Reactor Theory (Nuclear Parameters)
Integral rod worth:
To plot the integral rod worth, merely develop a cumulative total of the reactivity
added after each interval and plot the summed reactivity insertion vs. rod position
as shown in Figure 12.
If an integral rod worth curve is supplied, a differential rod worth curve can be generated from
Figure 12 Rod Worth Curves From Example 3
the integral rod worth data. Merely select a convenient interval of rod withdrawal, such as
1 inch or 2 inches. Then, determine from the curve the amount of reactivity added for each
constant interval of rod withdrawal. A plot of this reactivity addition versus rod withdrawal
represents differential rod worth.