An underwater measuring device and method for measuring deformation of a nuclear fuel assembly

By employing contact measurement devices and modular design, the accuracy and efficiency issues of nuclear fuel assembly deformation measurement in high-radioactivity environments have been resolved, achieving high-precision and low-cost nuclear fuel assembly deformation measurement.

CN120800150BActive Publication Date: 2026-08-18BEIJING RAYMOND CBE MECHANICAL & ELECTRIC TECH
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Patent Information

Application Number
CN202511105834.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-08-07
Publication Date
2026-08-18
Estimated Expiration
2045-08-07

AI Technical Summary

Technical Problem

Existing technologies for measuring the deformation of nuclear fuel assemblies in highly radioactive environments suffer from several problems, including insufficient underwater light, the influence of temperature field and turbulence on measurement accuracy, difficulty in achieving measurements under different stress states, maintenance difficulties, complex measurement mechanisms, high costs, and low efficiency.

Method used

The device employs a contact measurement system, including a frame, clamping components, support components, and multiple measuring components. It achieves synchronous measurement across multiple cross sections and directions via a water-based drive mechanism and control box. Combined with a host computer, it performs data processing and reconstructs a three-dimensional deformation model. The device utilizes modular design and surface contact measurement to overcome the influence of environmental factors.

Benefits of technology

It effectively avoids interference from underwater environmental factors, improves measurement accuracy and efficiency, reduces maintenance difficulty and cost, simplifies the structure, facilitates maintenance, and possesses high reliability and market competitiveness.

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Abstract

The application discloses a device and a method for measuring deformation of a nuclear fuel assembly underwater. The device comprises an underwater measuring mechanism, a water surface driving mechanism, a control box and an upper computer. The underwater measuring mechanism comprises a rack, clamping components, supporting components and a plurality of measuring components. The rack comprises a plurality of layers of supports provided with through holes or through grooves. The supporting components are arranged at the bottom of the rack and have a supporting position and a retracted position relative to the rack. The clamping components are arranged at the upper part of the rack and have a clamping position and a releasing position relative to the rack. The plurality of measuring components are arranged on corresponding supports along the height direction of the nuclear fuel assembly to be measured. The water surface driving mechanism is connected with the underwater measuring mechanism. The control box is connected with the water surface driving mechanism and the underwater measuring mechanism. The upper computer is used for verifying deformation data of the nuclear fuel assembly to be measured through a redundancy algorithm, data fitting and three-dimensional deformation model reconstruction, obtaining and displaying the deformation amount of the nuclear fuel assembly to be measured. The application further provides a method for measuring deformation of a nuclear fuel assembly underwater.
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