Modified electromagnetic control rod driving mechanism for ship reactor

Abstract

The invention discloses a modified electromagnetic control rod driving mechanism for a ship reactor. The modified electromagnetic control rod driving mechanism comprises a pressure withstand housing component, an auxiliary rod dropping component, a rod position detector component, a claw component, a driving rod component and a coil component. The coil component sleeves the pressure withstand housing component and comprises four electromagnetic coils and a yoke; the four electromagnetic coils include a locking coil, a lifting coil, a moving coil and a fixed coil from top to bottom; the claw component is provided with core components corresponding to the coils; the core components include a locking core component, a lifting core component, a moving core component and a fixed core componentfrom top to bottom; the locked core component includes a locking armature and a locking claw; the locking coil and the locking core form a locking electromagnet acting as a locking system to a drivingrod; when the locking coil is powered off, the locking claw is closed; electromagnetic force generated by the electrified locking coil enables the locking armature to provide downward attraction, andthe locking claw is opened.

Description

technical field [0001] The invention belongs to the field of marine reactors, and more specifically relates to an improved electromagnetic control rod driving mechanism for marine reactors. Background technique [0002] The Control Rod Drive Mechanism (CRDM for short) is the action actuator of the important control system and safety protection system of the reactor. Normal or accident shutdown. [0003] The step-by-step magnetic lifting CRDM commonly used in the existing land-based PWR nuclear power plants is usually composed of a pressure-resistant shell part, a coil part, a drive rod part, a hook part and a rod position detector part. The pressure vessel part is installed on the top of the reactor pressure vessel, and inside is a sealed high-temperature and high-pressure primary circuit coolant. A coil component is installed around the pressure-resistant shell component, and has three electromagnetic coils and a yoke assembly, which are lifting coils, moving coils and fi...

AI Technical Summary

Problems solved by technology

[0004] However, this mechanism cannot be directly used in ship reactors, because the reactor is always in a rocking state when the ship is sailing. At this time, the CRDM cannot always maintain a fixed vertical state, and it is no longer possible to rely solely on gravity as the driving force for the control rods to be inserted into the core. Safely implement the drop action

When the ship reactor tilts at a large angle or even capsizes, gravity becomes the resistance to the movement of the control rods to the active area of ​​the core, and the shutdown of the reactor cannot be achieved by only relying on gravity

And when the ship reactor capsizes and loses power at the same time, the drive rod will be thrown out from the active area of ​​the core, leading to the introduction of positive reactivity, which cannot guarantee nuclear safety

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