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

.* .. * .... LICENSEE EVENT REPORT CONTROL BLOCK: i...1 __,___._IL--.L.I

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__.I [PLEASE PRINT ALL REQUIRED INFORMATION]

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• LICENSEE NAME IM I I Ip I Al LI 1 I 7 8 9 14 LICENSE NUMBER I ol ol-lo I ol ol olo 1-1 ol ol 15 25 REPORT REPORT LICENSE TYPE 14111111111 26 30 EVENT DATE EVENT TYPE lo Ii I 31 32 REPORT DATE TYPE SOURCE @ill CON'T I..__......__..

L1:J l1J OOCKl;T NUMBER I o I 51 ol-1 o I 2 I 5 I 51 lol31ol417161 1013101211161 7 8 57 58 59 60 61 BB 69 74 75 80 EVENT DESCRIPTION lol 2 1 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 7 89 00 lolsl 7 8 9 SYSTEM CODE @:0 IRI Bl 7 8 9 10 CAUSE CODE 11 CAUSE DESCRIPTION COMPONENT CODE le IR I D I R I v I El 12 17 PRIME COMPONENT SUPPLIER l.!..J 43 COMPONENT MANUFACTURER IC I 419 I 0 I 44 47 VIOLATKJN L!J 48 lol0I I Bearing degradation appears to be the result of <,:>verheating.

Rod 7 8 9 80 drop time measure] 80 I ments have been.

specification limits during required_

tests. Although not 1-7 8 9 *[I@] I timed during the last shutdown, all rods dropped into the core. All bearings 7 8 9 FACILITY METHOD OF STATUS EEl biJ 7 8 9 % POWER lo Io Io I 10 12 CONTENT OF RELEASE OTHER STATUS I NA I 13 44 FOAM OF ACTIVITY RELEASED rn AMOUNT OF ACTIVITY I NA I.,__ ____________ 7 8 9 PERSONNEL NUMBER 0 1 °1° I 7 8 9 11 10 11 EXPOSURES TYPE DESCRIPTION 12 13 PERS"ONNEL INJURIES NUMBER DESCRIPTION 44 DISCOVERY lQJ I 45 46 45 NA EEi I 0 I 0 I 0 I NA 7 8 9 11 12 DISCOVERY DESCRIPTION Special Test Inspection LOCATION OF RELEASE NA PROBABLE CONSEQUENCES I Continued degradation could result in inoperable CRDM (failure to drop). 7 8 9 LOSS OR DAMAGE TO FACILITY TYPE DESCRIPTION IIfil L!J NA 7 8 9 10 PUBLICITY EIZJ NA 7 8 9 80 were I 80 80 80 80 80 80 80 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 / ..

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