ML20041C248

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Forwards IE Info Notice 82-01, Auxiliary Feedwater Pump Lockout Resulting from Westinghouse W-2 Switch Circuit Mod. No Written Response Required
ML20041C248
Person / Time
Site: Callaway 
Issue date: 02/08/1982
From: Youngblood B
Office of Nuclear Reactor Regulation
To: Schell D
UNION ELECTRIC CO.
References
NUDOCS 8202260400
Download: ML20041C248 (3)
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LB#1 Reading TERA DEisenhut NRC/PDR FEB 8 1982 GEdison L/PDR BJYoungblood NSIC MRushbrook TIC Docket No.: STN 50-483 RVollmer ACRS (16)

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co Mr. D. F. Schnell SHanauer Vice President - Nuclear RHartfield, MPA E

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,1 Union Electric Company 0 ELD Post Office Box 149 OIE FEgy O 1992 s h St. Louis, Missouri 63166

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Dear Mr. Schnell:

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Subject:

IE Infonnation Notice No. 82-01 D/

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The enclosed infonnation notice is provided for your information.

If you have questions regarding this matter, please contact the Regional Administrator of Region III.

Sincerely.

Original nignod by:

B. J. Youngblood B. J. Youngblood, Chief Licensing Branch No. 1 Division of Licensing

Enclosure:

As stated cc w/ encl.: See next page also J.Neisler(RegionIII)

J. G. Keppler (Region III) 8202260400 820208 PDR ADOCK 05000483 G

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NRC FORM 3i8 00-80) NRCM Ono OFFICIAL RECORD COPY usaro. isei-swea L

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Mr. D. F. Schnell Vice President - Nuclear Union Electric Company Post Office Box 149 St. Louis, Missouri 63166 cc:

Mr.'tiicholasA.Petrick Mr. Fre'd Luekey Executive Director - SNUPPS Presiding Judge, Montgomery 5 Choke Cherry Road County Rockville, Maryland 20850 Rural Route Rhineland, Missouri 65069 Gerald Cha~rnoff, Esq.

Thomas A. Baxter, Esq..

Mayor Howard Steffen Shaw, Pittman, Potts &

Chamois, Missouri 65024 Trowbridge 1800 M Street, N. W.

Professor William H. Miller

.i Washington, D. C.

20036 Missouri Kansas Section, Mr. J. E. Birk American Nuclear Society Assistant to the General Counsel Department of Nuclear Union Electric Company Engineering Post Office Box 149 1026 Engineering Building St. Louls, Missouri 63166 University of Missouri Columbia, Missouri 65211 Mr. John N6isler U. S. Regulatory Commission Robert.G. Hright Resident Inspector Office Ass.ocT Judgel EasterhiDistrict....-

RR#1 Steedman, Mis'souri 65077 County Court...CillniaTCounty,' M0cf

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Mr. Donald W. Capone, Manager Fulton, Missouri 65251 Nuclear Engineering Kenneth M. Chackes Union.Eiectric Company

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Intefvenors A. Scott Cauger, Esq.

314 N. Broadway Assistant General Counsel St. Louis, Misscuri 63102 for :ne ".isscuri Friic Service Commission Mr. Earl Brown Post Office Box 360 School District ~ Superintendent Jefferson City, Missouri 65101 Post Office. Box 9 Kingdom City, !!issouri 65262

.Ms. Barbara Shull fir. Samuel J. Birk f-is. Lenore.Loeb

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R. R. #1, Box 243 League of Women Voters of liissouri 2138 Woodson Road Morrison, Missouri 65061 St. Louis, Missouri 63114 Mr. Harold Lottman Ms. Marjorie Reilly Presiding Judge, Dasconade County Route 1 Energy Chairman of the Owensville, Missouri 65066 League of Women Voters of University City, MO Eric A. Eisen, Esq.

7065 Pershing Avenue University City, Missouri 63130 Birch, Horton, Bittner and Monroe Suite 1100 1140 Connecticut Avenue, N. W.

Washington, D. C.

20036 L.,

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.l Mr. D.'F. Schnell.

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Mr. John G. Reed Route #1 Kingdom City, Missouri 65262 Mr. Dan I. Bolef, President Kay Drey,. Representative Board of Directors Coalition

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for the Environment St. Louis Region 6267 Delmar Boulevard University City, Missouri 631,30 Mr. Donald Bollinger, Member Missourians for Safe Energy 6267 Delmar Boulevard University City, Missouri 63130 Ms. Rose Levering, Member Crawdad Alliance 7370a Dale Avenue St. Louis, Missouri 63117 Mr. James G. Keppler Nuclear Regulatory Commission,. Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137

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611 RYAN PLAZA DRIVE, SUITE 1000 ARUNGToN, TEXAS 75011 January 25, 1982 Gentlemen:

The enclosed IE Information Notice provides early notification of an event that may have safety significance.

It is expected that recipients will review the IE Information Notice for possible apol'cability to their facilities.

If you have any questions regarding this matter, please contact this office.

Sincerely,

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Enclosures:

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IE Infor ation Notice No. 82-01 2.

.is: cf F.ecen:iy Issued :nf maticn M:: ices i

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i' l ~ -- n IE INFORMATION NOTICE B2-01:

t AUXILIARY FEEDW4TER PUMP. LOCKOUT RESULTING FROM WESTINGHOUSE W-2 SWITCH CIRCUIT MODIFICATIONS Licensee Facility / Docket Number Arkansas Power and 1ight Conpany Arkansas Nuclear One, Unit 1 & 2 Little Rock, Arkansas 50-313; 50'368 Nebraska Public Power District Cooper Nuclear Station Columbus, Nebraska

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50-298 Omaha Public Power District Fort Calhoun Station Omaha, Nebraska 50-285 Public Service Company of Colorado Fort St. Vrain Generating Station Denver, Colorado 50-267 i

Gulf States Utilities River Bend Beaumont Texas 50-458; 50-459 ct A

e Houston Lighting & Power Campany South Texas Proje Houston, Texas 50-498; 50-499 RECElyED 3

M 29 IS82 Kansas Gas & Electric Company Wolf Creek

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Wichita, Kansas STN 50-482 Louisiana Power & Light Company Wate'rford-3

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New Orleans, Louisiana 50-382 is g og 4-gcvn' Texas. Utilities. Generating

  • Comp *any'**W. Comanche Peak Steam Electric Station

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SSINS No.:

6835 Accession No.:

8107230043 IN 82-01' UNITED STATES NUCLEAR REGULATORY COMMISSION 0FFICE OF INSPECTION AND. ENFORCEMENT WASHINGTON, D.C.

20555 January 22, 1982 IE INFORMATION NOTICE NO. 82-01:

AUXILIARY FEEDWATER PUMP LOCK 0UT RESULTING FROM WESTINGHOUSE W-2 SWITCH CIRCUIT MODIFICATION Description of Circumstances:

-On September 14, 1981, Commonwealth Edison's. Zion Unit 2 was conducting a normal.

plant coold.o.wn to begin a refueling outage.

The reactor coolant system was

. operating at 350 psig and 250 F.

Both residual heat removal (RHR) systems were operating to remove decay heat and control reactor. coolant system temperature.

Steam generator water levels dropped below the 10% low level auxiliary feedwater (AFW) pump auto-start setpoint, and the motor-driven AFW pumps activated as

- designed.

The operator placed the control switches in the pull-to-lock-out position to stop the AFW pumps.

Later, to control the rate of plant cooldown, the operator tried to increase the cooldown rate by feeding water to the steam generators.

The AFW pumps would not restart on command.

The power supply circuit breaker.for one of the pumps was momentarily racked out to 'the disconnect position and then racked back in for service.

As a' result of this

n. seer.P{9pe,du.e,ith $[W. pump...restar,tyd..g.Jo.,fgrtgr;,p, rot 3 pgsgergg,ncpgn,tegedju_r,i ypg.

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f t e'pli coo own operation.

Investigation into the problem revealed that the licensee's modification to the Westinchouse W-2 control switch used with the AFW pumos differed from that rec-- enced in IE Euile.in 50-20 (IEE).

IEE 80-20, entitled " Failures cf Westinghouse Type W-2. Spring Return to Neutral Control Switches," reccmmended using only the exi' sting green status light to provide early detection of an open circuit caused by a neutral position (auto-start) contact failure of the control switch.

However, in this application, the licensee's modification included both the r'ed and green status lights.

This resulted in a sneak circ'uit path which prevented AFW pump restart under certain circumstances.

Following an auto-start of the AFW pump and the subsequent securing of that pump by placing the control switch in the pull-to-lock-out position, the licensee found that a live continuous circuit existed between the red light and the anti pump coil.

This sneak current path prevented deenergization of the anti pump coil (circuit reset) that is necessary for pump restart.

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IN 82-01 January' 22,' 1982 Page 2 of 2 The licensee reports-that, following the initial circuit modification, the sneak path was noted to cause the red indicating light to glow only dimly when the control switch was placed in the pull-to-lock-out or trip positions (see Figures 1 through 3 and Table 1).

However, the stieak path was not fully analyzed at that time, and no detailed function testing of the modified circuit was performed.

Note that when the red light is used to indicate " pump on," as in this application, the light should not go on when the control switch has been placed in either the pull-to-lock-out or trip positions.

Circuit modifications may have been made at various plants in response to information in IEB 80-20..These modifications, where different from IEB 80-20 recommendations, may have caused sneak paths with various degrees of impact that may not have been detected by previous engineering analysis or post-installation testing.

This information notice is provided as an early notification of a potentially significant matter.

It is expected that recipients will review the information for applicability to their facilities.

No specific action or response is required at this time.

If you have any questions regarding this matter, please

' contact the Regional Administrator of the appropriate NRC Regional Office.

Attachment:

Figures 1, 2 and 3

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IE Informatica Notice No. 82-01 January 25, 1982 LISTING OF RECENTLY ISSUED IE INFORMATION NOTICES Information Subject.~

Date Issued To

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Notice No.

Issued 81-32.

Transfer and/or Disposal of 10/23/81 All medical licensees Spent Generators 81-33 Locking Devices Inadequately 11/9/81 All power: reactor facilities Installed on Main Steam with an Operating License Isolation Valves (OL) or Construction Permit (CP) 81-34 Accidental Actuation of Prompt 11/16/81 All power reactor facilities Public Notification System with an Operating License (OL) or Construction Permit (CP) 81-35 Check Valve Failures.

12/2/81 All power reactor facilities with an Operating License (OL) or Construction. Permit (CP)

S1'-36 Replacement Diaphragms for 12/3/81 All power reactor facilities sc =y+; eNws%.+-o Robertshaw. Valve (Mode 19tWh.wdM-withean' 04 rating L4censek ve No. VC-210)

(OL) or Construction Permit (CP)-

81-37 Unnecessary Radiation 12/15/81 All byproduct material Exposure to Public &

licensees Workers during Events Involving Thickness &

Level Measuring Devices 81-38 Potentially Significant 12/17/81 All power reactor facilities Equipment Failures with an Operating License Resulting from Contam-(OL) or Construction Permit ination of (CP)

Air-Operated Systems 81-39 EPA Crosscheck Program 12/23/81 - All power. reactor facilities

. Low Level Radioiodine in with an Operating License Water Test Program (OL) or Construction Permit (CP), and Priority I matarial licensees Enclosure e

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