Jet Pump Plug Device for BWR Recirculation Loop Isolation
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Solution Overview
Problem
Current BWR technology vessels lack a single, efficient solution for both channeling and plugging functions in recirculation loops, with existing plugs having different drawbacks such as varying pitch diameters and requiring multiple sub-assemblies.
Innovation Solution
A single-part device with two covers, each carrying plugs, that adjusts flow rates by sealing or channeling nozzles of jet pumps, using mechanical or pneumatic means for alignment and actuation, allowing for both blind and channeled plug functions with a larger pitch diameter of 1 inch, enabling isolation and decontamination control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple sub-assemblies are used for plugging and channeling functions, then functional versatility is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple sub-assemblies (blind plugs, channeled plugs, positioning elements, actuation mechanisms) into a single integrated plug device. The device includes a body with internal channels that can selectively seal or channel nozzle outlets, eliminating the need for separate components while maintaining all required functions.
Solution Approach 2:
The single plug device performs multiple functions: it can seal all nozzle outlets (blind plug mode), seal specific outlets while channeling others (selective plugging mode), and provide positioning and actuation mechanisms. This multi-functional design replaces multiple specialized components with one universal device.
2Reliability
If a larger pitch diameter of 1 inch is used, then sealing effectiveness is improved, but manufacturing complexity increases
Solution Approach 1:
The plug body is segmented into multiple sections with internal channels that correspond to individual nozzle outlets. Each section can be independently configured to seal or channel, allowing the larger 1-inch pitch diameter to be managed through modular internal structure rather than a monolithic complex design.
3Manufacturing precision
If precise alignment mechanisms are added, then sealing precision is improved, but device complexity increases
Solution Approach 1:
The plug device includes pre-configured positioning elements and alignment features that are built into the device structure before installation. These elements automatically align the plug with the nozzle outlets during insertion, eliminating the need for complex external alignment mechanisms while ensuring precise sealing.
Data Source
AI summary
The invention relates to a plug device for jet pumps installed in nuclear power plant vessels, which comprises two covers (1-2) that form two independent plug units, one fitted on the even pump, which incorporates two plugs (6), and the other on the odd pump of each jet pump assembly, which incorporates three plugs (6), both mounted on a common base (3) at the end of respective arms (4), articulated in the central area, which are actuated by mechanical or hydropneumatic means. The plugs may be blind, in which case they are used to seal the five outlets of the nozzle of the jet pump, or channeled, being used to close the decontamination circuit of the recirculation loops, preventing the cleaning solution from being dispersed in the reactor.