CONTROL RODS
DOE-HDBK-1019/2-93
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.
Interval Endpoint
Summed Reactivity
2
10
4
30
6
70
8
130
10
190
12
230
14
250
16
260
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.
NP-03
Rev. 0
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