ENS 44717
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ENS Event | |
|---|---|
16:42 Dec 12, 2008 | |
| Title | Inadvertent Valid Reactor Trip and Feedwater Isolation Signals Due to Maintenance |
| Event Description | Valid Reactor Trip and Manual Initiation of Auxiliary Feedwater While in MODE 3
At 1042 on 12/12/2008, while in Mode 3, a valid reactor trip signal was generated during I&C maintenance activities on intermediate range nuclear instrument SENI0036. This resulted in a feedwater isolation signal. Reactor Operators manually started both motor driven auxiliary feedwater pumps to maintain steam generator levels. These pumps were started prior to receiving an Auxiliary Feedwater Actuation. Plant is stable in Mode 3. Normal feedwater supply has been restored. The cause of the reactor trip is understood. All systems functioned normally in response to plant conditions. The NRC Resident Inspector has been notified. |
| Where | |
|---|---|
Callaway  Missouri (NRC Region 4) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-2.1 h-0.0875 days <br />-0.0125 weeks <br />-0.00288 months <br />) | |
| Opened: | Greg Kimminau 14:36 Dec 12, 2008 |
| NRC Officer: | Howie Crouch |
| Last Updated: | Dec 12, 2008 |
| 44717 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 570432024-03-22T01:56:00022 March 2024 01:56:00
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