05000280/FIN-2009007-01
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Finding | |
|---|---|
| Title | Qualification of Fire Barrier Floor/Wall Penetration of Aluminum Conduit Through Sleeve |
| Description | The team identified an unresolved item (URI) involving the qualification documentation for wall and floor fire barrier penetration seals. While inspecting the wall and floor fire barrier penetration seals, the team requested the licensees documentation for the qualification of a particular penetration seal configuration. That configuration was for one aluminum schedule 40 conduit (of various sizes as applicable) penetrating a 6 in. diameter floor or wall sleeve where the floor or wall was of poured concrete construction and the sleeve void around the conduit was filled with foamed silicon to the thickness of the floor or wall. The documentation package requested should establish a 3-hour fire rating, since the rated fire barrier walls and floors were required to have a 3-hour rating. In response, the licensee presented Impell Corporation Calculation No. 1250-111-C01, Penetration Seal Configuration Documentation Package, 10 in. Dow Corning Q3-6548 Silicone RTV Sealing Foam/North Anna and Surry, Rev.1. The qualification package or calculation was based on a tested configuration similar to that described above, except that the conduit was 3 in. or 4 in. galvanized steel. The team informed the licensee that this calculation was not valid to qualify aluminum conduit due to the lower melting temperature and greater heat conductance of aluminum as compared to steel. The licensee later transmitted supplemental information which included a fire barrier penetration seal fire test report for large diameter aluminum conduits through a sleeve. This new information was not a formal calculation comparing it to any installed penetration seal configuration at Surry. Moreover, certain aspects of the test data such as the temperature rise on the unexposed surfaces may not meet the licensing basis. At the time of issuance of this report, the team did not have sufficient information to determine the design criteria of that penetration seal. The team was aware that the fire barrier penetration seal configurations in question could probably be qualified by existing nuclear industry penetration seal testing data; therefore, there was no immediate safety concern. The licensee Initiated CR 339567 with an action item to establish a valid qualification package for the penetration configuration described above. URI 05000280, 281/2009007-01, Qualification of Fire Barrier Floor/Wall Penetration of Aluminum Conduit Through Sleeve, was established to track this issue until the final qualification package is reviewed |
| Site: | Surry  |
|---|---|
| Report | IR 05000280/2009007 Section 1R05 |
| Date counted | Jun 30, 2009 (2009Q2) |
| Type: | URI: Green |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | M Endress R Rodriguez T Morrissey J Nadel L Lake R Carrion G Mccoy R Clagg M Coursey C Fletcher B Collins J Montgomery C Jones G Sandeln Merriweatherp Fillion R Nease L Suggs K Miller |
| INPO aspect | |
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Finding - Surry - IR 05000280/2009007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Surry) @ 2009Q2
Self-Identified List (Surry)
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