ML19323B073

Responds to Request for Statement on Inflatable Door Seals in Personnel Airlocks.Inflatable Seals Must Meet safety- Grade Criteria for Active Components Including Single Active Failure & Redundancy.Request for Addl Info Encl

ML19323B073
Person / Time
Site:	McGuire, Mcguire
Issue date:	04/11/1980
From:	Denise R Office of Nuclear Reactor Regulation
To:	Varga S Office of Nuclear Reactor Regulation
Shared Package
ML19323B072	List: ML19323B071 ML19323B073
References
NUDOCS 8005090212
Download: ML19323B073 (4)

Text

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WASHING TON. D. C. 20555

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AFR 111980

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MEMORANDUM FOR:

S. A. Varga, Acting Assistant Director for Light Water Reactors, DPM FROM:

R. P. Denise, Acting Assistant Director for Reactor Safety, DSS SUB1ECT:

PERSONNEL AIRLOCK DOOR SEAL DESIGN, MCGUIRE, UNITS 1 AND 2

REFERENCE:

Memorandum, J. C. Glynn to W. R. Butler, "IE Region IV Vendor Inspection Branch's Concern with the South Texas Units 1 & 2 Personnel Airlock Seal Design," March 19, 1980 The Office of Inspection and Enforcement (I&E), through the referenced memo-randum, has infonned us that inflatable door seals in lieu of the more corrrnon passive compressible seals for personnel airlocks are being used at the South Texas plant.

I&E requested a statement of the NRR position on the licensing bases for this design.

Inflatable seals, unlike the much more common passive compressible seals, involve the use of active components that must meet certain safety grade criteria, e.g., single active failure criteria and redundancy re-qui remen ts. We. have found that among the NT0L plants, McGuire is one that uses inflatable door seals. Since our prior reviews have not focused on this design, we propose to obtain additional information so that an appropriate review can be accomplished.

Enclosed is a request for additional infon:ation on this subject, so that we may determine whether the design for McGuire meets our requirements.

At present, we are aware of three plants that have inflatable door seals, i.e.,

McGuire, South Texas, and Grand Gulf.

Depending on the outcome of this review on McGuire, we may later make similar requests for informat'on for the other plants (South Texas and Grand Gulf).

D Richard P. Denise, Acting Assistant Director for Reactor Safety Division of Systems Safety

Enclosure:

As stated cc:

R. Baer

] R. Birkel

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J. Glynn Y. Huang W. Butler i

W. Milstead l

J. Kudrick M. Fields J. Pulsipher

Contact:

J. Pulsipher, CSB: DSS 29498 l

o 1

Personnel Airlock Door Seals It has come to our attention that certain plants under construction, particularly South Texas, plan to use personnel airlocks with inflatable docr seals.

Inflat-able door seals, unlike passive compressible door seals, invoiva the use of ac-tive components. These active components must meet certain safety design criteria, e.g., single active failure criteria and redundancy requirements. We understand that the McGuire plant also uses inflatable door seals; therefore, provide the following infonnation:

1.

Provide detailed drawings of the personnel airlock door seals and p&I dia-grams of the compressed air systems that will maintain the pressure in the l

inflated seals during nonnal operating and accident conditions.

Include diagrams of the control and indication systems involved with th.ese seal systems.

2.

Describe the operation of the seal systens during nonnal operating and acci-dent conditions.

Give the design requirements for the systems, including seismic and environmental qualification, quality assurance requirements, and safety-grade classification.

3.

Describe the provisions for protection against single active failures in the seal systems.

Discuss the consequences of loss of power, i.e., loss of offsite power, loss of all AC power, or loss of DC power. Note whether sys-tem failures are indicated and alarmed in the main control room.

Discuss backup seal pressurization systems, such as compressed air or nitrogen tanks, and whether such backup systems have the capacity to assure door seal integrity for extended periods during and following an accident, assuming certain failures, e.g., loss of power.

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1 Mr. William 0. Parker, Jr.

'Vice President, Steam Preduction

@ Duke Power Company y

P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 cc:

Mr. W. L. Porter Duke Power Company P. O. Box 2178 422 South Church Street Charlotte, North Carolina 28242 Mr. R. S. Howard Westinghouse Electric Corporation Power Systems Division P. O. Box 355 Pittsburgh, Pennsylvania 15230 Mr. E. J. Keith EDS Nuclear Incorporated 220 Montgomery Street San Francisco, California 94104 i.,,

Mr. J. E. Houghtaling i'

NUS Corporation 2536 Countryside Boulevard Clearwater, Florida 33515 Mr. Jesse L. Riley, President The Carolina Environmental Study Group 854 Henley Place Charlotte, North Carolina 28207

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J. Michael McGarry, III, Esq.

Debevoise & Liberman

$tr.

1200 Seventeenth Street, N. W.

Washington, D. C.

20036

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Rober t M. Lazo, Esq., Chairman Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Dr. Emmeth A. Luebke Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission r

Washington, D. C.

20555 Dr. Cadet H. Hand, Jr., Direct:r Bodega Marine Lab of California P. O. Box 247 Bodega Bay, California 94923 e

Mr. William 0. Parker, Jr.

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.-cc: David Flesichaker, Esq.

1735 Eye Street. 16. W.,

Suite 109 Washington, D. C.

20006 Richard P. Wilson, Esq.

Assistant Attorney General State of South Carolina 2600 Bull Street Columbia, South Carolina 29201

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