ML20137G112

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Part 21 Rept Re Separation of Piston from Connecting Rod on Cooper-Bessemer Reciprocating Div Ksv Engine.Initially Reported on 850304.Engine Returned,Rebuilt & Inspected.No Future Problems Foreseen
ML20137G112
Person / Time
Site: Susquehanna  Talen Energy icon.png
Issue date: 08/22/1985
From: Stolba F
COOPER BESSEMER CORP.
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
References
REF-PT21-85, REF-PT21-85-377-000 PT21-85-377, PT21-85-377-000, QCG-2077, NUDOCS 8508270179
Download: ML20137G112 (2)


Text

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F COOPER BESSE.*.iER RECIPROCATING F. Bruce Stolba

%ce Presg1ent and General Manager KJ4 _

August 22, 1985 QCG-2077 Office of Inspection and Enforcement U.S. NUCLEAR REGULATORY COMMISSION Washington D.C. 20555 ATTENTION: Director of Inspection and Enforcement Gentlemen:

In my letter of March 4,1985, ref. QCG-1077 I advised you of an incident in which a piston separated from a connecting rod in one of our KSV type engines. The engine had been packaged at the Rocky Mount, North Carolina facility of Power Systems, a Morrison Knudsen Dividon. The ultimate location of the engine will be in the Berwick, Pennsylvania Plant of the Pennsylvania Light and Power Company.

Our preliminary investigation indicated that the bolts (2) attaching the piston to the connecting rod were either loose or loosened leading to their failure. We also advised you that this appeared to be a unique failure.

In order to obtain the best possible independent evaluation of the circum-stances we retained the Westinghouse Research and Development Center in Pittsburgh, Pennsylvania. We have now received their final report entitled,

" Failure Analysis of the KSV-20T Diesel Piston Pin Bolts" by L. Albertin, Components Analysis, Nuclear Materials Department. Mr. Albertin's extensive report covers:

A. Visual Observations B. Fractorgraphic Examinations C. Metallography D. Non Destructive Examination of Remaining (unfractured) Bolts E. Chemistry of Grease and Oil Residues Collected from Bolts F. Hardness Checks G. And Other Miscellaneous Analyses 0500270179 090022 PDH ADOCK 03000307 S PDH Uno9n Awnue*

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l Page Two i August 22, 1985 l

The conclusion reached by Westinghouse confirms our original evaluation, and details the fact that one of the two bolts involved was loose. The bolt had "galded" which precluded proper tightening. As a direct result of this incident we have changed our assembly procedures to check the condition of this bolted assembly prior to final tightening of the two bol ts involved.

The engine was returned to our Grove City facility where it has been {

rebuilt and thoroughly inspected, the whole process being witnessed and recorded by both Power Systems and Pennsylvania Power and Light Company representatives. The engine is currently on test and we foresee no further problems.

Yours sincerely, bi T>ut SthWw F. Bruce Stolba Vice President and General Manager of C-8 Reciprocating Division cc: it. L. King, fianager, Purchasing, Power Systems Files: K-5f 50 0939 50 0828/P2/S1 N cooPIn DESsEMER n[CIPROCATING 2" "