05000327/FIN-2013004-01
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Finding | |
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| Title | Water Intrusion Into Actuator of Valve 1-FCV-63-72 |
| Description | An excessive amount of water was noted inside the actuator for 1-FCV-63-72, A train RHR containment sump suction valve, which ultimately rendered the valve inoperable. On August 8, 2013 at 0709, the Unit 1 control room reactor operator noted that valve 1-FCV-63-72 showed dual indication on the control board. This valve is the A train RHR suction valve from the containment sump and is normally closed. The valve was verified locally to be in the closed position. No other activities were noted to cause the valve to open. This valve is only stroked during outages (every 18 months) as it is not readily stroked at power due to the system configuration. The licensee determined there was reasonable assurance to consider the valve operable. However, the position indication for the valve was declared inoperable per the post-accident monitoring (PAM) Technical Specification requirement. This was a 30 day Limiting Condition for Operation (LCO). Subsequently on August 14 at 2315, during a routine quarterly IST valve stroke activity, 1-FCV 74-3 failed to stroke in the closed direction from the main control room (MCR). 1-FCV-74-3 is the A train RHR suction valve from the RWST and is normally open. The valve was immediately declared OOS and the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> ECCS tech specification (3.5.2) action statement was entered. Troubleshooting revealed that the actuator of 1-FCV-63-72 contained water and this valve was declared out-of-service. The water intrusion of 1-FCV-63-72 caused shorting of interlock contacts that in turn affected the operability of 1-FCV-74-3. Repairs were made to both valves and the RHR system was returned to operable status on August 17 at 0559. As of the end of the inspection period, the licensee had not completed its formal root cause. The inspectors determined that more inspection was required in order to fully evaluate this issue. Pending additional information from the licensee such that the failure mode of 1-FCV-63-72 can be evaluated, this item was identified as unresolved item (URI) 050000327/2013004-01, Water Intrusion into Actuator of Valve 1-FCV-63-72. |
| Site: | Sequoyah  |
|---|---|
| Report | IR 05000327/2013004 Section 1R15 |
| Date counted | Sep 30, 2013 (2013Q3) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | G Smith J Bartley L Lake M Speck R Hamilton R Kellner W Deschaineg Smithl Lake M Speck R Hamilton R Kellner W Deschaineg Smithp Braxton S Shaeffer W Deschaine |
| INPO aspect | |
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Finding - Sequoyah - IR 05000327/2013004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Sequoyah) @ 2013Q3
Self-Identified List (Sequoyah)
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