ML20023B188

Final Significant Const Deficiency Rept 42 Re Type Hma Auxiliary Relays Mfg from 1976-June 1981.Initially Reported on 811207.Corrective Actions Complete,Per GE Svc Advice 721-PSM-166.1

ML20023B188
Person / Time
Site:	Waterford
Issue date:	12/14/1982
From:	Maurin L LOUISIANA POWER & LIGHT CO.
To:	Jay Collins NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, W3I82-0131, W3I82-131, W3I82-13155E, NUDOCS 8212270130
Download: ML20023B188 (3)

Text

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LOUISIANA 142 MARONN SWU POWER & L1GHT p O box 6008

• NEW ORLEANS, LOUISIANA 70174 . (504) 366 2345 sc

'#TONsysY[U ut December 14, 1982 t. v uAunin

+ce Pressdent Nuclear Operatoons W3I82-0131 Q-3-A35.07.42 Mr. John T. Collins, Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

SUBJECT:

Waterford SES Unit No. 3 Docket No. 50-382 Significant Construction Deficiency Report No. 42 "HMA Auxiliary Relays" Final Report

REFERENCE:

LP&L Letter W3182-0026 dated September 9, 1982

Dear Mr. Collins:

In accordance with the requirements of 10CFR50.55(e), we are hereby providing two copies of the Final Report of Significant Construction Deficiency No. 42, "HMA Auxiliary Relays."

If you have any questions, please advise.

Very truly yours, vl l[2& us L. V. Maurin f$

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LVM/ MAL:keh Attachment cc: 1) Director 3) E. Blake Office of Inspection & Enforcement U. S. Nuclear Regulatory Commission Washington, D. C. 20555 (with 15 copies of report)

2) Director 4) W. Stevenson Office of Management Information and Program Control U. S. Nuclear Rcgulatory Commission Washington, D. C. 20555 (with I copy of report) 8212270130 8212l'4 _

l PDR g ADOCK 05000382 PDR

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FINAL REPORT OF SIGNIFICANT CONSTRUCTION DEFICIENCY NO. 42 HMA AUXILIARY RELAYS" INTRODUCTION I This report is submitted pursuant to 10CFR50.55(e). It describes a l deficiency in Type HMA Auxiliary Relays as manufactured during the period from 1976 through June, 1981. The problem is considered reportable under i the requirements of 10CFR50.55(e). l t

To the best of our knowledge, this problem has not been identified to the l Nuclear Regulatory Commission pursuant to 10CFR21. f DESCRIPTION OF PR BLEM General Electric sent a Service Advice Notice No. 721-PSM-166.1 on December f 7, 1981, notifying Ebasco of a possible deficiency in Type HMA Auxiliary '

Relays manufactured during the period from 1976 through June, 1981. It had been determined that the length of the uninsulated flexible leads connected to the moveable contacts of some HMA Relays exceeds the allowable dimensions j and can result in reduced spacing between the leads and the coil circuit j terminals. The reduced spacing introduces the possibility of circuit  ;

connection between the flexible leads of the HMA contact circuits and the  !

adjacent coil circuit terminals.

l Nonconformance Report No. W3-3361 was initiated by Ebasco on January 6, 1982. f i

A survey has been conducted for use of the identified Type HMA Relays and a i listing of the switchgear affected has been compiled:

6.9 KV-3B1 4.16 KV-3A2, 3A4, 3B2, 3B4, and 3AB3  ;

480V - 3A31, 3B31, and 3B32 SAFETY IMPLICATIONS ,

Engineering evaluation indicates that a relay malfunction could result in  !

the failure of both onsite emergency sources of AC; thus, the condition of [

GDC 17 of 10CFR50, Appendix A, would not be satisfied. Therefore, the  !

present HMA Relays, if left uncorrected, could present a safety hazard, f r

CORRECTIVE ACTION TAKEN

• t All corrective action has been completed on all HMA Relays identified by {

GE Service Advice 721-PSM-166.1. The corrective action was performed in  ;

the sequence specified in steps 1 through 4 of the General Electric Service Advice and the " Freedom of Operation" check was done per the requirements of step 5 as follows:

1. Remove the mounting screw from the moveable contact support at the front of the relay, then remove the top portion of the support along with the [

two captive coil springs.

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SCD 42 Page 2-

2. Place a 5/8 inch long by 0.3 inch inside diameter piece of heat shrink-able tubing over each of the moveable contacts and slide the tubing along the contacts with flexible leads and all the way into the contact terminals. The tubing vill cover the terminals and approximately 5/16 of an inch of the flexible leads.

3. Replace the moveable contacts in the contact support and position the flexible leads in the lead slots in the support. Reassemble the contact support, springs and mounting screw. The screw should be tightened suf-ficiently to compress the lockwasher under the head of the screw.

4. Shrink,the tubing about the terminals and flexible leads by applying moderate heat, in the order of 105'C, from a source such as an electric air gun.

5. Check freedom of operation of the relay by depressing and then releasing the contact support assembly. The support assembly should snap back to its original position when it is released and there should be no indica-tion of friction or binding.

Noncon'formance Report W3-3361, which was initiated to track and document corrective action, has been reviewed, accepted and closed as of December 7, 1982.

This report is submitted as the Final Report.

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