AECM-83-0468, RO83-066/0:on 830709 & 13,triaxial Peak Recording Accelerographs Used for Seismic Monitoring of Auxiliary Bldg Foundation & Reactor Vessel Support Failed Surveillance. Caused by Damage Apparently Incurred from Const Activity

RO83-066/0:on 830709 & 13,triaxial Peak Recording Accelerographs Used for Seismic Monitoring of Auxiliary Bldg Foundation & Reactor Vessel Support Failed Surveillance. Caused by Damage Apparently Incurred from Const Activity

ML20076F580
Person / Time
Site:	Grand Gulf
Issue date:	08/17/1983
From:	Dale L MISSISSIPPI POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
AECM-83-0468, RO-83-066-0, NUDOCS 8308260085
Download: ML20076F580 (2)

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MISSIS, IRPD POWER".& LIGHT COMPANY Helping $lilld Mississippi Emil&RauddB P. O. BOX 164 0 J AC K S ON, MIS SISSIP PI 3 92 05 NUCLEAR PRoDUCTON DEPARTMENT U. S. Nuclear Regulatory Commission Region II 101 Marietta St. , N.W. , Suite 2900 Atlanta, Georgia 30303 Attention: Mr. J. P. O'Reilly, Regional Administrator

SUBJECT:

Grand Gulf Nuclear Station Unit 1 Docket No. 50-416 License No. NPF-13 File 0260/L-835.0 Special Report 83-066/0 -

Seismic Monitoring Instrumentation Fails Surveillances AECM-83/0468 On July 9, 1983, the triaxial peak recording accelerograph used for seismic monitoring of the Auxiliary Building foundation (Technical Specification 3.3.7.2-1.2.b) failed its surveillance. The instrument was discovered damaged, apparently by recent construction activities.

On July 13, 1983, the triaxial peak recording accelerograph used for scismic monitoring of the reactor vessel support (Technical Specification 3.3.7.2-1.2.f) failed its surveillance. The instrument could not be adjusted into calibration tolerances.

Both instruments have been returned to the manufacturer for rework. New instruments have been ordered and are expected to be delivered prior to August 22, 1983. The instruments should be installed and calibrated prior to August 26, 1983.

This is reported pursuant to Technical Specification 6.9.2 as required by Technical Specification 3.3.7.2.a. The event had no affect on the health and anfety of the public and did not constitute a threat to plant safety.

Yours truly, L. F. Dale Manager of Nuclear Services EBS/SHH: sap cc: (See Next Page) OyF'M M' B308260085 830817 \D PDR ADOCK 05000416 S ... ember Middle South Utilities System

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. - AECM-83/0468 MICGI!CIPPI POWER O LIGHT COMPANY #E' cc: Mr. J. B. Richard Mr. R. B. McCchee Mr. T. B. Conner Mr. G. B. Taylor Mr. Richard C. DeYoung, Director Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 Document Control Desk U. S. Nuclear Regulatory Commission Washington, D. C. 20555

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