ML20072S005
| 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
- \
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: