Journal of Nuclear Science, Engineering and Technology (JONSAT)
In cooperation with the Iranian Nuclear Society

Study of Reactivity Effect on Dynamic Behavior of VVER-1000 Reactor Core

Document Type : Research Paper

Authors

A Pazirandeh
D Saghati
Abstract
In the study of stability of VVER-1000 reactor core the state variables method and Routh criterion were used. By calculating temperature reactivity coefficients for fuel and moderator we have shown that the reactor core remains stable against 1$ reactivity or less than 1$. The coefficients were calculated for different concentration of boric acid as a function of temperature. The concentration above 1800ppm prevails itself as a positive effect. It should be noted that 1800ppm boric acid concentration had minimal effect on fuel temperature reactivity coefficient. The simulation calculation for 1$ reactivity insertion showed that the prompt neutron life time between 2 to 50µs causes sharp rise in flux for shorter lifetime, while decays remain more or less the same for 2 to 50µs prompt neutron lifetime.

Highlights

  1. D.L. Hetrick, “Dynamics of nuclear reactors, lagrange park,” American Nuclear Society (1993).

     

  2. K. Ogata, “Modern control engineering,” Publisher Prentice Hall (1997).

     

  3. L.E. Weaver, “Reactor dynamics and control,” Elsevier (1968).

     

  4. A. Hainoun, I. Khamis, G. Saba, “Dynamic analysis of the closed-loop transfer function in the minature neutron source reactor,” Nuclear Engineering and Design, 232, 19-28 (2004).

     

  5. B. ivanov, k. ivanov, P. Groudev, M. Pavlova, V. Hadjiev, VVER-1000 Coolant Transient Benchmark, US Department if Energy (2002).

     

Keywords

Stability
Reactor Dynamics
Routh Criterion
VVER-1000

  1. D.L. Hetrick, “Dynamics of nuclear reactors, lagrange park,” American Nuclear Society (1993).

     

  2. K. Ogata, “Modern control engineering,” Publisher Prentice Hall (1997).

     

  3. L.E. Weaver, “Reactor dynamics and control,” Elsevier (1968).

     

  4. A. Hainoun, I. Khamis, G. Saba, “Dynamic analysis of the closed-loop transfer function in the minature neutron source reactor,” Nuclear Engineering and Design, 232, 19-28 (2004).

     

  5. B. ivanov, k. ivanov, P. Groudev, M. Pavlova, V. Hadjiev, VVER-1000 Coolant Transient Benchmark, US Department if Energy (2002).

     

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