ML20113J205

Suppl 1 to Special Rept 92-004:on 920617,25,27 & 0706 & 17, Main Plan Vent High Range Process monitor,RMA-13 Declared Inoperable.Caused by Vibration from Abv Duct.Shock Mounts Installed on Detector Mounting

ML20113J205
Person / Time
Site:	Summer
Issue date:	07/31/1992
From:	Skolds J SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Ebneter S NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
92-004, 92-4, NUDOCS 9208070162
Download: ML20113J205 (2)

Text

.

South Cirdine Ehetric & G3 Comp:ny John L. Sk:Idr P O Box 88 Vice Presdrnt

" Jensansvihe. Sc 29065 Nuclear Operations 4803) 345 4040 SCE&G

. uom., ,

July 31, 1992 Mr. S. D. Ebneter

, Regional Administrator U. S. Nuclear Regulatory Commission tiegion II, Suite 2900 101 Marietta Street, NW Atlanta, GA 30323

Subject:

VIRGIL C. SUMMER NUCLEAR STATION 00CKET NO. 50/395 OPERATING LICENSE NO. NPF-12 SPECIAL REPORT 92-004 (SPR 920004)

SUPPLEMENT 1 South Carolina Electric & Gas Company submitted Special Report 92-004 on July 2, 1992, documenting the Main Plant Vent High Range Process Monitor, RMA-13, being inoperable due to spiking and spurious alarms. At the time of submittal, the cause of the spiking and spurious alarms had not been identified and it was noted that i supplement report would be submitted when the unit was repaired and returned tc service. As documented in the July 2, 1992, submittal, the monitor was declared inoperable on June 17, 1992, and declared operable on June 25, 1992. The monitor was again declared inoperable on June 27, '992,

. and was subsequently declared operable on July 6, 1992. On July 17, 1992, the monitor was again declared inoperable.

Extensive troubleshooting of the detector assembly, remote meter assembly, connectors and associated cable was performed and no electrical abnormality was identified. It was determined that vibration from the-Auxiliary Building ventilation duct was transmitted to the unit causing spurious operation at the low end of the instrument scale. To correct the condition, shock mount 3 were installed on the detector mounting to eliminate the vibration.

The unit was reinstalled, satisfactorily tested and was declared operable at 1830 hours0.0212 days <br />0.508 hours <br />0.00303 weeks <br />6.96315e-4 months <br /> or. July 30, 1992.

Should you have any questions, please contact Mr. R. J. Bouknight at 803-345-4085.

Very truly yours,

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John L. Skolds RJB:lcd c: See Page 2 Gnnn..

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c: 0. W. Dixon R. R. Mahan R. J. White i General Managers G. F. Wunder S. R. Hunt

HRC Resident Inspector J. B. Knotts Jr.

Marsh & McLennan

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1 HUCLEAR EXCELLENCE - A SUVMER-TRADITION!