ML19275A346
| ML19275A346 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 09/26/1979 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Groce R VERMONT YANKEE NUCLEAR POWER CORP. |
| References | |
| NUDOCS 7910040151 | |
| Download: ML19275A346 (4) | |
Text
Th d[d d8Gvf UNITED STATES 8?
< '/ $
NUCLEAR REGULATORY COMMISSION 59 5
REGION I 5.,[ UL!Ila e' !
G31 PARK AVENUE 3, A.
'd#
.<tNG OF PRUSSIA, PENNSYLVANI A 19406 Docket No. 50-271 SEP 2 61979 Vermont Yankee Nuclear Power Corporation ATTN:
Mr. Robert H. Groce Licensing Engineer 20 Turnpike Road Westborough, Massachusetts 01581 Gentlemen:
The enclosed Information Notice provides information with regard to failures of lube oil coolers for emergency diesel generators.
Sincerely, r-- -
Boyce H. Grier
' Director
Enclosures:
1.
IE Information Notice 79-23 2.
List of IE Information Notices Issued in the Last Six Months cc w/encls:
W. F. Conway, Plant Superintendent Ms. J. Abbry, Technical Secretary A. Z. Roisman, Natural Resources Defense Council
!100 083 7910040 d
?
ENCLOSURE 1 Accession No:
7908220121 SSINS:
6870 UNITED STATES NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT WASHINGT0h, D.C.
20555 IE Information Notice No. 79-23 Date:
September 26, 1979 Page 1 of 1 EMERGENCY DIESEL GENERATOR LUBE OIL COOLERS Within a twc 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 tne Unit 1 Emergency Diesel Generators.
The introduction of water loto 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 nas 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 0-191700) 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 possible applicability to their facilities.
No specific action or response is requested at this tima.
If further NRC eva'eations so indicate, an IE Circular or Bulletin will be issued to recommerd or reauest specific licensee actions.
If you have questions regarding this matter, piease contact the Director of the appropriate NRC Regional Office.
.1100 034