ML19354E800

Forwards Addl Info Re Testing of Cable Vault C02 Suppression Sys During 891031-1102,per NRC 890518 & 0821 Requests.Encl Final Test Rept Demonstrates That Carbon Dioxide Sys Will Satisfy Design Bases for Greater than 10 Minutes in Room

ML19354E800
Person / Time
Site:	Vermont Yankee
Issue date:	01/16/1990
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML19354E801	List: ML19354E800 ML19354E802 ML19354E804 ML19354E807
References
BVY-90-006, BVY-90-6, NUDOCS 9002010376
Download: ML19354E800 (2)

Text

-

. . VERMONT YANKEE  !

' NUCLEAR POWER CORPORATION

.6 p

i S Ferry RCad, Brattleboro, VT 05301-7002

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ENGINEERING OFFICE i

'- f,60 MAIN $f Atti BOLToN. M A 01740 u.oe m m ii  ;

January 16, 1990 f

U.S. Nuclear Regulatory Commission i Washington, D.C. 20555 l Attention: Document Control Desk

References:

a) License No. DPR-28 (Docket No. 50-271) b) Letter, USNRC to VYNPC, NVY 89-108, dated 6/18/89 c) Letter, VYNPC to USNRC, BVY 89-48, dated 6/2/89 d) Letter, USNRC to VYNPC, NVY 89-172, dated 8/21/89 e) Letter, VYNPC to USNRC, BVY 89-101, dated 10/30/89 i

Subject:

Vermont Yankee Cable Vault CO2 Alternate Testing

• The purpose of this letter is to provide the additional information you  !'

requested regarding the testing of our Cable Vault CO2 Suppression System during the period October 31 - November 2, 1989, i As described during our telecon with your Mr. C. Anderson and Mr. D. Notley i on November 8, 1989, we performed alternate testing of this system. The  !

testing was conducted with the support of RETROTEC Energy Innovations Limited and demonstrated that the installed Carbon Dioxide Suppression System will, if  !

required, operate as designed. During the above referenced telecon, we for-warded preliminary test results and informed you that on this basis we would t declare the subject system operable. In addition, as we agreed, a once per two '

hour " Fire Watch" has been implemented as a compensatory measure until a final ,

test report was received from the vendor and the NRC had the opportunity to review this document and our assessment of the test results.

l The final test report is provided as Attachment A to this letter. The pre-liminary test report and calculations for which our preliminary determination i (and our November 8, 1989 telecon) was based is also provided as Attachment B. -l The test reports demonstrate that the pressures developed as a result of the dynamic discharge are low and that the structural integrity of the enclosure i will not be compromised. It also. demonstrates that the Carbon Dioxide System will satisfy the design bases by providing a 50% concentration of CO2 for greater than ten minutes throughout the room. l l

Based upon the testing performed and the attached supporting reports, we  !

have confirmed that we have a fully operable Cable Vault CO2 Fire Suppression i system that will operate as designed. ,

1 9002010376 900116 PDR b bp'M[I P ADOCK 05000271 i 2

PDC , \ }

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'.,, VERMONT YANKEE NUCLEAR POWE',7 CORPORATION I l

U.S Nuclear Regulatory Commission C

January 16, 1990 Page 2 I l

l 2

l We trust this information responds to your concerns regarding the operabi- 1 lity of our Cable Vault 002 system; however, should you have any questions or require additional information concerning this matter, please do not hesitate to contact us.

Very truly yours,  !

VERMONT YANKEE NUCLEAR POWER CORPORATION f ~

WarrenP. Murphy /j ,

Vice President anF  ;

Manager of Operations

/dm cc: USNRC Regional Admi,- trator, Region I USNRC Resident Inspector, VYNPS USNRC Project Manager, VYNPS l

i