ENS 41888

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v t e ENS Event
22:00 Aug 2, 2005
Title	Potential Part 21 Issue with Struthers-Dunn Relays
Event Description	On 8/21/2005 Duke Energy Corporation was informed by the manufacturer of Struthers-Dunn relay, part number 219BBXP, of a manufacturing defect with the subject relay. Duke contacted the manufacturer as follow up to recent relay failures of this type. There has not been a Part 21 notification to date. The defect is in the relay coil. Some coils that were made in China over an approximate 18-month period did not have their coil core annealed. The annealing step in the manufacturing process was apparently skipped. The missed annealing step results in the relay coil potentially drawing almost twice its rated current. As a result, the coil can fail after an extended period of time in the energized state. Potentially affected relays of this type were purchased commercial grade and dedicated by Duke Energy Corporation for use in safety related applications. This relay type is utilized in valves in the Catawba Nuclear Service Water System. An investigation is in progress as to whether the relays in service at Catawba have the date code to indicate they have the manufacturing defect. Duke is also investigating if this relay type is in service at the other Duke nuclear units. This manufacturing defect may be reportable under 10 CFR 21 if other utilities purchased identical relays and dedicated them for use in safety related applications. The following is a summary of information obtained from Struthers-Dunn concerning the affected relays: (1) Relays manufactured between January 2003 and June 2004 (date codes 0301B through 0424B on the cover). (2) Any 219 series relay with 120 AC and 240 AC coils. (3) 'Made in China' marked on the cover. (4) Also 'Made in USA' marked on the cover with a 'B' in the date code could be affected. The Catawba NRC senior resident inspector has been notified. The relays used in the Catawba Nuclear Service Water System are normally energized. The licensee will be notifying the North Carolina and South Carolina Warning Points and York, Gaston and Mecklenburg County agencies.

ENS 41888 +/-
Where
Catawba South Carolina (NRC Region 2)
Reporting

Other Unspec Reqmnt
Time - Person (Reporting Time:+-0.28 h-0.0117 days <br />-0.00167 weeks <br />-3.83544e-4 months <br />)
Opened:	David Johnson 21:43 Aug 2, 2005
NRC Officer:	Jeff Rotton
Last Updated:	Aug 2, 2005
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v • d • e

v t e Emergency Notification System
Catawba with Other Unspec Reqmnt
WEEKMONTHYEAR2009-06-18T15:15:00 [Table view]
[ENS list for Catawba]

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