05000498/FIN-2012005-03
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Finding | |
|---|---|
| Title | Failure to Maintain Adequate Fire Penetration Seal Material Thickness |
| Description | The inspectors identified a non-cited violation of Technical Specification 6.8.1.d, Fire Protection Program Implementation, for the failure to follow work order package instructions requiring the use of Drawing C012-00081-F7F, Detail E-1 Silicone Elastomer Typical Electrical Pen. Seals (Walls & Floors), to establish 6 inches of fire retardant sealant material for penetrations in Units 1 and 2. The inspectors noticed that Unit 1 train B safety-related 4160 Vac switchgear room electrical penetration F4476 had gaps around the edge. A design change installed new electrical cables that required the penetration be sealed using work order package 139376, that stated the penetration seal WILL BE IAW the Penetration Seal Permit and detail Drawing C012-00081-F7F. During the repair activities to correct the gaps, it was discovered that a portion of the seal was only 4.5 inches. The licensee captured this issue as Condition Report 12-28283. Corrective actions included restoring the seal to 6 inches, performing additional analysis to support a 3-hour fire barrier with just 5 inches, and performing extent of condition inspections. The finding was more than minor because it was associated with the Initiating Events Cornerstone attributes of Design Control and Procedure Quality, and affected the cornerstone objective to limit the likelihood of events that upset plant stability and challenge critical safety functions because it resulted in multiple fire penetration seals being declared nonfunctional as a result of being less than the design thickness. The inspectors used Manual Chapter 0609, Attachment 0609.04, to determine that fire protection issues are processed through Appendix F, Fire Protection Significance Determination Process, dated February 28, 2005. The inspectors used Appendix F, Attachment 1, to determine that the finding was of very low safety significance because it was a Moderate A fire confinement issue that screened out using Task 1.3.2 questions, since the seals would still have provided a 2-hour fire endurance rating or a 20 minute fire endurance rating without the seal being subject to direct flame impingement. In addition, this finding had human performance cross-cutting aspects associated with work practices because the licensee did not communicate human error prevention techniques such as self and peer checking, commensurate with the risk, such that the work activity was performed safely |
| Site: | South Texas  |
|---|---|
| Report | IR 05000498/2012005 Section 4OA2 |
| Date counted | Dec 31, 2012 (2012Q4) |
| Type: | NCV: Green |
| cornerstone | Initiating Events |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | J Dixon K Clayton G Guerra B Tharakan L Carson W Walker W Sifre R Azua |
| CCA | H.12, Avoid Complacency |
| INPO aspect | QA.4 |
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Finding - South Texas - IR 05000498/2012005 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (South Texas) @ 2012Q4
Self-Identified List (South Texas)
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