CN220962812U - Nuclear reaction cooling liquid measuring rod - Google Patents

Abstract

The application belongs to the field of nuclear industry detection, and particularly relates to a nuclear reaction cooling liquid measuring rod, which comprises a shell, a core rod and a measuring assembly, wherein the shell is provided with a through hole along the axis of the shell, the core rod is suspended in the through hole, and a uniform gap exists between the side surface of the core rod and the inner wall of the shell; the shell and the core rod are fixedly connected with the measuring assembly at the same end, the shell and the core rod are made of conductors, the nuclear reaction cooling liquid measuring rod is configured to be inserted into the nuclear reaction cooling liquid at one end deviating from the measuring assembly, and the measuring assembly is used for measuring the resistance between the connecting end of the shell and the measuring assembly and between the core rod and the connecting end of the measuring assembly. The application has the effect of reducing nuclear radiation leakage in the observation process.

Description

Nuclear reaction cooling liquid measuring rod

Technical Field

The application relates to the field of nuclear industry detection, in particular to a nuclear reaction cooling liquid measuring rod.

Background

In the process of nuclear industry, in order to reduce the temperature of the reactor core, a cooling liquid needs to be introduced into the reactor pressure shell, and the liquid level of the cooling liquid is an important working parameter of the reactor.

The observation of the liquid level of the cooling liquid by related equipment is that a transparent observation window is arranged on the side wall of the reactor pressure shell where the cooling liquid is positioned, or a liquid level guide pipe is communicated with the side wall of the reactor pressure shell, and the liquid level of the cooling liquid is reflected by the liquid level of the liquid level guide pipe under the principle of a communicating vessel.

However, the liquid level conduit and the observation window have weaker isolation capability to nuclear radiation than the reactor pressure shell, and the cooling liquid has higher radioactivity because of direct contact with the reactor, which causes harm to the health and safety of operators.

Disclosure of utility model

In order to solve the problems, the application provides a nuclear reaction cooling liquid measuring rod which reduces nuclear radiation leakage in the observation process.

The application provides a nuclear reaction cooling liquid measuring rod which adopts the following technical scheme:

The nuclear reaction cooling liquid measuring rod comprises a shell, a core rod and a measuring assembly, wherein a through hole is formed in the shell along the axis of the shell, the core rod is suspended in the through hole, and a uniform gap exists between the side surface of the core rod and the inner wall of the shell; the shell and the core rod are fixedly connected with the measuring assembly at the same end, the shell and the core rod are made of conductors, the nuclear reaction cooling liquid measuring rod is configured to be inserted into the nuclear reaction cooling liquid at one end deviating from the measuring assembly, and the measuring assembly is used for measuring the resistance between the shell and the connecting end of the measuring assembly and between the core rod and the connecting end of the measuring assembly.

By adopting the technical scheme, the liquid level of the nuclear reaction cooling liquid is measured without depending on an observation window or a liquid level conduit, and the whole nuclear reaction cooling liquid measuring rod is arranged in the reactor pressure shell, so that the tightness of the whole reactor core and cooling liquid is ensured, and nuclear radiation leakage is prevented; compared with the original manual observation, the measurement result of the application is directly output as an electric signal, no manual participation is needed, the contact frequency of the staff and the reactor is reduced, and the health and safety of the staff are further protected.

Optionally, one end of the shell far away from the measuring component is sealed by a soft film, a cavity formed by the soft film and the shell is filled with a conductive liquid, and the soft film can deform under a pressure difference, so that the conductive liquid in the shell is flush with a nuclear reaction cooling liquid outside the shell.

By adopting the technical scheme, the core rod of the measuring rod is immersed in the conductive liquid and is not in direct contact with the nuclear reaction cooling liquid, so that the corrosion of the nuclear reaction cooling liquid to the core rod is prevented, and the stability of the measuring element and the accuracy of the measuring data are ensured; in addition, the conductivity of the conductive liquid can be adapted according to the range of the measuring assembly, so that the problem that the accuracy of the measuring assembly is too high due to the fact that the resistance of the nuclear reaction cooling liquid is too small is avoided.

Optionally, the diameter of the through hole is larger at the end near the flexible membrane than at the end near the measuring component.

By adopting the technical scheme, the soft film slightly floats, the end, close to the measuring assembly, of the shell can be amplified, the shape and the size of the through hole are reasonably configured, the volume of the liquid column between the upper limit liquid level and the lower limit liquid level in the through hole can be corresponding to the soft film and is only slightly concave or convex, and the mapping of the full range is realized by smaller soft film deformation.

Optionally, a supporting net is arranged at one end of the soft film far away from the measuring assembly, and is used for bearing the soft film and preventing the soft film from falling out of the through hole.

By adopting the technical scheme, the soft film is always positioned in the shell, so that the unexpected situation that the soft film is attached to the outer wall of the shell by nuclear reaction cooling hydraulic pressure with rising liquid level after being pulled out of the shell under the action of pressure difference is avoided.

Optionally, the soft membrane is circular, the core rod is close to one end of the soft membrane and is provided with a corrosion-resistant end sleeve, the outer circle of the soft membrane is fixed with the shell in a sealing way, and the inner circle of the soft membrane is fixed with the corrosion-resistant end sleeve in a sealing way.

By adopting the technical scheme, when the liquid level of the nuclear reaction cooling liquid rises, the soft film is concave under the action of pressure difference, and the soft film cannot interfere with the core rod.

Optionally, the core rod is a resistor rod with uniform conductivity.

By adopting the technical scheme, the resistance change detected by the measuring assembly comes from two factors, namely, after the liquid level rises, the electric conduction liquid between the core rod and the shell is increased, and more paths are branched to reduce the resistance; and when the liquid level changes, the length of the core rod connected in series in the circuit changes, namely the resistivity of the series resistor changes, and under the action of two phases, the same liquid level height can cause larger parameter change, so that the measurement accuracy is higher.

Optionally, a limiting ring is sleeved on the core rod, the limiting ring is conductive and has a gap with the shell, and when the nuclear reaction cooling liquid reaches the upper limit liquid level, the liquid level in the shell is in contact with the limiting ring.

By adopting the technical scheme, under the extreme water level, the minimum gap between the core rod and the shell is determined by the limiting ring, the electric conduction liquid resistance of the position is the lowest, and the position is closest to the measuring assembly, so that when the nuclear reaction cooling liquid reaches the extreme water level, a larger proportion of the output current of the measuring assembly is shunted to the limiting ring, and the resistance of the whole circuit is suddenly reduced, thereby realizing the alarm function.

Optionally, the housing further includes a guide ring, where the guide ring is disposed at an end of the housing near the measurement assembly, and the guide ring is electrically connected to the measurement assembly.

By adopting the technical scheme, as the resistivity of the guide ring is sufficiently small compared with the whole circuit to be ignored, no matter where the electrode of the measuring assembly is arranged, the voltage at the electrode is a fixed value after the constant voltage of the guide ring, thereby ensuring that the measured data cannot accidentally fluctuate due to the arrangement of the electrode.

Optionally, external threads are arranged at two ends of the shell.

By adopting the technical scheme, the nuclear reaction cooling liquid measuring rod can be configured into a fuel rod array of a nuclear reactor and is detachably connected with the upper grid and the lower grid, so that the internal structure of the reactor pressure shell is more compact.

Optionally, the nuclear reaction cooling liquid measuring rod further comprises an end plug, the end plug is in threaded connection with the through hole, a fixing groove is formed in one end of the end plug, which is close to the core rod, the core rod is inserted into the fixing groove and is in butt joint with the end plug, a plurality of evenly distributed guide grooves are formed in the side face of the end plug, and the guide grooves penetrate through the whole end plug along the axial direction of the end plug.

By adopting the technical scheme, one end of the core rod is fixed with the measuring assembly, and the other end of the core rod is fixed with the end plug, so that the coaxiality of the core rod and the shell is ensured, the core rod deflection caused by deflection is reduced, and the measuring data is influenced; the guide groove arranged on the side surface of the end plug can ensure the smoothness of the liquid inside and outside the shell, and ensure that the liquid level in the shell can correctly reflect the liquid level of nuclear reaction cooling liquid in the reactor pressure shell.

In summary, the present application includes at least one of the following beneficial technical effects:

1. The liquid level of the nuclear reaction cooling liquid is measured without depending on an observation window or a liquid level conduit, and the whole nuclear reaction cooling liquid measuring rod is arranged in the reactor pressure shell, so that the tightness of the whole reactor core and cooling liquid is ensured, and nuclear radiation leakage is prevented;

2. The measurement result of the application is directly output as an electric signal, no manual participation is needed, the contact frequency between the staff and the reactor is reduced, and the health and safety of the staff are further protected;

3. By the arrangement of the soft film, the core rod is not in direct contact with the nuclear reaction cooling liquid, so that the influence of corrosion and radiation on the core rod is avoided, and the accuracy of measurement data is further ensured;

4. The diameter of the through hole close to one end of the soft film is larger, so that the liquid level change of the soft film end is reflected to the measuring section in an amplified manner, and the obvious liquid level change in the through hole can be realized only by small deformation;

5. The outer side of the soft film is provided with the supporting net, so that the soft film is prevented from being pressed to the outer wall of the shell by liquid after being separated, and the soft film is optionally arranged in a circular ring shape, so that interference with the core rod in the process of concave of the soft film is avoided;

6. The core rod is arranged as a resistance rod, the resistance measured by the measuring assembly is influenced by the length of the resistance rod exposed on the liquid level besides the partial pressure of the conductive liquid, when the liquid level changes, the resistance of the core rod connected in series in the circuit changes, the change trend is the same as that of the liquid resistance, when the liquid level changes, the resistance change is larger, and the measured data is more accurate;

7. the core rod is sleeved with the limit ring, the minimum gap between the core rod and the shell is determined by the limit ring under the limit water level, the electric conduction liquid resistance of the position is the lowest, and the position is closest to the measuring assembly, so that when the nuclear reaction cooling liquid reaches the upper limit liquid level, a larger proportion of the output current of the measuring assembly is shunted to the limit ring, and the resistance of the whole circuit is suddenly reduced, so that an alarm function is realized.

Drawings

FIG. 1 is a schematic cross-sectional view of a nuclear reaction coolant measuring rod according to example 1 of the present application;

Fig. 2 is an axial view of an end plug according to embodiment 1 of the present application;

FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 2;

FIG. 4 is a schematic diagram showing the use of the nuclear reaction coolant measuring rod according to example 1 of the present application;

FIG. 5 is a schematic cross-sectional view of a nuclear reaction coolant measuring rod of example 2 of the present application at a high liquid level;

FIG. 6 is a schematic cross-sectional view of a nuclear reaction coolant measuring rod of example 2 of the present application at a low liquid level.

Reference numerals illustrate:

1. a housing; 11. a through hole; 12. a soft film; 13. a supporting net; 14. a guide ring; 2. a core rod; 21. a limiting ring; 22. a corrosion-resistant end sleeve; 3. a measurement assembly; 4. an end plug; 41. a fixing groove; 42. a guide groove; 51. a fuel rod; 52. stacking; 53. a reactor pressure shell; 61. nuclear reaction cooling liquid; 62. and (5) conducting liquid.

Detailed Description

The present application will be described in further detail with reference to fig. 1-6, and it should be noted that the number of parts and the size ratio in this embodiment are all schematic and do not represent the actual apparatus configuration of the embodiment.

In order to ensure that the core of the nuclear reactor is maintained at a safe operating temperature, a depth of nuclear reaction coolant 61 is present in the reactor pressure shell 53 for soaking the core during the nuclear industry. In order to observe the liquid level of the coolant, it is necessary to provide an observation window or a liquid level conduit in the side wall of the reactor pressure shell 53. The coolant itself has strong radiation due to direct or indirect contact with the core, and the radiation protection performance of the observation window and the liquid level conduit is weaker than that of other parts of the reactor pressure shell 53, which causes harm to the health and safety of observers.

The embodiment of the application discloses a nuclear reaction cooling liquid measuring rod.

Example 1

Referring to fig. 1, a nuclear reaction coolant measuring rod includes a housing 1, a core rod 2, a measuring assembly 3, and an end plug 4. The shell 1 is a conductor cylinder with a through hole 11 along the axial direction, one end of the conductor cylinder is fixedly connected with the measuring assembly 3, and the other end of the conductor cylinder is fixedly connected with the end plug 4; the core rod 2 is suspended in a through hole 11 of the shell 1, one end of the core rod is fixedly connected with the measuring assembly 3, and the other end of the core rod is abutted with the end plug 4; the end plug 4 is made of insulating material or provided with an insulating layer on the surface, and the measuring assembly 3 is electrically connected with the shell 1 and the core rod 2 in addition to the fixing function, for measuring the resistance of the loop in which the shell 1 and the core rod 2 are located.

Specific:

The shell 1 and the through hole 11 are coaxially arranged, and an internal thread is arranged at one end of the through hole 11 close to the end plug 4 and used for fixing the end plug 4; a guide ring 14 surrounding the shell 1 is sleeved at one end of the shell 1 close to the measuring assembly 3, the guide ring 14 is made of low-resistance material, and the parts contacted with the shell 1 are all conducted; external threads are provided on the side walls of the housing 1 for removable connection with a stack 52 of a nuclear reactor.

Referring to fig. 2 and 3, the end plug 4 is a cylinder with an outer diameter corresponding to the through hole 11, an external thread matched with an internal thread of the through hole 11 is formed on the side surface of the end plug 4, an end plug through hole is formed along the axis of the end plug 4, and the diameter of the end plug through hole at one end close to the core rod 2 is increased to form a horn mouth; in addition, a plurality of guide grooves 42 are provided along the generatrix of the end plug 4, the guide grooves 42 being distributed in a circumferential array centered on the axis of the end plug 4.

In another implementation of the present embodiment, the end plug 4 is snapped into engagement with the housing 1 via a keyway.

Referring to fig. 1, the measuring assembly 3 is fixedly connected to an end of the housing 1 remote from the end plug 4, electrically connected to the guide ring 14, and insulated from other parts of the housing 1 than the guide ring 14.

It should be noted that the measuring assembly 3 has no sealing effect on the through hole 11 of the housing 1.

The mandrel 2 is coaxially disposed with the housing 1 and the through hole 11, and the mandrel 2 is not in contact with the housing 1, in other words, a gap exists between the mandrel 2 and the through hole 11; one end of the core rod 2 is fixedly connected with the measuring assembly 3 and electrically connected, and the other end of the core rod is inserted into a horn mouth of the end plug 4 and is abutted with the end plug 4; the core rod 2 is sleeved with a limiting ring 21 at a position close to the measuring assembly 3, and the gap between the limiting ring 21 and the through hole 11 is smaller than the gap between the core rod 2 and the through hole 11.

Preferably, the mandrel 2 is a resistive rod.

Referring to fig. 4, nuclear reaction coolant measuring rods are provided in combination with the same set of fuel rods 51 having the same diameter and length as the fuel rods 51, and one or more nuclear reaction coolant measuring rods are arranged in a nuclear reactor array and connected to a stack frame 52 by external threads provided on a side wall of the housing 1. The whole of the nuclear reaction cooling liquid measuring rod, the fuel rod 51 and the stack frame 52 is placed in the reactor pressure shell 53, immersed and cooled with the nuclear reaction cooling liquid 61, and the upper limit liquid level of the nuclear reaction cooling liquid 61 corresponds to the stopper ring 21 and the lower limit liquid level corresponds to the end plug 4.

It should be noted that the number of fuel rods in fig. 4 does not represent an actual arrangement, and in a preferred embodiment of this example, there are 280 fuel rods 51 and 9 nuclear reaction coolant measuring rods in the 17 x 17 nuclear reactor array.

Preferably, in the case where the stack frames 52 are provided at both ends of the nuclear reaction coolant measuring rod and the fuel rod 51, the external threads at both ends of the housing 1 are threaded in the reciprocal directions and the number of threads is the same, so that the assembly with the two stack frames 52 is completed in one rotation process.

The implementation principle of the embodiment 1 is as follows:

Referring to fig. 4, the nuclear reaction coolant measuring rod of the present application is arranged in a nuclear reactor array, immersed in a coolant together with a fuel rod 51, and enclosed by a reactor pressure shell 53. When the liquid level of the nuclear reaction cooling liquid 61 in the reactor pressure shell 53 changes, the liquid level in the through hole 11 of the shell 1 changes along with the change under the action of the communicating vessel, and the liquid level is always kept level with the outside of the shell 1.

Referring to fig. 1, the resistance measured by the measuring assembly 3 is actually composed of three parts in series, a part of the shell 1 exposed above the liquid surface, a part of the mandrel 2 exposed above the liquid surface, and a nuclear reaction cooling liquid 61 between the shell 1 below the liquid surface and the mandrel 2. For the embodiment in which the shell 1 and the core rod 2 are made of low-resistance conductors, the resistance of the first two parts is negligible, the measurement result is actually a parallel connection result of the nuclear reaction cooling liquid 61 between the core rod 2 and the shell 1 below the liquid level, the resistance is reduced along with the rising of the liquid level, the resistance is increased along with the falling of the liquid level, and the actual liquid level can be obtained only by comparing with preset table parameters and according to the resistance.

Preferably, when a resistor rod is used as the core rod 2, when the liquid level is changed, the resistance of the portion of the core rod 2 located above the liquid level is changed in addition to the above change, and is connected in series to the circuit. Specifically, when the liquid level rises, the resistance of the core rod 2 connected in series into the circuit decreases, and the total resistance decreases; when the page descends, the resistance of the core rod 2 connected in series into the circuit increases, and the total resistance increases. Because the change trend of the resistance along with the liquid level is the same as the change trend of the resistance, namely, when the mandrel 2 is a resistance rod, the same liquid level change can be reflected into larger resistance parameter change, so that higher measurement accuracy is realized.

When the nuclear reaction cooling liquid 61 in the reactor pressure shell 53 reaches the upper limit liquid level, the liquid level in the shell 1 is contacted with the limiting ring 21, the minimum gap between the core rod 2 and the shell 1 is determined by the spacing between the limiting ring 21 and the inner wall of the shell 1, and the jump of the resistance value measured by the measuring assembly 3 is reduced; when the nuclear reaction cooling liquid 61 in the reactor pressure shell 53 reaches the lower limit liquid level, no nuclear reaction cooling liquid 61 exists between the shell 1 and the core rod 2, and the voltage tends to infinity under the condition of disconnection, thereby playing a role in alarming.

Example 2

Referring to fig. 5 and 6, this embodiment is different from embodiment 1 in that:

In this embodiment, the end-less plug 4 is disposed, one end of the through hole 11 far away from the measuring component 3 is sealed by the soft film 12, a supporting net 13 is disposed on one surface of the soft film 12 far away from the measuring component 3, the diameter of the supporting net 13 is larger than that of the through hole 11, the supporting net and the casing 1 are mutually fixed, and a pressure sensor is disposed between the supporting net 13 and the casing 1.

The core rod 2 is provided with a corrosion resistant end cap 22 at the end remote from the measuring assembly 3, and the end face of the corrosion resistant end cap 22 at the end remote from the core rod 2 is flush with the end face of the housing 1 at the end remote from the measuring assembly 3.

The soft membrane 12 is preferably an elastic annular membrane, the outer circle of the annular membrane is fixed with the shell 1 in a sealing way, and the inner circle of the annular membrane is fixed with the corrosion-resistant end sleeve 22 in a sealing way.

When the liquid level of the nuclear reaction cooling liquid 61 rises, under the action of pressure difference, the soft film 12 is internally recessed into the gap between the core rod 2 and the shell 1; when the liquid level of the nuclear reaction cooling liquid 61 falls, the flexible membrane 12 approaches the supporting net 13 under the action of the pressure difference until being received by the supporting net 13.

In the cavity formed by the flexible membrane 12 and the shell 1, the electric conduction liquid 62 is filled, in the normal working state, under the action of the communicating vessel, the liquid level of the electric conduction liquid 62 in the shell 1 changes along with the change of the liquid level of the nuclear reaction cooling liquid 61 outside the shell 1, and when the nuclear reaction cooling liquid 61 reaches the upper limit liquid level, the electric conduction liquid 62 contacts with the limiting ring 21.

Preferably, the hole 11 is flared at a side close to the soft film 12, and the mandrel 2 is a cylinder with a constant diameter at a position corresponding to the flared hole.

The implementation principle of the embodiment 2 is as follows:

The side of the flexible film 12 close to the core rod 2 is contacted with the conductive liquid 62, the side of the flexible film 12 far from the core rod 2 is contacted with the nuclear reaction cooling liquid 61, and the liquid pressure is determined by the product of the contact area, the gravity acceleration, the liquid depth and the liquid density, and the gravity acceleration and the contact area are approximately equal at two sides of the flexible film 12 and the liquid density are in fixed proportion, so that when the flexible film 12 is in a stress balance state, the conductive liquid 62 in the shell 1 is in fixed proportion with the nuclear reaction cooling liquid 61 outside the shell 1 relative to the depth of the flexible film 12, and when the density of the conductive liquid 62 and the nuclear reaction cooling liquid 61 are equal, the liquid levels inside and outside the shell 1 are flush.

Referring to fig. 5, when the nuclear reaction cooling liquid 61 in the reactor pressure shell 53 reaches the upper limit level, the liquid level in the shell 1 contacts with the stop collar 21, the minimum gap between the core rod 2 and the shell 1 is determined by the spacing between the stop collar 21 and the inner wall of the shell 1, and the jump of the resistance value measured by the measuring assembly 3 is reduced.

Referring to fig. 6, when the nuclear reaction cooling liquid 61 in the reactor pressure shell 53 reaches the lower limit level, the hydraulic pressure provided by the nuclear reaction cooling liquid 61 cannot balance the hydraulic pressure brought by the electric conduction liquid 62, the balance force is provided by the supporting net 13 on the side of the flexible membrane 12 away from the core rod 2, and the reading of the pressure sensor is increased, so as to play a role of alarming.

The core rod 2 in this embodiment is isolated from the nuclear reaction cooling liquid 61, and the corrosion of the nuclear reaction cooling liquid 61 and the influence of radioactivity on the core rod 2 are avoided, so as to ensure the reliability of reading.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims (10)

1. The nuclear reaction cooling liquid measuring rod is characterized by comprising a shell (1), a core rod (2) and a measuring assembly (3), wherein a through hole (11) is formed in the shell (1) along the axis of the shell, the core rod (2) is suspended in the through hole (11), and a uniform gap exists between the side surface of the core rod (2) and the inner wall of the shell (1);

The shell (1) and the core rod (2) are fixedly connected with the measuring assembly (3) at the same end, the shell (1) and the core rod (2) are made of conductors, the nuclear reaction cooling liquid measuring rod is configured to be inserted into the nuclear reaction cooling liquid (61) from one end of the measuring assembly (3), and the measuring assembly (3) is used for measuring the resistance between the shell (1) and the connecting end of the measuring assembly (3) and between the core rod (2) and the connecting end of the measuring assembly (3).

2. Nuclear reaction coolant measuring rod according to claim 1, characterized in that the end of the housing (1) remote from the measuring assembly (3) is closed by a flexible membrane (12), the cavity formed by the flexible membrane (12) and the housing (1) is filled with an electrically conductive liquid (62), the flexible membrane (12) is deformable under pressure difference, so that the electrically conductive liquid (62) in the housing (1) is flush with the nuclear reaction coolant (61) outside the housing (1).

3. Nuclear reaction coolant measuring rod according to claim 2, characterized in that the diameter of the through hole (11) is larger at the end near the flexible membrane (12) than at the end near the measuring assembly (3).

4. Nuclear reaction coolant measuring rod according to claim 2, characterized in that the end of the flexible membrane (12) remote from the measuring assembly (3) is provided with a supporting net (13) for carrying the flexible membrane (12) and preventing the flexible membrane (12) from falling out of the through hole (11).

5. The nuclear reaction cooling liquid measuring rod according to claim 2, wherein the soft membrane (12) is in a circular ring shape, one end of the core rod (2) close to the soft membrane (12) is provided with a corrosion-resistant end sleeve (22), an outer circle of the soft membrane (12) is fixed with the shell (1) in a sealing manner, and an inner circle of the soft membrane (12) is fixed with the corrosion-resistant end sleeve (22) in a sealing manner.

6. Nuclear reaction coolant measuring rod according to claim 1, characterized in that the core rod (2) is a resistive rod of uniform conductivity.

7. The nuclear reaction cooling liquid measuring rod according to claim 1, characterized in that a limiting ring (21) is sleeved on the core rod (2), the limiting ring (21) is conductive and has a gap with the shell (1), and when the nuclear reaction cooling liquid (61) reaches an upper limit liquid level, the liquid level in the shell (1) is in contact with the limiting ring (21).

8. The nuclear reaction coolant measuring rod according to claim 1, wherein the housing (1) further comprises a guide ring (14), the guide ring (14) is disposed at one end of the housing (1) close to the measuring assembly (3), and the guide ring (14) is electrically connected to the measuring assembly (3).

9. Nuclear reaction coolant measuring rod according to claim 1, characterized in that the two ends of the housing (1) are provided with external threads.

10. The nuclear reaction cooling liquid measuring rod according to claim 1, further comprising an end plug (4), wherein the end plug (4) is in threaded connection with the through hole (11), a fixing groove (41) is formed in one end of the end plug (4) close to the core rod (2), the core rod (2) is inserted into the fixing groove (41) and is abutted to the end plug (4), a plurality of evenly distributed guide grooves (42) are formed in the side face of the end plug (4), and the guide grooves (42) penetrate through the whole end plug (4) along the axial direction of the end plug (4).