ML17352B139

Part 21 Rept Re Mechanical Defect in Shaft Length of Some HEA63 Lockout Relays Mfg Between 1990-94.Defect Identified Could Possibly Result in Binding of Front Shaft.Suspect Relays Checked for Date Codes & Replacements Ordered

ML17352B139
Person / Time
Site:	Turkey Point
Issue date:	04/28/1995
From:	Nuding M MKW POWER SYSTEMS, INC.
To:	Murley T Office of Nuclear Reactor Regulation
References
REF-PT21-95 NUDOCS 9505090038
Download: ML17352B139 (9)

Text

(ACCELERATED RI DS P ROC ESSIVE G REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9505090038 DOC.DATE: 95/04/28 NOTARIZED: NO DOCKET FACIL:50-250 Turkey Point Plant, Unit 3, Florida Power and Light C 05000250 50-251 Turkey Point Plant, Unit 4, Florida Power and Light C 05000251 AUTH. NAME AUTHOR AFFILIATION NUDING,M. MKW Power Systems, Inc.

RECIP.NAME RECIPIENT AFFILIATION MURLEY,T. Office of Nuclear Reactor Regulation (Post 941001)

SUBJECT:

Part 21 rept re mechanical defect in shaft length of some HEA63 lockout relays mfg between 1990-94.Defect identified could possibly result in binding of front shaft. Suspect relays checked for date codes & replacement(s) ordered.

DISTRIBUTION CODE: IE19T COPIES RECEIVED:LTR ENCL SIZE:

TITLE: Part 21 Rept (50 DKT)

NOTES RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL PD2-1 PD 1 1 CROTEAU,R 1 1 INTERNA q~~E C 1 1 NRR/DOPS/OECB RES/DSIR/EIB 2 2 ARR DOTS/TSIB/B 1 1 1 1 RGN1 1 1 RGN2 1 1 RGN3 1 1 RGN4 1 1 SECY/PDR 1 1 EXTERNAL: INPO RECORD CTR 1 1 NOAC SILVER,E 1 1 NRC PDR 1 1 NUDOCS FULL TXT 1 1 qH(S ~

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FULL TEXT CONVERSION REQUIRED TOTAL NUMBER OF COPIES REQUIRED: LTTR 16 ENCL 16

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April 28, 1995 i

Thomas Murley Director Office of Nuclear Reactor Regulation 11555 Rockville Pike Rockville, MD 20852

Reference:

Report No. 10CFR21-0072 Subject'. Reportable defect with General Electric HEA 63 lockout relay

Dear Mr. Murley:

MKW Power Systems'eport 10CFR21-0072 is attached which addresses a 10CFR21 reportable defect with the General Electric type HEA63 lockout relay.

This report is also being mailed to Florida Power 6 Light Turkey Point plant, our only customer affected by this notification.

Yours very truly, MKW POWER SYSTEMS, IN'ichael Nuding General Manager Quality Assurance MN.dg Enclosure 9505090038 950428 PDR ADOCK 05000250 S PDR Post Office Box 1928 ~ Rocky Mount, North Carolina 27802-1928 ~ Phone: (919) 977-2720 TWX: (510) 929-0725 ~ FAX: (919) 446-3830

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Report No. 10CFR21-0072 April 28, 1995 10CFR21 REPORTING OF DEFECTS AND NON-COMPLIANCE COMPONENT: General Electric HEA63 Lockout Relay with electric reset SYSTEM: Diesel Generator control system CONCLUSION: Defect is Reportable in Accordance with 10CFR21 PREPARED BY DATE . 4/ZE/9W Donald D. aleazzi Engineeri g Manager PREPARED BY:

Michael Nuding General Manager, Quality Assurance

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REPORT NO. 10CFR21-0072 PAGE: 1 OF 2 MKW Power Systems received notification on 4/24/95 from General Electric (see Exhibit 1) about a reported mechanical defect in the shaft length of some HEA63 lockout relays manufactured between 1990 and 1994. The problem was corrected in September 1994.

General Electric HEA63 lockout relay.

Florida Power and Light Turkey Point MKW SO¹ PART¹ CUST PO¹ SHIP-DATE QTY 500148 12HEA63C240X2 B88636 90030 02-12-90 504216 12HEA63C240X2 C91663 90073 10-03-91 506834 '2HEA63C240X2 C92659 90391 02-25-93 30122 12HEA63C240X2 C91663 90073 02-04-94 DRZXCT The defect has been identified as a short front shaft which connects the HEA handle to a floating coupling on the rotary solenoid. This can result in binding of the front shaft should disconnect from the rotary solenoid.

if it

1) Check the suspect HEA63 relays for the date codes listed below. The date codes are located on the back of the relay.

1990: NE~ OE, PE, RE, SE, TE, UE, VE) WE) XE, YE, ZE 1991: NF, OF, PF, RF, SF~ TF~ UF~ VF, WF, XF, YF, ZF 1992: NG, OG, PG, RG, SG, TGg UG~ VG~ WG~ XG~ YG~ ZG 1993) NHg OHg PHg RHg SHg THf UH, VH, WH, XH, YH, ZH 1994: NIg OIg PIg RIJ SIf TIg UI', VI, WI

2) Perform the Inspection Procedure contained in Exhibit 1 on any relays identified, as suspect in accordance with the above date codes. Order replacement shaft ¹0286A5616Gl to correct any relays found to be defective.

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REPORT NO. 10CFR21-0072 PAGE: 2 OF 2 EXHIBIT 1 (1 page)

GENERAL ELECTRIC NOTIFICATION LETTER TO MKW POWER SYSTEMS

GE Protection

& Control r li/0 Protection & Control SMi '~}aiag ivy@ rhfhl Genera/Electric Company t,tryer PPg}'g SYSI'Fjbt13r IL 205 Great Vatley Parinway. Malvern. PA 19355-1337 ERVI EADVI E LETrE

Subject:

HEA63 Lockout Relay Gtj ZAEZ~3KK Issued by: Customer Service Number: 511.1 Prepared by: J. Kennedy Date: April 10, 1995 ly~l'.Yhf&*dl1'Sgf6 One utility has reported an incident in which an HEA63 failed to operate. The HEA63 is a lockout from the rotary solenoid used for resetting the f hWh The root cause was identified as a short front iChd shaft. The front shaft connects the HEA handle to a floating coupling on the rotary solenoid.

(These parts are used only in the electric reset model, HEA63)..Manufacturing and inspection procedures were revised in September, 1994 to preclude a reoccurrence of this condition.

The utility later checked a large number of other HEA63 relays and found 10 with shafts short enough to potentially misoperate. Date codes found on the relays with short shafts covered the eriod between 1990 and 1994. These shafts are cut to length, per order, in our factory from long engths of shaft material. Each one is individually measured and cut by a machine operator. Even though the problem is not generic, we are informing customers through this letter because of the critical role of the HEA in protection systems.

Users of HEA63 relays may choose to check for the condition described above using the inspection procedure given below. Only HEAs with electric reset need to be checked for this condition. This mcludes special models of the electric reset relay: HEA99AA, AC, AD, AK, AN, BB, BD, BH, BJ, BK, BL, BM, BN, and BR.

NOTE: HEA61 and HEA62 series relays are not electric reset. Therefore they are not affected by this service advice letter.

Inspection Procedure:

1. Check amount handle and front shaft can be rotated without rotating the coupling.

(Use this information as reference for Step 5.)

2. Manually reset the relay.

3. Push handle Grmly toward rear of relay. This will remove all slack along the axis of shaft. If handle bottoms on escutcheon, remove handle.

4. PuH shaft Qrmly toward front of relay. Reinstall handle, ifremoved.

5. Repeat Step 1. A significant increase in rotation, e.g., 15 - 90 degrees indicates the shaft may have disconnected from its coupling and has the potential to cause misoperation of the HEA.

Replacement shafts are available and can be ordered on a no-charge basis until May 1, 1996. Order one kit for each HEA'found with a short shaft.

For models ending in X2: order kit 0286A5616G1 For models ending in X12: order kit 0286A5616G3 For models ending in X16: order kit 0286A5616G2 For models ending in X24: order kit 0286A5616G4 Field labor associated with this Service Advice Letter is the responsibility of the user.

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