ML19095A802

Submit Special Report No. SR-S1-75-04 Re Ventilation Vent Gaseous Release

ML19095A802
Person / Time
Site:	Surry
Issue date:	09/15/1975
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	Moseley N NRC/RGN-II
References
Serial No. 689 LER 1975-004-00
Download: ML19095A802 (4)

Text

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Mr~ Norman C. i1oseiey~ **Director

• _'serial *No. 689

'* Offic¢ of. Inspection'*and Enforc.ement; *. *po&}f/JTB~clw* **.: *

• U.S. *Nuclear Regulatqry Commission *:.:**. *

.Region: II -

• Suite* 8.18 .; . .

• Docke{ :lilo ~. 50-280 230 Peach,tre~ :street,: Northwest~ . Licens~No. DPR:-32*

. Atlanta, Georgia .* .30303 . :;- *. :

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Dear* .Mr. Moseiey:

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• _Purauant 0.t;o. Suri-y Powe~ .-~t;ati~n:;T~c~ical* _Specif:Lcat"!on,*--6;,,6!B;_3,. the

• Virginia Ele~:tric-** an:d -Power- Cpmpany .-he:t.-eby::.submits

• forty_-_*. (40) .::copies of .. *.

• Speci~_l-R~port ~U,~*'SR-S1~7,s;o4. * :'_: \*-' .. -* .* *

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,The s~bstanc~ ~f ihit- report

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.*Safety:and Operating; C~ittee :and. \dll. be: pl~ced on the agenda for- the

. 'next meeting* of the System Nuclear-,Safety and Opera.ting comni:Ltt'ee;

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C. M. Stallings V:lcii* Preaident;:,.Power' Supply *

. and:-, Production Operations' . --

Enclosures cc: *Mr *. K.* R>*:Go.ller v'/.:

• 39 copies- SR-:-Si-75~04*_ *:.:,),,*

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SPECIAL REPORT VENTILATION VENT GASEOUS RELEASE DOCKET NO. 50-280 LICENSE NO. DPR-32 SEPTEMBER 9, 1975 SURRY POWER STATION VIRGINIA ELECTRIC AHD POWER COMPANY

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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 limits established by Technical Specification 3.11.B.1.

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 limit. The high Iodine-131 activity was attributed to Unit No. 1 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 Specification limit.

This increase has been attributed to a leaking fitting on the suction unloader to "B 11 overhead gas compressor. Following the isolation of the affected gas compressor, ventilation vent Iodine-131 activity declined rapidly, dropping below the 4 per cent level on August 5, 1975. A further description of the*

compressor fitting leak has been submitted as Abnormal Occurrence Repo1:t AO-Sl-75-15.

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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. 1 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 limit on August 5, 197 5 and has returned to a- constant level of 2 to 3 per cent of the limit.