ML20125C968

Forwards Request for Addl Sys Info Re Containment Purging, Including Provisions to Ensure Insolation Valve Closure Will Not Be Prevented by Debris Entrained in Escaping Air & Steam

ML20125C968
Person / Time
Site:	Vermont Yankee
Issue date:	11/17/1979
From:	Ippolito T Office of Nuclear Reactor Regulation
To:	Groce R YANKEE ATOMIC ELECTRIC CO.
References
NUDOCS 8001110680
Download: ML20125C968 (3)

Text

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/ I%, UNITED STATES y '-( e g NUCLEAR REGULATORY COMMISSION 3 E WASHINGTON, D. C. 20555

/ November 17, 1979 Docket No. 50-271 Mr. Robert H. Groce .

Licensing Engineer Yankee Atomic Electric Company 20 Turnpike Road Westboro, Massachusetts 01581

Dear fir. Groce:

We are reviewing your submittal dated January 9,1979 in response to our letter dated November 29, 1978 concerning containment purging.

As a result of our review to date, we have determined that the additional systems informaticn requested in the enclosure is necessary in order for us to complete our long term containment purge and venting system safety evaluation. please provide answers to these questions within 45 days

, of receipt of this letter.

We have not yet completed our review of the mechanical, electrical and instrumentation aspects of containment purge, but we expect that we may have additional questions for you in these areas.

Sincerely, n " '

d#

Thoma' . Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors

Enclosure:

Request for Additional Information cc w/ enclosure:

see page 2 90022294 l

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Mr. Robert H. Groce Yankee Atomic Electric Comoany 2-D"" 0 6^ n * - -

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CC:

Ms. J. M. Abbey Joh ~. Stan on, Director Vermont Yankee Nuclear Pcwer Rad' aron Contr:1 Agency Corporation Hazen : rive 77 Grove Street Concord, New Harpshire 03301 Rutland, Vermont 05701 John W. Stevens Mr. Donald E. Vandenburgh, Consertation So:iety of

'Vice President 50ut ern Verment Vermont Yankee Nuclear Power P. 2. Box 255 i

Corporation Towr. stand , Verm:nt 05353

, Turnpike Road, Route 9

< Westboro, Massachusetts 01551 Dr. Ma s Longley, Direct:r Divisi:n Occupa-ional Health John A. Ritsher, Escuire 32 Spa;1 ding Street i Ropes & Gray Barre, Verront 05641 225 Franklin Street Boston, Massachusetts 02110 New Er;1and Coa'ition on Nuclear Pollation Laurie Burt Hill and Dale Farm I Assistant Attorney, General West Efil - Faraway Road Environmental Protection Division Putney, Verment 05346 i Attorney General's Office One Ashburton Place,19th Floor Public Service Board

! Boston Massachusetts 02108 State :f Vennent 120 State Stree-Richard E. Ayres, Escuire Mon pe'ier, Vernon: 05602 Natural Resources Defense Counsel -

917 15th Street, N. W. W. 2 :or.way, P' ant Superintendent Washington, D. C. 20005 Ve rmor: Yankee 'iuclear Peser C:r;:ratic ,

Honorable M. Jerome Diamond P. 2. Iox 157 Attorney General Verr.or., Vennent 05354 State of Vermont 109 State Street Mr. Charles Shetetoff Pavilion Office Building Assistant Direc or Montpelier, Vermont 05602 Ver or- Puolic :nterest

esearch Grou:, Inc.

Anthony Z. Roisman 25 Sta e Street Natural Resources Defense C0uncil Mor.; e*ier, .er ent C56:2 91715th Street, N. W.

Washington, D. C. 20005 Br::ks v e : 'al ' ibra y 22' .a ' . S t r e e t 5 a ' t::-:, Ve- :rt 052:1 90022295 I

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r REQUEST FOR ADDITIONAL INF0FF.AT*:S FOR CONTAINMENT PURGE SYSTEY. A%3 CCNTAINMENT VENTING SYSTEM F0E D VERF.JNT YANKEE NUCLEAR POWER PL'.NT DOCKET NO. 50-271

1. With regard to the containment purge and venting system, provide the following infonnation:

a. Discuss the provisions made to ensure tha isciation valve closure will not be p'revented by debris w-icn could poten-tially become entrained in the escaping a'r ar.d steam.

b. Discuss the provisions made for testing t e availability of the isolation function and the leakage rz:e o' the isolation valves, individually, during reactor operatier..

c. Quantify the amount of containrent atrcsp ere released through the purge and vent isolation ' valves fc- a s:e:: rum of break sizes during the maximum closure time ali wed in your Technical Speci fications .

Provide an analysis to demonstrate the ac:eptabilit' of the d.

provisions made to protect structures and safety-related equipment; e.g., fans , filters, and du:tw:rk, located beyond the purge system isolation valves against loss of function from the environment created by the es:a:f n; air and steam. ,

e. For the cor. ainment purge isolation valves, s:e:ify the differ-ential pressuae across the valve for mi:. -he maximum leak rate occurs. Further, provide tes t resu' s (e.g., from vendor tests of leakage rate versus valve ciffe-er.:ial pressure) which support tne above information.

l 90022296 ,

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