ENS 50587: Difference between revisions
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| event date = 11/01/2014 02:48 EDT | | event date = 11/01/2014 02:48 EDT | ||
| last update date = 11/01/2014 | | last update date = 11/01/2014 | ||
| title = Dual Unit Manual Reactor Trips Due | | title = Dual Unit Manual Reactor Trips Due to Lowering Condenser Vacuum and Degraded Forebay | ||
| event text = On November 1, 2014, at 0249 [EDT], DC Cook Unit 1 reactor was manually tripped and at 0248 [EDT] DC Cook Unit 2 was manually tripped due lowering condenser vacuum caused by degraded forebay conditions (observed thick grass and sand). U-1 and U-2 entered Abnormal Operating Procedure for Degraded Forebay on November 1, 2014 at 0153 [EDT]. Conditions degraded in U-1 and U-2 until all but 2 screens in each unit were tripped on overload and main condenser vacuum was lowering. U-1 and U-2 met criteria in the Degraded Forebay procedure to remove the units from service and remove all circulating water pumps from service. | | event text = On November 1, 2014, at 0249 [EDT], DC Cook Unit 1 reactor was manually tripped and at 0248 [EDT] DC Cook Unit 2 was manually tripped due lowering condenser vacuum caused by degraded forebay conditions (observed thick grass and sand). U-1 and U-2 entered Abnormal Operating Procedure for Degraded Forebay on November 1, 2014 at 0153 [EDT]. Conditions degraded in U-1 and U-2 until all but 2 screens in each unit were tripped on overload and main condenser vacuum was lowering. U-1 and U-2 met criteria in the Degraded Forebay procedure to remove the units from service and remove all circulating water pumps from service. | ||
This event is reportable under 10 CFR 50.72(b)(2)(iv)(B), Reactor Protection System (RPS) actuation, as a four (4) hour report, and under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of the Auxiliary Feedwater System, as an eight (8) hour report. | This event is reportable under 10 CFR 50.72(b)(2)(iv)(B), Reactor Protection System (RPS) actuation, as a four (4) hour report, and under 10 CFR 50.72(b)(3)(iv)(A), specified system actuation of the Auxiliary Feedwater System, as an eight (8) hour report. | ||
Latest revision as of 20:49, 1 March 2018
| Where | |
|---|---|
Cook  Michigan (NRC Region 3) | |
| Reporting | |
| 10 CFR 50.72(b)(2)(iv)(B), RPS Actuation 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.75 h-0.0729 days <br />-0.0104 weeks <br />-0.0024 months <br />) | |
| Opened: | Perry Graham 05:03 Nov 1, 2014 |
| NRC Officer: | Daniel Mills |
| Last Updated: | Nov 1, 2014 |
| 50587 - NRC Website
| |
Cook with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | ||
| Automatic Reactor Trip [Table view] | ||