05000390/FIN-2010007-03
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Finding | |
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| Description | The inspectors opened an URI involving an OMA credited for establishing (RCP) seal cooling. Specifically, a hand-wheel on a valve required by procedure to be closed in the event of a fire in the control building, FA 48 (AV-076), was missing. The licensee maintained that the action, if not performed, would not have an effect on their ability to achieve and maintain safe shutdown. This item is pending further inspector review. In the event of a fire in AV-076, procedure AOI-30.2 C69, Fire Safe Shutdown Control Building, directed operators to establish RCP seal injection via air-operated valve 1-FCV-62-93. While performing a field walk-down of procedure AOI-30.2 C69, the inspectors identified that Step 4 of Auxiliary Unit Operator Checklist 1 could not be completed as directed, because the hand wheel for valve 1-ISV-32-2934 was missing. Valve 1-ISV-32-2934 is a manual air isolation valve on a 34 inch airline to air-operated valve 1-FCV-62-93. The procedure directed the operator to close valve 1-ISV- 32-2934 to isolate air to valve 1-FCV-62-93, and open the petcock on the regulator for valve 1-FCV-62-93 to bleed off the air, which forced valve 1-FCV-62-93 to fail open. This would allow charging flow to the RCP seals to be controlled by the seal water injection filter via a series of manually-operated valves. This would also provide makeup to the RCS since the primary injection path would be isolated. The inspectors identified that the last time valve 1-ISV-32-2934 was operated was on February 23, 2008, per Work Order WO 07-816218-000. The licensee staff initially told the NRC inspectors that this manual action was not required for SSD. Inspectors requested an evaluation of the impact of the failure to perform this manual action on the ability to achieve and maintain SSD. Upon identification of the missing hand-wheel on October 8, 2010, the licensee initiated Service Request SR-262219 to replace the missing hand-wheel. On October 20, 2010, the inspectors requested a copy of the corrective action documents for the missing hand-wheel, and were told that the service request had been closed to a work order which was still open. As a result, the hand-wheel had not been replaced. The licensee informed the inspectors that in accordance with their corrective action program, a PER should have been initiated for this issue. The licensee then initiated SR 269706 to address the failure to write a PER and untimely replacement of the hand-wheel. The hand-wheel was replaced by licensee staff on October 30, 2010, per WO 11524638. The licensee had not established compensatory measures for the time period the hand wheel was missing, because tools were available in an Operations personnel cabinet for individuals to use. However, the need to obtain the necessary tools to manually close valve 1-ISV-32-2934 was not discussed in procedure AOI-30.2 C69 or evaluated to determine if extra time was available to obtain the tools. On October 22, 2010, inspectors requested information on the effect on SSD if the action was not completed successfully, the fire areas where the action was credited, and the design basis impact if the RCP seal cooling flow criteria was not met. The licensee staff provided a response to the inspectors on November 8, 2010, in which they indicated that RCP seal injection flow rates would be adequate without closing valve 1-ISV-32-2934. As a result of reviewing this information the inspectors requested additional information regarding seal injection flow rates and the effect on the pressurizer. The licensee provided additional information to NRC on December 1, 2010. A conference call with the licensee was conducted on February 24, 2011, to discuss a discrepancy between the licensees November 8, 2010, response and calculation WBNOSG4- 031. On March 24, 2011, the licensee provided clarifying information to the inspectors related to this issue. Pending NRC review of all information this issue is identified as URI 05000390/2010007-003, Questions Related to OMA to Establish RCP Seal Cooling in the Event of a Fire in AV-076, Computer Room. |
| Site: | Watts Bar  |
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| Report | IR 05000390/2010007 Section 1R05 |
| Date counted | Dec 31, 2010 (2010Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | N Staples G Wiseman R Fanner R Nease L Suggsj Dymekj Grant J Montgomery M Cummings O Lopez P Braxton S Shaeffer D Jones E Patterson G Wiseman |
| INPO aspect | |
| Finding closed by | |
| IR 05000390/2013615 (6 November 2013) | |
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Finding - Watts Bar - IR 05000390/2010007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2010Q4
Self-Identified List (Watts Bar)
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