ENS 42300

v t e ENS Event
01:43 Feb 2, 2006
Title	Inoperable Isolation Condenser
Event Description	While performing DIS 1300-02, Unit 2 ISO COND Steam/Condensate Line High Flow Calibration, workers attempted to valve in DPIS 2-1349-8, U2 Isolation Condenser Return Line Hi Flow. While opening the low isolation valve the technician noticed a vibration in the sensing line. He proceeded to close the equalizer and open the high isolation. As he opened the high side isolation the DPIS indication started to ramp high. As the indication ramped above about 9 inches the technician closed the high side isolation valve. The Isolation Condenser has been isolated to comply with Technical Specification entered TS 3.3.6.1 C.1 and F.1, Primary Containment Isolation Instrumentation and TS 3.5.3. A.1 & A.2, Isolation Condenser. A prompt investigation has been initiated to determine the cause. A troubleshooting plan is being developed. Per Tech Spec Bases Section 3.5.3, Applicable Safety Analysis, credit is taken for the Isolation Condenser in the loss of Feedwater Transient Analysis. Therefore the event is reportable under 10CFR 50.72.(b)(3)(v)(D). The licensee notified the NRC Resident Inspector.

ENS 42300 +/-
Where
Dresden Illinois (NRC Region 3)
Reporting

10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
Time - Person (Reporting Time:+0 h0 days <br />0 weeks <br />0 months <br />)
Opened:	Dennis Francis 01:43 Feb 2, 2006
NRC Officer:	Jeff Rotton
Last Updated:	Feb 2, 2006
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v • d • e

v t e Emergency Notification System
Dresden with 10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
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