ENS 40348
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ENS Event | |
|---|---|
14:10 Nov 21, 2003 | |
| Title | Control Bank "C" Rods Tripped Due to Incorrect Digital Rod Position Indication (Drpi) |
| Event Description | On Friday November 21, 2003, the V.C. Summer Nuclear Station was performing rod position testing in preparation for plant start-up, following refueling outage-14. The testing is in accordance with STP-106.002 Rod Position Indication Operational Test. Control Bank 'C' was being withdrawn. Per STP-106.002, RCS boron concentration was verified adequate to ensure Keff less than or equal to 0.95. When Control Bank 'C' reached 36 steps Digital Rod Position Indication system (DRPI) indication for rod M-4 went to 18 steps. At 0835, Control Rod motion was stopped and Abnormal Operating Procedure (AOP)-403.5, Stuck or Misaligned Control Rod, was entered after reviewing the AOP applicability versus current plant condition. At 0910 while taking action per the AOP, it was determined that both channels of DRPI were not functioning properly and per Tech Spec 3.10.5 the Rx Trip Breakers were immediately opened (manual actuation of the Reactor Protection System - reactor scram). Emergency Operating Procedure (EOP)-1.0, Reactor Trip, was entered. At 0915 EOP-1.0, was exited with the plant stable in Mode 3 (Hot Standby).
At this time it appears there was failure in the DRPI system. This event is being reported in accordance with 10 CFR 50.72(b)(3)(IV)(A), a valid actuation of the Reactor Protection System (RPS). The NRC Resident Inspector was notified of this event by the licensee. |
| Where | |
|---|---|
Summer  South Carolina (NRC Region 2) | |
| Reporting | |
| 10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
| Time - Person (Reporting Time:+1.6 h0.0667 days <br />0.00952 weeks <br />0.00219 months <br />) | |
| Opened: | Phil Rose 15:46 Nov 21, 2003 |
| NRC Officer: | John Mackinnon |
| Last Updated: | Nov 21, 2003 |
| 40348 - NRC Website
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Unit 1 | |
|---|---|
| Reactor critical | Not Critical |
| Scram | Yes, Manual Scram |
| Before | Hot Standby (0 %) |
| After | Hot Standby (0 %) |
WEEKMONTHYEARENS 578592025-08-11T06:12:00011 August 2025 06:12:00
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