TXX-6083, Final Deficiency Rept CP-86-24 Re Use of Unqualified Space & Motor Heaters.Initially Reported on 860410.Class 1E Circuits That Power Space Heaters Protected from Degradation.Issue Not Reportable Under 10CFR50.55(e)

Final Deficiency Rept CP-86-24 Re Use of Unqualified Space & Motor Heaters.Initially Reported on 860410.Class 1E Circuits That Power Space Heaters Protected from Degradation.Issue Not Reportable Under 10CFR50.55(e)

ML20214C771
Person / Time
Site:	Comanche Peak
Issue date:	11/14/1986
From:	Counsil W, Keeley G TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	Johnson E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
CP-86-24, TXX-6083, NUDOCS 8611210233
Download: ML20214C771 (2)

Text

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% Log # TXX-6083 File # 10110 908.3 TEXAS UTILITIES GENERATING COMPANY SKYWAY TOWER . 408 NORTH OLIVE STREET. I.B. 85 . DA1 JAB. TEXAH 76201 November 14, 1986 3]$j 3{M 3 "l1".L??? % s NOV I 81986 d.1#

Mr. Eric H. Johnson, Director Division of Reactor Safety and Projects U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 SPACE AND MOTOR HEATERS SDAR: CP-86-24 (FINAL REPORT)

Dear Mr. Johnson:

On April 10, 1986, we verbally notified your Mr. R. Hall of a deficiency involving the use of unqualified motor operator switch compartment space and motor heaters ccnnected to lE circuits which could result in degraded class IE circuitry. We have submitted interim reports logged TXX-4788 and TXX-5016, dated May 9, 1986, and September 17, 1986, respectively.

Motor operator switch compartment space heaters and motor heaters were supplied by various vendors with purchased equipment to be used as a deterrent to moisture buildup and to keep the motor windings dry until the equipment was put into service or installed in a controlled environment.

The class lE circuits that power the space heaters are protected by current interrupting or limiting devices (thermal magnetic trip elements, current transformers and fuses). Although not recognized by Regulatory Guide 1.75 as approved isolation devices, they are approved by IEEE 384 for use on control circuits. Therefore reasonable assurance exists that the busses would not have been degraded if the heaters had remained connected and failure of the heaters would not have affected the safety of plant operations.

The space heaters will be disconnected from their class IE circuitry to ensure proper isolation and separation.

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T)X-6083 November 14, 1986 Page 2 We have concluded in the event this issue had remained undetected, no condition adverse to safety would exist. This issue is not reportable under the provisions of 10CFR50.55(e). Records supporting this conclusion are available for your inspectors to review at the CPSES project site.

Very truly yours,

[k mit W. G. Counsil By: b G. S. Keeley

- W Manager,Nucleartig/~ing ens WJH/gj c - NRC Region IV (Original + 1 copy)

Director, Inspection and Enforcement (15 copies)

U. S. Nuclear Regulatory Commission Washington, D. C. 20555

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