ENS 41663

v t e ENS Event
17:10 May 3, 2005
Title	Appendix R Fire Scenario Involving Multiple High Impedance Faults
Event Description	TMI Issue Report # 329440 identifies an issue associated with a previously unidentified/unanalyzed Appendix R fire scenario involving multiple high impedance faults. An engineering evaluation has determined that certain safety related power circuits are not protected against multiple high impedance faults, which in combination with a fire in the 305' elevation of the Control Building, could cause a loss of safe shutdown functions from the control room and the remote shutdown panel. An hourly fire-watch has been established in the affected fire zone in the 305' elevation of the Control Building as an interim compensatory measure. The NRC Resident Inspector will be notified.

ENS 41663 +/-
Where
Three Mile Island Pennsylvania (NRC Region 1)
Reporting

10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
Time - Person (Reporting Time:+-2.63 h-0.11 days <br />-0.0157 weeks <br />-0.0036 months <br />)
Opened:	Adam Miller 14:32 May 3, 2005
NRC Officer:	Chauncey Gould
Last Updated:	May 3, 2005
41663 - NRC Website
v • d • e

v t e Emergency Notification System
Three Mile Island with 10 CFR 50.72(b)(3)(ii)(B), Unanalyzed Condition
WEEKMONTHYEAR2017-12-06T14:58:00 [Table view]
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