ENS 56970: Difference between revisions
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| emergency class = Non Emergency | | emergency class = Non Emergency | ||
| notification date = 02/16/2024 02:05 | | notification date = 02/16/2024 02:05 | ||
| retracted = Yes | |||
| notification by = Tyson Jones | | notification by = Tyson Jones | ||
| NRC officer = Kerby Scales | | NRC officer = Kerby Scales | ||
| event date = 02/15/2024 22:24 EST | | event date = 02/15/2024 22:24 EST | ||
| last update date = 02/ | | last update date = 02/21/2024 | ||
| title = Actuation of Emergency Diesel Generator System | | title = Actuation of Emergency Diesel Generator System | ||
| event text = The following information was provided by the licensee via email: | | event text = The following information was provided by the licensee via email: | ||
| Line 21: | Line 22: | ||
This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the emergency diesel generator system. | This event is being reported in accordance with 10 CFR 50.72(b)(3)(iv)(A) as an event that results in a valid actuation of the emergency diesel generator system. | ||
There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. | There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified. | ||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/ | * * * RETRACTION ON 2/21/2024 AT 1549 EST FROM TYSON JONES TO KAREN COTTON * * * | ||
The following information was provided by the licensee via email: | |||
In accordance with NUREG-1022, Section 2.8 and Section 4.2.3, Watts Barr is retracting the previous report EN 56970 pursuant to 10 CFR 50.72(b)(3)(iv)(A). The start signal for the 1A-A, 1B-B, and 2B-B emergency diesel generators (EDG)s was from activation of the common emergency start of the 2A-A EDG. The actuation was not from a loss of offsite power (LOOP) to any shutdown board or from any parameters that would initiate a safety injection (SI) signal, for which the EDG is designed to provide a design basis safety function. Also, the starts were not from intentional manual actuation. Starting the EDGs did not make them inoperable and each EDG was able to perform its design safety function. | |||
The common emergency start relay for each diesel is not safety related. It is an anticipatory and redundant circuit to start other EDGs in the event of a LOOP or SI related to the specific EDG. With the 2A-A EDG out of service, the associated common emergency circuit would not be required to perform any function. The starts were not initiated in response to actual plant conditions or parameters satisfying the requirements for initiation of the system. Since the starts were not initiated via an automatic signal from a LOOP, SI, or traditional operator action, the signal is not a valid actuation in accordance with 10 CFR 50.72(b)(3)(iv)(A). Therefore, EN 56970 is being retracted. | |||
The NRC Resident Inspector has been notified of this retraction. | |||
Notified R2DO (Miller) | |||
| URL = https://www.nrc.gov/reading-rm/doc-collections/event-status/event/2024/20240222en.html#en56970 | |||
}}{{unit info | }}{{unit info | ||
| Unit = 1 | | Unit = 1 | ||
Latest revision as of 07:30, 22 February 2024
| Where | |
|---|---|
Watts Bar  Tennessee (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.32 h-0.055 days <br />-0.00786 weeks <br />-0.00181 months <br />) | |
| Opened: | Tyson Jones 02:05 Feb 16, 2024 |
| NRC Officer: | Kerby Scales |
| Last Updated: | Feb 21, 2024 |
| 56970 - NRC Website
| |