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Online measuring method for burn-up level of fuel element of sphere type modular high-temperature gas-cooling reactor

A technology of high-temperature gas-cooled reactors and fuel elements, which is applied in the fields of reducing greenhouse gases, reactors, and nuclear reactor monitoring, and can solve problems such as difficult to meet timely and accurate basic requirements

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Problems solved by technology

Such methods may require additional 252 Cf neutron sources, or fission products 244 The number of neutrons emitted by Cm is small; in addition, in the case of low uranium enrichment of individual fuel elements, too large error will be introduced; meanwhile, only when the cooling time is greater than 1.5 years, 244 Cm becomes the main neutron emitter
Therefore, it is difficult for this type of method to meet the basic requirements of timely and accurate

Method used

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  • Online measuring method for burn-up level of fuel element of sphere type modular high-temperature gas-cooling reactor
  • Online measuring method for burn-up level of fuel element of sphere type modular high-temperature gas-cooling reactor
  • Online measuring method for burn-up level of fuel element of sphere type modular high-temperature gas-cooling reactor

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Experimental program
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Embodiment Construction

[0104] In order to realize the above-mentioned burnup depth measurement process, the FCA system of HTR-10 is equipped with three core system equipments: high-purity germanium gamma energy spectrometer, tungsten collimator, and programmable controller (OMRON C200HS):

[0105] (1) High-purity germanium gamma energy spectrometer: fission products emit relatively 137 The γ-rays that are nearly a hundred times stronger than Cs have extremely complex components, and some γ-rays have the same energy as 137 The Cs spectral lines are very close, so this method adopts a high-resolution high-purity germanium gamma energy spectrometer to separate 137 The gamma line of Cs. The relevant parameters are designed as follows:

[0106] i) Detector

[0107] P-type high-purity germanium detector, placed vertically, allowing temperature cycle, detection efficiency 19-20%, energy range for gamma-ray detection: 40KeV-10MeV;

[0108] Energy resolution: 1.8KeV~1.75KeV for γ of 1.33MeV;

[0109] Ga...

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Abstract

The related testing technique for nuclear reactor comprises: the upper machine starts up burn-up level measuring program; the fuel element is radiated and cooled; the PLC controls to send the element to lift position with same axis as the collimator and then notify the upper machine for measurement; the high-pure gamma-spectrometer measures the count of 0.661642MeV gamma radioactive ray emitted by 137Cs during decay, and calculates counting rate for the ray to determine whether takes out the core or returns to original core for work, and it sends the measured result to the main control system through a PLC. This invention is not to contact.

Description

technical field [0001] The invention is used for the burnup depth measurement method of the fuel elements in the pebble bed type modular high-temperature gas-cooled reactor, and particularly relates to the technical field of on-line measurement. Background technique [0002] Modular high-temperature gas-cooled reactor (MHTGR) is a reactor type recognized by the international nuclear energy community as having good safety. Its research and development work began in the 1970s. Unlike gas-cooled reactors, modular high-temperature gas-cooled reactors use ceramic-coated pellet fuel. Helium is used as coolant. Helium is an inert gas with good chemical stability, no phase change, and good cooling performance, so the outlet temperature of MHTGR coolant can be very high. [0003] The pebble bed modular high temperature gas-cooled reactor (PBMHTGR) adopts the fuel management method of non-stop continuous loading and unloading, which utilizes the rolling characteristics of spherical f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/06
CPCY02E30/30
Inventor 马涛胡守印梁锡华黄鹏
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