Control rod damping system
Abstract
A damping area or “dash pot” on the upper ends of control rods absorb energy from dropped control rod assemblies without narrowing the diameter of guide tubes. As a result, coolant can freely flow through the guide tubes reducing boiling water issues. The dampening area reduces a separation distance between an outside surface of the control rod and an inside surface of the guide tubes decelerating the control rods when entering a top end of the guide tubes. In another example, the dampening area may be located on a drive shaft. The dampening area may have a larger diameter than an opening in a drive shaft support member that decelerates the drive shaft when dropped by a drive mechanism.
- Inventors:
- Issue Date:
- Research Org.:
- NuScale Power, LLC, Corvallis, OR (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1824030
- Patent Number(s):
- 11024433
- Application Number:
- 15/858,073
- Assignee:
- NuScale Power, LLC (Corvallis, OR)
- Patent Classifications (CPCs):
-
G - PHYSICS G21 - NUCLEAR PHYSICS G21C - NUCLEAR REACTORS
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- DOE Contract Number:
- NE0000633
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 12/29/2017
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Snuggerud, Ross Douglas. Control rod damping system. United States: N. p., 2021.
Web.
Snuggerud, Ross Douglas. Control rod damping system. United States.
Snuggerud, Ross Douglas. Tue .
"Control rod damping system". United States. https://www.osti.gov/servlets/purl/1824030.
@article{osti_1824030,
title = {Control rod damping system},
author = {Snuggerud, Ross Douglas},
abstractNote = {A damping area or “dash pot” on the upper ends of control rods absorb energy from dropped control rod assemblies without narrowing the diameter of guide tubes. As a result, coolant can freely flow through the guide tubes reducing boiling water issues. The dampening area reduces a separation distance between an outside surface of the control rod and an inside surface of the guide tubes decelerating the control rods when entering a top end of the guide tubes. In another example, the dampening area may be located on a drive shaft. The dampening area may have a larger diameter than an opening in a drive shaft support member that decelerates the drive shaft when dropped by a drive mechanism.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jun 01 00:00:00 EDT 2021},
month = {Tue Jun 01 00:00:00 EDT 2021}
}
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Works referenced in this record:
Control rod drive for reactor shutdown
patent, January 1976
- McKeehan, Ernest R.; Shawver, Bruce M.; Schiro, Donald J.
- US Patent Document 3,933,581