A proportional-integral controller will be used to control the steam drum separator liquid level during normal operating and transient conditions. The steam drum control logic specifies the system flowrate for the feedwater and auxiliary feedwater injection systems [ ].
System Inputs for the Feedwater Controller
The drum separate level control is evaluated by comparing the drum liquid level, the drum level setpoint, the non-dimensional reactor power, and the non-dimensional feedwater flow [8].
e(t) = HDSSP + HDSCOR - HDSCUR + k1*Nrcur - k2*FFW + k3*Haux
where,
e(t) Mismatch signal, e
HDSSP Setpoint level signal (0 mm)
HDSCOR Corrective regulator signal
HDSCUR Current Drum Separator signal
k1*Nrcur Reactor capacity signal
k2*FFW Feedwater flowrate signal
k3*Haux Auxiliary signal
The feedwater valve command signal is given as follows,
U = ap*{ e(t) + 1/t*òe(t)dt }
where,
U Valve command signal
ap Coefficient of proportionally
t Time coefficient of the regulation unit
The scaling coefficients are given as follows [4];
k1 = 0.72
k2 = 0.8
k3 ~ 0.0 + 0.023
ap = 1.3 s/%
t = 25 s
Based on conversations with the Ignalina Nuclear Power Plant personnel [4], the Auxiliary Signal, Haux, and the Corrective Regulator Signal, HDSCOR, are not generally important to the calculation of the feedwater flowrate. Consequently, these signals will be neglected. The remaining signals are calculated using control functions as follows;
Non-dimensional Reactor Capacity, Nrcur
The reactor capacity is calculated based on the load demand at the turbogenerators. The turbogenerators are not modeled in the RBMK model. Consequently, the capacity must be estimated using the reactor power. An estimated 5 s lag is applied to account for time delays in the hydraulic transport.
200 CV-200 = P/P0 = (rktpow 0)/4.650e9 W
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20520000
W1(A) ALPHANUMERIC NAME = power
W2(A) CONTROL COMPONENT TYPE = constant
W3(R) SCALING FACTOR = 1.0
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.
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20519900
W1(A) ALPHANUMERIC NAME = pow-err
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20519901
W1(R) ADDITIVE CONSTANT = -1.0
Additive constant.
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 200
Non-dimensional Feedwater Flow, FFW
The reactor feedwater flow is based on the calculated nominal flow at steady state conditions. The steady state feedwater flow is 1178 kg/s, per side of the reactor. The auxiliary and main feedwater flows are added together to evaluate the total feedwater into the system. Due to the trip logic, only one system will be active at any time. Separate feedwater flows are required for the LHS and the RHS.
210 CV-210 = (mfw + afw ) / 1178.0 kg/s
where,
mfw main feedwater flow for the LHS steam drums
afw auxiliary feedwater flow for the LHS steam drums
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20521000
W1(A) ALPHANUMERIC NAME = lhs_fw
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 8.4890e-4
The mass flow is scaled by 1/1178 kg/s.
W4(R) INITIAL VALUE = 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 205CCC01, CONTROL COMPONENT DATA CARDS
Cards 20521001-02
W1(R) ADDITIVE CONSTANT = -1178.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = mflowj 107000000
Main feedwater flowrate for the LHS steam drums.
W5(R) GAIN FOR V2 = 1.0
W6(A) & W7(I) VARIABLE REQUEST CODE V2 = mflowj 402000000
Auxiliary feedwater flowrate for the LHS steam drums.
220 CV-220 = (mfw + afw ) / 1178.0 kg/s
where,
mfw main feedwater flow for the RHS steam drum
afw auxiliary feedwater flow for the RHS steam drum
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20522000
W1(A) ALPHANUMERIC NAME = rhs_fw1
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 8.4890e-4
The mass flow is scaled by 1/1178.0 kg/s.
W4(R) INITIAL VALUE = 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 205CCC01, CONTROL COMPONENT DATA CARDS
Cards 20522001-02
W1(R) ADDITIVE CONSTANT = -1178.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = mflowj 507000000
Main feedwater flowrate for the RHS steam drum.
W5(R) GAIN FOR V2 = 1.0
W6(A) & W7(I) VARIABLE REQUEST CODE V2 = mflowj 422000000
Auxiliary feedwater flowrate for the RHS steam drum.
Drum Separator Setpoint, HDSSP
201 CV-201 = 0 mm (normal setpoint)
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20520100
W1(A) ALPHANUMERIC NAME = lvl_set
W2(A) CONTROL COMPONENT TYPE = constant
Specifies a constant setpoint
W3(R) SCALING FACTOR = 0.0 mm
Constant steam drum setpoint.
W4(R) INITIAL VALUE = 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.
Drum Separator Current Level, HDScur
211 CV-211 = LHS steam drum level [mm]
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20521100
W1(A) ALPHANUMERIC NAME = lhs_lvl
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 0.543149
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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20521101
W1(R) ADDITIVE CONSTANT = 936.0
Scaling factor, Lo, to give the correct initial level
W2(R) GAIN FOR V1 = -2600.0
Diameter of the steam drum in [mm]
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = voidg 100010000
RHS steam drum void fraction.
221 CV-221 = RHS steam drum level [mm]
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20522100
W1(A) ALPHANUMERIC NAME = rhs_lvl
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = Initial conditions established after steady state simulation.
W5(I) INITIAL VALUE FLAG = 0.614299
Zero means no initial value calculation and W4 is used as the initial condition.
CARD 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20522101
W1(R) ADDITIVE CONSTANT = 936.0
Scaling factor, Lo, to give the correct initial level
W2(R) GAIN FOR V1 = -2600.0
Diameter of the steam drum in [mm]
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = voidg 500010000
RHS steam drum void fraction.
Drum Separator Mismatch Signal, e(t)
The steam drum mismatch signal is generated as discussed above. As discussed, the Auxiliary Signal, Haux, and the Corrective Regulator Signal, HDSCOR, are not included. Separate signals are generated for the LHS steam drum and the two RHS steam drums. However, the level errors are averaged between the two RHS steam drums to assure a symmetric response.
ap e(t) = 0.013 {HDSSP - HDSCUR + 0.72*Nrcur - 0.80*FFW}
where,
ap 1.3%/s, or 0.013/s
212 CV-212 = LHS Steam Drum Level Error Signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20521200
W1(A) ALPHANUMERIC NAME = lhs_err
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
The scaling factor
W4(R) INITIAL VALUE = 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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20521201
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 201
Steam drum level setpoint
Card 20521202
W1(R) GAIN FOR V2 = -7.692e-4
W2(A) & W3(I) VARIABLE REQUEST CODE V2 = cntrlvar 211
Current LHS steam drum level [mm]
Card 20521203
W1(R) GAIN FOR V3 = 0.72
W2(A) & W3(I) VARIABLE REQUEST CODE V3 = cntrlvar 199
Non-dimensional power coefficient signal
Card 20521204
W1(R) GAIN FOR V4 = -0.80
W2(A) & W3(I) VARIABLE REQUEST CODE V4 = cntrlvar 210
Non-dimensional feedwater signal
222 CV-222 = RHS Steam Drum Level Error Signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20522200
W1(A) ALPHANUMERIC NAME = rhs_err1
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
The scaling factor
W4(R) INITIAL VALUE = 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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20522201
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 201
Steam drum level setpoint
Card 20522202
W1(R) GAIN FOR V2 = -7.692e-4
W2(A) & W3(I) VARIABLE REQUEST CODE V2 = cntrlvar 221
Current RHS steam drum level [mm]
Card 20522203
W1(R) GAIN FOR V3 = 0.72
W2(A) & W3(I) VARIABLE REQUEST CODE V4 = cntrlvar 200
Non-dimensional power coefficient signal
Card 20522204
W1(R) GAIN FOR V4 = -0.80
W2(A) & W3(I) VARIABLE REQUEST CODE V5 = cntrlvar 220
Non-dimensional feedwater signal
Error Signal Adjustment for Transients
200 Table of the Steam Drum Level Error Signals
CARD 202TTT00, TABLE TYPE AND MULTIPLIER DATA
Card 20220000
W1(A) TABLE TYPE = reac-t
react-t specifies a table type for reactivity versus time. Although the data in this table does not have to represent reactivity versus time data, it is a common practice to use this option when no units conversion is desired.
CARD 202TTT01 THROUGH 202TTT99, GENERAL TABLE DATA
|
Card Number |
Independent Variable [s] |
Reactivity [$] |
|
20220001 |
-2.6e+2 |
-2.6e+1 |
|
20220002 |
-2.6e-2 |
-2.6e-3 |
|
20220003 |
-2.6e-3 |
-2.6e-3 |
|
20220004 |
2.6e-3 |
2.6e-3 |
|
20220005 |
2.6e-2 |
2.6e-3 |
|
20220006 |
2.6e+2 |
2.6e+1 |
213 CV-213 = LHS Steam Drum Level Error Signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20521300
W1(A) ALPHANUMERIC NAME = lhs_err
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
The scaling factor
W4(R) INITIAL VALUE = -0.00843068
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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20521301
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 212
LHS error signal
223 CV-223 = RHS 1 Steam Drum Level Error Signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20522300
W1(A) ALPHANUMERIC NAME = rhs1_err
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1.0
The scaling factor
W4(R) INITIAL VALUE = -0.00933051
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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20521301
W1(R) ADDITIVE CONSTANT = 0.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 222
RHS 1 error signal
Drum Integral Mismatch Signal, 1/t òape(t)dt
The integral of the steam drum mismatch signal is generated as discussed above. Separate signals are generated for the LHS steam drum and the two RHS steam drums.
1/t òape(t)dt = 0.04 òape(t)dt
214 CV-214 = LHS Steam Drum Level Integral Error Signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20521400
W1(A) ALPHANUMERIC NAME = lhs_int
W2(A) CONTROL COMPONENT TYPE = integral
Specifies an integral variable.
W3(R) SCALING FACTOR = 0.04
1/25 s scaling factor
W4(R) INITIAL VALUE = 0.093945
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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20521401
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = cntrlvar 213
LHS steam drum level error signal
224 CV-224 = ò (RHS Steam Drum Level Integral Error Signal) dt
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20522400
W1(A) ALPHANUMERIC NAME = rhs_int1
W2(A) CONTROL COMPONENT TYPE = integral
Specifies an integral variable.
W3(R) SCALING FACTOR = 0.04
1/25 s scaling factor
W4(R) INITIAL VALUE = 0.0923037
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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20522401
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = cntrlvar 223
RHS steam drum level error signal
Main Feedwater or Auxiliary Feedwater Control Logic
The control of the feedwater flow versus auxiliary feedwater must be determined. It is assumed that main feedwater flow is active unless the following signals are active.
• Sharp pressure change in the deaerators
• Loss-of-offsite power
• Manual trip
Auxiliary feedwater is activated under the following signals
• Long-term ECCS Signal (see Section 4.1)
• 1 minute diesel startup time with a loss-of-offsite power [ ]
The following trip logic is performed to evaluate the termination of the feedwater flow. The inverse trip signal is evaluated and lagged to simulate the coast down of the feedwater pumps after they are tripped. Since the dearators are not modeled, the dearator pressure signal is not considered.
320 Manual main feed water trip occurs when time > 1.e6 s (e.g., never active)?
CARD 206CCCC0, EXPANDED VARIABLE TRIP CARD
Card 20603200
W1(A) VARIABLE CODE = time
W2(I) PARAMETER = 0
W1(A) and W2(I) represent the current transient time
W3(A) RELATIONSHIP = gt
W4(A) VARIABLE CODE = null
W5(I) PARAMETER = 0
No comparison value is entered for the second variable
W6(R) ADDITIVE CONSTANT = 1.e6
This is an arbitrarily large user-specified time.
W7(A) LATCH INDICATOR = l
W8(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1320 Is there a loss of offsite power or a manual main feedwater trip?
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20613200
W1(I) TRIP NUMBER = 102
Loss-of offsite power
W2(A) OPERATOR = or
W3(I) TRIP NUMBER = 320
Manual feedwater trip
W4(A) LATCH INDICATOR = l
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1321 Is there a loss of offsite power, a manual main feedwater trip, or a short-term ECCS signal?
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20613210
W1(I) TRIP NUMBER = 1320
Loss-of-offsite power or manual mfw trip
W2(A) OPERATOR = or
W3(I) TRIP NUMBER = 1110
Short-term ECCS signal
W4(A) LATCH INDICATOR = l
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
202 CV-202 = Main feedwater pump trip signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20520200
W1(A) ALPHANUMERIC NAME = mfw_trip
W2(A) CONTROL COMPONENT TYPE = tripunit
Specifies a tripunit variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20520201
W1(I) TRIP VARIABLE = -1321
No main feedwater pump trip
203 CV-203 = Lag of the main feedwater pump trip signal to simulate coast down
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20520300
W1(A) ALPHANUMERIC NAME = mfw_lag
W2(A) CONTROL COMPONENT TYPE = lag
Specifies a lag variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20520301
W1(I) LAG TIME = 0.5 s
Lag time set to 0.5 s to simulate feedwater pump coast down. Similar to the coast down behavior simulated in the Station Blackout simulation.
W2(A) & W3(I) VARIABLE REQUEST CODE V1 = cntrlvar 202
Main feedwater pump trip signal
Trip logic is required to control the auxiliary feedwater flow. A 1 minute diesel startup delay is applied to the auxiliary feedwater flow during a loss-of-offsite power. Furthermore, the auxiliary feedwater will be directed to the long-term ECCS if there is a Group 2 Signal.
1330 Has there been a main feedwater pump trip and has the 60 s delay for the diesel has startup passed if there was a loss-of-offsite power?
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20613300
W1(I) TRIP NUMBER = 1321
Main feedwater pump trip signal
W2(A) OPERATOR = and
W3(I) TRIP NUMBER = 1123
No loss-of-offsite power or the 60 s delay to start the diesels has passed.
W4(A) LATCH INDICATOR = n
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
1331 Has there been a main feedwater pump trip, the 60 s delay for the diesel startup passed if there was a loss-of-offsite power, and there is no ECCS Group 2 Signal?
CARD 206CCCC0, EXPANDED LOGICAL TRIP CARD
Card 20613310
W1(I) TRIP NUMBER = 1330
Main feedwater pump trip signal and the delays (if any) to start the auxiliary feedwater have passed.
W2(A) OPERATOR = and
W3(I) TRIP NUMBER = -1125
No Group 2 (long-term) ECCS signal. If there is a long-term ECCS signal, the auxiliary feedwater flow is directed to the GDH.
W4(A) LATCH INDICATOR = n
W5(R) TIMEOF QUANTITY (s) = It was set to either true (0.0) or false (-1.0) at the initiation of the transient
The auxiliary feedwater flow will be controlled trip logic and control variables. A lag is used to simulate the time to buildup to full flow.
205 CV-205 = Lag of the auxiliary feedwater pump actuation signal to simulate coastdown
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20520500
W1(A) ALPHANUMERIC NAME = afw_trip
W2(A) CONTROL COMPONENT TYPE = tripunit
Specifies a tripunit variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20520501
W1(I) TRIP NUMBER = 1330
Auxiliary feedwater trip signal
206 CV-206 = Lag of the auxiliary feedwater signal to simulate startup time
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20520600
W1(A) ALPHANUMERIC NAME = afw_lag
W2(A) CONTROL COMPONENT TYPE = lag
Specifies a lag variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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 205CCC01, CONTROL COMPONENT DATA CARDS
Card 20520601
W1(I) LAG TIME = 2.0 s
Lag time set to 2.0 s to simulate the auxiliary feedwater pump startup
W2(A) & W3(I) VARIABLE REQUEST CODE V1 = cntrlvar 205
Auxiliary pump trip signal
LHS Feedwater Flow Signal
215 CV-215 = 1072.6 * U for the LHS
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20521500
W1(A) ALPHANUMERIC NAME = lhs_pi
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1072.6
Scaling factor to convert the valve signal to a feedwater flow
W4(R) INITIAL VALUE = 1072.6
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 20521501
W1(R) ADDITIVE CONSTANT = 1.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 213
Proportional error signal for the LHS steam drum
Card 20521502
W1(R) GAIN FOR V2 = 1.0
W2(A) & W3(I) VARIABLE REQUEST CODE V2 = cntrlvar 214
Integral error signal for the LHS steam drum
Next, the main feedwater demand signal is multiplied by the main feedwater trip signal. When the main feedwater pumps trip, the demand signal will be multiplied by zero.
216 CV-216 = Valve command signal * main feedwater trip signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20521600
W1(A) ALPHANUMERIC NAME = lhs_trip
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a multiply variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 1165.842
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 20521601
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = cntrlvar 215
Main feedwater demand signal
W3(A) & W4(I) VARIABLE REQUEST CODE V2 = cntrlvar 203
Main feedwater trip signal
217 CV-217 = Lag of the final main LHS feedwater demand signal to remove any numerical sensitivities
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20521700
W1(A) ALPHANUMERIC NAME = lhs_mfw
W2(A) CONTROL COMPONENT TYPE = lag
Specifies a lag variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 1165.826
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.
W6(I) LIMITER CONTROL = 3
3 if both minimum and maximum limits are to be imposed.
W7(R) MINIMUM VALUE = 0.0
W8(R) MAXIMUM VALUE = 1.500e+3
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20521701
W1(I) LAG TIME = 0.05 s
Lag time set to 0.05 s to reduce numerical sensitivities to timestep size
W2(A) & W3(I) VARIABLE REQUEST CODE V1 = cntrlvar 216
Main LHS feedwater demand signal
RHS Feedwater Flow Signal
The control logic for Control Variables 215, 216, and 217 is repeated for RHS feedwater pumps. The valve scale factor for the RHS is 250.0 since each individual pump is modeled.
225 CV-225 = 250.0 * U for the RHS 1
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20522500
W1(A) ALPHANUMERIC NAME = rhs1_pi
W2(A) CONTROL COMPONENT TYPE = sum
Specifies a sum variable.
W3(R) SCALING FACTOR = 1072.6
Valve scale factor.
W4(R) INITIAL VALUE = 1072.6
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 20522501
W1(R) ADDITIVE CONSTANT = 1.0
W2(R) GAIN FOR V1 = 1.0
W3(A) & W4(I) VARIABLE REQUEST CODE V1 = cntrlvar 223
Proportional error signal for the RHS steam drum
Card 20522502
W1(R) GAIN FOR V2 = 1.0
W2(A) & W3(I) VARIABLE REQUEST CODE V2 = cntrlvar 224
Integral error signal for the RHS steam drum
Next, the main feedwater demand signal is multiplied by the main feedwater trip signal. When the main feedwater pumps trip, the demand signal will be multiplied by zero.
226 CV-226 = Valve command signal * main feedwater trip signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20522600
W1(A) ALPHANUMERIC NAME = rhs_trip
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a multiply variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 1163.097
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 20522601
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = cntrlvar 225
Main RHS 1 steam drum feedwater demand signal
W3(A) & W4(I) VARIABLE REQUEST CODE V2 = cntrlvar 203
Main feedwater trip signal
227 CV-227 = Lag of the final main RHS feedwater demand signal to remove any numerical sensitivities
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20522700
W1(A) ALPHANUMERIC NAME = rhs_mfw
W2(A) CONTROL COMPONENT TYPE = lag
Specifies a lag variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 1163.097
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.
W6(I) LIMITER CONTROL = 3
3 if both minimum and maximum limits are to be imposed.
W7(R) MINIMUM VALUE = 0.0
W8(R) MAXIMUM VALUE = 1.500e+3
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20522701
W1(I) LAG TIME = 0.05 s
Lag time set to 0.05 s to reduce numerical sensitivities to timestep size
W2(A) & W3(I) VARIABLE REQUEST CODE V1 = cntrlvar 226
Main RHS feedwater demand signal
Auxiliary Feedwater Flow
The auxiliary feedwater is controlled in a similar manner. The flow demand signal is multiplied times the auxiliary actuation logic to specify the auxiliary feedwater flowrate. The signal is lagged to smooth transitions. The maximum flow through the auxiliary feedwater system is 350 kg/s through 5 pumps.
LHS Auxiliary Feedwater Flow Signal
The auxiliary feedwater demand signal is multiplied by the auxiliary feedwater trip signal. When the auxiliary feedwater pumps are signaled to activate, the demand signal will be multiplied by one. Otherwise, no auxiliary feedwater flow is permitted.
218 CV-218 = Valve command signal * auxiliary feedwater trip signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20521800
W1(A) ALPHANUMERIC NAME = lhs_trip
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a multiply variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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 20521801
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = cntrlvar 215
Main feedwater demand signal
W3(A) & W4(I) VARIABLE REQUEST CODE V2 = cntrlvar 206
Auxiliary feedwater trip signal
219 CV-219 = Lag of the final AFW demand signal to remove any numerical sensitivities
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20521900
W1(A) ALPHANUMERIC NAME = lhs_afw
W2(A) CONTROL COMPONENT TYPE = lag
Specifies a lag variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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.
W6(I) LIMITER CONTROL = 3
3 means both minimum and maximum limits are to be imposed.
W7(R) MINIMUM VALUE = 0.0
W8(R) MAXIMUM VALUE = 3.500e+2
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20521901
W1(I) LAG TIME = 0.05 s
Lag time set to 0.05 s to reduce numerical sensitivities to timestep size
W2(A) & W3(I) VARIABLE REQUEST CODE V1 = cntrlvar 218
Auxiliary feedwater demand signal
RHS Auxiliary Feedwater Flow Signal
The control logic for Control Variables 218 and 219 is repeated for RHS 1 auxiliary feedwater pumps.
228 CV-228 = Valve command signal * auxiliary feedwater trip signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20522800
W1(A) ALPHANUMERIC NAME = rhs1_trp
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a multiply variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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 20522801
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = cntrlvar 225
Auxiliary feedwater demand signal
W3(A) & W4(I) VARIABLE REQUEST CODE V2 = cntrlvar 206
Auxiliary feedwater trip signal
229 CV-229 = Lag of the AFW demand signal to remove any numerical sensitivities
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20522900
W1(A) ALPHANUMERIC NAME = rhs1_afw
W2(A) CONTROL COMPONENT TYPE = lag
Specifies a lag variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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.
W6(I) LIMITER CONTROL = 3
3 means both minimum and maximum limits are to be imposed.
W7(R) MINIMUM VALUE = 0.0
W8(R) MAXIMUM VALUE = 1.750e+2
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20522901
W1(I) LAG TIME = 0.05 s
Lag time set to 0.05 s to reduce numerical sensitivities to timestep size
W2(A) & W3(I) VARIABLE REQUEST CODE V1 = cntrlvar 228
Auxiliary feedwater demand signal
RHS Auxiliary Feedwater Flow Signal
The control logic for Control Variables 218 and 219 is repeated for RHS 2 auxiliary feedwater pumps.
238 CV-238 = Valve command signal * auxiliary feedwater trip signal
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20523800
W1(A) ALPHANUMERIC NAME = rhs12_tr
W2(A) CONTROL COMPONENT TYPE = mult
Specifies a multiply variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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 20523801
W1(A) & W2(I) VARIABLE REQUEST CODE V1 = cntrlvar 235
Auxiliary feedwater demand signal
W3(A) & W4(I) VARIABLE REQUEST CODE V2 = cntrlvar 206
Auxiliary feedwater trip signal
239 CV-239 = Lag of the final AFW demand signal to remove any numerical sensitivities
CARD 205CCC00, CONTROL COMPONENT TYPE CARD
Card 20523900
W1(A) ALPHANUMERIC NAME = rhs12_af
W2(A) CONTROL COMPONENT TYPE = lag
Specifies a lag variable.
W3(R) SCALING FACTOR = 1.0
W4(R) INITIAL VALUE = 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.
W6(I) LIMITER CONTROL = 3
3 means both minimum and maximum limits are to be imposed.
W7(R) MINIMUM VALUE = 0.0
W8(R) MAXIMUM VALUE = 1.75e+2
CARD 205CCCXX, CONTROL COMPONENT DATA CARDS
Card 20523901
W1(I) LAG TIME = 0.05 s
Lag time set to 0.05 s to reduce numerical sensitivities to timestep size
W2(A) & W3(I) VARIABLE REQUEST CODE V1 = cntrlvar 238
Auxiliary feedwater demand signal