05000263/FIN-2017010-01
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Finding | |
|---|---|
| Title | Failure to Ensure Adequate Design Controls During Installation of Flexible Hose on High Pressure Coolant Injection Auxiliary Oil System |
| Description | Green. A finding of very low safety significance and associated Non-Cited Violation (NCV) of Title 10 of the Code of Federal Regulations (10 CFR) Part 50, Appendix B, Criterion III, Design Control, was self-revealed as a result of an equipment cause investigation following failure of a pipe nipple in the safety-related piping for the HPCI system on March 22, 2016. Specifically, during original installation of the HPCI system, the licensee failed to correctly install a flexible hose to isolate vibrations in the system. Immediate corrective actions taken by the licensee included installing the flexible hose in the correct location to ensure isolation of vibrations in the system and performing walkdowns of other risk-significant systems to verify flexible hoses were installed in accordance with design. The issue was captured in the licensees corrective action program under CAP 1516361. 3 The inspector determined that the failure of the licensee to implement adequate design control measures and assure any deviations from Design Drawing NX82928 were properly controlled during installation of the flex ible hose in the HPCI system was contrary to 10 CFR Part 50, Appendix B, Criterion III, Design Control, and was a performance deficiency. The performance deficiency was determined to be more than minor, and thus a finding, because it was associated with the Mitigating Systems Cornerstone attribute of Design Control and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. Specifically, the licensees failure to install the flexible hose in the correct location in the HPCI oil system resulted in increased vibrations and loads throughout the HPCI system which had the potential to further degrade and decrease the reliability of the system. The finding was screened using Inspection Manual Chapter 0609, Appendix A, against the Mitigating Systems Cornerstone and determined to be of very low safety significance (Green), because the inspectors answered No to all of the questions in Exhibit 2, Mitigating Systems Screening Q uestions, Section A, Mitigating SSCs and Functionality. A cross-cutting aspect was not assigned to this finding since the performance deficiency occurred during the origi nal installation of the HPCI system and was determined not to be indicative of current licensee performance. |
| Site: | Monticello  |
|---|---|
| Report | IR 05000263/2017010 Section 4OA5 |
| Date counted | Jun 30, 2017 (2017Q2) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 2515/150 |
| Inspectors (proximate) | K Carrington B Dickson |
| Violation of: | 10 CFR 50 Appendix B 10 CFR 50 Appendix B Criterion III, Design Control |
| INPO aspect | |
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Finding - Monticello - IR 05000263/2017010 | |||||||||||||||||||||||||||||||||||||||||
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Finding List (Monticello) @ 2017Q2
Self-Identified List (Monticello)
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