ML18352A350

Licensee Event Report ER-76-06 - Several CRDM Inner Bearing of Clutches Would Not Rotate When Turned by Hand or a Number of Others Did Not Rotate Freely

ML18352A350
Person / Time
Site:	Palisades
Issue date:	03/10/1976
From:	Bixel D Consumers Power Co
To:	James Keppler NRC/RGN-III
References
LER 1976-006-00
Download: ML18352A350 (2)

Text

.,. ~. .....

consumers

• Power company General Offices: 212 West Michigan Avenue, .Jackson, Michigan 49201 *Area Code 517 788-0550 March 10, 1976 Mr James .G. Keppler Office of Inspection Region III US Nuclear Regulatory 799 Roosevelt Road Glen Ellyn, IL 60137 DOCKET 50-255, LICENSE DPR-20 PALISADES PLANT, ER-76-06 CRDM CLUTCH BEARINGS

• Attached is a reportable occurrence which relates to the Palisades 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 4, 1976) is the date when it was determined that this occurrence was reportable.

David A. Bixel Assistant Nuclear Licensing Administrator

• j

-.~ ..

CONTROL BLOCK:

LICENSEE 1

LICENSEE EVENT REPORT

i. .1__,___._IL--.L.I.......I.I__.I LICENSE NUMBER 6

[PLEASE PRINT ALL REQUIRED INFORMATION]

LICENSE EVENT NAME TYPE TYPE

~ IM I I Ip I Al 7 8 9 LI 1 14 I I ol ol-lo 15 I ol ol olo 1-1 ol ol 25 14111111111 26 30 lo 31 Ii32I REPORT REPORT TYPE SOURCE OOCKl;T NUMBER EVENT DATE REPORT DATE

@ill CON'T I..__......__.. L1:J l1J I o I 51 ol-1 o I2 I 5 I 51 lol31ol417161 1013101211161 75 80 7 8 57 58 59 60 61 BB 69 74 EVENT DESCRIPTION lol 21 jDuring replacement of CRDM clutch coils, it was observed, on several CRDM clutches, I 7 89 00 IPl3( I that the inner bearing of the clutch (Part No CND-SE-3998-22 on CE Dwg CND-SE-3998) I 7 8 9 80 lol41 I would not rotate when turned by hand and a number of others did not rotate freely. I 7 89 00 lol51 ~I-------------------------__,...-----------------------(~ER~7~6~-o~o~6)~1 7 89 00 lolsl 7 8 9 PRIME 80 SYSTEM CAUSE COMPONENT COMPONENT CODE CODE COMPONENT CODE SUPPLIER MANUFACTURER VIOLATKJN

@:0 IRI Bl L~J le IR ID I R I vI El l.!..J IC I 419 I0 I L!J 7 8 9 10 11 12 17 43 44 47 48 CAUSE DESCRIPTION lol0I I Bearing degradation appears to be the result of <,:>verheating. Rod drop time measure]

7 8 9 80

~ I ments have been. withi~ specification limits during required_ tests. Although not 1-7 8 9 80

[I@] I timed during the last shutdown, all rods dropped into the core. All bearings were I

• 7 8 9 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY DISCOVERY DESCRIPTION EEl 7 8 biJ 9

lo Io Io I 10 12 13 I NA I lQJ 44 45 46 I Special Test Inspection 80 FOAM OF ACTIVITY CONTENT rn 7 8 RELEASED

~

9 OF RELEASE

~

10 11 AMOUNT OF ACTIVITY I.,______________ NA ~I 44 45 LOCATION OF RELEASE NA 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~I 0 1°1° 11I ~ NA 7 8 9 12 13 80 PERS"ONNEL INJURIES NUMBER DESCRIPTION EEi I 0 I0 I 0 I NA 7 8 9 11 12 80 PROBABLE CONSEQUENCES

~ I Continued degradation could result in inoperable CRDM (failure to drop).

7 8 9 80 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION 7

IIfil8 9L!J 10 NA 80 PUBLICITY EIZJ NA 7 8 9 80 ADDITIONAL FACTORS EJfil I (Cause Contd) replaced, the CRD ventilation will be improved, and an appropriate

• 7 8 9 80 EJfil I inspection and/ or test will be conducted at the next refueling outage. I 7 89 00

/ ..

-*r

,*~,!1