Oval Protective Superstructure for Nuclear Plant Flood and Impact Resistance
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Solution Overview
Problem
Nuclear power plants located near bodies of water face challenges in mitigating flood risks from extreme events like tsunamis and storm surges, while also needing to withstand potential aircraft or land vehicle impacts, as conventional coastal defenses can be overwhelmed by severe events and may not provide adequate impact resistance.
Innovation Solution
A protective superstructure with an oval-shaped plan profile, featuring a greater curvature at one end region than the other, is designed to reduce pressure differentials during flooding events, combined with a berm that diverts water and provides structural integrity, including reinforced concrete for aircraft impact resistance and lighter materials for other regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional coastal defences such as seawalls are installed to prevent flooding, then flood protection is improved, but the defences can be quickly overwhelmed by extreme events
Solution Approach 1:
The protective superstructure is nested within the existing plant layout, with the oval-shaped structure containing the turbine hall, cooling water pump house, and containment structure. This nested configuration allows the superstructure to provide enhanced flood protection without requiring complete replacement of existing defenses, addressing the limitation of conventional seawalls being overwhelmed by extreme events.
Solution Approach 2:
The protective superstructure employs an oval-shaped plan profile with specific curvature characteristics. The greater degree of curvature at the first end region compared to the second end region is specifically designed to reduce pressure differentials during flooding events, thereby preventing overwhelming by extreme waves while maintaining structural integrity.
2Strength
If reinforced concrete is used throughout the superstructure to provide impact resistance, then aircraft and land vehicle strike protection is improved, but structural weight and material costs increase
Solution Approach 1:
The superstructure employs differentiated material specifications based on local risk requirements. Reinforced concrete is applied selectively to regions requiring maximum impact resistance (such as the first end region facing aircraft strike risk) while lighter materials are used in regions with lower threat levels, thereby reducing overall weight and material costs while maintaining adequate protection.
Solution Approach 2:
The oval-shaped plan profile features asymmetric curvature distribution with a greater degree of curvature at the first end region than at the second end region. This asymmetric design optimizes both flood protection performance and impact resistance distribution, allowing for more efficient material usage compared to symmetric designs.
3Reliability
If the superstructure is designed to withstand extreme flood events, then flood mitigation is improved, but the complexity of the protective structure increases
Solution Approach 1:
The protective superstructure is designed as a multi-functional element that simultaneously provides flood protection, impact resistance from aircraft and land vehicles, and structural support for the turbine hall, cooling water pump house, and containment structure. This universal design reduces overall system complexity compared to separate specialized defenses for each threat type.
Solution Approach 2:
The oval-shaped plan profile with specific curvature characteristics provides a streamlined configuration that reduces pressure differentials during flooding events while maintaining structural strength. This geometric design achieves effective flood mitigation without requiring complex additional protective elements.
Data Source
AI summary
A nuclear power plant having a protective superstructure including a first end region configured to cover a nuclear reactor in a containment structure, a second end region opposite the first end region and configured to cover a cooling water pump house, and a central region between the first and second end regions and configured to cover a turbine hall. The superstructure has an oval-shaped plan profile, the oval having a greater degree of curvature at the first end region than at the second end region.