05000282/FIN-2008005-02
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Finding | |
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| Title | Component Cooling Water Susceptible to High Energy Line Break Interaction |
| Description | On July 29, 2008, the licensee initiated CAP 1145695 to document that CCW piping located in the turbine building, and used to supply water to the chemistry cold lab, passed directly underneath high energy piping from the 15A and 15B feedwater heaters. As part of the CAP review, operations personnel requested that an operability review be completed to evaluate the impact that a failure of this high energy piping could have on the continued operability of the CCW system. The licensee initially determined that a failure of this piping would have some impact on the Unit 2 CCW system because the 2A train of CCW normally supplied water to the chemistry cold lab. There was no impact on the operation of the Unit 1 CCW system. As a result, this condition was expected to have little impact on overall plant operation because each unit maintained its ability to achieve its required operating condition following a Unit 1 high energy piping failure. Over the next few days, the licensee continued to review the high energy and CCW piping configurations in the Unit 1 and Unit 2 turbine buildings. On July 31, 2008, the licensee identified that a failure in a Unit 2 turbine building high energy line could impact the continued operability of the Unit 2 CCW system. The licensee conducted an operability review and determined that the Unit 2 CCW system was inoperable due to the potential interaction between the Unit 2 turbine building high energy piping and the Unit 2 CCW system. The licensee also determined that the operators ability to bring Unit 2 to a cold shutdown condition following this type of piping failure may be impacted. Operations personnel immediately entered TS 3.0.3 to address this concern. The operators closed several valves in the CCW system to isolate the CCW piping in the turbine building from the other CCW piping. By closing these valves, operations personnel eliminated the potential that the Unit 2 CCW system would become inoperable following a Unit 2 turbine building high energy piping failure. The Unit 2 CCW system was restored to an operable status following the valve closures. The CCW piping to the turbine building remained isolated at the conclusion of the inspection period. At the conclusion of the inspection period, the inspectors were reviewing the high energy and CCW piping configurations in the Unit 1 and Unit 2 turbine buildings to ensure that the piping failures discussed in the licensees CAP documents and Licensee Event Report (LER) 05000306/2008-01 were the most limiting locations. In addition, the inspectors were waiting for information regarding the actual times that each units CCW system was aligned to the chemistry cold lab to determine whether the impacts of a Unit 1 high energy piping failure on the continued operability of the Unit 1 CCW system and the shutdown cooling function of the RHR system needed further review. Finally, the inspectors needed to review several older CAPs and operating experience related to the issue to determine whether the issue was within the licensees ability to foresee and correct (i.e., is it a performance deficiency). As a result, this item was considered unresolved pending the receipt and review of the above information (URI 05000306/2008005-02 |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000282/2008005 Section 1R15 |
| Date counted | Dec 31, 2008 (2008Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.15 |
| Inspectors (proximate) | K Stoedter L Kozak P Zurawskid Mcneilg O'Dwyer J Giessner K Stoedter L Haeg P Zurawski R Jickling R Winter T Bilik |
| INPO aspect | |
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Finding - Prairie Island - IR 05000282/2008005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2008Q4
Self-Identified List (Prairie Island)
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