Nuclear Fuel Storage Segregation by Heat Rate
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Solution Overview
Problem
Current air-cooled spent fuel storage facilities face challenges in managing the storage and potential reuse of nuclear fuel assemblies due to varying heat generation rates, leading to inefficient storage and disposal processes, as well as the inability to reload spent fuel into reactors.
Innovation Solution
A system and method involving a long-term and interim storage vault system, utilizing thimbles to segregate fuel assemblies based on heat generation rates, with passive cooling for lower heat assemblies and active cooling for higher heat assemblies, allowing for safe storage and potential reinsertion into reactors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If spent fuel is stored in a single facility, then storage simplicity is maintained, but heat management efficiency deteriorates due to varying heat generation rates
Solution Approach 1:
The storage facility is divided into multiple storage areas with different cooling capacities. High-heat fuel assemblies are stored in areas with active cooling systems, while low-heat assemblies are stored in areas with passive air cooling. This segmentation allows each area to be optimized for its specific heat generation rate, improving overall heat management efficiency without requiring complete redesign of the entire facility.
Solution Approach 2:
Different cooling methods are applied to different locations within the storage facility based on the heat generation characteristics of the fuel assemblies stored there. Active cooling (water or forced air) is applied locally to high-heat areas, while passive air cooling is sufficient for low-heat areas. This localized approach to cooling quality optimizes heat management while avoiding unnecessary complexity in low-heat zones.
2Area of stationary object
If spent fuel is permanently disposed of, then storage space is freed, but fuel reuse potential is lost
Solution Approach 1:
The system performs preliminary assessment and classification of fuel assemblies before final disposal decisions. Fuel assemblies are evaluated for their heat generation rates, radiation levels, and potential for reuse. Assemblies that may have future utility are segregated and maintained in storage with appropriate cooling, preserving the option for reuse while allowing immediate disposal of assemblies with no reuse potential, thus optimizing both space utilization and fuel versatility.
Solution Approach 2:
The storage system is designed to be dynamic rather than static, allowing fuel assemblies to be moved between storage areas, reprocessed, or returned to service based on changing needs and technological capabilities. The classification and cooling infrastructure supports both immediate disposal and long-term storage with reuse potential, making the system adaptable to future energy demands and technological advances.
3Ease of operation
If fuel assemblies are stored without classification, then storage operation is simplified, but temperature control precision deteriorates
Solution Approach 1:
Fuel assemblies are classified and tagged with their heat generation characteristics before being placed in storage. This preliminary classification by heat generation rate allows assemblies to be automatically directed to appropriate storage areas with suitable cooling capacities, simplifying ongoing storage operations while ensuring precise temperature control. The initial sorting effort pays dividends in operational simplicity and temperature management precision throughout the storage period.
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
Enables efficient storage of nuclear fuel assemblies for extended periods while maintaining temperature control and ensuring safety, allowing for the reuse of fuel assemblies by segregating heat generation rates, thus addressing the inefficiencies in existing storage and disposal methods.
Implementation Method 1
passive cooling for lower heat assemblies
Implementation Method 2
active cooling for higher heat assemblies
Data Source
AI summary
A method for storing nuclear fuel includes transferring a fuel assembly from a long term storage vault to a nuclear reactor core, removing the fuel assembly from the nuclear reactor core, determining a heat generation rate of the irradiated fuel assembly, and transferring the irradiated fuel assembly to one of an interim storage vault and a long term storage vault based on the determined heat generation rate.