RU209112U1 - The body of the radiation-protective inert chamber - Google Patents

Abstract

The utility model relates to the field of nuclear energy, namely to radiation-protective technology and solves the problem of creating a body of a radiation-protective chamber with a high-purity inert atmosphere. The body of the radiation-protective inert chamber contains a frame, outer and inner skins fixed on the frame to form a sealed interwall space. The sealed inter-wall space is filled with an inert gas at an excess pressure relative to the external environment. The utility model makes it possible to exclude contamination of the inert atmosphere of the working volume of the chamber, as well as the leakage of radioactive substances into the external environment. f-ly, 1 ill.

Description

The utility model relates to the field of nuclear energy, namely, to radiation-protective technology and solves the problem of creating a body of a radiation-protective chamber with a high-purity inert atmosphere for working with open sources of ionizing radiation according to OSPORB 99/2010.

Known reinforced concrete containment of nuclear power plants, which is covered with a gas-tight sealed steel lining. The cladding is fixed to the reinforced concrete containment using anchors. During the construction of the cladding, the tightness of the welds is monitored (Khaidukov G.K. et al. Reinforced concrete protective shells of nuclear power plants. M .: Atomizdat, 1978, p. 24). There is an unsealed cavity between the shells, which is ventilated in case of radiation leakage (ibid., p. 53).

The disadvantage of this shell is the possibility of radioactive substances getting into the cavity between the shells in case of violation of the tightness of the steel lining.

Known module of biological protection, designed to protect personnel from ionizing radiation. [RU 66841, 04/13/2007]. The module is a double-walled mobile element of a collapsible design. The gap formed by the inner and outer walls contains lead shot with a diameter of 3-4 mm, which absorbs ionizing radiation.

The disadvantage of the device is its leakage, which does not allow to maintain an inert environment in the working volume of the shelter.

Known protective shell, including a cavity formed between two enclosing structures [RU 82917, 09.09.2008]. The cavity is formed from blocks, each of which is made of two sheets interconnected by means of spacer bushings, fasteners, clamping bars and sealing elements. The pressure in the cavity is maintained below atmospheric by 200-400 Pa. The protective shell is designed to store harmful substances and, if they enter the cavity through the internal enclosing structure, prevents further spread. Harmful substances cannot vanish into the environment, since air cannot move from an area of low pressure to an area of high pressure. Low pressure in the cavity is created by a filter fan. The filter is used to trap harmful substances from the air flow pumped out of the cavity by the fan. The disadvantage of the device is the possibility of the spread of harmful substances from the working volume of the shell into the cavity between the walls, due to the presence of reduced pressure in the cavity between the walls of the protective shell.

The technical problem is to exclude the release of radioactive substances from the inert chamber while maintaining high purity by the inert atmosphere.

The technical result of the claimed utility model is a body of a radiation-protective inert chamber, which excludes pollution of the inert atmosphere of the working volume of the chamber, as well as leakage of radioactive substances into the external environment.

The technical result is achieved by the fact that the body of the radiation-protective inert chamber contains a frame, outer and inner skins fixed on the frame to form a sealed inter-wall space, characterized in that the sealed inter-wall space is filled with an inert gas with excess pressure relative to the external environment.

The framework represents a welded frame from steel shaped hire. The inner and outer skin, with which the frame is lined, is made mainly of corrosion-resistant steel sheets.

The presence of an inert gas in the sealed interwall space excludes the ingress of oxygen and water vapor into the working volume of the chamber, which ensures the maintenance of an inert atmosphere of high purity in the working volume of the chamber. The composition of the inert gas is similar to the composition of the working atmosphere inside the chamber.

The presence in the hermetic space between the walls of the excess pressure of the inert gas relative to the external environment eliminates the leakage of radioactive substances from the working volume of the chamber. Also, the presence of excess pressure relative to the external environment prevents air from entering the interwall space.

The pressure of the inert gas in the working volume of the chamber according to the requirements of OSPORB 99/2010 is set to 200-400 Pa below atmospheric. The excess pressure in the sealed interwall space is selected from the range of 200-400 Pa above atmospheric.

When the pressure value in the sealed inter-wall space is less than 200 Pa above atmospheric, a sufficient pressure drop is not created between the inter-wall space and the environment. At values greater than 400 Pa above atmospheric, there is a risk of damage to the skin.

Thus, a space of increased pressure of inert gas is created between the working volume of the inert chamber and the external environment, which simultaneously prevents contamination of the inert atmosphere of the working volume of the chamber and the leakage of radioactive substances into the external environment.

A new essential feature is the presence of excess pressure of an inert gas in the sealed inter-wall space of the chamber housing relative to the external environment. This allows us to conclude that the proposed solution has a novelty.

The drawing (Fig. 1) shows a cross section of the device.

The device contains: inner lining (1), frame (2), outer lining (3).

The device works as follows.

At the beginning of the operation of the chamber, the sealed interwall space is purged with an inert gas similar to the gas of the working atmosphere in the chamber, and an excess pressure of 200-400 Pa above atmospheric pressure is created. Purging continues until the concentration of controlled impurities (usually oxygen and water) decreases to the required level, for example, 200 ppm. After that, a pressure of 200-400 Pa below atmospheric pressure is created in the working volume of the chamber, and a working inert environment is created.

Claims (2)

1. A body of a radiation-protective inert chamber, containing a frame, outer and inner skins, fixed on the frame to form a sealed inter-wall space, and the sealed inter-wall space is filled with an inert gas with excess pressure relative to the external environment. 2. The body of the radiation-protective inert chamber according to claim 1, characterized in that the excess pressure in the sealed inter-wall space is selected from the range of 200-400 Pa above atmospheric.

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