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

1

EPSTEM

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.

2

EPSREA

Not currently used.

3

EPSPOW

Neutron flux amplitude convergence criterion.

4

EPSGAM

Not currently used.

5

DT0

s

Initial and maximum main time step length.

6

DTMXB

s

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

Suggested value: 0.01 s.

Maximum value: 0.02 s.

7

TIMAX

s

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

8

REAITR

Not currently used.

9

TCOSTP

s

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

10

DTFUEL

K

Maximum fuel temperature change per heat-transfer time step.

Suggested value: 50.0 for IMETAL = 0,

5.0 for IMETAL > 0.

11

DTCLAD

K

Maximum cladding temperature change per heat-transfer time step.

Suggested value: 30.0.

12

TCLMAX

Not currently used.

13

DTP0

s

Initial PRIMAR time step size.

14

DTPMAX

s

Maximum PRIMAR time step size before boiling starts.

15

DTPBOI

s

Maximum PRIMAR step size after start of boiling.

16

DTPLEV

s

Maximum PRIMAR step size after LEVITATE starts.

17

DTPFCI

s

Maximum PRIMAR step size after PLUTO-2 starts.

18

TPRFCI

s

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

19

DPINMX

Pa

Maximum change in inlet pressure per PRIMAR step.

20

DTINMX

K

Maximum change in inlet temperature per PRIMAR step.

21

DTMMXB

s

Maximum main time step after the onset of boiling.

22

DPWMAX

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

23

ASCRAM

Not currently used.

24

PSCRAM

Normalized total power for scram initiation.

Relevant for IPOWER=0, NPK=0.

25

GSCRAM

Not currently used.

26

DTSSCP

s

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

27

EPSSCP

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

28-87

DXMAPR

Not currently used.

88

DTNULL

s

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

Not used if ISSNUL=0.

89

TPCOST

s

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

90

TPCOLE

s

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

91

TPCOEN

s

Time to stop writing data for core images.

92

DTPICP

s

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

93

DTPICL

s

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

94

DTMMAX

s

Maximum main time step length. Default = DT0.

95-104

DTMIN (I)

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.

105-114

TDTMIN (I)

s

See DTMIN above.

115-149

TMAINS

s

Problem times for forced main time step termination.

150

DELSCR

s

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

151

DELPUM

s

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

152

PUHALF

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.

153

OPCDUM

Not currently used.

154

GRAVITY

m/s^2

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

155

ADJKTOL

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.

156-250

OPCDUM

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