ML19309D654
| ML19309D654 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 03/12/1980 |
| From: | Ippolito T Office of Nuclear Reactor Regulation |
| To: | Rich Smith VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 8004110084 | |
| Download: ML19309D654 (4) | |
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UNITED STATES y
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,,o March 12, 1980 Docket No. 50-271 Mr. Robert L. Smith Licensing Engineer Vermont Yankee Nuclear Power Corporation 25 Research Drive Westboro, Massachusetts 01581
Dear Mr. Smith:
In response to our letters dated November 29, 1978 and November 9, 1979, you provided by letters dated January 9 and December 27, 1979, infomation related to the containment purge system. We have ident-ified the enclosed additional information as being required so that we can complete our evaluation of the electrical / bypass aspects of the containment purge issue. The review of other aspects of the containment purge issue are proceeding separately.
Please provide the infomation in the enclosure within thirty days of receipt of this letter.
Sincerely,
)
Thoma ' A. Ippolito, Chief Operating Reactors Branch #3 Division of Operating Reactors
Enclosure:
Request for Additional Information cc w/ enclosure:
See page 2 800411008Q
Mr. Robert L. Smith cc:
3 Ms. J. M. Abbey John R. Stanton, Director Vermont Yankee Nuclear Power Radiation Control Agency Corporation Hazen Drive 77 Grove Street Concord, New Hampshire 03301 Rutland, Vermont 05701 John W. Stevens Mr. Donald E. Vandenburgh, Conservation Society of Vice President Southern Vermont Vermont Yankee Nuclear Power P. O. Box 256 Corporation Townshend, Vermont 05353 Turnpike Road, Route 9
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Westboro, Massachusetts 01581 Dr. Mars Longley, Director Occupational & Radiological Health John A. Ritsher, Esquire 10 Baldwin Street Ropes & Gray Montpelier, Vermont 05602 225 Franklin Street Boston, Massachusetts 02110
' ew England Coalition on Nuclear N
Pollution Laurie Burt Hill and Dale Farm Assistant Attorney, General West Hill - Faraway Road Environmental Protection Division Putney, Vermont 05346 Attorney General's Office
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One Ashburton Place, 19th Floor Public Service Board Boston Massachusetts 02108 State of Vermont 120 State Street Ronald J. Wilson Montpelier, Vermont 05602 81018th Street, N. W.
Suite 802 W. F. Conway, Plant Superintendent Washington, D. C.
20006 Vennont Yankee Nuclear Power Corporation Honorable M. Jerome Diamond P. O. Box 157 Attorney General Vernon, Vermont 05354 State of Vermont 109 State Street Mr. Charles Sheketoff Pavilion Office Building Assistant Director Montpelier, Vermont 05602 Vermont Public Interest Research Group, Inc.
Mr. J. E. Griffin, President 26 State Street Vermont Yankee Nuclear Power Montpelier, Vermont 05602 Corporation 77 "",vs Street Brooks Memorial Library Rut
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ENCLOSURE
..i REQUEST FOR ADDITIONAL INFORMATION FOR BYPASS AND RESET OF ENGINEERED SAFETY FEATURES FOR VERMONT YANKEE DOCKET NO. 50!271 1.
The information presented in your FSAR and your letters of January 9, and December 27. 1979
, is not sufficient to determine if the following requirements are met for the safety signals to all Engineered Safety Features (ESF) equipnent.
Therefore, identify and justify all exceptions to the following:
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 'isol' tion '~ ~~ ~""~
a 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 CVI.
Criterion 5 - The instrumentation and control systems provided to initiate the ESF should be designed and qualified as safety grade equipment, i
Criterion 6 - The overriding or resettingb of the ESF actuation signal should not cause any valve or damper to change position.
2.
In addition to responding to the general que(tion above, please provide the following specific information:
I Tne following definitions are given for clarity of use in this evaluation:
a - Override: the signal is still present, and it is blocked in order t
to perform a function contrary to the signal.
b - Reset:
the signal has come and gone, and the circuit is being cleared in order to return it to the normal condition.
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. (1) Provide an "as built" tabulation of all Engineered Safety Features (ESF)/ Auxiliary Supporting Features (ASF) valves and dampers required to be operated automatically following an accident.
This tabulation should include the following:
a.
Component designation b.
System served c.
Safety function (e.g., containment isolation, spray initiation) d.
Actuation signal sources 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 or bypass in either the control system or actuation signal system circuitry.
(2) For each manual bypass or override feature identified in 2(1) above, provide a description of the physical feature (s) provided to prevent inadvertant operation and to satisfy the requirements of IEEE Std. 279-1971 Section 4.14.
(3) For each actuation signal system and component actuation system identified in 2(1)d and 2(1)e above, incorporating a manual reset, override or bypass feature, provide a complete circuit description, including detailed pictorial infomation (i.e., as built circuit --
diagram, schematics, logics), sufficient to allow a thorough understanding of the operation of such circuitry including the function and effec t of all control devices (e.g., relays, contacts, switches, diodes,etc.).
(4) For each actuation signal identified in 2(1) above, identify the design standards, quality assurance requirements, and component qualification standards involved to ensure that the systems will perform their designated safety function upon demand.
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