ML19275A339
| ML19275A339 | |
| Person / Time | |
|---|---|
| Site: | Limerick  |
| Issue date: | 09/26/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Boyer V PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| References | |
| NUDOCS 7910040140 | |
| Download: ML19275A339 (4) | |
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UNITED STATES
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8 [', #, I,j NUCLEAR REGULATORY COMMISSION 3 g)'"
REGION I
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Docket tios. 50-352 SFP 2 e m3 50-353
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Philadelphia Electric Company Attention: fir. V. S. Boyer Vice President Engineering and Research 2301 Market Street Philadelphia, Pennsylvania 19101 Gentlemen:
The enclosed Information flotice provides information with regard to failures of li be oil coolers for emergency diesel generators.
Sincerely, A
Boyce H. Grier Director
Enclosures:
1.
IE Information flotice 79-23 2.
List of IE Information flotices Issued in the Last Six t'onths
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7910040j (j
ENCLOSURE 1 Accession No:
7908220121 SSINS:
6870 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C.
20555 2c Information Notice No. 79-23 Date:
September 26, 1979 Page 1 of 1 EMERGENCY DIESEL GENERATOR LUBE OIL COOLERS Within a two week time span (August 27 to September 11, 1979), the tube sheets failed in the Arkansas Nuclear One (ANO) Unit I lube 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 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 infctmation is provided as an early notification of a possible significant matter.
It is e;xpected that recipients will review the information for possible applicability to 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, please contact the Director of the appropriate NRC Regional Office.
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