scholarly journals Analysis of Reactivity Accident for Control Rods Withdrawal at the Thermal Reactor

2014 ◽  
Vol 3 (2) ◽  
pp. 21-40 ◽  
Author(s):  
Hend M Saad ◽  
Aziz M ◽  
Mansour H.M
Keyword(s):  
Thermal Reactor ◽  
Control Rods ◽  
Reactivity Accident

Dispersion type absorbing materials for thermal reactor control rods

1964 ◽  
Vol 17 (2) ◽  
pp. 815-820
Author(s):  
V. I. Nosov ◽  
N. N. Ponomarev-Stepnoi ◽  
K. I. Portnoi ◽  
E. G. Savel'yev
Keyword(s):  
Thermal Reactor ◽  
Reactor Control ◽  
Absorbing Materials ◽  
Control Rods

scholarly journals Model of Reactivity Accident of the RBMK-1000 of the Chornobyl NPP 4th Power Unit

2021 ◽  
Vol 21 (2) ◽  
pp. 39-48
Author(s):  
V. I. Borysenko ◽  
◽  
V. V. Goranchuk ◽  
Keyword(s):  
Power Unit ◽  
Nuclear Reactor ◽  
Reactor Core ◽  
Coolant Temperature ◽  
Fuel Temperature ◽  
Reactor Accident ◽  
Reactivity Coefficients ◽  
Accident Scenarios ◽  
Control Rods ◽  
Reactivity Accident

The article presents the results of modeling of the reactivity accident, which resulted in the destruction of reactor RBMK-1000 of the 4th power unit of the Chornobyl NPP on April 26, 1986. The RBMK-1000 reactivity accident model was developed on the basis of the kinetics of the nuclear reactor, taking into account the change in the reactivity of the reactor. Reactivity changes as a result of both external influence (movement of control rods; change in the reactor inlet coolant temperature (density)) and due to the action of reactivity feedback by the parameters of the reactor core (change in the fuel temperature, coolant temperature, concentration of 135Хе, graphite stack temperature, etc.). A similar approach was applied by the authors of the article for the study of transient processes with the operation of accelerated unit unloading mode on VVER-1000, and the validity of such model is confirmed. The study of the reactivity accident on RBMK-1000 was carried out for various combinations of values of the effectiveness of control rods; reactivity coefficients of the coolant temperature and fuel temperature; changes in the temperature of the coolant at the inlet to the reactor. In most of the studied RBMK-1000 reactor accident scenarios, the critical values of fuel enthalpy, at which the process of fuel destruction begins, are reached first. An important result of the research is the conclusion that it is not necessary to reach supercriticality on instantaneous neutrons, supercriticality on delayed neutrons is also sufficient to initiate fuel destruction.

Dispersion-type absorber materials for thermal reactor control rods

1965 ◽  
Vol 19 (9) ◽  
pp. 720-728
Author(s):  
V.I. Nosov ◽  
N.N. Ponomarev-stepnoi ◽  
K.I. Portnoi ◽  
E.G. Savel'ev
Keyword(s):  
Thermal Reactor ◽  
Reactor Control ◽  
Control Rods
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