reactor building closed loop coolingg( ) water (rbclcw) · 2012-12-05 · objectives 1. identify...
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Reactor Building Closed Loop Cooling Water (RBCLCW)g ( )
304B Chapter 11.3
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Objectives
1. Identify the purposes of the Reactor Building Closed Loop Cooling Water (RBCLCW) system.
2. Summarize the function and operation of the following RBCLCW equipment:
a. Pumps
b R i l ti P M/G S t C li W t Pb. Recirculation Pump M/G Set Cooling Water Pumps
c. Heat Exchangers
d. Head Tanks
e. Radiation Monitor
f. Pressure Control Valve
g. Booster Heat Exchangers
h. Isolation Valves
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Objectives
3. Describe the following flow paths:
a. Safety related component cooling
b. Non-safety related component cooling
c. Split system operation
4. List the accident conditions that will result in RBCLCW isolation.
5. Describe the systems response to:
a. Loss of Preferred Power
b. Loss Of Coolant Accident (LOCA)
c. Loss of Station and Instrument Air (SIA) system
6. Describe the RBCLCW system interrelationship with the following:
a. Emergency AC Power system
b. Station and Instrument Air (SIA) system
c. Reactor Building Service Water system
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PurposesThe purposes of the Reactor Building Closed Loop
Cooling Water (RBCLCW) System are to:• Transfer heat from the components cooled by
RBCLCW to the Reactor Building Service Water System via heat exchangers
• Provide cooling water to reactor auxiliary• Provide cooling water to reactor auxiliary equipment and other miscellaneous reactor building equipment during normal operation
• Provide nuclear safety related systems with a redundant means of cooling during an accident condition in order to accomplish and maintain a safe shutdown.
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Overview
• Safety-related loops
• Non-safety related loops
• Accident conditions:– High Drywell Pressure
– Reactor water level 1
• System response to accident conditions
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Flow Paths
• Safety-related loads
• Nonsafety-related loads
• Split system operation
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RBCLCW Safety Related Load List
Safety Related Loop "A"• Fuel Pool Cooling Heat Exchanger A• RHR Pump A & C Seal Coolers• Recirculation Pump A Seal Coolers• Recirculation Pump A Bearing Cooler• Recirculation Pump A Motor Winding Coolers
Safety Related Loop "B"• Fuel Pool Cooling Heat Exchanger B • RHR Pump B & D Seal Coolers• Recirculation Pump B Seal Coolers• Recirculation Pump B Bearing Cooler• Recirculation Pump B Motor Winding Coolers
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RBCLCW Nonsafety Related Load List
Common Nonsafety-Related Loads• Reactor Recirculating Water Pump M/G Set Coolers• Auxiliary Boiler Sample Panel Cooler• Reactor Water Recirculation Sample Panel and Cooler• RWCU Non Regenerative Heat Exchangers• RWCU Pump Coolers
Non Safety Related Loop "A"Non-Safety Related Loop A• Booster Heat Exchanger A
– Drywell air unit coolers– CRD pump A oil cooler.– CRD pump A bearing cooler.– Drywell equipment drain cooler
Non-Safety Related Loop "B"• Booster Heat Exchanger B
– Drywell air unit coolers– CRD pump B oil cooler – CRD pump B bearing cooler
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Pumps
• RBCLCW Pumps
• Recirculation Pump M/G Set Cooling Water Pumps
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Heat Exchangers
• RBCLCW Heat Exchangers
• Booster Heat Exchangers (Coolers)
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Head Tanks
• Surge volume
• NPSH requirements
• Inventory Control
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Radiation Monitor
• Samples drawn from discharge header
• Radioactive in-leakage
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Pressure Control Valve
• Differential pressure across RBCLCW pumps
• Minimizes effect when placing individual coolers in servicecoolers in service
• Normally shut
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Isolation Valves
• Pump Discharge Header Isolation Valves
• Pump Suction Header Isolation Valves
• Nonsafety-Related Loop Isolation Valves
• Recirculation pump M/G set fluid coupling cooling water pumps Valves
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RBCLCW Heat Exchanger Valves
• Temperature Control
• Isolation
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Booster Heat Exchanger (Cooler) Valves
• Outlet temperature control
• Bypass flow
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Normal Operation
• Two RBCLCW pumps in operation
• Third RBCLCW pump in standby
• One RBCLCW heat exchanger in service
• One Booster heat exchanger in service
• Loops are cross-connected
• RWCU non-regenerative heat exchangers supplied by one NSR loop
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Loss of Preferred Power
• Automatic RBCLCW Pump Starts
• RBCLCW heat exchanger inlet valves open
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LOCA
• High Drywell Pressure or Reactor Water Level 1
• Split into two independent safety-related loopsloops
• Nonsafety-related loops are isolated
• Both RBCLCW heat exchangers in service
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Loss of SIA System
• RBCLCW heat exchanger and booster heat exchanger (cooler) temperature control valves fail open
• Head tank level control valves fail open• Head tank level control valves fail open
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System Interfaces
• Emergency AC Power System• Station & Instrument Air System• Reactor Building Service Water
S tSystem• Heat Load Systems
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Summary
• Safety-related
• Nonsafety-related
• LOCA
• Loss of preferred power
• Loss of SIA
• Individual components
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Objectives
1. Identify the purposes of the Reactor Building Closed Loop Cooling Water (RBCLCW) system.
2. Summarize the function and operation of the following RBCLCW equipment:
a. Pumps
b R i l ti P M/G S t C li W t Pb. Recirculation Pump M/G Set Cooling Water Pumps
c. Heat Exchangers
d. Head Tanks
e. Radiation Monitor
f. Pressure Control Valve
g. Booster Heat Exchangers
h. Isolation Valves
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Objectives
3. List the accident conditions that will result in RBCLCW isolation.
4. Describe the systems response to:
a. Loss of Preferred Power
b. Loss Of Coolant Accident (LOCA)
c. Loss of Station and Instrument Air (SIA) system
5. Describe the RBCLCW system interrelationship with the following:
a. Emergency AC Power system
b. Station and Instrument Air (SIA) system
c. Reactor Building Service Water system
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Are there any questions?