Method and apparatus for evaluating a proposed solution to a constraint problem for a nuclear reactor involving channel deformation

• US 8,041,548 B2
• Filed: 12/30/2004
• Issued: 10/18/2011
• Est. Priority Date: 12/30/2004
• Status: Active Grant

• Current Assignee: Global Nuclear Fuel Americas, LLC (General Electric Company)
• Original Assignee: Global Nuclear Fuel Americas, LLC (General Electric Company)
• Inventors: Moore, Brian, Karve, Atul Arun, Chopelas, Angelo Peter, Kropaczek, David Joseph
• Primary Examiner(s): Shah; Kamini S
• Assistant Examiner(s): Saxena; Akash
• Application Number:
  US11/024,433
• Publication Number:
  US 20060149512A1
• Time in Patent Office: 2,483 Days
• Field of Search: 376/245, 376/327, 376332-335, 703/2, 703/6, 700/28
• US Class Current: 703/6
• CPC Class Codes: G06F 2111/04 Constraint-based CAD
• CPC Class Codes: G06F 30/00 Computer-aided design [CAD]

Abstract

A method of and a system for evaluating constraint functions for improving nuclear reactor performance involve generating an operational solution for a nuclear reactor using a constraint to account for a problem with the operation of the nuclear reactor. The problem is based at least in part on channel deformation criteria.

Claims

1. A method of evaluating proposed solutions to a nuclear reactor constraint problem, comprising:

providing an objective function definition generic to a constraint problem,

configuring the generic objective function into a nuclear reactor constraint problem objective function having channel deformation of control blades as a constraint,

the nuclear reactor constraint problem objective function being a sum of optimization parameters and constraint parameters,

each optimization parameter including a multiple of a credit term and an associated credit weight, the credit term being a numerical value associated with the optimization parameter, the credit weight being a numerical value corresponding to a relative importance of the associated credit term,

each constraint parameter including a multiple of a penalty term and an associated penalty weight, the penalty term being a numerical value associated with a violation of a constraint, at least one penalty term including a summation of a number of control blades affected by the channel deformation, the penalty weight being a numerical value corresponding to a relative importance of the associated penalty term, at least one penalty weight being a numerical value corresponding to a relative importance of the control blades affected by the channel deformation, the channel deformation being at least one of bowing, bulging and twisting of a channel,

the channel having walls surrounding a fuel bundle;

receiving, for each proposed solution to the nuclear reactor constraint problem, a value of at least one variable in at least one credit term in the configured objective function at the processor, the credit term variable being related to the proposed solution;

receiving, for each proposed solution to the nuclear reactor constraint problem, a value of at least one variable in at least one penalty term in the configured objective function at the processor, the penalty term variable being related to the proposed solution;

generating, using the processor, a figure of merit for each of the proposed solutions to the nuclear reactor constraint problem based on the credit term variable and the penalty term variable using the configured objective function; and

determining a desired one of the proposed solutions to the nuclear reactor constraint problem based on the generated figures of merit.

2. The method of claim 1, further comprising:

implementing the desired proposed solution to the nuclear reactor constraint problem, based on the evaluation, in order to optimize performance of the nuclear reactor, the determining the desired one of the proposed solutions being accomplished by using the figures of merit to evaluate the relative strength of the proposed solutions.

3. A method of evaluating proposed solutions to a nuclear reactor constraint problem, comprising:

providing an objective function definition generic to a constraint problem,

configuring the generic objective function into an application specific objective function having channel deformation of control blades as a constraint,

the application specific objective function being a sum of optimization parameters and constraint parameters

each optimization parameter including a multiple of a credit term and an associated credit weight, the credit term being a numerical value associated with the optimization parameter, the credit weight being a numerical value corresponding to a relative importance of the associated credit term,

each constraint parameter including a multiple of a penalty term and an associated penalty weight, the penalty term being a numerical value associated with a violation of a constraint, at least one penalty term including a summation of a number of control blades affected by the channel deformation, the penalty weight being a numerical value corresponding to a relative importance of the associated penalty term, at least one penalty weight being a numerical value corresponding to a relative importance of the control blades affected by the channel deformation, the channel deformation being at least one of bowing, bulging and twisting of a channel, the channel having walls surrounding a fuel bundle;

generating, using the processor, a figure of merit for each of the proposed solutions to the nuclear reactor constraint problem based on the credit term variable and the penalty term variable using the application specific objective function; and

determining a desired one of the proposed solutions to the nuclear reactor constraint problem based on the generated figure of merit.

4. The method of claim 3, further comprising:

implementing the desired proposed solution to the nuclear reactor constraint problem, based on the evaluation in order, to optimize performance of the nuclear reactor, the determining the desired one of the proposed solutions being accomplished by using the figures of merit to evaluate the relative strength of the proposed solutions.

5. An apparatus for evaluating proposed solutions to a nuclear reactor constraint problem, comprising:

a memory storing an application specific objective function configured based on a generic objective function definition generic to a constraint problem,

the application specific objective function having channel deformation of control blades as a constraint,

the application specific objective function definition being a sum of optimization parameters and constraint terms,

each optimization parameter including a multiple of a credit term and an associated credit weight, the credit term being a numerical value associated with the optimization parameter, the credit weight being a numerical value corresponding to a relative importance of the associated credit term,

each constraint parameter including a multiple of a penalty term and an associated penalty weight, the penalty term being a numerical value associated with a violation of a constraint, at least one penalty term including a summation of a number of control blades affected by the channel deformation, the penalty weight being a numerical value corresponding to a relative importance of the associated penalty term, at least one penalty weight being a numerical value corresponding to a relative importance of the control blades affected by the channel deformation based on criteria for channel deformation,

the channel deformation being at least one of bowing, bulging and twisting of a channel, the channel having walls surrounding a fuel bundle;

an interface receiving, for each proposed solution to the nuclear reactor constraint problem, a value of at least one variable in at least one credit term of the application specific objective function and receiving a value of at least one variable in at least one penalty term of the application specific objective function, the credit term variable and the penalty term variable being related to the proposed solution; and

a processor generating a figure of merit for each of the proposed solutions to the nuclear reactor constraint problem based on the credit term variable and the penalty term variable using the application specific objective function, the processor configured to determine a desired one of the proposed solutions to the nuclear reactor constraint problem based on the generated figures of merit.

6. The apparatus of claim 5, wherein the processor is further configured to implement the desired proposed solution to the nuclear reactor constraint problem, based on the evaluation, in order to optimize performance of the nuclear reactor, the processor configured to determine the desired one of the proposed solutions by using the figures of merit to evaluate the relative strength of the proposed solutions.

7. A method of generating a solution to an optimization problem, comprising:

generating, using a processor, candidate solutions to a nuclear reactor constraint problem;

generating, using the processor, objective function values using a configured objective function, the configured objective function being configured from an objective function definition generic to the constraint problem,

the configured objective function having channel deformation of control blades as a constraint,

the configured objective function being a sum of optimization parameters and constraint parameters,

each optimization parameter including a multiple of a credit term and an associated credit weight, the credit term being a numerical value associated with the optimization parameter, the credit weight being a numerical value corresponding to a relative importance of associated credit terms,

each constraint parameter including a multiple of a penalty term and an associated penalty weight, the penalty term being a numerical value associated with a violation of a constraint, at least one penalty term including a summation of a number of control blades affected by the channel deformation, the penalty weight being a numerical value corresponding to a relative importance of the associated penalty term, at least one penalty weight being a numerical value corresponding to a relative importance of the control blades affected by the channel deformation,

the channel deformation being at least one of bowing, bulging and twisting of a channel, the channel having walls surrounding a fuel bundle; and

assessing convergence on a desired solution to the nuclear reactor constraint problem based on the objective function values.

8. The method of claim 7, further comprising:

implementing the desired solution, based on the assessment, if the objective function value is acceptable, the assessing the convergence on the desired solution including determining a strength of the candidate solutions by evaluating the objective function values.

9. A method of configuring an objective function and implementing proposed solution, the method automated by a processor, comprising:

providing an objective function configured for a constraint problem,

the objective function being a sum of optimization parameters and constraint parameters,

each optimization parameter including a multiple of a credit term and an associated credit weight, the credit term being a numerical value associated with the optimization parameter, the credit weight being a numerical value corresponding to a relative importance of the associated credit term,

each constraint parameter including a multiple of a penalty term and an associated penalty weight, the penalty term being a numerical value associated with a violation of a constraint, at least one penalty term including a summation of a number of control blades affected by the channel deformation, the penalty weight being a numerical value corresponding to a relative importance of the associated penalty term, at least one penalty weight being a numerical value corresponding to a relative importance of the control blades affected by the channel deformation;

defining the credit terms based on user input,

the channel deformation being at least one of bowing, bulging and twisting of a channel, the channel having walls surrounding a fuel bundle;

generating a merit based on the credit term and penalty term using the objective function; and

implementing a proposed solution, if the figure of merit is acceptable.