Instrument thimble tube shroud
Patent
·
OSTI ID:6441139
In a nuclear reactor having a core, a core support plate, a flow distribution plate, an instrument guide thimble extending into the core from the flow distribution plate, in-core instrumentation means for monitoring reactor operations extendable through the core support plate and flow distribution plate into the guide thimble, and, means for reducing flow induced vibration of the instrumentation means is described comprising: an instrument shroud disposed between the core support plate and flow distribution plate and having a cup with first and second openings for passing the instrument means there through, the first opening disposed adjacent an opening in the flow distribution plate and being of sufficient diameter to allow fluid flow into the instrument guide thimble, the second opening disposed adjacent to the core support plate and being of sufficient diameter to allow fluid flow into the cup, the cup having passages for diverting part of the fluid flow received from the second opening away from the instrument guide thimble, and, one or more shroud arms extending radially from the cup for engaging a substantially parallel core structure, each shroud arm having means for engaging the adjacent core structure at an end thereof, said engaging means having a locking pad disposed at the end of each shroud arm and spring means extending resiliently from each pad for biasing the shroud into position, the shroud arms preventing movement of the shroud due to fluid flow.
- Assignee:
- Siemens Power Corporation, Bellevue, WA (United States)
- Patent Number(s):
- A; US 5215707
- Application Number:
- PPN: US 7-758988
- OSTI ID:
- 6441139
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
22 GENERAL STUDIES OF NUCLEAR REACTORS
220400* -- Nuclear Reactor Technology-- Control Systems
COOLING SYSTEMS
DESIGN
FLUID FLOW
GUIDE TUBES
IN CORE INSTRUMENTS
MECHANICAL VIBRATIONS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTOR CORES
REACTOR INSTRUMENTATION
REACTOR MONITORING SYSTEMS
SHROUDS
STABILITY
TUBES
220400* -- Nuclear Reactor Technology-- Control Systems
COOLING SYSTEMS
DESIGN
FLUID FLOW
GUIDE TUBES
IN CORE INSTRUMENTS
MECHANICAL VIBRATIONS
REACTOR COMPONENTS
REACTOR COOLING SYSTEMS
REACTOR CORES
REACTOR INSTRUMENTATION
REACTOR MONITORING SYSTEMS
SHROUDS
STABILITY
TUBES