Helical Flow Control Device for Reactor Core Neutron Stability
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Solution Overview
Problem
Current nuclear reactors face inefficiencies in fluid flow control, leading to uneven neutron activity and heat distribution, which affects reactor stability and fuel usage.
Innovation Solution
A helical flow control device is positioned in the reactor core, slowing the upward flow of fluid to increase the time it spends in the core, enhancing neutron activity and heat transfer by inducing a helical flow path using blades extending from a central shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fluid flows upward through the reactor core in a straight path, then the flow rate is high and heat transfer is efficient, but the neutron activity distribution is uneven and reactor stability is reduced
Solution Approach 1:
The patent applies a helical curvature to the fluid flow path using a helical flow control device with blades extending from a central shaft. This curvature transforms the straight upward flow into a helical path, increasing the residence time of fluid in the core and improving neutron activity distribution while maintaining adequate heat transfer efficiency.
2Quantity of substance
If the fluid spends more time in the reactor core, then neutron activity increases and fuel usage improves, but the flow rate decreases and heat transfer efficiency is reduced
Solution Approach 1:
The helical flow control device creates a curved flow path that increases the effective residence time of fluid in the core without significantly reducing the axial flow rate. The helical path allows fluid to spend more time interacting with fuel elements while maintaining overall circulation speed.
Solution Approach 2:
The invention adds a rotational dimension to the primarily axial flow, creating a helical path that combines upward motion with rotational motion. This dimensional change increases the path length and residence time without sacrificing the vertical transport efficiency needed for heat removal.
3Reliability
If a flow control device is added to induce helical flow, then neutron activity and reactor stability improve, but the device complexity increases
Solution Approach 1:
The helical flow control device serves multiple functions simultaneously: it induces helical flow patterns, increases residence time, improves neutron activity distribution, and enhances mixing. This multi-functionality justifies the added structural complexity by delivering multiple performance benefits from a single device.
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 configuration increases the number of neutron reactions, stabilizes power response, and reduces fuel requirements, improving reactor efficiency and extending its operational life.
Implementation Method 1
A nuclear reactor may include a fluid, such as a cooling fluid, flowing through the nuclear reactor configured to transfer heat from the reactor chamber to a heat collection region
Data Source
AI summary
A flow control device configured to be positioned in a reactor core. The flow control device including a central shaft and at least one blade extending helically from the central shaft. A nuclear reactor and related systems and methods are also disclosed.