ENS 40788

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v t e ENS Event
16:45 Jun 3, 2004
Title	Part 21 Notification of Failure of Spring Charging Function in Circuit Breaker
Event Description	Limerick has completed the 10CFR Part 21 evaluation of the failure of the spring charging function on an Asea Brown Boveri (ABB) Model HK circuit breaker. The investigation determined that the primary contributor to the failure was the replacement of ABB latch reset torsion spring number 195205A00 with a weaker spring that was supplied with the breaker overhaul kit number 716656T104. Secondary contributors to the failure were normal wear on additional parts in the operating mechanism. ABB supplied a six-turn latch reset torsion spring and a five-turn latch reset torsion spring under spring part number 195205A00 and overhaul kit number 716656T104. The spring of concern is a six-turn spring that does not provide as much force as the original six-turn or five-turn spring. When informally tested during the investigation the six-turn spring provided approximately 66 ounces of force and the five-turn spring provided approximately 102 ounces of force. The original six-turn spring provided a force of 88 ounces. Limerick's evaluation concluded that installation of the replacement six-turn latch reset torsion spring could create a substantial safety hazard depending on the breaker's application. Therefore, this notification is being submitted pursuant to the requirements of 10CFR21.21(d)(3)(i). The required 10CFR21.21(d)(3)(ii) 30-day written notification will provide more detail when submitted. ABB evaluation of this issue is still in progress. The licensee notified the NRC Resident Inspector. * * RETRACTION ON 6/30/04 @ 1451 HRS. EDT FROM GAMBLE TO CROUCH * * * This is a retraction of the Part 21 initial notification made per 10CFR21.21(d)(3)(i) on 6/3/04 at 12:47 EDT (EN 40788). The issue involved an in-service malfunction of the closing spring charging function of an Asea Brown Boveri (ABB) Model HK circuit breaker following replacement of the latch reset torsion spring (ABB number 195205A00) during breaker maintenance. The spring was supplied with ABB overhaul kit number 716656T104. Upon further review of the Part 21 reporting requirements it has been determined that this issue does not require reporting. NUREG-1022 Rev.2 'Event Reporting Guidelines 10CFR50.72 and 50.73' provides guidance for Part 21 reporting in section 5.1.8. The NUREG section references a federal register notice (56 FR 36081, July 31, 1991) in footnote 18, which provided notification of an amendment to 10CFR Parts 21 and 50. The amendment was intended to reduce duplicate reporting of defects. The notice provides the following guidance for components that have been installed in operating plants: Operating license holders can reduce duplicate evaluation and reporting effort by evaluating deviations in basic components installed in operating plants which produce events which could meet the criteria of 50.72 and 50.73. If the evaluation of events using the criteria of 50.72 and 50.73 results in a finding that the event is reportable and the event is reported via these sections, then as indicated in 21.2(c), the evaluation, notification, recordkeeping, and reporting obligations of part 21 are met. If the event is determined not to be reportable under 50.72 or 50.73, then the obligations of part 21 are met by the evaluation. The evaluation using the criteria of 50.72 and 50.73 resulted in a finding that the event was not reportable. There was no reasonable expectation of preventing fulfillment of a safety function, no equipment was declared inoperable, and the principle safety barriers were not seriously degraded. Therefore, this event is not reportable using the criteria of 50.72 and 50.73 and the Part 21 evaluation obligation is met. The licensee has notified the NRC Resident Inspector of this retraction. The Headquarters Operations officer notified R1DO (Barkley), R2DO (Evans), R3DO (Gardner), R4DO (Whitten), and NRR (Dennig).

ENS 40788 +/- *RETRACTED*
Where
Limerick Pennsylvania (NRC Region 1)
Reporting

10 CFR 21.21
Time - Person (Reporting Time:+-3.97 h-0.165 days <br />-0.0236 weeks <br />-0.00544 months <br />)
Opened:	Stan Gamble 12:47 Jun 3, 2004
NRC Officer:	Arlon Costa
Last Updated:	Jun 30, 2004
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v • d • e

v t e Emergency Notification System
Limerick with 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation
WEEKMONTHYEAR2004-06-03T16:45:00 [Table view]
[ENS list for Limerick]

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