05000482/FIN-2008005-02
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Finding | |
|---|---|
| Title | Residual Heat Removal Suction Piping Saturation Temperature and Pressure |
| Description | An unresolved item was identified on October 3, 2008, when Wolf Creek issued Licensee Event Report 2008-008-00 which stated that, during reviews for its response to Generic Letter 2008-01, Managing Gas Accumulation in Emergency Core Cooling, Decay Heat Removal, and Containment Spray Systems, it was discovered that both trains of residual heat removal were inoperable in Modes 3 and 4. Wolf Creek places residual heat removal in service during outages while the temperature of the reactor coolant system and the residual heat removal system could be up to 350oF. The temperature of the residual heat removal suction piping could remain sufficiently high to cause the saturation pressure to be greater than the static head from the refueling water storage tank. This may cause the residual heat removal to refueling water storage tank suction check valve to be unable to open against such a pressure differential and cause a steam void to form. This condition could exist on one or both trains of residual heat removal and prevent them from injecting to the reactor upon demand. Wolf Creek stated that residual heat removal was not operable per Technical Specifications 3.5.2 and 3.5.3. This issue is considered unresolved pending additional NRC review of Wolf Creeks root cause evaluation, fluid flow analyses, any past evaluations, compensatory measures, licensee procedures, and corrective actions: Unresolved Item 05000482/2008005-02, Residual Heat Removal Suction Piping Saturation Temperature and Pressure |
| Site: | Wolf Creek  |
|---|---|
| Report | IR 05000482/2008005 Section 1R15 |
| Date counted | Dec 31, 2008 (2008Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | G Vasquez J Drake P Jayroe R Kopriva S Alferink A Fairbanks C Alldredge C Cauffman C Long C Peabody D Graves D Loveless G Millerb Baca C Long G Apger M Peck P Elkmann P Jayroe S Garchow S Hedger V Gaddy W Schau |
| INPO aspect | |
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Finding - Wolf Creek - IR 05000482/2008005 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Wolf Creek) @ 2008Q4
Self-Identified List (Wolf Creek)
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