05000259/FIN-2015004-03
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Finding | |
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| Title | Corrective Actions For 2012 Flooding Walkdowns |
| Description | The inspectors identified an URI associated with potentially deficient flood barrier penetrations in the RHRSW rooms. The inspectors determined that several of the conditions had been previously identified by the licensee and entered into the CAP in November of 2012; however, the conditions had not yet been corrected.Description: Initially, the inspectors identified a potential flood barrier bypass in the B RHRSW room associated with a 2 inch diameter pipe that had significantly corroded an open area through the pipes wall. The inspectors reviewed the licensees response and discovered that an immediate operability determination was hampered because the pipe and valves were not marked or labeled and could not be located on any reviewed drawings. The issue was closed before resolving whether operability of the compartments pumps were affected. Upon additional questioning by the inspectors, the licensee reinitiated investigation of the issue. Since the pipes penetration points could not be readily determined, the licensee closed a manual isolation valve that was discovered upstream of the break in the pipe. Closure of the valve eliminated the potential immediate operability concern. The inspectors also identified that three other previously identified conditions had not been corrected in the B RHRSW room: 1) The B emergency equipment cooling water (EECW) strainer backwash valve conduit was severed where it penetrated the floor of the room, 2) There was an unsealed gap between a conduit sleeve and the enclosed conduit for powering the B1 RHRSW pump, 3) There was a 1/4 inch by 3/8 inch hole in a rubber boot at the B EECW discharge pipe floor penetration. Initial evaluations by the licensee determined that the first condition did not bypass the flood barriers and that the other two would potentially introduce flood water into the compartment at rate of 35 gallons per minute. This amount of inleakage was within the available pumping capacity of a single compartment sump pump and was not an immediate operability concern. However, the licensee has not yet evaluated the aggregate effect of all of the conditions concurrently. Because it is not yet clear whether the identified conditions could allow flood waters to bypass the RHRSW compartment flood barriers, more information is necessary to properly evaluate the licensees past operability evaluations, and the adequacy of the licensees corrective actions. Based on the available documentation of the walkdowns and corrective action documents, it was not clear to the inspectors how the licensee justified the reclassification of the conditions from initially unacceptable status to an indeterminate status and then finally to essentially acceptable status. Future inspection is required to determine if a more than minor performance deficiency or violation exists associated with these issues. Initial reviews have not identified any immediate safety concerns associated with the identified conditions. This issue has been entered in the licensees corrective action program as CRs 1070658, 1075911 and 1119892. (URI 05000259/260/296/2015-004-03, Corrective Actions For 2012 Flooding Walkdowns). These activities constituted four focused annual inspection samples, as defined in Inspection Procedure 71152. Documents reviewed are listed in the attachment. |
| Site: | Browns Ferry  |
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| Report | IR 05000259/2015004 Section 4OA2 |
| Date counted | Dec 31, 2015 (2015Q4) |
| Type: | URI: |
| cornerstone | Mitigating Systems |
| Identified by: | NRC identified |
| Inspection Procedure: | IP 71152 |
| Inspectors (proximate) | A Ruh D Dumbacher D Roberts R Baldwin T Stephena Mastersa Ruh D Retterer J Rivera R Taylor |
| INPO aspect | |
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Finding - Browns Ferry - IR 05000259/2015004 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Finding List (Browns Ferry) @ 2015Q4
Self-Identified List (Browns Ferry)
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