CN115171929A - Method for processing small gap between water supply branch pipe and fuel channel of heavy water reactor set - Google Patents
Method for processing small gap between water supply branch pipe and fuel channel of heavy water reactor set Download PDFInfo
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- CN115171929A CN115171929A CN202110356846.9A CN202110356846A CN115171929A CN 115171929 A CN115171929 A CN 115171929A CN 202110356846 A CN202110356846 A CN 202110356846A CN 115171929 A CN115171929 A CN 115171929A
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- branch pipe
- main heat
- gap
- intervention
- heat transfer
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- 239000000446 fuel Substances 0.000 title claims abstract description 75
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 238000012545 processing Methods 0.000 title claims abstract description 9
- 238000012546 transfer Methods 0.000 claims abstract description 60
- 230000005540 biological transmission Effects 0.000 claims abstract description 34
- 238000005299 abrasion Methods 0.000 claims abstract description 13
- 238000011156 evaluation Methods 0.000 claims abstract description 8
- 238000012854 evaluation process Methods 0.000 claims abstract description 4
- 238000001035 drying Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract 1
- 238000009434 installation Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/017—Inspection or maintenance of pipe-lines or tubes in nuclear installations
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/14—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from headers; from joints in ducts
-
- 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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a method for processing a small gap between a water supply branch pipe and a fuel channel of a heavy water reactor unit, which comprises the following steps of 1: checking the gap using an endoscope and a long handle caliper; step 2: when the clearance is less than 3.18mm, starting an evaluation process; and step 3: intervention is performed if the gap is further reduced by step 2 evaluation. The beneficial effects are that: the main heat transmission branch pipe is physically separated from the fuel channel end part or the positioning assembly yoke clamp by installing the anti-abrasion pad, so that the main heat transmission branch pipe cannot be damaged even if friction or collision occurs in subsequent operation, the condition of the anti-abrasion pad is regularly checked, and the possibility of breakage caused by abrasion of the main heat transmission branch pipe on the end face can be eliminated; by removing the positioning assembly yoke clips, the possibility of the main heat transfer branch pipe contacting the positioning assembly yoke clips is thoroughly eliminated; by periodically checking the gaps, the possibility of the primary heat transfer legs wearing at the end faces and cracking is eliminated.
Description
Technical Field
The invention belongs to the field of fuel channels of heavy water reactor nuclear power stations, and particularly relates to a method for processing a small gap between a water supply branch pipe and a fuel channel of a heavy water reactor unit.
Background
The core of the existing heavy water reactor unit consists of 380 horizontally arranged fuel channels, and two ends of each fuel channel are respectively connected with a main heat transmission header through main heat transmission branch pipes (as shown in fig. 1). The arrangement is characterized in that the fuel channels which are transversely arranged are criss-cross with the main heat transmission branch pipes which are densely distributed on the end surface. The fuel passageway itself may elongate axially due to irradiation and the fuel passageway end members may be inclined radially under the force of the associated primary heat transfer manifold; meanwhile, the main heat transfer branch pipes are influenced by self gravity to settle. Together, it is inevitable that some of the primary heat transfer legs will have reduced clearance or even contact with the end members of their adjacent fuel passages or the locating assembly yoke clips. Since the main heat transfer branch pipe is an important pressure boundary of the main heat transfer system of the primary circuit, if the main heat transfer branch pipe is worn out by the end part or the positioning component, heavy water of the main system is leaked, and a LOCA event occurs.
Disclosure of Invention
The invention aims to provide a method for processing the problem of small gap between a water supply branch pipe and a fuel channel of a heavy water reactor set, which can effectively avoid the LOCA event caused by the abrasion of a main heat transmission branch pipe.
The technical scheme of the invention is as follows: the method for processing the problem of small gap between the water supply branch pipe and the fuel channel of the heavy water reactor set comprises the following steps:
step 1: checking the gap using an endoscope and a long handle caliper;
and 2, step: when the clearance is less than 3.18mm, starting an evaluation process;
and step 3: intervention is performed if the gap is further reduced by step 2 evaluation.
The caliper gauge used in the step 1 has two specifications of 5mm and 3.18 mm.
In step 1, the observation was continued when the gap was >5mm and normal, when the gap was >5mm and 3.18mm, and the evaluation was performed when the gap was <3.18 mm.
The step 2 includes the following cases,
when a small gap occurs below the main heat transfer manifold along the upper portion of the fuel passage end piece or the upper portion of the fuel passage locating assembly, the intervention is as in step 3, intervention mode 3; if the cantilever crane exists, checking whether a gap exists between the pipe clamp of the cantilever crane and the lower end of the main heat transmission branch pipe, and if the gap exists, performing an intervention measure in an intervention mode 1 in the step 3;
when a small gap occurs between the outside of the main heat transfer manifold and the inside of the fuel passage positioning assembly yoke clip, no intervention is required;
when a small gap is present between the inside of the main heat transfer manifold and the outside of the fuel passage positioning assembly yoke clip, the intervention is as in step 3 intervention mode 2;
when a small gap occurs between the position of the 3-6 point or the position of the 6-9 point of the main heat transfer branch pipe and the inner side or the outer side of the yoke clip of the fuel passage positioning assembly, the condition is combined with the above 3 conditions to determine whether to intervene and the intervention mode used;
in the 4 cases described above, if the main heat transfer manifold has been brought into contact with the fuel gallery end assembly or locating assembly yoke clamps, intervention mode 2 or intervention mode 3 in step 3 is performed directly, with the intervention mode being determined in particular according to the actual position of the contact.
The step 3 of the drying method comprises the following steps:
intervention mode 1: the pull rod bolt of the main heat transmission branch pipe cantilever hanger is screwed, so that the gap between the pipe clamp and the lower edge of the main heat transmission branch pipe is eliminated, and the main heat transmission branch pipe is limited from further sinking.
The step 3 of the drying method comprises the following steps:
and (3) intervention mode 2: the locating assembly yoke clip at the free end of the fuel passageway is removed.
The step 3 of the drying method comprises the following steps:
intervention mode 3: the main heat transfer branch pipe is provided with the wear-resistant pad in a physical isolation mode, and the main heat transfer branch pipe is separated from the fuel passage end part or the fuel passage positioning assembly yoke clamp at a small gap or a place where contact occurs, so that collision and abrasion are avoided.
The invention has the beneficial effects that: the main heat transmission branch pipe is physically separated from the fuel channel end part or the positioning assembly yoke clamp by installing the anti-abrasion pad, so that the main heat transmission branch pipe cannot be damaged even if friction or collision occurs in subsequent operation, the condition of the anti-abrasion pad is periodically checked, and the possibility of breakage caused by abrasion of the main heat transmission branch pipe on the end face can be eliminated; by removing the positioning assembly yoke clips, the possibility of the main heat transfer branch pipe contacting the positioning assembly yoke clips is thoroughly eliminated; the evaluation gap is not further reduced according to the bracket condition of each main heat transfer branch pipe, and the possibility of breakage caused by abrasion of the main heat transfer branch pipes at the end faces can be eliminated by regularly checking the gap. By applying the small gap treatment patent, the integrity of the pressure boundary of the primary circuit of the heavy water reactor is ensured.
Drawings
FIG. 1 is a schematic end view arrangement;
FIG. 2 is a schematic view of the primary heat transfer legs clearance with the fuel passage end pieces;
FIG. 3 is a flow chart of a method for processing a small gap between a water supply branch pipe and a fuel channel of a heavy water reactor set according to the present invention;
fig. 4 is a schematic view of the installation of the wear pad.
In the figure, 1 fuel gallery end piece, 2 main heat transfer manifold, 3 cantilever hanger, 4 wear pad.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
The invention provides a method for solving the problem of small clearance between a main heat transmission branch pipe of the existing heavy water reactor unit and an adjacent fuel channel end part or a positioning assembly yoke clamp.
In a reactor end face inspection, if the gap between the main heat transfer manifold and the fuel channel end piece or positioning assembly yoke clip is found to be less than the design requirement (the end face upper channel minimum gap requirement is greater than or equal to 3.8mm, the lower channel minimum gap requirement is greater than or equal to 5mm, as shown in fig. 2), then the small gap process flow is initiated.
As shown in FIG. 3, the method for processing the small gap problem between the feed water branch pipe and the fuel channel of the heavy water reactor set comprises the following steps:
step 1: the clearance is checked by matching an endoscope and a long-handle caliper gauge, the caliper gauge is 5mm and 3.18mm, when the clearance is larger than 5mm, the clearance is normal, when the clearance is larger than 5mm, the observation is continued and when the clearance is larger than 3.18mm, the evaluation is carried out when the clearance is smaller than 3.18 mm;
step 2: when the gap is smaller than 3.18mm, starting an evaluation process immediately, and aiming at the difference of the positions where the small gaps appear, the evaluation content is different, specifically as follows:
a small gap occurs below the main heat transfer manifold in (6 o' clock direction) with the upper portion of the fuel passage end piece or the upper portion of the fuel passage locating assembly: this situation is only possible if the main heat transfer legs continue to sink, so it is only necessary to confirm whether the main heat transfer legs continue to sink. The method is to check whether the horizontal position of the lower half section of the main heat transmission branch pipe has a cantilever hanger, if not, the main heat transmission branch pipe can be further sunk along with the operation of the unit, namely, the gap can be further reduced, so that intervention is needed, and the intervention measure is as step 3, namely, an intervention mode 3;
if the main heat transmission branch pipe is in the clearance, the main heat transmission branch pipe can be ensured to be not sunk further, if the main heat transmission branch pipe is in the clearance, the bracket can be adjusted to eliminate the clearance, so that the main heat transmission branch pipe is not sunk to the space, and the intervention measure is the step 3, namely the intervention mode 1;
a small gap occurs outside the main heat transfer manifold (3 o' clock direction) and inside the fuel passage locating assembly yoke clip: such small clearances occur in the horizontal direction, so that sinking of the main heat transfer legs does not lead to further clearance reduction, but only axial displacement (horizontal) of the fuel passages due to radiation creep is taken into account. Because the fuel channel can be axially elongated after being irradiated, namely the free end of the fuel channel can be outwardly displaced, the gap at the position can be increased along with the elongation of the channel; the fixed end can not generate axial displacement because of axial fixation, and the gap can not change. In this case, the gap is not further reduced, so no intervention is required;
a small gap occurs between the inside of the main heat transfer manifold (9 o' clock direction) and the outside of the fuel passage locating assembly yoke clip: this is similar to case 2, but because it occurs outside the fuel passage locating assembly yoke clamps, axial elongation of the fuel passage free end results in further clearance reduction or even contact, requiring immediate intervention, as in step 3, intervention mode 2, while the fuel passage fixed end also requires no intervention because it is not axially displaced.
Small gaps occur at the 3-6 or 6-9 point locations of the main heat transfer manifold and either inside or outside the fuel passage locating assembly yoke snaps: this case requires a combination of cases 1, 2, 3 to consider whether to intervene and which intervention mode is specifically used.
In the 4 cases described above, if the main heat transfer manifold has been brought into contact with the fuel gallery end assembly or locating assembly yoke clamps, intervention mode 2 or intervention mode 3 in step 3 is performed directly, with the intervention mode being determined in particular according to the actual position of the contact.
And step 3: if the clearance is further reduced by step 2, intervention is required, the main intervention modes include:
intervention mode 1: the gap between the pipe clamp and the lower edge of the main heat transmission branch pipe is eliminated by screwing a pull rod bolt of a cantilever hanger of the main heat transmission branch pipe, so that the main heat transmission branch pipe is limited from further sinking;
and (3) intervention mode 2: removing the positioning assembly yoke clamps at the free ends of the fuel channels;
intervention mode 3: the main heat transmission branch pipe is provided with the anti-abrasion pad in a physical isolation mode, and the main heat transmission branch pipe is separated from the fuel passage end part or the fuel passage positioning assembly yoke clamp at a small gap or a place where the main heat transmission branch pipe is contacted, so that collision and abrasion are avoided;
and (4) intervention mode: the stiff end of this fuel passageway of unblock, this passageway both ends all do not receive the horizontal direction restriction this moment, through using specialized tool, regard two adjacent fuel passageways as the fulcrum, promote this passageway in order to increase the clearance to being greater than 3.15mm along the axial. The method can relieve the problem of too small gap or contact, but in practical operation, the former three intervention modes can basically eliminate the problem of small gap, and the method is difficult to operate, so the method is generally avoided as much as possible.
As shown in fig. 1, the end-face equipment layout is simplified. The main heat transfer legs are arranged primarily horizontally and vertically at the face portion. The location where the small clearance problem occurs is primarily related to the primary heat transfer leg placement and the channel stretch. If the problem of small gaps between the main heat transfer branch pipes and the fuel passage end parts is solved, the small gaps are basically formed between the horizontal sections of the main heat transfer branch pipes and the fuel passage end parts below the main heat transfer branch pipes, and the main reason is that the main heat transfer branch pipes settle; the small clearance between the main heat transfer manifold and the positioning assembly yoke clips, which can occur between the main heat transfer manifold vertical or horizontal sections and its adjacent positioning assembly yoke clips, is mainly due to the axial elongation of the fuel passages and the difference in elongation between the passages due to the different rates of elongation of each passage.
Since the small gap problem occurs at the reactor head face and belongs to the high dose region, the process is also based on the ALARA (radiation protection optimization) principle, which is a sequence of no process, simple intervention, removal of the positioning assembly yoke clamps and installation of the wear pad in order of complexity of the field intervention. The specific implementation mode is as follows:
1. and (3) no treatment:
when a small gap problem occurs between the main heat transmission branch pipe and the inner side of the positioning component yoke clamp at the free end of the fuel channel, the channel can stretch outwards, so that the gap can be directly judged to be increased without treatment; when a small clearance problem occurs between the main heat transfer manifold and the fuel passage end piece or the fuel passage fixed end, it is necessary to further check whether the main heat transfer manifold is supported by a cantilever hanger at the end face (fig. 1), if so, check whether there is a clearance between the hanger and the lower part of the main heat transfer manifold, if there is no clearance, then it is considered that the horizontal section of the main heat transfer manifold has no descending space, so the small clearance condition is not further deteriorated and does not need to be processed.
2. Simple intervention:
in the first step, if a gap is found between the cantilever hanger and the lower part of the main heat transfer branch pipe, the hanger is adjusted to make the hanger completely contact with the lower part of the main heat transfer branch pipe, and the descending space of the horizontal section of the main heat transfer branch pipe is eliminated. The vertical section of the main heat transmission branch pipe still sinks to a certain extent, the horizontal section is lifted due to the lever phenomenon by taking the cantilever hanging bracket as a fulcrum, and the gap is slightly increased; in addition, depending on the axial elongation of the adjacent passages and the spatial condition of the main heat transfer branch pipes between the adjacent passages, it is possible to increase the clearance by displacing the relevant fuel passage by an appropriate amount in the axial direction if the spatial condition permits.
3. Removing the positioning assembly yoke clamp:
when it is found that there is a small clearance problem between the main heat transfer legs and the outside of the fuel gallery free end locating assembly yoke clip, it is believed that contact will necessarily occur between the main heat transfer legs and the locating assembly yoke clip at some future time, since the gallery will continue to stretch outwardly. Considering that the positioning component yoke clamp of the fuel channel only realizes the axial positioning function at the fixed end of the channel, therefore, when the free end has a small gap problem, the positioning component yoke clamp can be directly dismounted to thoroughly eliminate the possibility that the main heat transmission branch pipe is collided by the positioning component yoke clamp.
4. Installing an anti-abrasion pad:
as shown in fig. 3, the main heat transfer branch pipes must be protected from wear by means of physical isolation by installing wear pads when both of the following conditions occur. One is when inspection finds that the main heat transfer manifold has contacted an adjacent locating assembly yoke clip or fuel passage end piece; another situation is that there is no way to completely eliminate the possibility of the primary heat transfer manifold coming into contact with the adjacent locating assembly yoke clip or fuel passage end piece through none of the first three processes. Installation of wear pads as shown in fig. 4, the main heat transfer manifold is isolated from the fuel gallery end piece or the locating assembly yoke clip by being secured to the target main heat transfer manifold by a pipe clamp using semi-circular carbon steel wear pads pre-fabricated for different sizes of main heat transfer manifold.
Claims (7)
1. The method for processing the problem of small gap between the water supply branch pipe and the fuel channel of the heavy water reactor unit is characterized by comprising the following steps of:
step 1: checking the gap using an endoscope and a long handle caliper;
step 2: when the clearance is less than 3.18mm, starting an evaluation process;
and step 3: intervention is performed if the gap is further reduced by the step 2 evaluation.
2. The method for treating the problem of the small gap between the water supply branch pipe and the fuel channel of the heavy water reactor set as claimed in claim 1, wherein: the caliper gauge used in the step 1 has two specifications of 5mm and 3.18 mm.
3. The method for treating the small gap between the feed water branch pipe and the fuel channel of the heavy water reactor set as claimed in claim 1, wherein: in step 1, the observation was continued when the gap was >5mm and normal, when the gap was >5mm and 3.18mm, and the evaluation was performed when the gap was <3.18 mm.
4. The method for treating the problem of the small gap between the water supply branch pipe and the fuel channel of the heavy water reactor set as claimed in claim 1, wherein: the step 2 includes the following cases,
when a small gap occurs below the main heat transfer manifold along the upper portion of the fuel passage end piece or the upper portion of the fuel passage locating assembly, the intervention is as in step 3, intervention mode 3; if the cantilever crane exists, checking whether a gap exists between the pipe clamp of the cantilever crane and the lower end of the main heat transmission branch pipe, and if the gap exists, performing an intervention measure in an intervention mode 1 in the step 3;
when a small gap occurs between the outside of the main heat transfer manifold and the inside of the fuel passage locating assembly yoke clip, no intervention is required;
when a small gap occurs between the inside of the main heat transfer manifold and the outside of the fuel passage positioning assembly yoke clip, the intervention is as in step 3, intervention mode 2;
when a small gap occurs between the position of the 3-6 point or the position of the 6-9 point of the main heat transfer branch pipe and the inner side or the outer side of the yoke clip of the fuel passage positioning assembly, the condition is combined with the above 3 conditions to determine whether to intervene and the intervention mode used;
in the 4 cases described above, if the main heat transfer manifold has been brought into contact with the fuel gallery end assembly or locating assembly yoke clamps, intervention mode 2 or intervention mode 3 in step 3 is performed directly, with the intervention mode being determined in particular according to the actual position of the contact.
5. The method for treating the small gap between the feed water branch pipe and the fuel channel of the heavy water reactor set as claimed in claim 1, wherein the pre-drying mode in the step 3 comprises the following steps:
intervention mode 1: the pull rod bolt of the main heat transmission branch pipe cantilever hanger is screwed, so that the gap between the pipe clamp and the lower edge of the main heat transmission branch pipe is eliminated, and the main heat transmission branch pipe is limited from further sinking.
6. The method for treating the small gap between the feed water branch pipe and the fuel channel of the heavy water reactor set as claimed in claim 1, wherein the pre-drying mode in the step 3 comprises the following steps:
and (3) intervention mode 2: the locating assembly yoke clip at the free end of the fuel passageway is removed.
7. The method for treating the small gap between the feed water branch pipe and the fuel channel of the heavy water reactor set as claimed in claim 1, wherein the pre-drying mode in the step 3 comprises the following steps:
intervention mode 3: the main heat transfer branch pipe is provided with the wear-resistant pad in a physical isolation mode, and the main heat transfer branch pipe is separated from the fuel passage end part or the fuel passage positioning assembly yoke clamp at a small gap or a place where contact occurs, so that collision and abrasion are avoided.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110356846.9A CN115171929A (en) | 2021-04-01 | 2021-04-01 | Method for processing small gap between water supply branch pipe and fuel channel of heavy water reactor set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110356846.9A CN115171929A (en) | 2021-04-01 | 2021-04-01 | Method for processing small gap between water supply branch pipe and fuel channel of heavy water reactor set |
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