CN114152992B - 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
- Publication number
- CN114152992B CN114152992B CN202111457544.7A CN202111457544A CN114152992B CN 114152992 B CN114152992 B CN 114152992B CN 202111457544 A CN202111457544 A CN 202111457544A CN 114152992 B CN114152992 B CN 114152992B
- Authority
- CN
- China
- Prior art keywords
- feed hopper
- fuel
- detector
- dissolver
- gamma rays
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000002915 spent fuel radioactive waste Substances 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000012544 monitoring process Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 82
- 239000000446 fuel Substances 0.000 claims abstract description 78
- 238000012545 processing Methods 0.000 claims description 42
- 238000004458 analytical method Methods 0.000 claims description 30
- 230000000694 effects Effects 0.000 claims description 6
- 230000003321 amplification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005251 gamma ray Effects 0.000 description 2
- 238000005259 measurement Methods 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
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- 238000010008 shearing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- High Energy & Nuclear Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Geophysics (AREA)
- Measurement Of Radiation (AREA)
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 method comprises the steps that detection systems are arranged at positions close to the top and the bottom of a feed hopper chute of a spent fuel dissolver, and when the spent fuel dissolver is fed, the two detection systems respectively detect gamma rays emitted by fuel short rods passing through the top and the bottom of the feed hopper chute and respectively acquire pulse count rates N 1 and N 2 corresponding to the gamma rays entering the detection systems in a set energy interval; and calculating the number N 1 of the fuel short rods passing through the top of the feed hopper chute according to the pulse counting rate N 1, calculating the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute according to the pulse counting rate N 2, and accurately judging that the feed hopper of the spent fuel dissolver is blocked when the difference between N 1 and N 2 is larger than a set value.
Description
Technical Field
The invention particularly relates to a passive monitoring method and system for blockage of a feed hopper of a spent fuel dissolver.
Background
The passive monitoring device for blocking the feed hopper of the spent fuel dissolver is key equipment for ensuring the normal operation process of the spent fuel dissolver. In the spent fuel aftertreatment process, the fuel rod is sheared into short segments of fuel about 20-50mm in length, passing through a chute into one of 14 scoops in a dissolver. The dissolver is then rotated counter-clockwise, causing the fuel in the short segment of fuel in the bucket to be sufficiently dissolved in the nitric acid solution and removed from the dissolver through the discharge chute.
Because the spent fuel dissolver contains a large amount of radioactive substances, in order to ensure the safety of the dissolution process, the blockage monitoring of the feeding hopper of the dissolver is required 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 totally enclosed and the radioactivity level is extremely high, personnel cannot approach to monitoring by adopting a conventional method.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, provides an automatic and accurate passive monitoring method for blockage of a feed hopper of a spent fuel dissolver, and correspondingly provides a system for realizing the method.
The technical scheme adopted for solving the technical problems 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 a position close to the top of a feed hopper chute of the spent fuel dissolver, a second detection system is arranged at a position close to the bottom of the feed hopper chute of the spent fuel dissolver,
S2: when the spent fuel dissolver is fed, a first detection system detects gamma rays emitted by a fuel short rod passing through the top of a feed hopper chute, and obtains pulse counting rate N 1 corresponding to the gamma rays entering the first detection system in a set energy interval; the second detection system detects gamma rays emitted by the fuel short rod passing through the bottom of the feed hopper chute, and acquires pulse counting rate N 2 corresponding to the gamma rays entering the second detection system in a set energy interval;
s3: and calculating the number N 1 of the fuel short rods passing through the top of the feed hopper chute according to the pulse counting rate N 1, calculating the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute according to the pulse counting rate N 2, and judging that the feed hopper of the spent fuel dissolver is blocked when the difference between N 1 and N 2 is larger than a set value.
Alternatively, n 1 and n 2 are calculated separately using 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 gamma rays;
a-represents the specific activity of the fuel rod;
M-represents the mass of each fuel rod.
Optionally, step S3 is implemented with a data processor, which comprises a calculation module and a comparison module,
The calculation module calculates the number N 1 of the fuel short rods passing through the top of the feed hopper chute corresponding to the pulse counting rate N 1 according to the formula (1) stored in the calculation module, and calculates the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute corresponding to the pulse counting rate N 2,
The comparison module judges whether the difference between n 1 and n 2 is larger than a set value, and outputs an alarm signal of blockage of the feed hopper of the spent fuel dissolver when the judgment result is yes.
Optionally, the first detection system comprises a first detector and a first signal analysis processing system, the first signal analysis processing system being electrically connected to the first detector,
The first detector receives the gamma rays entering the first detector and converts the gamma rays into pulse signals 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 count rate N 1 corresponding to the gamma rays in the first detector in a set energy interval.
Optionally, the second detection system comprises a second detector and a second signal analysis processing system, the second signal analysis processing system being electrically connected to the second detector,
The second detector receives the gamma rays entering the second detector and converts the gamma rays into pulse signals to be output,
The second signal analysis processing system receives the pulse signal output by the second detector and processes the pulse signal to obtain a pulse count rate N 2 corresponding to the gamma rays in the second detector in a set energy interval.
The invention also provides a passive monitoring system for blockage of the feed hopper of the spent fuel dissolver, which comprises: the first detection system, the second detection system and the data processor are electrically connected with each other,
The first detection system is arranged at a position close to the top of the 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 is fed, and acquiring pulse count rate N 1 corresponding to the gamma rays entering the first detection system in a set energy interval; the second detection system is used for detecting gamma rays emitted by the fuel short rod passing through the bottom of the feed hopper chute when the spent fuel dissolver is fed, and acquiring pulse count rate N 2 corresponding to the gamma rays entering the second detection system in a set energy interval;
The data processor is used for calculating the number N 1 of the fuel short rods passing through the top of the feed hopper chute according to the pulse counting rate N 1, calculating the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute according to the pulse counting rate N 2, and outputting an alarm signal of blockage of the feed hopper of the spent fuel dissolver when the judgment result is yes when the difference between N 1 and N 2 is larger than a set value.
Optionally, the first detection system comprises a first detector and a first signal analysis processing system,
The first detector is used for receiving the 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 signal output by the first detector and processing the pulse signal to obtain a pulse counting rate N 1 corresponding to the gamma rays in the first detector in a set energy interval.
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 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 2 corresponding to the gamma rays in the second detector in a set energy interval.
Optionally, the data processor comprises a calculation module and a comparison module,
The calculation module is used for calculating the number N 1 of the fuel short rods passing through the top of the feed hopper chute corresponding to the pulse counting rate N 1 according to the relation between the pulse counting rate N and the number N of the fuel short rods stored in the calculation module, and calculating the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute corresponding to the pulse counting rate N 2,
The comparison module is used for judging whether the difference value between n 1 and n 2 is larger than a set value, and outputting an alarm signal of blockage of the feed hopper of the spent fuel dissolver when the judgment result is yes.
Optionally, the relation between the pulse count rate N and the number of fuel rods N is 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 gamma rays;
a-represents the specific activity of the fuel rod;
M-represents the mass of each fuel rod.
According to 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 is fed, gamma rays emitted by fuel stubs passing through the top and the bottom of the feed hopper chute are respectively detected by the two detection systems, and the pulse count rate corresponding to the gamma rays entering the gamma rays in a set energy interval is obtained through processing.
Drawings
FIG. 1 is a side view of a spent fuel dissolver feed hopper;
FIG. 2 is a layout diagram of a spent fuel dissolver feed hopper blockage passive monitoring detector;
FIG. 3 is a flow chart of a method of passive monitoring of spent fuel dissolver feed hopper blockage;
FIG. 4 is a schematic diagram of the connection of the detection system to the data processor.
Detailed Description
The following description of the embodiments of the present invention will be made more apparent, and the embodiments described in detail, but not necessarily all, in connection with the accompanying drawings. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be noted that the orientation or positional relationship indicated by "upper" or the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience and simplicity of description, and is not meant to indicate or imply that the apparatus or element to be referred to must be provided with a specific orientation, be configured 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," "second," 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 should be noted that, unless explicitly specified and limited otherwise, the terms "connected," "configured," "mounted," "secured," and the like are to be construed broadly and may be either fixedly connected or detachably connected, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood by those skilled in the art in specific cases.
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 a position close to the top of a feed hopper chute of the spent fuel dissolver, a second detection system is arranged at a position close to the bottom of the feed hopper chute of the spent fuel dissolver,
S2: when the spent fuel dissolver is fed, a first detection system detects gamma rays emitted by a fuel short rod passing through the top of a feed hopper chute, and obtains pulse counting rate N 1 corresponding to the gamma rays entering the first detection system in a set energy interval; the second detection system detects gamma rays emitted by the fuel short rod passing through the bottom of the feed hopper chute, and acquires pulse counting rate N 2 corresponding to the gamma rays entering the second detection system in a set energy interval;
s3: and calculating the number N 1 of the fuel short rods passing through the top of the feed hopper chute according to the pulse counting rate N 1, calculating the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute according to the pulse counting rate N 2, and judging that the feed hopper of the spent fuel dissolver is blocked when the difference between N 1 and N 2 is larger than a set value.
The invention also provides a passive monitoring system for blockage of the feed hopper of the spent fuel dissolver, which comprises: the first detection system, the second detection system and the data processor are electrically connected with each other,
The first detection system is arranged at a position close to the top of the 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 is fed, and acquiring pulse count rate N 1 corresponding to the gamma rays entering the first detection system in a set energy interval; the second detection system is used for detecting gamma rays emitted by the fuel short rod passing through the bottom of the feed hopper chute when the spent fuel dissolver is fed, and acquiring pulse count rate N 2 corresponding to the gamma rays entering the second detection system in a set energy interval;
The data processor is used for calculating the number N 1 of the fuel short rods passing through the top of the feed hopper chute according to the pulse counting rate N 1, calculating the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute according to the pulse counting rate N 2, and outputting an alarm signal of blockage of the feed hopper of the spent fuel dissolver when the judgment result is yes when the difference between N 1 and N 2 is larger than a set value.
Example 1:
During the dissolver feed, the fuel rods are cut by a shears into short segments of fuel of about 20-50mm in length, as shown in fig. 1 and 3, which fall along 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 feed 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 feed hopper chute 41 of the spent fuel dissolver 4,
S2: when the spent fuel dissolver 4 is fed, 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 obtains pulse count rate N 1 corresponding to the gamma rays entering the first detection system in a set energy interval; the second detection system 2 detects the gamma rays emitted by the fuel short rod passing through the bottom of the feed hopper chute 41 and acquires the pulse count rate N 2 corresponding to the gamma rays entering the gamma rays in a set energy interval;
S3: and calculating the number N 1 of the fuel short rods passing through the top of the feed hopper chute 41 according to the pulse counting rate N 1, calculating the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute 41 according to the pulse counting rate N 2, and judging that the feed hopper of the spent fuel dissolver is blocked when the difference between N 1 and N 2 is larger than a set value.
The highest of the radioactivity of spent fuel is 137 Cs, and in theory, 137 Cs activity can be measured by measuring the net count of 662keV gamma peaks of 137 Cs. Thus, in this embodiment, the set energy interval is selected to be 60keV to 3MeV.
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 levels measured by the detection systems at the top and the bottom of the chute are detected, the pulse count rate corresponding to the gamma rays entering the chute in a set energy interval is obtained through processing, the sliding state of the fuel short section is monitored by comparing the pulse count rates corresponding to the top and the bottom of the chute, so that the continuity of the transmission of the fuel short section is monitored, and the cut fuel short section is ensured not to 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 corresponding pulse counting rates at the top and the bottom.
In this example, n 1 and n 2 are calculated using formula (1), respectively:
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 gamma rays;
a-represents the specific activity of the fuel rod;
M-represents the mass of each fuel rod.
In this embodiment, one fuel rod is sheared into 100 fuel stubs.
In the calculation process, the radioactivity of the short fuel section before passing through the shielding body can be detected through a half-value layer method, K, a is a known constant after the object to be measured and the detector are selected, and the known quantity of M before the spent fuel rod is transported into the chute, so that the quantity of the short fuel section entering the chute can be accurately calculated.
In this embodiment, step S3 is implemented using a data processor 3, the data processor 3 comprising a calculation module 31 and a comparison module 32,
The calculation module 31 calculates the number N 1 of fuel stubs passing through the top of the hopper chute corresponding to the pulse count rate N 1, and calculates the number N 2 of fuel stubs passing through the bottom of the hopper chute corresponding to the pulse count rate N 2, according to equation (1) stored therein,
The comparison module 32 judges whether the difference between n 1 and n 2 is larger than a set value, and outputs an alarm signal of blockage of the feed hopper of the spent fuel dissolver when the judgment result is yes.
In this embodiment, the first detection system 1 comprises a first detector 11 and a first signal analysis processing system 12, the first signal analysis processing system 12 being electrically connected to the first detector 11,
The first detector 11 receives the gamma rays entered therein, and converts them into a pulse signal output,
The first signal analysis 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 1 corresponding to the gamma ray in the first detector 11 in the set energy interval.
Referring to fig. 4, the first signal analysis 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, said second signal analysis processing system 22 being electrically connected to the second detector 21,
The second detector 21 receives the gamma rays entered therein, and converts into a pulse signal output,
The second signal analysis 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 2 corresponding to the gamma ray in the second detector 21 in the set energy interval.
Referring to fig. 4, the second signal analysis 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, 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.
For each cut of the shearing machine, the passive monitoring system for the blockage of the feeding hopper can perform the following operations:
(a) The first detector 11 receives the gamma rays entering it and the second detector 21 delays receiving the gamma rays entering it.
(B) The first signal analysis processing system 12 analyzes the radiometric signal triggered by the fuel stubs at the top of the chute.
(C) The second signal analysis processing system 22 analyzes the radiometric signal where the fuel stubs at the bottom of the chute are triggered.
(D) The data processor 3 (computer) calculates the number of the fuel short rods at the top and the bottom of the chute respectively, compares whether the measured values of the two signals are equal, and accordingly judges whether the fuel short rods slide down smoothly, and blockage monitoring in the chute is achieved.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and 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, which is characterized by comprising the following steps:
s1: a first detection system is arranged at a position close to the top of a feed hopper chute of the spent fuel dissolver, a second detection system is arranged at a position close to the bottom of the feed hopper chute of the spent fuel dissolver,
S2: when the spent fuel dissolver is fed, a first detection system detects gamma rays emitted by a fuel short rod passing through the top of a feed hopper chute, and obtains pulse counting rate N 1 corresponding to the gamma rays entering the first detection system in a set energy interval; the second detection system detects gamma rays emitted by the fuel short rod passing through the bottom of the feed hopper chute, and acquires pulse counting rate N 2 corresponding to the gamma rays entering the second detection system in a set energy interval;
s3: and calculating the number N 1 of the fuel short rods passing through the top of the feed hopper chute according to the pulse counting rate N 1, calculating the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute according to the pulse counting rate N 2, and judging that the feed hopper of the spent fuel dissolver is blocked when the difference between N 1 and N 2 is larger than a set value.
2. The passive monitoring method of spent fuel dissolver feed hopper blockage according to claim 1, wherein n 1 and n 2 are calculated using formula (1) respectively:
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 gamma rays;
a-represents the specific activity of the fuel 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, wherein the step S3 is realized by adopting a data processor, the data processor comprises a calculation module and a comparison module,
The calculation module calculates the number N 1 of the fuel short rods passing through the top of the feed hopper chute corresponding to the pulse counting rate N 1 according to the formula (1) stored in the calculation module, and calculates the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute corresponding to the pulse counting rate N 2,
The comparison module judges whether the difference between n 1 and n 2 is larger than a set value, and outputs an alarm signal of blockage of the feed hopper of the spent fuel dissolver when the judgment result is yes.
4. The passive monitoring method for the blockage of the feed hopper of the spent fuel dissolver, which is characterized in that,
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 rays entering the first detector and converts the gamma rays into pulse signals 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 count rate N 1 corresponding to the gamma rays in the first detector in a set energy interval.
5. The passive monitoring method for the blockage of the feed hopper of the spent fuel dissolver according to any one of claims 1-3, wherein 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 rays entering the second detector and converts the gamma rays into pulse signals to be output,
The second signal analysis processing system receives the pulse signal output by the second detector and processes the pulse signal to obtain a pulse count rate N 2 corresponding to the gamma rays in the second detector in a set energy interval.
6. A passive monitoring system for spent fuel dissolver feed hopper blockage, comprising: the first detection system, the second detection system and the data processor are electrically connected with each other,
The first detection system is arranged at a position close to the top of the 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 is fed, and acquiring pulse count rate N 1 corresponding to the gamma rays entering the first detection system in a set energy interval; the second detection system is used for detecting gamma rays emitted by the fuel short rod passing through the bottom of the feed hopper chute when the spent fuel dissolver is fed, and acquiring pulse count rate N 2 corresponding to the gamma rays entering the second detection system in a set energy interval;
The data processor is used for calculating the number N 1 of the fuel short rods passing through the top of the feed hopper chute according to the pulse counting rate N 1, calculating the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute according to the pulse counting rate N 2, and outputting an alarm signal of blockage of the feed hopper of the spent fuel dissolver when the judgment result is yes when the difference between N 1 and N 2 is larger than a set value.
7. The passive monitoring system of the blockage of the feed hopper of the spent fuel dissolver of 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 the 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 signal output by the first detector and processing the pulse signal to obtain a pulse counting rate N 1 corresponding to the gamma rays in the first detector in a set energy interval.
8. The passive monitoring system for the blockage of the feed hopper of the spent fuel dissolver of claim 6, wherein 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 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 2 corresponding to the gamma rays in the second detector in a set energy interval.
9. The passive monitoring system of spent fuel dissolver feed hopper blockage according to any one of claims 6-8, wherein the data processor comprises a calculation module and a comparison module,
The calculation module is used for calculating the number N 1 of the fuel short rods passing through the top of the feed hopper chute corresponding to the pulse counting rate N 1 according to the relation between the pulse counting rate N and the number N of the fuel short rods stored in the calculation module, and calculating the number N 2 of the fuel short rods passing through the bottom of the feed hopper chute corresponding to the pulse counting rate N 2,
The comparison module is used for judging whether the difference value between n 1 and n 2 is larger than a set value, and outputting an alarm signal of blockage of the feed hopper of the spent fuel dissolver when the judgment result is yes.
10. The passive monitoring system of spent fuel dissolver feed hopper plugging in accordance with claim 9, wherein the relationship of pulse count rate N to number of fuel stubs N is shown in equation (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 gamma rays;
a-represents the specific activity of the fuel rod;
M-represents the mass of each fuel rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111457544.7A CN114152992B (en) | 2021-12-01 | 2021-12-01 | Passive monitoring method and system for blockage of feed hopper of spent fuel dissolver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111457544.7A CN114152992B (en) | 2021-12-01 | 2021-12-01 | Passive monitoring method and system for blockage of feed hopper of spent fuel dissolver |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114152992A CN114152992A (en) | 2022-03-08 |
| CN114152992B true CN114152992B (en) | 2024-04-26 |
Family
ID=80455822
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111457544.7A Active CN114152992B (en) | 2021-12-01 | 2021-12-01 | Passive monitoring method and system for blockage of feed hopper of spent fuel dissolver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114152992B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101078374A (en) * | 2007-07-05 | 2007-11-28 | 东北大学 | Fuel pressure controlling device and controlling method for mini combustion turbine |
| CN109100772A (en) * | 2018-08-08 | 2018-12-28 | 中国原子能科学研究院 | A kind of on-line analysis monitoring method and device for spentnuclear fuel course of dissolution |
| CN110860452A (en) * | 2019-11-26 | 2020-03-06 | 二重（德阳）重型装备有限公司 | Spent fuel screening device |
| CN111736202A (en) * | 2020-05-25 | 2020-10-02 | 中国核电工程有限公司 | Multichannel-based passive detection control system and method for abundance of fuel rods |
| WO2021120697A1 (en) * | 2019-12-21 | 2021-06-24 | 苏州瑞派宁科技有限公司 | Pulse radiation detection circuit and apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7765978B2 (en) * | 2005-08-26 | 2010-08-03 | Liquid Controls Corporation | Differential pressure sensor for fuel delivery systems |
-
2021
- 2021-12-01 CN CN202111457544.7A patent/CN114152992B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101078374A (en) * | 2007-07-05 | 2007-11-28 | 东北大学 | Fuel pressure controlling device and controlling method for mini combustion turbine |
| CN109100772A (en) * | 2018-08-08 | 2018-12-28 | 中国原子能科学研究院 | A kind of on-line analysis monitoring method and device for spentnuclear fuel course of dissolution |
| CN110860452A (en) * | 2019-11-26 | 2020-03-06 | 二重（德阳）重型装备有限公司 | Spent fuel screening device |
| WO2021120697A1 (en) * | 2019-12-21 | 2021-06-24 | 苏州瑞派宁科技有限公司 | Pulse radiation detection circuit and apparatus |
| CN111736202A (en) * | 2020-05-25 | 2020-10-02 | 中国核电工程有限公司 | Multichannel-based passive detection control system and method for abundance of fuel rods |
Non-Patent Citations (1)
| Title |
|---|
| 废包壳中铀钚含量的γ分析方法研究;邵婕文;柏磊;刘晓琳;;中国原子能科学研究院年报;20180630(第00期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114152992A (en) | 2022-03-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7411199B2 (en) | Method and apparatus for coincidence imaging digital triggering | |
| EP2113791A1 (en) | Sodium iodide sctinitllator with flat plastic scintillator for Compton suppression | |
| CN103197338A (en) | Underwater radiation monitoring method and system | |
| CN102169735A (en) | Nuclear power station fuel rod breakage on-line detection system | |
| EP2762923B1 (en) | Radiation meter | |
| US4049966A (en) | Nuclear radiation measuring method and apparatus having blanking time inversely related to count rate | |
| CN110703308B (en) | Critical alarm device and system | |
| EP3125000B1 (en) | Radiation monitor | |
| KR101581004B1 (en) | Radiation detecting system for incoming and outgoing system vehicles | |
| JP5487173B2 (en) | Radionuclide analyzer and its coincidence coincidence suppression method | |
| CN114152992B (en) | Passive monitoring method and system for blockage of feed hopper of spent fuel dissolver | |
| CN103995015A (en) | Explosive detection device | |
| CN106019354B (en) | Artificial radionuclide concentration monitoring method and device | |
| RU89752U1 (en) | COMPLEX OF CONTROL OF INTERNAL STRUCTURE OF FUEL ELEMENTS | |
| CN206710614U (en) | The measuring system of radioactivity inert gas | |
| CN103730173B (en) | A kind of judge to let out under nuclear power plant reactor the method in fission product source in pipeline | |
| JP2007225507A (en) | Radioactivity inspection method and device | |
| CN114152969B (en) | Bucket unloading active monitoring method and system for spent fuel dissolver | |
| CA2425244C (en) | Method for reduction of the statistical measurement times in the field of radioactivity measurement | |
| CN114188050B (en) | Passive monitoring method and system for undissolved fuel ratio of spent fuel dissolver | |
| JP2019219251A (en) | Radiation measurement device | |
| US4837437A (en) | Method and circuit arrangement for reducing the background count in radioactivity measurements with a coincidence-anticoincidence evaluation | |
| US9739893B2 (en) | Method for detecting a moving radioactive source and associated device | |
| CN112601983A (en) | Electronic dosimeter for generating an alarm in a pulsed radiation field | |
| CN215005887U (en) | Fixed measuring device for depth position with directional dose equivalent rate of 7mm |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |