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The team identified an unresolved item (UR … The team identified an unresolved item (URI) involving testing qualification documentation or evaluation for wall and floor fire barrier penetration seal configurations. Insufficient fire qualification test documentation or evaluations were available to qualify certain aluminum conduits that penetrate 3-hour fire rated barriers separating fire areas containing equipment required for safe shutdown. This issue was similar to one identified at Dominions Surry facility and documented in Section 1R05.02 of NRC Triennial Fire Protection Inspection Report Nos. 05000280,281/2009007 (ADAMS Accession No. ML092170680). During the 2009 NRC Triennial Fire Protection Inspection at Surry Nuclear Station it was identified that sufficient testing qualification or evaluation documentation did not exist to qualify the use of aluminum conduits with silicone foam seals configurations penetrating horizontal or vertical fire rated barriers. Subsequent to the Surry Triennial Fire Protection Inspection completed on June 26, 2009, NANS determined the issue to be applicable to North Anna Nuclear Station. The station staff entered the issue into corrective action program as CR342994 on June 29, 2009, to document the problem and further evaluate the extent of condition. The licensee is continuing walk downs of rated fire barriers and has established a plan for resolution of the issue. While inspecting the wall and floor fire barrier penetration seals, the team requested the licensees documentation for the qualification of penetration seal configurations. The specific seal configuration packages are documented in the attachment section of this report. The team reviewed the penetration seal criteria established in BTP CMEB 9.5-1which stated that openings through fire barriers which separate fire areas should be sealed or closed to provide a fire resistant rating at least equal to that required of the barrier. While reviewing this information, the team determined the documentation packages requested should have shown information to establish a 3-hour fire rating, since the rated fire barrier walls and floors separating the selected fire areas were required to have a 3-hour rating. In response, the licensee presented Installation Specification NAS-1024 for Silicone Foam in Fire Stops; Technical Report EP-0011;calculations 1250-111-C01, 1250-111-C03, 1250-111-C04; and, Engineering Transmittal ET CEP 00-0025 that included Penetration Seal Configuration Evaluations. The Dominion technical reports, calculations, and test reports applicable to the five basic silicone foam seal configurations were reviewed. The team determined that the NANS testing addressed aluminum cable trays, but not aluminum conduit penetrations through fire barriers. The concern is that aluminum melts at approximately 1220F, whereas the flame temperature used during fire testing is 1700F. Testing of penetration assemblies is performed using ASTM-E119. Steel conduit is not a concern, as it has a higher melting point (over 2000F).At the time of this report, the team did not have sufficient information to determine that acceptable qualification test results existed for NANS aluminum conduit penetration seal configurations. As a conservative measure, the licensee declared fire barriers with potential aluminum conduit penetrations inoperable, and established applicable compensatory measures in accordance with ET-CEP-09-0010, Rev. 1 for 20 fire areas. The team was aware that the fire barrier penetration seal configurations in question maybe qualified by existing nuclear industry penetration seal testing data which the licensee plans to conduct in early 2010. The team determined therefore, there was no immediate safety concern. This issue remains open pending NRC review of the final penetration seal qualification packages and will be identified as unresolved item (URI) 05000338,339/2009008-01, Qualification of Fire Barrier Floor/Wall Penetration of Aluminum Conduit Through Sleevetration of Aluminum Conduit Through Sleeve
23:59:59, 31 December 2009 +
23:59:59, 31 December 2009 +
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00:39:09, 21 February 2018 +
23:59:59, 31 December 2009 +
Safe Shutdown + and Fire Barrier +