ENS 43973

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v t e ENS Event
06:00 Feb 9, 2008
Title	Part 21 Notification - Power Supply Unit Is Limited at Elevated Temperatures
Event Description	{{#Wiki_filter: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. * * RETRACTED ON 04/09/2008 AT 1835 EDT BY LEONARD HINSON TO FANGIE JONES * * * The reporting organization provided the following information via facsimile: Nutherm has completed its investigation and concluded that all units supplied to customers meet the requirements of the Nutherm environmental qualification reports. Review of the qualification reports for these units indicates that the units were to operate at a maximum of 15.1 Amperes at temperatures up to 120�F. Some of the qualification reports also require that the units operate up to 15.1 Amperes at 160�F for 15 minutes. The results of our investigation indicate that the units supplied will meet the operating and accident requirements as stated in the qualification reports. Based on the results of this investigation, Nutherm International, Inc. has concluded that a reportable condition does not exist. Notified R1DO (Richard Conte), R2DO (Randy Musser), R3DO (Anne Marie Stone), NRR Part 21 Group ( by email: Vern Hodge and John Thorp), and NRO (Omid Tabatabai). }}

ENS 43973 +/- *RETRACTED*
Where
Nutherm International, Inc Mt Vernon, Illinois (NRC Region 3)
Organization:	Nutherm International, Inc
Reporting

10 CFR 21.21
Time - Person (Reporting Time:+3.18 h0.133 days <br />0.0189 weeks <br />0.00436 months <br />)
Opened:	Leonard Hinson 09:11 Feb 9, 2008
NRC Officer:	John Knoke
Last Updated:	Apr 9, 2008
43973 - NRC Website
v • d • e

v t e Emergency Notification System
Nutherm International, Inc with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation
WEEKMONTHYEAR2008-02-09T06:00:00 [Table view]
[ENS list for Nutherm International, Inc]

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ENS Notification