ENS 42685
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ENS Event | |
|---|---|
07:59 Jul 4, 2006 | |
| Title | Reactor Scram on Group 1 Isolation |
| Event Description | On 7/04/06 at approximately 0259, Unit 2 received a Group 1 isolation on Main Steam Line High Flow. All Group 1 valves closed as required and the reactor scrammed. The Isolation Condenser was manually initiated to control reactor pressure. Group 2 and 3 Containment Isolations occurred as expected. Investigation into the cause of the Group 1 isolation is in progress. All systems responded as required with no abnormalities noted.
All rods fully inserted. Water level is being maintained with normal feed and reactor heat removal and pressure control is being controlled via the isolation condenser within normal range. The licensee was in no significant tech spec LCO at the time of the event and all safety related equipment was available if needed. The scram had no impact on Unit 3 operation. The licensee stated that there was no evidence of any main steam system leak or actual condition that could account for the main steam high flow signal. The licensee notified the NRC Resident Inspector. The licensee also notified the State Inspector. |
| Where | |
|---|---|
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:+-2.63 h-0.11 days <br />-0.0157 weeks <br />-0.0036 months <br />) | |
| Opened: | Paul Salgado 05:21 Jul 4, 2006 |
| NRC Officer: | Bill Huffman |
| Last Updated: | Jul 4, 2006 |
| 42685 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Critical |
| Scram | A/R |
| Before | Power Operation (98 %) |
| After | Hot Shutdown (0 %) |
Dresden with 10 CFR 50.72(b)(2)(iv)(B), RPS System Actuation, 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
WEEKMONTHYEARENS 559882022-07-12T13:03:00012 July 2022 13:03:00
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