ML20012C105

Part 21 Rept Re Several Failures of Fairbanks Morse Engine Div Piston Pins/Bushings on Upper Pistons.Caused by Incorrect Surface Pattern on Piston Pins.Piston Pins Under Listed Purchase Orders to Be Removed & Replaced

ML20012C105
Person / Time
Site:	Calvert Cliffs, Arkansas Nuclear, Three Mile Island, Prairie Island, North Anna, Crystal River, Farley
Issue date:	03/07/1990
From:	Reder T COLT INDUSTRIES, INC.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-90, REF-PT21-90-039-000 PT21-90-039-000, PT21-90-39, NUDOCS 9003200100
Download: ML20012C105 (3)

Text

_

Colt industries F.irb.nks more.

Engine Divi lon

.i . 701 Lawton Avenue Beloit, Wisconsin 53511 Thomas J. Reder Vice President seies "

March 7, 1990 none 8173 Fax: 608/364 0382 Telex: 260007 COLTFMoFF BELT Office of Inspection & Enforcement .

U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glenn Ellyn IL 60137 Attention: Director of Region III

Subject:

Part 21 Notification for Fairbanks Morse Engine Division Model 38TD8-1/8 Piston Pin (Symbol 16200274)

Dear Sir:

During wear in of two commercial power units at Bay City, Michigan, starting on October 21 and ending on December 4, 1989, there were several failures of piston pins / bushings on the upper pistons. These engines are 900 rpm turbocharged units. Subsequently, a thorough investigation into the cause of failure resulted in finding that the root cause was the surface pattern on the piston pins. Our piston pin supplier had changed the honing process on the piston pins, creating a crosshatched finish that was within surface finish specifications, but did not provide the correct surface-pattern.

Under the right conditions, this crosshatched pattern can cause the pins to stop rotating, resulting in bushing failure. This condition only occurs on upper piston assemblies in 900 rpm turbocharged 0.P. engines. The lower piston assemblies are not affected by this condition.

We have furnished pins from August 1986 to present that are suspect. A list of sites to whom we have sold spare / replacement parts is enclosed. They are being notified-of the potential problem by copy of this letter.

Fairbanks Morse recommends the following actions be taken by the utilities:

1. Remove from stock piston pins furnished on the referenced purchase orders (enclosed) and return them to F.M. for inspection and replacement as necessary. Contact Ted Stevenson, phone 608/364-8424, to arrange for return and replacement.

2. Should any of .the pins furnished have been installed in an upper piston assembly, these pins should be replaced at your earliest opportunity.- Contact F.M. Product Service's Tom Stull, phone 608/364-8161, to arrange for inspection at the site. We will inspect the pins and provide replacements as necessary.

VM1121990 9003200100 900307 PDR S

ADOCK 05000282

. PDC

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b) g a aivmon or cannou,m., inc

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March 7, 1990 o .-U:S. Nuclear Regulatory Commission .

LPage Two A timely response from each utility is necessary to keep the EDG's in proper-readiness for use. Continued - operation with pins that do not rotate can lead to failure of upper piston / liner assembly.

Very truly y rs, T .eder ce Presi'ent ales & Marketing TJR/im Enclosure-cc: Director-Office of_ Inspection & Enforcement U.S. Nuclear Regulatory Commission .

Washington, DC 20555 l

I

PISTON ASSEfBLIES AND PISTON PINS SHIPPED TO NUCLEAR POWER PLANTS , ,,

Year- Service Customer

• Part Number Utility Plant Shipped Order #- Qty P.O.# ',

16203274 - Pin Arkansas P & L Arkansas Nuclear #1 1987 728893 18 05216 16608300 - Piston Assy. " "

Unit #2 "

729454 6 08132 (Includes pin) "

728893 1 05216 16608301 - Piston Assy. " " "

728893 1 05216 (Includes pin) 728893 8 07940 16200274 - Pin General Public Utilities Three Mile Island #1 1987 729258 6 TP-052434 16606468 - Piston Assy " " " "

1987 729063 12 TP-050092 (Includes Pin) 16200274 - Pin Northern States Power Co. Prairie Island No. I 1986 728634 8 E12577MQ 16200274 - Pin Virginia Elec. & Power Co. North Anna 1 & 2 1987 729694 10 SNS 155960 16200274 - Pin " " "

1988 729832 26 SNS 165489 16606467 - Piston Assy " " " " "

1986 727957 24 NS-14948 (Includes Pin).

16606468 - Piston Assy " " " " " "

1987 729045 11 NS 34646 (Includes Pin) 16606467 - Piston Assy Baltimore Gas & Elec Calvert Cliffs 1 & 2 1986 728794 12 90058-EX (Includes Pin) 1986 728783 12 90043-EX s s 16608301 - Piston Assy Alabama Power Co. J.M. Farley Plant 182 1987 728992 2 QP 1335 (Includes Pin) 16609598 - Piston Assy Florida Power Co. Crystal River #3 1989 729995 24 F800018D (Includes Pin) 16609599 - Piston Assy " " " " ~" "

1989 729995 24 F800018D (Includes Pin) w - -_ . - - . -

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