Burn-up measurement system for spent fuel assembly

A measurement system and technology of spent fuel, applied in the fields of nuclear reactor monitoring, reactor, nuclear power generation, etc., can solve the problems of no automatic control mechanical parts, long measurement device length, unsuitable installation and measurement, etc. The effect of a compact measurement system and high measurement accuracy

CN101901636BActive Publication Date: 2012-12-19CHINA INSTITUTE OF ATOMIC ENERGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2012-12-19

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Abstract

The invention discloses a gamma-spectrum detection system consisting of an antimony zinc cadmium detector and used for measuring burn-up of a spent fuel assembly. The system comprises a CZT detector, a digital multi-channel analyzer, a shielding aligner, a shield, a pressure-resistant sealing container and the like, wherein the shielding aligner is a cylinder; a conical groove is formed on an upper part of the shielding aligner; a movable slider is arranged in the conical groove; the movable slider is dragged by a step motor through a screw to move up and down; and the width of an alignment hole is controlled to be 0-5 mm. The system controls the width of the alignment hole by adjusting the movable slider so as to control a full-spectrum counting rate of a detected energy spectrum within a proper range and obtain relatively high measurement precision. Meanwhile, the measuring system is relatively compact and is favorable to be freely moved in a spent fuel assembly storage pool for in situ measurement.
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Description

technical field

[0001] The invention belongs to the technical field of gamma ray radiation measurement, in particular to a gamma spectrum detection system composed of cadmium zinc telluride detectors used for measuring the burnup of spent fuel assemblies. Background technique

[0002] The non-destructive measurement methods of spent fuel burnup mainly include: Cherenkov glow detection, total gamma, high resolution gamma spectrum (HRGS), passive neutron and active neutron measurement, etc. The fork-shaped detector composed of passive neutron measurement and high-resolution HPGe gamma spectrometer can be used for burnup measurement of spent fuel, but usually requires a complex hardware system, and the collimation part of the front end of the HPGe detector often needs to be installed Inside the facility, if the system design is not done well in advance, it will be very difficult to retrofit later.

[0003] Although the energy resolution of cadmium zinc telluride detectors (her...

Examples

Embodiment Construction

[0017] The technical solutions provided by the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0018] like figure 1 As shown, a spent fuel assembly gamma spectrum detection system is mainly composed of the following parts: CZT detector 1, digital multi-channel analyzer (including spectrum acquisition and analysis software), shielding body 2, shielding collimator 8, And a pressure-resistant sealed container 11.

[0019] This embodiment adopts the CPG type CZT detector 1 (crystal size is 15×15×7.5mm) of American EV Product Company 3 ), the energy range is 30keV~10MeV, the detector shell is cylindrical (Φ38.1mm×159.5mm), for 137 The 662keV energy resolution of the Cs point source is better than 2%.

[0020] The digital multi-channel analyzer is the Inspec2000 multi-channel analyzer of CANBERRA Company in the United States, and the spectrum acquisition and analysis software is the commercial software Genie2000 of the company. ...