ML19316A878
| ML19316A878 | |
| Person / Time | |
|---|---|
| Site: | Callaway  |
| Issue date: | 05/13/1980 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Bryan J UNION ELECTRIC CO. |
| References | |
| NUDOCS 8005280017 | |
| Download: ML19316A878 (1) | |
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8[s-NUCLEAR REGULATORY COMMISSION hk Io, UNITED STATES
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WAY 13 G80 Docket No. 50-483 Docket No. 50-486 Union Electric Con.pany ATTN:
Mr. John K. Bryan Vice President - Nuclear P. O. Box 149 St. Louis, MO 63166 Gentlemen:
The enclosed IE Circular No. 80-11 is forwarded to you for informa-tion. No written response is required. Should you have any questions related to your understanding of the recommendations on this matter, please contact this office.
Sincerely, c
L) a.D n gJamesG.Keppler Director
Enclosure:
IE Circular No. 80-11 cc w/ encl:
Mr. W. H. Weber, Manager, Ne. lear Construction Ceatral Files Director, NRR/DPM Director, NRR/ DOR PDR Local PDR NSIC TIC Region I & IV Ms. K. Drey Mr. Ronald Fluegge, Utility Division, Missouri Public Service Commission 800528 cot 7
SSINS No.: 6830 e'
Accession No.:
UNITED STATES 8002280662-NUCLEAR REGULATORY COMMISSION 3~r 0 q
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OFFICE OF INSPECTION AND ENFORCEMENT WASHINGTON, D.C. 20555 3&
aJ May 13, 1980 IE Circular No. 80-11 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 (AN0) 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 licensees:
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.
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.
If you desire additional information regarding this matter, contact the Director of the appropriate NRC Regional Office.
IE Circular No.' 80-11 Enclosure e'
May 13, 1980 RECENTLY ISSUED IE CIRCULARS Circular Subject Date of Issued to No.
Issue 80-10 Failure to Maintain 4/29/80 All holders of Reactor Environmental Qualification OLs and cps of Equipment 30-09 Problems With Plant Internal 4/28/80 All holders of a power Communications Systems reactor OL or CP 80-08 BWR Technical Specification 4/18/80 All General Electric Inconsistency - RPS Response BWR's holding a power Time reactor OL 80-07 Problems with HPCI Turbine 4/3/80 All holders of a power Oil System reactor OL or CP 80-06 Control and Accountability 4/14/80 Medical licensees in Systems for Implant Therapy Categories G and G1 Sources 80-05 Emergency Diesel-Generator 4/1/80 All holders of a power Lubricating Oil Addition and reactor OL or CP Onsite Supply 80-04 Securing of Threaded Locking 3/14/80 All holders of a power Devices on Safety-Related reactor OL or CP l
Equipment 80-03 Protection from Toxic Gas 3/6/80 All holders of a Hazards power reactor OL j
80-02 Nucle;;~ Power Plant Staff 2/1/80 All holders of Reactor Work : burs Ols, including research and test reactors, and i
cps 80-01 Service Advice for GE 1/17/80 All licensees of Induction Disc Relays nuclear power reactor operating facilities and holders of nuclear power reactor cps
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