CN109614635B - Nuclear power plant cable secondary bridge capacity pre-judging method - Google Patents

Abstract

The invention relates to a nuclear power plant cable secondary bridge capacity prejudging method, in the secondary bridge design process, a main bridge point position is determined, a cable path planning data set is established, the total capacity of cables of a main bridge point position section and each branch section is sequentially calculated according to the cable path planning data set, the weak point of the capacity of the secondary bridge of the whole plant is accurately positioned by the method, the total capacity of the cables at the weak point is rapidly counted, and the total capacity of the cables extends from the point to the beginning of the cables, so that the capacity information of the cables of the secondary bridge of the whole plant is comprehensively mastered. Compared with the prior art, the method has the advantages of full analysis coverage, good foresight, accurate judgment of the rationality of the secondary bridge capacity design, meeting of project secondary bridge capacity design requirements, and good reference significance for the capacity design of other engineering cable bridges.

Description

Nuclear power plant cable secondary bridge capacity pre-judging method

Technical Field

The invention belongs to the technology of cable bridge design of a nuclear power plant, and particularly relates to a capacity pre-judging method for a secondary bridge of a cable in the nuclear power plant.

Background

The cable laying is a complex and tedious work, and particularly for large-scale engineering construction projects such as nuclear power plants, the system is complex, the requirement on the safety level is high, the volume of the cable laying is huge, and the design difficulty is high. The cable bridge system is main equipment for standardizing and protecting the safety of cables and transmission lines in various infrastructure projects.

For the design of an advanced pressurized water reactor nuclear power plant, a nuclear island secondary bridge refining design is adopted and a bill of materials is opened for engineering purchase. Therefore, the accuracy requirement on the secondary bridge capacity design is higher. In the past, the traditional design fails to comprehensively and systematically analyze the secondary bridge capacity, and in order to meet the design accuracy of the secondary bridge capacity of the cable and avoid the problem of bridge overload, which brings a plurality of problems to later construction and purchase, a set of nuclear island secondary bridge capacity pre-judging method needs to be established.

Disclosure of Invention

The invention aims to comprehensively and effectively evaluate the capacity of a full island secondary bridge of a nuclear power plant and correct overload positions in time, and provides a nuclear power plant cable secondary bridge capacity prejudging method, so that the accuracy of cable bridge arrangement design and material purchase is improved.

The technical scheme of the invention is as follows: a nuclear power plant cable secondary bridge capacity pre-judging method comprises the following steps:

(1) Determining main bridge point positions and establishing a cable path planning data set, wherein the main bridge point positions are points of the secondary bridge connected with the main bridge;

(2) Determining a secondary bridge capacity prejudging object, wherein the secondary bridge capacity prejudging object comprises a local secondary bridge and a global secondary bridge, the local secondary bridge is a secondary bridge distributed at the initial position of a cable channel, and the global secondary bridge has the function of a local secondary bridge and is a secondary bridge serving as a through-channel cable channel;

(3) According to the cable path planning data set, counting the total capacity C0 of the cable at each main bridge point position;

(4) Calculating the total capacity C1 of the cable borne by the relevant secondary bridge closest to the point position section by taking the total capacity of the point position cable of each main bridge in the step (3) as a starting point;

(5) Extending the point location section in the step (4) to the local equipment end, and calculating the total cable capacity C2 of the branch section after the point location section;

(6) And calculating the total capacity of the cables of each subsequent branch section by analogy until the partial secondary bridge is cut off, and further finishing the bridge capacity prejudgment of the weak points of all secondary bridge capacities of the nuclear island.

Further, according to the method for predicting the capacity of the secondary bridge of the cable in the nuclear power plant, in the step (1), the main bridge point location is encoded, which comprises the following steps: factory building + layer number + horizontal bridge/vertical ladder + serial number.

Further, according to the cable secondary bridge capacity pre-judging method of the nuclear power plant, the cable path planning data set in the step (1) is a data base of the bridge capacity pre-judging method formed by classifying and integrating cable data and adding cable sectional area and starting point position information; the information for each cable in the dataset includes: the cable number, the safety row, the color code, the starting equipment, the position, the terminal equipment, the position, the cable characteristic code, the cable sectional area, whether the master tray is arranged, the master tray laying start point position and the master tray laying end point position.

Further, the method for predicting the capacity of the secondary bridge of the cable in the nuclear power plant comprises the following calculation method in the step (4): c1 =c0+c1 ', C1' is the non-upper master tray cable and the value of the C1' term is determined by means of the cable planning dataset and the secondary bridge arrangement by means of the total cable capacity of the partial path cabling of the point segment.

Further, the method for predicting the capacity of the secondary bridge of the cable in the nuclear power plant comprises the following calculation method in the step (5): c2 And C11 is the total capacity of the cables branched to the main bridge point after the point section, C2 'is the total capacity of the cables which are not on the main tray cable and are laid by the partial paths of the branched section, and the value of the C2' item is determined by means of a cable planning data set and the secondary bridge arrangement condition.

The beneficial effects of the invention are as follows:

(1) The nuclear power plant cable secondary bridge capacity pre-judging method provided by the invention can comprehensively pre-judge the secondary bridge capacities of a plurality of nuclear power plants, and effectively avoid the omission of the traditional design method;

(2) The method is simple and practical, has high operation efficiency and accurate judgment, and particularly has 100% of analysis accuracy for overload parts in the pre-judgment analysis;

(3) The method can avoid potential safety hazards caused by overload of the secondary bridge frame in the later period of engineering, and improves the safety of cable laying

Drawings

FIG. 1 is a diagram of secondary bridge classification and pre-judgment object examples;

FIG. 2 is a schematic diagram of a secondary bridge capacity pre-judging method;

FIG. 3 is a diagram of a simulation example of a secondary bridge capacity pre-judgment method.

In fig. 1, 1-local secondary bridge, 2-global secondary bridge; the thin solid line represents the secondary bridge and the double solid line with arrows represents the primary bridge.

In fig. 2, the dashed box part is the principle of action of the secondary bridge capacity pre-judging method.

In FIG. 3, the total cable capacity at the C0-main bridge point; (1) (6) the secondary bridge frame capacity weak section and the secondary weak section … … respectively; C1-C6 are the cable capacities in the bridge frames of the sections (1) - (6); and C11-C51 are the total capacity of the cables branched to the main bridge point positions after the sections (1) - (5).

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

The invention aims to comprehensively pre-judge the capacity of the weak section of the secondary bridge of the nuclear island, and the pre-judging process comprises three steps:

first, upstream data integration. And (3) defining the point positions and the numbers of the main bridge frames, and establishing a cable path planning data set. The secondary bridge is a channel from the electrical instrument control equipment to the main bridge, and a secondary bridge access main bridge point is defined as a main bridge point. Carding the primary and secondary bridge of the nuclear island, providing unique codes for the points of the secondary bridge connected with the primary bridge, and providing a coding rule: factory building + layer number + horizontal bridge/vertical ladder + running water number, 1 represents horizontal bridge, 2 represents vertical ladder. For example, NX61C3, represents an NX plant 6 level horizontal bridge C3 access point.

The cable data are classified and integrated, and information such as the sectional area of the cable, starting point positions and the like is added to form a data base of the bridge capacity pre-judging method, and the data base is shown in table 1 for example. The information for each cable in the dataset includes: the cable number, the safety row, the color code, the starting equipment, the position, the terminal equipment, the position, the cable characteristic code, the cable sectional area, whether the master tray is arranged, the master tray laying start point position and the master tray laying end point position.

Table 1 cable path planning dataset example

And secondly, determining a secondary bridge capacity prejudging object and an action principle. The number of secondary bridge sections of the nuclear power cable is huge, and the secondary bridge sections are divided into two types: the 1-local secondary bridge is distributed at the initial position of the cable channel, and the capacity of the bridge can be accurately judged by the traditional method; the 2-global secondary bridge has the function of a local secondary bridge and serves as a passing cable channel, and generally has two or more branches which are converged. Class 2 bridges are secondary bridge capacity prejudging objects, and the method is defined as a capacity analysis weak point.

Principle of: in a group of numerous and interrelated analysis objects, weak links for locating the analyzed parameters are continuously extended, and all the problem points are finally judged. The part 2 circled by the oval dotted line in fig. 1 is defined as a global secondary bridge, and is a capacity prejudging object and is also a weak point of capacity analysis. The principle of the method is shown in the dotted line frame part of fig. 2, for the secondary bridge capacity prejudging method, in the secondary bridge arrangement design process, the weak point of the bridge capacity (the total capacity of the cable at the point is convenient to count), the point is pushed to the on-site side, and the total capacity of the cable and the bridge filling rate of the weak point, the secondary weak point and the like are sequentially pushed out through a given algorithm. And judging the rationality of the secondary bridge capacity design.

Finally, the cable capacity of the weak point of the capacity is calculated, the filling rate of the secondary bridge of the weak point is judged, and taking fig. 3 as an example, the secondary bridge capacity pre-judging step is described in detail.

And according to the cable path planning data set, counting the total capacity C0 of the cable at a certain main bridge point position. Except for the legend, C1 'to C6' are defined as non-upper master tray cables and borrow the total cable capacity of 1-6 segments of partial path cabling. The weak point of the capacity is 1-6 sections of secondary bridges, and the total capacity of the cable is respectively:

C1＝C0+C1’；

C2＝CO-C11+C2’；

C3＝C0-C11-C21+C3’；

……

C6＝C0-C11-C21-C31-C41-C51+C6’；

according to the total capacity of each section of cable and the arrangement specification of the secondary bridge, the filling rate of each section of secondary bridge can be conveniently judged. In the above implementation method, other necessary techniques not described and related to implementation are adopted in the prior art, and the detailed description is not given in order.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims (2)

1. A nuclear power plant cable secondary bridge capacity pre-judging method comprises the following steps:

(1) Determining main bridge point positions and establishing a cable path planning data set, wherein the main bridge point positions are points of the secondary bridge connected with the main bridge; the cable path planning data set is a data base of a bridge capacity pre-judging method formed by classifying and integrating cable data and adding cable sectional area and starting point position information, and the information of each cable in the data set comprises the following components: the method comprises the steps of cable number, safety row, color code, starting equipment, position, terminal equipment, position, cable characteristic code, cable sectional area, whether a master tray is arranged, a master tray laying start point position and a master tray laying end point position;

(2) Determining a secondary bridge capacity prejudging object, wherein the secondary bridge capacity prejudging object comprises a local secondary bridge and a global secondary bridge, the local secondary bridge is a secondary bridge distributed at the initial position of a cable channel, and the global secondary bridge has the function of a local secondary bridge and is a secondary bridge serving as a through-channel cable channel;

(3) According to the cable path planning data set, counting the total capacity C0 of the cable at each main bridge point position;

(4) Taking the total capacity of the point-position cables of each main bridge frame in the step (3) as a starting point, calculating the total capacity C1 of the cables born by the related secondary bridge frames closest to the point-position section, wherein the calculation method comprises the following steps: c1 =c0+c1 ', C1' being the non-upper master tray cable and borrowing the total cable capacity of the partial path cabling of the point segment, the value of the C1' term being determined by means of the cable planning dataset and the secondary bridge arrangement;

(5) Extending the point location section to the local equipment end in the step (4), and calculating the total cable capacity C2 of the branch section after the point location section, wherein the calculation method comprises the following steps: c2 The value of the term C2' is determined by means of a cable planning data set and secondary bridge arrangement conditions;

(6) And calculating the total capacity of the cables of each subsequent branch section by analogy until the partial secondary bridge is cut off, and further finishing the bridge capacity prejudgment of the weak points of all secondary bridge capacities of the nuclear island.

2. The nuclear power plant cable secondary bridge capacity pre-judging method according to claim 1, wherein: in the step (1), encoding the main bridge point positions includes: factory building + layer number + horizontal bridge/vertical ladder + serial number.

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