ML17319B159
| ML17319B159 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 12/17/1981 |
| From: | Miner S Office of Nuclear Reactor Regulation |
| To: | Dolan J INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG |
| References | |
| NUDOCS 8201300083 | |
| Download: ML17319B159 (7) | |
Text
o DEC 3.q
'l981 Docket Nos.
50-315 and 50-316 Mr. John Dolan, Vice President Indiana and Michigan Electric Company Post Office Box 18 Bowling Green Station New York, New York 10004
Dear Mr. Dolan:
DISTRIBUTION NRC PDR Local PDR ORB 1 File D. Eisenhut J.
Heltemes S.
Varga C. Parrish S. Miner OELD I8E (3)
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On August 14, 1981 you indicated that you found that the installation of certain safety-related switchgear bus cabinets and motor control centers were found to be inadequate to prevent these safety related equipment from overturning during the Design Basis Earthquake Event (DBE).
In your letters dated August 14, 1981 and August 27, 1981 you stated that you were installing temporary modifications to.s>ithstand the overturning movement due to the DBE and that the permanent modifications will be designed and installed by August 21, 1981.
By letter dated September 24, 1981 you indicated that all the modifications had been completed and you provided the details of these modifications.
l<e have reviewed the information provided and conclude that the modifications are acceptable.
Our safety evaluation is enclosed.
Sincerely,
'Oz'iginal Sioned By't,
Enclosure:
Safety Evaluation cc:
See next page Sydney Niner, Project Manager Operating Reactors Branch No.
1 Division of Licensing OFFICEI SURNAME/
ORB 1
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Mr. John Dolan, Indiana and Michigan Electric Company cc:
Mr. Robert W. Jurgensen Chief Nuclear Engineer American Electric-Power Service Corporation 2 Broadway New York, New York 10004 Gerald Charnoff, Esquire
,Shaw, Pittman, Potts and Trowbridge 1800 M Street, N.W.
Washington, D. C.
20036 Maude Preston Palenske Memorial Library 500 Market Street St. Joseph, Michigan 49085 Mr. D. Shaller, Plant Manager Donald C; Cook Nuclear Plant P. 0.
Box 458 Bridgman, Michigan 49106 U. S. Nuclear Regulatory Commission Resident Inspectors Office 770 Red Arrow Highway Stevensville, Michigan 49127 William J. Scanlon, Esquire 2034 Pauline Boulevard Ann Arbor, Michigan 48103 The Honorable Tom Corcoran United States House of Representatives Washington, D. C.
20515'
P P'
'. 4 SAFETY EVALUATION REPORT.
DONALD C.
COOK NUCLEAR PLANT UNIT NOS.
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DOCKET NOS. 50-316 5 50-317 Introduction P
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Several inadequate-cabinet and motor control center installations were discovered in Donald C.
Cook Units Nos; "1'.and 2.
lhe deficiencies d
t ctions taken were reported and updated in letters from the licensee dated August 14, August 17, August 28, p
Se tember 24, and November 16, 1981.
e
~0i ti As a result of the investigation conducted to satisfy the requi rements of Generic Letter 81-14 entitled "Seismic gualification of Auxiliary S t the installation of eight safety related switch gear/bus cabinets in both Donald C.
Cook Units Nos 1 and 2
and two f t 1 ted motor control centers in Unit No.
2 were found to be inadequate to resist the ovet turning moment duri g
g n
the Desi n Basis Earthquake (DBE) event.
Since overturning of these cabinets and motor control centers ma'y preven t
a revent.some safety related equipment from functioning, icensee dated.
the deficiencies were reported in letters from th
)icensee a
August 14, August 17 and August 28, 1981.
A t po a'ry modification was immediately proposed and agreed to by the NRC with the understanding that the reactor power will em r'he 60% level. It.was also agreed that further operational approval must be obtained from NRC'if the temporary modification is not 1
d th ight hours after reactor power reached the 60%
level.
The reactor could be returned to 100% power after p
y mo i ica ion is df
is completed on one train of equipment. 'owever, the.
temporary modification on the second train mus 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of the completion of that of the first train.
In a i ion, e desi ned and installed by about August Indiana a
d Ni hi an El Confirmation of this agreement was sent to n iana an Company in a letter from NRC dated August 18,.1981.
The temporary modification was made in the for p
form of ro e tiedowns which d d a proximate factor of safety of 2 on overturning momen s.
provi e
an ap
's of an le attachments and The permanent sqpporting system consists o
g weldments anchored in concrete.
The syst m p e
rovides factors o
sa e y against overturning moments from 4.0 to 1
p 14.3 as re orted in t e September 24 arid November 16 letters from the licensee.
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~'. 2i Conclusion Donald C. Cook Units Nos.
1 and 2-.have corrected'.,the deficiencies on a timely and acceptable.
basis with-acceptable factors of safety against overturning moments of 4.0 to 14.3.
Therefore;...the structural details of'he support system should be approved, with continued operation at the 1005 power 1 evel
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