2.8.2.5. Block 11 — OPCIN — Channel-Independent Floating-Point Input

EPSTEM

1

K

Steady-state temperature convergence delta. The steady-state temperatures in the fuel-pin must converge such that |T’ - T| <= EPSTEM, where T’ is the temperature on the last iteration and T is the temperature on the previous iteration.

Suggested value: 0.1.

EPSREA

2

Not currently used.

EPSPOW

3

Neutron flux amplitude convergence criterion.

EPSGAM

4

Not currently used.

DT0

5

s

Initial and maximum main time step length.

DTMXB

6

s

Maximum heat-transfer time step length after coolant boiling inception.

Suggested value: 0.01 s.

Maximum value: 0.02 s.

TIMAX

7

s

Maximum problem time. Restart file is saved when time TIMAX is reached if NSTEP> 0.

REAITR

8

Not currently used.

TCOSTP

9

s

Number of CPU seconds reserved at end of run for writing of restart file when NSTEP > 0.

DTFUEL

10

K

Maximum fuel temperature change per heat-transfer time step.

Suggested value: 50.0 for IMETAL = 0,

5.0 for IMETAL > 0.

DTCLAD

11

K

Maximum cladding temperature change per heat-transfer time step.

Suggested value: 30.0.

TCLMAX

12

Not currently used.

DTP0

13

s

Initial PRIMAR time step size.

DTPMAX

14

s

Maximum PRIMAR time step size before boiling starts.

DTPBOI

15

s

Maximum PRIMAR step size after start of boiling.

DTPLEV

16

s

Maximum PRIMAR step size after LEVITATE starts.

DTPFCI

17

s

Maximum PRIMAR step size after PLUTO-2 starts.

TPRFCI

18

s

Time after PLUTO-2 initiation when PRIMAR step can be increased to DTPBOI.

DPINMX

19

Pa

Maximum change in inlet pressure per PRIMAR step.

DTINMX

20

K

Maximum change in inlet temperature per PRIMAR step.

DTMMXB

21

s

Maximum main time step after the onset of boiling.

DPWMAX

22

Maximum fractional change in power per main time step, only used if IPOWER= 1.

ASCRAM

23

Not currently used.

PSCRAM

24

Normalized total power for scram initiation.

Relevant for IPOWER=0, NPK=0.

GSCRAM

25

Not currently used.

DTSSCP

26

s

Time step size for the null transient to initialize component-component heat transfer in PRIMAR-4.

EPSSCP

27

Component-component heat transfer convergence criterion for the null transient.

DXMAPR

28-87

Not currently used.

DTNULL

88

s

Time step size for the null transient for steady-state core channel thermal hydraulics.

Not used if ISSNUL=0.

TPCOST

89

s

Time to start writing PINACLE data for core image (PNPICO subroutine).

TPCOLE

90

s

Time to start writing LEVITATE data for core image (LEPICO subroutine).

TPCOEN

91

s

Time to stop writing data for core images.

DTPICP

92

s

Time interval for writing data for core images while PINACLE is active.

DTPICL

93

s

Time interval for writing data for core images while LEVITATE is active.

DTMMAX

94

s

Maximum main time step length. Default = DT0.

DTMIN (I)

95-104

s

Main time step table. DTMIN(I) is the length of the main time step to be used in the problem time interval from TDTMIN(I) to TDTMIN(I+1). For times before TDTMIN(1), DT0 is used as the main time step. If J is the index of the last entry in the DTMIN table, then the main time step for times after TDTMIN(J) is DTMIN(J). If there are no entries in the DTMIN table, the automatic main time step selection algorithm will be used.

TDTMIN (I)

105-114

s

See DTMIN above.

TMAINS

115-149

s

Problem times for forced main time step termination.

DELSCR

150

s

Time delay after scram initiation (ASCRAM, PSCRAM, GSCRAM) for scram reactivity table (SCRTAB, SCRTME) application and for external source (KQSCRA) changes.

DELPUM

151

s

Time delay after scram initiation (ASCRAM, PSCRAM, GSCRAM) for beginning of PUHALF pump coastdown.

PUHALF

152

s

Flow halving time after TSCRAM+DELPUM.

F(t)=F(0)/(1+t/PUHALF), where t is the time after TSCRAM+DELPUM. Only for IFLOW > 0.

OPCDUM

153

Not currently used.

GRAVITY

154

m/s^2

Acceleration of gravity. Default: 9.81 m/s^2

ADJKTOL

155

Steady state initialization adjustment tolerance for internal loss coefficients. Internal loss coefficients are defined in XKORI for core channels and G2PRDR for elements. Must be greater than or equal to zero. Default: 0.0

When 0.0, the adjustment is unconstrained.

OPCDUM

156-250

Not currently used.

DEFAULT VALUES

DTP0	1.0
DTPBOI	0.01
DTPLEV	0.004
DTPFCI	0.001
TPRFCI	0.05
DPINMX	25000.0
DTINMX	5.0
DTPMAX	1.0
DTMMXB	0.02