RELAP5 does not include terms for the heat energy dissipation of fluids due to wall friction [ ]. This is not a significant amount of energy relative to the reactor fission power. However, during full flow conditions after the fission reaction has been shutdown, the dissipative heat energy can be important relative to the core decay heat energy. The energy that is dissipated around the MCC is evaluated by determining the energy added to the fluid in the MCPs. It is evaluated as follows,
Pfluid ~ PShaft = TMCP * wMCP
where,
Pfluid Heat dissipation to the fluid due to viscous heating [W]
PShaft Shaft power to the fluid from the pumps [W]
TMCP Pump torque [N-m]
wMCP Pump velocity [rad/s]
LHS MCP Heat Dissipation Energy
20 CV-20 = Pfluid ~ PShaft = TMCP * wMCP (LHS MCP)
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20502000
W1(A) ALPHANUMERIC NAME = pmplhs
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a multiply variable.
W3(R) SCALING FACTOR = -1.0
W4(R) INITIAL VALUE = 13638631.0
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 20502001
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = pmptrq 135
LHS MCP pump torque to the fluid.
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = pmpvel 135
LHS MCP velocity.
RHS MCP 1 Heat Dissipation Energy
21 CV-21 = Pfluid ~ PShaft = TMCP * wMCP (RHS 1 MCP)
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20502100
W1(A) ALPHANUMERIC NAME = pmprhs1
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a multiply variable.
W3(R) SCALING FACTOR = -1.0
W4(R) INITIAL VALUE = 4526142.0
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 20502101
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = pmptrq 535
RHS 1 MCP torque to the fluid.
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = pmpvel 535
RHS 1 MCP velocity.
RHS MCP 2 Heat Dissipation Energy
22 CV-22 = Pfluid ~ PShaft = TMCP * wMCP (RHS 2 MCP)
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20502200
W1(A) ALPHANUMERIC NAME = pmprhs2
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a multiply variable.
W3(R) SCALING FACTOR = -1.0
W4(R) INITIAL VALUE = 4526142.0
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 20502201
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = pmptrq 635
RHS 2 MCP torque to the fluid.
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = pmpvel 635
RHS 2 MCP velocity.
RHS MCP 3 Heat Dissipation Energy
23 CV-23 = Pfluid ~ PShaft = TMCP * wMCP (RHS 3 MCP)
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20502300
W1(A) ALPHANUMERIC NAME = pmprhs3
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a multiply variable.
W3(R) SCALING FACTOR = -1.0
W4(R) INITIAL VALUE = 4526142.0
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 20502301
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = pmptrq 835
RHS 3 MCP torque to the fluid.
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = pmpvel 835
RHS 3 MCP velocity.