ML20206G419

SER Supporting Employee Concern Element Rept Co 10505, Electrical Control Cabinets

ML20206G419
Person / Time
Site:	Sequoyah
Issue date:	11/04/1988
From:	NRC OFFICE OF SPECIAL PROJECTS
To:
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References
NUDOCS 8811220274
Download: ML20206G419 (2)

Text

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o y*'c UNITED STATES yfi NUCLEAR REGULATORY COMMISSION I

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SAFETY EVALUATION BY THE OrFICE OF SPECIAL PROJECTS Ew? tov!E CONCERN ELEwENT DEPORT CO 10505, "ELECTRICAL CONTROL CABINET 5" TENNESSEE VALLEY AUTHORITY

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$[WOF NUCLEAR PNER PLANT, UNITS 1 AND 2 DOCKER NOS. 90 3?7 AND 50-328 j

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$65ie t i

a Category:

C:nstru: tion j

l Subcate; cry:

Deterioration of Permanent Facilities (10500)

Element:

Electrical Control Cabinets as Related to Constru: tion i

Employee Concerns:

0.'-55-007-010

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The basis for Element Report C010505-50N, Rev. 2 dated October 9, 1986, is

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Sequoyah Employee Concern Od 85-007-010 which states:

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"Electrical control cabinets have been contaminated by ecnstruction i

dirt unc'. metal grindings.

This contamination entered the panels j

through the cooling vents on the top of the panels.

This is, a plant 4

wide problem, because of the heavy build-ups of dust and retal l

particles that have been allowed to accumulate on top of equipment, r

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This ;ould cause the contactor or other components to deteriorate and t

blow out or become inoperative. A specific location given is Auxiliary Building, 757 ft, elevatio't, unit unknown."

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i II.

Sum ary of Issue 1

The problem as defined by TVA is that the electrical control cabinets were contaminated by excessive dust and metal grindings, were not being properly protected nor cleaned, and the dust would adverstly affect plant operation i

by causing contactors and other electrical components to blow out or become j

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inope rati ve.

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III. Evaluation TVA conducted visual inspections of installed electrical control cabinets in i

I the auxiliary, turbine and coritrol buildings.

Discussions were Mid with

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electrical raintenae:e eersonnel to cetermine if they were aware of any r

i c.ste-e a' ; i :'r;5 :- or irsi:e electrical

entr:1 cabinets.

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i dis:vssie's e t'. tie:t*1:41 teasonr=1 revealed tr.at they ce not feel cust or

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r'etal grincings 09 or insice the control CaDinets to be a pr0ble5.

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observed on the cu'.sice of some of the Cabin 0ts.

No dust was r

dJst wa1 obst'ved on the inside of caDinets and metal grincings were not cbserved anywhere.

SS11220274 881104 f

PDR ADOCK 05000327 P

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Encitsure 3 2

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TVA reviewed Standard Practice 50A66 Revtsien 9, and concluded that paragraphs 4.0.6, 4.0.7, and a.2, Sections E and F adequately aedressed the accumulatten cf dust, feroign materials, and moisture on the inside and outsice of electrical bocrds, canels, and cabinets, IV.

Cemelusjon 3

4 The results of TVA's investigation of the concern for dust / metal grindings

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in eintricsl control cabinets indicates that it is not a proble:n at l

Secuoyat..

The NRC staff agrees with TVA's conclusion and resolution of the concern is desce.ibed in Element Report C010505-SQN.

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