ML20072S005

Part 21 Rept Re Failure of Motor Operated Potentiometer Mfg by Basler Electric.Qualification Testing of Units Revised & Mkw Power Sys Will Perform Site Visit at Basler Electric to Verify Adequacy of Basler Electric C/A

ML20072S005
Person / Time
Site:	Clinton
Issue date:	08/18/1994
From:	Nuding M MKW POWER SYSTEMS, INC.
To:	Beaston V NRC
References
REF-PT21-94 NUDOCS 9409130386
Download: ML20072S005 (6)

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t August 18, 1994 ATTN: Virgil'Beaston .

US Nuclear Regulatory Commission i Hall Stop 0-7E4 Washington, DC ,

RE: Failure of motor operated potentiometer manufactured by Basler Electric Lof Highland, Illinois, part number 90-72300-116 model MOC 3502  ;

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'Mr. Beaston, Illinois Power identified on May 4, 1994 to MKW Power Systems the MOC j 3502 part number 90-72300-116 supplied to them under MKW Power Systems'  :

. sales order number 508936 failed to operate properly at the time of

-installation on IP's safety related Div. III diesel generator. This .

resulted in IP's issuance of a 10CFR21.21 notification letter to the USNRC on June 6, 1994. ,

MKW Power Systems conducted an investigation which revealed ~the following information: .

1. The identified unit has a silk screen schematic depicting a resistor between-terminals 1 and 4 with terminals 2 and 3 -

i shorted. a

2. Silk screen has no polarity marks. ,

3. Unit-is not wired in accordance with the silk screen. +

4. Unit has-resistance between terminals 2 and 4,-and a short-- .i between 1 and 3 terminals.

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Our investigation-has resulted in two corrective action reports, one Lissued internally to our Qualification Department, and one issued externally to Basler Electric describing the incorrect. schematic and internal wiring. 1

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The. internal CAR (CAR 94-09) has resulted'in revisions to the 'l

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Lqualification testing of these units.to detect thinitype of defect.

The Lold and new revisions are attachments to this letter for your review.

The external CARi(CAR ~94-08) issued to Basler Electric is'under- ~

investigation and should.be~ resolved byfAug. 30, 1994. . MKW willEperform a cite' visit at Basler Electric to' verify adequacy-of their corrective cctions.

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Post Office Box 1928. Rocky Mount, North Carolina 27802-1928. Phone: (919) 977-2720

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9409130386 940819 . TWX: (S10) 929-0725 . F AX: (919) 446-3830 .

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As part of the NUPIC Audit team visiting HKW Power Systems during the waek of Aug. 8, 1994, Illinois Power has reviewed our internal actions and in holding RCA194-00-02'open pending verification by HKW that Basler corrective action is complete.

A review of the computer base of customer orders has verified Illinois Power is the sole receiver of part number 90-72300-116 model number MOC 3502, also no similar qualifications of safety related components exists at Power Systems.

I apologize for my tardiness in generation of this correspondence.

This was due in part to investigations completed Aug. 17, 1994 to support this response.

Sincerely,

~/M L } A fi A ko Michael Nudling ,

GHQA HBN/jbg Enclosure c: T. Easterday

v. Hitchell D. Galeazzi P. Glandt F. Amend D. Hartley File ,

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- REPORT NO.: MP-BAS-9072300116-1 REVISION: 0

, DATE: 2/2.'94 APPENDIX B PAGE 1 0F 2 TEST PROCEDURE COMPONENT: Motor Operated Potentiometer P/N: 90-72300-116 MANUFACTURER: Basler Electric Box 269, Route 143 Highlands, Illinois 62249 L. TEST SET UP:

(A) One (1) 125 VDC power ecurce.

(B) One (1) resistance decade box.

2. PROCEDURE:

(A) Using an ohmmeter, verify the resistance of the potentiometer when measured across terminals 14-16 is 157.5 to 192.5 ohms. Record actual value below- 1 i

14-16 Resistance: ohm.

(B) Jumper terminals 5-6 and 3-6. With an ohmmeter across  !

terminals 14-15: connect 125 VDC to terminals 1-2,  :

connect jumper between terminal 4-7, and verify J l

resistance decreases.

Voltage: VDC. )

Resistance decreases: yes ___ no.

(C) Remove jumper from 5-6 and place on 6-7. Jumper 4-5 and verify resistance increases.

Resistance increases: yes no.

(D) Remove 125 VDC and all jumpers.

3. Attach device serial number identification. Use format MK-IWO-1,2 (etc.)

S/N: .

Attacnment 2

2 s

REPORT NO.: MP-BAS-9072300116-1 REVISION: 0

, DATE: 2/2/94 APPENDIX B PAGE 2 OF 2

4. Record the following information for the instruments used to test the component:

CALIBRATION INCTRUMFNT HANUFACT. MODEL SERIAL # DETAILS All test values are within specified Acceptance Criteria.

Tester Signature: Date:

QC Signature: Date:

Engineer's Signature: Date:

REPORT MO.: MP-BAS-9072300116-1 REVISION: 1

- DATE: 5/23/94 APPENDIX 5 PAGE: 1 0F 2 TEST PROCEDURE COMPOMENT: Motcr Operated Potenticmeter P/N: 30-72300-116 MANUFACTURER: Basler Electric Box 269. Route 143 Highlands, :llinois 62249

1. TEST SET UP:

A) One (1 125 VCC cower source.

'5) One ': resistance decace box.

2. PROCEDURE:

(A) Using an ohmmeter, verify the resistance of the potenticmeter when measured across terminals 14-16 is 157.5 to 192.5 ohms. Record actual value below:

14-16 Resistance: ohm.

(B) Jumper terminals 5-6 and 3-6. With an ohmmeter across terminals 14-15: connect 125 VDC to terminals ltyf and 2 (h.), , connect jumper between terminals 4-7, and verify resistance decreases.  !

Voltage: VDC. l l

Resistance decreases: yes no. l

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C) Remove jumper frcm 5-6 and place on 6-7. Jumper 4-5 and i verify resistance increases. i Resistance increases: yes no.

D) Remove 125 VDC and all jumpers.

3. Attaca device serial numcer identification. Use format MF.-IWO-1._ fetc.:  ;

j 3/N: .

%ttachment 3

REPORT MO.: MP-EAS-9072300116-1 REVISION: .

,, .s ATE: 5/23/94 APPENDIX B PAGE: 2 OF 2 .

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4. Record the f:ll; wing infcrmat10n for the instruments used to test :ne compenent:

CALIERATION

~MSTRUMENT :MNUFAC'" "0 DEL = 3ERIAL d OETAILS I i

All test talues are witnin specified Acceptance Criteria.

Tester Signature: Date:

GC Signature: Date:

Engineer's Signature: Date: