05000275/FIN-2011004-03
From kanterella
Jump to navigation
Jump to search
Finding | |
|---|---|
| Title | Failure to Maintain a Fire Barrier |
| Description | The inspectors identified a noncited violation of Diablo Canyon Facility Operating License Condition 2.C (4), Fire Protection, after the licensee failed to maintain the integrity of a fire barrier. On July 21, 2011, the inspectors identified that Fire Door B43-2, entrance to the Residual Heat Removal Pump Room 2-2, was inoperable. Equipment Control Guideline 18.7, Fire Rated Assemblies, required the licensee to maintain the fire barrier in the rated configuration or establish prescribed compensatory actions. The door was held open due to Auxiliary Building ventilation flow balance problems. The ventilation problems had affected the fire door since January 12, 2011. The inspectors performed an extent of condition evaluation and identified eight additional fire doors impacted by the flow balance problems. The licensee took immediate action to restore the fire door to the rated condition and entered the problem into the corrective action programs as Notification 50416374. The inspectors concluded that the failure of the licensee to maintain a fire door in the rated configuration was a performance deficiency. This finding was more than minor because the degraded fire barrier affected the Mitigating Systems Cornerstone external factors attribute objective to prevent undesirable consequences due to fire. The inspectors concluded that the finding was of very low safety significance (Green) because the licensee had maintained an automatic full area water-based fire suppression system in the exposed fire area. This finding had a crosscutting aspect in the area of problem identification and resolution, associated with the corrective action program component, because the licensee did not take timely corrective actions to correct Auxiliary Building ventilation flow balance issues |
| Site: | Diablo Canyon  |
|---|---|
| Report | IR 05000275/2011004 Section 1R05 |
| Date counted | Sep 30, 2011 (2011Q3) |
| Type: | NCV: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | G Guerra M Peck G Miller C Osterholtz E Ruesch D Reinert L Micewski |
| CCA | P.3, Resolution |
| INPO aspect | PI.3 |
| ' | |
Finding - Diablo Canyon - IR 05000275/2011004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Diablo Canyon) @ 2011Q3
Self-Identified List (Diablo Canyon)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||