ML19330C298

Forwards Request for Addl Info Re Override of Containment Purge & Other Engineered Safety Feature Actuation Signals. Sufficient Physical Features Should Be Provided to Facilitate Adequate Administrative Controls

ML19330C298
Person / Time
Site:	North Anna
Issue date:	07/25/1980
From:	Novak T Office of Nuclear Reactor Regulation
To:	Ferguson J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
References
NUDOCS 8008080198
Download: ML19330C298 (4)

Text

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UNITED STATES

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<g NUCLEAR REGULATORY COMMISSI.ON r.

j wAswsworos, o. c.2 osse JUL 2 51980 737 Docket No. 50-30&

Mr. J. H. Ferguson Executive Vice President - Power Virginia Electric and Power Coripany Post Office Box 26666 Richmond, Virginia 23261

SUBJECT:

OVERRIDE OF CONTAINMENT PURGE AND OTHER ESF ACTUATION SIGNALS -

NORTH ANNA, UNIT 1 In our review of the generic task as noted in the subject above, we find that additional information is required as provided in the Enclosure to this letter.

This information is required in order that we may coriplete our review of these matters. We request that your response be provided within 30 days receipt of this letter. Please inform us within seven days after receipt of this letter of your confirmation of our requested response date or the date you will be able to meet.

Sincerely,

D29eo/

Thomas Novak, Assistant Director for Operating Reactors Division of Licensing

Enclosure:

As stated cc w/ enclosure:

See next page 8008080NI p

i

Mr. J. H. Ferguson

- Virginia Electric and Fower Cogany cc: Richard M. Foster, Esquire Mrs. June Allen 1230 A Pearl Street 412 Owens Drive Denver, Colorado 80203 Huntsville, Alabama 35801 Michael W. Maupin, Esquire Mr. James Torson Hunton, Williams, Gay and Gibson 501 Leroy P. O. Box 1535 Socorro, New Mexico 87801 Richmond, Virginia 23212 Mrs. Margaret Dietrich Alderman Library Route 2, Box 568 Manuscripts Department Gordonsville, Virginia 22042 University of Virginia Charlottesville Virginia 22901 Mr. James C. Dunstance State Corporation Comission Mr. Edward Kube Comonwealth of Virginia Board of Supervisors Blandon Building Louisa County Courthouse Richmond, Virginia 23209 P. O. Box 27 '

Louisa, Virginia 23093 U. S. Environmental Protection Agency Region III Office Ellyn R. Weiss, Esquire ATTN: EIS C0ORDINATOR Sheldon, Harmon, Roisman and Weiss Curtis Building 1725 I Street, N.W., Suite 506 6th and Walnut Streets Washington, D. C.

20006 Philadelphia, Pennsylvania 19106 Commonwealth of Virginia Director, Technical Assessment Divisio Council on the Environment Office of Radiation Programs (AW-459) 903 Ninth Street Office Building U. S. Environmental Protection Agency Richmond, Virginia 23129 Crystal Mall #2 Arlington, Virginia 20460 Mr. W. R. Cartwright, Station Manager P. O. Box 402 Mr. Paul W. Purdom Mineral, Virginia 23117 Environmental Studies Institute Drexel University Mr. Anthony Gambardella 32nd and Chestnut Streets Office of the Attorney Ceneral Philadelphia, Pennsylvania 19104 11 South 12th Street - Room 308 Richmond, Virginia 23219 Atomic Safety and Licensing Appeal Board Panel t

U. S. Nuclear Regulatory Ccmission Mr. Allan Tattersall Washington, D. C.

20555 Resident Inspector / North Anna c/o U.S. NRC l

P. O. Box 128 l

Spotsylvania, Virginia 22553 i

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thbLV#.M NORTH ANNA UNIT 1.

REQUEST FOR ADDITIONAL INFORPATION BYPAS5 AND RESET OF ENGINEERED SAFETY FEATURES

=

1.

The infomation presented in your FSAR and your letters of January 17, 1979 and December 20, 1979, is not sufficient to determine if the following requirements are met for the safety signals to all Engineered Safety Features (ESF) equipment. Therefore, identify and justify all exceptions to the following:

Criterion 1 - In keeping with the requirements of General Design Criteria 55 and 56, the overridings of one type of safety actuation signal, e.g., radiation, should not cause the blocking of any other type of safety actuation signal, e.g., pressure, for those valves that have no function besides containment isolation.

Criterion 2

' Sufficient physical features e.g., key lock switches, are to be provided to facilitate adequate administrative controls.

Criterion 3 - A system level annunciation of the overridden status should be provided for every safety system impacted'when any override is active.

(See R.G. 1.47.)

Criterion 4 - Diverse signals should be provided to initiate isolation of the containment ventilation system. Specifically, containment high radiation, safety injection actuation, and containment high pressure (where containment high pressure is not a portion of safety injection actuation) should automatically initiate containmen,t ventilation isolatien.

Criterton 5 - The instrumentation and control systems provided to initiate the ESF should be designed and qualified as safety grade equipment.

b of the ESF actuation Criterion 6 - The overriding er resetting signal should not cause any valve or damper to change position.

The following definitions are given for clarity of use:

a - Override:~ the signal is still present, and it is blocked in order to perform a function contrary to the signal. The term " override" where used in this Request for Information, includes functionally equivalent techniques of signal modification, e.g., " bypass."

b

. Re$st:

the signal has come and gone, and the circuit is being Bea7ed in order to return it to normal condition.

I

\\

O 2.

In addition to responding to the general ques, tion above, please provide the following specific infomation:

(1)' Provide a tabulation of the following information for each valve or damper in the Containment Depressurization, Contain-ment Atmosphere Cleanup, and Habitability (i.e., centrol room) Systems which operate automatically following an accident:

a.

Component designation b.

System served c.

Safety function, e.g., containment isolation, spray initiation d.

Actuation signal sources -

e.

F.eference to control circuitry (see 2.(3) below) f.

Indication whether or not the component safety function indicated in 2.(1) above can be defeated through the use of a manual override in either the control system or actuation signal system circuitry.

(2)

For each actuation signal system and ccmponent actuation system identified in 2.(1)d and 2.(1)e above, incorporating a manual reset or override feature, provide a complete circuit descrip-tion, including detailed diagrammatic information (i.e., as-built circuit diagram, schematics, logics) sufficient to allow a thercugh understanding of the operation of such circuitry, including the function and effect of all centrol devices

-(e.g., relays,. contacts, switches, diodes, etc.).

(3)

For each manual override feature identified in 2.(1)- above, provide a description of the physical feature (s) furnished to prevent inadvertent operation and to satisfy the require-ments of Criterion 2 above (IEEE Std. 279-1971, Section 4.14).

(4)

For each actuation signal identified in 2.(1)d above, identify the design standards, quality assurance require ents, and component qualification standards involved to ensure that the systems will perform their designated safety function upon demand.

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