ENS 44708: Difference between revisions
Jump to navigation
Jump to search
StriderTol (talk | contribs) (Created page by program invented by Mark Hawes) |
StriderTol (talk | contribs) (Created page by program invented by StriderTol) |
||
| Line 16: | Line 16: | ||
| event date = 11/16/2008 18:27 EST | | event date = 11/16/2008 18:27 EST | ||
| last update date = 12/10/2008 | | last update date = 12/10/2008 | ||
| title = Invalid Actuation | | title = Invalid Actuation of an Emergency Diesel Generator | ||
| event text = This notification of a system actuation is provided in accordance with 10 CFR 50.73(a)(2)(iv)(A). The Licensee is providing a telephone notification to the NRC Operations Center in accordance with 10 CFR 50.73(a)(1) instead of submitting a written Licensee Event Report, as the system actuation was invalid and was not the result of an actuation of the reactor protection system when the reactor was critical. The event involved the invalid actuation of 'Emergency AC electrical power systems, including: emergency diesel generators' as discussed in 10 CFR 50.73(a)(2)(iv)(B). | | event text = This notification of a system actuation is provided in accordance with 10 CFR 50.73(a)(2)(iv)(A). The Licensee is providing a telephone notification to the NRC Operations Center in accordance with 10 CFR 50.73(a)(1) instead of submitting a written Licensee Event Report, as the system actuation was invalid and was not the result of an actuation of the reactor protection system when the reactor was critical. The event involved the invalid actuation of 'Emergency AC electrical power systems, including: emergency diesel generators' as discussed in 10 CFR 50.73(a)(2)(iv)(B). | ||
At 1827 on November 16, 2008, with Calvert Cliffs Unit 2 operating at approximately 100% power, the Train A (2A) Emergency Diesel Generator (EDG) automatically started from the standby condition. The automatic start was caused by a degraded switch in the start circuit for the EDG. The 2A EDG successfully started and functioned properly, but did not automatically connect to the associated bus ('21' 4KV Bus) because no bus undervoltage signal was present. The 2A EDG start is considered to be invalid, as the start signal was not generated in response to actual plant conditions or parameters satisfying the requirements for initiation of the EDG start. The start was also not the result of an intentional manual action. | At 1827 on November 16, 2008, with Calvert Cliffs Unit 2 operating at approximately 100% power, the Train A (2A) Emergency Diesel Generator (EDG) automatically started from the standby condition. The automatic start was caused by a degraded switch in the start circuit for the EDG. The 2A EDG successfully started and functioned properly, but did not automatically connect to the associated bus ('21' 4KV Bus) because no bus undervoltage signal was present. The 2A EDG start is considered to be invalid, as the start signal was not generated in response to actual plant conditions or parameters satisfying the requirements for initiation of the EDG start. The start was also not the result of an intentional manual action. | ||
Latest revision as of 22:13, 1 March 2018
| Where | |
|---|---|
Calvert Cliffs  Maryland (NRC Region 1) | |
| Reporting | |
| 10 CFR 50.73(a)(1), Submit an LER, Invalid Actuation | |
| Time - Person (Reporting Time:+565.58 h23.566 days <br />3.367 weeks <br />0.775 months <br />) | |
| Opened: | Kent Mills 13:02 Dec 10, 2008 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Dec 10, 2008 |
| 44708 - NRC Website
| |