eci & npc
TRANSCRIPT
ECI & NPC
ECI
� Purpose� To protect the fuel� To provide cooling to the fuel after loss of
coolant accidents� Provide back-up to normal HTS cooling
during some none LOCA events
Simplified ECI
Water Accumulator
GasAccumulator
ORWaterStorage
HighPressurePumps
ECI HeatExchanger
Recovery Pump
Recovery Sump
LOCA
� Large� HTS voids rapidly� Fuel heats until ECI refills HTS� Ultimately recovery will cool fuel
� Small� Fuel cooled mostly by normal HTS path� Crash cool-down cools HTS� Recovery may be used
Recovery Sump
Grade Level Storage Tank
Accumulator Water Tanks
Accumulator Gas Tanks
Storage Tank
ECI Header
Unit 5 Unit 6 Unit 8Unit 7
To Reactor Headers
Bruce
� High pressure� Low pressure� Recovery
OH #5OVH-28184-00006 R000
Three phases of injection
Containment
� Purpose� Protective envelope that contains radioactive
material released from the heat transport system
� Minimize size and duration of an overpressure in containment following a LOCA
� Maintain containment sub-atmospheric following a LOCA
Pressure Suppression Containment
VacuumBuilding
Tank 1
Tank 3
V4To Spent Fuel Bay Exhaust
V5 V2MV15
MV16AO
AO AO AO
AO
Upper Chamber
Main Chamber
MV1 MV2 MV3Main ChamberPumps
UpperChamberPumps
Vacuum Building Operation
Vacuum Building
Relief Manifold
Pressure Relief DuctsFuelling Machine
Room
Reactor Vaults
5 6 7 8
Containment Envelope
Air Locks and Transfer Chambers
� Allow access and egress from containment� 2 doors one of which must be properly
closed at all times� Correct procedure must be followed when
operating the doors
8'
Vent Duct
APRV CV500
Isolation Valve MV501
Pressure Relief Valve #2
Pressure Relief Valve Manifold Floor
Vacuum Duct
Flap Valve
36" Diameter Pressure Relief Valve Bypass Pipe
PRV and APRV
Pressure Relief Valves
KPa(g)+7
+4
0-1
-2
-3
-5
Containment Pressure
Time
Vault Cooling
� Normally used to maintain the vault temperature less than 40°C
� Sufficient capacity to condense steam from small LOCAs
EFADS & PARMS
� Post accident mitigation systems� Emergency Filter Air Discharge System
� De-misters� HEPA filters� Charcoal filters� Fans
� Post Accident Radiation Monitoring System� Measures what we release after and accident
Emergency water system EWS
� Not the same as emergency water storage system� EWST is the tank in the top of the vacuum building
� EWS� Purpose: a redundant source of cooling water for
decay heat removal in the event of a loss of the normal systems
� 3 pumps in Emergency Water & Power Supply Building
� Suction from the CCW discharge channel