ENS 45409
ENS Event | |
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22:34 Oct 3, 2009 | |
Title | Automatic Reactor Scram Following Msiv Closure |
Event Description | On 10/03/09 at 1734 CDT, Unit 3 scrammed due to a Group 1 MSIV closure. The cause of the event is being investigated. The 2/3 Emergency Diesel Generator also auto-started during the event. The cause of the auto start is also being investigated.
All rods fully inserted. The reactor is currently stable in Mode 3 with makeup water coming from the control rod drive system and decay heat removal from the isolation condenser. All systems functioned as required with the exception of the unexplained MSIV closure and the auto start of the 2/3 EDG. There was no impact on Unit 2 and the plant is in a normal post-scram electrical lineup. There was no need for the 2/3 EDG to auto-start and it did not load. Group 2 and 3 isolations were also received during the transient which is expected and normal. Reactor water level is being maintained between 8 and 48 inches and pressure between 800 and 1060 psi. Investigation of the cause of the MSIV closure is in progress The licensee stated that there were no activities or surveillances in progress at the time that could have caused the MSIV closure. The NRC Resident Inspector has been notified. |
Where | |
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Dresden ![]() Illinois (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:+-2.13 h-0.0888 days <br />-0.0127 weeks <br />-0.00292 months <br />) | |
Opened: | Frank Winter 20:26 Oct 3, 2009 |
NRC Officer: | Bill Huffman |
Last Updated: | Oct 3, 2009 |
45409 - NRC Website
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Unit 3 | |
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Reactor critical | Critical |
Scram | A/R |
Before | Power Operation (99 %) |
After | Hot Shutdown (0 %) |
Dresden ![]() | |
WEEKMONTHYEARENS 559882022-07-12T13:03:00012 July 2022 13:03:00
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