2.8.2.3. Block 5 — INCONT — Control System Input¶

INPUT BLOCK STRUCTURE

The control system input block structure is identical to the standard SAS4A/SASSYS‑1 input block structure in all but one respect. A new card format known as a signal card has been introduced. These cards immediately follow the block identifier card and precede the standard format data cards. The ordering of the different card types is depicted as follows:

The format for the block identifier card is described above. For the control system input block the block name is “INCONT” and the block number is 5.

SIGNAL CARDS

A signal card contains data fields for the FORTRAN variables ISIG, JTYPE, J1SIG, J2SIG, F1SIG, F2SIG, F3SIG, F4SIG, and F5SIG, with record format 4I5,5F10.3. These variables are described in Table 2.8.6.

A signal card is used to define a signal in the user’s block diagram. There are four signal types: measured, demand, block, and control. Each signal must be assigned a unique signal identification number using the “ISIG” field. The value of ISIG must be greater than zero and less than 999.

Table 2.8.6 Signal Card Format¶
Column	Fortran Symbol	Definition	Variable Type
1-5	ISIG	Serial Number	Integer
6-10	JTYPE	Signal Type	Integer
11-15	J1SIG	Signal Descriptor 1	Integer
16-20	J2SIG	Signal Descriptor 2	Integer
21-30	F1SIG	Constant 1	Real
31-40	F2SIG	Constant 2	Real
41-50	F3SIG	Constant 3	Real
51-60	F4SIG	Constant 4	Real
61-70	F5SIG	Constant 5	Real

MEASURED SIGNAL

A measured signal makes available to the block diagram the present value of a referenced SAS4A/SASSYS‑1 variable. The correspondence between the variable that is referenced and the signal card data field values is given in Table 2.8.9. Note that all measured signals have a JTYPE value in the range of -50 to -89, inclusive

DEMAND SIGNAL

A demand signal makes available to the block diagram the product of the current value of a time dependent function defined by the user through a demand table and an initial condition value. A demand table is a set of ordered pair values supplied by the user in the format of Table 2.8.8 and described by Data Card Input.

The code obtains the demand signal by linearly interpolating among the table entries using the current time. The initial value is obtained as described in Section 6.4.3. The correspondence between the demand table and the signal card data fields is given in Table 2.8.9. Note that a demand signal has a JTYPE value of -90.

BLOCK SIGNAL

A block signal makes available to the block diagram the value at the output of a block. The correspondence between the block characteristics and the signal card data fields is given in Table 2.8.9. Note that all block signals have a JTYPE value in the range from 1 through 21. A measured, demand, or block signal can be used as an input to a block by specifying on the block’s signal definition card the signal identification number assigned to the input signal. The signals input to each block type are combined according to the mathematical expressions given in Table 2.8.7.

Table 2.8.7 Basic Mathematical Blocks.¶
JTYPE	Block	Type	Mathematical Expression
1	summer	function	$y = g\left( g_{1}u_{1} + g_{2}u_{2} \right)$
2	multiplier	function	$y = gu_{1}u_{2}$
3	divider	function	$y = g\frac{u_{1}}{u_{2}}$
4	differentiator	function	$y = g\frac{\text{d}}{\text{dt}}u$
5	integrator	dynamic	$y = y_{0} + g\int_{0}^{t}{\text{ud}t'}$
6	lag compensator	dynamic	$y + \tau\frac{\text{d}}{\text{dt}}y = gu$ $y\left( 0 \right) = y_{0}$
7	lead-lag compensator	dynamic	$y + \tau_{1}\frac{\text{d}}{\text{dt}}y = g\left( u + \tau_{2}\frac{\text{d}}{\text{dt}}u \right)$ $y\left( 0 \right) = y_{0}$
8	function generator	table	$y = gf\left( u \right)$
9	maximum value	function	$y = \mathrm{\max}\left( u_{1},u_{2} \right)$
10	minimum value	function	$y = \mathrm{\min}\left( u_{1},u_{2} \right)$
11	time delay	function	$y = y_{0}$ $0 \leq t \leq \tau$ $y = u\left( t - \tau \right)$ $t \geq \tau$
12	natural logarithm	function	$y = \ln u$
13	exponential	function	$y = u_{1}^{u_{2}}$
14	velocity limiter	function	$y = y_{\mathrm{\text{dn}}}$ $gu < y_{\mathrm{\text{dn}}}$ $y = y_{\mathrm{\text{up}}}$ $gu > y_{\mathrm{\text{up}}}$ $y = gu$ otherwise $y_{\mathrm{\text{dn}}} = y\left( t - h \right) - hv_{\mathrm{\text{dn}}}$ $y_{\mathrm{\text{up}}} = y\left( t - h \right) + hv_{\mathrm{\text{up}}}$
15	AND	logic	$y = 1$ $u_{1} > 0,u_{2} > 0$ $y = 0$ otherwise
16	OR	logic	$y = 0$ $u_{1} \leq 0,u_{2} \leq 0$ $y = 1$ otherwise
17	NOT	logic	$y = 0$ $u \leq 0$ $y = 1$ $u > 0$
18	comparator	logic	$y = 0$ $u_{1} < u_{2}$ $y = 1$ $u_{1} \geq u_{2}$
19	sample and hold	function	$y\left( t \right) = u_{2}\left( t \right)$ $u_{1}\left( t \right) \leq 0$ $y\left( t \right) = u_{2}\left( t_{0} \right)$ $u_{1}\left( t \right) \geq 0$, $t \geq t_{0}$, where $u_{1}\left( t' \right) \leq 0$ $t' < t_{0}$
20	J-K flip flop	logic	$y^{n + 1} = Q^{n}$ $u_{1} \leq 0,u_{2} \leq 0$ $y^{n + 1} = 0$ $u_{1} > 0,u_{2} \leq 0$ $y^{n + 1} = 1$ $u_{1} \leq 0,u_{2} > 0$ $y^{n + 1} = {\overline{Q}}^{n}$ $u_{1} > 0,u_{2} > 0$
21	constant	function	$y = g$
22	sine	function	$y = g_{1}\sin\left( g_{2}u + g_{3} \right)$
23	variable lag compensator	dynamic	$y + \tau(t)\frac{d}{dt}y = gu$ $y\left( 0 \right) = y_{0}$

CONTROL SIGNALS

A control signal is used to set the value of a SAS4A/SASSYS‑1 variable equal to the value of a block signal. The correspondence between the block signal and the SAS4A/SASSYS‑1 variable and the signal card data fields is given in Table 2.8.9. Note that all control signals have a JTYPE value that ranges from -1 through -8.

END OF SIGNALS

A sequence of signal definition cards is delimited by a signal card with the ISIG field entry equal to “999”.

This card also contains flags for the binary output file print interval and control of the steady-state solution finder. First, the absolute value of the JTYPE field for the 999 card is sets the print interval for control system results output to the binary output file CONTROL.dat. Second, the J1SIG field is used to determine whether the steady-state solution finder is to be used. An entry of “1” activates the steady-state solution finder, while any other entry in this field causes the solution finder to be bypassed. (A discussion of the initial condition option is given in Section 6.4.3.) Finally, the J2SIG field allows the user to control the amount of steady-state output generated. An entry of “1” produces an extended output for trouble shooting purposes, while any other entry produces a standard output.

The JTYPE field is also used to generate an extended print-out during the transient for debugging purposes. The debug print is generated by setting the JTYPE field of the 999 card to a negative value. The print-out begins at the time specified on the F1SIG field.

DATA CARDS

A data card contains the data fields for the FORTRAN variables LOC, N, VAR1, VAR2, VAR3, VAR4, and VAR5, with the record format (2I6,5E12.5). The variables are defined in Data Card Input.

A data card appearing in the control system block has a format identical to the standard SAS4A/SASSYS‑1 data card used in other input blocks and is processed in the same way. The format information given above is the same as in the SAS manuals and is given here for completeness.

Data cards are used to construct demand tables and function generator tables, and to supply solution control parameters. These quantities and their storage locations are defined in Data Card Input.

Table 2.8.8 Data Card Format¶
Column	FORTRAN Symbol	Definition	Variable Type
1	LOC	Storage Location of VAR1	Integer
7	N	Number of Consecutive Locations	Integer
13	VAR1	Constant 1	Real
25	VAR2	Constant 2	Real
37	VAR3	Constant 3	Real
49	VAR4	Constant 4	Real
61	VAR5	Constant 5	Real

DATA CARD INPUT

CTLTAB(J,J1SIG)

1-2000

Table of normalized demand values. Dimension (20,100). Index J1SIG designates table number and J is element number in table.

CTLIM(J,J1SIG)

2001-4000

Times for CTLTAB table. Dimension (20,100).

CTLFNC(J,J1SIG)

4001-6000

Table of function generator dependent variables. Dimension (20,100).

CTLSIG(J,J1SIG)

6001-8000

Table of independent variables for CTLFNC table. Dimension (20,100).

EPSCS

8001

Convergence parameter for dynamic blocks over a subinterval.

EPSCPL

8002

Maximum relative change in a control signal over a subinterval.

SUMMARY OF CONTROL SYSTEM SIGNALS

Table 2.8.9 Signal Card Contents¶
Signal Type	Signal Variable	Card Contents
Measured	Compressible Volume Pressure, PRESL3	JTYPE = -50 J1SIG = Volume Number, ICV
Measured	Liquid Segment Flowrate, FLOWSL3	JTYPE = -51 J1SIG = Liquid Segment Number, ISGL
Measured	Liquid Cover Gas Interface Elevation, ZINTR3	JTYPE = -52 J1SIG = Volume Number, ICV
Measured	Liquid Mass, XLQMS3	JTYPE = -53 J1SIG = Volume Number, ICV
Measured	Cover Gas Volume, VOLGC3	JTYPE = -54 J1SIG = Volume Number, ICV
Measured	Time	JTYPE = -55
Measured	Pump Head, HEADP3	JTYPE = -56 J1SIG = Pump Number, IPMP
Measured	Liquid Temperature, TLQCV3	JTYPE = -57 J1SIG = Volume Number, ICV
Measured	Liquid Density, DNSCV3	JTYPE = -58 J1SIG = Volume Number, ICV
Measured	Wall Temperature, TWLCV3	JTYPE = -59 J1SIG = Volume Number, ICV J2SIG = Thick-walled node ID, optional
Measured	Cover Gas Pressure, PRESG3	JTYPE = -60 J1SIG = Volume Number, ICV
Measured	Cover Gas Mass, GASMS3	JTYPE = -61 J1SIG = Volume Number, ICV
Measured	Cover Gas Temperature, TGASC3	JTYPE = -62 J1SIG = Volume Number, ICV
Measured	Not Used.	JTYPE = -63
Measured	Liquid Segment Temperature, TSLIN3	JTYPE = -64 J1SIG = Segment Number, ISGL J2SIG = 1 (Inlet) J2SIG = 2 (Outlet)
Measured	Pump Speed, PSPED3	JTYPE = -65 J1SIG = Pump Number, IPMP
Measured	Core Channel Coolant Flowrate, CHFLO3	JTYPE = -66 J1SIG = Channel Number, ICH J2SIG = 1 (Inlet) J2SIG = 2 (Outlet)
Measured	Liquid Node Temperature, TLNOD3	JTYPE = -67 J1SIG = Node Number, INOD
Measured	Wall Node Temperature, TWNOD3	JTYPE = -68 J1SIG = Node Number, INOD
Measured	Liquid Element Temperature, TELEM	JTYPE = -69 J1SIG = Element Number, IEL J2SIG = 1 (Inlet) J2SIG = 2 (Outlet)
Measured	Not Used.	JTYPE = -70
Measured	Core Channel Outlet Temperature, CHFCOF	JTYPE = -71 J1SIG = Channel Number, ICH J2SIG = 1 (Inlet) J2SIG = 2 (Outlet)
Measured	Normalized Reactor Power, EXP(POWVA(3,1))	JTYPE = -72
Measured	Normalized Fission Power, POWFS0*AMPO	JTYPE = -73
Measured	Normalized Decay Power, Sum(POWWT(I)*POWDKH(I))	JTYPE = -74
Measured	Not Used.	JTYPE = -75,…,-82
Measured	Steam Generator Feedwater Mass Inlet Flowrate	JTYPE = -83 J2SIG = SG Number
Measured	Steam Generator Feedwater Inlet Enthalpy	JTYPE = -84 J2SIG = SG Number
Measured	Steam Generator Steam Mass Flowrate	JTYPE = -85 J2SIG = SG Number
Measured	Steam Generator Outlet Temperature	JTYPE = -86 J2SIG = SG Number
Measured	Steam Generator Steam Pressure	JTYPE = -87 J2SIG = SG Number
Measured	Steam Generator Water Level	JTYPE = -88 J2SIG = SG Number
Measured	Steam Generator Steam Outlet Enthalpy	JTYPE = -89 J2SIG = SG Number F3SIG = Initial Condition Flag F4SIG = Y_o
Demand	Demand Table	JTYPE = -90 J1SIG = Demand Table Number J2SIG = Number of Entries in Table F4SIG = Y_o
Measured	Fuel Centerline Temperature	JTYPE = -101 J1SIG = Channel Number J2SIG = MZ Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Fuel Average Temperature	JTYPE = -102 J1SIG = Channel Number J2SIG = MZ Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Fuel Surface Temperature	JTYPE = -103 J1SIG = Channel Number J2SIG = MZ Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Clad Inner Wall Temperature	JTYPE = -104 J1SIG = Channel Number J2SIG = MZ Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Clad Mid Wall Temperature	JTYPE = -105 J1SIG = Chanel Number J2SIG = MZ Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Clad Outer Wall Temperature	JTYPE = -106 J1SIG = Channel Number J2SIG = MZ Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Temperature	JTYPE = -107 J1SIG = Channel Number J2SIG = MZC Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Pressure	JTYPE = -108 J1SIG = Channel Number J2SIG = MZC Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Saturation Temperature	JTYPE = -109 J1SIG = Channel Number J2SIG = MZC Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Boiling Margin	JTYPE = -110 J1SIG = Channel Number J2SIG = MZC Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Average Temperature	JTYPE = -111 J1SIG = Channel Number J2SIG = MZC Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Structure Inner Temperature	JTYPE = -112 J1SIG = Channel Number J2SIG = MZC Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Structure Outer Temperature	JTYPE = -113 J1SIG = Channel Number J2SIG = MZC Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Reflector Inner Temperature	JTYPE = -114 J1SIG = Channel Number J2SIG = MZC Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Reflector Outer Temperature	JTYPE = -115 J1SIG = Channel Number J2SIG = MZC Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Peak Fuel Temperature	JTYPE = -116 J1SIG = Channel Number J2SIG = (Optional) If non-zero, peak fuel temperature is provided over all channels in the range J1SIG ≤ ICH ≤ J2SIG F1SIG = Scaling Factor F2SIG = Offset
Measured	Peak Clad Temperature	JTYPE = -117 J1SIG = Channel Number J2SIG = (Optional) If non-zero, peak cladding temperature is provided over all channels in the range J1SIG ≤ ICH ≤ J2SIG F1SIG = Scaling Factor F2SIG = Offset
Measured	Peak Coolant Temperature	JTYPE = -118 J1SIG = Channel Number J2SIG = (Optional) If non-zero, peak coolant temperature is provided over all channels in the range J1SIG ≤ ICH ≤ J2SIG F1SIG = Scaling Factor F2SIG = Offset
Measured	Minimum Boiling Margin	JTYPE = -119 J1SIG = Channel Number J2SIG = (Optional) If non-zero, minimum boiling margin temperature is provided over all channels in the range J1SIG ≤ ICH ≤ J2SIG F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Inlet Temperature	JTYPE = -120 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Inlet Pressure	JTYPE = -121 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Inlet Flowrate	JTYPE = -122 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Outlet Temperature	JTYPE = -123 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Outlet Pressure	JTYPE = -124 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Coolant Outlet Flowrate	JTYPE = -125 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Maximum Coolant Outlet Temperature	JTYPE = -126 F1SIG = Scaling Factor F2SIG = Offset
Measured	Minimum Coolant Outlet Temperature	JTYPE = -127 F1SIG = Scaling Factor F2SIG = Offset
Measured	Pin Bundle ΔT	JTYPE = -128 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Pin Bundle ΔP	JTYPE = -129 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Assembly Bundle ΔT	JTYPE = -130 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Assembly Bundle ΔP	JTYPE = -131 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Assembly Power	JTYPE = -132 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Pin Linear Power	JTYPE = -133 J1SIG = Channel Number J2SIG = MZ Mesh Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Peak Pin Linear Power	JTYPE = -134 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Fission Gas Plenum Temperature	JTYPE = -135 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Measured	Fission Gas Plenum Pressure	JTYPE = -136 J1SIG = Channel Number F1SIG = Scaling Factor F2SIG = Offset
Block	Summer	JTYPE = 1 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG F1SIG = g₁ F2SIG = g₂ F3SIG = g
Block	Multiplier	JTYPE = 2 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG F1SIG = g
Block	Divider	JTYPE = 3 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG F1SIG = g
Block	Differentiator	JTYPE = 4 J1SIG = Input Signal 1, ISIG F1SIG = g
Block	Integrator	JTYPE = 5 J1SIG = Input Signal 1, ISIG F1SIG = g F3SIG = Initial Condition Flag F4SIG = Y₀ F5SIG = E_z (Zero Crossing Parameter)
Block	Lag Compensator	JTYPE = 6 J1SIG = Input Signal 1, ISIG F1SIG = g F2SIG = Tau F4SIG = Y₀ (Not used when J1SIG(999) = 1) F5SIG = E_z (Zero Crossing Parameter)
Block	Lead - Lag Compensator	JTYPE = 7 J1SIG = Input Signal 1, ISIG F1SIG = g F2SIG = $\mathrm{\tau}$₁ F3SIG = $\mathrm{\tau}$₂ F4SIG = Y₀Y_o (Not used when J1SIG(999) = 1) F5SIG = E_z (Zero Crossing Parameter)
Block	Function Generator	JTYPE = 8 J1SIG = Input Signal 1, ISIG J2SIG = Function Generator Table Number F1SIG = g
Block	Maximum	JTYPE = 9 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG
Block	Minimum	JTYPE = 10 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG
Block	Time Delay	JTYPE = 11 J1SIG = Input Signal 1, ISIG F1SIG = $\mathrm{\tau}$ F4SIG = Y₀ (Not used when J1SIG(999) = 1)
Block	Natural Logarithm	JTYPE = 12 J1SIG = Input Signal 1, ISIG F1SIG = g
Block	Exponentation	JTYPE = 13 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG F1SIG = g
Block	Velocity Limiter	JTYPE = 14 J1SIG = Input Signal 1, ISIG F1SIG = V_down F2SIG = V_up F3SIG = g
Block	AND	JTYPE = 15 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG
Block	OR	JTYPE = 16 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG
Block	NOT	JTYPE = 17 J1SIG = Input Signal 1, ISIG
Block	Comparator	JTYPE = 18 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG
Block	Sample and Hold	JTYPE = 19 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG
Block	JK Flip-Flop	JTYPE = 20 J1SIG = Input Signal 1, ISIG J2SIG = Input Signal 2, ISIG F4SIG = Q₀
Block	Constant	JTYPE = 21 F1SIG = g
Block	Sine Function	JTYPE = 22 J1SIG = Input Signal 1, ISIG F1SIG = g1 F2SIG = g2 F3SIG = g3
Block	Variable Lag Compensator	JTYPE = 23 J1SIG = Input Signal 1, ISIG (u) J2SIG = Input Signal 2, ISIG (Tau) F1SIG = g F4SIG = Y₀ (Not used when J1SIG(999) = 1) F5SIG = E_z (Zero Crossing Parameter)
Control	Reactivity, $	JTYPE = -1 J1SIG = Signal Number Used F5SIG = E_z (Zero Crossing Parameter)
Control	Normalized Pump Motor Torque	JTYPE = -2 J1SIG = Signal Number Used J2SIG = Pump Number F5SIG = E_z (Zero Crossing Parameter)
Control	Steam Generator Feedwater Mass Flowrate	JTYPE = -3 J1SIG = Signal Number Used J2SIG = Steam Generator Number F5SIG = E_z (Zero Crossing Parameter)
Control	Steam Generator Feedwater Enthalpy	JTYPE = -4 J1SIG = Signal Number Used J2SIG = Steam Generator Number F5SIG = E_z (Zero Crossing Parameter)
Control	Steam Generator Steam Mass Flowrate	JTYPE = -5 J1SIG = Signal Number Used J2SIG = Steam Generator Number F5SIG = E_z (Zero Crossing Parameter)
Control	Sodium Valve Loss Coefficient	JTYPE = -6 J1SIG = Signal Number Used J2SIG = Valve Number F5SIG = E_z (Zero Crossing Parameter)
Control	Steam Generator Steam Pressure	JTYPE = -7 J1SIG = Signal Number Used J2SIG = Steam Generator Number F5SIG = E_z (Zero Crossing Parameter)
Control	Air Dump Heat Exchanger Air Mass Flowrate	JTYPE = -8 J1SIG = Signal Number Used J2SIG = Air Dump Heat Exchanger Number F5SIG = E_z (Zero Crossing Parameter)