RU203654U1 - DEVICE FOR REGISTRATION OF NUCLEAR RADIATIONS - Google Patents

Abstract

The utility model relates to a device for monitoring research nuclear reactors (RNR), in which the density of the flux of thermal neutrons and the flux of gamma quanta are converted into output electrical signals at all modes of operation of the RNR. The device contains a sealed housing, which allows placement in the area of intense gamma and neutron ionizing radiation and is filled with an inert gas. An ionization chamber is located in the housing, the output electrodes of the ionization chamber are connected to the electrical outlet of the unit, consisting of a sealed cable gland and a sealed cable, which provides transmission of electrical signals from the ionization chamber through the cable to the communication line to the device for their registration. The sealed body is made up of a cylindrical part and a pair of covers that cover it, in one of which the aforementioned unit is fixed, the covers of the sealed body are removable, the ionization chamber is fixed in the sealed case, a damping element is used as a fixing element, the ionization chamber is electrically isolated from sealed housing. The ionization chamber can also be fixed in a sealed housing using a damping element - a spring. The technical result is the maintainability of the device while ensuring the reliability of electrical connections. 1 h. p. f-ly, 2 ill.

Description

The utility model relates to electrical engineering, in particular, to control devices for research nuclear reactors (RNR), in which the thermal neutron flux density (TPN) and gamma-ray flux are converted into output electrical signals at all RNR operating modes.

The proposed version of the device for recording nuclear radiation refers to nuclear technology and can be used when launching an INR to control the power according to the PPTP, when changing the power of an INR in the control and protection systems (CPS) of an INR, during an overload of the core, as well as to determine the parameters of nuclear fields. radiation.

Known suspensions of the ionization chamber (PIK) (in fact, devices for recording nuclear radiation), protecting the ionization chambers (IR) and the electrical communication line (cables, wires) from aggressive environmental influences in the channel of a nuclear reactor designed to accommodate the PIK and located along INR core (see Scientific and technical foundations of nuclear energy / Ed. by K. Goodman. - M .: Foreign literature, 1948, p. 231).

Known device for measuring PPTN, including a source of fast neutrons (IBN). container for safe storage of the IBN, a channel for moving the IBN between the container and the ionization chamber, a removable mechanism for moving the IBN. The control of the conversion coefficient is carried out during the period of shutdown of the reactor operation, while the IBN is installed near the ionization chamber, by comparing the signal value from the IBN with the passport data obtained during the manufacture of the PIK from the same UPS. During the operation of the nuclear reactor, the UPS is in the PIK safe storage container (see RF patent No. 2549177, published on 20.04.2015). The device according to RF patent No. 2549177 is analogous in design to the proposed device for recording nuclear radiation.

The disadvantage of the considered devices is the complexity of the design and large dimensions, which is an inconvenience when using them at the INR.

A device for recording nuclear radiation is known (see RF patent No. 2227342, published on 20.04.2004) (prototype), which is a flexible hermetically sealed structure consisting of a submerged part installed in a channel of a reactor installation and a line of electrical communications for connection to a processing unit signals from ionization chambers. The immersion part consists of several ionization chambers located in sealed housings and interconnected by flexible sealed metal sleeves. The ionization chambers are connected to the line of electrical communications using a high-temperature noise-suppressing cable located in the sealed cavity of the device, while cable outlets from each chamber are laid through their axial channels. The submerged part of the device is fixed in the channel of the reactor plant by means of a rotary flange, for example, by means of a bolted connection. That is, briefly, a sealed housing that can be placed in an area of intense gamma and neutron ionizing radiation is filled with an inert gas. An ionization chamber is located in the housing, the output electrodes of the ionization chamber are connected to the electrical outlet of the unit, which provides transmission of electrical signals from the ionization chamber via a cable to the communication line to the device for recording them, while the unit consists of a sealed cable gland and a sealed cable.

The disadvantage of the device is the inconvenience of operation (the possibility of a single use in the experiment with the need to replace the entire device as a whole if any of its components fails) and the unreliability of electrical connections due to the lack of fixation and electrical protection of the ionization chamber.

The task to which the claimed invention is directed is to improve the operational convenience in using the device during the operation of the RNR, including during the period when the RNR is stopped.

The technical result consists in the maintainability of the device while ensuring the reliability of electrical connections.

The technical result is achieved due to the fact that, in contrast to the known device for recording nuclear radiation, containing a sealed housing that allows placement in the zone of intense gamma and neutron ionizing radiation and filled with an inert gas, an ionization chamber is located in the housing, the output electrodes of the ionization chamber are connected to electrical outlet of the unit, consisting of a sealed cable gland and a sealed cable, providing transmission through the cable of electrical signals from the ionization chamber to the communication line to the device for their registration, in the proposed device the sealed body is made up of a cylindrical part and a pair of covers that cover it, in one of which the above-mentioned unit is fixed, the covers of the sealed housing are installed with the possibility of their removal. the ionization chamber is fixed in a sealed case, a damping element is used as a fixing element, the ionization chamber is electrically isolated from the sealed case.

In addition, in the claimed device, the ionization chamber can be fixed in a sealed housing using a damping element - a spring.

The design of the sealed body is detachable, which makes it possible to easily replace any of its components, if necessary. For example, opening the lid with a built-in unit (the ability to remove the lid), consisting of a sealed cable gland and a sealed cable, which serves to transfer electrical signals from the ionization chamber through the cable to the communication line to the device for their registration, will allow the ionization chamber to be removed from the body, which will make it possible its simple replacement in the event of a breakdown or replacement due to the research program, while maintaining the functionality of the rest of the structure. At the same time, taking into account the provision of the claimed way of fixing the ionization chamber with the help of a damping element, it will make it possible to set a stable position of the chamber, and if it is electrically isolated from the body, it will also exclude the possibility of electrical breakdown. Thus, the adopted design solutions will improve the maintainability of the structure while increasing its reliability.

FIG. 1 shows a device for recording nuclear radiation, where 1 is a unit that transfers electrical signals from the ionization chamber through a cable to the communication line to a device for their registration, consisting of a sealed cable gland and a sealed cable, 11 is an electrical outlet of the unit, 2 and 8 are removable lids covering the body, the above-mentioned unit is fixed in the lid 2, 3 - a spring as a damping element, 4 - a sealed body, 5 and 9 - bushings that provide electrical isolation of the ionization chamber, 6 - an ionization chamber, 10 - output electrodes of the ionization chamber, 7 - seal.

FIG. 2 shows the design of a unit that provides transmission through a cable of electrical signals from the ionization chamber to the communication line to a device for their registration, where 12 is a sealed cable gland, 13 is a sealed cable.

The following design (see Fig. 1) of the suspension of the fission chamber implements the proposed utility model of a device for recording nuclear radiation from a research nuclear reactor. Ionization chamber of division 6 (KNK15 OD0.339.436TU) with output electrodes 10 is placed in a sealed case 4. To ensure electrical insulation of the chamber and the suspension housing, bushings 5 and 9 of dielectric material polyethylene 153 GOST 16337-77 are installed. The sealed casing is a composite, the cylindrical part of the casing is closed on both sides by removable covers 2 and 8, the covers are fastened to the sealed casing by a M68 × 1 threaded connection. To connect the ionization chamber with the recording equipment (recording device for electrical signals), cover 2 is provided with a mount for node 1. Node 1 consists of a sealed cable gland PG21 12 and a sealed cable Cable KAGE-HF 3 1.0 TU 16.K71-317-2002 13. The output electrodes of the ionization chamber 10 are connected to the electrical outlet of the unit 11. The chamber 6 is fixed by a spring (damping element) 3. The tightness of the fission chamber suspension is ensured by installing seals 7. The fission chamber suspension is assembled in an inert gas environment, thus, after assembly, the required the operating conditions of the ionization chamber are met. The suspension of the fission chamber is placed on a detector stand. The rack is installed at the required distance from the reactor core.

As a result, the structure is maintainable with reliable electrical connections. With the help of such a design, without its major replacement, the possibility of repeated experiments on the registration of nuclear radiation is realized.

Claims (2)

1. A device for recording nuclear radiation, containing a sealed housing, allowing placement in the zone of intense gamma and neutron ionizing radiation and filled with an inert gas, an ionization chamber is located in the housing, the output electrodes of the ionization chamber are connected to the electrical outlet of the assembly, consisting of a sealed cable gland and of a sealed cable, providing transmission through the cable of electrical signals from the ionization chamber to the communication line to the device for their registration, characterized in that the sealed housing is made up of a cylindrical part and a pair of covers that cover it, in one of which the above-mentioned unit is fixed, the covers of the sealed housing are installed with the possibility of their removal, the ionization chamber is fixed in a sealed case, a damping element is used as a fixing element, the ionization chamber is electrically isolated from the sealed case. 2. The device according to claim 1, characterized in that the ionization chamber is fixed in a sealed housing by means of a damping element - a spring.

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