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A noncompliance of very low safety signifi … A noncompliance of very low safety significance with VCSNS Operating License Condition 2.C.(18) was identified for the licensees failure to protect or separate cabling associated with the Emergency Feedwater (EFW) pump discharge valve to the B Steam Generator routed through the Intermediate Building elevation 412 ft. (FZ IB- 25.1.2). The EFW pump discharge valve to the B Steam Generator was required to remain operational to achieve and maintain safe shutdown for a postulated fire in FZ IB- 25.1.2. The noncompliance met the criteria for NRC enforcement discretion. During review of procedure FEP-1.0, Enclosure B, Part 32, in conjunction with FEP-2.0, the team identified that the licensee utilized a local OMA to manually throttle open Air Operated Valve (AOV) IFV-3541 to prevent spurious operation due to potential fire damage during a postulated fire in FZ IB-25.1.2. AOV IFV-3541, the motor driven (MD) EFW pump discharge valve to the B Steam Generator, is normally open and is required to remain open to establish the EFW flowpath to the B Steam Generator from the MD EFW pumps. The FPER requires the A train (safe shutdown train) of EFW for SSD for a fire in FZ IB-25.1.2. Cables EFW102B and EFW146B for AOV IFV-3541 are located in IB-25.1.2 while the AOV itself is located on the mezzanine level of the adjacent FZ IB-25.1.3. This mezzanine is not physically independent of IB-25.1.2. The licensee failed to protect cables EFW102B and EFW146B from potential fire damage in IB-25.1.2. In lieu of protecting the required cables from fire damage, which could prevent modulation of the AOV and defeat the SSD strategy, the licensee instead took local control of the valve using a local OMA. The team performed a walk through of this local OMA to determine its feasibility per the criteria in Enclosure 2 to NRC IP 71111.05TTP, Fire Protection - NFPA 805 Transition Period (Triennial). Since the OMA would be performed in the adjacent FZ, smoke migration to this zone was a concern. The team determined the action to be feasible because the operator would be using a self-contained breathing apparatus (SCBA) and hand-held radio. Also, the two adjacent FZs are part of a very large FA, IB-25 (with a low fire hazard loading), and it would take time for a fire to grow large enough to create a significant amount of smoke where it could become a concern. Fire Area, IB-25.1.2 has area-wide automatic fire detection and suppression (sprinklers) which would most likely control the fire before damage to the cables would occur.e before damage to the cables would occur.

Discovered date

23:59:59, 30 June 2007 +

Docket

05000395 +

Event date

23:59:59, 30 June 2007 +

Finding integer

1 +

Finding type

Finding +

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Identified by

NRC identified +

Inspection procedure

IP 71111.05 + and IP 71111, Reactor Safety-Initiating Events, Mitigating Systems, Barrier Integrity +

Inspection report

IR 05000395/2007006 +

Inspector

N Merriweather +, G Wiseman +, Reinaldo Rodriguez +, D Payne +, B Mckay +, Keith Miller + and Sandra Walker +

Modification date"Modification date" is a predefined property that corresponds to the date of the last modification of a subject and is provided by <a rel="nofollow" class="external text" href="https://www.semantic-mediawiki.org/wiki/Help:Special_properties">Semantic MediaWiki</a>.

21:46:20, 8 October 2017 +

NFPA

NFPA 805 +

Person