CN114152992A - Passive monitoring method and system for blockage of feed hopper of spent fuel dissolver - Google Patents
Passive monitoring method and system for blockage of feed hopper of spent fuel dissolver Download PDFInfo
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- CN114152992A CN114152992A CN202111457544.7A CN202111457544A CN114152992A CN 114152992 A CN114152992 A CN 114152992A CN 202111457544 A CN202111457544 A CN 202111457544A CN 114152992 A CN114152992 A CN 114152992A
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- 239000002915 spent fuel radioactive waste Substances 0.000 title claims abstract description 73
- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 88
- 239000000446 fuel Substances 0.000 claims abstract description 82
- 238000012545 processing Methods 0.000 claims description 41
- 238000004458 analytical method Methods 0.000 claims description 27
- 230000005251 gamma ray Effects 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
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- 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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Abstract
The invention provides a passive monitoring method and a passive monitoring system for blockage of a feed hopper of a spent fuel dissolver, wherein the method comprises the following steps: the detection systems are arranged at the top and the bottom of a feed hopper chute close to the spent fuel dissolver, when the spent fuel dissolver feeds, the two detection systems respectively detect gamma rays emitted by fuel short rods at the top and the bottom of the feed hopper chute, and respectively acquire pulse counting rates N corresponding to the gamma rays entering the detection systems in a set energy interval1And N2(ii) a According to pulse count rate N1Calculating the number n of fuel stubs passing the top of the hopper chute1According to the pulse count rate N2Calculating the number n of fuel stubs passing through the bottom of the feed hopper chute2When n is1And n2When the difference value is larger than the set value, the blockage of the feed hopper of the spent fuel dissolver can be accurately judged.
Description
Technical Field
The invention particularly relates to a passive monitoring method and a passive monitoring system for blockage of a feed hopper of a spent fuel dissolver.
Background
A passive monitoring device for the blockage of a feed hopper of a spent fuel dissolver is a key device for ensuring the normal operation of the spent fuel dissolver. In a spent fuel reprocessing scheme, fuel rods are cut into short segments of fuel, about 20-50mm in length, which are fed through a chute into one of 14 scoops in a dissolver. The dissolver is then rotated counterclockwise, so that the fuel in the short section of fuel in the scoop is removed from the dissolver through the discharge chute after being sufficiently dissolved in the nitric acid dissolving solution.
Because the spent fuel dissolver contains a large amount of radioactive substances, in order to ensure the safety of the dissolving process, the blockage monitoring of the feed hopper of the dissolver needs to be carried out for checking whether the chute is blocked or not, so as to ensure the feeding safety and provide guarantee for the subsequent process. Because the dissolver is wholly closed and the radioactivity level is extremely high, the personnel can not approach to monitor by adopting the conventional method.
Disclosure of Invention
The invention aims to solve the technical problem of providing an automatic and accurate passive monitoring method for the blockage of a feed hopper of a spent fuel dissolver aiming at the defects in the prior art and correspondingly providing a system for realizing the method.
The technical scheme adopted for solving the technical problem of the invention is as follows:
the invention provides a passive monitoring method for blockage of a feed hopper of a spent fuel dissolver, which comprises the following steps:
s1: a first detection system is arranged at the position close to the top of a feed hopper chute of the spent fuel dissolver, a second detection system is arranged at the position close to the bottom of the feed hopper chute of the spent fuel dissolver,
s2: when the spent fuel dissolver feeds materials, the first detection system detects gamma rays emitted by the fuel short rod passing through the top of the feed hopper chute and acquires the pulse counting rate N corresponding to the gamma rays entering the first detection system in a set energy interval1(ii) a The second detection system detects gamma rays emitted by the fuel short rod at the bottom of the feed hopper chute and obtains the pulse counting rate N corresponding to the gamma rays entering the second detection system in a set energy interval2；
S3: according to the pulse counting rate N1Calculating the number n of fuel stubs passing the top of the hopper chute1According to said pulse count rate N2Calculating the number n of fuel stubs passing through the bottom of the feed hopper chute2When n is1And n2When the difference value is larger than the set value, the blockage of the feed hopper of the spent fuel dissolver is judged.
Alternatively, n is calculated separately using equation (1)1And n2：
n＝N/(a·M·K) (1)
n-represents the number of fuel stubs;
n-represents the pulse count rate obtained by the detection system;
k represents the detection efficiency of the detection system for detecting the gamma rays;
a-represents the specific activity of the fuel short rod;
m-represents the mass of each fuel rod.
Step S3 is optionally implemented using a data processor, which includes a calculation module and a comparison module,
the calculation module calculates and calculates the pulse counting rate N according to the formula (1) stored in the calculation module1Number n of corresponding fuel stubs passing the top of the feed hopper chute1And calculating and pulse counting rate N2Number n of corresponding fuel stubs passing the bottom of the feed hopper chute2，
The comparison module judges n1And n2If the difference is larger than the set value, when the judgment result is 'yes', an alarm signal of the blockage of the feed hopper of the spent fuel dissolver is output.
Optionally, the first detection system comprises a first detector and a first signal analysis processing system, the first signal analysis processing system is electrically connected with the first detector,
the first detector receives the gamma ray entering the first detector and converts the gamma ray into a pulse signal to be output,
the first signal analysis processing system receives the pulse signal output by the first detector and processes the pulse signal to obtain a pulse counting rate N corresponding to the gamma ray in the first detector in a set energy interval1。
Optionally, the second detection system comprises a second detector and a second signal analysis processing system, the second signal analysis processing system is electrically connected with the second detector,
the second detector receives the gamma ray entering the second detector and converts the gamma ray into a pulse signal to be output,
the second signal analysis and processing system receives the pulse signal output by the second detector and processes the pulse signal to obtain a pulse counting rate N corresponding to the gamma ray in the second detector in a set energy interval2。
The invention also provides a passive monitoring system for the blockage of the feed hopper of the spent fuel dissolver, which comprises the following components: a first detection system, a second detection system and a data processor, wherein the first detection system and the second detection system are electrically connected with the data processor,
the first detection system is arranged at a position close to the top of a feed hopper chute of the spent fuel dissolver, the second detection system is arranged at a position close to the bottom of the feed hopper chute of the spent fuel dissolver,
the first detection system is used for detecting gamma rays emitted by a fuel short rod passing through the top of a feed hopper chute when the spent fuel dissolver feeds materials, and acquiring a pulse counting rate N corresponding to the gamma rays entering the first detection system in a set energy interval1(ii) a The second detection system is used for detecting gamma rays emitted by a fuel short rod at the bottom of the feed hopper chute when the spent fuel dissolver feeds materials, and acquiring the pulse counting rate N corresponding to the gamma rays entering the second detection system in a set energy interval2；
The data processor is used for counting the pulse counting rate N according to the pulse1Calculating the number n of fuel stubs passing the top of the hopper chute1And according to said pulse count rate N2Calculating the number n of fuel stubs passing through the bottom of the feed hopper chute2And also for determining n1And n2If the difference is larger than the set value, when the judgment result is 'yes', an alarm signal of the blockage of the feed hopper of the spent fuel dissolver is output.
Optionally, the first detection system comprises a first detector and a first signal analysis processing system,
the first detector is used for receiving gamma rays entering the first detector and converting the gamma rays into pulse signals to be output,
the first signal analysis processing system is electrically connected with the first detector and is used for receiving the pulse signals output by the first detector and processing the pulse signals to obtain a pulse counting rate N corresponding to gamma rays in the first detector in a set energy interval1。
Optionally, the second detection system comprises a second detector and a second signal analysis processing system,
the second detector is used for receiving the gamma rays entering the second detector and converting the gamma rays into pulse signals to be output,
the second signal analysis and processing system is electrically connected with the second detector and is used for receivingThe pulse signal output by the second detector is processed to obtain the pulse counting rate N corresponding to the gamma ray in the second detector in the set energy interval2。
Optionally, the data processor comprises a calculation module and a comparison module,
the calculation module is used for calculating the pulse counting rate N according to a relational expression of the pulse counting rate N and the number N of the fuel short rods stored in the calculation module1Number n of corresponding fuel stubs passing the top of the feed hopper chute1And calculating and pulse counting rate N2Number n of corresponding fuel stubs passing the bottom of the feed hopper chute2，
The comparison module is used for judging n1And n2If the difference is larger than the set value, when the judgment result is 'yes', an alarm signal of the blockage of the feed hopper of the spent fuel dissolver is output.
Optionally, the pulse count rate N is related to the number N of fuel stubs by the following formula (1):
n＝N/(a·M·K) (1)
n-represents the number of fuel stubs;
n-represents the pulse count rate obtained by the detection system;
k represents the detection efficiency of the detection system for detecting the gamma rays;
a-represents the specific activity of the fuel short rod;
m-represents the mass of each fuel rod.
In the invention, the detection systems are respectively arranged at the positions close to the top and the bottom of the feed hopper chute of the spent fuel dissolver, when the spent fuel dissolver feeds, gamma rays emitted by the fuel short rods passing through the top and the bottom of the feed hopper chute are respectively detected by two detection systems, and the pulse counting rate of the gamma ray entering the pulse counting device corresponding to the set energy interval is obtained through processing, because the pulse counting rate detection precision is limited, whether the feed hopper of the spent fuel dissolver is blocked or not is difficult to judge by directly comparing the pulse counting rates corresponding to the top and the bottom, the invention calculates the number of the fuel short rods passing through the top and the bottom of the feed hopper chute according to the pulse counting rate N, the number of the short fuel rods at the top and the bottom is compared, and the number of the short fuel rods at the top of the feed hopper chute is compared, so that whether the feed hopper of the spent fuel dissolver is blocked or not can be accurately judged.
Drawings
FIG. 1 is a side view of a spent fuel dissolver feed hopper;
FIG. 2 is a layout diagram of a passive monitoring detector for blockage of a feed hopper of a spent fuel dissolver;
FIG. 3 is a flow chart of a method for passive monitoring of clogging of a spent fuel dissolver feed hopper;
fig. 4 is a schematic diagram of the connection of the detection system and the data processor.
Detailed Description
The technical solutions in the present invention will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the scope of the present invention.
In the description of the present invention, it should be noted that the indication of orientation or positional relationship, such as "on" or the like, is based on the orientation or positional relationship shown in the drawings, and is only for convenience and simplicity of description, and does not indicate or imply that the device or element referred to must be provided with a specific orientation, constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected," "disposed," "mounted," "fixed," and the like are to be construed broadly, e.g., as being fixedly or removably connected, or integrally connected; either directly or indirectly through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.
The invention provides a passive monitoring method for blockage of a feed hopper of a spent fuel dissolver, which comprises the following steps:
s1: a first detection system is arranged at the position close to the top of a feed hopper chute of the spent fuel dissolver, a second detection system is arranged at the position close to the bottom of the feed hopper chute of the spent fuel dissolver,
s2: when the spent fuel dissolver feeds materials, the first detection system detects gamma rays emitted by the fuel short rod passing through the top of the feed hopper chute and acquires the pulse counting rate N corresponding to the gamma rays entering the first detection system in a set energy interval1(ii) a The second detection system detects gamma rays emitted by the fuel short rod at the bottom of the feed hopper chute and obtains the pulse counting rate N corresponding to the gamma rays entering the second detection system in a set energy interval2；
S3: according to the pulse counting rate N1Calculating the number n of fuel stubs passing the top of the hopper chute1According to said pulse count rate N2Calculating the number n of fuel stubs passing through the bottom of the feed hopper chute2When n is1And n2When the difference value is larger than the set value, the blockage of the feed hopper of the spent fuel dissolver is judged.
The invention also provides a passive monitoring system for the blockage of the feed hopper of the spent fuel dissolver, which comprises the following components: a first detection system, a second detection system and a data processor, wherein the first detection system and the second detection system are electrically connected with the data processor,
the first detection system is arranged at a position close to the top of a feed hopper chute of the spent fuel dissolver, the second detection system is arranged at a position close to the bottom of the feed hopper chute of the spent fuel dissolver,
the first detection system is used for detecting gamma rays emitted by a fuel short rod passing through the top of a feed hopper chute when the spent fuel dissolver feeds materials, and acquiring a pulse counting rate N corresponding to the gamma rays entering the first detection system in a set energy interval1(ii) a The second detection system is used for detecting the spent fuel passing through the bottom of the feed hopper chute when the spent fuel dissolver feedsGamma ray emitted by the fuel short rod is obtained, and the pulse counting rate N corresponding to the gamma ray entering the fuel short rod in the set energy interval is obtained2；
The data processor is used for counting the pulse counting rate N according to the pulse1Calculating the number n of fuel stubs passing the top of the hopper chute1And according to said pulse count rate N2Calculating the number n of fuel stubs passing through the bottom of the feed hopper chute2And also for determining n1And n2If the difference is larger than the set value, when the judgment result is 'yes', an alarm signal of the blockage of the feed hopper of the spent fuel dissolver is output.
Example 1:
during the feed of the dissolver, the fuel rods are cut by shears into short segments of fuel of about 20-50mm in length, as shown in fig. 1 and 3, which fall down the chute into the bucket of the dissolver.
The embodiment provides a passive monitoring method for blockage of a feed hopper of a spent fuel dissolver, which comprises the following steps:
s1: a first detection system 1 is arranged at a position close to the top of the feeding hopper chute 41 of the spent fuel dissolver 4, a second detection system 2 is arranged at a position close to the bottom of the feeding hopper chute 41 of the spent fuel dissolver 4,
s2: when the spent fuel dissolver 4 feeds, the first detection system 1 detects gamma rays emitted by a fuel short rod passing through the top of the feed hopper chute 41 and acquires the pulse counting rate N corresponding to the gamma rays entering the gamma rays in a set energy interval1(ii) a The second detection system 2 detects the gamma rays emitted by the fuel short rod at the bottom of the feed hopper chute 41 and obtains the pulse counting rate N corresponding to the gamma rays entering the second detection system in the set energy interval2；
S3: according to pulse count rate N1Calculating the number n of fuel stubs passing the top of the feed hopper chute 411According to the pulse count rate N2Calculating the number n of fuel stubs passing the bottom of the feed hopper chute 412When n is1And n2When the difference value is larger than the set value, the blockage of the feed hopper of the spent fuel dissolver is judged.
Radioactivity of spent fuelThe highest of the degrees is137Cs, theoretically, by measurement137The net count of the 662keV gamma peak of Cs can be determined137Activity of Cs. Therefore, in this embodiment, the set energy interval is selected from 60keV to 3 MeV.
Specifically, a measuring point a and a measuring point b are arranged on one side of the chute, and correspond to the top and the bottom of the chute respectively. The measurement point a is provided with a first detection system 1 and the measurement point b is provided with a second detection system 2 (see fig. 2). The gamma radiation level measured by a detection system positioned at the top and the bottom of the chute is detected, the pulse counting rate corresponding to the gamma ray entering the chute in a set energy interval is obtained through processing, and the gliding state of the short fuel section is monitored by comparing the pulse counting rates corresponding to the top and the bottom of the chute, so that the continuity of the short fuel section transmission is monitored, and the short fuel section which is cut off can not be blocked and smoothly reaches the dissolver.
Because the pulse counting rate detection precision is limited, whether the feed hopper of the spent fuel dissolver is blocked or not is difficult to judge by directly comparing the pulse counting rates corresponding to the top and the bottom.
In this embodiment, n is calculated by the following equation (1)1And n2：
n＝N/(a·M·K) (1)
n-represents the number of fuel stubs;
n-represents the pulse count rate obtained by the detection system;
k represents the detection efficiency of the detection system for detecting the gamma rays;
a-represents the specific activity of the fuel short rod;
m-represents the mass of each fuel rod.
In this example, one fuel rod was cut into 100 fuel stubs.
In the calculation process, the radioactivity of the short fuel section before passing through the shielding body can be found out through a half-value stratification method, K, a is a known constant selected by a measured object and a detector, and M is a known quantity before the spent fuel rod is transported, so that the quantity of the short fuel section entering the chute can be accurately calculated.
In this embodiment, step S3 is implemented by using a data processor 3, the data processor 3 includes a calculating module 31 and a comparing module 32,
the calculation module 31 calculates the pulse count rate N according to equation (1) stored therein1Number n of corresponding fuel stubs passing the top of the feed hopper chute1And calculating and pulse counting rate N2Number n of corresponding fuel stubs passing the bottom of the feed hopper chute2，
The comparison module 32 determines n1And n2If the difference is larger than the set value, when the judgment result is 'yes', an alarm signal of the blockage of the feed hopper of the spent fuel dissolver is output.
In this embodiment, the first detection system 1 includes a first detector 11 and a first signal analysis processing system 12, the first signal analysis processing system 12 is electrically connected to the first detector 11,
the first detector 11 receives the gamma ray entering the first detector and converts the gamma ray into a pulse signal output,
the first signal analyzing and processing system 12 receives the pulse signal output by the first detector 11 and processes the pulse signal to obtain a pulse count rate N corresponding to the gamma ray in the first detector 11 in a set energy interval1。
Referring to fig. 4, the first signal analyzing and processing system 12 includes a first signal processing circuit 121 and a first pulse counting circuit 122, the first signal processing circuit 121 receives the pulse signal output by the first detector 11, and performs amplification, analog-to-digital conversion, discrimination, and the like on the pulse signal, and the first pulse counting circuit 122 counts the pulse signal processed by the first signal processing circuit 121 to obtain the number of pulses in a period, and sends the number of pulses to the data processor 3.
In this embodiment, the second detection system 2 comprises a second detector 21 and a second signal analysis processing system 22, the second signal analysis processing system 22 is electrically connected with the second detector 21,
the second detector 21 receives the gamma ray entering the second detector, converts the gamma ray into a pulse signal output,
the second signal analysis and processing system 22 receives the pulse signal output by the second detector 21 and processes the pulse signal to obtain a pulse count rate N corresponding to the gamma ray in the second detector 21 in a set energy interval2。
Referring to fig. 4, the second signal analyzing and processing system 22 includes a second signal processing circuit 221 and a second pulse counting circuit 222, the second signal processing circuit 221 receives the pulse signal output by the second detector 21 and performs amplification, analog-to-digital conversion, discrimination, and the like on the pulse signal, and the second pulse counting circuit 222 counts the pulse signal processed by the second signal processing circuit 221 to obtain the number of pulses in a period, and sends the number of pulses to the data processor 3.
The passive monitoring system for the blockage of the feed hopper performs the following operations after each cutting of the shearing machine:
(a) the first detector 11 receives the gamma rays entering therein and the second detector 21 delays receiving the gamma rays entering therein.
(b) The first signal analysis processing system 12 analyzes the radiometric signal triggered by the fuel pegs at the top of the chute.
(c) The second signal analysis processing system 22 analyzes the radiometric signals triggered by the trough bottom fuel spuds.
(d) The data processor 3 (computer) respectively calculates the number of the fuel short rods at the top and the bottom of the chute, and compares whether the measured values of the two signals are equal, so as to judge whether the fuel short rods slide down smoothly and realize the blockage monitoring in the chute.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A passive monitoring method for blockage of a feed hopper of a spent fuel dissolver is characterized by comprising the following steps:
s1: a first detection system is arranged at the position close to the top of a feed hopper chute of the spent fuel dissolver, a second detection system is arranged at the position close to the bottom of the feed hopper chute of the spent fuel dissolver,
s2: when the spent fuel dissolver feeds materials, the first detection system detects gamma rays emitted by the fuel short rod passing through the top of the feed hopper chute and acquires the pulse counting rate N corresponding to the gamma rays entering the first detection system in a set energy interval1(ii) a The second detection system detects gamma rays emitted by the fuel short rod at the bottom of the feed hopper chute and obtains the pulse counting rate N corresponding to the gamma rays entering the second detection system in a set energy interval2；
S3: according to the pulse counting rate N1Calculating the number n of fuel stubs passing the top of the hopper chute1According to said pulse count rate N2Calculating the number n of fuel stubs passing through the bottom of the feed hopper chute2When n is1And n2When the difference value is larger than the set value, the blockage of the feed hopper of the spent fuel dissolver is judged.
2. The passive monitoring method for the blockage of the feed hopper of the spent fuel dissolver according to claim 1, characterized in that the formula (1) is adopted to respectively calculate n1And n2：
n＝N/(a·M·K) (1)
n-represents the number of fuel stubs;
n-represents the pulse count rate obtained by the detection system;
k represents the detection efficiency of the detection system for detecting the gamma rays;
a-represents the specific activity of the fuel short rod;
m-represents the mass of each fuel rod.
3. The passive monitoring method for the blockage of the feed hopper of the spent fuel dissolver according to claim 2, characterized in that the step S3 is implemented by a data processor, the data processor comprising a calculation module and a comparison module,
the calculation module calculates and calculates the pulse counting rate N according to the formula (1) stored in the calculation module1Number n of corresponding fuel stubs passing the top of the feed hopper chute1And calculating and pulse counting rate N2Number n of corresponding fuel stubs passing the bottom of the feed hopper chute2，
The comparison module judges n1And n2If the difference is larger than the set value, when the judgment result is 'yes', an alarm signal of the blockage of the feed hopper of the spent fuel dissolver is output.
4. The passive monitoring method for the blockage of the feed hopper of the spent fuel dissolver according to any one of claims 1 to 3,
the first detection system comprises a first detector and a first signal analysis and processing system, the first signal analysis and processing system is electrically connected with the first detector,
the first detector receives the gamma ray entering the first detector and converts the gamma ray into a pulse signal to be output,
the first signal analysis processing system receives the pulse signal output by the first detector and processes the pulse signal to obtain a pulse counting rate N corresponding to the gamma ray in the first detector in a set energy interval1。
5. The passive monitoring method for the blockage of the feed hopper of the spent fuel dissolver according to any one of claims 1 to 3, characterized in that the second detection system comprises a second detector and a second signal analysis and processing system, the second signal analysis and processing system is electrically connected with the second detector,
the second detector receives the gamma ray entering the second detector and converts the gamma ray into a pulse signal to be output,
the second signal analysis and processing system receives the pulse signal output by the second detector and processes the pulse signal to obtain a pulse counting rate N corresponding to the gamma ray in the second detector in a set energy interval2。
6. A passive monitoring system for blockage of a feed hopper of a spent fuel dissolver is characterized by comprising: a first detection system, a second detection system and a data processor, wherein the first detection system and the second detection system are electrically connected with the data processor,
the first detection system is arranged at a position close to the top of a feed hopper chute of the spent fuel dissolver, the second detection system is arranged at a position close to the bottom of the feed hopper chute of the spent fuel dissolver,
the first detection system is used for detecting gamma rays emitted by a fuel short rod passing through the top of a feed hopper chute when the spent fuel dissolver feeds materials, and acquiring a pulse counting rate N corresponding to the gamma rays entering the first detection system in a set energy interval1(ii) a The second detection system is used for detecting gamma rays emitted by a fuel short rod at the bottom of the feed hopper chute when the spent fuel dissolver feeds materials, and acquiring the pulse counting rate N corresponding to the gamma rays entering the second detection system in a set energy interval2；
The data processor is used for counting the pulse counting rate N according to the pulse1Calculating the number n of fuel stubs passing the top of the hopper chute1And according to said pulse count rate N2Calculating the number n of fuel stubs passing through the bottom of the feed hopper chute2And also for determining n1And n2If the difference is larger than the set value, when the judgment result is 'yes', an alarm signal of the blockage of the feed hopper of the spent fuel dissolver is output.
7. The passive monitoring system for the blockage of the feed hopper of the spent fuel dissolver according to claim 6, wherein the first detection system comprises a first detector and a first signal analysis processing system,
the first detector is used for receiving gamma rays entering the first detector and converting the gamma rays into pulse signals to be output,
the first signal analysis and processing system is electrically connected with the first detector and is used for receiving the pulse signal output by the first detector and processing the pulse signal to obtain the set energy of the gamma ray in the first detectorPulse count rate N corresponding to the volume interval1。
8. The passive monitoring system for the blockage of the feed hopper of the spent fuel dissolver according to claim 6, characterized in that the second detection system comprises a second detector and a second signal analysis processing system,
the second detector is used for receiving the gamma rays entering the second detector and converting the gamma rays into pulse signals to be output,
the second signal analysis and processing system is electrically connected with the second detector and is used for receiving the pulse signal output by the second detector and processing the pulse signal to obtain a pulse counting rate N corresponding to the gamma ray in the second detector in a set energy interval2。
9. The passive monitoring system for the blockage of the feed hopper of the spent fuel dissolver according to any one of claims 6 to 8, characterized in that the data processor comprises a calculation module and a comparison module,
the calculation module is used for calculating the pulse counting rate N according to a relational expression of the pulse counting rate N and the number N of the fuel short rods stored in the calculation module1Number n of corresponding fuel stubs passing the top of the feed hopper chute1And calculating and pulse counting rate N2Number n of corresponding fuel stubs passing the bottom of the feed hopper chute2，
The comparison module is used for judging n1And n2If the difference is larger than the set value, when the judgment result is 'yes', an alarm signal of the blockage of the feed hopper of the spent fuel dissolver is output.
10. The passive monitoring system for the blockage of the feed hopper of the spent fuel dissolver according to claim 9, characterized in that the pulse counting rate N is related to the number N of the fuel short rods as shown in formula (1):
n＝N/(a·M·K) (1)
n-represents the number of fuel stubs;
n-represents the pulse count rate obtained by the detection system;
k represents the detection efficiency of the detection system for detecting the gamma rays;
a-represents the specific activity of the fuel short rod;
m-represents the mass of each fuel rod.
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