Neutron Monitoring Systems Including Gamma Thermometers And Methods Of Calibrating Nuclear Instruments Using Gamma Thermometers
a technology of neutron monitoring system and gamma thermometer, which is applied in the direction of instruments, nuclear elements, greenhouse gas reduction, etc., can solve the problems of lprm detector reading corresponding to a constant thermal neutron flux gradually decreasing, and lprm detector reading corresponding to a constant thermal neutron flux may still gradually decrease over time, etc., to achieve the effect of not including the calibration of nuclear instruments in nuclear reactors
Inactive Publication Date: 2013-01-10
MOEN STEPHAN CRAIG +3
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Benefits of technology
This approach allows for precise and cost-effective calibration of nuclear instruments, even when the reactor is not in steady-state, by compensating for delayed gamma sources, thereby improving the accuracy and efficiency of neutron monitoring systems.
Problems solved by technology
But due to the extremely high thermal neutron flux in the nuclear reactor core, the U235 may be subject to burnout, which may cause the LPRM detector reading corresponding to a constant thermal neutron flux to gradually decrease over time.
Eventually, however, the LPRM detector reading corresponding to a constant thermal neutron flux may still gradually decrease over time.
However, these various solutions do not include calibrating nuclear instruments in nuclear reactors—using gamma thermometers—wherein the calibrating of the nuclear instruments may be performed simply, automatically, in real-time, and / or with reduced cost when the associated nuclear reactor is not in steady-state operation.
Method used
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[0088]Example embodiments will now be described more fully with reference to the accompanying drawings. Embodiments, however, may be embodied in many different forms and should not be construed as being limited to the example embodiments set forth herein. Rather, these example embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope to those skilled in the art.
[0089]It will be understood that when a component is referred to as being “on,”“connected to,”“coupled to,” or “fixed to” another component, it may be directly on, connected to, coupled to, or fixed to the other component or intervening components may be present. In contrast, when a component is referred to as being “directly on,”“directly connected to,”“directly coupled to,” or “directly fixed to” another component, there are no intervening components present. As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items...
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A neutron monitoring system uses a gamma thermometer to calibrate a nuclear instrument to ensure more accurate neutron flux measurements in a nuclear reactor core. The nuclear instrument generates a first signal proportional to a measured local neutron flux. The gamma thermometer generates a second signal proportional to a measured local gamma flux. A processor is used to compensate the second signal by filtering groups of delayed gamma sources to a reduced number of specific groups of delayed gamma sources. A third signal is calculated based upon yield fractions and time constants that are determined for the specific groups of delayed gamma sources. A gain of the nuclear instrument is calibrated based on a compensated second signal that is determined by subtracting the third signal from the second signal.
Description
PRIORITY[0001]This application is a divisional of U.S. application Ser. No. 12 / 557,631 filed Sep. 11, 2009, the entire contents of which is hereby incorporated herein by reference.GOVERNMENT SUPPORT[0002]This invention was made with Government support under contract number DE-FC07-07ID14778, awarded by the U.S. Department of Energy. The United States Government has certain rights in the invention.BACKGROUND[0003]1. Field[0004]Example embodiments relate to neutron monitoring systems including gamma thermometers and methods of calibrating nuclear instruments using gamma thermometers. Also, example embodiments relate to neutron monitoring systems including gamma thermometers in which nuclear instruments of the neutron monitoring systems are calibrated using compensated signals from the gamma thermometers. Additionally, example embodiments relate to methods of calibrating nuclear instruments using compensated signals from the gamma thermometers.[0005]2. Description of Related Art[0006]F...
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IPC IPC(8): G21C17/00
CPCG01T7/005G21C17/108Y02E30/40G21D3/001G21C17/112Y02E30/30Y02E30/00
InventorMOEN, STEPHAN CRAIGMEYERS, CRAIG GLENNPETZEN, JOHN ALEXANDERFOARD, ADAM MUHLING
OwnerMOEN STEPHAN CRAIG