Suppression of malfunction under water-solid conditions
Patent
·
OSTI ID:6148978
Malfunction under water-solid conditions responsive either to increase in mass flow or increase in heat flow into the reactor coolant is suppressed. The power-actuable reactor-coolant relief valve is opened for increase in reactor-coolant mass influx if the rate of change of coolant pressure exceeds a setpoint during a predetermined interval, if, during this interval, the coolant temperature is less than a setpoint and if the level of the fluid in the pressurizer is above a predetermined setpoint (water-solid state). The interval is set to preclude opening of the relief valve for transients. The relief valve is opened responsive to increased influx of heat to the reactor coolant only while the coolant pump operates for a predetermined interval after it starts, if the level of the fluid in the pressurizer is above a setpoint, if either the difference between the temperature of the secondary fluid in the steam generator and the temperature of the coolant is above a predetermined setpoint or the difference between the temperature of the coolant and of the coolant in the loop seal is greater than a predetermined setpoint and if the coolant temperature is less than the setpoint.
- Assignee:
- Westinghouse Electric Corp.
- Patent Number(s):
- US 4470948
- OSTI ID:
- 6148978
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
CONTROL
CONTROL EQUIPMENT
COOLANTS
COOLING SYSTEMS
DESIGN
ENERGY SYSTEMS
ENERGY TRANSFER
EQUIPMENT
FAILURES
FLOW REGULATORS
FLUID MECHANICS
HEAT TRANSFER
HYDRAULICS
MASS TRANSFER
MECHANICS
PRESSURE CONTROL
PWR TYPE REACTORS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTORS
RELIEF VALVES
TEMPERATURE CONTROL
VALVES
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200 -- Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled
22 GENERAL STUDIES OF NUCLEAR REACTORS
220900* -- Nuclear Reactor Technology-- Reactor Safety
ACCIDENTS
CONTROL
CONTROL EQUIPMENT
COOLANTS
COOLING SYSTEMS
DESIGN
ENERGY SYSTEMS
ENERGY TRANSFER
EQUIPMENT
FAILURES
FLOW REGULATORS
FLUID MECHANICS
HEAT TRANSFER
HYDRAULICS
MASS TRANSFER
MECHANICS
PRESSURE CONTROL
PWR TYPE REACTORS
REACTOR ACCIDENTS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTORS
RELIEF VALVES
TEMPERATURE CONTROL
VALVES
WATER COOLED REACTORS
WATER MODERATED REACTORS