ML20086G293

Part 21 Rept Re Failure of Model 763 & 763A Static Pressure Transmitters.Caused by Short Circuit in Connector Pin to Adjacent Mounting Screw.Engineering Drawings & Mfg Work Instructions Changed & Stock Purged of Subj Transmitters

ML20086G293
Person / Time
Site:	Wolf Creek
Issue date:	11/21/1991
From:	Murphy R ITT BARTON
To:	NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS)
References
REF-PT21-91 NUDOCS 9112050015
Download: ML20086G293 (2)

Text

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ITT Fluid Techo.: fogy Corporation Barton 90C South Turnbull Canyon Road skyerr,sszphy PC. Box 1882 Gwral Manage' City oflodustry. CA 91749 1882 Telephone:(818) 9612547 November 21,1991 Tele,87 7475 4

U.S. Nuclear Regulatory Commission  !

Washington, D.C. 20555 )

Attn: Director, Office of Nuclear Material and Safeguards l l

L

Subject:

Report of Potential Defect ITT Barton is a supplier of basic components to the nuclear power industry. The specific components being reported are our Model 763 and 763A Static Pressure Transmitters.

This report is being submitted as a result of a Management Evaluation Iteport i received from Wolf Creek, which describes their analysis of a failure during plant operation. A review has been conducted by Harton Engineering which i substantiates the findings reported.

The reported failure .was the result of a short circuit of a connector pin to an adjacent mounting screw (see attached sketch). The pin would normally be clipped off during manufacturing to avoid a short. However, documentation was not updated to reflect this requirement.

l Engineering drawings and manufacturing work instructions are being changed l to provide clear direction to clip the connector pin and to inspect the pin upon l

completion. Existing stock will be purged to assure implementation of these changes. Instructions will b^ provided to all users for corr,ection of the deGeiency E in. delivered instruments. All 'of these actions will be completed by l December 20,1991.

A list of customers and the serial numbers of products which could be affected will be provided by December 5,1991. Information will be provided to all customers with instructions far inspection to determine if corrective action is

j. required.

Sincerely, y Yuc b lLh y 7

)n po nolt Roger F. Murphy General Manager y+f/

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' CONNECTOR PIN

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l IS: POTENTIAL INTERFERENCE OF UNCLIPPED CONNECTOR '

PIN WITH SCREW HEAD u ut

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SHOULD BE: CLIPPED CONNECTOR PIN v