05000424/FIN-2010003-03
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | 10CFR50, Appendix B, Criterion XVI, Corrective Action, requires, in part, that conditions adverse to quality shall be promptly identified and corrected. Contrary to the above, corrective actions taken in response to an identified procedural error (as documented in CR 2009107697 on 8/11/09), which were required to prevent the closure of 2HV-8809B (RHR discharge isolation valve to loops 3 and 4) during valve testing in Modes 1 and 2, were not promptly implemented. As a result, on 1/5/2010 while Unit 2 was in Mode 1, RHR isolation valve, 2HV-8809B, was stroked closed twice during surveillance testing, which resulted in two unplanned T.S. 3.0.3. entry conditions. This finding is of very low safety significance (Green) due to the fact that the valve was cycled closed twice for a short duration (approximately 1 minute) and then immediately reopened. Also, a system operator, who was in continuous communications with the control room, was stationed at the valve during the test to manually open the isolation valve if a safety injection were required. A regional Senior Reactor Analyst performed a Phase 3 evaluation under the Significance Determination Process for this performance deficiency. Based upon this evaluation, the performance deficiency was characterized as very low safety significance (Green). The dominant accident sequence was a Loss of Coolant Accident with the failure of the Residual Heat Removal System due to the performance deficiency. Consequently, core cooling was not maintained and core damage ensued. The major assumption of the evaluation was the exposure time of one minute. The licensee has documented this event in their corrective action program (CR 2010102068), issued LER 05000425/2010-001, conducted an apparent cause determination, and developed applicable corrective actions. |
| Site: | Vogtle  |
|---|---|
| Report | IR 05000424/2010003 Section 4OA7 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | S Shaeffer R Chou M Cain B Collins T Chandler |
| INPO aspect | |
| ' | |
Finding - Vogtle - IR 05000424/2010003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Vogtle) @ 2010Q2
Self-Identified List (Vogtle)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||