05000425/FIN-2014003-04
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Inadequate Maintenance Procedures and Usage Results in a Failed MFRV and an Automatic Reactor Trip |
| Description | A self-revealing NCV of 10 CFR 50 Appendix B Criterion V, Instructions, Procedures, and Drawings, was identified for failure to provide adequate work instructions as well as failure to follow the maintenance procedure used to install flexible and rigid conduit. Specifically, the work instructions did not provide adequate directions and/or precautions to properly slope conduit during installation to prevent water intrusion into a valve positioner. The work instructions referenced maintenance procedure 25008- C, Flexible and Rigid Conduit Installation. The maintenance procedure referenced Vogtle design specification X3AR01 Section E-8, Raceway Systems, which provided sloping and tightness criteria for conduit installations. The licensee conducted a root cause investigation and entered the event into their corrective action program (CR 797929). The licensee repaired the improperly sloped conduit, replaced the positioner, and revised procedure 25008-C to specify standards for proper sloping of conduits. The finding was more than minor because it was associated with the procedure quality and human performance attributes of the reactor safety - initiating events cornerstone and it adversely affected the cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions during shutdown as well as power operations. Specifically, the failure to provide adequate work instructions as well as failure to follow procedure 25008-C, Flexible and Rigid Conduit Installation, resulted in the Unit 2 loop 3 main feedwater regulating valve (MFRV) positioner failing closed, causing a subsequent automatic reactor trip due to low-low steam generator (SG) water level. Because the inspectors answered No to all of the IMC 0609 Appendix A (dated June 19, 2012) Exhibit 1, Section B, Initiating Events Screening Questions, the inspectors concluded that the finding was of very low safety significance (Green). The inspectors determined that the finding had a cross-cutting aspect of procedure adherence in the human performance area because the maintenance electricians did not follow Vogtle design specification procedures or drawings resulting in the improper sloping of the MFRV flexible conduit. |
| Site: | Vogtle  |
|---|---|
| Report | IR 05000425/2014003 Section 4OA3 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | Self-revealing |
| Inspection Procedure: | IP 71153 |
| Inspectors (proximate) | A Alen A Nielsen C Dykes F Ehrhardt G Ottenberg M Cain M Speck S Sanchez T Chandler W Loo |
| Violation of: | 10 CFR 50 Appendix B Criterion V |
| CCA | H.8, Procedure Adherence |
| INPO aspect | WP.4 |
| ' | |
Finding - Vogtle - IR 05000425/2014003 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Vogtle) @ 2014Q2
Self-Identified List (Vogtle)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||