Recirculation Sump Screen Foreign Matter Evaluation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
It is challenging to accurately evaluate the amount of foreign matter that passes through recirculation sump screens in a nuclear power plant during a loss-of-coolant accident, as small foreign matter is not filtered out and the distribution to multiple sump screens is difficult to determine due to varying parameters such as pipe break position and damage state.
Innovation Solution
A method involving the acquisition of test data to form a passed foreign matter amount approximate line and envelope, allowing for the calculation of total foreign matter passed through multiple recirculation sump screens without individual evaluation, using a quadratic curve for the approximate line and a primary expression straight line for the envelope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recirculation sump screen is used to filter foreign matter, then large foreign matter is blocked and pumps/pipes are protected, but small foreign matter passes through and cannot be evaluated
Solution Approach 1:
The patent replaces complex individual tracking of foreign matter through multiple screens with a mathematical envelope method. Instead of mechanically tracking each particle's path, the invention uses calculated envelopes based on test data to represent and evaluate total passed foreign matter quantity.
Solution Approach 2:
The patent changes the evaluation parameter from individual foreign matter tracking to aggregate quantity evaluation using envelope curves. By transforming the problem from spatial tracking to quantitative assessment, the invention enables evaluation of small foreign matter that passes through screens.
2Reliability
If multiple refueling water storage pits are provided, then cooling capacity is increased, but it becomes difficult to determine foreign matter distribution to each screen
Solution Approach 1:
The patent merges the evaluation of multiple recirculation sump screens into a single aggregate evaluation. Instead of analyzing each screen separately, the invention combines their foreign matter passage characteristics into one envelope representation, simplifying the complex multi-screen evaluation problem.
Solution Approach 2:
The patent creates a universal evaluation method that applies to any number of recirculation sump screens. The envelope technique provides a general solution that can evaluate foreign matter passage through multiple screens simultaneously, regardless of the specific configuration or number of screens involved.
3Measurement precision
If individual evaluation of foreign matter reaching each screen is performed, then accurate distribution is obtained, but calculation complexity increases significantly
Solution Approach 1:
The patent extracts the essential evaluation information from complex individual screen analyses. By taking out only the necessary aggregate data and representing it through envelope curves, the invention eliminates unnecessary calculation complexity while retaining the essential evaluation capability.
Data Source
AI summary
Acquiring sets of test data on amounts of foreign matter passed through a recirculation sump screen when different amounts of foreign matter are input; forming a passed foreign matter amount approximate line that approximates the amounts of passed foreign matter with respect to the amounts of input foreign matter on the basis of the sets of test data on the amounts of passed foreign matter; forming a passed foreign matter amount envelope tangent to the passed foreign matter amount approximate line; and estimating a total passed foreign matter amount with respect to the amounts of input foreign matter on the basis of the passed foreign matter amount envelope to evaluate the recirculation sump screen are provided.