ML20087B686

SR-S1-75-04:on 750730 & 0804,I-131 Activity Revealed to Be 8.04% of Tech Spec Limit.Caused by Containment Purging Operation & Fitting Leak on Overhead Gas Compressor. Containment Purge Terminated & Compressor Isolated

ML20087B686
Person / Time
Site:	Surry
Issue date:	09/15/1975
From:	Stallings C VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	Moseley N NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
SR-S1-75-04, SR-S1-75-4, NUDOCS 8403090342
Download: ML20087B686 (4)

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Mr. Norman C. Moseley, Director Serial No. 689 Office of Inspection and Enforcement P0&M/JTB:clw U.S. Nuclear Regulatory Cocatission Region II - Suite 818 Docket No. 50-280 230 Peachtree Street, Northwest License No. DPR-32 Atlanta, Georgia 30303

Dear Mr. Moseley:

Pursuant to Surry Power Station Technical Specification 6.6.B.3, the Virginia Electric and Power Company hereby submits forty (40) copies of Special Report No. SR-S1-75-04.

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 Euclear Safety and Operating Committee.

Very truly yours,

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J6.6 107. yJ/at6A d' C. M.' Stallings 9

Vice President-Power Supply and Production Operations Enclosures cc: Mr. K. R. Goller 39 copies SR-S1-75-04 O

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SPECIAL REPORT SR-SI-75-04 VENTILATION VENT GASEOUS RELEASE DOCKET NO. 50-280 LICENSE NO. DPR-32 SEPTEMBER 9, 1975 SURRY PO'JER STATION VIRGINIA ELECTRIC AND PO'JER COMPANY ,

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-1. INTRODUCTION In accordance with Technical Specification 6.6.B.3 for Surry Power Station, this report describes the release of gaseous vastes in excess of 4 per cent of the Technical Specification limits established by Technical Specification 3.11.B.1.

t II.

SUMMARY

OF OCCURRENCE On July 30, 1975, routine sampling of the ventilation vent gaseous activity revealed an Iodine-131 activity of 8.04 per cent of ' the Technical Specification lLait. The high Iodine-131 activity was attributed to Unit No. I containment purging operations during several days prior to July 30, 1975. Sampling frequency of ventilation vent gaseous activity was increased to once per day. Following the termination of purging operations, ventilation vent Iodine-131 activity declined to'5.7 per cent of the Technical Specification.

limit.

On the evening of August 3, 1975, ventilation vent gaseous activity began to rise again, reaching 8.25 per cent of the Technical. Spec 1fication limit.

This-increase has been attributed to a leaking fitting on the suction unloader to "B" overhead gas compressor. Following the isolation of the;affected gas compressor, ventilation vent Iodine-131 activity declined rapidly,. dropping below the14 per cent level on August 5, .1975. A'further description'of'the compressor fitting leak has been submitted as Abnormal Occurrence Report.

AO-S1-75-15.

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• s ' .e III. CONCLUSION The ventilation vent Iodine-131 activity exceeded 4 per ' cent of the Technical Specification limit on July 30, 1975 due to Unit No. I containment

, purging operations. This limit was again exceeded on August 4,1975 due to

a fitting leak on an overhead gas compressor. Unit No. 1 containment purge has been terminated and the affected_ compressor has been isolated. Ventilation vent Iodine-131 activity declined below 4 per cent of the Technical Specification i

limit on August 5,1975 and has returned to a constant-level of 2 to 3 per cent of the limit. ~

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