05000311/LER-1980-031-03, /03L-0:on 801230,coupling Connecting Two Camshaft Sections on Diesel Generator 2B Had All Bolts Sheared. Probably Caused by Improper Joint Tightening During Initial Assembly.Camshaft Sections Will Be Replaced

/03L-0:on 801230,coupling Connecting Two Camshaft Sections on Diesel Generator 2B Had All Bolts Sheared. Probably Caused by Improper Joint Tightening During Initial Assembly.Camshaft Sections Will Be Replaced

ML20003A926
Person / Time
Site:	Salem
Issue date:	01/29/1981
From:	Steele W Public Service Enterprise Group
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18085A779	List: 05000311/LER-1980-031, Forwards LER 80-031/03L-0 05000311/LER-1980-031-03, /03L-0:on 801230,coupling Connecting Two Camshaft Sections on Diesel Generator 2B Had All Bolts Sheared. Probably Caused by Improper Joint Tightening During Initial Assembly.Camshaft Sections Will Be Replaced
References
LER-80-031-03L, NUDOCS 8102100078
Download: ML20003A926 (2)

LER-1980-031, /03L-0:on 801230,coupling Connecting Two Camshaft Sections on Diesel Generator 2B Had All Bolts Sheared. Probably Caused by Improper Joint Tightening During Initial Assembly.Camshaft Sections Will Be Replaced

Event date:
Report date:
3111980031R03 - NRC Website

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l While perforninc routine surveillance on #2B Diesel Generator, it was i

o g, discovered that the coupling connecting two sections of the camshaft had E I all eicht of its attachina tolts sheared.

Since this ecuiment failure i

E [ was discovered with the olant in the Cold Shutdovn rode of ooeration, thisl g ievent must be recorted as if the olant had been eneratina in a dearaded i

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g i nspection of the coupling revealed that one of the nuts was not attached,

I i o its tolt. This would indicate that the joint may not have been properly t

tightened during initial assert ly. Two new camshaft sections with their,

i iattaching bolts and nuts have been ordered. Repairs are expectoi to be g

g i ccr:pleted on January 26, 1981.

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l R2 port Number:

80-31/03L Raport Date:

1/29/81 Occurrence Date:

12/30/80 Facility:

Salem Generating Station, Unit 2 Public Service Electric and Gas Company Hancocks Bridge, NJ 08038 i

IDENTIFICATION OF OCCURRENCE:

Diesel Camshaft Failure CONDITION PRIOR TO OCCURRENCE:

Mode 5 Cold Shutdown DESCRIPTION OF OCCURRENCE:

While performing routine surveillance on No. 2B Diesel Generator IAW Surveillance Requirement 4.8.1.1.2b, it was discovered that the coupling that connects two sections of the camshaft ha' all eight of its attaching bolts sheared.

Since this equipment failure was detected after the plant was shutdown, this failure must be reported as if the plant had been operating in a degraded mode in accordance with Technical Specification 6.9.1.9b.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Inspection of the coupling revealed that one of the nuts was not attached to its bolt.

This would indicate that the joint may not have been properly tightened during initial assembly.

No other damage to the other journals was noticeable.

ANALYSIS OF OCURRENCE:

With this Diesel Generator out of service, the remaining two.conprise the minimum number required to meet the limiting condition for operation in Mode 5 IAW Technical Specification 3.8.1.2.

CORRECTIVE ACTION

Two new camshaft sections with their attaching nuts and bolts have been ordered.

Repairs are expected to be completed on January 26, 1981.

FAILURE DATA:

ALCO Engine Part #21610135, Cam Section, Free End, Cylinder 1.

Part #21610136, Cam Section, Intermediate, Cylinders 2 and 3.

Part #2151682, Special Str.d Bolt Prepared By W.

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