05000390/FIN-2012003-02
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Finding | |
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| Title | |
| Description | The inspectors identified a URI related to 10 CFR 50 Appendix B, Criterion XVI, Corrective Action, for failure to take adequate corrective actions to ensure the reliability of A train sump pumps 3A and 3B. During the semi-annual internal flooding inspection, inspectors were verifying the licensees capability to insure that the IPS sump pumps were capable of removing assumed leakage into the ERCW strainer rooms, A train and B train. This system relies on the capability of two 25 gpm sump pumps in each strainer room to remove leakage from ERCW strainers and fire protection strainers. Additionally, they are credited in the external flooding study to be operable to remove any leakage through the exterior of the building. These ERCW strainers are required for operation of the ERCW system A train and the fire protection system A train. Inspectors reviewed the maintenance history of the sump pumps to verify that they were being maintained in a manner that would fulfill their operability requirements. These pumps are in the Augmented Inservice Testing (AIST) Program under a two-year test frequency. Licensee records indicate that on November 4, 2007, the 3A sump pump was replaced. Each subsequent test following this time frame has exhibited continual decreasing flow below the allowable limits of TI-50.021, Intake Pumping Station Strainer Room A Sump Pump A Performance Test, up until the present. On November 2, 2007, 3B sump pump was replaced with the power leads reversed leading to reverse rotation and low flow. This was not corrected until January 24, 2008. The sump pump tested satisfactorily until January 16, 2011, when the scheduled test per TI-50.022, Intake Pumping Station Strainer Room A Sump Pump B Performance Test, was aborted due to a failed breaker disconnect switch which had been in the work planning system since 2009. On October 19, 2011, in a situation of high demand due to fire pump strainer leakage, the licensee determined that sump pump 3B would not start in local manual control. Additionally, the 3A sump pump was pumping, but all flow was being pumped backward through 3B sump pump. This resulted in an inability of the sumps pumps to remove water from the room. Operator actions were required in this remote structure to stop the level of water rise. Pending additional information from the licensee which can verify the adequacy of the corrective action for IPS sump pump 3B start failure |
| Site: | Watts Bar  |
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| Report | IR 05000390/2012003 Section 1R06 |
| Date counted | Jun 30, 2012 (2012Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.06 |
| Inspectors (proximate) | R Monk S Shaeffer P Higgins A Vargas T Lighty K Miller T Sur Monks Shaeffer K Miller |
| INPO aspect | |
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Finding - Watts Bar - IR 05000390/2012003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Watts Bar) @ 2012Q2
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