05000327/FIN-2016007-04
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Failure to Energize Hydrogen Igniters during Extended Station Blackout |
| Description | The NRC identified a finding (FIN) for the licensees failure to meet their docketed commitment to revise the back-up generators to include supplying one train of containment hydrogen igniters per unit in response to Generic Safety Issue 189, Susceptibility of Ice Condenser and Mark III Containments to Early Failure from Hydrogen Combustion During a Severe Accident. The licensee entered this issue into their corrective action program and completed immediate corrective actions to revise procedure FSI-5.01, Initial Assessment and Flex Equipment Deployment, Rev. 0, to ensure the hydrogen igniters would be energized during an extended station blackout (SBO) event. The performance deficiency was determined to be more than minor because it was associated with the Procedure Quality attribute of the Barrier Integrity Cornerstone and adversely affected the cornerstone objective of providing reasonable assurance that physical barriers protect the public from radionuclide releases caused by accidents or events. Specifically, the failure to energize the hydrogen igniters during an extended SBO event could result in containment failure. The team determined the finding to be of very low safety significance (Green) because the risk was mitigated by the low frequency of SBO conditions and the high likelihood of operator recovery given the obvious diagnosis of the performance deficiency. The team determined the finding was indicative of present licensee performance and was associated with the cross-cutting aspect of operating experience (OE), in the area of Problem Identification and Resolution, because the licensee failed to effectively collect, evaluate, and implement relevant internal OE before implementing their new station procedures to use the FLEX diesels as the power supply to the hydrogen igniters. |
| Site: | Sequoyah  |
|---|---|
| Report | IR 05000327/2016007 Section 1R21 |
| Date counted | Jun 30, 2016 (2016Q2) |
| Type: | Finding: Green |
| cornerstone | Barrier Integrity |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.21 |
| Inspectors (proximate) | B Bishop G Ottenberg J Bartley M Riley M Yeminy O Mazzoni R Patterson |
| CCA | P.5, Operating Experience |
| INPO aspect | CL.1 |
| ' | |
Finding - Sequoyah - IR 05000327/2016007 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Sequoyah) @ 2016Q2
Self-Identified List (Sequoyah)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||