ML20095K830

Final Deficiency Rept,Item 126 Re Underrated Terminal Blocks in Limitorque Motor Operated Valve Operators.Initially Reported on 840504.Twelve Terminal Blocks Removed.Four Motor Operators Hard Wired

ML20095K830
Person / Time
Site:	Fermi
Issue date:	08/15/1984
From:	Jens W DETROIT EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
126, EF2-69670, NUDOCS 8408300061
Download: ML20095K830 (3)

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' August 15, 1984 EF2-69 670.

Mr. James G.

Keppler-Regional Administrator

. Region III U.

S.' Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois -60137

Reference:

(1) Fermi 2 NRC Docket No. 50-341 (2) Letter, W. H. Jens to J. G.

Keppler, May 16,-1984, EF2-69536 (3) Letter, W.

H. Jens to J. G.

Keppler, June 4, 1984, EF2-68549

Subject:

Final Report of.10CFR50.55(e) Item 126

" Underrated Terminal ~ Blocks in Limitorque Valve Operators" This is Detroit Edison's final report concerning underrated terminal blocks in motor operated valve operators manufac-tured by Limitorque.

This item was originally reported as a

-potential deficiency on May 4, 1984, and was subsequently documented in Reference (3).

Description of Deficiency Detroit Edison identified the use of Beau Products No.

76000 series terminal blocks, which were underrated for their application, as a result of an inspection program.for all NUREG 0588 Appendix E, Category 2A and 2B Limitorque operators.

There are eighty-eight (88) Category 2A and 2B Limitorque operators'with thirteen.inside containment and seventy-five outside containment.

This inspection program was implemented as the corrective action for a previously reported deficiency,'10CFR50.55(e) Item:125 " Environmentally Unqualified Terminal Blocks-in Limitorque Valve Operators."

Item 125 was' documented in a final report (Reference 2) on May ~ 16, 19 84.

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-Mr.1 James G.

Keppleri

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iAugust 15,.1984 i

. EF2-69 6 70 e

-Page 2 (The terminal blocks, which were-underrated for their_ appli-cation,' were being used 'in 480V AC motor terminations,. but according to the Beau Products catalogue have,an:Under--

writers. Laboratory (UL) rating-of 150V AC.

This lowerv rating 31s ' based on creepage and-clearance distances 'for u

Class C General' Industrial terminal' block applications as delineated"in UL' Standard 1059.-

The Limitorque Motor Operator model SMC-04 has a ~ smaller limitswitch termination compartment than other Limitorque operators.

.The smaller ' sized Beau 76000 terminal blocks were found in model SMC-04 operators and L were not = found in any other model Limit'orgue operator. inspected.

Therefore, Detroit Edison has concluded'that the use of Beau 76000-terminal blocks for applications for which they_ were not

' rated is limited to the SMC-04 operators..

Analysis of Safety Implications The concern with these terminal blocks is the UL rating of

'150 volts rms versus their application as motor terminal blocks which have-a 480 volt phase to phase potential, and 277 volt phase to ground potential.

Both of these values are greater than the UL rating.

Therc'is a potential for-electrical, shorting which could result in the failure of_ the motor to operate when required..

Failure of the motor.to

operate could compromise the function of.the safety system 4

of which the valve is an integral part.

Corrective' Action l

Theifollowing actions were taken to correct this; deficiency i

and prevent recurrence:

-o.,

An; inspection of'all NUREG 0588 Appendix E, category 2A l

and 2B Limitorque ' valves was performed.

This inspec-

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t tion revealed that twelve operatcrs contained under-rated Beau 76000 series terminal. blocks.

The twelve f

underrate'd Beau 76000 series terminal blocks were in SMC-04_ motor operators only and these; terminal blocks were demoved.,' It should :be noted that all QA Level I 1

SMC-04 Motor operators were= included in the inspection L_

which11dentified'this deficiency.

.Four motor, operators t

were corrected by hard' wiring using Raychem termina-

'tions.within Crouse Hinds,LR form.8 conduit. bodies.

Eight of :the 'af fected terminal blocks will: be replaced L

with-Kulka 622-5 terminal ~ blocks.

TheLtype'offreplace-ment was-based upon the environmental conditions and r-

'ALARA considerations.

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' ;' -' !Mr. James G. Keppler' August 15,'1984 EF2-69 6 70 Page 3 o

Beau.76000 series terminal blocks are being added to the Restricted' Engineering'Camponent List and are not approved as a replacement spare part for Limitorque valve operators.

This is Detroit Edison's final report on this item.

If ' you have questions concerning this matter, please contact Mr.

Lewis P.

Bregni, (313) 586-5083.

Sincerely,.

,/

cc:

Mr.

P.

M.

Byron Mr.

R.

C.

DeYoung Mr.

R.

C.

Knop l

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