ML20085E597

LER ER-76-006:on 760304,inner Bearing of Clutch (Part CND-SE-3998-22 on C-E Drawing CND-SE-998) Would Not Rotate During Replacement of Clutch Coils.Caused by Bearing Degradation Due to Overheating

ML20085E597
Person / Time
Site:	Palisades
Issue date:	03/09/1976
From:	Bixel D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-ER-76-006, LER-ER-76-6, NUDOCS 8308150412
Download: ML20085E597 (2)

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$ENSEE EVENT REPORT O CONTROL BLOCK:( l l l l l l (PLEAsE PRINT ALL REGUIRED INFORMATION) 1 8 t

PfAM UCENSE NUMBER PE TY

'- ' Oi lx l1 l pl A! L!1 l l 0 l 0l-l 0 l 0 l 0l 0l0 l-l 0 l 0l lhl1l1l1l1l l0 l1 l 7 89 14 15 25 28 30 31 32 TYPE SER$ DOC 7CT NUMBER EVENT DATE REPORT DATE O 1 CON'T l 7 8 57 l

58 l d59 W 60 l 0l 5l 0l-l 0 l 2l 5l 5l l 0 l 3l 0l hl7 l 6 l l0 l310 l 9 l 7l 6l 61 88 69 74 75 80 EVENT DESCRIPTION HE I During replacement of CRDM clutch coils, it was observed, on several CRDM clutches, J 7 89 80 3[ l that the inner bearing of the clutch (Part No CND-SE-3998-22 on CE Dvg CND-SE-3998) l 7 89 80

[OIAl l vould not rotate when turned by hand and a number of others did not rotate fraelv. l 7 89 80 35 l (ER 76-006) l 7 89 80

@l 7 89 m 80 l

C DE COMPONENT CCDE SUFRER VOLATON ME lRlBl W lC lR l D ] R ] Vl El QJ lC l hl9 l0 l J48 7 89 10 11 12 17 43 44 47 w CAUSE DESCRIPTION O l Bearing degradation appears to be the result of overheating. Rod drop time measure-j 7 89 80 0 l ments have been within specification limits during required tests. Although not j 7 89 80 1 l timed during the last shutdown, all rods dropped into the core. All bearings were l FACUTv METHOO OF STATUS  % POWER OTHER STATUS OGCOVERY DGCOVERY DESCRIPTON 1

[H_) l0 l0 l 0 l l NA l lC l l Soecial Test Insrection l 7 8 9 10 12 13 44 45 46 80 AELE ED OF EL ASE AMOUNT OF ACTMTV LCCATON CF RELEASE i2 12 I Lz] I NA I I NA l 7 8 9 10 11 44 45 80 PERSONNEL EXFCSUAES NUMBER TYPE CESCASTON 1

101 0101 LZJ l NA I 7 89 11 12 13 80 PERSONNEL INJUAIES NUMBER CESCASTON 3E l 0 l0 l 0 l l NA l 7 89 11 12 80 -

PROBABLE CONSEQUENCES gg l Continued degradation could result in inoperable CRDM (failure to drop). l 7 89 80 LOSS OR OAMAGE TO FACluTY TYPE DESCRpTON

@Wl 7 89 10 NA 80 l

PUBUCITY 1 l NA l 7 89 80 ADDITIONAL FACTORS 18 l (Cause Centd) replaced, the CRD ventilation will be improved, and an appropriate j 7 89 80 1 l inspection and/or test vill be conducted at the next refueling outage. l 7 89 80 8308150412 760309 PDRADOCKOSOOO{g s

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Campan'] ,

General offices: 212 West Micnigan Avenue, Jackson, Micnigan 49201. Area Code S17 788-0550 March 10, 1976 J

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Mr James G. Keppler Office of Inspection Enforcement

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US Nuclear Regulatory Commission "? / M 799 Roosevelt Road Glen'Ellyn, IL 60137 W

DOCKET 50-255, LICENSE DPR-20 PALISADEC PLANT, ER-76-06 CRDM CLUTCH BEARINGS

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Attached is a reportable occurrence which relates to the Pslisades Plant.

This occurrence has been classified as the performance of a component that requires remedial action or corrective measures to prevent operation in a manner less conservative than assumed in the accident analysis, safety analysis or Technical Specifications basis. It should be further noted that the event date (March h, 1976) is the date when it was determined that this occurrence was reportable.

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i David A. Bixel Assistant Nt: clear Licensing Administrator 4

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