05000293/FIN-2011002-01
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Finding | |
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| Title | Application of TS 3.3.8.1 When Control Rod Position Indication is Lost |
| Description | An unresolved item (URl) was identified because additional information regarding the operability of control rods after control rod position indication was lost at PNPS is required to determine whether a performance deficiency exists, Control rod position indication was restored shortly after it was lost. The inspectors will review additional information when it is submitted by Entergy to determine if TS 3.3.8.1, Control Rod Operability, should have been entered when control rod position indication was lost. On January 20,2011, at 5:19 p.m., PNPS lost control rod position indication for all control rods. Instrumentation and control (l&C) technicians began troubleshooting the Rod Position Indication System (RPIS) and identified that the power supply feeding RPIS was inoperable. Operators determined that TS surveillance 4.3.8.1.5, Control Rod Operability, had been completed successfully just prior to losing RPIS and therefore they concluded that they had 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> from the surveillance completion before they would consider the surveillance not met. The inspector\\\'s review of Pilgrim\\\'s TS Bases identified the following statement: The OPERABILITY of an individual control rod is based on a combination of factors, primarily the scram insertion times, the associated control rod scram accumulator status, the control rod coupling integrity, and the ability to determine control rod position. When control rods are determined to be inoperable, TS 3.3.8.1, Control Rod Operability, requires the control rod to be fully inserted into the core within 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />. In addition, the associated Control Rod Drive for each control rod is required to be disarmed within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />. l&C technicians repaired the power supply. RPIS was restored at 9:53 p.m., and control room personnel observed that there had been no change in control rod position. Condition Report (CR) CR-PNP-2O11-0272 was written to address the power supply failure and CR-PNP-2011-0511 was subsequently written to address Entergy\\\'s interpretation and administration of TS 3.3.8.1. URI 05000293/2011002-01, Application of TS 3.3.B.1 when Control Rod Position Indication is Lost. |
| Site: | Pilgrim |
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| Report | IR 05000293/2011002 Section 1R15 |
| Date counted | Mar 31, 2011 (2011Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | T Burns R Rolph B Smith M Schneider K Dunhamd Jacksont Burns S Hansell J Tomlinson B Smith M Schneider K Dunham |
| INPO aspect | |
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Finding - Pilgrim - IR 05000293/2011002 | |||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Pilgrim) @ 2011Q1
Self-Identified List (Pilgrim)
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