05000259/FIN-2014005-02
Finding | |
|---|---|
| Title | Failure to Demonstrate Satisfactory Performance of the Automatic Depressurization System Air Accumulators |
| Description | A self-revealing non-cited violation (NCV) of 10 CFR 50, Appendix B, Criterion XI, Test Control, was identified for the licensees failure to have a test program that assured testing would verify Unit 1 Automatic Depressurization System (ADS) valve 1-PCV-1-19 would perform satisfactorily in service. Specifically, the licensee failed to verify and check the proper configuration and performance of ADS valve 1-PCV-1-19 with a satisfactory post maintenance test as required by NPG-SPP-06.3, Pre/Post-Maintenance Testing. On October 30, 2014 operators discovered that valve 1-PCV-1-19 would no
open as required. Troubleshooting revealed that the control air line accumulator to 1-PCV-1-19 was misconfigured and aligned instead to, non-ADS, steam relief valve 1-PCV-1-18. The licensee entered into the licensees corrective action program as PER 952082. The finding was more than minor because it was associated with the mitigating systems cornerstone attribute of Configuration Control, and adversely affected the cornerstone objective to ensure the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the failure t perform an adequate post maintenance test prevented the discovery of the improper installation of ADS valve 1-PCV-1-19 control air line and allowed the inoperability of the valve to exist undetected during plant operation. Using IMC 0609.04, Initial Characterization of Findings and IMC 0609 Appendix A, Exhibit 2 Mitigating Systems screening questions, the finding screened as very low safety significance (Green). The finding did not represent an actual loss of function of a single train for greater than it technical specification allowed outage time and did not represent an actual loss of function of one or more non-technical specification equipment for greater than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. This finding does not have a cross-cutting aspect because the lack of proper post maintenance testing to verify the configuration of the ADS air line was made in November 2006 and was not reflective of current performance. |
| Site: | Browns Ferry  |
|---|---|
| Report | IR 05000259/2014005 Section 1R19 |
| Date counted | Dec 31, 2014 (2014Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71111.19 |
| Inspectors (proximate) | R Baldwin S Morrow T Stephen A Ruh C Scott D Dumbacher J Hamman L Jarriel M Coursey M King P Cooper |
| Violation of: | 10 CFR 50 Appendix B Criterion XI Technical Specification |
| INPO aspect | |
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Finding - Browns Ferry - IR 05000259/2014005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2014Q4
Self-Identified List (Browns Ferry)
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