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 i
'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.
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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.
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The. internal CAR (CAR 94-09) has resulted'in revisions to the
'l 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-
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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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I N1 Post Office Box 1928. Rocky Mount, North Carolina 27802-1928. Phone: (919) 977-2720
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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:
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Easterday
- v. Hitchell D.
Galeazzi P.
Glandt F.
Amend D.
Hartley File CR-CD-90dle
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e 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-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
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 REPORT NO.: MP-BAS-9072300116-1 s
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.
Resistance decreases:
yes no.
-i
- C)
Remove jumper frcm 5-6 and place on 6-7.
Jumper 4-5 and i
verify resistance increases.
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:
ATE:
5/23/94
.s APPENDIX B PAGE:
2 OF 2 4.
Record the f:ll; wing infcrmat10n for the instruments used to test :ne compenent:
CALIERATION
~MSTRUMENT
- MNUFAC'"
"0 DEL =
3ERIAL d OETAILS i
All test talues are witnin specified Acceptance Criteria.
Tester Signature:
Date:
GC Signature:
Date:
Engineer's Signature:
Date: