ML20064G326

Part 21 Rept Re RTP Universal I/O Controller Interface Card Utilized in Universal I/O Controller Supplied for Installation at Comanche Peak.Design Corrected Through Engineering Change Order Adding Two Filter Capacitors

ML20064G326
Person / Time
Site:	Comanche Peak
Issue date:	03/07/1994
From:	Kovalcik J COMPUTER PRODUCTS, INC.
To:	TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
References
REF-PT21-94 NUDOCS 9403160119
Download: ML20064G326 (2)

Text

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- kOMPUTER '

? c4 PRODUC[5 P R O C E S S A U T O M A ll0 N March 7, 1994 Texas Utilities Electric Co.

Comanche Peak 5 miles northwest of Glen Rose Highway 56 Glen Rose, TX 76043 Attn: Station Manager Pear 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.

We have determined that the affected revision has been supplied for installation at Texas Utilities Electric - Comanche Peak, through our immediate customer SAIC, Huntsville, Alabama.

Shipping history is as follows:

Model #: NEQ7431/60-002 - Shipped quantity 4, September 1991. Shipped quantity 1, April 1992. Shipped quantity 4, October 1992. Total quantity 9.

The deviation is caused by increased component susceptibility, at ambient temperatures above 90 DF, to circuit anomalies. 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 Fevision E, circuit board.

The circuit board sub-assembly is a interface card which plugs into the NEQ7431/60-002 UIOC chassis. The suspect units can be identified by Computer Products part number NEQO21-5282-000 Fevision E only.

This deviation does not affect the normal operation of the circuit cards or controller chassis; however, in a environment where temperatures exceed 90*F, these units will not perform as specified, idOO1 a Crrfr*f % tr; S]G GrN.4 Dm fD ';A b:C f wGd 3G P H O N E 305 Ji WO rA: 305 9 0 7371

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ligdel Number Breakdgwu Model # NEQ7431/60-002 consists of part #'s:

NEQ070-5089-002 - Chassis, Universal Input / Output 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.

In accordance with 10CFR21.21, Computer Products, Inc. is simultaneously notifying the Nuclear Regulatory Commission and SAIC of this deviation.

Sincerely,

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'- ' Jack Kovalcik Director, Quality Assurance and Manufacturing Technology JK/jn