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Delayed neutron detection apparatus fuel damage

A technology of delayed neutron and detection device, which is applied in the field of delayed neutron detection device, can solve the problems of high risk and cannot use sodium-cooled fast reactor, etc., and achieves the effects of ensuring safety, convenient insertion and removal, and avoiding safety risks.

Active Publication Date: 2008-12-31
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology

However, this method cannot be used in sodium-cooled fast reactors, because the risk of leading out the sodium in the primary circuit is extremely high

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  • Delayed neutron detection apparatus fuel damage
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Embodiment Construction

[0016] The technical solution of the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0017] Such as figure 1 As shown, a detection device for the damage detection of fuel elements in sodium-cooled fast reactors can judge the severity of exposed damage of fuel elements by detecting the relative fluence rate of delayed neutrons in the coolant sodium in the primary loop of the reactor, so as to ensure Reactor safety. The delayed neutron detection device is installed outside the stack container opposite to the main heat exchanger to detect the delayed neutrons released from the main heat exchanger, that is, the delayed neutrons released by the primary loop of sodium.

[0018] The device includes detection station, detector, amplifier and shaper 4, processor 5, display and alarm terminal 6 and other parts, all parts are connected by cables. In order to ensure that in an accident state, the detection station will not fail due to ...

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Abstract

The invention discloses a delayed neutron detecting device used for detecting the fuel element rupture which comprises parts such as a detection station, a detector, an amplifier, a processor, a display and an alarming terminal. Each part is connected together by cables, wherein, the detection station is a rectangle, in middle of the rectangular shell thereof, a neutron detector and a detector conduit are positioned; around the detector conduit, a moderation layer aiming at delayed neutrons is arranged and the interior of the detector conduit is provided with a tabular lead shielding for obstructing gamma rays. Aiming at eliminating the disturbance of background neutrons, except the interior towards the core of a reactor, the upside, underside, front-side, back-side and the exterior of the rectangular shell are all provided with the moderation layer and an absorption layer both aiming at the background neutrons. The lead shielding, the moderation layer and the absorption layer are all tabular and can be overlapped to change the thickness, convenient for plugging and pulling and installation and replacement and avoid safety risk brought by the introduction of natrium.

Description

technical field [0001] The invention belongs to the technical field of neutron detection, in particular to a delayed neutron detection device for detecting fuel element damage. Background technique [0002] No matter pressurized water reactor or fast neutron value-added reactor, the detection of fuel element damage is a much concerned issue. Usually, the damage detection of PWR fuel elements uses the sip detection method, that is, to detect the tightness of the fuel assembly. The principle is to increase the internal pressure (heating) of the fuel or reduce the external pressure of the fuel by isolating the detected fuel assembly. , to accelerate the release of fission products through the cladding of damaged fuel to detect the existence of fission products. In addition, Chinese patent 2006 1 0087597.3 discloses another damaged fuel location detection method, that is, real-time monitoring of the change trend of the gamma dose between discharge tanks, and judging whether it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C17/04
CPCY02E30/30
Inventor 刘玉璞刘浩杰蒋廷三李蔚方
Owner CHINA INSTITUTE OF ATOMIC ENERGY
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