05000416/FIN-2014007-02
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Finding | |
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| Title | Possible Loss of Communication Systems During Control Room Fire Scenarios |
| Description | The licensee developed Engineering Report GGNS-EE-11-00001, GGNS Appendix R Safe Shutdown Analysis (FPP-1), Revision 0, to document a revalidation of the post-fire safe shutdown analysis. This analysis described three different intraplant communications systems. These systems included the radio system, public address system, and sound-powered telephones. The licensee provided a summary of the communications systems, but did not provide a detailed evaluation of the availability of the communications systems during control room fire scenarios. The licensee noted that two of the inverter cabinets for the public address system were included in the safe shutdown equipment list, but were not credited to provide communications for safe shutdown since the sound-powered telephones or hand-held radios could also be used. The licensee concluded that because of the diverse and overlapping coverage of the intraplant communications systems, it is reasonable to conclude that adequate communications will remain available. Based on discussions with site communications personnel, the team determined that a fire-induced short in the radio system control console cable could key the repeater, preventing the operators and fire brigade from using the radio system. The licensee noted that the control console was connected via a phone line, and operators could mitigate this scenario by cutting the telephone cables in the radio repeater room (located outside the control room). During a walkdown of the alternative shutdown procedure, the team confirmed that public address system handsets were located in all areas that required communications between operators, but the team identified that sound-powered telephone jacks were not located in the Division I diesel generator room. The team noted that the alternative shutdown procedure required communications between the operators performing steps at the diesel generator and the switchgear during the time critical actions. Because the public address system had circuits and equipment located in the control room, the team was concerned that a control room fire could possibly disable both the radio system and the public address system. Since the sound-powered telephone jacks were not provided in all areas that required communications between operators, the team was concerned that the licensee may not have sufficient communications capability for all control room fire scenarios. The team required additional information in order to resolve this concern. Specifically, the team required an evaluation of the public address system circuits and equipment in the control room to determine if a control room fire could disable the radio system and the public address system. The licensee entered these issues of concern into the corrective action program as Condition Report CR-GG-2014-03803. These issues of concern are being treated as an Unresolved Item 05000416/2014007-02, Possible Loss of Communications Systems During Control Room Fire Scenarios. |
| Site: | Grand Gulf  |
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| Report | IR 05000416/2014007 Section 1R05 |
| Date counted | Jun 30, 2014 (2014Q2) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71111.05 |
| Inspectors (proximate) | J Dixon J Mateychick N Okonkwo S Alferink S Gravesn Taylorr Alexander G Warnick J Mateychick L Carson M Schwieg M Young N Day |
| INPO aspect | |
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Finding - Grand Gulf - IR 05000416/2014007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Grand Gulf) @ 2014Q2
Self-Identified List (Grand Gulf)
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