05000382/FIN-2011003-05
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Finding | |
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| Title | Loss of Reactor Coolant Inventory during the Assembly of Incore Instrumentation Flanges |
| Description | On April 30, 2011, while the plant was in Mode 5 during Refueling Outage 17 (RFO-17), operators identified reactor coolant inventory coming from the incore instrumentation flanges. Based on the restoration from other maintenance activities, operators locked closed the pressurizer spray line vent valve RC-309 on the prior shift to return the valve to its normal position. However, the plant conditions at the time of restoration required RC-309 to be open to provide a reactor coolant vent path during the assembly of incore instrumentation (ICI) flanges. The inspectors noted that the loss of reactor coolant inventory occurred twice prior to the licensee securing from assembly of the ICI flanges. The inspectors questioned whether the operators understood the true condition of the plant since the closed vent path caused inaccurate reactor coolant system level indication. The inspectors also questioned the amount of reactor coolant inventory loss because operators identified water coming out of the ICI flanges twice while charging with the charging pumps. The inspectors reviewed the initial condition report and the maintenance work activities surrounding this evolution. However, the licensee had not completed the apparent cause evaluation prior to the end of the inspection period. This item was unresolved pending further review and investigation of the licensees apparent cause evaluation such that the inspectors can determine if there are performance deficiencies associated with this loss of reactor coolant inventory event. |
| Site: | Waterford  |
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| Report | IR 05000382/2011003 Section 1R20 |
| Date counted | Jun 30, 2011 (2011Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.2 |
| Inspectors (proximate) | D Overland S Makor N Greene C Smith P Elkmann M Davis L Carson R Azuam Davis S Garchow J Melfi R Azua D Overland E Urib |
| INPO aspect | |
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Finding - Waterford - IR 05000382/2011003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Waterford) @ 2011Q2
Self-Identified List (Waterford)
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