Ashley Mossa Westinghouse PRA Engineer. Nuclear 411 Fire Protection has been a “hot” topic...
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Transcript of Ashley Mossa Westinghouse PRA Engineer. Nuclear 411 Fire Protection has been a “hot” topic...
Ashley MossaWestinghouse PRA Engineer
Nuclear 411 Fire Protection has been a “hot” topic since
the Browns Ferry Fire in 1975 The Main Control Room (MCR) contains
instrumentation & control for virtually all plant equipment and is used to shut down the plant
An alternate shutdown panel can be used in case of MCR evacuation
An industry move to a new fire protection program NFPA 805 is costing NPPs millions of dollars in analyses and plant modifications.
Typical MCR
Importance of the MCR Redundancy & diversity throughout the plant However MCR is where all instrumentation and
controls come together.
Problem Statement
Determine, for a variety of fire sizes, when operators must abandon the control room due to habitability concerns. Temperature Heat Flux Optical Density
Using the data above, determine the probability of operators leaving the control room
Project Steps
Understand FDS Build FDS Code Run for a variety of fire sizes &
conditions Analyze results Determine the probability of
operators abandoning the MCR for the ASP
Results for Non-Ventilated Case Non-vented fires of 400kW or less
did not require MCR abandonment
Fire Size in kW (HRR)
Fastest Time to Damage (minutes)
500 18.6600 13.4700 11.8800 11.0900 10.41000 9.91200 9.21500 8.21700 7.92000 7.2
Questions?