ML20206G497

SER Supporting Employee Concern Element Rept 23501, 480 Volt Power Receptacles Unsafe

ML20206G497
Person / Time
Site:	Sequoyah
Issue date:	11/04/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
To:
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NUDOCS 8811220298
Download: ML20206G497 (1)

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SAFETY EVALUATION PEPORT BY THE OFFICE OF SPECIAL PROJECTS EPPLOYEE CONCERN E'. "MENT REPORT 23501 "480 V POWER RECEPTACLES UNSAFE" TENNESSEE VALLEY AUTHORITY SEQUOYAH NUCLEAR POWER PLANT, UNTTS 1 AND 2 DOCKET NOS. 50-327 AND 50-328

1. SUEJECT 1 Category: Engineering (20,000) l Subcategor;: Electrical Safety (23500)  !

l Element: '480 V Power Receptacles UAsafe (?3501) i i Erpioyee Concern: '4BM-5-002-003 and EX-85-154-007 i

The bases for elemnt report 23501. Pevision 2 prepared December 3,1986, ere ,

Watts Bar Employee Concerns WBM-5-002,002 and EX-85-154-007, which respec*ively 1

l j state, "There are no mans of disconnect provided innediately above 480 V

' receptacles to prevent flash burns caused by insertion or removing" and -

t "Fersonnel safety is seriously endangered by lack of disconnect switches at

, 480 V welding outlets. Many personnel who connect and disconnect welding  ;

i conductors to these outlets might not know if circuits are energized. ,

Percoving and inserting the plug while energized could cause an explosion and 4

could embed small rnetallic particles in the arms, face and torso of the person." l t

i II. SU,MMARY OF ISSUE .

! TVA reviewed this concern and found that 480 V receptacles have no effect on  !

) plant safety and therefore this is not a restirt issue. NRC must verify that  !

the TVA finding is reasonable for. restart.

I fil. EVALUATION .

l 8 NPC and its consultant, SAIC, reviewed the TVA employee concern. TVA states l .tN8 that 4C0 V receptacles are used as ternporary power for plant maintenance and t t

! 90' are not supplied from. a 1E power source. The employee concern discusses maintenance persorrel safety at welding outlets. TVA has reviewed OSHA i

-aho I' *n standard for 480 V receptacles and TVA Electrical Design Standard 05-E12.5.2, i

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g "480 V Power Receptacles" and determined the adecuacy of 480 V receptacles at i Secuoyah. {

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i "" M Fased on our review, we have concludeo that the erployee concern does not 90 resent a safety concern. TVA resolution of this cencern is in the domain '

.I OSHA recuirements and the National Electrical Code. Therefore, this concern is considered to be satisfactorily resolved for SeQuoyah restart. [

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