Methodology for a numerical simulation of an insertion or a drop of the rod cluster control assembly in a PWR

Andriambololona, H.; Bosselut, D.; Massin, Patrick

doi:10.1016/j.nucengdes.2006.09.001

Cited by 20 publications

(2 citation statements)

References 8 publications

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“…In the past, the buffering method of the control rod assembly mainly used the reduced diameter section at the bottom of the rod bundle and supplemented the reverse resistance provided by the top spring to complete the rod drop buffer (Rabiee and Alireza, 2016;Xiao et al, 2017a;Xiao et al, 2017b). However, the machining of the reduced diameter section of the guide tube is difficult, and it is easy to cause rod wear or stickingamong droppingbehavior (Fu and Pu, 1997;Andriambololona et al, 2007;Zhang, 2017).…”

Section: Introductionmentioning

confidence: 99%

Experimental Analysis and Performance Evaluation of Spider Hydraulic Buffer for Rod Dropping in Reactor

et al. 2022

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Control rod drop is one of the key measures for the safe shutdown of the reactor. The two important evaluation indicators of the drop process are the drop time-length and the maximum impact force. By theoretical and experimental methods, this paper analyzes the influencing factors and evaluates the performance of a new type of spider hydraulic buffer with compact structure and ingenious design, which couples mechanical force and fluid resistance. First, through experiments, it is found that the real-time curve of the maximum impact force often has a bimodal structure. And the double peaks vary with the change of the internal structure of the hydraulic buffer. Secondly, since there are many variables about the structure (aperture, position, quantity, piston stroke et al.), in order to consider their influence on the maximum impact force, an equivalent ongoing flow area of the drain holes is introduced. It suggested that when the flow area of the working holes which can be covered by the stroke is close to the flow area of the remaining holes, the impact force tends to appear a minimum value. A relationship between the maximum impact force and the structure is proposed accordingly. Finally, this paper proposes a quantitative evaluation method for comprehensive buffering performance, in which the comprehensive performance evaluation factor η (0<η < 1) takes into account both the maximum impact force and the drop time. The smaller the maximum impact force and the rod drop time-length, the closer the evaluation factor η is to 1, indicating that the buffering performance is better. The research in this paper will not only help to further understand the mechanism of the drop rod buffering process, but also contribute to the structural optimization of the subsequent spider hydraulic buffer.

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Section: Introductionmentioning

confidence: 99%

Experimental Analysis and Performance Evaluation of Spider Hydraulic Buffer for Rod Dropping in Reactor

et al. 2022

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“…The mechanism of control rod drop behavior is proposed based on a non-linear differential equation to study the effects of isolated parameters on scram time [2]. A more detailed numerical simulation method [3] is proposed to describe the insertion or drop of the rod cluster control assembly. A review is presented on anomalies and conditions of increase in drag force slowing down the RDT with many kinetic measurement data [4].…”

Section: Introductionmentioning

confidence: 99%

Multi-resolution analysis for determining control rod drop time

Shin

Park

2014

Journal of Nuclear Science and Technology

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This study describes a multi-resolution analysis (MRA) to determine the onset and end drop times of control rods. The measurement test of the drop times of control rods is normally performed during the start-up test of each reactor cycle since it is a crucial safety function to guarantee the reactor safe shutdown. The MRA with wavelet transform is particularly useful in analyzing the onset transients of rod drop as a means of capturing the unique attributes of such signals in an efficient way. This approach also allows the automated determination of rod drop time which reduces the uncertainty induced by ad hoc heuristic approaches. The test signal is generated by adding the random noise measured from real rod drop tests subtracting the wavelet-filtered noise free signal from the noisy signal leaving the noise. The signal is similar to both high sharp spikes noise and sine wave noise from the real voltage trace generated during the rod drop test. The effectiveness of the method is demonstrated by the MRA process.

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Nonlinear dynamics of flexible slender structures moving in a limited space with application in nuclear reactors

2021

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Methodology for a numerical simulation of an insertion or a drop of the rod cluster control assembly in a PWR

Cited by 20 publications

References 8 publications

Experimental Analysis and Performance Evaluation of Spider Hydraulic Buffer for Rod Dropping in Reactor

Experimental Analysis and Performance Evaluation of Spider Hydraulic Buffer for Rod Dropping in Reactor

Multi-resolution analysis for determining control rod drop time

Nonlinear dynamics of flexible slender structures moving in a limited space with application in nuclear reactors

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