Method of calibrating excore detectors in a nuclear reactor

A technology of detectors and pressurized water reactors, applied in the field of nuclear reactors, can solve the problems of lack of multifunctionality and limited reactor utility

Active Publication Date: 2013-01-02
WESTINGHOUSE ELECTRIC CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This lack of versatility in plant operation limits the utility of the reactor and requires non-nuclear power plants to sustain the capacity differential needed for load changes

Method used

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  • Method of calibrating excore detectors in a nuclear reactor
  • Method of calibrating excore detectors in a nuclear reactor
  • Method of calibrating excore detectors in a nuclear reactor

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Embodiment Construction

[0023] For purposes of illustration, embodiments of the disclosed concepts will be described as applied to calibrating a detector system located in the core with an active core and employing the Best Estimate Analysis for Core Operations-Nuclear (BEACON TM ) core monitoring systems in pressurized water nuclear reactors (PWR), but it should be clear that they can also be applied to core monitoring systems other than BEACON and have moving in-core detector systems, fixed core PWR for an in-core detector system, or a combination of a movable in-core detector system and a fixed in-core detector system.

[0024]As used herein, the term "nuclear data" refers to information and parameters representative of the fuel assemblies and combustible absorbers located in the nuclear core, and specifically includes, but is not limited to, neutron flux, power, burnup, inlet temperature , outlet temperature, enthalpy, axial offset, and combinations thereof.

[0025] As used herein, the phrase "...

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Abstract

A method of calibrating excore detectors for a pressurized water reactor (PWR) (1) includes: measuring peripheral core flux signals using excore detectors (33) disposed at a plurality of locations spaced about the periphery of the core (9), and using the measured power distribution from either a core monitoring system (43) or in-core flux measurement (69). Calibration of the excore detectors (33) is broken into two parts: (1) the relation between the excore detector signal and weighted peripheral assembly axial offset, and (2) the relation between weighted peripheral assembly axial offset and core average axial offset. Relation (2) can be determined by a representative neutronics model. Accuracy of the neutronics solution is improved by applying (83) nodal calibration factors, which represent the ratio of the measured three-dimensional power distribution (75) to the nodal predicted three- dimensional power distribution and correct the neutronic results to match what would be measured if predictive scenarios were actually performed in the actual reactor core (9).

Description

technical field [0001] The disclosed concept relates generally to nuclear reactors and, more particularly, to methods of calibrating excore power range detectors located in nuclear reactors, such as pressurized water reactors (PWRs). Background technique [0002] The core of a modern commercial nuclear power reactor is formed from multiple elongated fuel assemblies mounted within a vertical reactor vessel. A pressurized coolant is circulated through the fuel assemblies to absorb heat generated by nuclear reactions in the fission fuel contained in the assemblies. The distribution of power through the core is affected by several factors, such as how well the control rods are inserted into the fuel assemblies. Accurate determination of power distribution is important to ensure that reactor operating limits are not exceeded. [0003] As an example, one system that has been developed for determining the power distribution in a pressurized water reactor (PWR) is Best Estimate An...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/108
CPCG21C17/108G21D3/001G21D3/08Y02E30/00Y02E30/30
Inventor D·J·克里格
Owner WESTINGHOUSE ELECTRIC CORP
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