ENS 41383
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ENS Event | |
|---|---|
01:23 Feb 8, 2005 | |
| Title | Manual Reactor Trip During Startup Due to Indication of Misaligned Rod |
| Event Description | The following information was provided by the licensee via facsimile:
While withdrawing Control Bank 'A' during the Reactor Startup, Rod B-10 indicated a rapid drop from approximately 42 steps to 17 steps on the CERPI (Computer Enhanced Rod Position Indication) panel. The reactor operator stopped withdrawal of 'A' control bank and the CERPI indication for rod B-10 remained at 17 steps. The remaining CERPIs in 'A' control bank varied from 40 to 45 steps. The startup was terminated and the reactor was manually tripped in accordance with AP-1 and 1-E-0 [was] initiated. All systems functioned as required on the trip. Initial investigation by I & C and Engineering found no problems with the CERPI indication. Rod Drop time data from the CERPI program shows all rods in Control Bank 'A' had a drop time of 0.32 to 0.38 seconds with the exception of B-10, which had a drop time of 0.18 seconds. An investigation is ongoing as to the cause of rod B-10 misalignment. This notification is being made pursuant to 10 CFR 50.72(b)(3)(iv)(A). The NRC resident was notified of this event. The reactor was subcritical in the Source Range at the initiation of the event. All rods inserted fully during the manual reactor trip. S/G level is being maintained by main feedwater and decay heat removal is via the S/G PORV. |
| Where | |
|---|---|
Surry  Virginia (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+-1.15 h-0.0479 days <br />-0.00685 weeks <br />-0.00158 months <br />) | |
| Opened: | David Herring 00:14 Feb 8, 2005 |
| NRC Officer: | Jeff Rotton |
| Last Updated: | Feb 8, 2005 |
| 41383 - NRC Website | |
Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | Yes, Manual Scram |
| Before | Startup (0 %) |
| After | Hot Shutdown (0 %) |
WEEKMONTHYEARENS 537362018-11-12T05:00:00012 November 2018 05:00:00
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