CN110211714A - A kind of reactor pressure vessel kingbolt tensile loads technique - Google Patents
A kind of reactor pressure vessel kingbolt tensile loads technique Download PDFInfo
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- CN110211714A CN110211714A CN201910542347.1A CN201910542347A CN110211714A CN 110211714 A CN110211714 A CN 110211714A CN 201910542347 A CN201910542347 A CN 201910542347A CN 110211714 A CN110211714 A CN 110211714A
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- kingbolt
- tensile loads
- amount
- tension
- pressure vessel
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Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
-
- 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
Abstract
A kind of reactor pressure vessel kingbolt tensile loads technique, belongs to nuclear power plant's reactor pressure vessel service technique field.The present invention includes the following steps: step 1, and all kingbolts are pressed with the circumferencial direction number consecutively of top cover flange, and is equally divided into several groups, and multiple kingbolts in every group are uniformly distributed along the circumferencial direction of top cover flange；Step 2,100% target load is successively used to stretch according to group sequence uniformly distributed multiple groups kingbolt；Step 3, step loading is successively used to stretch for 120%-100% target load according to group sequence all kingbolts；Step 4,100% target load is used to stretch again the multiple groups kingbolt for using 120% target load first to be stretched in step 3.The draw efficiency when present invention can be effectively improved using monomer-type bolt stretching machine reduces kingbolt amount of tension and adjusts number, reduces the overhaul main line time.
Description
Technical field
The present invention relates to nuclear power plant's reactor pressure vessel service technique field more particularly to a kind of reactor pressure vessels
Kingbolt tensile loads technique.
Background technique
Nuclear power plant's reactor pressure vessel kingbolt prefastening load is big and required precision is high, and domestic and international PWR nuclear power plant is adopted
Tensile loads are carried out to kingbolt with hydraulic stud tensioner.The tensile loads of bolt can be divided into synchronous integrally stretching and stage by stage
Two kinds of step drawing.Synchronous integrally stretching refers to the stretching-machine with quantity identical as kingbolt, while carrying out to all kingbolts
Tensile loads, part nuclear power plant reactor pressure vessel kingbolt pre-tighten the synchronization integrally stretching for using monoblock type bolt stretching machine
Technology.Due to the limitation of bolt stretching machine quantity and refuelling pool lifting space limitation, there is part nuclear power station that can only use monomer-type
Bolt stretching machine stage by stage, step drawing technology.The synchronization integrally stretching technology of bolt is the operation settled at one go, speed
Fastly, simple process.And stage by stage, step drawing technology it is complex.
But several factors are had in actual production influences the use of monoblock type bolt stretching machine, so that can only use
Monomer-type bolt stretching machine carries out stretched operation.Such as certain type nuclear power unit because the integrated heap top installed on reactor lid it is cold
But blower hinders the lifting of monoblock type bolt stretching machine, therefore can only use the substep stage by stage of monomer-type bolt stretching machine.Also have
Nuclear power plant needs temporarily to use monomer-type bolt stretching machine because of monoblock type bolt stretching machine failure.
During reactor pressure vessel buckle closure, need using three or four monomer-type bolt stretching machines to all kingbolts
Synchronous midplane extrusion is generally divided to two to three phases, target amount of tension is gradually loaded onto, to the main spiral shell for being unsatisfactory for amount of tension requirement
Bolt is adjusted individually.Kingbolt tensile loads account for overhaul critical path, generally require 4~6 hours.
Summary of the invention
The purpose of the present invention is to solve the above-mentioned problems of the prior art, provide a kind of reactor pressure vessel master
Bolt tension loading process, draw efficiency when can effectively improve using monomer-type bolt stretching machine reduce kingbolt and draw
The amount of stretching adjusts number, reduces the overhaul main line time.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of reactor pressure vessel kingbolt tensile loads technique, includes the following steps:
Step 1, all kingbolts are pressed with the circumferencial direction number consecutively of top cover flange, and is equally divided into several groups, in every group
Multiple kingbolts are uniformly distributed along the circumferencial direction of top cover flange；
Step 2,100% target load is successively used to stretch according to group sequence uniformly distributed multiple groups kingbolt；
Step 3, step loading is successively used to stretch for 120%-100% target load according to group sequence all kingbolts；
Step 4,100% target load is used again to the multiple groups kingbolt for using 120% target load first to be stretched in step 3
It is stretched.
For the present invention by setting two stages for kingbolt tensile loads, step 2 is first stage, step 3 and step 4
For second stage, the first stage reduces stretching step number, and second stage increases step loading span, thus reduce need to adjust it is pre-
The kingbolt quantity of tight load, improves tensile loads efficiency, shortens the overhaul main line time, reduces personnel's total dose.
Preferably as the present invention, before the step 2 further include: install and stretch in the central through hole of each kingbolt
Gauge rod is measured, the initial depth L0 of central through hole is measured and recorded；After the step 4 further include: measure and record each
The depth L1 of central through hole after kingbolt stretching, calculates amount of tension L=L1-L0.
As it is of the invention preferably, after the amount of tension of kingbolt is calculated, judge each kingbolt amount of tension L whether
Within the scope of normal stretch amount, if it is not, then needing to be adjusted the amount of tension of kingbolt.
Preferably as the present invention, the normal stretch range is 1.40mm-1.50mm.
Preferably as the present invention, the amount of tension of kingbolt is adjusted method particularly includes: if PA>PTBM, then to main spiral shell
Bolt carries out tensile loads；If PA<PTBM, then three-point bending beam is carried out to kingbolt；PA=PTBM*LN/LTBM, wherein PAFor amount of tension tune
Goal pressure when whole, PTBMThe goal pressure when last time carried out before adjusting amount of tension by kingbolt stretches, LN
For kingbolt amount of tension under normal circumstances, LTBMAmount of tension for the kingbolt for needing to be adjusted.
Preferably as the present invention, if PA>PTBM, then P is set by tensile loadA, carry out normal tensile loads operation.
Preferably as the present invention, if PA<PTBM, then the intermediate pressure value that stretching is arranged is PTBM, increase manually stretch every time
Pressure value 100psi, and attempt to unscrew main nut, until main nut loosens；Rotation main nut rotating handle 6 is enclosed counterclockwise, then
Bolt stretching machine pressure is down to PA, tighten main nut.
Preferably as the present invention, the multiple groups kingbolt stretched in the step 2 is last several in the step 3
Group is stretched.
Preferably as the present invention, before being stretched every time to kingbolt, bolt is installed on 2 kingbolts of its two sides and is protected
Sheath.
Preferably as the present invention, for kingbolt grouping method particularly includes: the kingbolt for being divided into 120 ° between every 3 is one
Group.
The invention has the advantages that step 2 is first stage, step by setting two stages for kingbolt tensile loads
Rapid 3 and step 4 be second stage, the first stage reduces stretching step number, and second stage increases step loading span, to reduce
The kingbolt quantity that prefastening load need to be adjusted improves tensile loads efficiency, shortens the overhaul main line time, reduces personnel total spoke
According to dosage.
Detailed description of the invention
Fig. 1 is the flow chart of one embodiment of the present invention；
Fig. 2 is schematic diagram of the present invention to kingbolt number.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
A kind of reactor pressure vessel kingbolt tensile loads technique, includes the following steps:
Step 1, all kingbolts are pressed with the circumferencial direction number consecutively of top cover flange, and is equally divided into several groups, in every group
Multiple kingbolts are uniformly distributed along the circumferencial direction of top cover flange；
Step 2,100% target load is successively used to stretch according to group sequence uniformly distributed multiple groups kingbolt；Described group of sequence only refers to
It is stretched a group by a group, is not necessarily referring to the sequence according to group #, similarly hereinafter；
Step 3, step loading is successively used to stretch for 120%-100% target load according to group sequence all kingbolts；
Step 4,100% target load is used again to the multiple groups kingbolt for using 120% target load first to be stretched in step 3
It is stretched.
Specifically, before the step 2 further include: installation stretches measurement in the central through hole of each kingbolt
Bar measures and records the initial depth L0 of central through hole；After the step 4 further include: measure and record each kingbolt
The depth L1 of central through hole after stretching calculates amount of tension L=L1-L0.Then judge each kingbolt amount of tension L whether
In normal stretch amount range (1.40mm-1.50mm), if it is not, then needing to be adjusted the amount of tension of kingbolt.
The amount of tension of kingbolt is adjusted method particularly includes: if PA>PTBM, then tensile loads are carried out to kingbolt；
If PA<PTBM, then three-point bending beam is carried out to kingbolt；PA=PTBM*LN/LTBM, wherein PAGoal pressure when being adjusted for amount of tension,
PTBMThe goal pressure when last time carried out before adjusting amount of tension by kingbolt stretches, LNFor under normal circumstances
Kingbolt amount of tension, LTBMAmount of tension for the kingbolt for needing to be adjusted.
If PA>PTBM, then P is set by tensile loadA, carry out normal tensile loads operation.
If PA<PTBM, then the intermediate pressure value that stretching is arranged is PTBM, increase manually stretch pressure value 100psi every time, and
Main nut is unscrewed in trial, until main nut loosens；Rotation main nut rotating handle 6 is enclosed counterclockwise, then by bolt stretching machine pressure
Power is down to PA, tighten main nut.
It is illustrated so that certain has the nuclear-power reactor pressure vessel of 45 kingbolts as an example below, 45 kingbolts are along top
The circumferencial direction of lid flange is uniformly distributed.First to this 45 kingbolts along the circumferencial direction number consecutively 1-45 of top cover flange, so
It is pressed every 3 one group afterwards, is divided into 15 groups, and 3 kingbolts in every group are equally uniformly distributed in the circumference of top cover flange
On, that is, 120 ° are spaced, symmetrically stress when ensuring to stretch every group of kingbolt.
Then, tensile loads data are inputted into three monomer-type bolt stretching machines:
A, tensile loads and uninstall parms need to be input to bolt stretching machine before hanging in refuelling pool bottom by bolt stretching machine
On.
B, the power supply of a bolt stretching machine is connected, it is ensured that in addition two bolt stretching machines are in off-position.
C, setting bolt stretching machine is main state of a control.
D, according to table 1, kingbolt tensile loads operation relevant parameter is input to bolt stretching machine.
E, after the completion of parameter input, auxiliary state of a control is set by the bolt stretching machine, is then shut down.
F, the parameter input that b ~ e completes three bolt stretching machines is repeated.
Certain the nuclear power station kingbolt tensile loads table of table 1
As seen from the above table, the 5 groups of kingbolts stretched in first stage namely step 2 are equally distributed, this 5 groups of main spiral shells
Numbering in bolt the smallest is 1,4,7,10,13 respectively, and numbering medium is 16,19,22,25,28 respectively, the largest number of difference
31,34,37,40,43, i.e., between be divided into 2 kingbolts, around top cover flange one week.But the sequence of stretching not according to
Said sequence, but in order to guarantee the uniform force of top cover flange during the entire stretching process as far as possible, using above table
In drawing sequence.
Step 3 in second stage, since drawn is excessively primary for above-mentioned 5 groups of kingbolts, so carry out in step 3
When the stretching of whole kingbolts, last 5 groups that above-mentioned 5 groups of kingbolts are placed on this step are stretched.Meanwhile we can be from
See in table, from the specific change procedure of 120%-100% target load, first 5 groups are all made of the step loading used in step 3
120% target load is stretched, and is gradually decrease to 100% target load later.With step 2, the sequence of stretching is as far as possible
Guarantee the uniform force of top cover flange during the entire stretching process.
Step 4 in second stage, the kingbolt stretched to first 5 groups in step 3 using 120% target load is again
It is stretched using 100% target load.
Specific stretched operation:
G, it measures the initial depth of 45 measuring rods and records L0.Measurement process will have special messenger's monitoring, it is ensured that measurement and record are quasi-
It is really errorless.
H, it is hung with ring and three bolt stretching machines is successively hung refuelling pool bottom of pond pressure vessel 1,16 with heap top cucurbit
Number, near No. 31 bolts.
I, according to 1 kingbolt loading sequence table of table, it is ensured that will have been installed on 2 kingbolts near the kingbolt of stretching
Bolt protection case.
J, it is promoted with heap top cucurbit and bolt stretching machine in place is into table 1 on the kingbolt of the first step.
K, operation armful and system, make bolt stretching machine obvolvent kingbolt.
M, bolt stretching machine boosts to 100% target load, and bolt stretching machine boost process requires to synchronize, it is ensured that top cover method
Blue uniform force.
N, main nut is tightened with identical torque, then releasing lever system.
O, according to bolt stretching machine loading sequence, heap top cucurbit is operated by bolt stretching machine in place to next group of kingbolt,
And it is sequentially completed the drawing work of whole kingbolts.
Then, the amount of tension of kingbolt is measured and is calculated:
P, confirmation obvolvent switch unclamps, and the operation interface of three bolt stretching machines is return back to main interface.
Q, three bolt stretching machines are transferred from top cover, are temporarily stored in refuelling pool height and step up.
R, it measures kingbolt length (the i.e. central through hole depth) L1 after stretching and records.
S, amount of tension L=L0-L1 of every kingbolt is calculated, confirms result whether in normal stretch amount range (1.40-
1.50 ㎜) in, if there is kingbolt amount of tension to be unsatisfactory for requiring, need to be adjusted.
Finally, being adjusted to underproof kingbolt amount of tension:
Because material is different with elasticity modulus of materials caused by processing and manufacturing error, amount of tension is unsatisfactory for requiring individual kingbolts
When, it is calculated according to the following formula, if PA>PTBM, then tensile loads are carried out to kingbolt；If PA<PTBM, then to kingbolt into
Row three-point bending beam；PA=PTBM*LN/LTBM, wherein PAGoal pressure when being adjusted for amount of tension, PTBMIt is stretched for kingbolt in adjustment
The goal pressure when last time carried out before amount stretches, LNFor kingbolt amount of tension under normal circumstances, LTBMTo need
The amount of tension for the kingbolt being adjusted.
When carrying out tensile loads adjustment to kingbolt, tensile load is set as target pressure value PA, loaded with normal stretch
It operates identical.
When carrying out three-point bending beam adjustment to kingbolt, the intermediate pressure value that stretching is arranged is PTBM, increase manually stretch every time
Pressure value 100psi, and attempt to unscrew main nut, until main nut loosens.Rotation main nut rotating handle 6 is enclosed counterclockwise, then
Bolt stretching machine pressure is down to target pressure value PA, tighten main nut.
After amount of tension adjusts, measurement and calculating are re-started to the amount of tension of 45 kingbolts, and confirmed all full
Foot requires.
The foregoing is only a preferred embodiment of the present invention, the specific embodiment is whole based on the present invention
A kind of implementation under design, and scope of protection of the present invention is not limited thereto, any skill for being familiar with the art
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by art personnel, should all cover in protection of the invention
Within the scope of.Therefore, the scope of protection of the invention shall be subject to the scope of protection specified in the patent claim.
Claims (10)
1. a kind of reactor pressure vessel kingbolt tensile loads technique, which comprises the steps of:
Step 1, all kingbolts are pressed with the circumferencial direction number consecutively of top cover flange, and is equally divided into several groups, in every group
Multiple kingbolts are uniformly distributed along the circumferencial direction of top cover flange；
Step 2,100% target load is successively used to stretch according to group sequence uniformly distributed multiple groups kingbolt；
Step 3, step loading is successively used to stretch for 120%-100% target load according to group sequence all kingbolts；
Step 4,100% target load is used again to the multiple groups kingbolt for using 120% target load first to be stretched in step 3
It is stretched.
2. reactor pressure vessel kingbolt tensile loads technique according to claim 1, which is characterized in that in the step
Before rapid 2 further include: amount of tension measuring rod is installed in the central through hole of each kingbolt, measures and records the first of central through hole
Beginning depth L0；After the step 4 further include: the depth L1 of the central through hole after each kingbolt stretches is measured and recorded,
Calculate amount of tension L=L1-L0.
3. reactor pressure vessel kingbolt tensile loads technique according to claim 2, which is characterized in that be calculated
After the amount of tension of kingbolt, the amount of tension L of each kingbolt is judged whether within the scope of normal stretch amount, if it is not, then needing pair
The amount of tension of kingbolt is adjusted.
4. reactor pressure vessel kingbolt tensile loads technique according to claim 3, which is characterized in that described normal
Range of stretch is 1.40mm-1.50mm.
5. reactor pressure vessel kingbolt tensile loads technique according to claim 3, which is characterized in that kingbolt
Amount of tension be adjusted method particularly includes: if PA>PTBM, then tensile loads are carried out to kingbolt；If PA<PTBM, then to main spiral shell
Bolt carries out three-point bending beam；PA=PTBM*LN/LTBM, wherein PAGoal pressure when being adjusted for amount of tension, PTBMIt is being adjusted for kingbolt
The goal pressure when last time carried out before amount of tension stretches, LNFor kingbolt amount of tension under normal circumstances, LTBMFor
The amount of tension for the kingbolt for needing to be adjusted.
6. reactor pressure vessel kingbolt tensile loads technique according to claim 5, which is characterized in that if PA>PTBM,
Then P is set by tensile loadA, carry out normal tensile loads operation.
7. reactor pressure vessel kingbolt tensile loads technique according to claim 5, which is characterized in that if PA<PTBM,
The intermediate pressure value that stretching is then arranged is PTBM, increase manually stretch pressure value 100psi every time, and attempt to unscrew main nut, directly
It is loosened to main nut；Rotation main nut rotating handle 6 is enclosed counterclockwise, and bolt stretching machine pressure is then down to PA, tighten main spiral shell
It is female.
8. reactor pressure vessel kingbolt tensile loads technique according to claim 1, which is characterized in that the step
The multiple groups kingbolt stretched in 2, last several groups in the step 3 are stretched.
9. reactor pressure vessel kingbolt tensile loads technique according to claim 1, which is characterized in that every time to master
Before bolt is stretched, bolt protection case is installed on 2 kingbolts of its two sides.
10. reactor pressure vessel kingbolt tensile loads technique according to claim 1, which is characterized in that for master
Bolt grouping method particularly includes: the kingbolt that 120 ° are divided between every 3 is one group.
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| CN201910542347.1A CN110211714B (en) | 2019-06-21 | 2019-06-21 | Reactor pressure vessel main bolt tension loading process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112025625A (en) * | 2020-08-06 | 2020-12-04 | 岭东核电有限公司 | Reactor pressure vessel main bolt stretching operation method and pressure vessel cover closing method |
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