ENS 49039
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ENS Event | |
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06:56 May 16, 2013 | |
Title | Manual Reactor Trip During Control Rod Testing |
Event Description | On May 16, 2013, at 0256 EDT, while in Mode 3 (subcritical), operators manually opened the reactor trip breakers as directed by procedure. During rod drop testing, demand position and digital rod position indication did not agree within procedural limits. As directed by procedure, operators opened the reactor trip breakers. The cause of the discrepancy is under investigation. The plant responded as expected and all rods inserted as required. The plant remains stable in Mode 3.
This condition is reportable pursuant to 10 CFR 50.72(b)(3)(iv). The NRC Senior Resident Inspector has been notified.
The purpose of this call is to retract the report made on May 16, 2013, Event Number 49039. Operators manually opened the reactor trip breakers in MODE 3 during hot control rod drop testing as directed by procedure. The condition has been determined to be an invalid actuation of the RPS since boron concentration, and not control rods, were being relied upon for safety function during rod testing. The details of the engineering review will be provided to the NRC Senior Resident Inspector. Notified R1DO (Cook). |
Where | |
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Millstone Connecticut (NRC Region 1) | |
Reporting | |
10 CFR 50.72(b)(3)(iv)(A), System Actuation | |
Time - Person (Reporting Time:+3.4 h0.142 days <br />0.0202 weeks <br />0.00466 months <br />) | |
Opened: | Michael Weise 10:20 May 16, 2013 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Jul 10, 2013 |
49039 - NRC Website
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Unit 3 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Hot Standby (0 %) |
After | Hot Standby (0 %) |
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