Finding | |
|---|---|
| Title | Loss of Both Trains of Control Room Emergency Filtration System (CREFS) Actuation Instrumentation |
| Description | Technical Specification (TS) 3.3.7, Limiting Condition for Operation (LCO) Applicability, LCO 3.3.7 Condition P, requires that when four intake radiological gas monitor channels are inoperable, operators must place one CREFS train in each unit in the emergency mode within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. Contrary to the above, on September 22, 2011, the licensee discovered that AHV12153 was closed. This condition prevented air flow past all four radiological gas monitors rendering them inoperable. A review of the plant computer system showed that the valve was closed on September 19, at 2015. Thus for a period of approximately two and half days, Unit 1 & 2 were operated in a condition prohibited by TS 3.3.7, which is applicable in Modes 1, 2, 3 and 4. This finding is not greater than green using the IMC 609 Phase 1 worksheet due to the finding only representing a degradation of the radiological barrier function provided for the control room. The licensee has entered this issue into their corrective action program as CR 353533, completed a basic cause determination, drafted LER 05000424,425/2011-003, and immediately restored the valve to its proper position |
| Site: | Vogtle  |
|---|---|
| Report | IR 05000424/2011004 Section 4OA7 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | R Hamilton W Loo J Hickey J Dodson M Cain T Chandler R Williams T Lighty J Rivera A Rodgers |
| INPO aspect | |
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Finding - Vogtle - IR 05000424/2011004 | ||||||||||||||||||||||||||||||||||||||||||
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Finding List (Vogtle) @ 2011Q3
Self-Identified List (Vogtle)
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