ML19249F249
| ML19249F249 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 09/26/1979 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Cavanaugh W ARKANSAS POWER & LIGHT CO. |
| References | |
| NUDOCS 7910110169 | |
| Download: ML19249F249 (1) | |
Text
CENTRAL FILES PDR:HQ sa arc UNITE D STATES E 7 3 c. (g g
. UCLEAR REGULATORY COMMISS:ON NSIC a g "V/, j REGION IV
- g 61: RYAN PLAZA DRIVE, SUITE 1000 S ?+ D
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ARLINGTON, TEX AS 76012
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September 26, 1979 Docket Nos.
50-313 50-368 Arkansas Power and Light Company ATTN:
Mr. William Cavanaugh III Vice President of Generation and Construction P. O. Box 551 Little Rock, Arkansas 72203 Centlemen:
The enclosed IE Information Notice provides information with regard to failures of lube oil coolers for emergency diesel generators.
Sincerely, f
. c e,!c'c u.-.
Karl V. Seyfrit Director
Enclosures:
1.
List of IE Information Notices Issued in the Last Six Months cc:
James P. O'Hanlon, Plant Manager Arkansas Nuclear One P. O. Box 608 Russellville, Arkansa,
- 728n, 1077 084 s
7910110 !
o
na jg ncg a r I
- = J Dbk Accession No:
7908220121 SSINS:
6870 UNITED STATES NUCLEAR REGULAIORY C0!LMISSION OFFICE OF INSPECTION AND ENFORCEtENT WASHINGTON, D.C.
20555 IE Information Notice No. 79-23 Date:
September 26, 1979 Page 1 of 1 EMERGENCY DIESEL GENERATOR LUBE OIL COOLERS Vithin a two week time span (August 27 to September 11, 1979), the tube sheets failed in the Arkansas Nuclear One (ANO) Unit 1 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 o; 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 thickaess 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 Di-
'on 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 It is expected that recipients will review the information for possible matter.
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.
1077 085