ML19316B038
| ML19316B038 | |
| Person / Time | |
|---|---|
| Site: | Haddam Neck File:Connecticut Yankee Atomic Power Co icon.png |
| Issue date: | 05/13/1980 |
| From: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Counsil W CONNECTICUT YANKEE ATOMIC POWER CO. |
| References | |
| NUDOCS 8005280203 | |
| Download: ML19316B038 (1) | |
Text
r tri UNITED STATES 4f 3g" NUCLEAR REGULATORY COMMISSION g
3 REGloN I To j
$31 PARK AVENUE
- g g
KING OF PRUSSI A. PENNSYl.VANI A 19406 4.....
May 13, 1980 Dccket No. 50-213 Connecticut Yankee Atomic Power Company ATTN:
Mr. W. G. Counsil Vice President - Nucle &r Engineering and Operations P. O. Box 270 Hartford, Connecticut 06101 Gentlemen:
The 2nclosed IE Circular No. 80-11, " Emergency Diesel Generator Lube Oil Cooler Failures," is forwarded to you for information.
No written response is required.
If you desire additional information regarding this matter, please contact this office.
Sincerely,
- A _
Boyce H. Grier Director
Enclosures:
1.
IE Circular No. 80-11 2.
List of Recently Issued IE Circulars CONTACT:
W. H. Baunack l
(215-337-5253) l 1
cc w/encis:
R. Graves, Plant Superintendent D. G. Diedrick, Manager of Quality Assurance J. R. Himmelwright, Licensing Safeguards Engineer 8005280203
ENCLOSURE 1 SSINS No.: 6830 Accession No.:
UNITED STATES 8002280662 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT
]D 93 WASHINGTON, D.C. 20555 avcvj
- 3 cp IE Circular No. 80-11 Date
May 13, 1980 Page 1 of 1 EMERGENCY DIESEL GENERATOR LUBE OIL COOLER FAILURES Description of Circumstances:
Within a two week period (August 27 to September 11, 1979), the tube sheets failed in the lube oil coolers of both emergency diesel generators for Arkansas Nuclear One (ANO) Unit No. 1.
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.
These events were previously identified to all operating license and construction permit holders by Information Notice 79-23, Emergency Diesel Generator Lube Oil Cooler on September 25, 1979.
The emergency diesel generators involved were manufac-tured by the Electro-Motive Division (EMD) of the General Motors Corporation and the failures occurred on engines 71-Al-1117 and 71-Al-1130.
The failed lube oil coolers were manufactured by the Young Radiator Company.
An analysis of the failed coolers performed by EMD resulted in the conclusion that the failures were caused by severe corrosion of the solder which sealed the tubes to the tube sheets. The corrosion inhibitor in use at ANO was Calgon CS, a borate-nitrite type inhibitor. The manufacturer of this type of inhibitor has recommended the use of hard solder in CS treated systems.
EMD does not recommend the use of Calgon CS since the puddle solder used in EMD radiators and oil coolers is considered to be soft solder of a lead-tin composition.
Recommended Action for Licensees' Consideration:
Based on the above, it is recommended that P:censees:
1.
Verify that the corrosion inhibitor used in cooling water systems of the emergency diesel generators is compatible with all materials wetted by the cooling water and the engine manufacturer's specific recommendations.
Also, by means of the engine maintenance history, verify that the system corrosion inhibitor has been properly monitored and maintained at the recommended concentration.
I 2.
If Item 1 cannot be successfully performed, the affected components should be inspected in accordance with the manufacturer's recommendations.
No written response to this Circular is required.
t l
l If you desire additional information regarding this matter, contact the Director of the appropriate NRC Regional Office.
i
ENCLOSURE 2 IE Circular No. 80-11 Date:
May 13, 1980 Page 1 of 1 RECENTLY ISSUED IE CIRCULARS Circular Subject First Date Issued To No.
of Issue 79-25 Shock Arrestor Strut 1/31/80 All Power Reactor Facil-Supplement A Assembly Interference ities with an Operating License (OL) or Construc-tion Permit (CP) 80-01 Service Advice for GE 1/17/80 All Power Reactor Facil-Induction Disc Relays ities with an OL or CP 80-02 Nuclear Power Plant 2/1/80 All Power and Research Staff Work Hours Reactors with an OL or CP 80-03 Protection from Toxic 3/6/80 All Power Reactor Facil-Gas Hazards ities with an OL 80-04 Securing Threaded Lack-3/14/80 All Power Reactor Facil-ing Devices on Safety-ities with an OL or CP Related Equipment 80-05 Emergency Diesel Gen-4/1/80 All Power Reactor Facil-erator Lubricating Oil ities with an OL or CP Addition and Onsite Supply 80-06 Control and Account-4/14/80 Medical Licensees in ability Systems for Categories G and G1 Implant Therapy Sources 80-07 Problems
.th HPCI 4/3/80 all Power Reactor Facil-Turbine Oil System ities with an OL or CP 80-08 BWR Technical Speci-4/18/80 All General Electric fication Inconsis-BWRs holding a power tency - RPS Response reactor OL Time 80-09 Problems with Plant Internal 4/28/80 All holders of a Cc=munications Systems reactor OL or CP 80-10 Failure to Maintain Environmental All Power Reactor Qualification of Equipment Facilities wth an OL or CP i
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