ML19325E457

Part 21 Rept Re Potential Inconsistencies in Mac Diagnostic Sys Software.Licensee to Review All Smb,Sb & Sbd Size 3 Mac Torque Test Data Using Mac Software Version 2.96 to Insure That Torque Switch Settings Meet Valve Design Requirements

ML19325E457
Person / Time
Site:	Brunswick
Issue date:	10/20/1989
From:	Wilkinson I LIMITORQUE CORP.
To:	Office of Nuclear Reactor Regulation
References
REF-PT21-89-174-000 PT21-89-174, PT21-89-174-000, NUDOCS 8911070156
Download: ML19325E457 (5)

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., .. Limitorque Corporation Automoted Volve Actuotors and Jocks for industry-I' 6, 5114 Wooclotl Rood P.O. Dox 11318 1.ynchburg, VA 245% 1318 ,

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. Telephone-804 528 4400

• Telex-82 9448 + FAX-804 845-9736

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. October 20,1989

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g S U. S. Nuclear Regulatory Commission '

' Washington, D.C. 20555 '

,, Re: Limitorque Corporation  ;

Part 21 Notification

Subject:

MAC Diagnostic System .

Attention: Director, Nuclear Reactor Regulation Sentlemen: ,

Pur:uant to the requirements of Title 10 of the Code of Federal Regulations Part 21

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hen in provided is notification of potential inconsistencies in the MAC Diagnostic System ,

software, as detailed in the attached letter. In order to expedite the notification of the  !

'a fachities affected, Limitorque has made simultaneous written notice to both the co;nmis',lon and the attached list of nuclear utility customers.

Signed:

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r I. E. Willdnson v

' Vice President'of Engineering ,

LIMITORQUE CORPORATION

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8911070156 891020 PDR ADOCK 05000324 S PNV

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Limitorque Corporation w . - -- _- A wn ne %# ,muown :no som .o, :cei.o,y - ---

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*I 5114 Woodoll Rood P.O. Dox 11318 Lynchburg. VA 24506 1318 Vg . Telephone-804 528 4400

• Telex-82 9448

• FAX-804 845-9736

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October 20,1989 ,

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SUBJECT:

10 CFR Part 21 Notification p

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(- Be advised that Limitorque has concluded its evaluation of the reported incident at l Carolina Power & Lights' Brunswick Station and determined that it does represent the r- potential for a failure of equipment to perform under designed condidons. Therefore, L pursuant to the requirements of 10 CFR Part 21, herein is provided notification of a L defect in Limitorque supplied equipment. l l

Identification Of Basic Comoonent l

The MAC diagnostic system software contains correlation equations which convert the i spring pack force load cell measurement to an output torque value. The correlation equations were developed in a testing program where actual output torque and spring ';

pack force where measured on various size Limitorque actuators.

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October 20,1989  !

Part 21 Notification l i

Nature Of The Defect As a result of testing data collected at Carolina Power & Lights' Brunswick Plant, b Limitorque found certain inconsistencies in the MAC software output torque values for i SMB, SB, and SBD size 3 actuators. The result is that the output torque values provided by MAC under predict the output torque, torqm switch settings selected based on this test l

1 data could potentially lead to an insufficient amount of output torque available to meet -

design requirements. )

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Eauioment Effected l

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The equipment in question is all MAC torque test data for SMB, SB, and SBD size 3 )

actuators. l l

Licensee Corrective Action I

l The licensee is to review all SMB, SB, and SBD size 3 MAC torque test data using MAC l software version 2.96 to insure that the torque switch settings meet the valve design  ;

' requirements.

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L Limiteraue Corrective Action 1

Limitorque has performed additional correlation testing on the SMB, SB, and .

SBD size 3 to verify the correct relationship between output torque and spring pack force. l The MAC software was revised to include the correct correlation equation for the size 3 l actuator, the revised software is version 2.96. We have also reviewed all of the test l data for the other MAC correlation equations to verify their accuracy. '

o A copy of this notification has been sent to the NRC under a separate cover letter. i 1

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i Page 3-October 20.1989.

Part 21 Notification i This Part 21 Notice is being sent to the licensing or quality assurance department of each of the MAC owners. A copy of this Notice with a copy of the 2.96 software and  ;

instructions are a%o being sent directly to our contact in the maintenance department. I l

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C- -  % l l I. E. Wilkinson l 1

Vice President of Engineering '

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LIMITORQUE CORPORATION  ;

p cc: Mr. Mignogna Mr. Kornsey Part 21 Notification File l l-1 1 l l

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Y- W.' E. Steiger

, Plant Manager Iong Island 13ghting Company.- Shoreham P. O. Box 618 1

. Wading River, NY 11792 TJ. T. Beckham, Jr.

Vice President 3 Georgia Power Company Edwin I. Hatch Plant #2 P. O. Box 439 Baxley, GA 31513 G.- Bockhold l' General Manager Geoqgia Power Company - Vogtle Plant Old River Road L , Waynesboro, GA 30830 I. Otis Berkham l- Vice President Procurement & Materials

/ - Georgia Power Company l P. O. Box 4545 '

[ Atlanta, GA. 30302 E

l .R. E. Lumsden L Manager Quality Assurance

, Camlina Power & Light L- P. O. Box 1151 Raleigh, NC 27602 ,

Sub Dasgupta Manager Procurement and Quality Control Surveillance

. Babcock & Wilcox 3315 Old Forest Road 3

Lynchburg, VA 24501 Hisashi Nakamura

. Nippon Gear Ltd.

7 Kirihara cho

-. Fujisawa shi, Kanagawa ken Japan-1,

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