05000277/FIN-2009002-04
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Finding | |
|---|---|
| Title | HPCI System Torus Suction Valve Failures |
| Description | The inspectors identified an unresolved item (URI) related to the adequacy of preventive maintenance on MOVs. On March 12 and 21, 2009, HPCI torus suction valves in Unit 2 and Unit 3, respectively, failed to stroke fully open during routine testing. Dry and hardened stem lubricant was identified in both instances. This issue will remain unresolved pending completion of PBAPSs root cause determination and completion of extent of cause and condition evaluations of MOVs in other accident mitigation systems. On March 12, the Unit 2 HPCI system suppression pool suction valve, MO-2-23-058, failed to fully open when repositioned during quarterly surveillance testing. The valve stroke was interrupted by operation of the motor operator torque switch. On March 21, the Unit 3 HPCI system suppression pool suction valve, MO-3-23-057, failed to fully open when it was repositioned during quarterly testing. The valve stroke was interrupted by actuation of the motor operator torque switch. In both instances, the stem lubricant was found to be dry and hardened. Failures to stroke appeared to be repeat occurrences of a valve failure to stoke event which occurred in October 2007.PBAPS determined that other safety-related MOVs may be similarly affected by the stem lubricant hardening issue. The EOC and extent of cause evaluations were ongoing at the end of the inspection period. These evaluations included selecting a sample of MOVs to be visually examined for dry and/or hardened stem lubricant. In addition, PBAPS selected a number of MOVs for diagnostic testing with monitoring equipment connected to determine if any degradation of MOV capability had occurred since the last diagnostic testing of that MOV. At the end of the inspection period, these activities were still in progress; therefore, this item remains unresolved: URI 05000277, 278/2009002-04, High Pressure Coolant Injection (HPCI) System Torus Suction Valve Failures |
| Site: | Peach Bottom  |
|---|---|
| Report | IR 05000277/2009002 Section 4OA3 |
| Date counted | Mar 31, 2009 (2009Q1) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | M Brown G Johnson R Fuhrmeister F Bower J Tomlinson P Krohn E Torresm Browns Barr P Finney R Nimitz F Bower A Ziedonis P Krohn J Commisky |
| INPO aspect | |
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Finding - Peach Bottom - IR 05000277/2009002 | |||||||||||||||||||||||||||||||||||||
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Finding List (Peach Bottom) @ 2009Q1
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