ENS 51436
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ENS Event | |
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14:06 Oct 1, 2015 | |
Title | Mode Change with Turbine Trip Leads Lifted |
Event Description | At 0906 [CDT], it was determined that U1 [Unit 1] was in a condition that could have prevented fulfillment of the turbine trip safety function and TS [Tech Spec] 3.0.3 was entered. Leads had been lifted to disable the turbine trip function on both SSPS [Solid State Protection System] trains while U1 was in Mode 4 (which is outside the mode of applicability). However, at 0059 [CDT], U1 entered Mode 3 with these leads still lifted. In Mode 3, both trains of the turbine trip function are required to be operable per TS 3.3.2. The turbine was subsequently tripped at 0932 [EDT] and the leads were re-landed enabling the turbine trip function at 0946 [CDT], TS 3.0.3 was subsequently exited. This condition is being reported in accordance with 10 CFR 50.72 (b)(3)(v)(D) for an event or condition that could have prevented the fulfillment of a safety function to mitigate the consequences of an accident.
The Byron NRC site Resident Inspector has been notified of this condition. The licensee has notified the State of Illinois. |
Where | |
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Byron ![]() Illinois (NRC Region 3) | |
Reporting | |
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident | |
LER: | 05000454/LER-2015-006 |
Time - Person (Reporting Time:+0.53 h0.0221 days <br />0.00315 weeks <br />7.25994e-4 months <br />) | |
Opened: | Greg Gugle 14:38 Oct 1, 2015 |
NRC Officer: | Daniel Mills |
Last Updated: | Oct 1, 2015 |
51436 - NRC Website
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Unit 1 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Hot Standby (0 %) |
After | Hot Standby (0 %) |
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