ML20009G970

Forwards Safety Evaluation for SEP Topic III-10.A Re Thermal Overload Protection for Motors of Motor Operated Valves.Mods Proposed for Control Circuits for Motor Operated Valves in Safety Sys

ML20009G970
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	08/03/1981
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Hoffman D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
TASK-03-10.A, TASK-3-10.A, TASK-RR LSO5-81-08-001, LSO5-81-8-1, NUDOCS 8108050310
Download: ML20009G970 (5)

Text

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August 3, 1981 Docket No. 50-155 tn, LS05-81 08-001 a

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Mr. David P. Hoffman

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Huclear Licensing Administrator Consumers Power Company D **"

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<d Jackson, Michigan 49201

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SUBJECT:

SEP TOPIC III-10.A, THERMAL-0VERLOAD PROTECTION FOR MOTORS OF MOTOR-0PERATED VALVES, SAFETY EVALUATION REPORT FOR BIG ROCK POINT The enclosed revised staff safety evaluation is based on a contractor document that has been made available to you previously. This evalua-tion supports the findings of the staff safety evaluation of Topic III-10.A and proposes modifications to the control circuits for motor-operated valves in systems required for safety.

The need to actually implement these changes will be determined during the integrated safety assessment. This topic assessment may be revised in the future if your facility design is changtd or if NRC criteria relating to this topic are modified before the integrated assessment is completed.

l Sincerely, 1

l Dennis 11. Crutchfield, Chief Operating Reactors Branch No. 5 l

Division of Licensing

Enclosure:

j As stated cc w/ enclosure:

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NRC FORM 318 (t0-80) NRCM 024a OFFIClAL RECORD COPY usa m n w ee

Mr. David P. Hoffman CC

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Mr. Paul A. Perry, Secretary.

V. S. Environmental Protection Consumers Pcwer Corpany Agency 212 West Michigan Avenue Federal Activities Branch Jackson, Michigan 49201 Region V Office ATTN: EIS COORDINATOR Judd L. Bacon, Esquire 230 South

Dearborn Street,

Consumers Pcwer Company Chicago, Illinois 60604 212 West Michigan Avenue Jackscn, Micnigan 49201 Herbert Grcssman, Esq., Chairman Atcmic Safety and Licensing Board U. S. Nuclear Regulatory Commission Joseph Gallo, Esquire Isham, Lincoln & Beale Washington, D. C.

20555 1120 Connecticut Avenue Dr. Oscar H. Paris Room 325 Washington, D. C.

20036 Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Peter W. Steketee, Esquire Washington, D. C.

20555 505 Pecples Building Grand Rapids, Michigan 49503 Mr. Frederick J. Shan Atcmic Safety and Licensing Board Alan S. Rosenthal, Esq., Chairman U. S. Nuclear Regulatory Ccamission Atomic Safety & Licensing Appeal Board Washington, D. C.

20555 U. S. Nuclear Regulatory Commission Washington,'D. C.

20555 Big Rock Point Nuclear Pcwer Plant ATTN: Mr. C. J. Hartman Mr. J chn O' Neill, II

?lant Superintendent Route 2, Box 44 Charlevoix, Michigar J20

aple City, Michican 29664 Chri s:a-Mari a Charlevcix Public Library Rcu:e 2, Scx 108C Charlevoix, Micnigan 29720 107 Clin:ca Street Charlevoix, Micnican William J. Scanien, Escuirr.

2034 ?auline Eculevard Chairman County 5 card of Superviscrs Ann Arbor, Michigan 18103 Charlevcix Ccunty Charievcix, Michigan 49720 Resicent Inspector Big Rock Point Piar.t Office of the Governor (2) c/o U.S. NRC Room 1 - Capitol Building RR #3, Box 600 Lansing, Michigan 48913 Charlevoi;., Michigan 49720 Herbert Semmel Mr. Jim E. Mills Council for Christa Maria, et al.

Route 2, Box IC8C Charlevoix, Michigan 49720 Urban Law Institute Antioch School of Law 253316th Street, NW Thomas S. Moore Washingten, D. C.

20460 Atomic Safety & Licer. sing Appeal Board U. S. Nuclear Regulatcry Ccamission Washingten, D. C.

205 l

Mr. David P. Hoffman cc Dr. Jchn H. Buck Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatcry Conrnission L'ashington, D. C.

20555 Ms. JcAnn Bier 204 Clinton Street Charlevoix, Michigan 49720 l

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e SAFETY EVALUATION REPORT FOR EIG ROCK POINT PLANT

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TOFIC-III-iO.d THERMAL-DVERLOAD PROTECTION FOR MOTORS OF MOTOR-OPE 5ATED VALVES I.

INTRODUCTION The primary objective of thermal overload relays is to protect motor windings of motor-operated valves (MOV) ag: inst excessive heating.

This feature of thermal overload relays could, however, inttrfere with the successful functioning of a safety related systen.

In nuc-lear plant safety systent application, the ultimate criterion should be to drive the valve to its prouer position to mitigate the conse-

. quences of an accidents, rather han to be concerned with degradation of the motor due to excessive heating.

or fai II.

REVIEW CRITERIA The primary review criteria are:

1.

IEEE Std. 279-1971, and

.2.

Regulatory Guice 1.10c.

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I IV.

REVIEW G'JIDELI"ES The review should assure that:

(1) thermal overload prctection, if prcviced, for MOV's should have the trip setpoint at a value high ent ch to prevent spurious trips due to design inaccuracies, trip set-pci irif t, or variation in the acbient temperature at the installed icca n; (2) the circuits that bypass the thermal cverload protection urde accident conditions are designed to IEEE Std. 279-1971 crit -ia, as a;; c:riate for the rest of the safety related syster.; and (3) in "FJ designs that use a torque switch instead of a limit switch to li.it tne opening or closing cf the valve, the auto atic opening or cicsir; signal shcuid be used in conjunction with a ccrresponding li-it si.i^ch and therral overload should remain as tackup protecticn eser tre airst 10% cf valve travel.

V.

EVALUATION The design provisions for motor-operated valve protection are described in EGSG Report 1661F, " Thermal-0verload Protection for Motors of Motor-Operated Valves."

In summary, Big Rock Point does not meet carrent licenring criteria.

VI.

CONCLUSIONS The Big Rock Point designs do not satisfy the current licensing criteria for safety related valve functions.

Because of the failure of valves due to inadequate proteccion could lead to the failure of redundant systems, the staff proposes that the control systems for safety related valves be modified to satisfy our criteria.

.