05000282/FIN-2010010-01
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Finding | |
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| Title | Failure to Ensure Design Measures Were Appropriately Established for the Emergency Diesel Generator, Auxiliary Feedwater, and Safety-Related Battery Systems |
| Description | An apparent violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, was identified by the inspectors due to the licensees failure to establish measures to ensure that engineered safety features such as the batteries were not adversely affected by events that cause turbine building flooding. As systems. This issue was entered into the licensees corrective action program (CAP) as measures to ensure that the systems listed above were not adversely impacted following This finding was determined to be more than minor because it impacted the design also impacted the Mitigating Systems cornerstone objective of ensuring the availability, undesirable consequences. The inspectors performed a Phase 1 SDP evaluation and determined that a Phase 3 evaluation was required because the finding represented a loss of safety function of multiple mitigating systems. A Phase 2 SDP evaluation was not performed because the Phase 2 SDP worksheets do not apply to internal flooding events. The results of the Phase 3 SDP assessment showed that this finding was potentially Greater than Green. No cross-cutting aspect was assigned to this finding systems equipment to turbine building internal flooding events were made more than B. Licensee-Identified Violations No violations of significance were identified. This report covers the review of a design deficiency associated with the failure to protect several safety-related systems from a loss of safety function following a turbine building internal flooding Yellow, Red) using Inspection Manual Chapter (IMC) 0609, Significance Determination Process (SDP). Findings for which the SDP does not apply may be Green or be assigned a severity level after NRC management review. The NRCs program for overseeing the safe rs . emergency diesel generators, the auxiliary feedwater system, and the safety-related a result, flooding from these events would cause a loss of safety function for these CAP 1178236. Upon identifying this issue, the licensee implemented compensatory a turbine building internal flood. control and external events attributes of the Mitigating Systems cornerstone. The finding reliability, and capability of systems that respond to initiating events to prevent because licensee decisions made in regard to evaluating the susceptibility of mitigating inte 3 years ago and therefore, not reflective of current plant performance |
| Site: | Prairie Island  |
|---|---|
| Report | IR 05000282/2010010 Section 4OA5 |
| Date counted | Jun 30, 2010 (2010Q2) |
| Type: | AV: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | |
| Inspectors (proximate) | R Orlikowski K Stoedter R Lerch L Kozak P Zurawski D Betancourtj Giessnerk Stoedter L Kozak P Zurawski |
| INPO aspect | |
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Finding - Prairie Island - IR 05000282/2010010 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Prairie Island) @ 2010Q2
Self-Identified List (Prairie Island)
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