ML19249F270
| ML19249F270 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 09/26/1979 |
| From: | Engelken R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | Goodwin C PORTLAND GENERAL ELECTRIC CO. |
| References | |
| NUDOCS 7910110192 | |
| Download: ML19249F270 (1) | |
Text
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,o UNITED STATES jp {
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. 8 REGION V 0, ((d 1990 N. CALIFORNIA BOULEVAMD
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WALNUT CREEK, LALIFORNI A 94596 September 26, 1979 Docket No. 50-344 Portlar.d General Electric Ccmpany 121 S. W. Salmon Street Portland, Oregon 97204 Attention: Mr. Charles Goodwin, Jr.
Assistant Vice President Gentlemen:
The enclosed Information Notice provides information with regard to failures of lube oil coolers for emergency diesel generators.
Sincerely,
' air R. H. I ngelken Director
Enclosures:
1.
List of IE Information Notices Issued in the Last Six Months cc w/ enclosures:
C. P. Yundt, PGE F. C. Gaidos, PGE 1077 194 7 91011om2
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Accession No:
7908220121 SSIUS:
6870 UNITED STATES NUCLEAR REGULATORY C0f01ISSION
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_ ID)__36" 0FFICE OF INSPECTION AND EllFORCEliENT
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WASHINGTON, D.C.
20555 September 26, 1979 IE Informatior Notice No. 79-23 EliERGENCY DIESEL GENERATOR LUBE Oli. COOLERS Within a two week time span (August 27 to September 11,1979), the tub; sheets failec in tne Arr. ansa 3.aclear One (ANC) Unic ' 'abe cil c0clers for bcth 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 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-eiqhth (1/8) inch in thickness and the tubes were soldered in place.
Ecoxy was also used as a sealer on the tube (water si ') of the lube oil cooler.
The new coolers have one-half (1/2) inch tube sheets ar.d 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 lobe oil coolers (Model Number D-191700) were manufactured by Young Radiator Corporation.
This information is provided as an early notification of a possible significant natter.
It is expected that recipients will review the information for possible applicabilit.y lo their facilities. No specific action or response is requested at this time.
If further NRC evaluations so indicate, an IE Circular or Bulletin will be issued to recommend or request specific licensee actions.
If you have questions regarding this matter, picase contact the Director of the appropriate NRC Regional Office.
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