re lap 5 class slides

THERMAL HYDRAULICS SIMULATION

IRC

Motivation

• Why Simulation ?• We need to know more about the Reactor

Plant (PWR, BWR, Research) behavior under normal and accidental conditions.

• Can not do every experiment on actual reactors --- why?

• Experimental mockups --- limited use.• Computer simulation is the only choice for

large complex systems.

Objectives of Module

• Learn the underlying mathematical models for TH modeling.

• Select and focus on a computer code RELAP5• Learn the basics of RELAP5 to– Understand existing TH models – Make small changes in existing TH models

• This module does not cover ALL features of RELAP5

Options for Computer Codes

• Many TH codes available – conservative and best estimate codes

• Varying capabilities and applications1. RELAP5 --- PWR, BWR2. COBRA --- Rod Bundle (PWR)3. TRAC 4. CONTAIN5. Etc.

Choosing Relap5

• RELAP5 is the most widely used systems TH code in the world

• Accepted by IAEA for Reactor Safety Analyses studies

• Models of most practical systems are already available (e.g. PWRs, Res. Reac.)

• Large user community• Extensive references• Widely accepted mathematical models

Reactor Excursion and Leak Analysis Program

RELAP

IRC

Basic Equations for Thermal Hydraulics

• 1-D , 2-Phase Non-Equilibrium Transient equations are solved:– Continuity Equations for each phase– Momentum Equations for each phase– Energy Equations for each phase– (Almost in the same form as given in Kazimi but for 1D)

• The 8 independent field variables solved are: – Pressure, P– Specific Internal Energies of Phases: ug, uf

– Phasic Velocities (1D): vg, vf– Void Fraction: α– Non-Condensable Quality: Xn

– Boron Density: ρb

• A number of State Relationships, Constitutive Models and Physical Property data is available in the RELAP5 Code (See Volume-1 of Code Manual for these equations)

Two Fluid modelContinuity Equation

• We have seen the governing equations of two fluid model.

• The Continuity Equations are:

– Interfacial Mass Transfer Conditions:

Momentum Equation

• Momentum Equations:

Energy Equations

User guidelines manuals and supplement give basics

• RELAP5 (only) - Vols. I, II and V• SCDAP/RELAP5 - Vol. III• Detailed input – Appendix A (R5 vol II, SR5 vol III)– Appendix A (RSIM HTML)

• Supplemental input manual for RELAP/SCDAPSIM

Running RELAP5

• Mod3.2– relap5 -i [file.i] -o [file.o] -r [file.r]– file.i - input file name (default - indta)– file.o - output file name (default - outdta)– file.r - restart plot file name (default - rstplt)– -s [file.s] strip/extract output file [default - stripf]

Running RELAP5

• Mod3.3 onwards– From command line– Run relap-loader.bat – A GUI will be opened to assist file specs

The Modular Structure

RELAP5 INPUT STRUCTURE

• Typical input file includes– Hydrodynamic component data– Heat structure data– Trip logic and control system data– Reactor kinetics data– General table data– Plot request data

INPUT CARD NUMBERS

• (Case) Control options (100-199)• Time step options (200-299)• Minor edits (301-399)• Trips (400-799 and 20600000-20620000)• Hydrodynamic components (CCCXXNN)

INPUT CARD NUMBERS

• Heat structures (1CCCGXNN)• Heat structure thermal properties

(201MMMnn)• General tables (202TTTNN)• Kinetics (30000000-3099999)• Control Systems (20500000)

A Simple Problem

• Consider flow of water through a vertical pipe between two tanks.

• The process involves few “Hydrodynamic Components”.

• The Input File should contain all information required to solve the problem

A Simple Problem

• 25 foot long vertical pipe• 1 sq. ft. flow area• Water• Sink pressure - 50. Psia• Source pressure - 150 Psia• Temperature - 120 o F

Schematic Diagram

Sink Vessel 50 psia

Source Vessel 150 psia

Vertical Pipe25 ft

Nodalization

• A schematic representation of Process Flow Diagram for the purpose of:

– Component identification– Flow sequence development– 1D Discretization

Nodalization Diagram

Source

Sink

Pipe

Junction

Junction

Input File Startup

• These Starting Cards are needed for each file:– Card 100 Problem-Type Options• Format: 100 W1 W2

– W1: Problem Type (NE, RESTART, PLOT etc)– W2: Options (STDY-ST, TRANSNT etc.)

• Example: 100 new transnt

Input File Startup

– Card 101 Input Check or Run• This card is optional. Controls whether to check Input File

or not

– Card 102 Unit Control• Format: 102 W1 W2

– W1: Input Unit system– W2: Output Unit system– BRITISH and SI are supported W’s

• Example: 102 british si

Input File Startup

– Card 103 is Restart Plot Input Control– This card is required for Non-NEW Cases– Card 104 is Restart Plot File Control– This card is optional

Input File Startup

– Card 105 CPU Time Remaining and Diagnostic Edit Card

– This card is optional• Format: 105 W1 W2 W3 W4 W5

– W1(R) CPU remaining limit 1 (s).– W2(R) CPU remaining limit 2 (s).– W3(R) CPU time allocated (s). This quantity is optional.– W4(I) Debug control word (Optional)– W5(I) Debug control word (Optional)

• Example: 105 10.0 40.0 200.0

Input File Startup

• Card 110 Noncondensible Gas Species– Specifications of Noncondensible gases (Optional)– A Maximum of 5 out of following Species can be entered:

• argon, helium, hydrogen, nitrogen, xenon, krypton, air – Format: 110 W1 W2 …… Wn

• Card 115 Noncondensible Mass Fractions– Must Follow Card 110 – Format 115 W1 W2 ……. Wn

• Example: • 110 air• 115 1.0

Input File Startup

– Cards 201 through 299, Time Step Control – At least one of these cards is required for NEW problems

• Format: 201 W1 W2 W3 W4 W5 W6 W7– W1 (R): Time End (seconds)– W2 (R): Minimum Time Step (Any +ve number < 1 e -06)– W3 (R): Maximum (or Requested) Time Step – W4 : Packed word ssdtt for output control ( 3 is recommended see details

in manuals)– Words 5, 6, and 7 specify the minor, major, and restart edit frequencies as

integer multiples of the maximum time step size

• Example: 201 20.0 1e-06 0.05 3 1 50 2000

Input File Startup

– CARDS 20300nnm• PLOT REQUEST INPUT DATA

– Format: 20300nnm W1 W2 W3– nn: Graph ID number 1 -99 (A max of 40 graphs can be printed at a time)– m: set of variables to be plotted on the same graph (0-4)– W1: Alphanumeric part of variable name (see list in Section A4 App)– W2: Parameter part of variable name.– W3: Axis number and linear/logarithmic scale indicator

( -2,-1,0,1,2)

– Example: 20300011 mflowj 120000000 120300012 mflowj 127000000 1

Input FileHydrodynamic Components

– Various Hydrodynamic Components can be Modeled:• Single-Volume Component • Time-Dependent Volume Component• Single-Junction Component• Time-Dependent Junction Component• Pipe/Annulus Component• Branch, Separator, Jet-mixer, Turbine, and ECC-Mixer Components• Valve Component• Pump Component• Multiple-Junction Component • Accumulator Component

Input FileHydrodynamic Components

• Input Requirements for Hydrodynamics– all flow areas and volumes– vertical orientations– hydraulic diameters (or equiv. Information)– flow loss geometries (or test or plant data)– initial conditions (or estimates for ss calc.)

Input File Hydrodynamic Components

– General Format: CCCXXNN• CCC: Component ID number• XX: Card Type• NN: Card number within Card Type

– Starting Card CCC0000– Format: CCC0000 W1 W2

• This Card is required to “introduce” every Hydro-Component• CCC is the component ID • W1: 8 character component name in quotes (“abcdefgh”)• W2: Component Type (SNGLVOL, TMDPVOL, SNGLJUN, TMDPJUN, PIPE,

ANNULUS, BRANCH, SEPARATR, JETMIXER, TURBINE, ECCMIX, VALVE, PUMP, ACCUM, DELETE)

– Example: • 1100000 "source" tmdpvol• 1200000 "sngljuni" sngljun• 1250000 "stmpipe" pipe

Input File Hydrodynamic Components

– Single-Volume SNGLVOL (CCC0101 through CCC0109)• SNGLVOL’s are most basic volume component.• Not used frequently• Details are same as for Time Dependant Volume

– Time Dependant Volume TMDPVOL (CCC0101 through CCC0109)• Time-dependent volume must be used wherever fluid can

enter or leave the system being simulated.• Geometric information same as for single volume

Hydrodynamic Component TMDPVOL

• Format: CCC0000 “name” TMDPVOL

• Format: CCC0101 W1 W2 … W9– W1(R) Volume flow area (m 2 , ft 2 ).– W2(R) Length of volume (m, ft).– W3(R) Volume of volume (m 3 , ft 3 ). The program requires that

the volume equals the volume flow area times the length (W3 = W1·W2).

– W4(R) Azimuthal angle (degrees). (< 360 degrees.) For possible drawing of nodalization diagrams.

– W5(R) Inclination angle (degrees). (The absolute value of this angle must be < 90 degrees with an upward inclination, i.e., the inlet is at the lowest elevation. This angle is used in the interphase drag calculation.

– W6(R) Elevation change (m, ft).

• Cyl & Spherical Coord. System

Cylinder Sphere


CCC0101 continued – W7(R): Wall roughness (m, ft).– W8(R): Hydraulic diameter (m, ft). – W9(I) : Volume control flags. Packed format “tlpvbfe”

• t: Thermal front tracking model is to be used; t = 0 or 1• l: Mixture level tracking model is to be used; l = 0 or 1• p: Water packing scheme is to be used. p = 0 or 1• v: vertical stratification model is to be used. v = 0 or 1• b: interphase friction that is used. b = 0 or 1• f: wall friction is to be computed. f = 0 or 1• e: nonequilibrium or equilibrium is to be used. e = 0 (nonequilibrium, unequal

temperature) e = 1 (equilibrium, equal temperature) – Example: – * fa l vol azi vert dz rough hyd d flags– 1100101 20.0 0.0 1.0e6 0.0 -90.0 -5.0e4 0.0 0.0 0000000


The Azimuthal & Inclination Angles


– CCC02NN Initial Conditions Cards– CCC0200 ebt (Control Card)• e = 0 (default fluid); 1 (H20); 2 (D2O)• b = 0 means no boron• t determines how CCC0201 to CCC0209 will be entered• t = 0 to 3 means only one component (water / steam)

t = 4 to 6 means more than one components (water / steam & noncondensibles)


– If t = 0, the next four words are interpreted as pressure (Pa, lb f /in 2), liquid specific internal energy (J/kg, Btu/lb), vapor specific internal energy (J/kg, Btu/lb), and vapor void fraction all in non-equilibrium conditions.

– If t = 1, the next two words are interpreted as temperature (K, o F) and static quality in equilibrium condition.

– If t = 2, the next two words are interpreted as pressure (Pa, lb f /in 2 ) and quality in equilibrium condition.

– If t = 3, the next two words are interpreted as pressure (Pa, lb f /in 2 ) and temperature (K, o F) equilibrium condition.

– (See Manual For Detail about noncondensible)


• CCC0201 to CCC0299 TMDPVOL Data Cards• Format: CCC02NN W1, W2 .. W7– W1: Search Variable (e.g. Time)

Could be some other time dependant variable

– W2 .. W7: Variable Values according to the value of t in Card CCC0200


• Example

** steam inlet volume0010000 “srcv1” tmdpvol* fa len vol a-ang v-ang dz rou Hyd flag0010101 1.0e-1 1.0 0.0 0.0 0.0 0.0 4.e-5 0.0 00* Initial Conditions0010200 003*CCC0201 Time P T 0010201 0.0 2.2e5 750.00010202 3420.0 2.2e5 750.00010203 3540.0 2.2e5 750.00010207 6000.0 2.2e5 443.0


• Another simple example, a TMDPVOL that is to represent a constant pressure atmospheric containment boundary condition for a LOCA simulation. Assume that no reverse flow from the containment to the coolant system is anticipated, such as would be the case for a small break.

• For this purpose, TMDPVOL 580 may be input as follows:

*hydro name type5800000 "contain" tmdpvol*hydro area length volume horiz vert elev rough dh flags5800101 1.e6 0. 1.e6 0. 0. 0. 0. 0. 00010*hydro ebt trip alphacode numericcode5800200 003*hydro time pressure temp5800201 0. 14.7 213.

Hydrodynamic Component Single junctions (SNGLJUN)

• Basic hydrodynamic flow unit used to Join two Hydro Components• Information needed for junction card

– “From” volume– “To” volume– Forward and reverse loss coefficients– Models to be used– Initial liquid and vapor velocities or mass flows

• Models that can be selected include– counter current flow– horizontal stratification– choking– area changes - (smooth or abrupt)– momentum equation needed– crossflow


• CCC0000 “name” SNGLJUN• CCC0101 .. CCC0109 are Junction Geometry Cards

• Format: CCC010N W1 .. W9– W1(I):• FROM connection code to a component. • CCC000000 if the connection is to the inlet side of the component• CCC010000 if the connection is to the outlet side of the

component• (CCC in the above two numbers belong to the component

connected)– W2(I): • TO connection code to a component (same format as

for FROM).


– W3(R): • Junction area (m 2 , ft 2 ). If zero, the area is set to the

minimum of the volume flow areas of the adjoining volumes.

– W4(R): • Reynolds number independent forward flow energy

loss coefficient

– W5(R):• Reynolds number independent reverse flow energy loss

coefficient


– W6(I):• Junction control flags. Packed format “jefvcahs”

– j specifies that this junction is a jet junction. – e specifies the modified PV term in the energy equations. e = 0 not app. – f specifies CCFL options. f = 0 means that the CCFL model will not be applied– v specifies horizontal stratification entrainment / pullthrough options– c specifies choking options. c = 0 means that the choking model will be applied– a specifies area change options

» a = 0 means either a smooth area change or no area change» a = 1 means full abrupt area change» a = 2 means partial abrupt area change

– h specifies non-homogeneous or homogeneous. h = 0 means non-homogeneous h = 2 specifies the homogeneous

– s specifies momentum flux options. » s = 0 uses momentum flux in both the TO and FROM volumes» s = 1 uses momentum flux in the FROM volume only » s = 2 uses momentum flux in the TO volume only » s = 3 does not use momentum flux in either volumes


– W7(R)• Subcooled discharge coefficient. This quantity is applied only to

subcooled liquid choked flow calculations. • 0.0 < W7 <= 2.0 • If W7, W8, and W9 are missing, all are set equal to 1.0.

– W8(R) • Two-phase discharge coefficient. This quantity is applied only to two-

phase choked flow calculations. • 0.0 < W8 <= 2.0 • If W8 is missing then W8 and W9 are set to 1.0.

– W9(R) • Superheated discharge coefficient. This quantity is applied only to

superheated vapor choked flow calculations. • 0.0 < W9 <= 2.0 • If W7 and W8 are entered and W9 is missing then it is set to 1.0


• CCC0110 – Optional – To Specify junction Hydraulic Diameter and CCFL

phenomenon– See details in manuals

• CCC0111– Junction Form Loss Data


• CCC0201– SNGLJUN Initial Conditions– Format: CCC0201 W1 …. W4

• W1: – If W1 = 0, W2 and W3 are velocities of Liquid & Vap.– If W1 = 1, W2 = Mass flow rates

• W2:– Velocity of Liquid (m/s or ft/s) or Mass Flow Rate of Liquid

• W3: – Velocity of Vapor or Mass Flow Rate of Vapor

• W4:– Interface Velocity (Enter 0.0) (This value is not currently used by the

code)

SNGLJUN Cards Summary

• CCC0000 Definition (Required)• CCC010N Geometry Cards (Required)• CCC0110 Hyd. Dia & CCFL (Optional)• CCC0111 Form Loss (Optional)• CCC0201 Initial Conditions (Required)


Example:1210000 “testj1” sngljun From vol To vol Area f. loss r. loss flag

1210101 021010000 022000000 0.0 0.0 0.0 010001210201 1 0.0 1.60e-2

Example:1200000 "sngljuni" sngljun* From vol To vol Area f. loss r. loss flag1200101 110010002 125010001 0.1 0.0 0.0 0000100* flag liq mass flow vap mass flow inter. veloc. 1200201 1 0.0 0.0 0.0

Hydrodynamic Component Pipe / Annulus (PIPE / ANNULUS)

• The PIPE and ANNULUS components are exactly same except that the ANNULUS component must be vertical and all the water is in the film (i.e., no drops) when in the annular-mist flow regime.

• All inputs are essentially the same for PIPE as well as ANNULUS

• A PIPE is simply a series of Single Volumes connected through Single Junctions.

• More than one junction may be connected to the inlet or outlet.

• If an end has no junctions, that end is considered a closed end.


• CCC0000 “name” PIPE• CCC0001: Pipe Discretization Info – Format: CCC0001 nv

• nv is the number of volumes in which Pipe has been discretiszed • 1 <= nv <= 99

• CCC0101 .. CCC0199: – Pipe x-coordinate Volume Flow Areas– Format: CCC01NN W1 W2 ….

• The W1 and W2 are data pairs entered in a Sequential Expansion Format


– W1 Volume flow area (m 2 , ft 2 ).– W2 Volume number

• Sequential Expansion Format (SEF)– This format consists of sets of data– Each set containing one or more data items followed by an

integer– Example:

• 11100101 0.1 3 0.15 3 .25 2• Means for PIPE 111 the Flow Areas for the first 3 volumes is 0.1 for

next 3 volumes it is 0.15 and for the next 2 volumes it is 0.25

0.1 0.10.1 0.15 0.150.15 0.25 0.25

1 2 3 4 5 6 7 8


• CCC0201 … CCC0299– Pipe Junction Flow Areas– Optional Cards– These are used to specify flow areas of internal junctions

• CCC0301 … CCC0399– Pipe X-Coordinate Volume Lengths– Format: CCC03NN W1 W2 …

• W1 and W2 are data pairs in SE Format• Example: 1110301 40 3 25 2 50 3


• CCC0401 … CCC0499– Pipe-Volume Volumes– Format: CCC04NN W1 W2 …• W1 and W2 are data pairs in SEF• If these cards are missing (or are set as 0.0) Volumes

are calculated from flow areas * length

• CCC0501 … CCC0599– Pipe-Volume Azimuthal Angles – Optional (SE Format)


• CCC0601 … CCC0699– Pipe-Volume Vertical Angles– Angles are in degrees between +- 90– SE Format

• CCC0701 … CCC0799– Pipe X-Coordinate Elevation Changes– Optional – If these cards are missing Elevation is calculated from the

Length and Angles data– SE Format


• CCC0801 … CCC0899– Pipe-Volume X-Coordinate Friction Data– Format: CCC0801 W1 W2 W3 …• Three Word SEF• W1: Roughness• W2: Hydraulic Dia• W3: Number of Volumes

– Example: • 1110801 0.002 0.1 3 0.002 0.15 2


• CCC0901 … CCC0999– Pipe Internal Junction Loss Coefficients– Optional– If missing – no junction loss– Format: CCC0901 W1 W2 W3 …• Three Word SEF• W1: Forward Loss Coefficient• W2: Reverse Loss Coefficient• W3: Number of Junctions


• CCC1001 … CCC1099– Pipe-Volume X-Coordinate Control Flags– Packed word “tlpvbfe” in a Two Word SEF– Flags have the same meaning as that for SNGLVOL or

TMDPVOL

• CCC1001 … CCC1099– Pipe-Junction X-Coordinate Control Flags– Packed word “efvcahs” in a Two Word SEF– Flags have the same meaning as that for SNGLJUN


• CCC1201 … CCC1299– Pipe-Volume Initial Conditions– Format: CCC1201 W1 W2 .. W7• Seven Word SE Format• W1: ebt (Packed Word)

– e: Fluid ---- 0 = Default; 1 = H2O; 2 = D2O– b: Boron Presence; 0 = No; 1 = Yes– t: Specifies the next 5 words

» = 1: Equilibrium -- W2 = T, W3 = x, W4 – W6 = 0.0

» = 2: Equilibrium -- W2 = P, W3 = ul , W4 = uf , W5 = , W6 = 0.0


• = 3: Equilibrium -- W2 = P, W3 = T , W4 = W5 = W6 = 0.0• t = 4 to 6 for non-condensable only (See Detail in Manual)

– W7: Number of Volumes

• CCC2001 … CCC2099– Pipe Initial Boron Concentrations– Format: CCC20NN W1 W2 ..• Two Word SEF• W1 = Boron Concentration• W2 = Volume Number


• CCC1300– Pipe Junction Conditions Control Words– Optional – If missing then velocities are assumed on Cards CCC1301 through

CCC1399.– Format: CCC1300 W1

• W1 = 0 -- Cards CCC 13NN specify velocities• W1 = 1 – Cards CCC13NN specify Flow Rates

• CCC1301 through CCC1399– Pipe Junction Initial Conditions

• Three Word SEF• W1 = Initial velocity or mass flow for Liquid• W2 = Initial velocity or mass flow for Vapor• W3 = Interface velocity (Enter 0.0) • W4 = Junction number


• CCC1401 … CCC1499– Pipe Junction Diameter and CCFL Data Cards– Optional – If missing, default values are used– Same parameters as for SNGLJUN but in a Five Word SEF

• CCC3001 … CCC3099– Pipe Junction Form Loss Data Card– Optional – If missing the Junction Loss data is used from

Cards CCC09NN– Same parameters as for SNGLJUN but in a Five Word SEF

Hydrodynamic Component PIPE / ANNULUS Summary of Cards

• CCC0000 Name and Initialize• CCC0001 Discretization • CCC0101 … CCC0199 X-Coordinate Volume Flow Areas• CCC0201 … CCC0299 Junction Flow Areas• CCC0301 … CCC0399 X-Coordinate Volume Lengths• CCC0401 … CCC0499 Volume Volumes• CCC0501 … CCC0599 Volume Azimuthal Angles • CCC0601 … CCC0699 Volume Vertical Angles • CCC0701 … CCC0799 X-Coordinate (Elevation) Changes • CCC0801 … CCC0899 Volume X-Coordinate Friction Data • CCC0901 … CCC0999 Junction Loss Coefficients • CCC1001 … CCC1099 Volume X-Coordinate Control Flags • CCC1101 … CCC1199 Junction Control Flags • CCC1201 … CCC1299 Volume Initial Conditions • CCC2001 … CCC2099 Initial Boron Concentrations • CCC1300 Junction Conditions Control Words • CCC1301 … CCC1399 Junction Initial Conditions • CCC1401 … CCC1499 Junction Diameter and CCFL Data Cards • CCC3001 … CCC3099 Junction Form Loss Data Card

Hydrodynamic Component Valve Junction (VALVE)

• The valve component provides a general capability for specifying a junction with a variable flow area.

• Other properties are Same• CCC0000 “name” VALVE• CCC0101 … CCC0109– Valve Junction Geometry Cards– Format is same as that for SNGLJUN

• CCC0110– Valve Junction Diameter and CCFL Data Card– Same as for SNGLJUN


• CCC0111– Valve Junction Form Loss Data Card– Same as for SNGLJUN

• CCC0201– Valve Junction Initial Conditions– Same as for SNGLJUN

• CCC0300– Valve Type Card– Format: CCC0300 W1

• W1: Type of Valve (Either of the following)– CHKVLV : for a check valve– TRPVLV for a trip valve– INRVLV for an inertial swing check valve– MTRVLV for a motor valve– SRVVLV for a servo valve– RLFVLV for a relief valve


• CCC0301 … CCC0399– Valve Data and Initial Conditions– Format: CCC03NN W1 … W12

• W1 … W12 : These depend on type of valve • (See Manual for detail)

• CCC0400 … CCC0499– Valve CSUBV Table– Only for Servo and Motorized Valves– These essentially contain the smooth area change data

• CCC0400– Factors for flow area and stem position– Optional. The factors apply to the flow area or the stem– Format: CCC0400 W1 W2

• W1: Normalized flow area or normalized stem position• W2: Flow coefficient factor

Heat Structures• Heat Structures are used to represent metal structures such as vessel walls, steam

generator tubes, fuel rods and reactor vessel internals in a model.

• Temperature distributions are found by a one-dimensional transient heat conduction equation with source in rectangular, cylindrical, or spherical coordinates.

• Each heat structure is defined to have a “left” side and a “right” side. • Each side of a heat structure may be connected to at most one hydrodynamic

volume. However, more than one heat structures may be connected to the same hydrodynamic volume.

• The average fluid conditions in the hydrodynamic volume are assumed to interact with the entire heat structure (i.e. plug flow) except under stratified flow conditions.

Heat Structures

Simple Heat Structure Attached toHydrodynamic Volume

HydrodynamicVolumeHeat Structure

Discretization

A composit Heat Structure with differentgeometries

HEAT STRUCTURES Input Requirements

• Heat structures (RELAP 1D)– dimensions – material type– thermal properties as functions of temp.– heater power and distribution (if any)– surface roughness (for hydro)– initial temperatures (or estimates for ss calc.)

Heat Structures

• 1CCCG000– General Heat Structure Data• 1: To distinguish Heat Structure from Hydro Comp• CCC: Heat Structure ID

– Practice is to use the same number as that for Hydro Comp attached

• G: Geometry Number (Their may be more than one materials, thicknesses etc.)• 000: Other Cards Numbers

– Format 1CCCG000 W1 .. W8

Heat Structures– W1: Number of axial heat structures with this geometry nh.

• 0 < nh < nh– W2: Number of radial mesh points for this geometry, np– W3: Geometry type. Enter 1 for rectangular, 2 for cylindrical, and 3 for

spherical. – W4: Steady-state initialization flag. – W5: Left boundary coordinate – W6: Reflood condition flag. – W7: Boundary volume indicator– W8: Maximum number of axial intervals. Enter 2, 4, 8, 16, 32, 64, or

128 to indicate the maximum number of axial subdivisions

Heat Structures

• Card 1CCCG100– Heat Structure Mesh Flags– Format 1CCC100 W1 W2• W1: Mesh Location Flag• W2: Mesh Format Flag

• Cards 1CCCG301 … 1CCCG399– Heat Structure Source Distribution Data (Radial)– Format: 1CCCG3NN W1 W2

• Two Word SE Format

Heat Structures

• 1CCCG401 … 1CCCG499– Initial Temperature Data

• 1CCCG501 … 1CCCG599– Left Boundary Condition Cards

• 1CCCG601 … 1CCCG699– Right Boundary Condition Cards

• 1CCCG701 … 1CCCG799– Source Data Cards

Simple PROBLEM 1

• 25 foot long vertical pipe• 1 sq. ft. flow area• Water• Sink pressure - 50. Psia• Source pressure - 150 Psia• Temperature - 120 o F

Simple PROBLEM 2

• Add 1.0 inch pipe wall• Initial temperatures is 50.0 deg F

Simple PROBLEM Revisit

RELAP PROBLEM Revisit

• Add a control system to integrate the flow from the pipe to the sink

• Output the result as a minor edit• Add the result to the quick plot request

8

7

6

5 4

3

2

1

CCC Pipe Steam GeneratorTube Primaries – lumpedtogether

Heat Structures – structuralTube material

Outlet Plenum

Inlet Plenum

Reactor Vessel

To Surge LineTo Pressurizer

1

2

3 4 5

123

Pump Suction to cold leg

PumpTo cold leg

Pipe

Branches

AccumulatorHPI

LPI

Nodalization ofPrimary CoolantPump

Horizontal section – allowsthe formation of stratified flowat bottom of loop seal

The two branches and pipe between the pump andcold leg also allow the simulationof horizontal stratification

U-Tube Steam Generator

Pressurizer

Containment

To Steam Generator

Surge Line

From Reactor Vessel

441

440

444 445

443

400 402

re lap 5 class slides

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