ML20030B103
| ML20030B103 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 07/27/1981 |
| From: | Jacobs R Office of Nuclear Reactor Regulation |
| To: | Hukill H METROPOLITAN EDISON CO. |
| Shared Package | |
| ML20030B104 | List: |
| References | |
| NUDOCS 8108050442 | |
| Download: ML20030B103 (26) | |
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--TERA DDiIanni-Gray Fi1e RJacobs H0rnstein Docket flo. 50-289 HSilver EBlackwood EHylton TMI Site Pouch BSnyder LcGwa Mr. Henry D. Ilukill, Vice President %gCty and Director - liiI-l lletmpolitan Edison Company I
P. O. Box 480 ftiddlecown, Pennsylvania 17057
Dear Mr. Hukill:
SUBJECT:
TRNIS!!ITTAL 0F ENVIRONMEilTAL QUALIFICATION INF0PMiTION Enclosed is information concerning recent testing on Limitorque motor operators with Reliance motors which should be used.to detemine whether i
the results of that testing are applicable to the motor operators in T'il-1.
This is the information referred to in the supplemental testimony of Dr. Z. Rosztoczy on UCS Contention 12. Evaluation of the Linitorque testing was recommended by the staff in this supplemental testimony to be A condition of restart.
, Sincerely,
- 0RTGntG SICEDM Richard 11. Jacobs, Project !!anager Operating Reactors Branch #4 Division of Licensing Enclostre:
As Stated cc w/ enclosure:
See next 3 pages 8108050442 810727 PDR ADOCK 05000289 P
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e Metropolitan Edison Company,
cc w/ enclosure (s):
Mr. Marvin I. Lewis Dr. Walter H. Jordan 6504 Bradford Terraca 881 W. Outer Drive Philadelphia, Pennsylvania 19149 Oak Ridge, Tennessee 37830 Walter W. Cohen, Consumer Advocate Dr. Linda W. Lit'tle Department of Justice 5000 Hermitage Drive Strawberry Square, 14th Floor Raleigh, North Carolina 27612 Harrisburg, Pennsylvania 17127 Ms. Gail P. Bradford Robert L. Knupp, Esq.
Anti-Nuclear Group Representing Assistant Solicitor York Knupp and Andrews 245 W. Philadelphia Street P. O. Box P York, Pennsylvani' 17404 407 N. Front Street Harrisburg, Pennsylvania 17108 John Levin, Esq.
Pennsylvania Public Utilities Comm.
John E. Minnich, Chairman Box 3265 Dauphin Co. Board of Commissioners Harrisburg, Pennsylvania 17120 Dauphin Counta "ourthouse Front and Market Streets Jordan D. Cunningham, Esq.
Harrisburg, Pennsylvania 17101 Fox, Farr and Cunningham 2320 North 2nd Street
- Atomic Safety and Licensing Appeal Board Harrisburg, Pennsylvania 17110 U.S. Nuclear Regulatory Commission Washington, D. C.
20555 Ms. Louise Bradford TMIA
- Atomic Safety and Licensing Board Panel 1011 Green Street U.S. Nuclear Regulatory Commission Harrisburg, Pennsyivania 17102 Washington, D. C.
20555 Ms. Marjorie M. Aamodt
- Docketing and Service Section R.D. #5 U.S. Nuclear Regulatory Conmission Coatesville, Pennsylvania 19320 Washington, D. C.
20555 Ms. Karen Sheldon Robert Q. Pollard Sheldon, Harmon & Weiss 609 Montpelier Street 1725 I Street, N.W. - Suite 506 Baltimore, Maryland 21218 Washington, D. C.
20006 Chauncey Kepford Earl B. Hoffman Judith H. Johnsrud Dauphin County Commissioner Environmental Coalition on Nuclear Power Dauphin County Courthouse 433 Orlando Avenue Front and Market Streets State College, Pennsylvania 16801 Harrisburg, Pennsylvania 17101 Ms. Frieda Berryhill, Chairman Ms. Ellen R. Weiss, Esq.
Coalition for Nuclear Power Plant Sheldon, Harmon & Weiss Postponement 1725 I Street, N.W.
2610 Grendon Drive Suite 506 Wilmington, Delaware 19808 Washington, D. C.
20006 Mrs. Rhoda D. Carr Mr. Steven C. Sholly 1402 Marene Drive linion of :encerned Scientists Harrisburg, Pennsylvania 17109 1725 I Street, N. W., Suite 601 Washington, DC 20006
1 Metropolitan Edison Company Mr. Thomas Gerusky Ms. Jane Lee Bureau of Radiation Protectinn R.D. 3, Box 3521 Department of Environmental Resources Etters, Pennsylvania 17319 P. O. Box 2063 Harrisburg, Pennsylvania 1.7120 Karin II. Carter, Esq.
505 Executive House
'P. O. Box 2357 Harrisburg, Pennsylvania 17120 ~
Honorable Mark Cohen 512 D-3 Main Capital Building Harrisburg, Pennsylvania 17120 G. F. Trowbridge, Esq.
Dauphin County Office Emergency Shaw, Pittman, Potts & Trowbridge Preparedness 1800 M Street, N.W.
Court House, Room 7 Washington, D. C.
20036 Front & Market Streets Harrisburg, Pennsylvania 17101 Mr. E. G. Wallace-Licensing Manager Department of Environmental Resources GPU Service Corporation ATTN:
Director, Office of Radiological Health 100 Interpace Parkway Parsippany, New Jersey 07054 P. O. Box 2063 Harrisburg, Pennsylvania 17105 Ms. Lennie Prough U. S. N. R. C. - T;1I Site P. O. Box 311 Middletown, Pennsylvania 17057 Ms. Virgiria Southard, Chairman 4
Citizees for a Safe Environment l
264 Walton Street Mr. Robert B. Borsum Lemoyne, Pennsylvania 17043 Babcock & Wilcox Government Publications Section Nuclear Power Generation Division State Library of Pennsylvania Suite 420, 7735 Old Georgetown Road Box 1601 (Education Building)
Bethesda, Maryland 20014 Harrisburg, Pennsylvania 17126
- Ivan W. Smith, Esq.
Mr. David D. Maxwell, Chairman Atomic Safety & Licensing Board Panel Board of Supervisors U.S. Nuclear Regulatory Commission Londonderry Township Washington, D. C.
20555 RFDil - Geyers Church Raod Middletown, Pennsylvania 17057 Ms. Kathy McCaughin Three Mile Island Alert, Inc.
U. S. Environmental Protection Agency 23 South 21st street Region III Office Harrisburg, Pennsylvania 17104 1
ATTN:
EIS COORDINATOR Curtis Building (Sixth Floor)
Mr. C. W. Smyth Supervisor of L' censing TMI-1 i
6th and Walnut Streets Philadelphia, Pennsylvania 19106 Metropolitan Edison Company P. O. Box 480 Middletown, Pennsylvania 17057 4
1 v-r v~--
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a Metropolitan Edison Company l Mr. R. J. Toole Allen R. Carter, Chairman Manager, TMI-l Joint Legislative Committee on Energy Metropolitan Edison Company P. O. Box 142 P. O. Box 480 Suite 513 Middletown, Pennsylvania 17057 Senate Gressette Building Columbia, South Carolina 29202 Daniel M. Pell, Esq.
ANGRY 32 South Beaver Street York, Pen'nsylvan'ia '17401 William S. Jordan, III, Esq.
Harmon & Weiss 1725 I Street, NW, Suite 506 Washington, DC 20006 J. B. Lieberman, L,q.
General Counsel Berlock, Israel & Liberman Federal Emergency Management Agency 26 Broadway ATTN: Docket Clerk New York, NY 10004 1725 I Street, NW Washington, DC 20472 i
York College of Pennsylvania Country Club Road York, Pennsylvania 17405 Mr. Donald R. Haverkamp p
Senior Resident Inspector (THI-1)
U.S.N.R.C.
P. O. Box 311 Middletown, Pennsylvania 17057 Mr. Richard Roberts The Patriot 812 Market Street Harrisburg, Pennsylvania 17105 Governor's Office of State Planning and Development ATTN: Coordinator, Pennsylvania State Clearinghouse P. O. Box 1323 Harrisburg, Pennsylvania 17120
[ 4/M[8 l MEETlf1G DBJECTIVES (g<ua b,.
i, taitt INFORM i1RC 0F DEVELOPMEllT TO DATE TO PER o
OF POTENTIAL IMPACT ON SAFETY FULFILL WESTINGHOUSE LEGAL OBLIGAT10tlS T0 o
TIME WESTINGHOUSE HAS KEPT STAFF ll0TIFIED OF D RECENT WEEKS BY fELECOM INITI AL LIMITOROUE FAILURE IDENTIFIED AS A "
ITEM" MARCH 5, 1981 FOR C0!!SIDERAT10N BY WEST!NGHOU SAFETY REVIEW COMMITTEE (SRC) liiVESTIGAT!0f1 '~"'. i!0T CONCLUDED TO FillAllZE RECOMMENDATlDi.
10 SRC Oil COMPLETION OF liiVESTIGATION A SAFETY C0llCLUS10NS AilD RECOMMEl!DATIONS W BE COMPLETED, REPORTED TO WESTINGHOUSE SRC AllD THE REPORT (10CFR PART 21)
EDUlPME!dOUALIFTCATI0f1 i
LIMITOROUE TESTitlG FOR WESTINGHOUSE o
MEETIf1G OBJECTIVES o
WESTillGHOUSE PROGRAM SPECIFICATI0li TEST UlilT DESCRIPTION TEST PROGRAM
-o PROBLEM DESCRIPTION FIRST FAILURE SECOND FAILURE o
PRELIMINARY FIllDIl1GS o
SAFETY ASSESSMEllT APPLICATIONS PREVIOUS TESTING ASSESSMENT l
0 ACTI0il PLAN l
l f
3 0
l TEST UNIT DESCRIPTION o OPERATOR:
MANUFACTURER:
LIMITOROUE TYPE-SIZE'.:
SMB-00 (INSIDE~ CONTAINMENT)
RATING:
14000 LBS. THRUST /250 FT.-LBS. TOROUE GEAR RATIO:
49:1 (30 SECCND STROKE. TIME)
GEAR LIMIT SWITCH - 4 TRAIN TOROUE SWITCH - STANDARD NUCLEAR o
MOTOR MANUFACTURE:
RELIANCE ELECTRIC RATING:
15 FT.-LBS.
460 VOLT /3 PHASE 1800 RPM RUN 3 FT.-LBS.
INSULATION:
CL' ASS RH SEALS:
VITON
y MOTOR SCHEMATIC STATOR ROTOR
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W IEE 323 L.974 TEST PROGRAM TESTlflG PERFORMED Ill ACCORDANCE WITH WCAP o
9688 PER INDUSTRY STANDARDS:
IEEE 323 1974 IEEE 382 1972 IEEE 344 1975 TYPICAL TEST SEQUENCE o
INSPECTION / BASELINE DATA THERMAL 8 WEAR AGING PRESSURE TEST RADIATI0fl AGING (NORMAL 8 ACCIDENT)
VIBRATION AND SEISMIC DBE Ef1VIR0f1 MENTAL 1
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o PROBLEM LESCRIPTION TWO LIMITOROUE MOTOR OPERATORS MALFUNCTIONED DURitlG THE DBE PHASE OF TWO SEPARATE QUALIFICATI0f1 TESTS e
o
WESTINGil00SE IEEE QUALIFICATION ACCIDENT PROFILE TEMP.
ACTUATION POINTS 13 MIN.
9 IIR.
21 IIR. 40 100 110 120 130 13.9 DAIS 1
I I
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If i
V 9
9 t
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CAUSTIC SPRAY 420*F 420 F (24 IIR. DURATION) 420*F -
340"F
. 340*F UNIT I MALFUNCTION V
- 4 UNIT 2 MALFUNCTION 305 E__
305*F 291*F L
q 277*F 262*F
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250*F t)
's 120 F._
p R00:1 T EMP. -
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3 5 MIN.
20 6
12 18 24 14 DAYS 10 SEC'2 Il00R OR MIN.
MAX.
MIN. IIR.
IIR. IIR.
IIR.
I STABILITYAT@
TIME 4%
N
~
SEQUENCE OF EVENTS UNIT 1 MALFUNCTION TEST EVENT GPERATOR REQUIRED TO CYCLE DURING DBE o
HIGH CURRENT SURGE INDICATION OPERATOR HALFUNCTIONS -
o DURIl1G CYCLE TEST TERMIhnTED 9 HOURS INTO LOCA a 291*F o
o MOTOR REMOVED FROM UNIT OPERATOR INSPECTION MANUALLY OPERATED - NO ANOMOLIES o
h0 TOR INSPECTION MOTOR SHAFT COULD NOT BE ROTATED MANUALLY o
MOTOR COMPLETELY DISASSEMBLED o
LOCKED ROTOR CONDITION EVIDENCED BY PHASE TO PHASE FAILUrf o
ALL PARTS RETURNED TO RELIANCE o
BEARINGS DEGREASED AND INSPECTED o
GREASE SOLUTION FILTERED o
SEQUENCE OF EVENTS UNIT 2 MALFUNCTION o
TEST EVENT o
OPERATOR REQUIRED TO CYCLE DURING DBE o
HIGH CURRENT SURGE INDICATION - OPERATOR MALFUNCTIONS - WILL NOT CYCLE o
TEST TERMINATED 21 HOURS INTO LOCA a 262*F o
MOTOR REMOVED FROM UNIT o
OPERATOR INSPECTION
- o. MANUALLY OPERATED - NO ANOMOLIES o
MOTOR lilSPECTION
'o MOTOR SHAFT DIFFICULT TO ROTATE MANUALLY o
MOTOR DISASSEMBLED El!D CAPS REMOVED i
- ' ROTOR REiiOVED'WITH BEARINGS INTACT ON SHAFT STATOR REMOVED IllTACT ALL PARTS RETURNED TO RELIANCE FOR DISASSEMBLY AiiD ANA o
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UNIT 1 PRELIMINARY OBSERVATIONS o
OPERATOR GEAR BOX AND SWITCH COMPAh! MENT NORMAL o
MOTOR
-LOCAL INSULATION FAILURE (PHASE TO PHASE)
-N0 DISCOLORATION OR VISUAL EVIDENCE OF INSU
-SHAFT WOULD NOT ROTATE
-BEARING OPERATION AFTER REMOVAL FROM SHAFT N RELATIVELY ROUGH
-DlSCOLORATION NOTED ON BALLS AND RACES
[20U$DIlBkIRk$GREASEEXIBITEDMAGNET
^
-GREASE DISCOLORED AS ANTIQPATED
-FOREIGN MATERIALS
-BEADS OF MELTED COPPER FOUND INSIDE MOTOR G
-m
UNIT 2 PRELIMINARY OBSERVATIONS o
OPERATOR GEAR BOX AND SWITCH C0i'iPARTMENT NORMAL o
MOTOR
-SHAFT DIFFICULT TO ROTATE MANUALLY
-BEADS OF MELTED COPPER FOUND INSIDE MOTOR CASE
-LOCAL INSULATION FAILURE (PHASE TO PHASE)
-ONE LEAD WIRE BURNED
-BEARING OPERATION SEEMED NORMAL AFTER ROTOR REMO l
SAFETY ASSESSMENT APPLICATIONS
/
l SMB - 00 OPERATORS USING RELIANCE CLASS f TYPE RH MOTORS
,i i
o GENERAL ACCIDENT MITIGATION WHERE OPERATION REQUIRED IN A HOSTILE ENVIRONMENT (I.E.
REQUIRED.
i 1
1 o
FUNCTIONS - PLANT SPECIFIC
- ACCIDENT MITIGATION - SHORT TERM
)
i CONTAINMENT ISOLATION, EXCESS LETDOWN ISOLATION (NEWER PLANTS) i j
- ACCIDENT MITIGATION - LONG TERM f
GENERALLY PROVIDED BY VALVES OUTSIDE CONTAINMENT I
- COLD SHUTDOWN - LONG TERM RHR SUCTION ACCUMULATOR ISOLATION i
i l
1
COMPARISON OF TOTAL QUALIFICATION SEQUENCES FOR VARIOUS LIMITOROUE QUALIFICATION PROGRAMS 1972 1974 1978 1981 TEST TEST TEST TEST
/3@
f 1.
THERMAL AGING 180*C 180*C
, NONE 286 *C 100 HRS.
100 HRS.
300 HRS.
.(WHOLE OPER, (ggDR (ggR 11.
MECHANICAL AGING 500 1208 NONE 2000+
(WHOLE OPERATOR)
. CYCLES CYCLES CYCLES OPbkOR) h4 bbRS 10 8
8 8
IV.
RADIATION TESTING 2.04X10 RAD.
2.04X10 RAD.
NONE 2.2X10 RAD.
(WHOLE OPERATOR)
GAMMA' ' '
GAMMA ~
GAMMA 9hNGLE/7 MIN NONE V.
VIBRATION / SEISMIC 10 S C /3G S,.0 SEC /5GAXIS S
(WHOLE OPERATOR)
SINGLEAXIS NGL:
VI.
DBE ENVIRONMENT
-TWO SPIKES
-TWO SPIKES
-TWO SPIKES
-TWO SPIKE!
(WHOLE OPERATOR)
-340*F FOR
-300*F FOR
-385*F FOR
20 MIN EA.
3 MIN. EA.
3 MIN. EA
~hbhFhbR
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0 F hbk ~hfhh hbk ~hbhh hb 29 DAYS 29 DAYS 3 HOURS 14 DAYS 68 PSIG A*
-105 PSIG AT
-70 PSIG AT
-66 PSIG FOR MAX. TEMP MAX. TEMP.
MAX. TEMP.
WHOLE TEST
~
l i
ACTION PLAN o
MOTOR ANALYSIS UNIT 1 o
MOTOR ANALYSIS UNIT 2
- o HELB TEST WITH UNAGED MOTOR / BEARING & STATOR o
PROBLEM RESOLUTION o
PERFORM IEEE QUALIFICATION ENTIRELY l
l l
g MOTOR ANALYSIS UNIT #1 o
ANALYZE EXPOSED GREASE & SOLID RESIDUE o
EXAMINE WORN BEARING PHYSICAL CONDITION DIMENSIONS PHYSICAL PROPERTIES CHEMICAL PROPERTIES o
EXAI' TINE NEW BEARING DESIGN TYPE MATERIAL DIMENSIONS TOLERANCE B-10 LIFE LUBRICATION MANUFACTURE o
MOTOR STATOR VISUAL ELECTRICAL - TO BE DETERMINED OF REMAINING W COMPLETION DATE APRIL' 21; 1981 40 i
SAFETY ASSESSMEf4I o
PREVIOUSLY UNDETECTED COMMON - MODE FAILURE MECHANISM UNLIKELY DUE TO:
EXTENSIVE PREVIOUS TESTING IN - PLANT EXPERIENCE BASED ON WDE-SPREAD APPLICATION OF LIMITOROUE OPERATORS o
FAILURES MORE LIKELY TO HAVE BEEN IND!.'CED BY EITHER:
CHANGES IN THE PRODUCT THAT HAVE NOT BEEN PREVIOUSLY TESTED DE CONSERVATISMS IN THE 1 QUALIFICATION TEST 1
PROCEDURE NOTPREVIOUSLY EMPLOYED l
l l
l l
i
SIGNIFICAf1T DIFFEREf4CES FROM PREVIOUS TESTS o
40 YEAR AGINb SIMULATIC PREVIOUS TESTS INCLUDED THERMAL AGillG OF~ STATOR ONLY.
WESllNGH0dSE THERMALLY AGED WHOLE OPERATOR.
MECHAf11 CAL AGING CYCLES DOUBLED.
MECHANICAL AllD THERMAL AGltlG COMPLETED CONCURRENTLY.
PRESSURE TEST (72 PSIG/24 HRS) COMPLETED FOR FIR o
SEISMIC LEVELS INCREASED (7G VERSLS Sc) o PH OF CHEMICAL SPRAY IflCREASED (10.57VERSUS 7.5) o DBL FEAK TEMPERATURE HIGHER (420'F VERSUS 385 F o
h
=- -
TESTS OF LIMITti E 0 E]N~0(S WITil CLASS 11 R
ANC NO~ ~6 (S 11 TEST IN APRIL, 1981 i
500 MAXIMUM N L/O
...... MOTOR TEMP.
U" FOR ALL LIMITOROUE TEST l
IN AUGUST, 1972 TESTS e'
f 420/68 psig 420/68 psig t
400 -
385/66 psig LIMITOROUE TEST
+ + + + t- -5 +
}385/66psig g
IN OCTOBER, 19'8
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I 317/66 psig i.....
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292/S8 psig s
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2 3
4 5
6
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8 9
10 11 12 13 Il0VRS INTO TEST
PRELIMI M RY ASSESSI M OF CAUSES o
PROBLEM UNLIKELY TO HAVE BEEN INDUCED BY DESIGN OR MATERIAL CHANGES DUE TO LIMITOROUE AND RELIANCE QUALITY-C0fiTROLS, FOREIGil MATERIALS STILL UNDER INVESTIGATION.
AND VERIFICATION AGAINST SPECIFICATIONS.
o H PROCEDURES FOR ACCELARATING 40 YEARS AGING MAY BE CAUSE OF FAILURE:
ACCELARAIED THERMAL AGING OF BEARING LUBRICANTS EMPLOYlf1G ARRHENIUS MAY BE INAPPROPRIATE CONCURREliT MECHANICAL AllD THERMAL AGil1G MAY LEAD TO SYNERGISTIC EFFECTS
o MOTOR ANALYSIS UNIT #2 o
ANALYZE EXPOSED GREASE & SOLID RESIDUE o
EXAMINE WORN BEARING PHYSICAL CONDITION DIMENSIONS PHYSICAL PROPERTIES CHEMICAL PROPERTIES o
EXAMINE NEW BEARING DESIGN TYPE MATERIALS DIMENSIONS TOLERANCE B-10 LIFE LUBRICATION MANUFACTURE o
MOTOR STATOR DI' ELECTRIC OF WIRE INSULATION DIELECTRIC OF SLOT MATERI AL DIELECTRIC 0F PHASE MATERIAL CONPLETION DATE MAY 1,1981
IMPACT ON SAFETY o
EVEN WITHOUT PREVIOUS TESTI!1G, POTENTIAL IMPACT ON SAFETY IS SMALL SINCE, Ill GENERAL:
n,s Of1LY SHORT-TERM MITIGATIllG FUtlCTIONS ARE COMPLETED BY OPERATORS INSIDE CONTAINMENT.
THESE HAVE BEEN' ADEQUATELY DEMONSTRATED BY WESTINGHOUSE TEST PROGRAM.
LONG-TERM FUNCTI.0NS REQUIRED TO ATTAIN SAFE (HOT)
SHUTDOWN ARE COMPLETED FROM $UTSIDE CONTAINMENT.
o OUALIFICATI0fl 0F LIMITOROUE OPERATORS TO LEVELS ENCOMPASSING OPERATING PLAllTS IS ESTABLISHED BY EXTENSIVE PREVIOUS TESTS o
UNTIL CAUSE OF FAILURES IS CLEARLY ESTABLISHED THERE IS NO REASON TO BELIVE THIS QUALIFICATION IS VIOLATED
QGh D h 0>
- >o 92 %
Westinghouse Water Reactor N e ie3=mtromsca Electric Corporation Divisions mm Msteg9ennsyhafa E233 NS-TMA-2444 May 4,1981 W. R. Rutherford Office of Inspection and Enforcement Nuclear Regulatory Commission Washington, D.C.
20555
Dear Mr. Rutherford:
NRC Independent Verification Procram This letter fulfills the commitment made by George Butterworth of my staff to provide you with a written summary of recent developments on the two Westinghouse qualification, test programs selected by the Staff for review and inspection es part of the NRC Independent Verificction Program The following information briefly summarizes the details passed by telecon to Al Bennett and your elf last week.
Limitarcue Motor Operator Test Procram The action plan to identify the cause of the two recent test failures, that was outlined to you at our meeting of April 14th, is on schedule. Two reports have been received from Limitorque contair.ing the Unit I and Unit 2 failure onclysis. Both reports conclude that the failure was mechanical in ncture, involving the motor-becrings, cnd resulted in an electrical phase to phase failure. The reports are being reviewed in detail by Westinghouse and additional analysis of the motor will be required.
As propc:ed at our meeting of April 14, a new motor operator has been subjected to the Westinghouse high energy line break test simulation without any prior aging or seismic testing. The operator performed without proble.m through the initial temperature transient and some ten (10) days into the fourteen (14) day post accident one year aging simulation at 2500F. At this time the motor began to exhibit excessive starting current and power requirements as well as significant phase to phase current imbalance. The test was immediately terminated and the unit removed for inspection. Preliminary findings on this unit confirm some deterioration of the bearings and of the motor insulation at the some point as noted previously. Clearly a pattern has now been established and we are hopeful of a i
solution in the near future. These recent findings will be the subject of a meeting this week between Re!ionce, Limitorque and Westinghouse to decide the next stage of the investigation.
I Dh7Ic5zyolSo a
c d
_.,. -, _ _.. _ _ _., - - -, - _, _ ~. -
T'his last test of a new unit would seem to indicate that the Westinghouse aging procedure, while apparently exacerbating the problem, is not the originating cause l
of these failures. Thus, given the previous successful extensive testing completed 1.
by Limitorque, we are proceeding on the basis that the failures are due to an und-tected change in the product or due to either the more restrictive test l
conditions employed by Westinghouse or some difference in test procedure.
Barton Lot 4 Transmitter Test Program During the recent visit of your inspection team headed by Al Bennett to witness high energy line break testing of the Barton Lot 4 units, one differential pressure 1
unit stcrted to give on oscillctory output during relatively steady test conditions.
l This was later followed by a period of drift and some recovery. Before testing of l
the six (6) Lot 4 units was completed, a further differential pressure unit had exhibited similcr behavior and a pressure unit had shown some anomalous output signais. The tests were allowed to go to completion and on April 27 the units were removed from the test chamber for static calibration. The three units that showed cnomalous behavior are currently in the process of being shipped back to Barton for i
i
- nspection. In the immedicte future the test output traces from the:e units will be analyzed to support the investigation.
These Lot 4 units are virtually identical to the successfully tested Lot 2 units. As a consequence, it is unlikely that any previous undetected significant failure mechanism is invc:ved and more likely the cause is either random in nature or due to the more restrictive test procedures and percmeters being employed by t
Westinghcuse for this recent series of tests.
We will keep you informed of any significant developments resulting from our l
investigotior.s.
If you have any questions concerning this information, please l
contact George Butterworth (412-3'i3-576I) or Alex Ball (412-373-5628) of my staff.
Sincerely yourc pf, c
T. M. Anderson, Monager Nuclear Safety Department GB/ keg I
. _ _ =
=.
,\\
UNITED STATES
[(",^53 "i NUCLEAR REGULATORY COMMISSION 9h IW J() g k(
W ASHING T ON. D. C. 20555 g
il
\\; '
f' MAY 8 1531 i
i MEMORANDUM FOR:
G. W. Reinmuth, Chief, Vendor and Special Projects Branch, Division of Resident and Regional Reactor Inspection, IE FROM:
A. B. Bennett, Vendor and Special Projects Branch, Divis, ion of Resident and Regional Reactor Inspection, IE
SUBJECT:
STATUS REPORT - QUALIFICATION OF LIMITORQUE VALVE ACTUATORS AND BARTON LOT 4 TRANSMITTERS 4
Ref:
Telecon, G. Butterworth (Westinghouse), A. B. Bennett and W. R. Rutherford (NRC), May 1,1981 1.
Limitoroue The Limitorque valve actuators are being qualified by Westinghouse in accordance with IEEE 323-1974. The manufacturer is performing the LOCA/
MSLB environmental testing in their laboratory. We have reviewed the test plan and associated documents (at Westinghouse on December 15-19, 1980) and inspected the test facility on January 22-23, 1981.
During a meeting held in Bethesda with personnel from IE, NRR, Westinghouse, Limitorque and Reliance Electric attending, Westinghouse formally informed the NRC of two failures during qualification attempts of the valve actuator assemblies; one on February 28, 1981, the second on April 7, 1981. The failures nre observed 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> and 21 hours2.430556e-4 days <br />0.00583 hours <br />3.472222e-5 weeks <br />7.9905e-6 months <br /> resoectively after initiation of the stean spray profile.
Also during the meeting Westinghouse advised that a program would be developed to evaluate the failures, including exposing a new assembly to the steam / environment without previously exposing it to chemical spray, thermal or radiation aging, or any other aging required.
On May 1,1981, Westinghouse, per above reference, reported the failure of the new valve actuator 10 days after initiation of the steam / chemical spray environmental test.
The first two failures have been attribute [to bearing problems in the Reliance motors used to drive the valve actuators.
The third failure was similar to the first two in that the load current increased beyond normal.
The test was terminated on the third failure prior to complete loss of response, or total destruction of the motor windings.
Westinghouse is evaluating the failure reports (performec by Reliance).
No future program for pursuing the failurss was given pending a complete evaluation by Westinghouse.
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G. W. Reinmuth MAY S 1331 2.
Barton Transmitters, Lot 4 The Barton transmitters are being qualified by Westinghouse, NES in accordance with IEEE 323-1974.
Westinghouse, Forest Hills is performing the LOCA/MSLB environmental testing.
We reviewed the test plan and associated documents (at Westinghouse on December 15-19, 1980) and inspected the test facility March 27, 1981. We ooserved the initiation of the LOCA/
MSLB environmental test on April 6,1981.
At that time, the output from one of the D/P transmitters, Serial #853 began to exhibit abnormal output current during the second tenperature ramp.
During our May 1 telecon, Westinghouse reported abnormal readings of Serial #853 and two other transmitters during the environmental test.
The other two units were identified only as a D/P transmitter and a Pressure transmitter. Westinghouse reported that Barton is invest! gating the problems and that a formal report would be issued the week of May 4,1981.
3.
.We requested that Westinghouse submit a weekly status report and advise us of any findings pertinent to the failures of both Limitorcue and Barton ur.its when the information beccmes available.
4.
A draft Information Notice is being circulated for comment to report the Reliance motor (Limitorque) problems. The Barton deficiencies will be added to the Information Notice.
7 f'B.Bennetths-ac.@ W A7 Vendor and Special Projects Branch Division of Resident and Regional Reactor Inspection, IE
Enclosure:
Westinghouse letter, N5-TKA-2444, dtd. May 4,1981 cc/w enclosure:
J. H. Sniezek, IE W. R. Rutherford, IE 4
l R. H. Vollmer, NRR i
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