ML17193A036
| ML17193A036 | |
| Person / Time | |
|---|---|
| Site: | Dresden  |
| Issue date: | 08/12/1980 |
| From: | Crutchfield D Office of Nuclear Reactor Regulation |
| To: | Peoples D COMMONWEALTH EDISON CO. |
| References | |
| TASK-03-10.A, TASK-3-10.A, TASK-RR NUDOCS 8009180060 | |
| Download: ML17193A036 (7) | |
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- D_ocket No. : 50-:237
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Mr. o. too.ts Peoples
_Director of Nuclear Licensing
. Commonwealth Edi son Cofill(lny
- Post Office Box 767
-' Chicago, Illinois. ~06~9 *. '.*
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. '.RE: ;.SEP.TOPI(1u.:.10.A, :THERMAL OVERLOAD PROTECTION FOR MOTORS OF MOTOR OPERATED ;VALVES'~ (ORES.DEN. UNH 2)
Enclosed 1~- a copy of. our.e*valuado~ of Sy.st*ematic_ Evaluation Program_*
Topic lll,;;10.A, "Thermal Overload *erote¢.ion.for Motors~ of Motor Operat~d Valves 11 This -assessment compares**your facility;* as described 1n Docket
. No. 50-237, with the criter1a*currently*used by the regulat*ory staff for*
1,icens1ng new fac111ties~ -Please inform us if your.as-bu11.t f~c111ty differs from the 11 cens ing-basis assumed in our assessment with-1 n 30 d~ys of re~ei pt of this letter.
This evaluation will be~*a *~as1c.input. to*th~*:.i.ntegrated safety assessment; for your facU1ty unless you 1dent1fy changes needed*to reflect the as-bu1lt
- cond1ttons at your facility.
Thts topic a*ssessment-~may*be.revised in th.e
.. future 1f your fac1-lity design 1.s cttanged<or 1f NRC cr1ter1a relating to this topic; are mod1fted before the integrated assessmen_t i.~ co111>leted.
Enclosure:
Corij>leted SEP
. *Topic II ~-*1 O.A.
cc w/enclosure:
See next *page M~,,~by 0 -: /_.*.
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Dennis M. Crutchfield, Chief
~rating Reactors Branch 05 _
.1., 1s1on of Ope~ating Reactors o.
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.NRC*FORM 318 (9*76) ['IRCM 0240
-tru:s'. GOVE-RNMENT 0P.RIN_TING OFFICE; 1979.-289-369
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UNITED STATES NUCLEAR REGULATORY COMMISSION WASHINGTON, D. C. 20555 Docket No. 50-237 Mr. D. Louis Peoples Director of Nuclear Licensing Corrmonwealth Edison Co~any Post Office Box.767 Chicago, Illinois 60690
Dear Mr. Peoples:
August 12, 1980 RE:
SEP TOPIC III-10.A, *THERMAL OVERLOAD PROTECTION FOR MOTORS OF MOTOR OPERATED VALVES* (DRESDEN UNIT 2)
Enclosed is a copy of our evaluation of Systematic Evaluation Program Topic III-10.A, "Thermal Overload Protection for Motors of Motor Operated Valves".
This assessment coq:iares your facility, as described in Docket No. 50-237, with the criteria currently used by the regulatory staff for
- licensing new facilities. Please inform us if your as-built facility differs from the licensing basis assumed in our assessment within 30 days of receipt of this letter.
This evaluation will be a basic input to the integrated safety assessment for your facility unless you identify changes needed to reflect the as-built conditions at your facility. This topic assessment may be revised in the future if your facility design is changed or if NRC criteria relating to this topic are modified before the integrated assessment is completed *
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Enclosure:
Con-p 1 eted SEP Topic I II-10. A cc w/enclosure:
See next page
. Sincerely, ~
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~~ Dennis.M. Crutchfield, Chief (j Operating Reactors Branch #5 Division of Operating Reactors
Mr. D. Louis Peoples cc w/enclosure:
Isham, Lincoln & Beale Counselors at Law August 12, 1980 Department of Public Health ATTN:
Chief, Division of One First National Plaza, Chicago, Illinois 60603 42nd Floor Nuclear Safety Mr. B. B. Stephenson Plant Superintendent Dresden Nuclear Power Station Rural Route #1 Morris, Illinois 60450 Natural Resources Defense Council 917 15th Street, N. w.
Washington, D. c.
20005 U. S. Nuclear Regulatory Conmission
- Resident Inspectors Office Dresden Station RR #1 Morris, Illinois 60450 Susan N. Sekuler Assistant Attorney General Environmental Control Division 188 w. Randolph Street Suite 2315 Chicago, Illinois 60601 Morris Public Library 604 Liberty Street Morris, Illinois 60451 Chairman Board of Supervisors of Grundy County Grundy County Courthouse Morris, Illinois 60450 535 West Jefferson Springfield, Illinois 62761 Director, Technical Assessment Division Office of Radiation Programs (AW-459)
- u. s. Envi.ronmental Protection Agency Crystal Mall #2 Arlington, Virginia 20460
- u. s. Environmental Protectio~
Agency Federal Activities Branch.
Region V Office ATTN:
EIS COORDINATOR 230 South Dearborn Street Chicago, Illinois 60604 Resident Inspector Dresden Nu cl ear Power Station c/o U. S. NRC Rural Route #1 Morris, Illinois 60450
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TOPIC III-10.A SEP TECHNICAL EVALUATION TOPIC III-10.A THElU'~,\\1,-0VERLOAD PROTECTION FOR MOTORS OF MOTOR-OPERATED VALVES DRESDEN 2 Theroal-Overload Protection for Motors of Motor-Operated Valves The obj'ective of this review is to provide assurance that the appli-cation of thermal-overload protection devices to motors associated with safety-related motor-ope=ated valves do not result in needless hindrance of the valves to perform their safety functions.
In accordance with this objective, the application of either one of the two recommendations contained in Regulc}tory Guide 1*106, "Thermal-Overload Protection for Electric Motors on Motor-Operated Valves, 11 is ade-quate.
These recommendations are as follows:
(1)
Provided that the completion of the safety function is not jeopardized or that.other safety systems are not degraded, (a) the thermal-overload protection devices should be continuously bypassed and temporarily placed in force only when the valve motors are undergoing periodic or maintenance testing, or (b) those thermal-overload protection devices that are normally in force during plant operation should be bypassed under acci-dent conditions.
(2)
The trip setpoint of th,e thermal-overload protection devices should be established with'all uncertainties resolved in favor of completing the safety-related action.
With respect to those uncertainties, consider-ation should be given to (a) variations in the ambient, temperature at the installed location of the overload 1
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protection devices and the valve motors, (b) inaccura-cies in motor heating data and the overload protection device trip characteristics and the matching of these two items, and (c) setpoint drift.
In order to ensure continued functional reliability and the accuracy of
- the trip point, the thermal-overload protection device should be periodically tested.
In addition, the current licensing criteria require that:
(3)
In MOV designs that use a torque switch to limit the opening or closing of the valve, the automatic opening or closing signal should be used in conjunction with a corresponding limit switch.
DISCUSSION Review of Dresden 2 drawings shows 109 motor-operated valves which are supplied power from ESF motor co~trol centers.4-9 All of these valves have thermal-overload protection devices which are not bypassed; there is no docketed information to indicate that TOL trip setpoints have been set to comply with Criterion'2, above. Additionally, where limit switches are used in conjunction with torque switches, the torque switch is the component which halts valve travel; the limit switch is used only to enable initiation of valve travel.IO-ZS EVALUATION Thermal-overload protection for motors of motor-operated valves at Dresden 2 does not comply with current licensing criteria. Thermal-overload devices are not bypassed, no evidence is available to support adequacy of trip setpoints, and torque switches, rather than limit switches, are used to terminate valve travel.
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REFERENCES
- l.
IEEE Standard 179-1971, "Criteria for Protection Systems for Nuclear Power Generating Stations."
- 2.
.Branch Technical Position EICSB-27, "Design Criteria for Thermal Over-load Protection for Motors of Motor-Operated Valves."
- 3.
Regulatory Guide 1.106, "Thermal Overlo.ad Protection for Electric Motors on Motor-Ope::-ated Valves."
- 4.
Dresden 2 drawing 12E2311, Revision P, dated 6-20-78.
- 5.
Dresden 2 drawing 12E2317, Revision K, dated 5-20-75.
- 6.
Dresden 2 drawing 12E2318, Revision P, dated 7-12-76.
- 7.
Dresden 2 drawing 12E2319, Revision N, dated 7-26-77.
- 8.
Dresden 2 d~~wing 12E2320, Revision R, dated 7-12-78.
I
- 9.
Dresden 2 drawing 12E2321, Revision E, dated 7-14-16.
- 10. Dresden 2 drawing 12E2398, Revision C, dated *12-5-77.
- 11. Dresden 2 drawing 12E2420A, Revision M, dated 12-9-76.
- 12.
Dresden 2 drawing 12E2420B, Revision K, dated 12-9-76.
- 13. Dresden 2 drawing 12E2432, Revision P, dated 1-22-75.
- 14.
Dresden 2 drawing 12E2433, Revision J, dated 12-1-76.
- 15.
Dresden 2 drawing 12E2440, Revision R, dated 12-9-76.
- 16.
Dresden 2 drawing 12E2441, Revisions, dated 12-14-77.
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. r.. 7.
Dresden 2 d~ing 12E2441A, Revision T, dat~l2-14-77 *
- a.
Dresden 2 drawing 12E2484, Revision F, dated 11-30-77.
- 19.
Dresden 2 drawing 12E2507, Revision M, dated 12-9-76.
ZO.
Dresden 2 drawing 12E2507A, Revision F, dated 12-9-76.
- 21.
Dresden 2 drawing 12E2508A, Revision E, dated 9-3-76.
- 22. Dresden 2 drawing 12E2508E, Revision F, dated 9-3-76.
- 23.
Dresden 2 drawing 12E2529, Revision W, dated 12-9-76.
- 24.
Dresden 2 drawing 12E2530, Revision M, dated 12-3-76.
- 25. Dresden 2 drawing 12~2594, Revision F, dated 12-4-78.
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