SU534996A1 - Upper unit of nuclear reactor,mainly of fast-neutron reactor - Google Patents

Abstract

NUCLEAR REACTOR UNIT HIGH MAINLY FOR FAST NEYT-- RONAH comprising a housing having arranged inside longitudinally peremeschaemshi guide tubes for regulators u krlshku with actuators regulators conductive state of the actuator housing, and the rod movement mechanism samotormoz-adhesive device, the otlichaTyuschiys that, in order to simplify its design, each of the guide tubes is provided with an abutment and retainer and installed in the lower part of the drive body of the regulator with the possibility of axial movement when overloaded and fixation during reactor operation, the retainer is formed as a double-armed lever at the ends with rollers cooperating with the annular groove formed in the bottom of the actuator housing, and the rod is provided with a stop cooperating with a stop in the guide tube.

Description

Od 4

  ABOUT

The invention relates to nuclear technology and can be used in large industrial dB: nuclear reactors for nuclear power plants, where fuel is reloaded without decompression of the housing and the actor.

A nuclear reactor is known in which fuel refueling takes place without decompaction of the reactor vessel 1.

This reactor has actuators of regulating bodies located on the reactor lid, which move regulators in the core during reactor operation.

Since the active zone is significantly distant from the actuator housing, in order to direct the movement of regulators, each actuator of the regulator has a guide that is attached to a horizontal pivot arm that can be rotated 180 °. Inside the guide tube there is holding the rod and held in position with the help of an electromagnet,

The disadvantage of the described construction is that it cannot ensure the continuity of the channel and reliable movement of the regulator. In addition, an additional device for transmitting motion from the drive motors is required to rotate each guide tube.

Also known is an upper unit of a nuclear reactor, mainly on fast neutrons, containing a housing with longitudinally movable guide tubes for regulating organs inside it and a lid with regulators acting on it consisting of a housing, a rod and a movement mechanism from the ca. Shchims motor brake device 2J.

The disadvantage of this block is the complex c6 structure. ;

In order to simplify the construction of the unit, each of the guide tubes is provided with an abutment and a fixator, and is installed in the lower part of the drive housing of the regulator with the possibility of axial movement during overload and fixation during the operation of the reactor. The latch is made in the form of a two-armed lever with rollers at the ends, interacting with an annular groove made in the lower part of the drive housing, and the bar is equipped with a stop interacting with the stop in the right direction pipe ;.

In (lig.1, the proposed upper unit of the nuclear reactor is shown, general view; in FIG. 2, section LL in FIG. 1} in FIG. 3 — section one by one

from regulatory actuators; on / figure 4 - view along arrow B.

The upper unit of the nuclear reactor has a lid on which a large rotary plug 1 and a small rotary stopper 2 with a central column 3 are located. In the column there are mounted drives 4 of regulating bodies that move regulators 5 in the core 6

0 reactor. The direction of movement of the regulating bodies is provided by guide tubes 7, which, when the reactor is operating, are mounted on the upper ends of the sleeves 8 and form a single channel with them for moving the regulating bodies 5. The sleeves are fixed in the reactor core. Itanta 9 of the actuator 4 of the regulator, at the lower end, has a gripper device 10, by means of which the actuator engages with the head of the regulator 5. There is a groove 11 and v an emphasis 12 on the rod 9.

5 Each of the guide tubes 7 is installed in the lower part of the body with water 4 regulators and has an integrated stop 13 and two shoulders levers 14 with rollers 15 and 16 at the ends; Two-armed levers 14 can rotate on axles 17 in the grooves 18 of the guide tubes 7. In the lower part of the housing 19 of the regulator's actuator 4, there is a groove 20 for the rollers and the slots 14 corresponding to the levers 14.

In the mechanism for moving the rod 9 there is a self-braking link 22, made, for example, in the form of a worm gear, installed in the kinematic chain from the electric motor 23 to the rod 9, designed to prevent the spontaneous movement of the rod under the weight. moving parts.

5 The downward movement of the guide tube 7 is limited by the stop 24 moving along the groove 21, the upward movement is limited by the inductive limit switch 25.

When the reactor is in operation, the guide tubes 7 are in the lower position — they are mounted on the sleeve-8. In this case, the stop 24 is located at the end of the groove 21; The upper rollers 15 of the levers 14 go into the annular groove 20 of the lower part of the housing 19 of the actuator 4 of the regulator, and the lower rollers 16 of the levers roll along the moving rod 9. The rod can move freely within the working stroke of the regulator 5. The guide tube 7 Zafi: on the housing 19 rollers of the levers 14, located in the groove 20. To accomplish the fuel overload, the guide tubes 7 lift-i

with up position. Three of this, the rod 9 disengages from the regulating 5 and moves to the upper operating position, in which the stop 12 on the rod 9 approaches the stop 13 on the guide tube 7, and the groove 11 is installed opposite the lower roller 16 of the lever 14.

Upon further raising of the rod 9 through the stops 12 and 13, the guide tube 7 is raised, the upper rollers 15 of the lever 14 exit from the groove 20 of the housing 19, and the bottom roll: face 16 enters the groove 11 of the rod 9. When the guide tube reaches 7 in the upper position, the end inductive switch 25 shuts off the electric motor and stops the rod 9 with the guide tube 7.

Due to the presence of a self-brake of the link 22, the guide tube 7 hangs on the rod 9 when the fuel is loaded from the reactor core.

After the termination of the overload, the rod 9 is lowered. The guide tube 7 under the action of its own weight moves with the rod until the stop 24 reaches the end of the groove 21. If the free movement of the pipe is prevented by sticking, then the rod 9 moves - the guide tube 7 forcefully pulls it by groove 11 and

0 double-arm levers 14, which can not get out of engagement with the rod 9, until the upper rollers 15 stand against the groove 20 on the lower part of the body 19. When the guide

5 the pipe 7 will return to the lower position and will be installed on the rail 8 / the stop 24 will reach the end of the groove 21, the upper rollers 15 will go into the groove 20 of the housing 19, and the lower role 16 will come out of the groove 11 and release the bar 9, which will move downwards, wherein the guide tube 7 is fixed relative to ftoppus 19 by means of ricags 14.

Claims (1)

UPPER NUCLEAR REACTOR UNIT FOR FAST NEUTRONS, comprising a housing with longitudinally movable guide tubes for regulatory bodies located inside and a cover with actuators of regulatory bodies consisting of a drive housing, a rod and a movement mechanism with a self-braking device, characterized in that in order to simplify its designs, each of the guide tubes is equipped with a stop and a clamp and is installed in the lower part of the drive body of the regulatory body with the possibility of axial movement When handling and fixation during reactor operation, the retainer is formed as a double-armed lever at the ends with rollers cooperating with the annular groove formed in the bottom of the actuator housing, and the rod is provided with a stop cooperating with a stop in the guide tube. SP ss <&