ENS 42406

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v t e ENS Event
06:00 Mar 11, 2006
Title	Unit Entered a T.S. Required Shutdown After Declaring Both Condenser Offgas Radiation Monitors Inoperable
Event Description	Condenser offgas radiation monitor flow was blocked. Both Offgas Radiation Monitors were affected and out of service. We entered T.S. 3.0.1 - When a Limiting Condition for Operation is not met, within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> action shall be initiated to place the unit in a condition in which the specification does not apply: 1. Hot Standby within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. 2. Hot Shutdown with following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. 3. Cold Shutdown with subsequent 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. We started to shutdown the Unit at 0100 [hours] on 11 March 2006. Removed blockage from condenser offgas radiation monitors common exhaust and evaluated operability of the condenser offgas radiation monitors. At 0315 [hours] on 11 March 2006, we returned RM-A-5 and RM-A-15 [Condenser Offgas Radiation Monitors] to service and exited T.S. 3.0.1. We stopped the power reduction at 0251 [hours] on 11 March 2006 while performing the evaluation on the condenser offgas radiation monitors. We stopped the power reduction at 73% reactor power. We started power escalation to 100% at 0338 [hours] on 11 March 2006. The blockage was discovered at 2125 hours0.0246 days <br />0.59 hours <br />0.00351 weeks <br />8.085625e-4 months <br /> on 3/10/2006 during rounds by Secondary Plant Operator who noted that the normal 1 SCFM exhaust flow was reading zero flow. During troubleshooting to discover the cause of the blockage, a bluish foreign material was found in the common exhaust piping. An investigation is underway to identify the source of the foreign material. The licensee informed the NRC Resident Inspector.

ENS 42406 +/-
Where
Three Mile Island Pennsylvania (NRC Region 1)
Reporting

10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
Time - Person (Reporting Time:+2.58 h0.108 days <br />0.0154 weeks <br />0.00353 months <br />)
Opened:	George Herneisey 08:35 Mar 11, 2006
NRC Officer:	Steve Sandin
Last Updated:	Mar 11, 2006
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v • d • e

v t e Emergency Notification System
Three Mile Island with 10 CFR 50.72(b)(2)(i), Tech Spec Required Shutdown
WEEKMONTHYEAR2012-08-22T06:28:00 [Table view]
[ENS list for Three Mile Island]

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