05000338/FIN-2015003-02
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Finding | |
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| Title | Technical Specification (TS) Required Shutdown due to Reactor Coolant System Pressure Boundary Leakag |
| Description | A violation of TS occurred because it constituted pressure boundary leakage. North Anna TS Limiting Condition for Operation (LCO) 3.4.13.a requires, in part, that RCS leakage be limited to No PRESSURE BOUNDARY LEAKAGE, when in Modes 1, 2, 3 and 4. The associated action statement requires, in part, that with any (RCS) pressure boundary leakage, the unit be in Hot Standby within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in Cold Shutdown within the following 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. Contrary to the above, on December 23, 2014, it was discovered that RCS pressure boundary leakage did exist while the unit was in Modes 1, 2, 3 and 4; and that the unit was not placed in Hot Standby within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in Cold shutdown within the following 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. Although a violation of the TS occurred, the violation was not attributable to an equipment failure that was avoidable by reasonable licensee quality assurance measures or management controls. Therefore, the violation of TS 3.4.13.a was not associated with a licensee performance deficiency. The inspectors concluded that the violation would normally be characterized as Severity Level III in accordance with Enforcement Policy section 6.1.c. However, because the violation was not associated with a licensee performance deficiency and it was not avoidable by reasonable licensee QA measures or management controls, enforcement discretion (Enforcement Action (EA)-15-120) in accordance with Section 2.2.4.d and 3.5 of the Enforcement Policy was provided. The violation will not be considered in the assessment process or the NRCs Action Matrix. This issue was documented in the licensees corrective action program as CR568000. Licensee corrective actions included the following: Performed an extent of condition NDE of all three cold leg loop drain lines for Unit 1. Results indicated low level craze cracking and a circumferential defect in the similar elbow on C drain loop piping. No issues were found in the A drain loop piping. Replaced the cracked elbow from the B loop drain piping. Provided the failed B loop elbow/piping for materials failure analysis. The results of the evaluation are being used to confirm the direct cause of thermal fatigue and provide more insight on the failure mechanism. Performed an evaluation in accordance with ASME Section XI Sub-article IWB- 3640, Evaluation Procedures and Acceptance Criteria for Austenitic Piping, of the Unit 1 C loop drain elbow. The results determined that it was acceptable to operate the unit until the Spring 2015 Refueling Outage (RFO), during which, the repairs were made. Discontinued taking RCS cold leg (Tc) chemistry samples. RCS chemistry samples are currently being taken from the hot leg (Th). Informed the EPRI Materials Reliability Program of this failure, and continue to work with the industry on this and similar issues. |
| Site: | North Anna  |
|---|---|
| Report | IR 05000338/2015003 Section 4OA3 |
| Date counted | Sep 30, 2015 (2015Q3) |
| Type: | Violation: Green |
| cornerstone | Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | A Masters G Kolcum J Parent L Mckown T Skaggs-Ryan |
| Violation of: | Technical Specification - Procedures Technical Specification |
| INPO aspect | |
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Finding - North Anna - IR 05000338/2015003 | ||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (North Anna) @ 2015Q3
Self-Identified List (North Anna)
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