JPH0249194A - Device for preventing erroneous taking out of core constituting element of fast breeder - Google Patents

Abstract

PURPOSE:To identify a core constituting element in a short period of time by detecting the patterns of the core constituting element by an electronic scanning type ultrasonic probe of a gripper end part in the state of gripping the core constituting element by the gripper of a refueling machine. CONSTITUTION:The annular patterns 11 which are different with each of the kinds or fuel cycles of the core constituting element are inscribed to the top end face of the core constituting element 1 and the electronic scanning type ultrasonic probe 10 facing the patterns 11 is provided to the end of the gripper 2 of the refueling machine. The patterns 11 are detected by scanning the probe 10 in a radial direction when the core constituting element 1 is gripped by the gripper 2. The kind of the core constituting element is immediately identified in this way.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a core component erroneous removal prevention device that detects the type of core component of a fast reactor using an electronic scanning ultrasonic contactor and prevents the removal of the wrong type of core component during refueling.

[Conventional technology]

Control rods, nuclear fuel, blankets, etc. exist as reactor core components, and nuclear fuel is used separately for each fuel cycle. As a conventional system for preventing the mistaken removal of core components from this type of fast reactor, the entrance nozzle at the tip of the core component is modified for each type of core component. In combination with the structure of the reactor core side, the core components cannot be inserted to the correct level, and the incorrect insertion of the core components is detected based on the difference in level at this time. A device that indirectly detects that the wrong core component has been removed, or ■ A device that rotates the core component within the reactor at the time the core component is pulled out, and an identification notch that has been placed on the core component in advance. There is a known device that directly detects the type of core component (or fuel number) by detecting it with a notch lever and prevents erroneous removal. FIG. 2 is an explanatory diagram showing a device for preventing erroneous removal of core components according to the conventional example mentioned above. FIG. It is an AA cross-sectional view of (a). When the core component 1 is gripped by the gripper 2 in the hold-down tube and rotated by the core rotation element 8,
The core component 1 is provided with a notch in advance, and the notch of the core component 1 is detected by a notch lever 5, and the notch 4 is detected by a detection device 7 via a transmission shaft 6.

[Problem to be solved by the invention]

However, with the equipment described in (2) above that modifies the entrance nozzle, incorrect removal cannot be detected until after the core components have been inserted into the core using a refueling machine. If high heat generating fuel is used, the fuel temperature will exceed the limit value and there will be danger until the core components are stored. In addition, in the device (■), the number of mechanical elements that rotate the extracted core components and transmit the movement of the notch lever to the outside of the reactor is increased.
The refueling machine would be complicated, and the time required for refueling could increase because the core components would be hoisted up by the refueling machine and then rotated. This invention is capable of immediately detecting the type of core component and the fuel cycle when the core component is removed from the reactor, and prevents the erroneous removal of core components of a fast reactor without the need for a rotation mechanism for the core component. The purpose is to provide equipment.

[Means to solve the problem]

In order to achieve the above object, according to the present invention, a ring-shaped pattern that differs depending on the type of core component or fuel cycle is carved on the upper end surface of the core component of a fast reactor, and at that time, the core component is An electronic scanning ultrasonic contactor facing the pattern is provided at the gripper end of the refueling machine for loading and unloading the fuel, and the ultrasonic contactor scans in the radial direction of the core component to detect the type of the core component. This is accomplished by an anti-mistake device that prevents the removal of the wrong type of core component.

[For use]

According to this invention, a ring-shaped pattern that differs depending on the type of core component or fuel cycle is carved on the upper end surface of the core component, and an electronically scanned ultrasonic contact is provided at the gripper end of the refueling machine opposite to this pattern. is provided, and when a core component is gripped by a gripper, this contactor is scanned in the radial direction to detect the pattern, so that the type of core component can be immediately identified.

【Example】

FIG. 1 is a cross-sectional view showing the main parts of the device for preventing erroneous removal of a core component according to the present invention, in which the upper part of the core component 1 is engaged with a gripper claw 9 provided at the tip of a gripper 2 of a fuel exchanger and lifted. A ring-shaped pattern 11 that differs depending on the type of core component or fuel cycle is carved on the upper end surface of this core component 1. An electronic scanning ultrasonic contactor 10 facing the pattern 11 is provided at the end of the gripper 2, and the upper end surface of the core component 1 is radially moved from the inner diameter side to the outer diameter side with this ultrasonic contactor 10. Alternatively, the pattern 11 of the core component 1 is identified by scanning from the outer diameter side to the inner diameter side.

【Effect of the invention】

According to this invention, the pattern of the core components is detected by the electronic scanning ultrasonic contact at the end of the gripper while the core components are gripped by the gripper of the refueling machine, so the core components can be identified in a short time. . Moreover, the structure is simple, as no mechanical elements such as special notches are required to distinguish between types of core components.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the main parts of a device for preventing erroneous removal of core components according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a device for preventing erroneous removal of core components according to a conventional example, and FIG. 2 (A) is a vertical cross-section. 2(B) is a sectional view taken along the line AA in FIG. 2(A). 1: Core components, 2 Nigelipper, 10: Electronic scanning ultrasonic contactor: 11: Pattern. (stomach)

Claims (1)

[Claims] 1) A ring-shaped pattern that differs depending on the type of core component or fuel cycle is carved on the upper end surface of the core component of the fast reactor, and at that time, the gripper end of the fuel exchanger that takes the core component in and out of the reactor is carved with the ring pattern. An electronic scanning ultrasonic contactor is provided opposite to the pattern, the ultrasonic contactor is scanned in the radial direction of the core component to detect the type of the core component, and the wrong type of core component is removed. A device for preventing erroneous removal of core components of a fast reactor.