ML080430446

Notification of Potential Part 21 Report Power Supply Unit Is Limited at Elevated Temperatures

ML080430446
Person / Time
Site:	Dresden, Peach Bottom, Browns Ferry, Quad Cities
Issue date:	02/11/2008
From:	Hinson L Nutherm International
To:	Office of Nuclear Reactor Regulation
References
43973
Download: ML080430446 (3)

Text

0210912008 U.S. Nuclear Regulatory Commission Operations Center Event Report Page I General Information or Other (PAR)

Event#

43973 Rep Org: NUTHERM INTERNATIONAL, INC Notification Date / Time: 02/09/2008 09:11 (EST)

Supplier: NUTHERM INTERNATIONAL, INC Event Date / Time: 02/09/2008 (CST)

Last Modification: 02/09/2008 Region:

3 Docket #:

City:

MT VERNON Agreement State: Yes County:

License #:

State:

IL NRC Notified by: LEONARD HINSON Notifications:

THOMAS KOZAK R3 HQ Ops Officer: JOHN KNOKE JOEL MUNDAY R2 Emergency Class: NON EMERGENCY CHRISTOPHER CAHILL R1 10 CFR Section:

PART 21 GROUP 21.21 UNSPECIFIED PARAGRAPH PART 21 NOTIFICATION - POWER SUPPLY UNIT IS LIMITED AT ELEVATED TEMPERATURES "In accordance with 1 OCFR Part 21, Nutherm International, Inc. has opened an evaluation for a potential reportable condition.

"Based on testing results of a production unit of a Nutherm Power Supply, part number 55320, the unit may not perform at elevated temperatures (at or above 120 'F) at its rated nameplate output rating of 20 Amps indefinitely.

Preliminary reviews indicate that at ambient air temperatures of 120 'F or greater, the rectifier employed in the design may be limited to output currents of 15 Amps or less.

"There have been no reports from customers concerning failures of these units as a direct result of this issue. If a reportable condition exists TVA (Browns Ferry) and Exelon (Quad Cities, Dresden, Peach Bottom) will be contacted."

Received,at: 02/11/2008 09:08 "02/11/2008 MON 8:15 FAX 6182446641 Nutherm International I001/002 F ax

.iNERNATIAL, INC 501 SOUTH ELEVENTH STREET MT. VERNON, ILLINOIS 62864 PHONE 618-244-6000 FAX618-244-6641 To: NRC Operations Center From: Leonard Hinson Fax:

301-816-5151 Pages including Cover. 2 Phone:

_"_Date:

February 11, 2008 CC:

Nutherm Project No: N/A Customer Project No:

N/A

Subject:

Potential 10 CFR Part 21 Reportable Condition for Nutherm International, Inc.

The attached letter was sent on Saturday February 9, 2008 with an incorrect date on that letter. I am resending the letter for your files with the error corrected.

If you have any questions on the above, call me at 618-244-6000 extension 3008 or Adrienne Smith at exx.. ion 3034.

Leonard Hinson President

02/11/2008 MON 8:16 FAX 6182446641 Nutherm International a002/002 Nuthermj IWTERNATIONAL, INO.

501 SOUTH ELEVENTH STREET MT. VERNON, ILLINOIS 62864 PHONE 618-244-6000 FAX 618-244-6641 February 09,2008 U.S. Nuclear Regulatory Commission Document Control Desk Washington, DC 20555-0001

Subject:

Potential 1 OCFR Part 21 Reportable Condition for Nutherm International, Inc, (Amended Date)

Dear Sirs:

I This letter is to inform you that, in accordance with 10CFR Part 21, Nutherm International, Inc. has opened an evaluation for a potential reportable condition.

Based on testing results of a production unit of a Nutherm Power Supply, part number 55320, the unit may not perform at elevated temperatures (at or above 120 'F) at its rated nameplate output rating of 20 Amps indefinitely. Preliminary reviews indicate that at ambient air temperatures of 120 'F or greater, the rectifier employed in the design may be limited to output currents of 15 Amps or less.

There have been no reports from customers concerning failures of these units as a direct result of this issue.

If a reportable condition exists TVA (Browns Ferry) and Exelon (Quad Cities, Dresden, Peach Bottom) will be contacted.

Sincerely, NUTHERM INTERNATIONAL, Inc.

Leonard Hinson President LH/abs