ML20212A193

Special Rept Spr 86-009:on 860616,RMA-14,noble Gas Effluent Monitor on Reactor Bldg Purge Supply & Exhaust Sys,Declared Inoperable Due to Spiking Above High Radiation Setpoint W/No Detectable Radiation Present

ML20212A193
Person / Time
Site:	Summer
Issue date:	06/30/1986
From:	Nauman D SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Grace J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
REF-PT21-86-285-000 PT21-86-285, PT21-86-285-000, SPR-86-009, SPR-86-9, NUDOCS 8607280136
Download: ML20212A193 (2)

Text

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e 5 na Electric & Ga2 Company n a n Columbia. SC 29218 Nuclear Op3 rations (803) 748-3513 SCE&G June 30, 1986 c

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< ro Dr. J. Nelson Grace 2; Regional Administrator -

U. S. Nuclear Regulatory Commission Region II, Suite 2900 '_'

101 Marietta Street, N.W.

Atlanta, Georgia 30323

SUBJECT:

Virgil C. Summer Nuclear Station Docket No. 50/395 Operating License No. NPF-12 Special Report (SPR 86-009)

Dear Dr. Grace:

Attached is a Special Report for the Virgil C. Summer Nuclear Station.

This report is submitted pursuant to the requirements of Technical Specification 3.3.3.1, Table 3.3-6 Action Statement 30, Item 2, and Technical Specification 6.9.2.

Should there be any questions, please call us at your convenience.

Very truly yours,

. D. A. Nauman l

l RMF: DAN / led j Attachment pc: 0. W. Dixon, Jr./T. C. Nichols, Jr. K. E. Nodland E.,H. Crews, Jr. R. A. Stough E. C. Roberts G. O. Percival J. G. Connelly, Jr. R. L. Prevatte W. A. Williams, Jr. J. B. Knotts, Jr.

Group Managers S. D. Hogge

0. S. Bradham I&E Washington D. R. Moore Document Management C. A. Price Branch W. T. Frady INP0 Records Center

C. L. Ligon (NSRC) ANI Library R. M. Campbell NPCF File 8607280136 860630 PDR ADOCK 05000395 S PDR 1.EIC

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Dr. J. Nelson Grace SPR 86-009 June 30, 1986 ENCLOSURE 1 EVENT DESCRIPTION On June 16, 1986, RMA-14, the Noble Gas Effluent Monitor on the Reactor Building Purge Supply and Exhaust System, was declared inoperable due to spiking above the high radiation setpoint with no detectable radiation present.

ACTION TAKEN The channel was not returned to an operable status in 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />; therefore, the preplanned alternate method of monitoring was implemented.

The cause of the inoperability was determined to be an adjustment problem in the timing circuit of the auxiliary circuit board. The necessary adjustments were made and the channel was returned to service on June 29, 1986.