## 5 Conclusions
\begin{tabular}{l l} \(t\) & time \\ \(\rho\) & introduced reactivity \\ \(N\) & neutron density \\ \(\beta\) & total fraction of delayed neutrons \\ \(\beta_{j}\) & fraction of the \(j\)-th group of delayed neutrons \\ \(C_{j}\) & concentration of the \(j\)-th group of delayed neutron precursors \\ \(\lambda_{j}\) & decay constant of the \(j\)-th group of delayed neutron precursors \\ \(\Lambda\) & mean neutron generation time \\ \(\tau_{c}\) & transit time of fuel salt inside the reactor core \\ \(\tau_{L}\) & transit time of fuel salt outside the reactor core \\ \(\alpha_{f}\) & Doppler feedback coefficient \\ \(\overline{T}_{f}\) & mean temperature of the primary salt \\ \(\alpha_{g}\) & temperature feedback coefficient of the graphite moderator \\ \(\overline{T}_{g}\) & mean temperature of the graphite moderator \\ \(\rho_{rad}\) & control-rod-introduced reactivity \\ \(\rho_{0}\) & initial reactivity \\ \(M_{f,i}\) & fuel mass of node \(i\) inside the core \\ \(C_{f,j}\) & average specific heat capacity of the fuel salt of node \(i\) inside the core \\ \(T_{f,i}\) & temperature of the fuel of node \(i\) in the core \\ \(\upsilon_{cz}\) & mass flow rate through the inner area \\ \(h_{fg}\) & average heat transfer coefficient between fuel salt and graphite moderator in the core \\ \(\Lambda_{fg,i}\) & heat transfer area between fuel salt and graphite of node \(i\) in the core \\ \(k_{f,i}\) & fraction of deposited fission energy in fuel of node \(i\) in the core \\ \(P_{t}\) & overall thermal power of the core \\ \(M_{g,i}\) & mass of the graphite moderator of node \(i\) \\ \(C_{g,i}\) & average specific heat capacity of the graphite moderator of node \(i\) \\ \(T_{g,i}\) & temperature of the graphite moderator of node \(i\) \\ \(k_{g,i}\) & fraction of deposited fission energy in the graphite moderator of node \(i\) \\ \(f_{r}\) & fractional mass flow rate of the fuel salt in the inner zone of the core \\ \(T_{f,cz}\) & fuel temperature of the last node (node N) of the inner region \\ \(T_{f,oz}\) & fuel temperature of the last node (node N) of the outer region \\ \(M_{p,i}\) & fuel mass of node \(i\) of the primary heat exchanger \\ \(C_{p,i}\) & average specific heat capacity of the fuel of node \(i\) of the primary heat exchanger \\ \(T_{p,i}\) & fuel temperature of node \(i\) of the primary heat exchanger \\ \(w_{p}\) & mass flow rate of the primary salt \\ \(h_{pt}\) & average heat transfer coefficient between the fuel and wall in the primary heat exchanger \\ \(A_{pt,i}\) & heat transfer area between the fuel and wall in the primary heat exchanger \\ \(M_{t,i}\) & piping wall mass of node \(i\) of the primary heat exchanger \\ \(C_{t,i}\) & average specific heat capacity of the wall in node \(i\) of the primary heat exchanger \\ \(T_{t,i}\) & temperature of the wall in node \(i\) of the primary heat exchanger \\ \(M_{s,j}\) & mass of the secondary salt in node \(i\) of the primary heat exchanger \\ \(C_{s,j}\) & average specific heat capacity of the secondary salt of node \(i\) of the primary heat exchanger \\ \(T_{s,i}\) & secondary salt temperature of node \(i\) of the primary heat exchanger \\ \(w_{s}\) & mass flow rate of the secondary salt \\ \(h_{st}\) & secondary salt and wall heat transfer coefficient in the primary heat exchanger \\ \(A_{st,i}\) & secondary salt and wall heat transfer area in the primary heat exchanger \\ \(M_{ss,i}\) & mass of the secondary salt of node \(i\) of the steam generator \\ \(C_{ss,i}\) & average specific heat capacity of the secondary salt of node \(i\) of the steam generator \\ \(T_{ss,i}\) & secondary salt temperature of node \(i\) in the steam generator \\ \(w_{ss}\) & mass flow rate of the secondary salt \\ \(h_{stu}\) & secondary salt and wall heat transfer coefficient in the steam generator \\ \(A_{su,i}\) & heat transfer area between the salt and wall in the steam generator \\ \(M_{u,i}\) & U-tube wall mass of the steam generator \\ \(T_{u,i}\) & U-tube wall temperature of the steam generator \\ \(M_{u,j}\) & mass of the water/steam of node \(i\) of the steam generator \\ \(C_{w,j}\) & average specific heat capacity of the feedwater/steam of node \(i\) of the steam generator \\ \(T_{w,j}\) & water/steam temperature of steam generator \\ \end{tabular}