ML20082P894

Special Rept:On 910722,seismic Monitoring Triaxial time-history Accelograph 2ENV-XT-823-2 Found Inoperable. Preliminary Trouble Shooting Indicated Open Circuit in Connector.Repair Deferred Until Refueling Outage Scheduled

ML20082P894
Person / Time
Site:	Brunswick
Issue date:	09/05/1991
From:	Spencer J CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9109110135
Download: ML20082P894 (1)

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1" CP&L_

Carolina Power & Light Company

, Brunswick Nuclear Project P. O. Lox 10429 South >ott, N.C. 28461 0429 i beptember5,1991 FILE: B09 135100 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 BRUNSWICK STEM ELECTRIC PLANT UNIT 2 DOCKET NO. 50-324 LICENSE NO. DPR 62 i SPECIAL REPORT PER TECilNICAL SPECIFICATION 3.3.5.1 AND

! PURSUANT TO TECilNICAL SPECIFICATION 6.9.2 (2 SR-91 0021 Centlemen:

At approximately 1215 hours0.0141 days <br />0.338 hours <br />0.00201 weeks <br />4.623075e-4 months <br /> (EST) on July 22, 1991, Seismic Monitorjng Triaxial Time History Accolograph 2 ENV XT-823 2 was found inoperable during performance of the Seismic Monitoring System Channel Check and Functional Test, 2MST SEIS11M.

The Tech ical Specificatio'n 31 day Limiting Condition for Operation A2 91 1207 expired.on August 22, 1991, prior to plant conditions allowing repair, without a largo personnel radiation exposure or shutting down the reactor. Preliminary trouble shooting had indicated an open circuit in the connector between the 89 -

accelerometer r,ad thu pull box. The Unit 1 Seismic Monitor is still available as an on site seismic monitor even if it does not cover the operability requirements of the Unit 2 seismic monitor.

The accelerometer location, on the Unit 2 Reactor Building 89' outside drywell vall, has dose rates of 150 to 200 mR/hr gamma and 150 to 200 mrem /hr neutron when the reactor is at power, verses 2 to 3 mrem /hr when shutdown, licalth Physics i

proj ected the dose for completing the estimated 10 hour1.157407e-4 days <br />0.00278 hours <br />1.653439e-5 weeks <br />3.805e-6 months <br /> repair o f' the accelerometer cable, with possible splice, to be 3 to 4 Person Rem. In order to avoid high exposure while it power, the repair will be deferred until the Unit 2 refuellng outage schcoultd to start Septemoer 11, 1991.

Additionally, Engineering Work Request 08086 is proposing a minor modification to the cabling that would install a bulk head connector inside the pull box. This I

enhancement will eliminate the need for the splice in the pullbox and simplify future repair efforts.

i Very truly yours MQ l- . '. Spencer,- emeral Manager I nswick Nuclear Project i

cc: Mr. . S. D. rbneter ~

Mr. N. B.  ;

BSEP NRC Resident Office l

I~

9109110135 910905 PDR- ADOCK 0D000324 S PDR MM

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