ENS 41450

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v t e ENS Event
08:06 Feb 28, 2005
Title	Discovery of After-The-Fact Emergency Condition - Unusual Event
Event Description	The following information was provided by the licensee via fax (licensee text in quotes): At 1535 [CST] hours on 2/28/05, Byron Station determined that an emergency classification for an Unusual Event was not declared previously at 0206 [CST] on 2/28/05. The missed Unusual Event classification was due to a RCS dose equivalent I-131 value for Byron Unit 1 exceeding the EAL threshold value of >1.0 microCuries/gm [Iodine] for EAL MU7. An RCS iodine sample was taken at 0106 hours0.00123 days <br />0.0294 hours <br />1.752645e-4 weeks <br />4.0333e-5 months <br /> on 2/28/05 during shutdown activities for the B1R13 refueling outage. The sample was analyzed and reported back to the Operations shift at 0206 hours0.00238 days <br />0.0572 hours <br />3.406085e-4 weeks <br />7.8383e-5 months <br /> with a value of 1.07 microCuries/gm[Iodine]. This sample has been reconfirmed. At 0206 on 2/28/05, Byron Unit 1 was not in the mode of applicability for the RCS coolant activity Technical Specification 3.4.16. It was not recognized at that time that the EAL threshold value was exceeded until 1535 hours0.0178 days <br />0.426 hours <br />0.00254 weeks <br />5.840675e-4 months <br /> on 2/28/05. Note that a subsequent RCS sample taken at 0930 on 2/28/05 determined that the EAL threshold value is no longer exceeded and the current value remains less than the threshold. Byron Unit 1 has been operating the current cycle with an estimated 1-3 leaking fuel rods and special limitations were implemented by the site during shutdown. This notification is being made in accordance with the requirements of 10 CFR 50.72(a) for a missed declaration of an Unusual Event for RCS dose EQ I-131 exceeding the EAL threshold value of 1.0 microCuries/gm[Iodine] during shutdown activities for the Byron Unit 1 refueling outage. This issue has been placed in the Byron Corrective Action Program. The licensee will notify the NRC Resident Inspector, State and Local agencies.

ENS 41450 +/-
Where
Byron Illinois (NRC Region 3)
Reporting

Other Unspec Reqmnt
Time - Person (Reporting Time:+9.35 h0.39 days <br />0.0557 weeks <br />0.0128 months <br />)
Opened:	Scott Fruin 17:27 Feb 28, 2005
NRC Officer:	Jeff Rotton
Last Updated:	Feb 28, 2005
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v • d • e

v t e Emergency Notification System
Byron with Other Unspec Reqmnt
WEEKMONTHYEAR2012-02-03T06:00:00 [Table view]
[ENS list for Byron]

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