ENS 46982

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v t e ENS Event
18:53 Jun 24, 2011
Title	Unusual Event Declared Due to Indications of Fuel Damage
Event Description	The reactor operated at 10 W to 25 kW steady-state power for a total of 25 minutes. At 1257 CDT the Reactor Manager noticed that the radiation monitor (AMS-4) was reading approximately 80 times the Derived Air Concentration (DAC) for Iodine. A second continuous air monitor and a portable thin-window ionization chamber both read background levels of radiation. A high-volume air sampler was used to sample the air near the sampling location of the AMS, which draws air from the reactor deck. The filter from the air sampler read 3700 DPM after drawing 50 cubic feet of air, indicating elevated levels of activity. An HPGe (High Purity Germanium Detector) spectrograph indicated some Cs-137 in the air filter sample, but no I-131. Primary water activity and conductivity were both at normal levels. The indicated DAC of Iodine increased to a value of 149 times DAC before decreasing to 145 times DAC. The Reactor Manager and Radiation Safety Officer agreed that fuel damage was unlikely, but the results of testing were inconclusive, and that it would be prudent to declare an Unusual Event. * * UPDATE FROM JEFFREY GUTHER TO CHARLES TEAL AT 1528 EDT ON 6/24/11 * * * HPGe spectroscopy indicated only background levels of Cs-137 for a air sample, a primary water sample, and a swipe taken from the reactor deck. None of these samples showed I-131. A second portable air sample taken at the reactor deck, but on the opposite side of the deck from the radioactive sampling handling table, did not have elevated counts. The Reactor Manager and Radiation Safety Officer agreed that the AMS-4 was most likely mis-calibrated, and the elevated levels in the first high-volume air sample were probably due to the proximity of the radioactive sample handling table to the sampling location. Notified NRR (Grobe), NRR EO (Evans), R4DO (Deese), IRD (Grant), DHS (Hill), FEMA (Blankenship)

ENS 46982 +/-
Where
Kansas State University Manhattan, Kansas (NRC Region 4)
License number:	R-88
Reporting
Emergency class:	Unusual Event
10 CFR 50.72(a) (1) (i), Emergency Class Declaration
Time - Person (Reporting Time:+-3.97 h-0.165 days <br />-0.0236 weeks <br />-0.00544 months <br />)
Opened:	Jeffrey Guther 14:55 Jun 24, 2011
NRC Officer:	Charles Teal
Last Updated:	Jun 24, 2011
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v • d • e

v t e Emergency Notification System
Kansas State University with 10 CFR 50.72(a)(1)(i), Emergency Class Declaration
WEEKMONTHYEAR2018-07-21T05:00:00 [Table view]
[ENS list for Kansas State University]

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