ML18046A973

Notifies That NRC 810521 Evaluation of SEP Topic III-7.C Re Delamination of Prestressed Concrete Containment Structures Is Still Valid,In Response to Util .Insp Is Only Way to Assure That Containment Dome Is Structurally Sound

ML18046A973
Person / Time
Site:	Palisades
Issue date:	10/19/1981
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
TASK-03-07.C, TASK-RR LSO5-81-10-034, NUDOCS 8110210285
Download: ML18046A973 (3)

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October 19, 1981

• Docket No. 50-255 LSOS 1 0-034 Mr. David P. Hoffman' Nuclear Licensing Administrator Consumers Powef"' Company 1945 W Parnall Road Jackson, Michigan 49201

SUBJECT:

SYSTEMATIC EVALUATION PROGRAM TOPIC llI-7.C, DELAMINATION OF PRESTRESSED CONCRETE CONTAINMENT STRUCTURE - PALISADES

References:

1) Draft evaluation on SEP Topic III-7.C from NRC to Consumers Power dated May 21, 1981

2) Response to draft evaluation on SEP Topic llI-7.C from Consumers Power to NRC dated July 21, 1981 By refe~nce (1), it was stated that the containment dome at Palisades should.

be 1nspe*cted periodically to -assure that no delami.natfon has occurred.

By reference (2), Consumers Power contended that this inspection was unnecessary

.and not feasible.

We have reviewed reference (2) and co~clude that our original evaluation is*

still valid.

In your response, you stated that the periodic leak rate tests, as required ~Y your technical specifications, verify the -integrity of the

• containment.

The leak rate tests are perfonned at 28 psig, approximately one-half of the design pressure, as stated in the Palisades technical specifications.

T~e leak rate test shows that the liner is intact at 28 psfg and does not prove that the dome concrete above the prestressfng wires is intact. It does not show that the cont~1nment can withstand all postulated loads (e.g., s~ismic, thermal, ful 1 pressure, etc.), only that ft can withstand one-half~§<_ the design pressure. Also, in your response, you felt that ft was unrea*sonable to inspect the dome because the dome exterf o~ surface f s covered with a 3 inch thick 1 ayer of urethane foam and that this must be removed to perfonn the

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J inspection. Additional infonnatfon supplied by your staff stated that most 5 ~/

of this insulation has been rempved and that your plans call for complete J/ I removal of the insulation.

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We conclude that our draft evaluation is final since inspection is the only An.1i

.way to be certain that the dome is sound. Therefore, our review of this topic

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,* NRC"FORM318 (10-80) NRCM0240

~c/ OFFICIAL RECORD COPY USGPO: 1981-33!;-960

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e. is complete and the previously issued evaluation will be a basic input to the integrated assessment of your facility. This topic assessment may be revised in the future if your facility design is changed;,pr 1f additional infonnation 1s provided to the staff.

Sincerely, i

Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing cc: See next page NRC FORM 318 (10-80) NRCM 0240 USGPO: 1981-335-960

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Mr. David P. Hoffman r

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M-.* 1.- Miller, Esquire~.

t:sham: Lincoln & Beale Suite 4200 One First National Plaza Chicago, Illinois 60670 Mr. Paul A. Perry, Secretary Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Judd L. Bacon, Esquire Consumers Power Company 212 West Michigan Avenue Jackson, Michigan 49201 Myron M. Cherry, Esquire

• Suite 4501 One IBM Plaza Chicago, Illinois 60611 Ms. Mary P. Sinclair Great Lakes Energy Alliance 5711 Summerset Drive Midland, Michigan 48640 Kalamazoo Public Library 315 South Rose Street Kalamazoo, Michigan -49006 Township Supervisor Covert Township Route l, Box 10

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Va.n Buren County, Michigan 49043 Office of the.Governor (2).

Room l ~ Capitol Building Lansing, Michigan 48913 Wil 1i am J. Scanlon, Esquire 2034 Pauline Boulevard Ann Arbor, Michigan 48103 Palisades Plant ATTN:

Mr. Robert Montross Plant Manager Covert, Michigan 49043

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Agency',: * ** *_:, - :~;;-:_ *::... ;*.:*... ::.*~*::-:. :. -~~,'

Federal Activities Branch Region V Office ATTN:

Regional ~diation Representative 230 South Dearborn Street

. Chicago, Illinois 60604 Charles Bechhoefer~ Esq., Chairman Atomic Safety and.Licensing Board Panel-U~ S. Nuclear Regulatory"-Con'inission Washington, D. c.' 20555 Dr. George C. Anderson Department of Oceanography University of Washington Seattle, Washington 98195 Dr. M. Stanley Livingston 1005 Calle targo-Santa Fe, New Mexico 87501 -

Resident Inspector c/o U. S. NRC Palisades Plant Route 2, P. O. Box 155 Covert, Michigan 49043

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