ENS 44929

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v t e ENS Event
12:31 Mar 23, 2009
Title	Non-Functional Steam Exclusion Barrier
Event Description	{{#Wiki_filter:On 3/23/09 at 0731 an I&C Supervisor transiting though a steam exclusion double door found the door sweep misaligned causing one side to catch and stick open. This prevented the door from closing automatically until the sweep was readjusted back to its original position. The door was then closed and monitored while permanent repairs took place. While the door was open and could not close automatically, the barrier was Non-Functional for Steam Exclusion. In accordance with TRM 3.0.9 Section A.1 all equipment supported by that steam exclusion barrier was immediately declared inoperable. This zone includes both trains of ECCS and support equipment (i.e., SI, RFIR, ICS, CCW, etc ). TS 3.0.c was entered and exited during the time the door could have stuck open (6 minutes) with both trains of ECCS inoperable. Permanent repairs were completed on the door at 0809 on 3/23/09. Therefore, this is reportable under 10 CFR 50.72 (b)(3)(v), 'Any event or condition that at the time of discovery could have prevented the fulfillment of a safety function, and under 10 CFR 50.72(b)(3)(ii)(B) 'any event or condition that results in the nuclear plant being in an unanalyzed condition that significantly degrades plant safety.' The licensee is also reporting this event under 10 CFR 50.72 (b)(3)(v)(D), Accident Mitigation. The licensee notified the NRC Resident Inspector. * * UPDATE FROM STEVE TAYLOR TO JOE O'HARA AT 1443 ON 05/18/09 * * * 05/18/2009 - Retraction of EN # 44929. Non�Functional Steam Exclusion Barrier. EN # 44929 provided notification that both trains of ESF equipment (e.g. SI, RHR, CCW, etc ) were inoperable due to degradation of a steam exclusion boundary door in the auxiliary building on March 23, 2009. Subsequent engineering evaluation determined that the degraded door remained capable of fulfilling its steam exclusion function during the brief (eight minute) period when it was degraded. The door had become degraded while being used for routine transit when the lower door sweep became misaligned, thereby preventing the door from completely closing. However, an engineering evaluation determined that the resulting gap was sufficiently small such that the total allowed leak path criteria were not exceeded. Additionally, the door swing was in the direction of postulated steam flow, such that the door would have been held in the closed direction by any steam overpressure postulated under accident conditions. Therefore, the door remained functional and the supported ESF equipment in the auxiliary building remained operable. Consequently, this condition did not meet the reportability criteria in 10 CFR 50.72. As a result, the notification made on 03/23/2009 is hereby retracted. The licensee notified the NRC Resident Inspector. Notified the R3DO(R. Skokowski). }}

ENS 44929 +/-
Where
Kewaunee Wisconsin (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
Time - Person (Reporting Time:+-1.58 h-0.0658 days <br />-0.0094 weeks <br />-0.00216 months <br />)
Opened:	Andrew Smolinski 10:56 Mar 23, 2009
NRC Officer:	Vince Klco
Last Updated:	May 18, 2009
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v • d • e

v t e Emergency Notification System
Kewaunee with 10 CFR 50.72(b)(3)(v)(A), Loss of Safety Function - Shutdown the Reactor, 10 CFR 50.72(b)(3)(v)(B), Loss of Safety Function - Remove Residual Heat, 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition, 10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material
WEEKMONTHYEAR2012-08-20T16:00:00 [Table view]
[ENS list for Kewaunee]

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