ML17257A515

Forwards Safety Evaluation of SEP Topic III-10.A Re thermal- Overload Protection for Motors of Motor Operated Valves. Facility Design Satisfies Current Licensing Criteria for All safety-related Valve Functions

ML17257A515
Person / Time
Site:	Ginna
Issue date:	08/03/1981
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Maier J ROCHESTER GAS & ELECTRIC CORP.
References
TASK-03-10.A, TASK-3-10.A, TASK-RR LSO5-81-08-003, LSO5-81-8-3, NUDOCS 8108050209
Download: ML17257A515 (6)

Text

August 3, 1981 Docket No. 50-244 LS05 08-003 Mr. John E. Maier, Vice President Electric and Steam Production Rochester Gas and Electric Corporation 89 East Avenue Rochester, New York 14649

SUBJECT:

SEP TOPIC III-lO.A, THERMAL-OVERLOAD PROTECTION FOR MOTORS OF MOTOR OPERATED VALVES, SAFETY EVALUATION REPORT (R.

E.

GINNA)

The enclosed staff safety evaluation is based on a contractor document that has been made available to you previously.

This evaluation is the staff's position regarding design of your facility in the subject area.

With regard to the referenced topic, the staff has concluded your facility meets current licensing criteria.

Sincerely,

Enclosure:

As stated cc w/enclosure:

See next page Dennis M. Crutchfield, Chief Operating Reactors Branch 85 Division of Licensing (8i08050209 810803

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Mr. John E. Maier CC Ha rry H. Yoigt, Esqui re

LeBoeuf, Lamb, Leiby and MacRae 1333 Hew Hampshire

Avenue, N.

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Suite 1100 Washington, D. C.

20036 Mr. Michael Slade 12 Trailwood Circle Rochester, Hew York 14618 Ezra Bialik

.'Assistant Attorney General Environmental Protection Bureau New York State Department of Law 2 World Trade Center Hew York, New York 10047 Jeffrey Cohen Hew York State Energy Office Swan Street Building Core 1, Second Floor Empire State Plaza

Albany, Hew York 12223

Director, Bureau of Nuclear Operations State of Hew York Energy Office Agency Building 2 Empire State Plaza

Albany, Hew York

~ 12223 Rochester Public Library 115 South Avenue Rochester, New York 14604 Supervisor of the Town

'of Ontario 107 Ridge Road West

Ontario, Hew York 14519 Resident Inspector R.

E. Ginna Plant c/o U. S.

NRC 1503 Lake Road

Ontario, New York 14519 Mr. Thomas B. Cochran Natural Resources Defense Council, Inc.

1725 I Street, H.

W.

Suite 600 Washington, D. C.

20006 U. S. Environmental Protection Agency Region II Office ATTN:

E I S COORD IHATOR 26 Federal Plaza Hew York, Hew York 10007

'erbert

Grossman, Esq.,

Chairman Atomic Safety ahd Licensing Board U. S. Nuclear Regulatory Comnission Washington, D. C.

20555 Dr. Richard F. Cole Atomic Safety and Licensing Board U. S. Nuclear Regulatory Cormission Washington, D. C.

20555 Dr.

Emmeth A. Luebke Atomic Safety and Licensing Board U.

S. Nuclear Regulatory Commission Washington, D. C.

20555

0 TOPIC:

III-10.A THERMAL-OVERLOAD PROTECTION FOR MOTORS OF NOTOR-..

OPERATED YALYES INTRODUCTION The primary objective of thermal overload relays is to protect motor windings of motor-operated valves (NOY) against excessive heating.

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

In nuc-lear plant safety system application, the ultimate criterion should be to drive the valve to its proper position to mitigate the conse-quences of an accidents, rather than to be concerned with degradation or failure of the motor due to excessive heating.

REVIEW CRITERIA The primary revi ew criteri a are:

l.

IEEE Std. 279-1971, and 2.

Regulatory Guide 1.106.

As a result of numerous operating.plant events resulting from torque switch problems the following supplemental criterion was used:

"(3)

In MOY designs that use a torque switch to limit the opening or closing of the valve, the automatic opening or closing signal

'hould be used in conjunction with a corresponding limit switch."

RELATED SAFETY TOPICS AWD IHTERFACES There are no safety areas related to the scope of this review that are addressed by other SEP Topics nor are any other topics dependent on the results of this review.

IY.

REVIEW GUIDELINES The review should assure that:

(1) thermal overload protection, if provided, for HOY's should have the trip setpoint.at a value high

'nough to prevent spurious trips due to design inaccuracies, trip set-point drift, or variation in the ambient temperature at the installed location; (2) the circuits that bypass the thermal overload:protection under accident conditions are designed to IEEE Std. 279-1971 criteri'a, as appropriate for the rest of the safety related system; and (3) in NOV designs that use a.torque switch instead of a limit switch to limit the openi,ng or closing of the valve, the automatic opening or closing signal should be used in conjunction with a corresponding limit switch and thermal overload should remain as backup protection over the first 10Ã of valve travel.

Y.

EVALUATION The design provisions for motor-operated valve protection are described in EG&G Report on this subject using the same'itle.

Furthermore, a

staff review of Licensee Event Reports did not indi cate that any valve failures have been caused by improper torque switch use.

Supplemental data provided by the licensee (and attached to this report),

shows that the torque switches are bypassed during valve acceleration but are not bypassed beyond full open or full closed.

Furthermore, there have been some torque switch problems but they have resulted in less than 9.4% of all motor operated valve failures.

VI.

CONCLUSIONS The Ginna designs satisfies the current licensing criteria for all safety related v'alve functions.

I

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