SUR
26.06
26.06
18.1 sec
1.44 DPM
¯
eff
eff
0.0068
( 0.00130)
0.05 sec1 ( 0.00130)
124.6 sec
SUR
26.06
26.06
124.6 sec
0.2091 DPM
P
Po et /
100 W e(120 s/124.6 s)
38.2 W
P
Po 10SUR (t)
(100 W) 10(0.2091 DPM) (2 min)
38.2 W
Reactor Theory (Reactor Operations)
DOE-HDBK-1019/2-93
REACTOR KINETICS
Rev. 0
NP-04
Page 19
Step 3:
The startup rate can be calculated from the reactor period using
Equation (4-11).
Example 2:
130 pcm of negative reactivity is added to a reactor that is initially critical at a power of
100 watts.
for the reactor is 0.05 sec and the effective delayed neutron fraction is
eff
-1
0.0068. Calculate the steady state period and startup rate. Also calculate the power
level 2 minutes after the reactivity insertion.
Solution:
Step 1:
Use Equation (4-9) to calculate the reactor period.
Step 2:
The startup rate can be calculated from the reactor period using
Equation (4-11).
Step 3:
Use either Equation (4-1) or Equation (4-10) to calculate the reactor
power two minutes after the reactivity insertion.
