ML20010B603

Deficiency Rept Re Wrong Terminal Lugs Wire Gauge Size Used on Resistance Temp Detector Wire Leads.Insp Personnel Have Been Retrained Re Detector Shipment Requirements.Bechtel & Util Have Been Informed.Also Reported Per Part 21

ML20010B603
Person / Time
Site:	San Onofre
Issue date:	07/29/1981
From:	Dowing K, Johnson B THERMON MANUFACTURING CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
REF-PT21-81 10CFR-050.55E, 10CFR-50.55E, NUDOCS 8108170322
Download: ML20010B603 (2)

Text

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ERM0 THERMON MANUFACTURING COMPANY R @s 54 100 THERMON DRIVE SAN MARCOS. TEXA5 78606.(512) 396-5401. TELEX: 77-6461

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July 29, 1981 /\DI 6 I9//N /g 2

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Mr. Karl Seyfrit -

' !j Director Region IV IA Office of Inspection and Enforcement i ' "codggG'CA I?)

United States Nuclear Regulatory Commission 4 /

611 Ryan Plaza Drive, Suite 1000 VG f Arlington, Texas 76012 gg j

Dear Mr. Seyfrit:

On June 25, 1981, T1.ermon Manufacturing Company received a letter from Bechtel Power Corporation, Los Angeles, California informing Thermon Manufacturing Company of a possible deficiency in the Thermon Heat Trace System installation utilized in the San Onofre Nuclear Generating Station, Units 2 and 3. Bechtel Power Corporation also informed Thermon that Southern California Edison had reported the incident to the Nuclear Regulatory Commission under provisions of 10CFR50.55 (e). Bechtel P..rer Corporation requested that Thermon Manuf acturing Company evaluate the situation to determine if Thermon should report to the Nuclear Regulatory Commission in accordance with 10CFR, Pa.t 21. Thermon Manufacturing Company has evaluated the situation and is submitting this report in accordance with 10CFR, Part 21.

The nature of the deficiency is that the terminal lugs utilized on the Resistance Temperature Detector (RTD) wire leads were of the wrong wire gauge size. Thermon Manufacturing ( ampany shipped a total of 475 RTD's Part Number RTD4946114P10038 (RTD-3) to the San Onofre Nucl. .r Generating Station, Units 2 and 3, San Clemente, California on Purchase Order Number V4138581. Approximately 300 of these RTD's were reported by Bechtel Power Corporation to have been inadvertently shipped with the terminal lugs attached. It is not the policy of Thermon Manufacturing Company to ship RTD's on this project with lugs attached. Resistance Temperature Detectors are terminated in the field by personnel other than Thermon Manufacturing Company.

Continued . ...

PM@MUWM%

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8108170322 010729 PDR ADOCK 05000361 S PDR HEAT TRACING SYSTEMS

Page 2 July 29, 1981 Bechtel Power Corpcration repor d to Thermon Manufacturing Company that the RTD terminations had been re orked by job site personnel. Thermon Manufacturing Company has.reind.>ccrinated our inspection personnel on RTD shipment requirements for this project to prevent the inadvertent shipment of RTD's with termi.ial lugs attached, and has informed Bechtel Power Corporation and Southern California Edison of the action taken.

Very truly yours, THERMON MANUFACTURING COMPANY ,

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Kenneth G. Downing Ben C. Johnson Vice Presi',ent - Operations Vice President - Engineering CC: Mr. Richard L. Burdick President