CN116344086A - Reactor core feeding pipe blocking on-line treatment system and method of fuel loading and unloading system - Google Patents
Reactor core feeding pipe blocking on-line treatment system and method of fuel loading and unloading system Download PDFInfo
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- CN116344086A CN116344086A CN202310344488.9A CN202310344488A CN116344086A CN 116344086 A CN116344086 A CN 116344086A CN 202310344488 A CN202310344488 A CN 202310344488A CN 116344086 A CN116344086 A CN 116344086A
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- 239000000446 fuel Substances 0.000 title claims abstract description 107
- 230000000903 blocking effect Effects 0.000 title claims abstract description 53
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000002955 isolation Methods 0.000 claims abstract description 71
- 238000010992 reflux Methods 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims abstract description 14
- 238000010926 purge Methods 0.000 claims description 55
- 238000012545 processing Methods 0.000 claims description 19
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 34
- 230000002457 bidirectional effect Effects 0.000 description 13
- 238000012423 maintenance Methods 0.000 description 7
- 238000011176 pooling Methods 0.000 description 3
- 239000002901 radioactive waste Substances 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000003758 nuclear fuel Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/02—Details of handling arrangements
- G21C19/10—Lifting devices or pulling devices adapted for co-operation with fuel elements or with control elements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/18—Apparatus for bringing fuel elements to the reactor charge area, e.g. from a storage place
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/26—Arrangements for removing jammed or damaged fuel elements or control elements; Arrangements for moving broken parts thereof
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/32—Apparatus for removing radioactive objects or materials from the reactor discharge area, e.g. to a storage place; Apparatus for handling radioactive objects or materials within a storage place or removing them therefrom
-
- 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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- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention provides a reactor core feeding pipe blocking on-line treatment system and a reactor core feeding pipe blocking on-line treatment method of a fuel loading and unloading system, wherein the input end of a reactor is connected with the outlet end of a reactor core feeding pipe, and the output end of the reactor is connected with a reactor core unloading assembly; the output end of the reactor core unloading assembly is connected with the broken ball separation assembly; an output end of the ball breaking separation assembly is communicated with an inlet end of the fuel lifting pipe; the outlet end of the fuel lifting pipe is connected with the inlet end of the reactor core feeding pipe; the first end of the first gas reflux section is communicated with the inlet end of the reactor core feeding pipe, the second end of the first gas reflux section is communicated with the converging tank, and a first isolation valve group is arranged on the first gas reflux section; the converging tank is connected with a first pressure regulating assembly. The invention has the technical effects that the design is reasonable, the on-line release of the blocking fault of the reactor core feeding section can be realized, and the fault release efficiency is high.
Description
Technical Field
The invention belongs to the technical field of reactor engineering, and particularly relates to an on-line reactor core feed pipe blocking treatment system and method of a fuel loading and unloading system.
Background
The high temperature gas cooled reactor utilizes a fuel loading and unloading system to carry out initial loading, non-shutdown refueling and core emptying and recharging under extreme accidents of the pebble-bed reactor core, and a reactor core feeding pipe adopts two-row double-screw arrangement, and fuel balls fall into the pebble-bed reactor core after being decelerated by reactor core feeding pipe sections.
The fuel ball may be blocked in the whole flow pipeline and equipment of the fuel loading and unloading system, and the equipment which may be blocked comprises a discharging device, a broken ball separating device, a fuel consumption measuring and positioning distributor, a flow blocking device, a charging temporary storage device, a discharging temporary storage device and the like. The blocking for the equipment is designed to be an on-line breaking method for different blocking, and the method comprises the following steps: mechanical bridge breaking device, equipment initialization, equipment forward rotation, reverse rotation logic and the like. And the blocking in the reactor core unloading section pipeline is broken by the following modes: the upper limit of the ball storage number of different pipe sections, the pneumatic disturbance and the like are limited through logic.
However, as for the blocking of the reactor core feeding pipe, no targeted blocking treatment method exists at present, once the blocking fault occurs on the reactor core feeding pipe, the blocking fuel ball needs to be disassembled to take out the blocking fuel ball, and a great radioactivity risk exists, so that an online treatment method for the blocking of the reactor core feeding pipe of the high-temperature gas cooled reactor fuel loading and unloading system is needed to solve the technical problems.
Disclosure of Invention
The invention aims at solving at least one of the technical problems existing in the prior art and provides a novel technical scheme of a reactor core feed pipe blocking on-line treatment system and method of a fuel loading and unloading system.
According to a first aspect of the present invention there is provided an on-line processing system for core feed pipe blockage of a fuel handling system, comprising:
the fuel loading and unloading ball flow main unit comprises a reactor, a reactor core unloading assembly, a broken ball separation assembly, a fuel lifting pipe and a reactor core feeding pipe, wherein the input end of the reactor is connected with the outlet end of the reactor core feeding pipe, and the output end of the reactor is connected with the reactor core unloading assembly; the output end of the reactor core unloading assembly is connected with the broken ball separation assembly; an output end of the ball breaking separation assembly is communicated with an inlet end of the fuel lifting pipe; the outlet end of the fuel lifting pipe is connected with the inlet end of the reactor core feeding pipe;
the purging unit comprises a first gas reflux section, a first isolation valve group, a converging tank and a first pressure regulating component; the first end of the first gas reflux section is communicated with the inlet end of the reactor core feeding pipe, the second end of the first gas reflux section is communicated with the converging tank, and a first isolation valve group is arranged on the first gas reflux section; the converging tank is connected with a first pressure adjusting component which is used for adjusting the pressure in the converging tank;
when the reactor core feeding pipe is blocked, cleaning the reactor core feeding pipe in a purging mode; the purging mode comprises forward purging, reverse purging and alternate forward purging and reverse purging;
closing the first isolation valve group during forward purging, increasing the pressure in the converging tank, enabling the pressure difference between the converging tank and the reactor to reach a preset range, and enabling the pressure in the converging tank to be larger than the pressure in the reactor; then, opening the first isolation valve group, and purging blocking objects in the reactor core feeding pipe into the reactor under the action of pressure difference;
closing the first isolation valve group during reverse purging, reducing the pressure in the converging tank, enabling the pressure difference between the converging tank and the reactor to reach a preset range, and enabling the pressure in the converging tank to be smaller than the pressure in the reactor; then, the first isolation valve group is opened, and the blocking object in the reactor core feeding pipe is sucked into the fuel lifting pipe under the action of pressure difference.
Optionally, the fuel handling ball flow main unit further comprises a transmitter; one output end of the broken ball separation assembly is connected with the emitter, and the output end of the emitter is communicated with the inlet end of the fuel lifting pipe; the emitter is positioned at the bottom of the fuel loading and unloading ball flow main unit;
the blockage sucked into the fuel riser falls under gravity into the output end of the emitter.
Optionally, the purge unit further comprises a second gas recirculation section, a second isolation valve set, a buffer tank and a second pressure regulating assembly;
the first end of the second gas reflux section is connected with the buffer tank, and the second end of the second gas reflux section is connected with the output end of the emitter; a second isolation valve group is arranged on the second gas reflux section; the buffer tank is connected with a second pressure adjusting component which is used for adjusting the pressure in the buffer tank;
and closing the second isolation valve group, adjusting the pressure in the buffer tank, and opening the second isolation valve group during reverse purging, so that the falling speed of the blocking object in the fuel lifting pipe is reduced under the action of the pressure in the buffer tank.
Optionally, the reactor core feed pipe blocking on-line treatment system of the fuel loading and unloading system further comprises a compressor and a third isolation valve group;
the converging tank is communicated with the buffer tank through a first connecting pipe, the first connecting pipe is provided with the compressor and the third isolation valve group, and the third isolation valve group is located on one side, far away from the converging tank, of the compressor.
Optionally, the first pressure regulating assembly includes a second connecting tube and a fourth isolation valve set; the fourth isolation valve group is arranged on the second connecting pipe and used for controlling the opening or closing of the second connecting pipe.
Optionally, the second pressure regulating assembly includes a third connecting tube and a fifth isolation valve set; the fifth isolation valve group is arranged on the third connecting pipe and used for controlling the opening or closing of the third connecting pipe.
Optionally, the reactor core feeding pipe blocking on-line treatment system of the fuel loading and unloading system further comprises a spherical gas separator, wherein the outlet end of the fuel lifting pipe and the inlet end of the reactor core feeding pipe are respectively communicated with the spherical gas separator, and the first end of the first gas reflux section is communicated with the spherical gas separator.
Optionally, the preset range is 0.5MPa-1MPa.
Optionally, the reactor core feeding pipe blocking on-line processing system of the fuel loading and unloading system further comprises a first bidirectional counter and a second bidirectional counter, wherein the first bidirectional counter and the second bidirectional counter are both arranged on the fuel lifting pipe, and the second bidirectional counter is located on one side, far away from the ball breaking separation assembly, of the first bidirectional counter.
According to a second aspect of the present invention, there is provided a method of on-line processing of a core feed pipe plug of a fuel handling system, applied to the on-line processing of a core feed pipe plug of a fuel handling system as described in the first aspect, comprising the steps of:
step S100, reversely purging the reactor core feeding pipe; firstly, closing the first isolation valve group, reducing the pressure in the converging tank, enabling the pressure difference between the converging tank and the reactor to reach a preset range, and enabling the pressure in the converging tank to be smaller than the pressure in the reactor; then, opening the first isolation valve group, and sucking blocking objects in the reactor core feeding pipe into the fuel lifting pipe under the action of pressure difference;
step 200, forward purging the reactor core feed pipe: firstly, closing the first isolation valve group, increasing the pressure in the converging tank, enabling the pressure difference between the converging tank and the reactor to reach a preset range, and enabling the pressure in the converging tank to be larger than the pressure in the reactor; then, opening the first isolation valve group, and purging blocking objects in the reactor core feeding pipe into the reactor under the action of pressure difference;
step S300, alternately executing step S100 and step S200 until the blockage leaves the reactor core feed pipe.
The invention has the technical effects that:
in the embodiment of the application, the reactor core feeding pipe is matched with the reactor core feeding pipe in a forward direction and a reverse direction, so that the blocking fault of the reactor core feeding section can be relieved on line, and the fault relieving efficiency is high; in addition, maintenance personnel are not required to carry out field maintenance in the fault relieving process, the irradiation risk of personnel is greatly reduced, and the safety is high.
In addition, radioactive waste is not generated in the fault release process, wearing parts are not consumed, and the fault release cost is greatly reduced.
Drawings
FIG. 1 is a schematic diagram of an on-line processing system for blocking a core feed pipe of a fuel handling system according to an embodiment of the present invention.
In the figure: 101. a reactor; 102. a core discharge assembly; 103. a ball separator; 104. a ball breaking separation assembly; 105. a transmitter; 106. a fuel riser; 107. a first up-down counter; 108. a second bidirectional counter; 109. a core feed tube; 201. a first gas return section; 202. a first isolation valve group; 203. a converging tank; 2041. a second connection pipe; 2042. a fourth isolation valve group; 301. a second gas recirculation section; 302. the second isolating valve group; 303. a buffer tank; 304. a second pressure regulating assembly; 3041. a third connection pipe; 3042. a fifth isolation valve set; 401. a compressor; 402. the third isolating valve group; 403. a first connecting tube.
Detailed Description
Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise.
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functionality throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
The features of the terms "first", "second", and the like in the description and in the claims of this application may be used for descriptive or implicit inclusion of one or more such features. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
In the description of the present application, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," etc. indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be configured and operated in a particular orientation, and therefore should not be construed as limiting the present application.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
As shown in fig. 1, according to a first aspect of the present invention, there is provided an on-line reactor core feed pipe blockage treatment system for a fuel loading and unloading system, which effectively solves the blockage failure of a reactor core feed pipe occurring in a high temperature gas cooled reactor, and does not cause the damage of a ball flow in the process of cleaning a pipe.
Specifically, the reactor core feed pipe blocking on-line treatment system of the fuel loading and unloading system comprises:
the fuel loading and unloading ball flow main unit comprises a reactor 101, a reactor core unloading assembly 102, a broken ball separation assembly 104, a fuel lifting pipe 106 and a reactor core feeding pipe 109, wherein the input end of the reactor 101 is connected with the outlet end of the reactor core feeding pipe 109, and the output end is connected with the reactor core unloading assembly 102; the output end of the reactor core unloading assembly 102 is connected with the broken ball separation assembly 104; an output end of the ball breaker assembly 104 communicates with an inlet end of the fuel riser 106; the outlet end of the fuel riser 106 is connected to the inlet end of the core feed pipe 109; wherein, the reactor 101, the reactor core unloading assembly 102, the ball breaking separation assembly 104, the fuel lifting pipe 106 and the reactor core feeding pipe 109 together form a closed loop, so as to realize the circulation of the fuel elements in the closed loop.
A purge unit comprising a first gas return section 201, a first isolation valve set 202, a converging tank 203, and a first pressure regulating assembly; the first gas reflux section 201 is communicated with the inlet end of the reactor core feeding pipe 109, the second end of the first gas reflux section is communicated with the converging tank 203, and a first isolation valve group 202 is arranged on the first gas reflux section 201; the converging tank 203 is connected with a first pressure adjusting component, and the first pressure adjusting component is used for adjusting the pressure in the converging tank 203;
when the reactor core feeding pipe 109 is blocked, cleaning the reactor core feeding pipe 109 in a purging mode; the purging mode comprises forward purging, reverse purging and forward purging and reverse purging which are alternately performed.
During forward purging, the first isolation valve set 202 is closed, the pressure in the converging tank 203 is increased, the pressure difference between the converging tank 203 and the reactor 101 reaches a preset range, and the pressure in the converging tank 203 is larger than the pressure in the reactor 101; then, the first isolation valve set 202 is opened, and the blockage in the core feed pipe 109 is purged into the reactor 101 under the pressure differential.
During reverse purging, the first isolation valve set 202 is closed, the pressure in the converging tank 203 is reduced, the pressure difference between the converging tank 203 and the reactor 101 reaches a preset range, and the pressure in the converging tank 203 is smaller than the pressure in the reactor 101; then, the first isolation valve set 202 is opened, and the blockage in the core feed pipe 109 is pumped into the fuel riser 106 by the pressure differential.
During normal operation of the reactor 101, fuel elements discharged from the reactor 101 sequentially pass through the core discharge assembly 102 and the ball breaking separation assembly 104, fuel elements which do not reach the burnup depth return to the core through the fuel lifting section and the core feed pipe 109, and new fuel elements are lifted to the core feed pipe 109 from a new fuel interface through the generator and finally are loaded into the reactor 101. When the reactor core feeding pipe 109 is blocked, the blocked reactor core feeding pipe 109 is cleaned by adopting an on-line processing method of the reactor core feeding pipe blocking of the fuel loading and unloading system, so that the operation is simple and the safety is higher.
In the embodiment of the application, through the mutual cooperation of the forward purging and the reverse purging of the reactor core feeding pipe 109, the online release of the blocking fault of the reactor core feeding pipe 109 can be realized, and the fault release efficiency is high; in addition, maintenance personnel are not required to carry out field maintenance in the fault relieving process, the irradiation risk of personnel is greatly reduced, and the safety is high.
In addition, radioactive waste is not generated in the fault release process, wearing parts are not consumed, and the fault release cost is greatly reduced.
Optionally, the fuel handling ball flow main unit further comprises a transmitter 105; an output end of the ball breaking separation assembly 104 is connected with the emitter 105, and an output end of the emitter 105 is communicated with an inlet end of the fuel lifting pipe 106; the emitter 105 is located at the bottom of the fuel loading ball flow main unit;
the blockage sucked into the fuel riser 106 falls under gravity into the output end of the emitter 105.
In the above embodiment, the emitter 105 provides power for the lifting process of the fuel ball in the fuel lifting pipe 106, and provides assistance for the fuel ball to circulate into the reactor 101 to participate in the reaction process, so as to ensure safe, stable and effective operation of the reactor 101.
Optionally, the purge unit further comprises a second gas recirculation section 301, a second isolation valve set 302, a buffer tank 303, and a second pressure regulating assembly 304;
the first end of the second gas reflux section 301 is connected with the buffer tank 303, and the second end is connected with the output end of the emitter 105; a second isolation valve set 302 is arranged on the second gas reflux section 301; the buffer tank 303 is connected with a second pressure adjusting assembly 304, and the second pressure adjusting assembly 304 is used for adjusting the pressure in the buffer tank 303;
and closing the second isolation valve group 302, adjusting the pressure in the buffer tank 303, and opening the second isolation valve group 302 during reverse purging, so that the falling speed of the blocking object in the fuel lifting pipe 106 is reduced under the action of the internal pressure of the buffer tank 303.
In the above embodiment, on the one hand, the buffer tank 303 may be in communication with the convergence tank 203 to increase the volume space of the convergence tank 203, so as to facilitate pressure adjustment in the convergence tank 203, which is advantageous for implementing the forward purging process and the reverse purging process.
On the other hand, the pressure in the buffer tank 303 can be regulated to provide resistance for the descending process of the fuel ball in the reverse purging process, so that the safety of the descending process of the fuel ball is ensured, and the circulation of the fuel ball is facilitated.
Optionally, the reactor core feed pipe blocking on-line processing system of the fuel loading and unloading system further comprises a compressor 401 and a third isolation valve group 402;
the converging tank 203 is communicated with the buffer tank 303 through a first connecting pipe 403, the first connecting pipe 403 is provided with a compressor 401 and a third isolation valve set 402, and the third isolation valve set 402 is located at one side of the compressor 401 away from the converging tank 203.
In the above embodiment, the compressor 401 can circulate the gas among the reactor 101, the converging tank 203 and the buffer tank 303, and when the fuel ball is lifted in the fuel lifting pipe 106, the power can be provided for the lifting process of the fuel ball, so that the fuel ball is stably lifted and smoothly enters the reactor core of the reactor 101.
Optionally, the first pressure regulating assembly includes a second connecting tube 2041 and a fourth isolation valve set 2042; the fourth isolation valve group 2042 is disposed on the second connection pipe 2041, and is used for controlling the second connection pipe 2041 to be opened or closed. The fourth isolation valve group 2042 can effectively control the adjustment of the pressure in the convergence tank 203, and the operation is very convenient.
Optionally, the second pressure regulating assembly 304 includes a third connecting tube 3041 and a fifth isolation valve set 3042; the fifth isolation valve set 3042 is disposed on the third connection pipe 3041, and is used for controlling the opening or closing of the third connection pipe 3041. The fifth isolation valve set 3042 can effectively control the adjustment of the pressure in the buffer tank 303, and the operation is very convenient.
Optionally, the reactor core feeding pipe blocking on-line treatment system of the fuel loading and unloading system further comprises a spherical gas separator 103, the outlet end of the fuel lifting pipe 106 and the inlet end of the reactor core feeding pipe 109 are respectively communicated with the spherical gas separator 103, and the first end of the first gas reflux section 201 is communicated with the spherical gas separator 103.
In the above embodiment, the ball gas separator 103 can effectively realize ball gas separation of the reactor 101 in the normal operation process, so as to ensure the safety and stability of the operation of the reactor 101 when the fuel balls enter the core of the reactor 101.
Optionally, the preset range is 0.5MPa-1MPa. This allows the pressure differential between the converging tank 203 and the core of the reactor 101 to be within a reasonable range, which can effectively achieve both forward and reverse purge processes, thereby rapidly cleaning the blockage in the core feed pipe 109 while ensuring the safety of the online treatment process.
Optionally, the reactor core feeding pipe blocking on-line processing system of the fuel loading and unloading system further comprises a first bidirectional counter 107 and a second bidirectional counter 108, wherein the first bidirectional counter 107 and the second bidirectional counter 108 are both arranged on the fuel lifting pipe 106, and the second bidirectional counter 108 is located on one side of the first bidirectional counter 107 away from the ball breaking separation assembly 104.
In the above embodiment, it is possible to accurately and timely determine whether the fuel ball passes through the fuel riser 106 during the reverse purge process by using the first and second bi-directional counters 107 and 108, thereby accurately determining whether to end the process of the core feed pipe blocking on-line treatment of the fuel loading and unloading system.
In a specific embodiment, the pooling tank 203 is communicated with the buffer tank 303 during the reverse purge to increase the volume of the pooling tank 203, thereby increasing the pressure regulation range within the pooling tank 203. By reducing the pressure in the convergence tank 203 such that the pressure in the convergence tank 203 and the core side pressure of the reactor 101 form a pressure difference, the pressure difference can be increased continuously; then, by opening the first isolation valve set 202 between the converging tank 203 and the reactor 101 to communicate the two spaces with different pressures, the pipeline at the blocking position can have instantaneous large-flow helium gas flowing through, so that reverse suction is caused to the ball flow at the blocking position, and blocking objects (spherical elements or broken balls) can be reversely sucked out of the reactor core feeding pipe 109; then, the blocking object finally falls into the output end of the emitter 105 through the fuel riser 106 under the action of gravity.
During forward purging, the fuel loading and unloading system is communicated with the reactor core of the reactor 101, the converging tank 203 is communicated with the buffer tank 303, the pressure of the converging tank 203 is increased to form a pressure difference value with the reactor core side pressure of the reactor 101 (the pressure difference can be continuously increased), the first isolation valve bank 202 between the converging tank 203 and the reactor 101 is opened to enable two spaces with different pressures to be communicated, and the pipeline at the blocking position can flow instant large-flow helium gas, so that the ball flow at the blocking position is positively purged, blocking objects (ball elements or broken balls) can be positively purged out of the reactor core feeding pipe 109, and finally fall into the reactor core of the reactor 101.
The steps of forward purging and reverse purging are alternately performed until no fuel balls are blown back out of the core feed pipe 109, and auxiliary verification can be performed by the first and second bi-directional counters 107 and 108 on the fuel riser 106.
According to a second aspect of the present invention, there is provided a method of on-line processing of a core feed pipe plug of a fuel handling system, applied to the on-line processing of a core feed pipe plug of a fuel handling system as described in the first aspect, comprising the steps of:
step S100, reversely purging the reactor core feed pipe 109; first, closing the first isolation valve set 202, reducing the pressure in the convergence tank 203 and enabling the pressure difference between the convergence tank 203 and the reactor 101 to reach a preset range, wherein the pressure in the convergence tank 203 is smaller than the pressure in the reactor 101; then, opening the first isolation valve set 202, and sucking the blocking object in the core feed pipe 109 into the fuel riser 106 under the action of the pressure difference;
step S200, forward purging the core feed pipe 109: first, closing the first isolation valve set 202, increasing the pressure in the convergence tank 203 and enabling the pressure difference between the convergence tank 203 and the reactor 101 to reach a preset range, wherein the pressure in the convergence tank 203 is greater than the pressure in the reactor 101; then, opening the first isolation valve group 202, and purging the blocking object in the reactor core feeding pipe 109 into the reactor 101 under the action of pressure difference;
step S300, alternately executing step S100 and step S200 until the blockage leaves the core feed pipe 109.
In the embodiment, the on-line treatment method for the blocking of the reactor core feed pipe of the fuel loading and unloading system is reasonable in design, can realize on-line release of blocking faults of the reactor core feed section, and is high in fault release efficiency; in addition, maintenance personnel are not required to carry out field maintenance in the fault relieving process, the irradiation risk of personnel is greatly reduced, and the safety is high. And radioactive waste is not generated in the fault release process, the wearing parts are not consumed, and the fault release cost is greatly reduced.
In the embodiment of the application, the reactor core feed pipe blocking on-line processing system and method of the fuel loading and unloading system can overcome the defect that in the prior art, after the reactor core feed pipe 109 is blocked, the reactor core feed pipe 109 needs to be disassembled and overhauled in a high-radioactivity environment, can efficiently solve the problem that the reactor core feed pipe 109 of the high-temperature gas cooled reactor fuel loading and unloading system is blocked, does not need maintenance personnel to carry out on-site overhauling in the fault relieving process, greatly reduces the irradiation risk of personnel, and has higher safety.
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. An on-line processing system for blocking a core feed pipe of a fuel loading and unloading system, comprising:
the fuel loading and unloading ball flow main unit comprises a reactor, a reactor core unloading assembly, a broken ball separation assembly, a fuel lifting pipe and a reactor core feeding pipe, wherein the input end of the reactor is connected with the outlet end of the reactor core feeding pipe, and the output end of the reactor is connected with the reactor core unloading assembly; the output end of the reactor core unloading assembly is connected with the broken ball separation assembly; an output end of the ball breaking separation assembly is communicated with an inlet end of the fuel lifting pipe; the outlet end of the fuel lifting pipe is connected with the inlet end of the reactor core feeding pipe;
the purging unit comprises a first gas reflux section, a first isolation valve group, a converging tank and a first pressure regulating component; the first end of the first gas reflux section is communicated with the inlet end of the reactor core feeding pipe, the second end of the first gas reflux section is communicated with the converging tank, and a first isolation valve group is arranged on the first gas reflux section; the converging tank is connected with a first pressure adjusting component which is used for adjusting the pressure in the converging tank;
when the reactor core feeding pipe is blocked, cleaning the reactor core feeding pipe in a purging mode; the purging mode comprises forward purging, reverse purging and alternate forward purging and reverse purging;
closing the first isolation valve group during forward purging, increasing the pressure in the converging tank, enabling the pressure difference between the converging tank and the reactor to reach a preset range, and enabling the pressure in the converging tank to be larger than the pressure in the reactor; then, opening the first isolation valve group, and purging blocking objects in the reactor core feeding pipe into the reactor under the action of pressure difference;
closing the first isolation valve group during reverse purging, reducing the pressure in the converging tank, enabling the pressure difference between the converging tank and the reactor to reach a preset range, and enabling the pressure in the converging tank to be smaller than the pressure in the reactor; then, the first isolation valve group is opened, and the blocking object in the reactor core feeding pipe is sucked into the fuel lifting pipe under the action of pressure difference.
2. The fuel loading and unloading system core feed pipe blockage on-line processing system of claim 1, wherein the fuel loading and unloading ball flow main unit further comprises a transmitter; one output end of the broken ball separation assembly is connected with the emitter, and the output end of the emitter is communicated with the inlet end of the fuel lifting pipe; the emitter is positioned at the bottom of the fuel loading and unloading ball flow main unit;
the blockage sucked into the fuel riser falls under gravity into the output end of the emitter.
3. The fuel loading and unloading system core feed pipe blockage on-line processing system of claim 2, wherein the purge unit further comprises a second gas return section, a second isolation valve set, a buffer tank, and a second pressure regulation assembly;
the first end of the second gas reflux section is connected with the buffer tank, and the second end of the second gas reflux section is connected with the output end of the emitter; a second isolation valve group is arranged on the second gas reflux section; the buffer tank is connected with a second pressure adjusting component which is used for adjusting the pressure in the buffer tank;
and closing the second isolation valve group, adjusting the pressure in the buffer tank, and opening the second isolation valve group during reverse purging, so that the falling speed of the blocking object in the fuel lifting pipe is reduced under the action of the pressure in the buffer tank.
4. The fuel loading and unloading system core feed pipe blockage on-line processing system of claim 3, further comprising a compressor and a third isolation valve set;
the converging tank is communicated with the buffer tank through a first connecting pipe, the first connecting pipe is provided with the compressor and the third isolation valve group, and the third isolation valve group is located on one side, far away from the converging tank, of the compressor.
5. The fuel loading and unloading system core feed pipe blockage on-line processing system of claim 4, wherein the first pressure regulating assembly comprises a second connecting pipe and a fourth isolation valve set; the fourth isolation valve group is arranged on the second connecting pipe and used for controlling the opening or closing of the second connecting pipe.
6. The fuel loading and unloading system core feed pipe blockage on-line processing system of claim 4, wherein the second pressure regulating assembly comprises a third connecting pipe and a fifth isolation valve set; the fifth isolation valve group is arranged on the third connecting pipe and used for controlling the opening or closing of the third connecting pipe.
7. The fuel loading and unloading system core feed pipe blockage on-line processing system of claim 1, further comprising a spherical gas separator, wherein the outlet end of the fuel riser and the inlet end of the core feed pipe are respectively in communication with the spherical gas separator, and wherein the first end of the first gas return section is in communication with the spherical gas separator.
8. The fuel loading and unloading system core feed pipe blockage on-line processing system of claim 1, wherein the preset range is 0.5MPa-1MPa.
9. The fuel loading and unloading system core feed pipe blockage on-line processing system of claim 1, further comprising a first bi-directional counter and a second bi-directional counter, the first bi-directional counter and the second bi-directional counter each disposed on the fuel riser and the second bi-directional counter being located on a side of the first bi-directional counter remote from the ball breaking separation assembly.
10. A method for on-line treatment of a core feed pipe plug of a fuel handling system, characterized by being applied to the core feed pipe plug on-line treatment system of a fuel handling system as claimed in any one of claims 1 to 9, comprising the steps of:
step S100, reversely purging the reactor core feeding pipe; firstly, closing the first isolation valve group, reducing the pressure in the converging tank, enabling the pressure difference between the converging tank and the reactor to reach a preset range, and enabling the pressure in the converging tank to be smaller than the pressure in the reactor; then, opening the first isolation valve group, and sucking blocking objects in the reactor core feeding pipe into the fuel lifting pipe under the action of pressure difference;
step 200, forward purging the reactor core feed pipe: firstly, closing the first isolation valve group, increasing the pressure in the converging tank, enabling the pressure difference between the converging tank and the reactor to reach a preset range, and enabling the pressure in the converging tank to be larger than the pressure in the reactor; then, opening the first isolation valve group, and purging blocking objects in the reactor core feeding pipe into the reactor under the action of pressure difference;
step S300, alternately executing step S100 and step S200 until the blockage leaves the reactor core feed pipe.
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