ENS 45390

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v t e ENS Event
23:50 Sep 29, 2009
Title	Technical Specification Shutdown Due to Unidentified Leakage from Rcs
Event Description	At 1850 hours0.0214 days <br />0.514 hours <br />0.00306 weeks <br />7.03925e-4 months <br /> CDT, operators initiated a plant shutdown required by Technical Specification 3.4.5, Reactor Coolant System (RCS) Operational Leakage, due to a greater than 2 gpm increase in unidentified leakage within the previous 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> in MODE 1. At 1544 hours0.0179 days <br />0.429 hours <br />0.00255 weeks <br />5.87492e-4 months <br /> CDT, a control room operator noticed drywell pressure increased from 0.68 to 0.81 psig. At 1552, the drywell cooler differential temperature alarm actuated, drywell cooling HVAC chiller amps increased from 50 amps to 56 amps, and the Fission Product Monitor particulate and iodine indications were trending up. At 1555, operators entered the abnormal coolant leakage procedure and evacuated containment. At 1615, drywell floor drain leakage rate alarm actuated. At 1616, plant entered the 4-hour Technical Specification action to verify the source of the unidentified leakage source is not due to service sensitive type 304 or type 316 austenitic stainless steel. At 1730, operators started a power reduction in an attempt to verify the source of the leak. At 1850, the leakage source could not be verified to not be service sensitive stainless steel; entered TS Required Action to be in MODE 3 within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> and MODE 4 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. A reactor shutdown has been initiated. At 1930 floor drain leakage (unidentified leakage) was 3.3 gpm and stable. MODE 3 is expected to be entered by 0350 hours0.00405 days <br />0.0972 hours <br />5.787037e-4 weeks <br />1.33175e-4 months <br /> on 9/30/09. The licensee has notified the NRC Resident Inspector.

ENS 45390 +/-
Where
Clinton Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
LER:	05000461/LER-2009-004
Time - Person (Reporting Time:+-3.07 h-0.128 days <br />-0.0183 weeks <br />-0.00421 months <br />)
Opened:	Jim Peterson 20:46 Sep 29, 2009
NRC Officer:	John Knoke
Last Updated:	Sep 29, 2009
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v • d • e

v t e Emergency Notification System
Clinton with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
WEEKMONTHYEAR2009-09-29T23:50:00 [Table view]
[ENS list for Clinton]

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