ML20087C178

SR-S1-75-03:on 750709,I-131 Activity Found to Be 4.6% of Tech Spec Limit.Caused by Containment Purging Operations & Containment Maint Activities.Containment Purge Exhaust Diverted Through Charcoal Filter Sys

ML20087C178
Person / Time
Site:	Surry
Issue date:	07/25/1975
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
SR-S1-75-03, SR-S1-75-3, NUDOCS 8403120348
Download: ML20087C178 (4)

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I;.'. *- D;*r i f,b Mr. Norman C. Mosclcy, Director Serial No. 612 Office of Inspection and Enforcement P0&M/JTB:clw U.S. Nuclear Regulatory Commission Region 11 - Suite 818 Docket No. 50-280 230 Peachtree Street, Northuest License No. DPR-32 Atlanta, Georgia 30303

Dear Mr. Moseley:

Pursuant to Surry Power Station Technical Specification 3.11.B.1 the Virginia- Electric and Power Company hereby submits forty (40) copies of Special Report No. SR-SI-75-03.

The substance of this report has been reviewed by the Station Nuclear '

Safety and Operating Committee and will be placed on the agenda for the next meeting of the System Nuclear Safety and Operating Committee.

Very truly yours, y ,

, ww f/ h C. M.fbli s j Vice President-p wer Supply j and Producbion Operations l Enclosure t

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SPECIAL REPORT I

SR-SI-75-03 VENTILATION VENT GASEOUS ACTIVITY

_ DOCKET 1:0. 50-280 LICENSE 1:0. DPR-32 JULY 22, 1975 SURRY POWER STATION VIRGINIA ELECTRIC AND POWER COMPANY l

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o o I. INTRODUCTION-In accordance with Technical Specification 6.6.B.3 for Surry Power Station, this report describes the release of gaseous wastes in excess of 4 per cent of the Technical Specification limit trstablished by Technical Specification 3.11.B.1.

II. SU)!>fARY OF OCCURRENCE On July 9,1975, routine sampling of the ventilation vent activity i

revealed an Iodine-131 activity of 4.6 per cent of the Technical Specification limit. Purging operations and maintenance activitics associated with Unit No. 2 shutdown are believed to have icd to the increase in the icyc1 of activity in the ventilation vent. This, in conjunction with the existing auxiliary building activity 1cvels due to the processing of liquid waste, raised the total vent activity above the 4 per cent limit. In order to j reduce the icvel of activity in the ventilation vent, the containment purge exhaust was diverted through the charcoal filter system. Subsequent sampling on July 10, 1975 indicated the operation had reduced the level of I-131 activity to approximately 2.9 per cent of the Technidal-Specification limit, a value consistent with previous icvels immediately prior to the shutdown.

III. CONCI,USION The excess ventilation vent 1-131 activity was believed to be. caused

.by containment-purging operations and containment maintenance activitics with some contribution from processing liquid waste. The activityLwas

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4 C) . O redoced below the 4 per cent limit by diverting the containment purge exhaust through the charcoal filter system. Procedure changes have been

- implemented _to ensure all future containment purges are directed through the charcoal filters.

The releases described herein were well below the limits established by 10 CFR 20; therefore, there were no safety implications associated with

. the occurrence.

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