Floating Nuclear Reactor Tank Seismic Protection
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Solution Overview
Problem
Existing floating nuclear reactors face challenges in withstanding earthquakes without cracking or fracturing, which could lead to radioactive contamination if the tank's bottom or walls leak.
Innovation Solution
A concrete tank design with a flexible bottom wall and side walls, incorporating layers of concrete and water-impermeable materials like rubber, and offset joints to absorb seismic forces and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a concrete tank is used to contain the floating nuclear reactor, then the tank provides structural strength and containment, but the tank is prone to cracking or fracturing during earthquakes
Solution Approach 1:
The tank bottom wall is divided into multiple concrete layers (first concrete layer, second concrete layer, third concrete layer) separated by water-impermeable flexible materials. This segmentation allows each layer to independently accommodate seismic movements while maintaining overall structural integrity and preventing leakage.
Solution Approach 2:
The tank bottom wall employs a composite structure combining rigid concrete layers with flexible water-impermeable materials (such as rubber). This composite design provides both the structural strength needed for containment and the flexibility required to withstand earthquake forces without cracking.
2Stability of the object's composition
If rigid concrete walls are used for the tank, then the walls provide structural integrity, but the walls may leak during seismic events due to lack of flexibility
Solution Approach 1:
Water-impermeable flexible materials (such as rubber layers) are integrated into the tank walls and bottom. These flexible components can deform during earthquakes to accommodate structural movements while maintaining water containment, preventing leakage that would occur with purely rigid concrete construction.
Solution Approach 2:
The tank structure transitions from a single-dimensional rigid concrete wall to a multi-layered composite structure with flexible intermediate layers. This dimensional complexity allows the wall to accommodate three-dimensional seismic deformations while maintaining integrity and preventing leakage.
3Adaptability or versatility
If offset joints are incorporated in the tank walls, then the joints improve flexibility during earthquakes, but the joints may create potential leakage paths
Solution Approach 1:
Offset joints are filled with water-impermeable flexible materials that combine the sealing properties needed to prevent leakage with the flexibility required to accommodate seismic movements. This composite filling material resolves the contradiction between joint flexibility and leakage prevention.
Data Source
AI summary
A nuclear reactor is positioned on a barge which floats on the water of a water tank. The water tank includes a bottom wall, first and second end walls and first and second side walls. The bottom wall includes a lower layer of concrete, an intermediate layer of water impervious material positioned on the lower layer of concrete, and an upper layer of concrete positioned on the intermediate layer of water impervious material. Each of the first and second end walls and the first and second side walls includes an outer layer of concrete, an intermediate layer of water impervious material positioned at the inner side of the outer layer of concrete, and an inner layer of concrete material positioned at the inner side of the intermediate layer of water impervious material.