Neutron Source Rodlet Assembly Segmentation
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Solution Overview
Problem
Current neutron source rod assemblies for nuclear reactors are costly and cumbersome to handle and ship due to their large size and irradiated components, requiring specialized handling and equipment, which increases transportation costs and radiation exposure risks.
Innovation Solution
A new neutron source rod assembly design featuring a separate neutron source positioning rodlet assembly and source capsule assembly that can be shipped independently and assembled on-site, with a compact source capsule assembly and secure mechanical couplings to reduce handling risks and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If neutron source rod assemblies are designed as large integrated units, then they provide sufficient neutron source strength and structural stability, but they increase transportation costs and radiation exposure risks due to their size and require specialized handling equipment
Solution Approach 1:
The neutron source rod assembly is divided into multiple separable components: a source capsule assembly containing the neutron source material, a positioning rodlet assembly for precise placement, and a mounting assembly for securing to the reactor core. These segments can be transported separately using standard equipment and assembled at the reactor site, reducing transportation costs and radiation exposure while maintaining the required neutron source strength when assembled.
Solution Approach 2:
The neutron source material is extracted and encapsulated in a separate source capsule assembly that can be independently transported and handled. This allows the radioactive component to be separated from the structural and positioning components, enabling specialized handling of only the necessary portion and reducing overall transportation requirements.
2Stability of the object's composition
If neutron source rod assemblies are designed as large integrated units, then they ensure structural stability and proper positioning, but they require large hot cells for manufacturing and increase radiation exposure risks
Solution Approach 1:
By segmenting the assembly into separately transportable components, each component can be manufactured in smaller hot cells with reduced shielding requirements, thereby reducing radiation exposure for workers and lowering manufacturing costs while maintaining positioning accuracy through the dedicated positioning rodlet assembly.
Solution Approach 2:
The source capsule assembly and positioning rodlet assembly are prepared separately in advance in smaller hot cells, allowing for preliminary quality control and positioning verification before final assembly at the reactor site. This preliminary preparation reduces the need for large hot cells and minimizes radiation exposure during the assembly process.
3Reliability
If neutron source rod assemblies are designed as large integrated units, then they maintain fixed position during operation, but they increase transportation costs and require specialized carriers
Solution Approach 1:
The assembly is segmented into components that can be transported using standard equipment and procedures, eliminating the need for expensive specialized carriers. The components are designed with standardized interfaces that ensure proper positioning and stability when assembled at the reactor site, maintaining position stability while significantly reducing transportation costs.
4Reliability
If neutron source rod assemblies are designed as large integrated units, then they provide complete functionality, but they are cumbersome to handle and ship
Solution Approach 1:
The complete functional assembly is divided into manageable segments that can be easily handled and transported. Each segment is designed to be self-contained with specific functions: the source capsule provides neutron emission, the positioning rodlet ensures accurate placement, and the mounting assembly secures the component to the reactor core. When assembled, these segments provide complete functionality equivalent to a large integrated unit but with significantly improved handling ease.
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 reduces shipping costs and radiation exposure by allowing for smaller, more manageable components and easier handling, enabling more carriers to transport the assemblies and reducing the need for large hot cells, thus improving the manufacturing and deployment process.
Implementation Method 1
a source capsule assembly which sealably encloses a neutron source material
Implementation Method 2
The neutron source positioning rodlet assembly and the source capsule assembly are capable of being shipped independently of each other and fixedly connected to each other at an assembly site
Data Source
AI summary
A neutron source rodlet assembly having a separate source capsule assembly that is not encapsulated within the neutron source rodlet assembly. The neutron source rodlet assembly is made up, at least in part, of a neutron source positioning rodlet assembly and the source capsule assembly configured such that assembly together is feasible at a remote site and they can be shipped separately. The source capsule assembly has outer and inner capsules with the outer capsule having a threaded stud at one end that mates with a complimentary threaded recess on the neutron source positioning rodlet assembly. The inner capsule contains a neutron source. The neutron source positioning rodlet assembly and the source capsule assembly are locked together at their interface when the threaded joint is completely tightened. A secondary neutron source material may also be encapsulated within a hollow portion of the neutron source positioning rodlet assembly.