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

1

FPDAYS

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

2

GAMSS

Fraction of total power in direct heating of structure.

3

DUM002

Not currently used.

4

GAMTNC

Fraction of total power in direct heating of coolant.

5

GAMTNE

Fraction of total power in direct heating of cladding.

6-29

PSHAPE (J)

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.

30-44

PSHAPR (I)

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

45-52

PLIN (M)

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)

53-60

TPLIN (M)

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

61

FLTPOW

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

Fast flux to linear power ratio.

62

ADOP

∆k/k

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

63

BDOP

∆k/k

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

64-111

WDOPA (J)

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

112-159

VOIDRA (J)

∆k/k-kg

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

160-207

CLADRA (J)

∆k/k-kg

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

208-255

FUELRA (J)

∆k/k-kg

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

256

PRSHAP

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.

257-261

PSHPTP (J)

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).

262-266

PSHPBT (J)

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).

267

FLOWBU

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

268

XRFSHP

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

269

XRNSHP

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

270

XRSSHP

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

271-318

PSHAPC (J)

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.

319-366

PSHAPB (J)

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

367

FHTCLD

Cladding steady-state hot channel factor.

368

FUNKCL

Transient cladding thermal conductivity uncertainty factor.

369

FUNKFU

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

370

FUNFLM

Transient film heat transfer uncertainty factor.

371

FHTFUL

Fuel steady-state hot channel factor.

372

FUNCOL

Transient coolant flow uncertainty factor.

373

FPKNG

Peaking factor.

374

FUNPOW

Transient power uncertainty factor.

END OF EBR-II MK-V SAFETY CASE INPUT

375

COILP0

See FED.

376

COILP1

See FED.

377

COILP2

See FED.

378-425

STRCRA (J)

∆k/k-kg

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