CN113486468B - Method for calculating weight of potential fragments in containment vessel of nuclear power plant - Google Patents
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- 239000012634 fragment Substances 0.000 title claims abstract description 178
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005070 sampling Methods 0.000 claims abstract description 50
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 9
- 238000009423 ventilation Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 238000013461 design Methods 0.000 abstract description 14
- 238000012552 review Methods 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000003973 paint Substances 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
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Abstract
The invention relates to the technical field of nuclear safety, in particular to a method for calculating the weight of potential fragments in a containment vessel of a nuclear power plant, which comprises the following steps that L1 samples the potential fragments of each object at a sampling point; l2, classifying the potential fragments sampled by each item in a mode of sampling according to the whole, sampling according to the length and sampling according to the area, calculating the weight of the potential fragments sampled according to the whole in unit number, calculating the weight of the potential fragments sampled according to the length in unit area, and calculating the weight of the potential fragments sampled according to the area in unit area; l3 obtains actual information for all potential patches for each item class, including the total number of potential patches sorted in an overall manner. The method can quantitatively calculate the total weight of potential fragments in the containment, is convenient for rechecking the filter screen design of a newly built nuclear power plant, or provides more accurate fragment content data for the filter screen reconstruction of the established nuclear power plant.
Description
Technical Field
The invention relates to the technical field of nuclear safety, in particular to a method for calculating the weight of potential fragments in a containment vessel of a nuclear power plant.
Background
In order to cope with the break loss of water accident, the nuclear power plant is provided with an emergency core cooling system and a containment heat rejection system. The emergency reactor core cooling system is used for injecting boron-containing water into the first loop after an accident, maintaining the reactor core water level, and ensuring the reactor core to be sufficiently cooled without damage; the heat removal system of the containment vessel can take away heat in the containment vessel after an accident, and prevent the structural integrity of the containment vessel from being influenced by over-temperature and over-pressure. In addition, the bottom layer of the containment is provided with a pit, and when the injection water source of the safety system is exhausted, the pit can be used for recycling fluid in the containment to ensure continuous cooling of the reactor core. A filter screen is arranged at the pit of the containment vessel and used for intercepting sundries and fragments in the containment vessel and preventing the substances from causing the performance reduction of the components of the safety system and failing to fulfill the expected safety function.
In view of the occurrence of clogging of the filter screen of the emergency core cooling system by excessive debris from foreign nuclear power plants, regulatory authorities have been concerned about the problem of clogging of the filter screen. The sources of the fragments in the power plant are mainly 3: potential fragments within the containment, paint fragments, chemical fragments. Potential debris includes dust, fluff, debris, sand, gravel, dirt, and the like that are difficult to remove completely; paint fragments are generated by falling off of valves, pipelines, structures or building coatings; chemical debris is chemical precipitation that occurs as a result of the reaction of materials within the containment after an accident.
The energy bureau issued the standard of filter design and performance evaluation of pressurized water reactor nuclear power plant emergency core cooling system in 2018, and requires: the filter screen of the in-service nuclear power plant is transformed, and a fragment source step is required to be surveyed and used as the input of filter design; for a newly built nuclear power plant, the information of fragment source items is required to be given according to reference power plant data or design analysis and statistics, and the analysis result is subjected to stepping investigation and rechecking after the construction of the nuclear power plant is completed. Wherein the function of the debris source step in the filter reconstruction and design review process is shown in fig. 1.
In the fragment source item, the weights of the paint fragments and the chemical fragments can be determined according to actual situation statistics and analysis. While potential fragments need to be sampled and analyzed for design review. Although the survey workflow is well-suited, there is no effective solution provided in the standards and in the prior art how to process the potential fragment sampling data therein and thereby quantitatively calculate the total amount of potential fragments within the containment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for calculating the weight of potential fragments in the containment vessel of the nuclear power plant, which is convenient for processing and analyzing the sampling data of the potential fragments in the containment vessel, and can further provide reference for the fragment source stepping work required to be developed for the follow-up newly-built unit and the reconstruction of the filter screen of the built power plant.
The technical scheme adopted for solving the technical problems is as follows: a method for calculating the weight of potential debris in a containment vessel of a nuclear power plant, comprising the steps of,
l1 samples potential fragments of each item at a sampling point;
l2, classifying the potential fragments sampled by each item in a mode of sampling according to the whole, sampling according to the length and sampling according to the area, calculating the weight of the potential fragments sampled according to the whole in unit number, calculating the weight of the potential fragments sampled according to the length in unit area, and calculating the weight of the potential fragments sampled according to the area in unit area;
l3 obtaining actual information of all potential fragments of each item, wherein the actual information comprises the total number of potential fragments classified in an overall manner, the total area of potential fragments classified in a length manner and the total area of potential fragments classified in an area manner;
l4 calculating a first weight of the potential fragments classified in an overall manner, a second weight of the potential fragments classified in a length manner, a third weight of the potential fragments classified in an area manner in each item class, and calculating the total weight of the potential fragments in each item class by the first weight, the second weight and the third weight;
l5 calculates the total weight of potential fragments of all item classes.
The method can quantitatively calculate the total weight of the potential fragments in the containment through processing and analyzing the sampling data of the potential fragments in the containment, so as to provide reference for fragment source stepping work required to be carried out for the follow-up newly-built unit and the filter screen reconstruction of the built power plant, facilitate the review of the filter screen design of the newly-built nuclear power plant, or provide more accurate fragment content data for the filter screen reconstruction of the built nuclear power plant, so that the input of the filter screen design is more accurate.
Preferably, in the L4, the weight of the potential fragments classified in the whole manner in each item is calculated by the formula 1),
wherein q 1 Is of weight one, N 1 For the total number of potential fragments in an item class, n 1 M is the sampling number of potential fragments sampled in whole in a certain object class i The sample weight of potential fragments in one item as a whole.
Preferably, in the L4, the weight of the potential fragments classified in the length manner in each item is calculated by the formula 2) by two,
wherein q 2 Is of weight two, A 1 For the total area, n, of potential fragments of an item class, classified by length 2 For the sampling number, M, of potential fragments sampled by length in an item class 2-i For the sample weight, D, of potential fragments sampled by length in a certain item class i Sample diameter, L, for potential fragments sampled by length in an item class i The sample length for a potential fragment sampled in length in an item class.
Preferably, in the L4, the weight three is calculated for the potential fragments classified by area in each item through the formula 3),
wherein q 3 Weight three, A 2 For the total area, n, of the area-wise classified potential fragments in an item class 3 For the sampling number, M, of the potential fragments sampled by area in a certain object class 3-i Sample weight for potential fragments sampled by area in a certain item class, B 3-i Sample area for potential fragments sampled by area in a certain item class.
Preferably, in L4, the total weight of potential fragments in each item is calculated by equation 4),
Q i ＝q 1 +q 2 +q 3 4)
wherein Q is i Q is the total weight of potential fragments in an item class 1 Weight one, q for potential fragments of an item class classified in an overall manner 2 Two, q, the weights of potential fragments classified by length in a certain item class 3 Three weights of potential fragments classified by area in a certain item class.
Preferably, the items include valve items, process pipeline and support and hanger items, mechanical module items, engineering equipment items, electrical items, communication items, instrument items, electromechanical items, building items, structural items, heating and ventilation items and water supply and drainage items.
Preferably, the valve items comprise various valves; the process pipeline and support and hanger items comprise various process pipelines and process support and hanger; the mechanical module object items comprise various mechanical modules; the engineering equipment item class comprises various engineering equipment; the electric items comprise a pull box, a support hanger, a first cable, a cable guide pipe, a cable bridge and a lamp; the communication items comprise a communication and fire alarm system pipeline, a loudspeaker, a telephone, a wiring terminal box and a fire alarm module; the instrument items comprise instruments, a mounting bracket, an instrument pipe, a cable piping and a first cabinet; the electromechanical items comprise a device junction box, a second cable and a second cabinet; the building items comprise various rooms and various elevators; the structural items comprise various steel platforms, grating plates and elevator shaft modules; the heating and ventilation items comprise various heating and ventilation system pipelines and support hangers; the water supply and drainage items comprise various water supply and drainage system pipelines and support and hanging frames.
Preferably, in said L5, the total weight of potential fragments of all species is calculated by equation 5),
wherein Q is the total weight of potential fragments of all the item classes, Q i Is the total weight of potential fragments in a certain item.
Preferably, the sampling point is positioned in a presumed break position, an affected area and a special area in the shell after the water loss accident.
Preferably, the number of potential fragments sampled in whole is not less than 10 pieces per item class, and/or the number of potential fragments sampled in length is not less than 7 pieces, and/or the number of potential fragments sampled in area is not less than 5 pieces.
Advantageous effects
The method can quantitatively calculate the total weight of the potential fragments in the containment through processing and analyzing the sampling data of the potential fragments in the containment, so as to provide reference for fragment source stepping work required to be carried out for the follow-up newly-built unit and the filter screen reconstruction of the built power plant, facilitate the review of the filter screen design of the newly-built nuclear power plant, or provide more accurate fragment content data for the filter screen reconstruction of the built nuclear power plant, so that the input of the filter screen design is more accurate.
Drawings
FIG. 1 is a flow chart of a prior art filter retrofit and design review;
FIG. 2 is a schematic diagram of a classification table of all item classes of potential patches of the present invention.
Detailed Description
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
A method for calculating the weight of potential debris in a containment vessel of a nuclear power plant, comprising the steps of,
l1 samples potential fragments of each item at a sampling point.
The sampling points for potential fragments may be assumed breach locations, areas of impact, and special areas within the shell after a loss of water accident. Potential shards can be categorized into 12 classes, each of which contains items as shown in FIG. 2. To ensure the representativeness and accuracy of the survey results, the sampling points should be guaranteed to have a sufficient number of potential fragments that can contain various items.
The items comprise a valve item, a process pipeline and support hanger item, a mechanical module item, an engineering equipment item, an electric item, a communication item, an instrument item, an electromechanical item, a building item, a structural item, a heating and ventilation item and a water supply and drainage item.
The valve items comprise various valves; the process pipeline and support and hanger items comprise various process pipelines and process support and hanger; the mechanical module object items comprise various mechanical modules; the engineering equipment item class comprises various engineering equipment; the electric items comprise a pull box, a support hanger, a first cable, a cable guide pipe, a cable bridge and a lamp; the communication items comprise a communication and fire alarm system pipeline, a loudspeaker, a telephone, a wiring terminal box and a fire alarm module; the instrument items comprise instruments, a mounting bracket, an instrument pipe, a cable piping and a first cabinet; the electromechanical items comprise a device junction box, a second cable and a second cabinet; the building items comprise various rooms and various elevators; the structural items comprise various steel platforms, grating plates and elevator shaft modules; the heating and ventilation items comprise various heating and ventilation system pipelines and support hangers; the water supply and drainage items comprise various water supply and drainage system pipelines and support and hanging frames.
And L2, classifying the potential fragments sampled by each item in a mode of sampling by the whole, sampling by the length and sampling by the area, calculating the weight of the potential fragments sampled by the whole in unit number, calculating the weight of the potential fragments sampled by the length in unit area, and calculating the weight of the potential fragments sampled by the area in unit area.
For example, for valve items, each type of valve may be sampled in an overall sampling manner, with the number of samples for each type of valve being no less than 10.
For instrument items, the instrument and the mounting bracket can be sampled in an integral sampling mode, the instrument pipe and the cable pipe are sampled in a length sampling mode, and the first cabinet is sampled in an area sampling mode. And the sampling number of the instrument and the mounting bracket is not less than 10, the sampling number of the instrument pipe and the cable pipe is not less than 7, and the sampling number of the first cabinet is not less than 5.
For structural items, various steel platforms, grating plates and elevator shaft modules can be sampled in an area sampling mode. And the sampling number of various steel platforms, grating plates and elevator shaft modules is not less than 5.
For water supply and drainage items, the drainage system pipeline can be sampled in a length sampling mode, and the support and the hanger are sampled in an area sampling mode. And the sampling number of the drainage system pipelines is not less than 7, and the sampling number of the supporting and hanging frames is not less than 5.
In a word, for process piping, water supply and drainage piping, cable one, cable two, cable conduit, communication and fire alarm system pipelines, etc., sampling is performed according to the length; sampling the surface of a large-scale support and hanger, the ground, the wall surface, the grille, the surface of a large-scale device and the like according to the area; for small mechanical and electrical/instrument control devices such as valves, meters, wire boxes, telephones, etc., the sample is taken as a whole.
When the weight calculation of the unit number is needed for the potential fragments of the subclass sampled in the whole way in a certain item class, the weight of all the potential fragments of the subclass is only added together and then divided by the number of all the potential fragments of the subclass. Note that the potential fragments herein are for the sampled potential fragments only.
When the weight calculation of a unit length is needed for the potential fragments of a subclass sampled in a length manner in a certain item class, the weight of all the potential fragments of the subclass is simply added together and then divided by the area of all the potential fragments of the subclass (wherein the area is obtained by multiplying the length of the potential fragments by the perimeter of the potential fragments). Note that the potential fragments herein are for the sampled potential fragments only.
When the weight calculation of a unit area is needed for the potential fragments of the sub-class sampled in an area mode in a certain item class, the weight of all the potential fragments of the sub-class is only added together and then divided by the area of all the potential fragments of the sub-class. Note that the potential fragments herein are for the sampled potential fragments only.
To this end, the weight per unit number of sub-classes sampled in an overall manner or the weight per unit area of sub-classes sampled in a length manner or the weight per unit area of sub-classes sampled in an area manner in each item class has been determined.
L3 obtains actual information for all potential patches for each item class, including the total number of potential patches classified in an overall manner, the total area of potential patches classified in a length manner, and the total area of potential patches classified in an area manner.
Note that the potential fragments herein refer to all fragments within the containment of the nuclear power plant, not just the potential fragments sampled.
For example, for a valve item class, the actual information that needs to be obtained includes the total number of all valves.
For process piping and hanger items, the actual information that needs to be obtained includes the total area of all process piping, and the total area of all process hangers.
For communication items, the actual information that needs to be obtained includes the total area of all communication and fire alarm system lines, the total number of all speakers, telephones, terminal boxes, and the total area of all fire alarm modules.
To this end, the actual information of the potential shards of the subclass to which each item class corresponds has been determined.
L4 calculates the first weight of the globally classified potential fragments, the second weight of the length-classified potential fragments, the third weight of the area-classified potential fragments in each item class, and calculates the total weight of the potential fragments in each item class by the first, second and third weights.
Specifically, the weight-first calculation can be performed by equation 1) for potential fragments classified in an overall manner in each item class,
wherein q 1 Is of weight one, N 1 For the total number of potential fragments in an item class, n 1 M is the sampling number of potential fragments sampled in whole in a certain object class i The sample weight of potential fragments in one item as a whole.
Then, the weight two is calculated for the potential fragments classified in length in each item class by the formula 2),
wherein q 2 Is of weight two, A 1 For the total area, n, of potential fragments of an item class, classified by length 2 For the sampling number, M, of potential fragments sampled by length in an item class 2-i For the sample weight, D, of potential fragments sampled by length in a certain item class i Sample diameter, L, for potential fragments sampled by length in an item class i The sample length for a potential fragment sampled in length in an item class.
Next, a weight three calculation is performed for the area-wise classified potential fragments in each item class by equation 3),
wherein q 3 Weight three, A 2 For the total area, n, of the area-wise classified potential fragments in an item class 3 For the sampling number, M, of the potential fragments sampled by area in a certain object class 3-i Sample weight for potential fragments sampled by area in a certain item class, B 3-i Sample area for potential fragments sampled by area in a certain item class.
Finally, the total weight of potential fragments in each item class is calculated by equation 4),
Q i ＝q 1 +q 2 +q 3 4)
wherein Q is i Q is the total weight of potential fragments in an item class 1 Weight one, q for potential fragments of an item class classified in an overall manner 2 Two, q, the weights of potential fragments classified by length in a certain item class 3 Three weights of potential fragments classified by area in a certain item class.
To this end, the total weight of potential fragments of each item class can be determined.
L5 calculates the total weight of potential fragments of all item classes.
The total weight of potential fragments of all item classes is calculated by equation 5),
wherein Q is the total weight of potential fragments of all the item classes, Q i Is the total weight of potential fragments in a certain item. Considering sampling and measurement errors, a 50% margin needs to be set.
To this end, the total weight of potential fragments of all item classes has been calculated.
The method for calculating the weight of the potential fragments in the containment of the nuclear power plant can be used for calculating the total weight of the potential fragments in the containment in a quantitative manner by processing and analyzing the sampling data of the potential fragments in the containment, so as to provide reference for the step-on work of fragment sources required to be developed for the follow-up newly-built unit and the filter screen reconstruction of the built power plant, facilitate the review of the filter screen design of the newly-built nuclear power plant, or provide more accurate fragment content data for the filter screen reconstruction of the built nuclear power plant, so that the input of the filter screen design is more accurate.
The above examples are only illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention. Various modifications and improvements of the technical scheme of the present invention will fall within the protection scope of the present invention without departing from the design concept of the present invention, and the technical content of the present invention is fully described in the claims.
Claims (7)
1. A method for calculating the weight of potential debris in a containment vessel of a nuclear power plant, comprising the steps of:
l1 samples potential fragments of each item at a sampling point;
l2, classifying the potential fragments sampled by each item in a mode of sampling according to the whole, sampling according to the length and sampling according to the area, calculating the weight of the potential fragments sampled according to the whole in unit number, calculating the weight of the potential fragments sampled according to the length in unit area, and calculating the weight of the potential fragments sampled according to the area in unit area;
l3 obtaining actual information of all potential fragments of each item, wherein the actual information comprises the total number of potential fragments classified in an overall manner, the total area of potential fragments classified in a length manner and the total area of potential fragments classified in an area manner;
l4 calculating a first weight of the potential fragments classified in an overall manner, a second weight of the potential fragments classified in a length manner, and a third weight of the potential fragments classified in an area manner in each item class, and calculating the total weight of the potential fragments in each item class by the first weight, the second weight, and the third weight;
l5 calculates the total weight of potential fragments of all item classes;
in the L4, the weight of the potential fragments classified in the whole manner in each item class is calculated by the formula 1),
wherein q 1 Is of weight one, N 1 For the total number of potential fragments in an item class, n 1 M is the sampling number of potential fragments sampled in whole in a certain object class i Sample weight for potential fragments in whole samples in a certain item class;
in the L4, the weight of the potential fragments classified in the length mode in each item class is calculated by the formula 2) to be two,
wherein q 2 Is of weight two, A 1 For the total area, n, of potential fragments of an item class, classified by length 2 For the sampling number, M, of potential fragments sampled by length in an item class 2-i For the sample weight, D, of potential fragments sampled by length in a certain item class i Sample diameter, L, for potential fragments sampled by length in an item class i Sample length for a potential fragment sampled in length in an item class;
in the L4, the weight three is calculated for the potential fragments classified by area mode in each item through the formula 3),
wherein q 3 Weight three, A 2 For the total area of the area-wise classified potential fragments in an item class，n 3 For the sampling number, M, of the potential fragments sampled by area in a certain object class 3-i Sample weight for potential fragments sampled by area in a certain item class, B 3-i Sample area for potential fragments sampled by area in a certain item class.
2. A method for calculating the weight of potential debris in a containment vessel of a nuclear power plant according to claim 1, wherein: in the L4, the total weight of the potential fragments in each item class is calculated by the formula 4),
Q i ＝q 1 +q 2 +q 3 4)
wherein Q is i Q is the total weight of potential fragments in an item class 1 Weight one, q for potential fragments of an item class classified in an overall manner 2 Two, q, the weights of potential fragments classified by length in a certain item class 3 Three weights of potential fragments classified by area in a certain item class.
3. A method for calculating the weight of potential debris in a containment vessel of a nuclear power plant according to claim 1, wherein: the items include valve items, process pipe and support and hanger items, mechanical module items, engineering equipment items, electrical items, communication items, instrument items, electromechanical items, building items, structural items, heating and ventilation items and water supply and drainage items.
4. A method for calculating the weight of potential debris in a containment vessel of a nuclear power plant according to claim 3, wherein: the valve items comprise various valves; the process pipeline and support and hanger items comprise various process pipelines and process support and hanger; the mechanical module object items comprise various mechanical modules; the engineering equipment item class comprises various engineering equipment; the electric items comprise a pull box, a support hanger, a first cable, a cable guide pipe, a cable bridge and a lamp; the communication items comprise a communication and fire alarm system pipeline, a loudspeaker, a telephone, a wiring terminal box and a fire alarm module; the instrument items comprise instruments, a mounting bracket, an instrument pipe, a cable piping and a first cabinet; the electromechanical items comprise a device junction box, a second cable and a second cabinet; the building items comprise various rooms and various elevators; the structural items comprise various steel platforms, grating plates and elevator shaft modules; the heating and ventilation items comprise various heating and ventilation system pipelines and support hangers; the water supply and drainage items comprise various water supply and drainage system pipelines and support and hanging frames.
5. A method for calculating the weight of potential debris in a containment vessel of a nuclear power plant according to claim 3, wherein: in said L5, the total weight of potential fragments of all species is calculated by equation 5),
wherein Q is the total weight of potential fragments of all the item classes, Q i Is the total weight of potential fragments in a certain item.
6. A method for calculating the weight of potential debris in a containment vessel of a nuclear power plant according to claim 1, wherein: the sampling points are positioned at the presumed break positions, the influence areas and the special areas in the shell after the water loss accident.
7. A method for calculating the weight of potential debris in a containment vessel of a nuclear power plant according to claim 1, wherein: the number of potential fragments sampled in whole is not less than 10 pieces per item class, and/or the number of potential fragments sampled in length is not less than 7 pieces, and/or the number of potential fragments sampled in area is not less than 5 pieces.
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| US6207031B1 (en) * | 1997-09-15 | 2001-03-27 | Whitehead Institute For Biomedical Research | Methods and apparatus for processing a sample of biomolecular analyte using a microfabricated device |
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|---|---|---|---|---|
| CN207264790U (en) * | 2017-09-06 | 2018-04-20 | 中广核工程有限公司 | Nuclear power plant's accident fragment intercepts filtration system |
| CN108960602A (en) * | 2018-06-25 | 2018-12-07 | 中广核研究院有限公司 | A kind of nuclear power plant's extension containment test period risk evaluating method |
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