Control Rod Drive Line Thermal Test Device Centering
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Solution Overview
Problem
Existing test devices for control rod drive lines in nuclear power plants fail to meet stringent high-temperature (≥300°C) and high-pressure (≥15MPa) operating conditions, and lack effective centering and alignment mechanisms for the upper core plate, lower core plate, and guide tube support plate during hot state operations.
Innovation Solution
A hot test device with a segmented pressure shell configuration and adjustable baffle, upper plate, and guide tube support plate adjusting members, utilizing stainless steel forgings and metal O-rings for precise centering and alignment, and a pressure block for horizontal adjustment, ensuring accurate positioning and reliability under extreme conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a segmented pressure shell configuration is used to enable disassembly and reassembly for inspection, then the ease of repair and inspection is improved, but the manufacturing precision and alignment accuracy deteriorate
Solution Approach 1:
The pressure shell is divided into multiple detachable segments (first pressure shell, second pressure shell, third pressure shell) that can be separated for inspection and reassembled for operation. This segmentation enables easy disassembly and reassembly while maintaining structural integrity through flange connections.
Solution Approach 2:
Adjusting members with adjustable lengths are used to modify the position parameters of plates (upper core plate, lower core plate, guide tube support plate) during assembly. By changing the length parameter of adjusting members, precise centering and alignment can be achieved after reassembly, compensating for any dimensional variations introduced by segmentation.
2Manufacturing precision
If adjustable members are added to achieve precise centering and alignment under high temperature and pressure, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
Adjustable members with adjustable lengths are incorporated into the structure, allowing dynamic modification of plate positions during assembly. This dynamic adjustment capability enables precise centering and alignment under high temperature and pressure conditions without requiring overly complex fixed structures.
Solution Approach 2:
The adjustable members serve multiple functions: they provide structural support, enable position adjustment for centering, and allow alignment correction. This multi-functionality reduces the need for separate dedicated adjustment mechanisms, thereby limiting the increase in device complexity while achieving precise centering.
3Reliability
If stainless steel forgings and metal O-rings are used to ensure reliability under extreme conditions, then the reliability is improved, but the manufacturing cost increases
Solution Approach 1:
The device employs composite material construction, specifically using stainless steel forgings for the pressure shells and metal O-rings for sealing. This combination of materials provides superior reliability under high temperature and pressure conditions while maintaining manufacturing feasibility through standardized components.
4Ease of operation
If the pressure shell is designed as detachable segments for easy assembly and disassembly, then the ease of operation is improved, but the sealing reliability may deteriorate
Solution Approach 1:
The pressure shell is segmented into detachable sections connected by flanges, enabling easy assembly and disassembly for inspection and maintenance. The segmentation is designed with standardized flange interfaces that maintain sealing integrity when properly assembled.
Solution Approach 2:
Metal O-rings are introduced as intermediary sealing elements between the detachable pressure shell segments. These O-rings serve as mediators that ensure reliable sealing at the joints between segments, preventing leakage while allowing the segments to be easily assembled and disassembled.
Data Source
Figure 1
Figure 2~3
AI summary
A hot test device for a control rod drive line includes a bottom connecting shell (1), a lower pressure shell (2), a middle pressure shell (3), an upper pressure shell (4), a lower core plate (5), a baffle assembly (6), an upper reactor core plate (7), a guide tube support plate (8), a guide tube (9), a tube base installation structure (10) and a tube base (0). An upper plate installation notch (22) and a lower plate installation notch (21) are respectively provided at two ends of the lower pressure shell (2); the lower core plate (5) is fixed onto the lower plate installation notch (21); a plurality of baffle adjusting members (61) arranged in a circumferential direction are provided at a position close to a top of the baffle assembly (6); the upper reactor core plate (1) is fixed onto the upper plate installation notch (22); a plurality of upper plate adjusting members (71) arranged in a circumferential direction are provided at the upper core plate (7); and a plurality of support plate adjusting members (81) arranged in a circumferential direction are provided at the guide tube support plate (8).