ML19249F274
| ML19249F274 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 09/26/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Mattimoe J SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| References | |
| NUDOCS 7910110197 | |
| Download: ML19249F274 (1) | |
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UNITED STATES
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SUITE 202, WALNUT CRE E K PL AZA e,,,e WALNUT CRE EK, CAllFORNI A 94596 September 26, 1979 Docket No. 50-312 Sacramento Municipal Utility District P. O. Box 15830 Sacramento, California 95813 Attention: Mr. John J. Mattimoe Assistant General Managar Gentlemen:
The enclosed Information Notice provides information with regard to failures of lube oil coolers for emergency diesel generators.
Sincerely,
'W f A. H. E'gelken R
Director
Enclosures:
1.
Information fictice 79-23 2.
List of IE Information Notices Issued in the Last Six Months cc w/ enclosures:
R. J. Rodriguez, SMUD L. G. Schwieger, SMUD 1077 213 7910110/f7
Accession l'o:
7908220121
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SSINS: 6870 (n j? C P UNITED STATES r
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fiUCLEAR REGULATORY COMMISSION 0FFICE OF IfiSPECTION AND Ef;FORCEMENT WASHIfiGTON, D.C.
20555 September 26, 1979 IE Information Notice flo. 79-23 EMERGENCY DIESEL GENERATOR LUBE OIL COOLERS Within a two weak timo snan (Auoust 27 to Sentember 11,1979), the tube sheets tailed in tne Arkansas r,uclear One (ANO) unit 1 luce oil coolers for both of the Unit 1 Emercency Diesel Generators.
The introduction of water into the diesel lube oil system resulted in trips of both diesels during surveillance testing.
The diesels were not considered capable of sustained operation.
Investigation by the licensee has indicated cracks around the outer periphery of the tube sheets.
The exact failure mode has not been assessed; however, the licensee has replaced the Emergency Diesel lube oil coolers for both diesels with a cooler of different design. The original lube oil coolers had tube sheets which were one-eighth (1/8) inch in thickness and the tubes were soldered in place.
Epoxy was also used as a sealer on the tube (water side) of the lube oil cooler.
The new coolers have one-half (1/2) inch tube sheets and the tubes are rolled.
The ANO, Unit 1 Emergency Diesel Generators were purchased in 1970 and were manufactured by the Electromotive Division of General Motors Corporation. The lube oil coolers (Model Number D-191700) were manufactured by Young Radiator Corporation.
This information is provided as an early notification of a possible significant matter.
It is expected that recipients will review the information for posible applicability to their facilities.
No specific action or response is rrquested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recomend or rec,uest specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate f!RC Regional Office.
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