Abstract
The key-groove couplings between the lower part of core barrel and reactor pressure vessel in the nuclear VVER-type reactor show assembly side clearances. Vibration of reactor components, caused by coolant pressure pulsations generated by main circulation pumps, produces impulse and friction contact forces in the above mentioned couplings. These forces are used for calculation of power and work of friction forces in the slipping contact surfaces between the key and the groove of the particular couplings and for their fretting wear prediction in dependence on the clearance values. The paper presents an original approach to mathematical modelling and simulation analysis of reactor nonlinear vibrations respecting friction-vibration interactions at all the key-groove couplings with clearances. The method is applied to VVER 1000/320 type reactor operated in the nuclear power plant Temelin in the Czech Republic.
Highlights
The existence of clearances in the key-groove couplings between the lower part of core barrel and the reactor pressure vessel in the nuclear VVER-type reactors [12, 13] is necessary and unavoidable, because of manufacturing and assembly tolerances of the reactor components
The aim of this paper is the investigation of reactor nonlinear vibration respecting the assembling side clearances and friction in eight key-groove couplings (Fig. 3) uniformly deployed to circumference between the lower part of Core barrel (CB) (CB3) and Pressure vessel (PV) in the nuclear VVER1000/320 type reactor operated in nuclear power plant (NPP) Temelın in the Czech Republic
The main objective of the paper is to present the new basic method for estimation of impact and friction forces transmitted by K-G couplings between the lower part of CB and the reactor PV
Summary
The existence of clearances in the key-groove couplings between the lower part of core barrel and the reactor pressure vessel in the nuclear VVER-type reactors [12, 13] is necessary and unavoidable, because of manufacturing and assembly tolerances of the reactor components. The aim of this paper is the investigation of reactor nonlinear vibration respecting the assembling side clearances and friction in eight key-groove couplings (Fig. 3) uniformly deployed to circumference between the lower part of CB (CB3) and PV in the nuclear VVER1000/320 type reactor operated in nuclear power plant (NPP) Temelın in the Czech Republic. Normal contact force Ni transmitted by coupling i for general starting position of the CB3 on the level of K-G coupling plane relative to the reactor PV, defined by shift s in direction determined by angle α (see Fig. 4), can be expressed in the form. According to (3), the amplitude in K-G coupling i corresponding to mode shape ν can be expressed in the form ai,ν = dTi vν, where vν is the eigenvector in the configuration space of reactor generalized coordinates. Eigenfrequencies Ω20, Ω34 and Ω36 (see Table 2) in calculated frequency range up to 40 Hz are the most affected by clearances in K-G couplings
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