05000445/FIN-2015008-01
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Finding | |
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Title | Failure to Evaluate the Lack of Missile Protection on the Turbine Driven Auxiliary Feedwater Pumps Steam Exhaust Piping |
Description | The team identified a cited violation of 10 CFR Part 50, Appendix B, Criterion III, Design Control, for the licensees failure to evaluate the lack of missile protection on the turbine driven auxiliary feedwater pumps steam exhaust piping. Specifically, since June 13, 2012, the licensee failed to verify the adequacy of design of the turbine driven auxiliary feedwater pumps steam exhaust piping to withstand impact from a tornado driven missile hazard, or to evaluate for exemption from missile protection requirements using an approved methodology. This issue does not represent an immediate safety concern because the licensee performed an operability evaluation, which established a reasonable expectation of operability. The licensee entered this issue into the corrective action program for resolution as Condition Report CR-2015-007869. The licensees failure to analyze the effects of a tornado missile strike on the turbine driven auxiliary feedwater pumps steam exhaust piping was a performance deficiency. The performance deficiency was more than minor because it was associated with the protection against external events factors attribute of the Mitigating Systems cornerstone and affected the cornerstone objective to ensure availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the licensee failed to evaluate a design nonconformance on the turbine driven auxiliary feedwater pumps steam exhaust piping for lack of missile protection. Using Inspection Manual Chapter 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, Exhibit 2, Mitigating Systems Screening Questions, dated June 19, 2012, the team determined that the finding is of very low safety significance (Green) because (1) the finding was not a deficiency affecting the design or qualification of a mitigating system; (2) the finding did not represent a loss of system and/or function; (3) the finding did not represent an actual loss of function of a single train for greater than its technical specification allowed outage time; and (4) the finding does not represent an actual loss of function of one or more non-technical specification trains of equipment designated as high safety-significant in accordance with the licensees maintenance rule program for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. The finding has a human performance cross-cutting aspect associated with conservative bias because individuals failed to use decision-making practices that emphasize prudent choices over those that are simply allowable [H.14]. |
Site: | Comanche Peak ![]() |
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Report | IR 05000445/2015008 Section 4OA2 |
Date counted | Sep 30, 2015 (2015Q3) |
Type: | Violation: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71152 |
Inspectors (proximate) | C Alldredge E Ruesch H Freeman J Drake J Josey |
Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control Technical Specification |
CCA | H.14, Conservative Bias |
INPO aspect | DM.2 |
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Finding - Comanche Peak - IR 05000445/2015008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Comanche Peak) @ 2015Q3
Self-Identified List (Comanche Peak)
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