Segmented Nuclear Reactor Shield Wall with Ventilation Doors
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Solution Overview
Problem
Current radiation shield and missile barrier designs around nuclear reactor vessel heads lack adequate ventilation for cooling, leading to prolonged elevated temperatures and increased radiation exposure for maintenance personnel during shutdowns, due to their thickness and weight.
Innovation Solution
A vertically configured shield wall with remotely operable air inlet and outlet doors, incorporating neutron-absorbing panels made of boro-silicate-type concrete, allowing for improved air circulation and reduced weight, enabling faster cooling and safer access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If thick concrete barriers (2-4 feet) are used for neutron shielding and missile protection, then radiation shielding effectiveness is improved, but cooling capability deteriorates and weight increases
Solution Approach 1:
The barrier wall is segmented into modular panels with integrated ventilation openings. These openings are distributed throughout the barrier structure, dividing the cooling function into multiple locations rather than requiring a single large opening, thus maintaining shielding while enabling heat dissipation.
Solution Approach 2:
The barrier incorporates a porous or perforated structure with ventilation openings that allow air flow through the thick concrete walls. This porous approach enables cooling air to penetrate and circulate within the barrier thickness, reducing wall temperatures while preserving the overall shielding mass.
2Object-affected harmful factors
If thick concrete barriers (2-4 feet) are used for neutron shielding and missile protection, then radiation shielding effectiveness is improved, but handling ease deteriorates
Solution Approach 1:
The barrier is divided into smaller, manageable panels that can be individually handled, moved, and installed. Each panel maintains the required shielding thickness but reduces the overall size and weight that must be manipulated during maintenance operations, improving handling ease.
Solution Approach 2:
The barrier panels are designed with movable components such as hinged sections or removable covers that allow dynamic access to the reactor vessel head. This enables maintenance personnel to open and close sections as needed rather than moving entire rigid structures.
3Object-affected harmful factors
If confined space within barriers is used for structural integrity, then shielding effectiveness is improved, but cooling capability deteriorates
Solution Approach 1:
Air acts as an intermediary cooling medium that flows through the confined space within the barriers. The ventilation system introduces cooling air into the enclosed barrier cavity, allowing heat to be transferred from the hot inner surfaces to the moving air, which then exhausts to the environment.
Solution Approach 2:
A forced ventilation system using fans or blowers creates pneumatic flow through the barrier cavities. This controlled air movement enhances convective heat transfer from the barrier walls, effectively removing heat from the confined spaces without compromising structural integrity.
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
Enhances air circulation within the radiation barriers, reducing wall temperatures for safe personnel access and lightening the barriers for easier handling, thereby minimizing radiation exposure and improving maintenance efficiency.
Implementation Method 1
enabling cooling air flow along an interior of the shield wall
Implementation Method 2
allowing for improved air circulation and reduced weight, enabling faster cooling
Data Source
AI summary
A pressurized water reactor nuclear containment radiation shield which surrounds the upper portion of a pressure vessel in an ice condenser containment. The vertical walls of the neutron shield are formed in vertical sections with the lower and upper sections operable during outages, to open to promote air flow cooling along the walls in the vicinity of the vessel head.