ENS 43874
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ENS Event | |
|---|---|
06:31 Dec 29, 2007 | |
| Title | Manual Reactor Trip When Five Control Rods Unexpectedly Dropped 20 Inches |
| Event Description | At 2320, on 12/28/07, a Reactor Startup was commenced. At 0025, on 12/29/07 Subgroup #15, of Regulating Group #3, was placed on the hold bus. Placing the Subgroup on the hold bus was a pre-planned action that was briefed prior to the reactor startup, in accordance with an approved interim engineering disposition. The interim engineering disposition was written and approved on 12/28/07 for concerns over CEA #1, of Subgroup #15, dropping into the core unexpectedly. Subgroup #15, of Regulating Group #3, contains five CEA's [CEA # 60, 62, 64, 66 and 1]. At 0047, all Regulating Group CEA's, with the exception of Regulating Group #5, were placed at the Upper Electrical Limit [136 inches withdrawn]. Regulating Group #5 was at 120 inches withdrawn in preparation for diluting to criticality. At 0107, the dilution to criticality was commenced. At 0131, all 5 CEA's in Subgroup #15 slipped into the core approximately 20 inches. A manual reactor trip was then ordered by the unit supervisor. 2-EOP-1, 'Standard Post Trip Actions' was then performed. The unit was borated to shutdown boron concentration. All Safety Functions were met satisfactorily and 2-EOP-1 was exited. The unit was in Mode 3 approaching Mode 2 at the time of the trip. The unit is currently stable in Mode 3, Hot Standby.
Reactor coolant pump heat is being removed using the atmospheric steam dumps. The licensee notified the NRC Resident Inspector. |
| Where | |
|---|---|
Saint Lucie  Florida (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+1.38 h0.0575 days <br />0.00821 weeks <br />0.00189 months <br />) | |
| Opened: | Calvin Ward 07:54 Dec 29, 2007 |
| NRC Officer: | Mark Abramovitz |
| Last Updated: | Dec 29, 2007 |
| 43874 - NRC Website
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Unit 2 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | No |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 560872022-09-03T02:48:0003 September 2022 02:48:00
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