Icone15-10714 Dynamic Insertion Analysis of Control Rods of BWR Under Seismic Excitation

Nakagawa, Masaki; Koide, Yuichi; Fukushi, Naoki; Ishigaki, Hirokuni; Okumura, Kazue

doi:10.1299/jsmeicone.2007.15._icone1510_384

Cited by 2 publications

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“…This work specifically addresses the RCS dynamic behavior for Fast Reactors (FRs), although some of its content also applies to other types of reactors. This topic has long been of interest for FR development, through both experimental and numerical studies [1][2][3][4][5][6][7][8][9][10]. For FRs, a RCS is typically comprised of three main components: * A Mobile Part (MP), associated with the Control Rod (CR) that contains neutron absorbing material and its Drive Mechanism (DM).…”

Section: Introductionmentioning

confidence: 99%

Implementation and Comparison of Contact Models Within PIRAT for Nuclear Reactivity Control Systems

Bonney

Zabiego

2020

Journal of Vibration and Acoustics

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The reactivity control system is a vital safety system for a nuclear reactor. One of the most challenging aspects in the design of these systems is the operation during critical situations, in particular during earthquakes to safely shut-down the reactor. To study these situations, the toolbox python Implementation for Reliability Assessment Tools (PIRAT) is used to model two types of excitation: single frequency and realistic. The main focus of this work is the comparison of the implementation of the contact models used to describe the interaction between the subsystems. For the dynamic tool in PIRAT (dynamic Euler–Bernoulli for seismic event (DEBSE)), this is done with a two-stage linear spring or Lankarani and Nikravesh-based models. For the sine excitation, the results show four distinct response types with the maximum displacement varying between the models. Low-frequency excitation showed little variance while higher frequency excitation showed large variations. The realistic excitation, however, did not show these variations and showed nearly identical results for the contact models tested. This gives confidence in the simulations since the user selected contact model did not greatly affect the simulation results for a realistic excitation.

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Section: Introductionmentioning

confidence: 99%

Implementation and Comparison of Contact Models Within PIRAT for Nuclear Reactivity Control Systems

Bonney

Zabiego

2020

Journal of Vibration and Acoustics

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“…The insertion time of the CR during earthquakes might be longer than usual due to the resisting force. Because the dynamic behavior of CR under interaction forces is so complex, insertion tests with actual scale models and numerical analyses were carried out to evaluate the insertion time (1) (2) . Nuclear power plant has the sufficient capability of shutting down by the insertion of CR under seismic events (1) .…”

Section: Introductionmentioning

confidence: 99%

Analysis of Dynamic Insertion of Control Rod of BWR under Seismic Excitation

Koide

Nakagawa

Fukushi

et al. 2008

JPES

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The dynamic characteristics of control rod for boiling water reactor being inserted under seismic excitation were investigated using non-linear analytical models. The capability of managing the insertion of control rod is one of the most important factors affecting the safety of nuclear power plant undergoing seismic events. Predicting the behavior of control rod being inserted during earthquakes is important when designing how rod should be controlled during seismic events. We developed analytical models using the finite element method (FEM). The effect of the interaction force between the control rod and the fuel assemblies is considered in non-linear analysis. This interaction force causes resistance force to be applied to the control rod when they are being inserted. The validity of the analytical models was confirmed by comparing the analytical results with the experimental ones. The effects of input seismic motion and structural parameters on the insertion time ware investigated using the analytical models. These analytical methods can be used to predict the time to insert the control rod into the core region of reactor, and are useful for designing control rod system that can survive seismic events.

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Icone15-10714 Dynamic Insertion Analysis of Control Rods of BWR Under Seismic Excitation

Cited by 2 publications

References 0 publications

Implementation and Comparison of Contact Models Within PIRAT for Nuclear Reactivity Control Systems

Implementation and Comparison of Contact Models Within PIRAT for Nuclear Reactivity Control Systems

Analysis of Dynamic Insertion of Control Rod of BWR under Seismic Excitation

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