Power is developed in the RBMK by both the mechanisms of fission and radioactive decay. Much of the power is deposited in the fuel itself. A portion of the power is released in the form of g or neutron radiation. It is estimated that approximately 5% of the total fission and decay energy is deposited directly into the graphite structures. Energy loss to the CRCC, purification system are conservatively neglected. The energy deposition results are summarized as follows;
|
Material |
Fission |
Decay |
Total |
|
Fuel |
95.49% |
88.88% |
95.0% |
|
Graphite |
4.51% |
11.12% |
5.0% |
|
Total |
100% |
100% |
100.0% |
RELAP5 provides the fission and decay heat power from the reactor physics package. The total energy to the graphite and the fuel are calculated for the fuel and graphite temperature response calculations.
Total fission power and decay heat
First, the fission power and decay power are obtained from the reactor physics package.
1 CV-1 = fission power
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20500100
W1(A) ALPHANUMERIC NAME = fipower
W2(A) CONTROL COMPONENT TYPE = constant
W3(R) SCALING FACTOR = 3.908659e+9
For a constant component, this quantity is the constant value. No additional words are entered on this card, and cards 205CCC01 through 205CCC09 or 205CCCC1 through 205CCCC9 are not entered.
2 CV-2 = decay heat power
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20500200
W1(A) ALPHANUMERIC NAME = dkpower
W2(A) CONTROL COMPONENT TYPE = constant
W3(R) SCALING FACTOR = 2.91341e+8
For a constant component, this quantity is the constant value. No additional words are entered on this card, and cards 205CCC01 through 205CCC09 or 205CCCC1 through 205CCCC9 are not entered.
Decay heat and fission power deposited in the graphite
The amount of fission energy deposited directly into the graphite moderator is evaluated.
3 CV-3 = Percentage of fission power deposited in the graphite blocks
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20500300
W1(A) ALPHANUMERIC NAME = modfi
W2(A) CONTROL COMPONENT TYPE = constant
Specifies a constant variable.
W3(R) SCALING FACTOR = 0.0451
4.51% of the fission power is directly deposited in the graphite blocks.
The amount of fission energy deposited in the graphite is evaluated next.
4 CV-4 = (Total fission power)*(% deposited in the graphite blocks)
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20500400
W1(A) ALPHANUMERIC NAME = modfipow
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a lag variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 182576304.
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20500401
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = cntrlvar 003
Percentage of fission power deposited in the graphite
W3(A) & W4(I) VARIABLE REQUEST CODE V2 = cntrlvar 001
Total fission power
The amount of decay energy deposited directly into the graphite moderator is evaluated.
5 CV-5 = Percentage of decay heat power deposited in the graphite blocks
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20500500
W1(A) ALPHANUMERIC NAME = moddk
W2(A) CONTROL COMPONENT TYPE = constant
Specifies a constant variable.
W3(R) SCALING FACTOR = 0.1112
11.12% of the decay heat power is directly deposited in the graphite blocks.
6 CV-6 = (Total fission power)*(% deposited in the graphite blocks)
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20500600
W1(A) ALPHANUMERIC NAME = moddkpow
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a multiplier variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 33554044.0
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20500601
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = cntrlvar 005
Percentage of decay heat power deposited in the graphite
W3(A) & W4(I) VARIABLE REQUEST CODE V2 = cntrlvar 002
Total decay heat power
Decay heat and fission power deposited in the fuel
The energy deposited in the fuel is the remaining fission and decay heat energy.
7 CV-7 = total fission power - fission power deposited in graphite blocks
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20500700
W1(A) ALPHANUMERIC NAME = ffipow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 3.86568e+9
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20500701
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 001
Total fission power from the reactor physics package
W5(R) GAIN FOR V1 = -1.0
W6(A) & W7(I) VARIABLE REQUEST CODE V1 = cntrlvar 004
Total fission power directly deposited in the graphite blocks
8 CV-8 = total decay heat power - decay heat power deposited in graphite blocks
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20500800
W1(A) ALPHANUMERIC NAME = fdkpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 2.68191e+8
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20500801
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 002
Total decay heat power from the reactor physics package
W5(R) GAIN FOR V1 = -1.0
W6(A) & W7(I) VARIABLE REQUEST CODE V1 = cntrlvar 006
Total decay power directly deposited in the graphite blocks
Total power to the fuel
Finally, the fission and decay energy are added together to yield the total energy to the fuel and the graphite moderator. The total core power is given in Control Variable 11.
9 CV-9 = fission power to the fuel + decay heat power to the fuel
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20500900
W1(A) ALPHANUMERIC NAME = fuelpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 4.13387e+9
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20500901
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 007
Total fission power deposited directly into the fuel
W5(R) GAIN FOR V1 = 1.0
W6(A) & W7(I) VARIABLE REQUEST CODE V1 = cntrlvar 008
Total decay power directly deposited into the fuel
Total power to the graphite
10 CV-10 = fission power to graphite + decay heat power to the graphite
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20501000
W1(A) ALPHANUMERIC NAME = modpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 216130352.0
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20501001
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 004
Total fission power deposited directly into the graphite blocks
W5(R) GAIN FOR V1 = 1.0
W6(A) & W7(I) VARIABLE REQUEST CODE V1 = cntrlvar 006
Total decay power directly deposited into the graphite blocks
Total power
The total power is the sum of the fission power and the decay heat power.
11 CV-11 = fission power to graphite + decay heat power to the graphite
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 2050110
W1(A) ALPHANUMERIC NAME = totpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 4.20+9
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20501101
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 001
Total fission power
W5(R) GAIN FOR V1 = 1.0
W6(A) & W7(I) VARIABLE REQUEST CODE V1 = cntrlvar 002
Total decay heat power directly
LHS fuel and graphite power
12 CV-12 = LHS Channel fuel power (50% of the total)
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20501200
W1(A) ALPHANUMERIC NAME = fuelpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 0.5
50% of the total fuel power.
W4(R) INITIAL VALUE = 2.066935e+9
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20501201
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 009
Total fission and decay power to the fuel
13 CV-13 = LHS Graphite Power (50% of the total)
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20501300
W1(A) ALPHANUMERIC NAME = modpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 0.5
50% of the total graphite power.
W4(R) INITIAL VALUE = 108065176.0
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20501301
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 010
Total fission and decay power to the graphite blocks.
RHS fuel and graphite power
14 CV-14 = RHS Channel fuel power (per RHS channel, 47.42236% of the total (788 fuel channels))
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20501400
W1(A) ALPHANUMERIC NAME = fuelpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 4.742236e-1
47.42236% of the total fuel power.
W4(R) INITIAL VALUE = 1.96028e+9
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20501401
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 009
Total fission and decay power to the fuel
15 CV-15 = RHS Graphite Power (per RHS channel, 47.42236% of the total)
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20501500
W1(A) ALPHANUMERIC NAME = modpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 4.742236e-1
47.42236% of the total graphite power.
W4(R) INITIAL VALUE = 1.02489e+8
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20501501
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 010
Total fission and decay power to the graphite blocks.
16 CV-16 = RHS Channel fuel power (per RHS channel, 2.4674048% of the total (41 fuel channels))
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20501600
W1(A) ALPHANUMERIC NAME = fuelpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 2.4674048e-2
2.4674048% of the total fuel power.
W4(R) INITIAL VALUE = 102096656.0
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20501601
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 009
Total fission and decay power to the fuel
17 CV-17 = RHS Graphite Power (per RHS channel, 2.4674048% of the total (41 fuel channels))
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20501700
W1(A) ALPHANUMERIC NAME = modpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 2.4674048e-2
47.42236% of the total graphite power.
W4(R) INITIAL VALUE = 5337901.0
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20501701
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 010
Total fission and decay power to the graphite blocks.
24 CV-24 = RHS Channel fuel power (per RHS channel, 0.0892857 % of the total (one fuel channel))
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20502400
W1(A) ALPHANUMERIC NAME = fuelpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 0.0892857e-3
2.4674048% of the total fuel power.
W4(R) INITIAL VALUE = 3690954.0
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20502401
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 009
Total fission and decay power to the fuel
25 CV-25 = RHS Graphite Power (per RHS channel, 0.0892857% of the total (one fuel channel))
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20502500
W1(A) ALPHANUMERIC NAME = modpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 0.0892857 e-3
47.42236% of the total graphite power.
W4(R) INITIAL VALUE = 192973.5
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20502501
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 010
Total fission and decay power to the graphite blocks.
26 CV-26 = RHS Channel fuel power (per RHS channel, 0.0209524 % of the total (one fuel channel))
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20502600
W1(A) ALPHANUMERIC NAME = fuelpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 0.0209524e-3
2.4674048% of the total fuel power.
W4(R) INITIAL VALUE = 866145.0
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20502601
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 009
Total fission and decay power to the fuel
27 CV-27 = RHS Graphite Power (per RHS channel, 0.0209524% of the total (one fuel channel))
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20502700
W1(A) ALPHANUMERIC NAME = modpow
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 0.0209524e-3
47.42236% of the total graphite power.
W4(R) INITIAL VALUE = 45284.5
Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20502701
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 010
Total fission and decay power to the graphite blocks.