Study of Control Rod Device Mechanism Missile Impact on Protection Plate
- Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, Sichuan, 610041 (China)
The flying of missile will severely jeopardize the structural integrity in control rod ejection accident. In order to analyze the strength of a new type of shield plate under control rod drive mechanism (CRDM) impact, this article develops the simulation model and conducts the nonlinear response analysis of the missile under 4 cases. In addition, the stress analysis and evaluation of protection shield plate at the most dangerous case are performed. The computed results are validated via empirical formula. The motion analysis of CRDM missile indicates that the fracture at trapezoid thread place is more dangerous than the fracture occurs at cold fitting place. Moreover, the impact at the rim of the shield by the CRDM rod travelling housing is more dangerous than at the center. Therefore, the fracture at trapezoid thread place as well as the shield plate rim under impact should be examined when performing the stress evaluation of the shield plate. Under this circumstance, the maximum stress intensity of the shield plate will exceed the yielding stress and thereby local plasticity will occur. Strain analysis shows that compared with the extension ratio at structural failure, the computed strain still has quite amount of margin to ensure the shield plate will not be penetrated. Hence, this new type of the protection shield plate is capable to prevent the damage of other components by the flying of CRDM missile.
- OSTI ID:
- 23050244
- Journal Information:
- Transactions of the American Nuclear Society, Journal Name: Transactions of the American Nuclear Society Vol. 116; ISSN 0003-018X
- Country of Publication:
- United States
- Language:
- English
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