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 Erpioyee Concern:

'4BM-5-002-003 and EX-85-154-007 i

i The bases for elemnt report 23501. Pevision 2 prepared December 3,1986, ere 1

Watts Bar Employee Concerns WBM-5-002,002 and EX-85-154-007, which respec*ively 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 "Fersonnel safety is seriously endangered by lack of disconnect switches at t

480 V welding outlets. Many personnel who connect and disconnect welding conductors to these outlets might not know if circuits are energized.

i 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."

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SU,MMARY OF ISSUE TVA reviewed this concern and found that 480 V receptacles have no effect on

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plant safety and therefore this is not a restirt issue.

NRC must verify that the TVA finding is reasonable for. restart.

I fil. EVALUATION 8

NPC and its consultant, SAIC, reviewed the TVA employee concern. TVA states l

l.tN8 that 4C0 V receptacles are used as ternporary power for plant maintenance and t

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! 90' are not supplied from. a 1E power source. The employee concern discusses

-ah maintenance persorrel safety at welding outlets.

TVA has reviewed OSHA i

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

"480 V Power Receptacles" and determined the adecuacy of 480 V receptacles at i

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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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