05000315/FIN-2015004-06
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Finding | |
|---|---|
| Title | Licensee-Identified Violation |
| Description | A finding of very low safety significance (Green) with an associated NCV of TS 5.4, Procedures, was identified by the licensee on October 23, 2015, when the boron concentration in the #3 ECCS Accumulator on Unit 1 was found below the TS minimum value of 2400 ppm. This placed the Unit in an unplanned 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> TS LCO action statement. The licensee had just completed a drain-and-fill of the accumulator to raise boron concentration. Boron concentration had slowly been decreasing over several weeks due to RCS back-leakage through a check valve between the ECCS and the RCS. In September, Engineering identified that the header between the RCS and ECCS was likely filled with the more dilute RCS water; therefore, Engineering concluded that the header would need to be flushed before any drain-and-fill evolutions were performed. However, this information did not reach the operations staff that attempted to raise boron concentration on October 23. As a result, boron concentration in two samples taken after the fill were 2390 ppm and 2396 ppm which is below TS minimum. The finding was more than minor because it adversely affected the Procedure Quality aspect of the Mitigating Systems cornerstone, whose objective is to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The issue screened as Green utilizing IMC 0609 Appendix A, The Significance Determination Process for Findings at Power. Specifically, in Exhibit 2, the inspectors answered no to the questions in Section A. The licensee entered the issue into their CAP as AR201513758. |
| Site: | Cook  |
|---|---|
| Report | IR 05000315/2015004 Section 4OA7 |
| Date counted | Dec 31, 2015 (2015Q4) |
| Type: | NCV: Green |
| cornerstone | Emergency Prep |
| Identified by: | Licensee-identified |
| Inspection Procedure: | |
| Inspectors (proximate) | G Edwards J Ellegood J Mancuso K Riemer T Go T Taylor |
| Violation of: | Technical Specification Technical Specification - Procedures |
| INPO aspect | |
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Finding - Cook - IR 05000315/2015004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Cook) @ 2015Q4
Self-Identified List (Cook)
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