Simulation of Two Types of the Control Assembly Drop in the VVER 1000 Nuclear Reactor at Seismic Event

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47718684%3A_____%2F18%3AN0000026" target="_blank" >RIV/47718684:_____/18:N0000026 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Simulation of Two Types of the Control Assembly Drop in the VVER 1000 Nuclear Reactor at Seismic Event

Original language description

A modular spatial multibody model of the LKP-M/3 control assembly of the VVER 1000 nuclear reactor was created in the alaska simulation tool. The model is intended for the simulations of the rod control cluster assembly drop. The multibody model includes the influences of fluid, the contacts and impacts of the rod control cluster assembly with the adjacent structural parts inside the reactor, deformations of fuel assembly guide tubes and a seismic excitation. The significant computed quantity is a total time of the drop. After the drop of the rod control cluster assembly to the lower part of the core a nuclear reaction stops. Due to the simulation of the least favourable situation for the rod control cluster assembly drop time in the multibody model initial position of the rod control cluster assembly is selected in the position of the maximum operation stroke. Simulations, the goal of which was to determine the rod control cluster assembly drop time at considering two types of fuel assemblies: VVANTAGE-6 and TVSA-T (in the Temelín Nuclear Power Plant, Czech Republic), were performed with the multibody model of the LKP-M/3 control assembly. Design of the LKP-M/3 control assembly (slightly) differs for the two types of the fuel assemblies. The control cluster assembly drop was simulated without any excitation and at a seismic event. The design of the LKP-M/3 control assembly of the VVER 1000 nuclear reactor should meet the condition that the drop time should not exceed 4 seconds. This value is required for the time of the rod control cluster assembly drop from its initial position to the lower limit switch considering a safety stop of the nuclear reaction. On the basis of the simulation results it could be stated that the design of the LKP-M/3 control assembly for both the VVANTAGE-6 and the TVSA-T fuel assemblies fulfils requirements for the time of the rod control cluster assembly drop at deformations of fuel assembly guide tubes and in addition in the case of a seismic event, too (in the Temelín Nuclear Power Plant). In: Abstract Book of The 9th Asian Conference on Multibody System Dynamics ACMD 2018, Shanghai Jiao Tong University, Xi'an (China), pp. 114-115, August 2018.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20302 - Applied mechanics

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů