CN217060284U - Control rod is from taking cable inspection to maintain connecting device - Google Patents

Abstract

The utility model belongs to nuclear power station equipment operation overhauls technique, concretely relates to connecting device is maintained in control rod from taking cable inspection. The cable inspection device comprises a pipe wall, an end cover A and an end cover B, wherein a cable to be inspected is positioned in the pipe wall; core wire leading-out holes are processed on the end cover A and the end cover B, and pins are arranged at the leading-out holes; the core wire in the cable is led out through a pin; the pins at the end parts are connected through connecting wires, so that all core wires in the pipe wall are connected in series, and a uniform test connecting end is led out from the end cover A or the end cover B. Compared with the prior art that the pore channels of all the core wires of the control rod self-contained cable are measured in sequence, the pore channels of all the core wires in one control rod self-contained cable can be measured quickly. The core hole channels of the control rod self-electrified cable end are large in number, and the handheld meter pen is easy to miss intervals in a measuring mode of inserting the core hole channels.

Description

Control rod is from taking cable inspection to maintain connecting device

Technical Field

The utility model belongs to nuclear power station equipment operation overhauls technique, concretely relates to control rod is from taking cable inspection to maintain connecting device.

Background

The control rod is used as an important component in a reactor of the nuclear power station, and is related to whether the nuclear power station can safely and stably operate to generate power. The control rods are arranged in the preformed holes of the fuel assembly, the upper end of each control rod is fixedly connected with the driving mechanism, and the control rods move up and down in the reactor core along with the driving rod of the driving mechanism or are kept at any height in the reactor core, so that the power of the reactor is adjusted. The control rod position sensor is fixed in the driving rod of the driving mechanism, measures the position of the control rod in the reactor core, and transmits a signal to the reactor control protection system to realize the monitoring of the rod position. The reactor control protection system can receive emergency protection and pre-protection signals triggered by the safety instrument control system and also receive manually triggered emergency protection and pre-protection signals, and emergency shutdown and power control of the reactor are realized by dropping a control rod and inserting the control rod downwards.

The control rod driving mechanism and the rod position sensor are connected with an upper system cabinet through a control rod cable, and power supply and data transmission of equipment are achieved. The control rod self-contained cable is divided into a power self-contained cable and an instrument self-contained cable according to the functional difference and the power supply type of the control rod driving mechanism and the rod position sensor. The end of the power self-electrified cable is provided with 7 cable core wire pore canals, and the number of practically used pore canals 1, 2, 3, 5, 6 and 7 is 6, and the pore canals are respectively used for transmitting and supplying power for lifting, locking and fixing coils of the control rod driving mechanism; the instrument control self-carrying cable end is provided with 24 cable core wire pore channels, and practically uses 12 pore channels of No. 1, 2, 3, 4, 5, 7, 9, 10, 12, 13, 21 and 24, and transmits feedback voltage of 9 coils while transmitting power supply for the 9 coils of the rod position sensor. Each bundle of control rods is provided with a power self-contained cable and an instrument self-contained cable which are fixed on a protective steel structure platform of the reactor pressure vessel upper assembly, and the end head of the control rod self-contained cable is fastened with the end head on the reactor cement wall side and the end head on the control rod driving mechanism side (rod position sensor side) in a threaded tightening mode.

The control rod driving mechanism is powered by an independent bus, and a power supply line passes through an instrument control cabinet of the reactor control protection system and then is connected with the reactor core cement wall side and the control rod driving mechanism side through a power self-contained cable of a control rod. Lifting, locking and fixing the electromagnetic coil in the driving mechanism enable the pawl of the driving mechanism to drive the driving rod to move up and down or to be still according to given time sequence current. The reactor control protection system is connected with the reactor core cement wall side and the control rod position sensor side through a self-contained control cable of a control rod, so that power supply to the control rod position sensor is realized; meanwhile, the instrument control self-contained cable transmits a feedback signal of a control rod position sensor coil to an instrument control cabinet of the reactor control protection system, and the position of the control rod is displayed after the feedback signal is processed by the cabinet. In conclusion, the normal operation of the control rods with the cables is closely related to the safe and stable operation of the reactor.

In order to ensure the working performance of the control rod self-contained cable, insulation measurement and conductivity inspection of all the control rod self-contained cables which are put into use and are standby on a protection steel structure platform are required after the protection steel structure is lifted out of a reactor core area during unit refueling and overhaul.

During inspection, workers need to wear radiation protection articles (such as paper coats, rubber gloves, shoe covers and splash-proof masks) on a protection steel structure platform, and a universal meter and a megohmmeter are used for sequentially inspecting core wire pore passages at positions where the power self-contained cables and the instrument control self-contained cables account for 2178. As shown in fig. 2 and 3, the power self-electrified cable terminal comprises a cable terminal shell, a clamping groove, cable core wire ducts and the like, which are numbered from left to right and from top to bottom, and have 7 core wire ducts in total; the instrument control self-contained cable end comprises a cable end shell, a clamping groove, cable core wire pore channels and the like, which are numbered from left to right and from top to bottom, and the total number of the pore channels is 24.

When carrying out control rod from taking cable conductivity inspection, the staff need dress the safety belt, accomplishes at the not co-ordination of co-altitude platform. Due to the fact that the number of the working objects is large, the lighting condition of the working environment is limited, when a worker holds a stylus and inserts into a cable core wire hole channel, the interval is prone to being wrong, working accuracy is affected, in addition, the working environment is high in temperature and the environment has a certain dosage rate, working time consumption is long, physical challenge of the worker is large, high collective exposure dose is caused, and the phenomenon of heatstroke of the worker happens for many times.

Disclosure of Invention

The utility model aims at providing a connecting device is maintained from taking cable inspection to control rod, at the control rod from taking cable inspection maintenance work, quick, accurate connecting cable end to measure cable insulation and switching on, improve work efficiency, shorten operating time, greatly reduced receives illumination dosage and personnel heatstroke risk.

The technical scheme of the utility model as follows:

a control rod self-contained cable inspection maintenance connecting device comprises a pipe wall, an end cover A and an end cover B, wherein the end cover A and the end cover B are arranged at two ends of the pipe wall;

core wire leading-out holes are processed on the end cover A and the end cover B, and pins are arranged at the leading-out holes;

the core wire in the cable is led out through a pin;

the pins at the end parts are connected through the connecting wires, all core wires in the pipe wall are connected in series, and the uniform test connecting ends are led out from the end cover A and the end cover B.

The test connecting end is connected with a measuring instrument.

And a heat-shrinkable sleeve is arranged on the pin.

The number of the core wires in the cable is 6 or 12.

6 heart yearns be fixed in the A end cover and the B end cover at pipe wall both ends through the stitch respectively, establish ties the heart yearn through the connecting wire according to the order for all heart yearns that use establish ties the back, form unified test connection end at A end cover or B end cover.

The 12 core wires are fixed on the end covers A and B at two ends of the pipe wall through pins respectively, and the core wires are connected in series through the connecting wires in sequence, so that after all used core wires are connected in series, a unified test connecting end is formed on the end cover A or the end cover B.

The measuring instrument is a universal meter or a megohmmeter.

The utility model discloses the effect as follows:

1) the speed is high: compared with the prior art that the pore of each core wire of the control rod self-contained cable is measured in sequence, the method can realize the rapid measurement of the pore of all the core wires in one control rod self-contained cable;

2) the accuracy is high: the core hole channels of the control rod self-electrified cable end are large in number, so that the measurement mode that the hand-held meter pen is inserted into the core hole channels is easy to miss intervals, the risk of missing intervals is completely avoided, and the working accuracy is greatly improved;

3) installation is convenient: according to the structural characteristics of the control rod self-charged cable end, the control rod self-charged cable end can be quickly and conveniently installed on the cable end;

4) can be repeatedly used: because the surface of the working object is contaminated, the subsequent work can be reused after the first use is contaminated, and a large amount of solid contaminated waste can not be generated;

5) humanized design: greatly reducing the working intensity of workers, reducing the irradiated dose of the workers and avoiding the heatstroke risk of the workers.

Use power to take cable inspection from taking and maintain as an example, the staff only need can accomplish work at same platform, need not to accomplish at a plurality of platforms mutually supporting, and work object (heart yearn) reduces to 242 from 2178, reduces 1936 totally, greatly reduced staff's physical demands, shortened operating time, avoided the emergence of personnel's heatstroke incident, reduced staff's the dose of being shone.

Drawings

FIG. 1 is a schematic illustration of a control rod with its own cable;

in the figure: 101. the cable reactor cement wall side end; 102. a cable; 103. and the end head of the cable reactor driving mechanism side (rod position sensor side).

FIG. 2 is a schematic view of a power self-contained cable end;

FIG. 3 is a schematic view of an instrumented self-contained cable tip;

in the figure: 201. a cable termination shell; 202. a card slot; 203. cable core hole

FIG. 4 is a front view of the control rod self-contained cable inspection and maintenance interface;

FIG. 5 is a front view of the control rod self-contained cable inspection and maintenance connection device A;

FIG. 6 is an end view of the control rod self-contained cable inspection and maintenance connection A;

FIG. 7 is a front view of the B end of the control rod self-contained cable inspection and maintenance connection device;

FIG. 8 is an end view of the control rod self-contained cable inspection and maintenance connection B;

in the figure: 1. a tube wall; 2. a stitch; 3. heat-shrinkable tubing; 4. a connecting wire; 5. a base; 6, end cover A; 7, end cover B; 8. a measuring instrument.

Detailed Description

The invention is further illustrated by the accompanying drawings and the detailed description.

As shown in fig. 4, the connection device comprises a pipe wall 1, an end cover a 6 and an end cover B7 which are arranged at two ends of the pipe wall 1, and a cable to be inspected is positioned in the pipe wall 1.

As shown in fig. 5 to 8, taking a power self-contained cable as an example, the number of the leading-out holes of the instrument control self-contained cable is different, the arrangement of the pins 2 is different, and the rest structures are the same, and are not separately illustrated and described.

Core wire leading-out holes are processed on the end cover A6 and the end cover B7, and pins 2 are installed at the leading-out holes.

The core wire in the cable is led out through a pin 2, and a heat-shrinkable sleeve 3 is arranged on the pin 2 for insulation protection.

Different core wires in the tube wall are connected in series through connecting wires 4.

The device is suitable for power self-contained cables or instrument control self-contained cables.

Power is from taking inside total 7 heart yearns of cable, has used 6 when the inspection is maintained, and 6 heart yearns are fixed in A end cover 6 and the B end cover 7 at 1 both ends of pipe wall through stitch 2 respectively, establish ties the heart yearn through connecting wire 4 according to the order for all heart yearns of using establish ties the back, form unified test connection end at A or B end, connect measuring instrument 8 at two test connection ends, can carry out corresponding detection.

Instrument control is from taking inside 24 heart yearns altogether of cable, has used 12 when the inspection is maintained, and 12 heart yearns are fixed in A end cover 6 and the B end cover 7 at 1 both ends of pipe wall through stitch 2 respectively, establish ties the heart yearn through connecting wire 4 according to the order for all heart yearns of using establish ties the back, form unified test connection end at A or B end, connect measuring instrument 8 at two test connection ends, can carry out corresponding detection.

The measuring instrument 8 is a multimeter or a megohmmeter, and is used for measuring resistance gears, measuring conductivity and measuring insulativity respectively.

When power self-contained cables or instrument control self-contained cables are checked and maintained, two connecting wires led out from a B end (or an A end) are respectively connected to a red meter pen and a black meter pen of a universal meter, and resistance gears of the universal meter are used for measuring conductivity; when the earth insulation is measured, any one of the connecting wires led out from the B end is connected to a red meter pen of the megohmmeter, the other connecting wire is well protected in an insulation mode, the black meter pen of the megohmmeter is grounded, and the corresponding gear of the megohmmeter is used for measuring the insulation.

Claims (6)

1. The utility model provides a control rod is from taking cable inspection to maintain connecting device which characterized in that: the cable inspection device comprises a pipe wall (1), an end cover A (6) and an end cover B (7) which are arranged at two ends of the pipe wall (1), wherein a cable to be inspected is positioned in the pipe wall (1);

core wire leading-out holes are processed on the end cover A (6) and the end cover B (7), and pins (2) are installed at the leading-out holes;

the core wire in the cable is led out through a pin (2);

the pins (2) at the end parts are connected through the connecting wires (4), so that all core wires in the pipe wall are connected in series, and uniform test connecting ends are led out from the end cover A (6) and the end cover B (7).

2. The control rod-included cable inspection and maintenance connection as set forth in claim 1, wherein: the test connecting end is connected with a measuring instrument (8).

3. The control rod-included cable inspection and maintenance connection as set forth in claim 1, wherein: and a heat-shrinkable sleeve (3) is arranged on the pin (2).

4. The control rod-included cable inspection and maintenance connection as set forth in claim 1, wherein: the number of the core wires in the cable is 6 or 12.

5. The control rod-included cable inspection and maintenance connection as set forth in claim 4, wherein: 6 heart yearns be fixed in A end cover (6) and B end cover (7) at pipe wall (1) both ends through stitch (2) respectively, establish ties the heart yearn through connecting wire (4) according to the order for all heart yearns of using establish ties the back, form unified test connection end at A end cover (6) or B end cover (7).

6. The control rod-included cable inspection and maintenance connection as set forth in claim 4, wherein: 12 heart yearns be fixed in A end cover (6) and B end cover (7) at pipe wall (1) both ends through stitch (2) respectively, establish ties the heart yearn through connecting wire (4) according to the order for all heart yearns of using establish ties the back, form unified test connection end at A end cover (6) or B end cover (7).

Images