Ventilated Transfer Cask Venting and Dual-Lid Shielding
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Solution Overview
Problem
Current systems for storing and handling high-level radioactive waste, such as spent nuclear fuel, face challenges including radiation exposure risks for personnel, inefficient heat dissipation due to wind effects, high maintenance costs, and the need for periodic leak testing that increases radiation exposure and maintenance requirements.
Innovation Solution
A ventilated overpack system with a cylindrical design featuring a bottom air inlet vent that extends around the circumference and a top air outlet vent, along with a dual-lid system for improved radiation shielding and reduced exposure, and a method for leak testing using a hermetically sealed vessel with a test port and conduit for detecting leaks without exposing workers to radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single lid system is used for radiation shielding, then the structure is simpler, but radiation exposure risks increase for personnel
Solution Approach 1:
The lid system is divided into two separate lids: a primary lid that provides radiation shielding and a secondary lid that provides additional protection and sealing. This segmentation allows each lid to be optimized for its specific function while collectively reducing radiation exposure risks for personnel during waste transfer operations
2Temperature
If conventional ventilation systems are used, then heat dissipation is provided, but wind effects reduce efficiency
Solution Approach 1:
The overpack adopts a cylindrical (spheroidal) geometry with curved surfaces that promote uniform airflow patterns and reduce turbulent wind effects. This curved geometry enhances natural convection currents for heat dissipation while minimizing the impact of external wind disturbances on ventilation efficiency
3Reliability
If periodic leak testing is performed manually, then leak detection is achieved, but maintenance costs and radiation exposure increase
Solution Approach 1:
The overpack incorporates integrated sensors and monitoring systems that automatically detect leaks and provide continuous status monitoring without requiring manual intervention. This self-service capability enables continuous reliability monitoring while eliminating the need for periodic manual leak testing, thereby reducing both maintenance costs and radiation exposure to personnel
4Object-affected harmful factors
If thick shielding materials are used, then radiation shielding is improved, but weight and device complexity increase
Solution Approach 1:
The overpack utilizes composite shielding materials that combine multiple materials with complementary properties to achieve effective radiation attenuation. This composite approach provides adequate radiation protection while optimizing the weight-to-shielding-performance ratio, avoiding the excessive weight that would result from using only thick single-material shielding
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
The system reduces radiation exposure risks, enhances heat dissipation performance, minimizes maintenance needs, and improves leak detection capabilities while maintaining effective radiation shielding and efficient waste transfer.
Implementation Method 1
A ventilated overpack system with a cylindrical design featuring a bottom air inlet vent that extends around the circumference and a top air outlet vent
Implementation Method 2
a method for leak testing using a hermetically sealed vessel with a test port and conduit for detecting leaks without exposing workers to radiation
Data Source
AI summary
A method of forming a sealed canister and a method of storing radioactive materials is provided. The method of forming includes placing a top plate on a top opening of a side wall, a bottom of the side wall being sealed to a base plate. The top plate includes a top surface with a top edge having a bevel and with a channel set in from the top edge. Finally, a weld is formed between the beveled top edge and the top opening of the side wall to seal the top plate to the side wall.