ML20028H396

LER 90-032-01:on 901021,discovered That Five Snubbers Removed from Standby Svc Water Sys Piping in Violation of Tech Spec 3.7.4.Caused by Scheduling Error & Inadequate Review.Training Will Be Completed on 910331.W/901218 Ltr

ML20028H396
Person / Time
Site:	River Bend
Issue date:	12/18/1990
From:	England L, Odell W GULF STATES UTILITIES CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
LER-90-032, LER-90-32, RBG-34180, NUDOCS 9101020312
Download: ML20028H396 (4)

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Decemter 18, 1990 RBG- 34180 File 16s. G9.5, G9.25.1.3 U.S. Nuclear Rc911atory Ccanission tb;:umnt Control Denk Washington, D.C. 20555 Gentlu mnt River Ibnd Station - Unit 1 Ixcket Ib. 50-458 Plc asc find enclosed Revision 1 to Licensco Ivent Report No.90-032 for River Bend Station - Unit 1. This report is being sutadtted pursuant to 10CITt50.73.

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W.11. Odell Manager-Oversigri River Ibnd Nuclear Groc" I : 'IX [ WrI/ch cci U.S. Nuclear Regulatory Ccunission 611 Ryan Plaza Drive, suite 1000 Aclington, TX 76011 NRC Resident Inspector P.O. Box 1051 St. Francisville, IA 70775 INIV Records Center 1100 Circle 75 Parkway Atlanta, CA 30339-3064 Mr. C. R. Oberg l}j Public Utility Ccanission of Texas l 7800 Shoal Creek Blvd., Suite 400 lbrth Austin, TX 78757 9101020312 901218 -

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i i i on October 21, 1990 with the reactor in Operational condition 5 (Refueling), it was discovered that five snubbers were removed from standby service water system piping that was required to be operable. One of these enubbers was removed for a time period exceeding the action statement of Technical Specification 3.7.4.

Therefore, this report is submitted pursuant to 10CFR50.73 (a) (2) (i) (B) as operation prohibited by the Technical Specifications.

This event was caused by three factors: (1) A scheduling error, (2) Limited system knowledge by the work coordinator, and (3)

Inadequate review by the administrative control operating foreman. Training on this will be provided by March 31, 1991 for applicable personnel.

During this event, the affected piping was not subjected to any of the dynamic events for which the subject snubber is required.

Consequently, the integrity of the piping has not been compromised. Therefore, this event did not adversely affect the health and safety of the public.

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0l 1 Oj 2 or 0l3 nxiw ,ua.. ,e w - ,o m eum. m emn REPORTED CONDITION On October 21, ]990 with the reactor in Operational Condition 5 (Refu. ling), it was discovered that five snubbers were removed from standby service water system piping that was required to be operable.

One of these snubbers was removed for a time period exceeding the action statement of Technical Specification 3.7.4. Therefore, this report is submitted pursuant to 10CFR50.73 (a) (2) (i) (B) as operation prohibited by the Technical Specifications.

INVESTIGATION This event was caused by three factors. First, a scheduling error placed these snubbers on the work schedule while Divisions I and III were required to be operable. Second, the in-service inspection (ISI) coordinator had limited knowledge of the cystem alignments. Finally, the administrative control operating foreman (ADM-COF) did not adequately review the work packages and thus did not realize that the snubbers were to be removed from operable equipment.

The work packages associated with the subject snubbers were released for work on October 8, 1990. The packager were then brought to the tagging official, at which time the ISI coordinator requested a clearance for normc1 service water pumps PIA, P1B, Plc. The request was accepted and the clearance was implemented later that day. The packages were then presented to the ADM-COF, who released them for work. The packages were not documented on an active or tracking limiting condition for operation (LCO). Neither the tagging official, nor the ADM-COF recognized that the snubbers were to be removed from a system required to be operable.

The five snubbers are attached to piping that is supplied by the normal service water system during routine operations. However, this event occurred while the piping was being supplied by the standby service water system. Standby service water was also required to be operable for the shutdown cooling mode of the residual heat removal system. For these reasons, tasks requiring snubber removal are typically scheduled according to the time interval or " window" that the corresponding division will be out of service. A scheduling error placed these snubbers on the work schedule during the Division II window.

At 0200 on October 13, the snubber associated with maintenance work order request (MWOR) 107155 was removed and was functionally tested at 0656 that day. This snubour was reinstalled on October 17 in violation of the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> time limit of the action statement of TS 3.7.4. The four remaining snubbers were removed on October 18 and 19 and reinstalled, prior to exceeding the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> action time, on October 19 and October 20, respectively, hRC ,erm 366A 66491

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0l3 l 2 O1j Oj3 or 0l3 tert m m w.  % .= .m ime in ms .om On October 21, while performing his review, the administrative control operating foreman discovere.1 that the snubbcr associated with MWOR 137155 had been removed from standby service water piping downstream of the Division III HPCS diesel generator. The remaining snubber packages were located, and the status was assessed. All the snubbers were found to be installed.

A review of previous LERs revealed no similar events.

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_ CORRECTIVE ACTION Training on this event will be provided for outage management, ISI, and Operations personnel. This training will be completed by March 31, 1991.

SAFETY ASSESSMENT Four of the five snubbers were reinstalled and returned to operable status within the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> time period allowed in Technical Specification 3/4.7.4. The fifth snubber, located downstream of the Division III HPCS diesel service water piping, was removed for approximately 111 hours0.00128 days <br />0.0308 hours <br />1.835317e-4 weeks <br />4.22355e-5 months <br /> (39 hours4.513889e-4 days <br />0.0108 hours <br />6.448413e-5 weeks <br />1.48395e-5 months <br /> longer than the 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> allowed).

During that time, the piping was not subjected to any of the dynamic events (i.e., fluid transient or seismic activity) for which the subject snubber is required. Consequently, the integrity of the piping has not been compromised. Therefore, this event did not adversely affect the health and safety of the public.

NOTE: Energy Industry Identification System Codes are identified in the text as (*XX*).

NT.C Pete 366A 16496