05000323/FIN-2016004-01
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Finding | |
|---|---|
| Title | Failure to Follow Maintenance Procedure Resulted in Improper Configuration of Safety Related Equipment |
| Description | Green. The inspectors identified a non-cited violation of Technical Specification 5.4.1.a,Procedures, for the failure to follow Procedure AD7.ID16, Tool Pouch and Minor Maintenance Program, Revision 2. Specifically, the licensee failed to screen work on the safety-related rupture restraint as acceptable to be worked as tool pouch work or minor maintenance. As a result, a safety-related main steam line rupture restraint (MS-41RR) was not properly returned to service and left in an inoperable condition following maintenance. As corrective actions, the licensee returned MS-41RR to an operable condition and initiated a review of the maintenance database to ensure that work performed on main steam line rupture restraints is completed in accordance with appropriate written inspections. The licensee entered the issue into their corrective action program as Notifications 50872133,50872056, and 50872789. The failure to properly preplan and perform maintenance affecting the performance of safety-related equipment was a performance deficiency. The inspectors determined that the finding was more than minor because it was associated with the configuration control attribute of the Mitigating System Cornerstone and adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesired consequences. Specifically, because of not following maintenance procedures, a safety-related main steam rupture restraint was left in a disengaged or inactive configuration such that following a postulated line break, the main steam line would be unrestrained. This resulted in a potential of high-energy pipe impacting structures and components designed to be protected from high-energy pipe whip. Using IMC 0609, Appendix A, The Significance Determination Process for Findings At-Power, Exhibit 2, Mitigating Systems Screening Questions, the inspectors determined the finding was of very low safety significance (Green) because the finding did not represent an actual loss of function of a mitigating system. Specifically, the single restraint condition would only affect a very limited range of breaks and no risk significant systems would be adversely impacted. The inspectors concluded that this finding affected the cross cutting area of human performance, documentation, because the licensee did not maintain up to date documentation to ensure work planning on safety related equipment are complete, thorough, accurate, and current such that main steam pipe restraints are maintained within design requirements [H.7]. |
| Site: | Diablo Canyon  |
|---|---|
| Report | IR 05000323/2016004 Section 1R12 |
| Date counted | Dec 31, 2016 (2016Q4) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.12 |
| Inspectors (proximate) | C Newport E Ruesch E Schrader J Groom J Reynoso M Phalen P Elkmann S Graves |
| Violation of: | Technical Specification |
| CCA | H.7, Documentation |
| INPO aspect | WP.3 |
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Finding - Diablo Canyon - IR 05000323/2016004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Diablo Canyon) @ 2016Q4
Self-Identified List (Diablo Canyon)
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