ML17326B366

Part 21 Rept Re Environ Qualification of Torque Switches Designed by Limitorque Corp.Initially Reported on 880330. Design Not Qualification Tested for Nuclear safety-related Svc.Untested Torque Switches Will Be Replaced

ML17326B366
Person / Time
Site:	Cook
Issue date:	04/04/1988
From:	Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	Murley T NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
REF-PT21-88, REF-PT21-88-029-000 AEP:NRC:0971E, AEP:NRC:971E, PT21-88-029-000, PT21-88-29, NUDOCS 8804110193
Download: ML17326B366 (7)

Text

ACCESSION NBR FACIL: 50-3i 5 50-3fh AUTH. NAME ALEX ICHOR M. P.

RECIP. NAME MURLEYz T. E.

REGULA Y INFORMATION DISTRIHUTI YBTEM (RIDS) 8804f fOf93 DOC. DATE 88/04/04 NOTARIZED:

NO DOCKET 0 Donald C.

Cook Nuclear Power Planti Unit 1>

Indiana 8c 05000315 Donald C.

Cook Nuclear Poeer Plant'nit 2i Indiana Rc 050003fh AUTHOR AFFILIATION Indiana Michigan Pacer Co.

(formerly Indiana 5 Michigan Ele RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Part 2i rept re environ qualification o0 torque seitches.

L~

DISTRIBUTION CODE:

IEf9D COPIES RECEIVED: LTR ENCL SIZE TITLE: Part 21 Rept (50 DKT)

NOTES:

RECIPIENT ID CODE/NAME PD3-3 LA BTANGi J INTERNAL: AEOD/DOA ARM TECH ADV NRR VARQAiS NRR/DEBT/ADS 7E NRR/DOEA/EAB if.

NRR /DR IB/VIO'PD4 Of IB RQN2 RGN4 EXTERNAL:

INPO RECORD CTR NRC PDR COP IEB LTTR ENCL i

0 i

i ii 1

iii i

i i

i i

i i

ii i

i i

RECIPIENT ID CODE/NAME PD3-3 PD

• EOD/DSP/TPAH NRR CRUTCHFIELD NRR/DEST/ADE SH NRR/DLPG/GAB i0 NRR/DOEA/QCH fi NRR/PM*S/ILRHf2 RES DEPY QI RGNi RGN3 RQN5 LPDR NSIC SILVER. E COP IEB LTTR ENCL i

TOTAL NUMBER OF COPIES REQUIRED:

LTTR 27 ENCL 26

Indiana Michigan Power Company P.O. Box 16631 Columbus, OH 43216 8

880413.Oi93 880404 PDR ADOCK 050003i5 8

AEP:NRC:0971E Donald C.

Cook Nuclear Plant Units Nos.

1 and 2

Docket Nos.

50-315 and 50-316 License Nos.

DPR-58 and DPR-74 ENVIRONMENTAL QUALIFICATION OF TORQUE SWITCHES U.S. Nuclear Regulatory Commission Attn:

Document Control Desk Washington, D.C.

20555 Attn:

T. E. Murley April 4, 1988

Dear Dr. Murley:

This letter provides a written report confirming the telephone conversation of March 30,

1988, between Indiana Michigan Power and the NRC Operations

Center, regarding notification made pursuant to Title 10 CFR Part 21.

On March 30, 1988, American Electric Power Service Corporation received notification from Limitorque Corporation that the torque switch design employed on some valve operators in use at Cook Nuclear Plant have not been qualification tested for nuclear safety related service.

These valve operators are Limitorque Model SMB-00 that incorporate a design used during the first few years this model was produced.

Based on our evaluations, which considered the lack of torque switch qualification tests, we believe that safe plant operation will continue to be maintained.

Additional -details are included in the attachment.

For further details on clarification, Mr. Paul A. Barrett,

Manager, Nuclear Safety and Licensing, can be reached at 614/223-2040.

0

~

~

~J

'I

Dr. Murley AEP:NRC:

0971E This document has been prepared following Corporate procedures which incorporate a reasonable set of controls to ensure its accuracy and c'ompleteness prior to signature by the undersigned.

Sincerely, M. P. Al ich Vice President eh Attachment cc:

D. H. Williams, Jr.

W.

G. Smith, Jr.

- Bridgman R.

C. Callen G. Bruchmann G. Charnoff NRC Resident Inspector

- Bridgman A. B. Davis

- Region III

Attachment 1 for AEP:NRC:0971E Page 1

INDIANA MICHIGAN POWER DONALD C.

COOK NUCLEAR PLANT Attachment to 10 CFR 21 Letter Environmental uglification of Tor ue Switches

~Back round and Discover of Defect Acceptable types of materials used in the switch body and dielectric of Limitorque valve operators were presented as a

portion of environmental qualification training given to plant personnel.

This training identified the acceptable types of torque switch materials to be limited to white melamine, brown fibrite, and red or black durez.

Plant maintenance personnel recalled a fourth type of material (also brown in color) used in installed Model SMB-00 valve operators.

The material appears to be a laminated phenolic.

These switches can be mistaken for the qualified fibrite switches because of their brown color.

Thus, the potential exists for torque switches which have not been qualification tested.

A review of Limitorque Model SMB-00 valve operators in use at Cook Nuclear Plant revealed a total of 70 such operators.

Condition Repoit (Deficiency Report) 12-3-88-0450 was initiated on March 25, 1988 to investigate the qualification of these valve operators.

A suspect torque switch was sent to Limitorque Corporation and was analyzed.

The Limitorque Corporation review revealed that this torque switch design (1) was used during the first few years Model SMB-00 was produced and (2) has not been qualification tested for nuclear safety related service.

Notification of this finding was received by American Electric Power Service Corporation on March 30, 1988.

Corrective Action The untested torque switches will either be replaced during the next respective Unit 1 and Unit 2 refueling outages or the existing torque switch design will be confirmed to be qualified by an acceptable test.

Locations of Tor ue Switches Limitorque Model SMB-00 valve operators using the untested laminated phenolic material in the torque switch design are potentially installed on the following Cook Nuclear Plant valves:

C

~,

Attachment 1 for AEP:NRC:0971E Page 2

Valve Number U~nit s

~Orl inal

~Nu lier CMO-419 CMO-429 IMO-212 IMO-222 ICM-260 ICM-265 IMO-262 IMO-263 IMO-270 IMO-275 IMO-312 IMO-322 IMO-314 IMO-324 IMO-324 IMO-320 IMO-330 IMO-331 IMO-360 IMO-361 IMO-362 IMO-910 IMO-911 MCM-221 MCM-231 NMO-151 NMO-152 NMO-153 QCM-250 QMO-225 QMO-226 VMO-101 VMO-102 WMO-721 WMO-722 WMO-723 WMO-724 WMO-725 WMO-726 WMO-727 WMO-728 1 and 2

1and2 1 and 2

1 and 2

2 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 and 2

1 2

1 2

1 2

1 2

CCW from RHR Heat Exchanger CCW from RHR Heat Exchanger CTS Pump Eductor/Mini Flow CTS Pump Eductor/Mini Flow SI Pump Discharge SI Pump Discharge SI Pump Mini Flow/RWST Return SI Pump Mini Flow/RWST Return SI Pump Discharge Cross-Tie SI Pump Discharge Cross-Tie RHR Pump Mini Flow RHR Pump Mini Flow RHR Pump Discharge Cross-Tie RHR Pump Discharge Cross-Tie RHR Pump Discharge Cross-Tie RHR Pump Suction from RWST RHR Sprays RHR Sprays SI/CCP Suction Cross-Tie SI/CCP Suction Cross-Tie SI/CCP Suction Cross-Tie CCP Suction From RWST CCP Suction from RWST Main Steam to AFW Terry Turbine Main Steam to AFW Terry Turbine Pressurizer PORV Block Valve Pressurizer PORV Block Valve Pressurizer PORV Block Valve RCP Seal Return CCP Mini Flow CCP Mini Flow CEQ Fan Suction (H2 Skimmer)

CEQ Fan Suction (H

Skimmer)

Diesel Generator After Coolers ESW Diesel Generator After Coolers ESW Diesel Generator After Coolers ESW Diesel Generator After Coolers ESW Diesel Generator After Coolers ESW'iesel Generator After Coolers ESW Diesel Generator After Coolers ESW Diesel Generator After Coolers ESW Centerline Centerline Wallworth Wallworth Wallworth Wallworth Westinghouse Westinghouse Wallworth Wallworth Westinghouse Westinghouse Anchor Darling Westinghouse Anchor Darling Westinghouse Wallworth Wallworth Westinghouse Westinghouse Westinghouse Westinghouse Westinghouse Rockwell Rockwell Westinghouse Westinghouse Westinghouse Westinghouse Westinghouse Westinghouse Fisher Fisher Centerline Centerline Centerline Centerline Centerline Centerline Centerline Centerline