ML20064G339
| ML20064G339 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 03/07/1994 |
| From: | Kovalcik J COMPUTER PRODUCTS, INC. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| REF-PT21-94 NUDOCS 9403160131 | |
| Download: ML20064G339 (2) | |
Text
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q CDMPUTER' r-PRODUCTS racctss A tt roulrion March 7, 1994.
Document Control. Desk US. Nuclear Regulatory Commission
' Washington, DC 20555
Dear Sir:
This letter is official notification in accordance with 10CFR21.21 of a deviation to specification. ' Computer Products, Inc._(CPI)~has identified that the RTP Universal Input / Output Controller Interface: Card utilized in the Universal I/O Controller (UIOC), which is supplied for installation into U.S.
Nuclear Generating facilities, does not meet elevated operating temperature specifications as published.
As of the writing of this letter we have determined that the affected re"'.sion has been supplied for installation at:
.o Texas Utilities Electric - Comanche Peak, (CPI's' immediate customer SAIC, Huntsville, Alabama)
Model'#: NEQ7431/60-002 - Shipped quantity 4,' September 1991.
Shipped quantity 1, April 1992.
Shipped quantity 4, October 1992.
Total quantity 9.
o Yonggwang Nuclear Power Plant (YGN) Units 3 &4 (CPI's immediate customer ADB/ Combustion' Engineering, Windsor, l
Model #: NEQ7431/60-002 - Shipped quantity 20, August:
1989.
'The deviation is caused by increased component susceptibility, at-ambient ' temperatures above 90"F, to circuit anoma' lies.'
The effect of the anomalies are on a component of the 021-5282-000 circuit board sub-assembly.
These effects are attributed to the circuit layout of.the 021-5282-000-Revision E, circuit board.
The circuit board sub-assembly is-a interface card which plugs
'into the NEQ7431/60-002 UIOC chassis.
The suspect units canube-identified by Computer Products part number NEQO21-5282-000
'EnYision E only.
j l
This deviation does not affect the normal operation of the j
circuit' cards or controller chassis; however, infa environment-j where temperatures exceed 90*F, these units will not perform as
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specified.
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1 Hodel Number Breakdown Model # NEQ7431/60-002 consists of part #'s:
1 Chassis, Universal Input / Output NEQ070-5089-002 Controller (UIOC)
NEQO21-5282-000 Rev. E - Circuit Card, UIOC Interface Card The design has been corrected through a Engineering Change Order (ECO) adding two filter capacitors.
These capacitors slow signal rise times. preventing the effects of circuit anomalies which cause the deviation.
The ECO changed the revision of the 021-5282-000 to revision E1.
Computer Products, Inc., as a supplier, does not feel that we have the capability to perform an evaluation as to the effect this deviation may have regarding whether or not a substantial safety hazard exists.
If the utility (operator) decides that corrective action is required on delivered units, access to the 021-5282-000 circuitry is necessary and will require shutdown and removal of the circuit board sub-assembly from the UIOC chassis and system.
Computer Products, Inc. is simultaneously notifying. Texas Utilities, SAIC, and APB/CE of this deviation.
Sincerely, gunk /
&Q
~3ack Kovalcik Director, Quality Assurance and Manufacturing Technology cc:
Sal Provanzano, President Computer Products, Inc., Process Automation Division d
JK/jn
.