ML17333A844

Part 21 Rept Re Limitorque Torque Assembly Used in SMB-00 Valve Actuators That Were Missing Spacer.Replaced or Repaired Defective Assemblies by Addition of Spacer

ML17333A844
Person / Time
Site:	Cook
Issue date:	04/09/1997
From:	Fitzpatrick E AMERICAN ELECTRIC POWER CO., INC.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-PT21-97 AEP:NRC:0971H, AEP:NRC:971H, NUDOCS 9704150068
Download: ML17333A844 (8)

Text

CATEGORY 1 REGULATORZiNFORNATZON DZSTRZBUTZON 'EN (RZDS)

ACCESSION NBR:9704150068 DOC.DATE: 97/04/09 NOTARIZED: YES DOCKET FACIL,:50-315 Donald C. Cook .Nuclear Power Plant, Unit 1, Indiana M 05000315 50-316 Donald C. Cook Nuclear Power Plant, Unit 2, Indiana M 05000316 AUTH. NAME AUTHOR AFFILIATION FITZPATRICK,E.E American Electric Power Co., Inc.

RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Part 21 rept re Limitorque torque assembly used in SMB-00 valve actuators that were missing spacer.Replaced or repaired defective assemblies by addition of spacer.

DISTRIBUTION CODE: IE19T COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Part 21 Rept (50 DKT)

NOTES: E RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD3-3 PD 1 1 HICKMANFJ 1 1 INTERNA  : FILE CENTER 01 1 1 NRR/DISP/PSIB/B 1 1 NRR'/DRPM/PECB 1 1 PDR WARD, M. 1 1 RES/DET/EIB 1 1 RGNl 1 1 RGN2 1 1 RGN3 1 1 RGN4 1 1 EXTERNAL: INPO RECORD CTR 1 1 NOAC SILVER,E 1 1 NRC PDR 1 1 NUDOCS FULL TXT 1 1 D

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NOTE TO ALL "RZDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE. TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COPIES RECEIVED BY YOU OR YOUR ORGANIZATION, CONTACT THE DOCUMENT CONTROL DESK (DCD) ON EXTENSION 415-2083 FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 15 ENCL 15

Indiana Michigan Power Company 500 CircIe Drive Buchanan, Mi 491071395 INSIANA MICHIGAN PWM April '9, 1997 AEP:NRC:0971H 10 CFR 21 Docket Nos.: 50-315 50-316 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D. C. 20555 Gentlemen:

Donald C. Cook Nuclear Plant Units 1 and 2 10 CFR 21 REPORT CONCERNING TORQUE SWITCH ASSEMBLIES In accordance with 10 CFR 21.21(c)(4), Indiana Michigan Power provides notification of defective torque switch assemblies received from Limitorque Corporation.

Initial notification of this matter was provided by facsimile to the NRC Operations Center in accordance with 10 CFR 21.21(c)(3) on March 10, 1997.

The information required by 10 CFR 21 is provided in attachment 1 to this letter.

E. E. Fitz trick Vice President SWORN TO AND SUBSCRIBED BEFORE ME THIS Q DAY OF , 1997 Notary Public My Commission Expires 4

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ATTACHMENT TO AEP:NRC: 0971H Attachment to AEP:NRC:0971H Page 1 Name and address of the individual informing the Commission:

E. E. Fitzpatrick Vice President Indiana Michigan Power Company 500 Circle Drive Buchanan, MI 49107 Identification of the facility which fails to comply or contains a defect:

Donald C. Cook Nuclear Plant, Unit 2 Indiana Michigan Power (iii) Identification of the firm constructing the facility or defect:

supplying the basic components which contain a Limitorque Corporation 5114 Woodall Road Lynchburg, VA 24506 (iv) Nature of the defect and the safety hazard which is created or could be created by such defect:

The double pole torque switch assembly used in SMB-00 valve actuators was missing a spacer. The missing spacer allowed the torque switch shaft to rotate slightly along the shaft length. This shaft rotation allowed the torque switch contacts to open. With the closed torque switch contacts open, the actuator control circuit would not allow the actuator to run in the closed direction, and therefore would not allow the valve to fully close. The actuator control circuit used only the closed set of contacts and therefore the open operation is not affected.

The seven assemblies supplied by Limitorque were placed in open stock, available for use in the next, valve requiring replacement. Therefore, the three torque switch assemblies in open stock could have been used in any number of safety related applications with unknown results. The failures in the four valves in which they were installed did not result in any safety impact.

However, this could not be guaranteed for all other SMB-00 valve actuators in the plant due to the large variety of applications for the assembly. Because is not possible to definitively evaluate all possible it applications for significant safety hazard, it was conservatively decided to submit this even't as a Part 21.

(v) The date on which the information of such defect was obtained:

March 10, 1997

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Attachment to AEP:NRC:0971H Page 2 (vi) In the case of a basic component which contains a defect, the number and location of all such components in use at the facility subject to the regulations in this part: I The double pole torque switch is a standard configuration for Indiana Michigan Power and is used extensively at the Cook Nuclear Plant in SMB-00 actuators.

Seven defective torque switch assemblies were received from the manufacturer, only four of which were installed. These assemblies were installed in valves 2-WM0-728, 1-WM0-724, 2-MM0-421, and 2-CM0-415.

With the exception of 2-CM0-415, all the valves in which the defective assemblies had been installed had either an "open" safety function (2-WMO-728 and 1-WMO-724) or were a balance of plant valve (2-MMO-421), and thus their operability was not in question.

2-CMO-415 was originally declared inoperable when the problem with the torque switch assembly was discovered and an ENS notification made. During the investigation of that event, an operability evaluation was performed for 2-CMO-415. The valve was found to have been successfully tested under dynamic conditions during the September 1966 to January 1997 interval and determined that the defective torque switch assembly it was would not have kept the valve from performing its design basis function of closing. Therefore, the valve had never been inoperable. The ENS notification for 2-CMO-415 was retracted on February 22, 1997.

(vii) The corrective action which has been, is being, or will be taken; the name of the individual or organization responsible for the action; and the length of time that has been or will be taken to complete the action:

All'our of the defective assemblies that were have either been replaced or repaired by 'nstalled addition of a spacer.

The three defective assemblies that were never installed were returned to Limitorque on March 10, 1997. These assemblies will be evaluated by Limitorque to determine the cause of the defect.

Limitorque has stated that they will also be performing failure mode analysis on the defective assemblies.

(viii) Any advice related to the def ect that has been, is being, or will be given to purchasers or licensees:

None.