fire damper inspections during plant modes that would not present a HELB challenge to those components qualified for mild EQ conditions. NRC IMC 0609.04 and NRC IMC 0609 Appendix A screening determined that the finding represented a loss of the short term heat removal safety function within the Mitigating Systems Cornerstone and required a detailed risk evaluation. A bounding analysis was performed by a regional SRA with the following major analysis assumptions: a fifty one minute exposure period, a HELB frequency of 7.7E-3/year from the NRC VC Summer SPAR model, and a conditional core damage probability given a HELB of 1.0. The risk increase due to the finding was <1.0E-6/year, a GREEN finding of very low safety significance. The risk was mitigated by the short exposure. The licensee has documented this problem in their CAP as CR-16-05696. |
| Site: | Summer  |
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| Report | IR 05000395/2016004 Section 4OA7 |
| Date counted | Dec 31, 2016 (2016Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Masters C Smith D Lanyi E Coffman G Ottenberg J Reece |
| Violation of: | Technical Specification - Procedures |
| INPO aspect | |
| ' | |
Finding - Summer - IR 05000395/2016004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Summer) @ 2016Q4
Self-Identified List (Summer)
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