ENS 44896: Difference between revisions
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| event date = 03/11/2009 EDT | | event date = 03/11/2009 EDT | ||
| last update date = 03/16/2009 | | last update date = 03/16/2009 | ||
| title = Part 21 Notification - Defective Hk | | title = Part 21 Notification - Defective Hk and K-Line Circuit Breaker Tension Springs | ||
| event text = The identification of the subject component is as follows: ABB P/N 716359A00 Tension Spring. These springs are used in both HK (Medium Voltage) and K-Line (Low voltage) circuit breakers. In the HK breaker, the spring is used on the racking mechanism to position the racking mechanism interlocking latch. In the K-Line circuit breaker, the spring resets the prop latch mechanism following a circuit breaker trip. Circuit breakers and spare parts procured from ABB between 04/23/2008 and 02/27/2009 may have suspect springs installed. | | event text = The identification of the subject component is as follows: ABB P/N 716359A00 Tension Spring. These springs are used in both HK (Medium Voltage) and K-Line (Low voltage) circuit breakers. In the HK breaker, the spring is used on the racking mechanism to position the racking mechanism interlocking latch. In the K-Line circuit breaker, the spring resets the prop latch mechanism following a circuit breaker trip. Circuit breakers and spare parts procured from ABB between 04/23/2008 and 02/27/2009 may have suspect springs installed. | ||
Nature of the deviation: Micro-cracks in the base of the hooked end of the springs may result in failure of the springs after repetitive cycles. A broken spring could potentially affect the ability of a K-Line or HK breaker to reset and close after an opening operation. Initial report of the nonconformance was generated on 02/11/2009 (NCR #68999JL), reporting that springs failed during mechanical life testing being performed on a K-Line breaker. These springs failed after approximately 2,800 cycles each. | Nature of the deviation: Micro-cracks in the base of the hooked end of the springs may result in failure of the springs after repetitive cycles. A broken spring could potentially affect the ability of a K-Line or HK breaker to reset and close after an opening operation. Initial report of the nonconformance was generated on 02/11/2009 (NCR #68999JL), reporting that springs failed during mechanical life testing being performed on a K-Line breaker. These springs failed after approximately 2,800 cycles each. | ||
Latest revision as of 22:12, 1 March 2018
| Where | |
|---|---|
| Abb Inc. Florence, South Carolina (NRC Region 1) | |
| Organization: | Abb Inc. |
| Reporting | |
| 10 CFR 21.21 | |
| Time - Person (Reporting Time:+11.87 h0.495 days <br />0.0707 weeks <br />0.0163 months <br />) | |
| Opened: | Terry Malloy 15:52 Mar 11, 2009 |
| NRC Officer: | Dan Livermore |
| Last Updated: | Mar 16, 2009 |
| 44896 - NRC Website | |