05000456/FIN-2015003-01
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | Title 10 of the Code of Federal Regulations, Part 50, Appendix B, Criterion III, Design Control, requires, in part, that measures shall be established to assure that applicable regulatory requirements and the design basis are appropriately translated into specifications, drawings, procedures, and instructions. Contrary to the above, as of October 10, 2014, the licensee failed to translate the design basis essential service cooling pond berm height into procedures and instructions. Specifically, procedure BwVSR 3.7.9.3, "Braidwood Cooling Lake Hydrographic Survey," did not ensure that the height of the essential service cooling pond berm was being verified. This issue was entered into the licensees CAP as IR 2400960; The UHS EL. At Top of the East Slope Found Less than 590 ft, dated October 24, 2014, and the procedure was corrected. The inspectors determined that the performance deficiency was more than minor in accordance with IMC 0612, Appendix B, Issue Screening, because the issue was associated with the Design Control attribute of the Mitigating Systems cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences (i.e., core damage). Specifically, following a seismic event that drains the non-essential main Braidwood cooling pond, the essential cooling pond (i.e., UHS) would have a decrease in available inventory at the start of a design basis event. This could reduce the available net positive suction head for the service water pumps that take suction from the UHS, as well as potentially resulting in the UHS design temperature of 100 degrees Fahrenheit being exceeded. The inspectors determined the finding could be evaluated using the Significance Determination Process in accordance with IMC 0609, "Significance Determination Process," Attachment 0609.04, Initial Characterization of Findings, dated June 19, 2012, and Appendix A, The Significance Determination Process for Findings At-Power, Exhibit 2, Mitigating Systems Screening Questions, dated June 19, 2012. The inspectors determined that the finding affected the design of the UHS, but did not result in a loss of operability, and therefore screened the finding as having very low safety significance (Green). |
| Site: | Braidwood  |
|---|---|
| Report | IR 05000456/2015003 Section 4OA7 |
| Date counted | Sep 30, 2015 (2015Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | A Schwab D Betancourt D Mcneil D Reeser J Benjamin J Mcghee L Rodriguez M Jones T Go |
| Violation of: | 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Braidwood - IR 05000456/2015003 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Braidwood) @ 2015Q3
Self-Identified List (Braidwood)
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