05000282/FIN-2010004-03
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Finding | |
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| Title | Licensee-Identified Violation |
| Description | Criterion III to 10 CFR Part 50, Appendix B, requires that measures be established to assure that applicable regulatory requirements and the design basis are correctly translated into specifications, drawings, procedures and instructions. Measures shall also be established for the selection and review for suitability of application of materials, parts, equipment, and processes that are essential to the safety-related functions of structures, systems and components. The D5 and D6 EDG fuel oil system was designed to meet the requirements of Regulatory Guide 1.137. Regulatory Guide 1.137, Revision 1, October 1979, endorsed the requirements of ANSI N195-1976. Document ANSI N195-1976 required that sufficient onsite oil storage shall be provided to operate the required number of diesel generators for seven days or the time required to replenish the oil for sources outside the plant site following any limiting design basis event or accident. Contrary to the above, on May 12, 2010, the licensee identified that the design of the D5 and D6 EDG fuel oil system failed to meet the requirements of ANSI N195-1976, Regulatory Guide 1.137, and 10 CFR Part 50, Appendix B, Criterion III, Design Control. Specifically, the fuel oil system design was such that onsite oil storage was not provided to operate the required number of diesel generators for seven days or the time required to replenish the oil for sources outside the plant site following any limiting design basis event or accident. Corrective actions for this issue included adding oil to the respective fuel oil tanks to ensure that the onsite fuel oil storage was adequate to operate each EDG for 7 days, revising procedures to ensure that the fuel oil volumes remained adequate to meet the 7 day requirement, and initiating an engineering change request to correct the design issue. The inspectors determined that the failure to design the Unit 2 fuel oil storage system as required was a performance deficiency that required an SDP evaluation. The inspectors performed a Phase 1 SDP evaluation in accordance with IMC 0609 and determined that a Phase 2 evaluation was needed because the performance deficiency represented a condition that could cause a loss of system safety function. The inspectors performed a Phase 2 evaluation using the column associated with loss of a fuel oil transfer pump and assuming an exposure time of greater than 30 days. The results of this analysis showed that a Phase 3 evaluation was required due to the presence of white and yellow sequences. A Region III Senior Reactor Analyst performed a Phase 3 SDP evaluation and determined that this issue was of very low safety significance because the volume of fuel oil within the fuel oil system was adequate to support the mission time specified in the licensees probabilistic risk assessment. |
| Site: | Prairie Island  |
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| Report | IR 05000282/2010004 Section 4OA7 |
| Date counted | Sep 30, 2010 (2010Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | C Thomas D Betancourt J Giessner K Stoedter M Phalen N Feliz Ordorno P Zurawski |
| INPO aspect | |
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Finding - Prairie Island - IR 05000282/2010004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2010Q3
Self-Identified List (Prairie Island)
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