Nuclear Reactor Vessel Support Structure Using Mechanical Fastening
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Solution Overview
Problem
Conventional nuclear reactor vessel support structures experience thermal distortion due to welding, leading to precision installation issues and potential deformation during earthquakes.
Innovation Solution
A nuclear reactor vessel support structure utilizing an inner and outer tube-shaped steel plate with an intermediate plate, supported by concrete and bar members, allowing for secure affixation without welding, thereby resisting vertical and horizontal loads and preventing thermal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the support is welded to the structure, then the support is securely affixed to the structure, but thermal distortion occurs at the bonded portion causing installation precision issues
Solution Approach 1:
The invention extracts the harmful welding process from the affixation method and replaces it with mechanical connection using connection parts that engage with recesses in the support. This eliminates thermal distortion while maintaining secure affixation strength.
Solution Approach 2:
The invention introduces connection parts as an intermediary element between the support and the structure. These connection parts mechanically engage with recesses in the support and connect to the structure, providing secure affixation without direct welding to the support, thus preventing thermal distortion.
2Stability of the object's composition
If the support is welded to the structure, then the support is integrally formed with the structure, but the support may be deformed during earthquakes due to thermal distortion
Solution Approach 1:
The invention removes the welding process that causes thermal distortion and replaces it with mechanical connection through connection parts. This maintains the integral formation stability while preventing deformation during earthquakes by eliminating the weakened zone created by welding.
Solution Approach 2:
The connection parts serve as intermediaries that provide a robust mechanical connection between the support and structure without the thermal effects of welding. This ensures the support remains integrally formed with the structure while maintaining strength and resistance to earthquake-induced deformation.
3Reliability
If welding is used to affix the support, then the support is securely attached, but the nuclear reactor vessel cannot be installed with high precision
Solution Approach 1:
The invention extracts the welding operation from the attachment process and replaces it with mechanical connection using connection parts that engage with precision-machined recesses in the support. This maintains attachment reliability while enabling high-precision installation of the nuclear reactor vessel.
Solution Approach 2:
The connection parts act as intermediaries that provide reliable mechanical attachment while allowing for precise positioning. The recesses in the support and corresponding engagement features in the connection parts enable high-precision alignment and installation of the nuclear reactor vessel while maintaining secure attachment.
Data Source
AI summary
A nuclear reactor vessel structure includes an inner peripheral tube-shaped steel plate, an outer peripheral tube-shaped steel plate, and an intermediate tube-shaped steel plate disposed between the inner and outer peripheral tube-shaped steel plates, and is configured to support a nuclear reactor vessel on the inner peripheral side of a tube-shaped structure with concrete placed between the steel plates. The nuclear reactor vessel structure includes a support having a tube-shaped plate disposed on the inner peripheral side of the intermediate tube-shaped steel plate, and an annular plate which protrudes to the inner peripheral side of the tube-shaped plate and to which a connection section is affixed. The support is affixed to the concrete, which is placed between the inner peripheral and the intermediate tube-shaped steel plates, by first bar members, and the support is also affixed to the inner peripheral tube-shaped steel plate by second bar members.