CN106803434A - For the system of the netron-flux density in Measurement channel - Google Patents
For the system of the netron-flux density in Measurement channel Download PDFInfo
- Publication number
- CN106803434A CN106803434A CN201710055542.2A CN201710055542A CN106803434A CN 106803434 A CN106803434 A CN 106803434A CN 201710055542 A CN201710055542 A CN 201710055542A CN 106803434 A CN106803434 A CN 106803434A
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- Prior art keywords
- probe
- optical cable
- netron
- flux density
- measurement channel
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/10—Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
- G21C17/108—Measuring reactor flux
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Measurement Of Radiation (AREA)
Abstract
The invention discloses a kind of system of the netron-flux density in Measurement channel, the system includes：First measurement apparatus, the first measurement apparatus include：First probe；First photomultiplier；And first optical cable, with the first photomultiplier be connected the first probe by the first optical cable, and the first measurement apparatus are for the signal corresponding with background and signal corresponding with neutron in Measurement channel；And second measurement apparatus, the second measurement apparatus include：Second probe；Second photomultiplier；And second optical cable, with the second photomultiplier be connected the second probe by the second optical cable, and the second measurement apparatus are for the signal corresponding with background in only Measurement channel and can not measure the signal corresponding with neutron in passage.Using technical scheme, the influence of background and environment gamma ray can be filtered out, it is not necessary to specially do signal screening.
Description
Technical field
Embodiments of the invention are related to a kind of system of the netron-flux density in Measurement channel.
Background technology
Generally, use3He or BF3Etc. the netron-flux density of counter measures reactor in-core.
The content of the invention
The purpose of embodiments of the invention is to provide a kind of system of the netron-flux density in Measurement channel, by
This, for example, certainty of measurement can be mentioned.
Embodiments in accordance with the present invention, there is provided a kind of system of netron-flux density in Measurement channel, this is
System includes：First measurement apparatus, the first measurement apparatus include：First probe；First photomultiplier；And first optical cable,
With the first photomultiplier be connected first probe by one optical cable, and the first measurement apparatus in Measurement channel with background pair
The signal and signal corresponding with neutron answered；And second measurement apparatus, the second measurement apparatus include：Second probe；Second light
Electric multiplier tube；And second optical cable, with the second photomultiplier be connected the second probe by the second optical cable, and the second measurement apparatus
For the signal corresponding with background in only Measurement channel and the signal corresponding with neutron in passage can not be measured.
Embodiments in accordance with the present invention, the first probe and the second probe link together, and the first optical cable and the second light
Cable is integral.
Embodiments in accordance with the present invention, the described system for the netron-flux density in Measurement channel also includes：Move
Dynamic device, the mobile device is used to make the first probe and the second probe be moved in passage by mobile first optical cable and the second optical cable
It is dynamic.
Embodiments in accordance with the present invention, the mobile device is lowering or hoisting gear, for by lifting the first optical cable and second
Optical cable makes the first probe and the second probe be lifted in passage.
Embodiments in accordance with the present invention, the lowering or hoisting gear includes：Frame；The lifters that can be lifted relative to frame, the
One optical cable and the second optical cable can be connected to lifters；And power source, for driving lifters to be lifted relative to frame.
The probe of embodiments in accordance with the present invention first is provided with primary scintillator detector, and the second probe is provided with the second sudden strain of a muscle
Bright bulk detector, primary scintillator detector has neutron transformation substance, primary scintillator detector is can be measured that with
The corresponding signal of son.
Embodiments in accordance with the present invention, the first optical cable includes first sleeve, and the first optical fiber being arranged in first sleeve,
First sleeve be provided with the end of the first probe in be provided with primary scintillator detector, primary scintillator detector and the first light
Fibre connection；And second optical cable include the second sleeve pipe, and the second optical fiber being arranged in the second sleeve pipe, in being provided with for the second sleeve pipe
Secondary fluor detector is provided with the end of the second probe, secondary fluor detector is connected with the second optical fiber.
Embodiments in accordance with the present invention, primary scintillator detector is enclosed in the end of first sleeve by closure member,
And secondary fluor detector is enclosed in the end of the second sleeve pipe by closure member.
Embodiments in accordance with the present invention, primary scintillator detector is by a kind of and neutron transformation substance in ZnS and Ag6LiF、235U and232One kind in Th is made, and secondary fluor detector is made up of ZnS or Ag.
Embodiments in accordance with the present invention, the passage is the passage in reactor.
Technical scheme is used, for example, the influence of background and environment gamma ray can be filtered out, it is not necessary to specially
Door does signal screening.
Brief description of the drawings
Fig. 1 is a kind of signal of the system of the netron-flux density in Measurement channel according to embodiments of the invention
Figure；
Fig. 2 is a kind of probe of the system of the netron-flux density in Measurement channel according to embodiments of the invention
The close-up schematic view of side；
Fig. 3 is the lowering or hoisting gear of the system for the netron-flux density in Measurement channel according to embodiments of the invention
Schematic diagram；
Fig. 4 is the photomultiplier transit of the system for the netron-flux density in Measurement channel according to embodiments of the invention
The structure chart of pipe and fiber coupling；
Fig. 5 is a measurement of the system for the netron-flux density in Measurement channel according to embodiments of the invention
Result figure；And
Fig. 6 is the measurement result of the system for the netron-flux density in Measurement channel according to embodiments of the invention
With the comparing figure of the measurement result of solid state nuclear track detector.
Specific embodiment
Below in conjunction with the accompanying drawings and specific embodiment the present invention will be further described.
Referring to Fig. 1 to 4, according to an embodiment of the invention for the system 100 of the netron-flux density in Measurement channel
Including：First measurement apparatus 1, the first measurement apparatus 1 include：First probe 11；First photomultiplier 12；And first optical cable
15, be connected the first probe 11 with the first photomultiplier 12 (so that the optical signal from the first probe 11 exists by the first optical cable 15
Electric signal is converted into first photomultiplier 12), and the first measurement apparatus 1 are for corresponding with background in Measurement channel
Signal and signal corresponding with neutron；And second measurement apparatus 2, the second measurement apparatus 2 include：Second probe 21；Second light
Electric multiplier tube 22；And second optical cable 25, the second optical cable 25 second probe 21 is connected with the second photomultiplier 22 (so as to
From the optical signal of the second probe 21 electric signal is converted into the second photomultiplier 22), and the second measurement apparatus 2 are for only
Signal corresponding with background only in Measurement channel and the signal corresponding with neutron in passage can not be measured.The passage can
Being the passage in reactor.That is, system of the invention can be used for the measurement of the netron-flux density of reactor in-core.
Referring to Fig. 1 and 3, embodiments in accordance with the present invention, the first probe 11 and the second probe 21 link together, and the
One optical cable 15 and the second optical cable 25 are integral.Thus the first probe 11 and the second probe 21 are enable while moving.
Referring to Fig. 1 and 3, the system 100 for the netron-flux density in Measurement channel also includes mobile device 3, the shifting
Dynamic device 3 is used to make the first probe 11 and the second probe 21 be moved in passage by mobile first optical cable 15 and the second optical cable 25
It is dynamic.As shown in figs. 1 and 3, example of the invention, the mobile device 3 is lowering or hoisting gear, for by lifting the first optical cable
15 and second optical cable 25 the first probe 11 and the second probe 21 is lifted in passage.The lowering or hoisting gear includes：Frame 31；Can
Relative to the lifters 32 that frame 31 is lifted, the first optical cable 15 and the second optical cable 25 can be connected to lifters 32；And power
Source 35, such as stepper motor, for driving lifters 32 to be lifted relative to frame 31.For example, by nut and screw drive, driving
Dynamic lifters 32 are lifted relative to frame 31.Lifters 32 can include crossbeam 33, the optical cable 25 of first optical cable 15 and second
It is connected on crossbeam 33 by the sliding part 34 (such as sliding block) that can be slided on crossbeam 33.First optical cable 15 and the second optical cable
25 are fixed on sliding part 34, such as each in the first optical cable 15 and the second optical cable 25 is fixed on a sliding part 34, or
Both one optical cable 15 and the second optical cable 25 are fixed on a sliding part 34, and the first optical cable 15 of such as one and the second optical cable 25 are consolidated
Due to a sliding part 34.
Referring to Fig. 1 and 2, embodiments in accordance with the present invention, the first probe 11 is provided with primary scintillator detector 111, and
Second probe 21 is provided with secondary fluor detector 211, and primary scintillator detector 111 has neutron transformation substance, makes first
Scintillator detector 111 can be measured that signal corresponding with neutron.For example, primary scintillator detector 111 is by ZnS and Ag
It is a kind of with neutron transformation substance6LiF、235U and232One kind in Th is made, and secondary fluor detector 211 is by ZnS or Ag systems
Into.
Referring to Fig. 1 and 2, embodiments in accordance with the present invention, the first optical cable 15 includes first sleeve 151, and is arranged on first
The first optical fiber 152 in sleeve pipe 151, first sleeve 151 be provided with the end of the first probe 11 in be provided with primary scintillator visit
Device 111 is surveyed, primary scintillator detector 111 is connected (to transmit optical signal) with the first optical fiber 152；And second optical cable 25 include
Second sleeve pipe 251, and the second optical fiber 252 being arranged in the second sleeve pipe 251, the second probe 21 is provided with the second sleeve pipe 251
End in be provided with secondary fluor detector 211, secondary fluor detector 211 is connected 252 with the second optical fiber (to transmit light
Signal).Example of the invention, primary scintillator detector 211 is enclosed in the end of first sleeve 151 by closure member 153
In portion, and secondary fluor detector 211 is enclosed in the end of the second sleeve pipe 251 by closure member 253.Closure member 153
Can be formed by aluminium film with closure member 253, for example, be formed by 0.1 millimeter to 1 millimeter of aluminium film, such as by about 0.5 millimeter
Aluminium film is formed.The sleeve pipe 251 of first sleeve 151 and second can be formed by plastics, and can be the sleeve pipe of black.First flicker
The first sleeve 151 and of bulk detector 111 and secondary fluor detector 211 in the sleeve pipe 251 of first sleeve 151 and second
Length on the axial direction of two sleeve pipes 251 can be 1 millimeter to 10 millimeters, for example, can be about 3 millimeters.Primary scintillator
The first sleeve 151 and second of detector 111 and secondary fluor detector 211 in the sleeve pipe 251 of first sleeve 151 and second
Length on the axial direction of sleeve pipe 251 can be with roughly equal.
As shown in figure 1, also including counting acquisition system 5 for the system 100 of the netron-flux density in Measurement channel, use
In the counting for obtaining the first photomultiplier 12 and the second photomultiplier 22；And the processor 6 of such as computer, for right
The counting of the first photomultiplier 12 and the second photomultiplier 22 is processed.
Embodiments in accordance with the present invention, probe size is small, and signal is by Optical Fiber Transmission, the neutron that can be used in small space
Flux measurement, and with locus sensitivity；Transmission Fibers have a preferable anti-radiation performance, and system counting rate not
Height, can be used for high flux neutron flux measurement in reactor；System utilizes two measurement apparatus, can filter out background and gamma
Signal, it is not necessary to specially do signal screening.
Embodiments in accordance with the present invention, the system for the netron-flux density in Measurement channel can be used in narrow passage
The measurement of netron-flux density distribution, probe size is small, the measurement of the neutron flux that can be used in reactor inner fuel component；
System utilizes fiber optic conduction, and the movement of optical fiber is accurately driven using stepper motor, can be to each position essence in detection duct
Really measurement；Using the first measurement apparatus and the second measurement apparatus, i.e., using with reference to popping one's head in, can accurately filter out background and ring
The influence of border gamma ray, system need not do special signal screening；System is small due to probe size, and counting rate is not high,
Can be used for high flux neutron detection in reactor, be not in the blocking of system counts.
Embodiments in accordance with the present invention, because probe size is small, the neutron flux that can be used in reactor fuel assemblies is surveyed
Amount, it is not necessary to special to set up detection duct.
Embodiments in accordance with the present invention, system transmits optical signal using optical fiber, and probe size is small, easily mobile, using step
Stepper motor accurately drives, and each position carries out accurate measurement to duct to can control probe.
Embodiments in accordance with the present invention, system is easily worked manufacture, and low cost, performance can meet reactor internal measurement pair
Detector requirement, for example：(1) probe has the life-span very high, conducts the anti-radiation performance of optical fiber preferably, can be used for
The measurement of high-radiation field；(2) mobility is preferable, it is ensured that the position sensitive of probe；(3) spectral purity is high, can be applied to
Background and environment ray reactor internal measurement high；(4) measurement of high flux can be carried out, system is not in count stifled
Plug.
Embodiments in accordance with the present invention, as illustrated in fig. 1 and 2, the first set of the end of the first optical cable 15 and the second optical cable 25
The different detection materials being of uniform thickness are scribbled in the sleeve pipe 251 of pipe 151 and second, two overall diameters of optical fiber can be less than 5mm, can
For in the aperture of more than 5mm.Signal photon reaches the first photomultiplier 12 and the second photomultiplier 22 by optical fiber,
Acquisition system 5 is counted to collect.
Fig. 4 shows the embodiment of the structure of photomultiplier and fiber coupling, as shown in figure 4, optical fiber and the first photoelectricity
The photomultiplier 22 of multiplier tube 12 and second can be coupled with silicone oil, the photomultiplier of whole first photomultiplier 12 and second
22 are in complete lucifuge state.Signal is obtained by the first measurement apparatus 1 and the second measurement apparatus 2, the first measurement apparatus 1 and the
The difference of the counting of two measurement apparatus 2 is effective neutron counting.The measurement of diverse location is by changing the position popped one's head in.Such as Fig. 3
Shown mobile device, displacement can be accurate to 0.1mm.Mobile device is integrally placed on outside reator body, and crossbeam is reached on reactor core
Side, optical fiber is connected to above crossbeam, the available many cunnings for measuring different ducts simultaneously with optical fiber, need to only adjusting on crossbeam of single
Block.By the overall vertical-lifting of crossbeam, the position of fibre-optical probe changes therewith.The structure bag of photomultiplier and fiber coupling
Include：Seal pipe 72, the first photomultiplier 12 and the second photomultiplier 22 are arranged in seal pipe 72.Photomultiplier and light
The structure of fibre coupling also includes the preceding closure 71 of the opening for the one end of close encapsulation pipe 72, and preceding closure 71 is provided with hole, uses
In insertion optical cable；And the rear closure 70 of the opening for the other end of close encapsulation pipe 72, the rear closure 70 is provided with insertion
The signaling interface 61 of holding wire and the high voltage interface 60 of insertion high-voltage line.
By test experiments, probe uses thermal neutron detection material to the system6LiF, three of measurement reactor
Different types of duct, measurement result are as shown in figure 5, heap in-core, fast area is mainly natural uranium original paper, the neutron total flux in the area
It is higher with respect to for hot-zone, but thermal neutron share is relatively fewer, and hot-zone causes thermal neutron share due to the presence of slowing down layer
It is of a relatively high.Axial distance is the location of zero position as outside interruption in Fig. 5, and the neutron flux near this position is most
It is high.As can be seen that the axial Neutron flux distribution of sub-critical reactor is low for middle high, two ends from test result, this and heap mandrel
In cosine distribution it is consistent to neutron fluence rate, but in asymmetric distribution, is primarily due to reactor and only installs additional at one end
Reflecting layer, therefore, there is the neutron flux of reflecting layer one end higher than areflexia layer one end.
In order to verify the system of the netron-flux density being used in Measurement channel according to an embodiment of the invention in heap
The reliability of measurement, the relatively core fission rate distribution results obtained with reference to solid state nuclear track detector measurement are compared.Due to solid
Body nuclear track detector is used235U is coupled as fissioner target with muscovite detector, its measurement mainly thermal neutron into
Point, with use6The measurement range of the system for the netron-flux density in Measurement channel of LiF is basically identical, therefore both
Measurement result can mutually verify.It is different in view of two kinds of detection efficients of system, counting rate can be made normalized, only
The variation tendency of contrast relative flux distribution, as shown in Figure 6.The result that two germline unified tests are obtained, flux density Relative distribution trend
Meet very good.
Claims (10)
1. the system of a kind of netron-flux density in Measurement channel, including：
First measurement apparatus, the first measurement apparatus include：First probe；First photomultiplier；And first optical cable, the first light
With the first photomultiplier be connected first probe by cable, and the first measurement apparatus are for corresponding with background in Measurement channel
Signal and signal corresponding with neutron；And
Second measurement apparatus, the second measurement apparatus include：Second probe；Second photomultiplier；And second optical cable, the second light
With the second photomultiplier be connected second probe by cable, and the second measurement apparatus in only Measurement channel with background pair
The signal answered and the signal corresponding with neutron in passage can not be measured.
2. the system of the netron-flux density in Measurement channel according to claim 1, wherein：
First probe and the second probe link together, and the first optical cable and the second optical cable are integral.
3. the system of the netron-flux density in Measurement channel according to claim 1 and 2, also includes：
Mobile device, the mobile device is used to make the first probe and the second probe logical by mobile first optical cable and the second optical cable
Moved in road.
4. the system of the netron-flux density in Measurement channel according to claim 3, wherein：
The mobile device is lowering or hoisting gear, for making the first probe and the second probe by lifting the first optical cable and the second optical cable
Lifted in passage.
5. the system of the netron-flux density in Measurement channel according to claim 4, wherein：
The lowering or hoisting gear includes：Frame；The lifters that can be lifted relative to frame, the first optical cable and the second optical cable can be connected
In lifters；And power source, for driving lifters to be lifted relative to frame.
6. the system of the netron-flux density in Measurement channel according to claim 1, wherein：
First probe is provided with primary scintillator detector, and the second probe is provided with secondary fluor detector, primary scintillator
Detector has neutron transformation substance, primary scintillator detector is can be measured that signal corresponding with neutron.
7. the system of the netron-flux density in Measurement channel according to claim 6, wherein：
First optical cable includes first sleeve, and the first optical fiber being arranged in first sleeve, and the first spy is provided with first sleeve
Primary scintillator detector is provided with the end of head, primary scintillator detector is connected with the first optical fiber；And
Second optical cable includes the second sleeve pipe, and the second optical fiber being arranged in the second sleeve pipe, and the second spy is provided with the second sleeve pipe
Secondary fluor detector is provided with the end of head, secondary fluor detector is connected with the second optical fiber.
8. the system of the netron-flux density in Measurement channel according to claim 7, wherein：
Primary scintillator detector is enclosed in the end of first sleeve by closure member, and secondary fluor detector passes through
Closure member is enclosed in the end of the second sleeve pipe.
9. the system of the netron-flux density in Measurement channel according to claim 6, wherein：
Primary scintillator detector is by a kind of and neutron transformation substance in ZnS and Ag6LiF、235U and232One kind in Th is made,
Secondary fluor detector is made up of ZnS or Ag.
10. the system of the netron-flux density in Measurement channel according to claim 1, wherein：
The passage is the passage in reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710055542.2A CN106803434A (en) | 2017-01-24 | 2017-01-24 | For the system of the netron-flux density in Measurement channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710055542.2A CN106803434A (en) | 2017-01-24 | 2017-01-24 | For the system of the netron-flux density in Measurement channel |
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| Publication Number | Publication Date |
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| CN106803434A true CN106803434A (en) | 2017-06-06 |
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ID=58987248
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710055542.2A Pending CN106803434A (en) | 2017-01-24 | 2017-01-24 | For the system of the netron-flux density in Measurement channel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111399028A (en) * | 2020-03-19 | 2020-07-10 | 哈尔滨工程大学 | Neutron terminal of multipurpose |
-
2017
- 2017-01-24 CN CN201710055542.2A patent/CN106803434A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111399028A (en) * | 2020-03-19 | 2020-07-10 | 哈尔滨工程大学 | Neutron terminal of multipurpose |
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