05000275/FIN-2011004-07
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | Diablo Canyon Power Plant Technical Specification 3.7.10, Control Room Ventilation System (CRVS) , required two CRVS trains to be operable. Contrary to this, the licensee failed to maintain the control room ventilation system in the design configuration. On August 29, 2011 plant operators identified that the integrity of the control room habitability envelope had been lost after maintenance personnel erroneously removed a blank flange supporting maintenance on the Unit 2 ventilation system inlet isolation dampers. This condition could have prevented fulfillment of the control room to meet the safety function to provide adequate radiation protection to prevent the occupants from exceeding 5 rem whole body (equivalent) radiation exposure for the duration of an accident. The operators identified that the boundary was inoperable and entered Technical Specification 3.7.10-B.1 and took corrective action to reinstall the blank flange to restore integrity of the control room envelope. The performance deficiency was more than minor because it was similar to example 4.a, in Manual Chapter 0612, Appendix E, Examples of Minor Issues, because the inspectors concluded that the removal of the blank flange adversely affected safety-related equipment. The inspectors used Inspection Manual Chapter 0609.04, Phase 1 - Initial Screening and Characterization of Findings, to analyze the finding. The inspectors concluded that the failure to maintain the operability of the control room ventilation system in accordance with Technical Specification 3.7.10, was a finding of very low safety significance (Green) because the finding only represented a degradation of the radiological barrier function provided for the control room. Pacific Gas and Electric entered the issue into the corrective action program as Notification 50427567 and 50428115. |
| Site: | Diablo Canyon  |
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| Report | IR 05000275/2011004 Section 4OA7 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | G Guerra M Peck G Miller C Osterholtz E Ruesch D Reinert L Micewski |
| INPO aspect | |
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Finding - Diablo Canyon - IR 05000275/2011004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2011Q3
Self-Identified List (Diablo Canyon)
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