Fusion Reactor Coolant Flow Shaper for Neutron Shielding
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Solution Overview
Problem
Existing inertial confinement fusion reactors face challenges in efficiently absorbing high-energy neutrons and managing coolant flow to minimize reactor wall degradation and parasitic power loads, leading to high coolant flow rates and large reactor volumes.
Innovation Solution
The design incorporates a centrifugal flow system with an annular trough and weir to distribute coolant evenly, maintaining a central void region and using a flow shaper to optimize coolant thickness and distribution, minimizing neutron absorption on the reactor walls and reducing the need for high flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high coolant flow rates are used to absorb neutrons and cool the reactor, then neutron absorption and cooling effectiveness improve, but parasitic power loads and reactor size increase
Solution Approach 1:
The coolant system is segmented into two distinct pathways: an inner coolant pathway with lower flow rate for neutron absorption and heating, and an outer coolant pathway with higher flow rate for cooling the reactor walls. This segmentation allows each pathway to be optimized for its specific function, reducing overall parasitic power load while maintaining effective neutron absorption and cooling.
Solution Approach 2:
Different coolant flow rates are applied to different spatial regions: the inner region (closer to the reaction zone) receives lower flow rate coolant primarily for neutron absorption, while the outer region (closer to the walls) receives higher flow rate coolant for wall cooling. This local differentiation optimizes the balance between neutron absorption effectiveness and parasitic power consumption.
2Temperature
If high coolant flow rates are used to manage heat, then cooling effectiveness improves, but reactor size and material exposure increase
Solution Approach 1:
The cooling function is segmented between two pathways: the inner pathway handles heat removal from the reaction zone with lower flow rate, while the outer pathway provides intensive cooling to the reactor walls with higher flow rate. This segmentation enables effective temperature control without requiring a uniformly high flow rate throughout the entire reactor volume, thus reducing overall reactor size.
Solution Approach 2:
Cooling intensity is differentiated by location: the outer coolant pathway delivers higher flow rates to regions requiring intensive cooling (reactor walls), while the inner pathway uses lower flow rates in regions where moderate cooling suffices. This local optimization reduces the total coolant volume and reactor size needed while maintaining effective temperature control.
3Temperature
If coolant is directed along wall surfaces, then wall cooling improves, but neutron absorption on walls increases
Solution Approach 1:
The coolant flow is segmented into two functional streams: an inner stream that absorbs neutrons and heat from the reaction zone without directly contacting the walls, and an outer stream that cools the walls by flowing along their surfaces. This segmentation allows wall cooling to occur while minimizing the neutron-absorbing coolant's exposure to wall surfaces, reducing parasitic neutron absorption.
4Object-affected harmful factors
If reactor volume is reduced to minimize material exposure, then material degradation decreases, but coolant flow rate requirements increase
Solution Approach 1:
The reactor design segments the coolant system into inner and outer pathways with differentiated flow rates and functions. The outer pathway provides intensive cooling to walls with higher flow rates, preventing excessive heat buildup that would require larger reactor volumes. The inner pathway handles neutron absorption with lower flow rates. This segmentation enables compact reactor design with reduced material exposure while maintaining appropriate coolant quantities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design extends reactor operation time by protecting structural walls from neutron irradiation, reduces parasitic power loads, and optimizes tritium production while minimizing reactor size and material exposure.
Implementation Method 1
The first coolant is to overflow a top end of the flow shaper, flow along an inner surface defined by the flow shaper
Implementation Method 2
The design incorporates a centrifugal flow system with an annular trough and weir to distribute coolant evenly
Implementation Method 3
Existing inertial confinement fusion reactors face challenges in efficiently absorbing high-energy neutrons
Implementation Method 4
The first coolant is to overflow a top end of the flow shaper, flow along an inner surface defined by the flow shaper, and exit the reactor through the coolant outlet
Implementation Method 5
The design incorporates a centrifugal flow system with an annular trough and weir to distribute coolant evenly
Implementation Method 6
inertial confinement fusion reactor
Data Source
AI summary
An inertial confinement fusion reactor comprising a chamber, a first coolant inlet, a coolant outlet, a flow shaper disposed within the chamber, and a second coolant inlet. The first coolant inlet is configured to receive and direct a first coolant into a reservoir defined between a chamber wall and an outer surface defined by the flow shaper. The first coolant is to overflow a top end of the flow shaper, flow along an inner surface defined by the flow shaper, and exit the reactor through the coolant outlet. The second coolant inlet is configured to dispense a second coolant in a plurality of predefined streams such that a central void region is defined between the plurality of predefined streams, the central void region positioned at least partially within the interior region defined by the flow shaper, and the second coolant is to exit the reactor through the coolant outlet.