05000317/FIN-2014003-05
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | 10 CFR 50, Appendix B, Criterion III, Design Control, requires, in part, Measures shall be established to assure that applicable regulatory requirements and the design basis, as defined in 50.2 and as specified in the license application, for those structures, systems, and components to which this appendix applies are correctly translated into specifications, drawings, procedures, and instructions. IEEE Standard 308, IEEE Standard for Class 1E Power Systems for Nuclear Power Generating Stations, Section 4.4, Design Basis, states, in part, The design basis shall include, as a minimum, the following: (f) the malfunctions, accidents, environmental events, and operating modes (see Table 1) that could physically damage Class 1E power systems or lead to degradation of system performance and for which provisions shall be incorporated. Table 1 includes natural phenomena such as Wind, Hurricane, and Tornado. Contrary to the above, from 1996 until May 2013, a design vulnerability was identified which resulted in a degradation of 1A EDG under certain environmental conditions (Sustained high winds); however, Exelon failed to incorporate this vulnerability into the stations design basis documents and system operating instructions and make provisions to address this required design basis element. Exelon entered this issue into the CAP as CR 2012-000511 and CR 2013-004310, implemented appropriate compensatory actions, and implemented a permanent plant modification (ECP-13-000510) in the spring of 2014 to address this design vulnerability. The inspectors determined that the finding was of very low safety significance (Green) in accordance with IMC 0609, Appendix A, The Significance Determination Process (SDP) for Findings At-Power, Exhibit 2, Mitigating Systems Screening Questions, Question 1. Specifically, the finding is a deficiency affecting the design or qualification of a mitigating SSC, in which the SSC maintains its operability or functionality. |
| Site: | Calvert Cliffs  |
|---|---|
| Report | IR 05000317/2014003 Section 4OA7 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | S Kennedy T O'Hara A Rosebrook D Orr D Schroeder E Torres H. Anagnostopoulus R Clagg S Barr |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Calvert Cliffs - IR 05000317/2014003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Calvert Cliffs) @ 2014Q2
Self-Identified List (Calvert Cliffs)
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