ML19316A923
| ML19316A923 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 05/13/1980 |
| From: | Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| To: | Millen C PUBLIC SERVICE CO. OF COLORADO |
| References | |
| NUDOCS 8005280061 | |
| Download: ML19316A923 (1) | |
Text
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NUCLEAR REGULATORY COMMISSION LPDR fa y%
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,j ARLINGTON, TEXAS 76012 STATE May 13, 1980 Docket No. 50-267 Public Service Company of Colorado ATTN:
Mr. C. K. Millen Senior Vice President P. O. Box 840 Denver, Colorado 80201 Gentlemen:
The enclosed IE Circular No. 80-11 is forwarded to you for information.
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, f
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Karl V. Seyfrit Director l} '
Enclosures:
1.
IE Circular No. 80-11 2.
List of Recently Issued IE Circulars cc:
D. W. Warembourg, Nuclear Production Manager Fort St. Vrain Nuclear Station P. O. Box 368 Platteville, Colorado 80651 L. Brey, Manager, Quality Assurance 800528006/
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1 SSINS No.: 6830 Accession No.:
UNITED STATES 8002280662 NUCLEAR REGULATORY COMMISSION OFFICE OF INSPECTION AND ENFORCEMENT O l 01 N
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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 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 I 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 May 13, 1980 RECENTLY ISSUED IE CIRCULARS Circular Subject Date Issued To No.
Issued 80-04 Securing of Threaded 3/14/80 All holders of a power Locking Devices on Safety-reactor Operating License Related Equipment (OL) or Construction Permit (CP) 80-05 Emergency Diesel-Generator 4/1/80 All holders of a power Lubricating Oil Addition reactor Operating License (OL) and Onsite Supply or Construction Permit (CP) 80-06 Control and Accountability 4/14/80 Medical licensees in Systems for Implant Categories G and G1 Therapy Sources 80-07 Problems with HPCI Turbine 4/3/80 All holders of a power Reactor Operating Licenses (OL) or Construction Permit (CP) 80-08 BWR Technical Specifi-4/18/80 All General Electric BWR's cation Inconsistency -
holding a power reactor RPS Response Time Operating License (OL) 80-09 Problems With Plant 4/28/80 All holders of a power Internal Communications reactor Operating License (OL)
Systems or Construction Permit (CP) 80-10 Failure to Maintain 4/29/80 All holders of Reactor Environmental Qualifi-Operating Licenses (OLs) cation of Equipment and Construction Permits (cps)
Enclosure