ML19332A375

Forwards Request for Addl Info Re Bypass & Reset of Engineered Safety Features Per Review of 790113 & 1220 Submittals.Requests Response within 30 Days

ML19332A375
Person / Time
Site:	North Anna
Issue date:	07/10/1980
From:	Clark R Office of Nuclear Reactor Regulation
To:	Ferguson J VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
References
NUDOCS 8009110610
Download: ML19332A375 (4)

Text

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UNITED STATES

> [ h e r)~,,g NUCLEAR REGULATORY COMMISSION

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WASHINGTON, D. C. 20555 JUL 101980 e

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Decket No. 50-338 Mr. J. H.~Ferguson Exccutive Vice President, Power Virginia Electric and Power Company P. O. Box 26666 Richmona, Virginia 23261

Dear Mr. Ferguson:

We have reviewed your submittals of January 13, 1979 and December 20, 1979 regarding the bypass and resetting of engineered safety features (ESP) actuation signals.

Our review has also included information as documented in the FSAR for North Anna, Unit 1.

Our review indicates that additional information as provided in the enclosure to this letter is required in order for us to complete our. review.

We request that your response to the enclosure be submitted within 30 days receipt of this letter.

Please inform us within seven dt.ys after receipt of this letter of your confirmation of our requested response date or the date you will be able to meet.

Sincerely, Robert A. Clark Ch ef Operating Reactors Branch #3-Division of Licensing

Enclosure:

Request for Additional Information l

cc w/ enclosure:

See next page i

8009r10 h @

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Mr. J. H. Ferguson Virginia Electric and Power Conpany cc: Richard M. Foster, Esquire Mrs. June Allen 1230 A Pearl Street 412 Cwens 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 Un1versity 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 COORDINATOR 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 Comonwealth of Virginia Director, Technical Assessment Divisic 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

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Mr. W. R. Cartwright, Station Manager 1

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 General Philadelphia, Pennsylvania 19104 11 South 12th Street - Room 308 Richmond, Virginia 23219 Atomic Safety and Licensing Appeal Board Panel U. S. Nuclear Regulatory Cocmission l

Mr. Allan Tattersall Washington, D. C.

205co Resident Inspector / North Anna c/o U.S. NRC P. O. Box 128 i

Spotsylvania, Virginia 22553 b

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NORTH ANNA UNIT 1 RE00EST FOR ADDITIONAL INFORFATION BYPASS AND RESET OF ENGINEERED SAFETY FEATURES 1.

The information presented in your FSAR and your letters of January 17, 1979 and December 20, 1979, is not sufficient to dstermine 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 folicwing:

Criterion 1 - In keeping with the requirements of General Design Criteria 55 and 56, the overridinga 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 containmen+. high pressure is not a portion of safety injection actuation) should automatically initiate containment ventilation isolation.

Criterion 5 - The instrumentation and control systems provided to initiate the ESF should be designed and qualified as safety grade l

equipment.

b Criterion 6 - The overriding or resetting of the ESF actuation signal should not cause any valve or damper to change position, Tne 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 - Reset:

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

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J 2.

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

(1)

Provide a tabulation of the following 'nformation for each valve or damper in the Containment Depressurization, Contain-ment Atmosphere Cleanup, and Habitability (i.e., control 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 sional sources

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e.

Reference 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 ci rcui try.

(2)

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

(e.g., relays,- contacts, swi tches, diodes, etc.).

i (3)

For each manual override feature identified in 2.(1) above, provide a description of the pnysical feature (s) furnished to prevent inadvertent operation and to satisfy the require-ments of Criterien 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 requirements, and compenent qualification standards involved to ensure that the systems will perform their designated safety function upon demand.

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