ML19249F267
| ML19249F267 | |
| Person / Time | |
|---|---|
| Site: | Humboldt Bay, Diablo Canyon |
| Issue date: | 09/26/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Crane P PACIFIC GAS & ELECTRIC CO. |
| References | |
| NUDOCS 7910110190 | |
| Download: ML19249F267 (1) | |
Text
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o UNITED STATES a
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NUCLEAR REGULATORY COMMISSION hp
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REGION V
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1990 N. CALIFOHNIA t10ULEVARD o'A
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WA.. NUT CRE E K, CALIFORNI A 94505 September 26, 1979 Docket Nos. 50-133 50-275 50-323 Pacific Gas and Electric Company 77 Beale Street San Francisco, California 94106 Attention:
Mr. Philip A. Crane, Jr.
Assistant General Counsel Gentlemen:
The enclosed Information Notice provides information with regard to failures of lube oil coolers for emergency diesel generators.
Sincerely, a&WAu
[ R. H. En(elken Director
Enclosures:
1.
List of IE Information Notices Issued in the Last Six Months cc w/ enclosures:
W. Barr, PG&E W. Raymond, PG&E R. Ramsay, PG&E, Diablo Canyon E. Weeks, PG&E, Humboldt Bay J. Worthington, PG&E 1077 183 7910110/90
Accession No:
7908220121 SSINS:
6870 UNITED STATES D
CM 0FFICE OF INSPECTION AND ENFORCEMEllT hhg NUCLEAR REGULATORY CCW11SSION U W)
WASHINGTON, D.C.
20555 September 26, 1979 IE Information Notice No. 79-23 EMERGENCY DIESEL GENERATOR LUBE OIL COOLERS Within a two week time scan (August 27 to September 11,1979), the tube sheets failee in Ine Arkansas Nuclear Gne TANG) Unit i luce oil coolers for both of the Unit 1 Emergency 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 made 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 sheett which were one-efahth (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. il 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 rianufactured 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 possible a;,plicability to their facilities. No specific action or response is requested
.it this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recomend or request specific licensee actions.
If you have questions regarding this matter, please contact the Director of the appropriate NRC Regional Office.
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