ENS 41761

v t e ENS Event
04:00 Jun 7, 2005
Title	Part 21 Report Involving a Potential for Premature Failure of Control Rod Instrumentation Power Supply
Event Description	Ametek Solid State Controls produces AC-DC power supplies that are used at several nuclear power plants. Ametek states that its Series AC-DC power supplies may have a problem with premature failure. The specific Model Numbers affected are as follows: 85-RP1510-00 85-RP4804-00 85-RP4808-00 85-RP DUAL-4807\1 Ametek states that an intermittent loss of continuity in a magnet wire connector may cause overheating in a lug and transformer which could eventually result in a premature failure of the power supply ( within approximately two years of initial service). The problem was discovered during testing of a power supplies by Ametek. No nuclear power plants have reported any problems with the power supplies. Ametek states that its records indicate that these power supplies were supplied to Braidwood, Byron, and DC Cook. Ametek believes that the power supplies are used for control rod instrumentation. A total of 33 power supplies have been sold but Ametek believes that most of these are not in service. Ametek recommends that these power supplies either be returned to Ametek for rework or that the affected sites request a service by an Ametek representative onsite.

ENS 41761 +/-
Where
Ametek Solid State Controls Columbus, Ohio (NRC Region 3)
Organization:	Ametek Solid State Controls
Reporting

10 CFR 21.21
Time - Person (Reporting Time:+77.12 h3.213 days <br />0.459 weeks <br />0.106 months <br />)
Opened:	Bob George 09:07 Jun 10, 2005
NRC Officer:	Bill Huffman
Last Updated:	Jun 10, 2005
41761 - NRC Website
v • d • e

v t e Emergency Notification System
Ametek Solid State Controls with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation
WEEKMONTHYEAR2005-06-07T04:00:00 [Table view]
[ENS list for Ametek Solid State Controls]

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