ENS 51436

v t e ENS Event
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.

ENS 51436 +/-
Where
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
v • d • e

v t e Emergency Notification System
Byron with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
WEEKMONTHYEAR2016-08-02T14:34:00 [Table view]
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