2.8.2.13. Block 62 — POWINC — Channel-Dependent Power and Reactivity Input

FPDAYS

1

Effective full power days during the steady state irradiation. Used with FLTPOW to determine cladding fluence when BURNFU is not used.

GAMSS

2

Fraction of total power in direct heating of structure.

DUM002

3

Not currently used.

GAMTNC

4

Fraction of total power in direct heating of coolant.

GAMTNE

5

Fraction of total power in direct heating of cladding.

PSHAPE (J)

6-29

Ratio of pin power at axial segment J to the power POW in the peak axial fuel pin segment, 1 ≤ J ≤ MZ. MZ is the number of axial heat transfer segments in the core plus axial blankets. Enter only for IPOWRZ = 0. The first entered segment value (J=1) is for the lower-most segment in the lower axial blanket. Values are normalized to POW or POWTOT using NPIN, NSUBAS, and PRSHAP at the initial steady-state.

PSHAPR (I)

30-44

Radial power shape within pin by radial node, I, normalized power per unit fuel mass, 1 ≤ I ≤ NT.

PLIN (M)

45-52

When MSTEP≤ 8, relative power level at the end of the M steady-state division. It is required that PLIN is 1.0 at the end of the steady-state. It is assumed that during power change periods, the power varies linearly over the time interval from the previous value to the current PLIN(M) value. (M = 1, MSTEP)

TPLIN (M)

53-60

When MSTEP≤ 8, time (from fresh start-up) at the ends of the M steady-state divisions (seconds). M = 1, MSTEP.

FLTPOW

61

(\#/m^2-s)/(W/m)

Fast flux to linear power ratio.

ADOP

62

∆k/K

Doppler coefficient for this channel when part of the core represented by this channel is not voided.

BDOP

63

∆k/K

Doppler coefficient for this channel when part of the core represented by this channel is fully voided.

WDOPA (J)

64-111

Doppler axial weighting factor. Enter MZ values for IREACZ=0. Enter MZC-1 values for IREACZ=1.

VOIDRA (J)

112-159

∆k/k-kg

Coolant void reactivity worth per unit coolant mass. Enter MZ values for IREACZ=0. Enter MCZ-1 values for IREACZ=1.

CLADRA (J)

160-207

∆k/k-kg

Cladding reactivity worth per unit cladding mass. Enter MZ values for IREACZ=0. Enter MCZ-1 values for IREACZ=1.

FUELRA (J)

208-255

∆k/k-kg

Fuel reactivity worth per unit fuel mass. Enter MZ values for IREACZ=0. Enter MCZ-1 values for IREACZ=1.

PRSHAP

256

Ratio of power per subassembly averaged over this channel to the power per sub- assembly averaged over all channels.

Note: These values are normalized by the code over all assemblies such that the average is 1.0.

PSHPTP (J)

257-261

In PINACLE, PLUTO2, and LEVITATE for IPOWRZ=0, ratio of active fuel power at axial segment KCORE2+J to the power POW in the peak axial fuel segment. 1 ≤ J ≤ 5. KCORE2 is the top active fuel node. This array is used when active fuel relocates above the original active fuel, either in-pin (PINACLE) or ex-pin (PLUTO2, LEVITATE).

PSHPBT (J)

262-266

In PLUTO2 and LEVITATE for IPOWRZ=0, ratio of active fuel power at axial segment KCORE1 - J to the power POW in the peak axial fuel segment. 1 ≤ J ≤ 5. KCORE1 is the bottom active fuel node. This array is used when active fuel relocates below the original active fuel due to ex-pin fuel motion (PLUOT2, LEVITATE).

FLOWBU

267

Fraction of subassemblies in channel that have low (<2.9 at.%) burnup.

XRFSHP

268

Relative reactivity worth of fuel in the channel. Used in EBR-II feedback model.

XRNSHP

269

Relative reactivity worth of sodium in the channel. Used in EBR-II feedback model.

XRSSHP

270

Relative reactivity worth of stainless steel in the channel. Used in EBR-II feedback model.

PSHAPC (J)

271-318

Ratio of core fuel pin power at axial segment J to the power POW in the peak axial fuel pin segment, 1 ≤ J ≤ MZC-1. MZC-1 is the number of axial coolant segments. Enter only for IPOWRZ = 1. The first entered segment value (J=1) is for the lower-most segment in the lower axial reflector. Values are normalized to POW or POWTOT using NPIN, NSUBAS, PRSHAP, PSHAPB, and the core fuel and blanket fuel mass distributions at the initial steady-state.

PSHAPB (J)

319-366

Ratio of blanket fuel pin power at axial segment J to the power POW in the peak axial fuel pin segment, 1 ≤ J ≤ MZC-1. MZC-1 is the number of axial coolant segments. Enter only for IPOWRZ = 1. The first entered segment value (J=1) is for the lower-most segment in the lower axial reflector. Values are normalized to POW or POWTOT using NPIN, NSUBAS, PRSHAP, PSHAPC, and the core fuel and blanket fuel mass distributions at the initial steady-state.

EBR-II MK-V SAFETY CASE INPUT

FHTCLD

367

Cladding steady-state hot channel factor.

FUNKCL

368

Transient cladding thermal conductivity uncertainty factor.

FUNKFU

369

Transient fuel thermal conductivity uncertainty factor. Used for IMETAL > 0 and IFUELM = 2.

FUNFLM

370

Transient film heat transfer uncertainty factor.

FHTFUL

371

Fuel steady-state hot channel factor.

FUNCOL

372

Transient coolant flow uncertainty factor.

FPKNG

373

Peaking factor.

FUNPOW

374

Transient power uncertainty factor.

END OF EBR-II MK-V SAFETY CASE INPUT

COILP0

375

See FED.

COILP1

376

See FED.

COILP2

377

See FED.

STRCRA (J)

378-425

∆k/k-kg

Structure reactivity worth per unit structure mass. Enter MZ values for IREACZ=0. Enter MCZ-1 values for IREACZ=1.