Nuclear Reactor Containment Zone Partitioning
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Solution Overview
Problem
Current nuclear reactor containment designs face challenges in managing severe ambient conditions of pressure, temperature, and humidity during reactor coolant system breaches, which can compromise the reliability and maintenance of safety systems and instrumentation in high-pressure containment environments.
Innovation Solution
A novel containment design featuring two or more separate zones, with a partition plate extending from the containment envelope to the reactor coolant system, ensuring that leaks or breaks remain confined within one zone, preventing adverse conditions from propagating to other zones, thus allowing for flexible equipment placement and improved maintenance access without compromising high-pressure containment benefits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-pressure containment is used to contain radioactivity release during reactor coolant system breaches, then containment effectiveness is improved, but maintenance access and operational flexibility of safety systems deteriorate due to severe ambient conditions
Solution Approach 1:
The containment building is divided into multiple separate zones (e.g., drywell and wetwell, or multiple containment cells) that are isolated from each other by partition walls. This segmentation allows a breach in one zone to be contained within that zone only, preventing propagation of severe conditions to other zones. Safety systems and instrumentation can be strategically placed in zones that remain under normal conditions, ensuring maintenance access and operational flexibility while maintaining overall containment effectiveness.
2Reliability
If high-pressure containment is used to maintain containment pressure during breaches, then radioactivity containment is improved, but temperature and humidity conditions become severe affecting equipment reliability
Solution Approach 1:
The containment is segmented into multiple isolated zones with partition walls. When a breach occurs in one zone, the high pressure, temperature, and humidity conditions are confined to that specific zone only. Other zones remain under normal atmospheric conditions, allowing safety systems and equipment to operate reliably without being exposed to severe thermal and humidity effects.
Solution Approach 2:
Partition walls and isolation barriers act as intermediaries between different containment zones. These barriers prevent the direct propagation of severe thermal and humidity conditions from the breach zone to other zones, effectively mediating the harmful effects and protecting equipment in unaffected zones.
3Device complexity
If a single-zone containment design is used, then structural simplicity is maintained, but propagation of adverse conditions throughout the containment building occurs
Solution Approach 1:
The containment building is divided into multiple separate zones (e.g., drywell and wetwell, or multiple containment cells) that are isolated from each other by partition walls. This segmentation limits the propagation of adverse conditions such as high pressure, temperature, and humidity to only the specific zone where a breach occurs, preventing widespread contamination throughout the entire containment building.
Data Source
AI summary
A containment for a water cooled and moderated nuclear reactor incorporates two or more separate containment zones. These zones are constructed in such a manner that a leak or break in the reactor coolant system located within one zone will remain confined within this particular zone, so that no adverse ambient conditions of pressure, temperature, and humidity will propagate to any of the other zones. The separation between zones is achieved by having a partition plate extending between the containment envelope and the reactor coolant system where the partition plate is attached to one of the main components of the reactor coolant system. For example, this can be the reactor pressure vessel, as shown in some of the embodiments. The partition is designed to the same pressure and temperature conditions as the containment vessel envelope to ensure a leak tight and permanent separation between adjacent zones.