Method and means for abruptly terminating the flow of fluid in closed circulating systems of nuclear reactor plants or the like. [PWR]
A nuclear steam supply system is described wherein each of a plurality of centrifugal pumps begins to operate with full cavitation in response to an abrupt drop of system pressure in the event of leakage. This is achieved by influencing the net positive suction head of each pump over the entire range of fluid flow and/or by influencing the net positive suction head upstream of the pumps. The first mode of causing the pumps to operate with full cavitation includes an appropriate selection of the inlet angle and/or inlet diameter of the pump impeller, the provision of auxiliary impellers which are located upstream of the pumps and can circulate the fluid in or counter to the direction of rotation of the respective pump impellers, or the provision of suitably curved guide vanes in the pumps. The second mode include interrupting the admission of undercooled fluid into the system upstream of the pumps.
- Assignee:
- Klein, Schanzlin and Becker Aktiengesellschaft
- Patent Number(s):
- US 3977808
- Application Number:
- TRN: 77-001102
- OSTI ID:
- 7249688
- Resource Relation:
- Patent Priority Date: Priority date 2 Sep 1972, German, Federal Republic of (F.R. Germany)
- Country of Publication:
- United States
- Language:
- English
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PRIMARY COOLANT CIRCUITS
PUMPS
CONTROL SYSTEMS
PWR TYPE REACTORS
FLOW RATE
PRESSURE GRADIENTS
COOLING SYSTEMS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210200* - Power Reactors
Nonbreeding
Light-Water Moderated
Nonboiling Water Cooled