4.8. Input/Output Description¶
Table 4.8.1 contains a listing of SAS4A/SASSYS‑1 input locations that are relevant to the point kinetics and reactivity feedback models. Table 4.8.2 contains a listing of input locations that are relevant to the new decay heat model. A complete description of all SAS4A/SASSYS‑1 input may be found in Section 2.8.2.
The new decay heat model is compatible with old input decks. However, to support the larger number of terms in the ANS standard as well as specifying multiple curves within a single decay heat region, new input locations have been specified. The new decay heat model still supports a total of 5 user-supplied decay heat curves, but also supports up to eight built-in standard curves. (Currently, only four are defined by the code.) A total of 10 decay heat regions can be defined using any combination of decay heat curves. User-supplied integer input for the decay heat model is contained in Block 1 (INPCOM). Floating-point input is contained in Block 12 (POWINA).
The simplest usage of the new decay heat model is one that takes advantage of the built-in standard curves. For example, a problem with a single decay heat region that can be characterized by the decay heat from U-235 fission requires only two input parameters: NDKGRP = 23 and DKANSI(1,1) = 1.0.
In addition to the decay heat input described below, the
channel-dependent input parameter IDKCRV must
be specified to indicate which decay heat region each channel belongs.
If this value is zero, no decay heat will be calculated for that
channel, and power from the predefined non-decay-heat region will be
used. Similarly, the association of bypass channels with decay heat
regions is defined by IDKTYP.
On each main time step, the following quantities are printed: a) total reactor power (normalized to unity at time zero), b) decay-heat power, c) integrated energy (full-power seconds), d) net reactivity, e) programmed reactivity, f) control rod drive expansion reactivity, g) Doppler reactivity, h) fuel and cladding axial expansion reactivity, i) coolant reactivity, j) fuel-motion reactivity, and k) cladding-motion reactivity. In addition, the coolant, fuel, cladding, axial expansion and Doppler reactivity for each channel are also printed at each main time step. This information is also printed following each major print in expanded form (more significant digits), along with the group-wise values of the delayed-neutron precursor concentrations and decay-heat powers.
Symbol |
Reference |
Name |
Block |
Location |
Suggested Value |
|---|---|---|---|---|---|
IPOWER |
1 |
8 |
0 or 1 |
||
IPOWOP |
1 |
9 |
0 or 1 |
||
NPK |
1 |
10 |
0 |
||
NDELAY |
1 |
16 |
≥0, ≤6 |
||
NPREAT |
1 |
18 |
≥0, ≤20 |
||
ICREXP |
1 |
31 |
≥0, ≤3 |
||
IDBPWI |
1 |
35 |
0 or 1 |
||
IRADEX |
1 |
36 |
≥−7, ≤7 |
||
NFUELD |
1 |
39 |
<0 |
||
NOREAC |
1 |
41 |
≥0 |
||
NSRMTB |
1 |
43 |
Not used. |
||
NSUBTC |
1 |
51 |
≥0 |
||
MTGRD |
1 |
52 |
1 or 2 |
||
MTACLP |
1 |
53 |
1 or 2 |
||
MTTLP |
1 |
54 |
1 or 2 |
||
MODEEX |
1 |
55 |
≥0, ≤3 |
||
JREEXT |
1 |
56 |
0 or 1 |
||
IREACT |
1 |
58 |
≥−2, ≤2 |
||
NSUBTR |
1 |
59 |
≥0 |
||
NRRNGS |
1 |
60 |
0,1, or 2 |
||
MTRRAC |
1 |
61 |
1 or 2 |
||
MTRFAC |
1 |
63 |
1 or 2 |
||
MTRFT |
1 |
64 |
1 or 2 |
||
IROPT |
1 |
65 |
0 or 1 |
||
JCRIND |
1 |
66 |
>0 |
||
ICRDDB |
1 |
71 |
0,1, or 2 |
||
ICRTMP |
1 |
72-74 |
≥0 |
||
ICRNOD |
1 |
75-77 |
|||
NSEGCR |
1 |
78 |
>0 |
||
MTCB |
1 |
81 |
1 or 2 |
||
KDEBUG |
1 |
82 |
0 or 1 |
||
KEBRS1 |
1 |
83 |
≥0 |
||
KEBRS2 |
1 |
84 |
≥0 |
||
IDBDKH |
1 |
85 |
|||
NULLD3 |
1 |
86 |
|||
NOFDBK |
1 |
89 |
≥0 |
||
IBOWTP |
1 |
102 |
0 or 1 |
||
KCHUIS |
3 |
1209-1242 |
Not used. |
||
NRREAC |
3 |
1292 |
≥0 |
||
ISLREA |
3 |
1293-1300 |
≥0 |
||
LBYP |
3 |
1301 |
≥0 |
||
LELBYP |
3 |
1302-1309 |
≥0 |
||
EPSPOW |
11 |
3 |
\(10^{- 4}\) |
||
ASCRAM |
11 |
23 |
Not used. |
||
PSCRAM |
11 |
24 |
Not used. |
||
GSCRAM |
11 |
25 |
Not used. |
||
POW |
12 |
1 |
|||
\(\Lambda\) |
Eq. 4.2-4 |
GENTIM |
12 |
2 |
|
POWTOT |
12 |
3 |
|||
\(\beta_{\text{i}}\) |
Eq. 4.3-1 |
BETADN |
12 |
4-9 |
|
\(\lambda_{\text{i}}\) |
Eq. 4.3-1 |
DECCON |
12 |
10-15 |
|
OLDBDK |
12 |
16-21 |
Not used. |
||
OLDDKL |
12 |
22-27 |
Not used. |
||
OLDBDT |
12 |
28 |
Not used. |
||
PREATB |
12 |
29 |
|||
PREATM |
12 |
49 |
|||
FRPR |
12 |
69 |
|||
\(L_{\text{cr}}\) |
Eq. 4.5-36 |
CRDLEN |
12 |
71 |
|
\(\alpha_{\text{cr}}\) |
Eq. 4.5-36 |
CRDEXP |
12 |
72 |
|
\(a_{\text{cr}}\) |
Eq. 4.5-39 |
ACRDEX |
12 |
73 |
|
\(b_{\text{cr}}\) |
Eq. 4.5-39 |
BCRDEX |
12 |
74 |
|
\(M_{\text{cr}}C_{\text{cr}}\) |
Eq. 4.5-29 |
CRDMC |
12 |
75 |
|
\(h_{\text{cr}}A_{\text{cr}}\) |
Eq. 4.5-29 |
CRDHA |
12 |
76 |
|
\(V_{\text{ui}}\) |
Eq. 4.5-30 |
UIVOL |
12 |
77 |
|
\(C_{\text{re}}\) |
Eq. 4.5-23 |
RDEXPC |
12 |
78 |
|
\(\frac{{\text{XMC}}}{{\text{XAC}}}\) |
Eq. 4.5-23 |
XMCXAC |
12 |
79 |
|
SCRTAB |
12 |
80 |
Not used. |
||
SCRTME |
12 |
90 |
Not used. |
||
PRETB2 |
12 |
100-179 |
|||
PRETM2 |
12 |
180-259 |
|||
\(S_{{\text{GRMAX}}}\) |
Eq. 4.5-27 |
SLLMAX |
12 |
408 |
|
PITCHG |
12 |
409 |
|||
PITCHA |
12 |
410 |
|||
PITCHT |
12 |
411 |
|||
RDEXCF |
12 |
412 |
|||
TLPRRC |
12 |
413 |
|||
BNDMM1 |
12 |
414 |
|||
BNDMM2 |
12 |
415 |
|||
TINSRT |
12 |
416 |
|||
REAINS |
12 |
417 |
|||
TLIMIT |
12 |
418 |
|||
DFLTCS |
12 |
419 |
|||
DFLTSS |
12 |
420 |
|||
ACLPRC |
12 |
421 |
|||
FCDTR1 |
12 |
422 |
|||
FCDTR2 |
12 |
423 |
|||
FCDTRF |
12 |
424 |
|||
DRCOLL |
12 |
425 |
|||
CRSAC |
12 |
426 |
|||
RR1TC |
12 |
427 |
|||
RR2TC |
12 |
428 |
|||
RODID |
12 |
429 |
|||
RODOD |
12 |
430 |
|||
SHRDLN |
12 |
431-433 |
|||
SHRDID |
12 |
434-436 |
|||
SHRDOD |
12 |
437-439 |
|||
RHOCRD |
12 |
440 |
|||
HTCPCR |
12 |
441 |
|||
CONDCR |
12 |
442 |
|||
VFCRD |
12 |
443 |
|||
HFILM |
12 |
444 |
|||
FLSHRD |
12 |
445 |
|||
AREACR |
12 |
446 |
|||
FLOEXP |
12 |
447 |
|||
ACLPEL |
12 |
448 |
|||
TLPEL |
12 |
449 |
|||
PTCHRA |
12 |
450 |
|||
PTCHRT |
12 |
451 |
|||
RCBARR |
12 |
452 |
|||
FCDTCB |
12 |
453 |
|||
CB2TC |
12 |
454 |
|||
YKNF |
12 |
455 |
|||
YKHF |
12 |
456 |
|||
YKNNA |
12 |
457 |
|||
YKNSS |
12 |
458 |
|||
YRCUR |
12 |
459 |
|||
YRCLR |
12 |
460 |
|||
YRCRR |
12 |
461 |
|||
YRCCR |
12 |
462 |
|||
YRCGP |
12 |
463 |
|||
YRCDOP |
12 |
464 |
|||
YDELT0 |
12 |
465 |
|||
YABOW |
12 |
466 |
|||
YBBOW |
12 |
467 |
|||
FCR |
12 |
468 |
|||
YTCUT |
12 |
469 |
|||
\(\varepsilon_{\text{ex}}\) |
EXPCOF |
13 |
1263 |
||
IAXEXP |
51 |
181 |
0, 1, or 2 |
||
IDKCRV |
51 |
203 |
≥0, ≤5 |
||
ICHUIS |
51 |
362 |
0 or 1 |
||
IPOWRZ |
51 |
364 |
0 or 1 |
||
IREACZ |
51 |
365 |
0 or 1 |
||
\(\gamma_{\text{s}}\) |
Eq. 3.3-22 |
GAMSS |
62 |
2 |
|
\(\gamma_{\text{c}}\) |
Eq. 3.3-22 |
GAMTNC |
62 |
4 |
|
\(\gamma_{\text{e}}\) |
Eq. 3.3-22 |
GAMTNE |
62 |
5 |
|
\(\overline{P}\) |
PSHAPE |
62 |
6-29 |
||
\(P_{\text{r}}\) |
PSHAPR |
62 |
30-44 |
||
\(\alpha_{\text{D}}\) |
Eq. 4.5-2 |
ADOP |
62 |
62 |
|
\(\alpha_{\text{D}}\) |
Eq. 4.5-2 |
BDOP |
62 |
63 |
|
WDOPA |
62 |
64-111 |
|||
\(\left( \rho_{\text{c}} \right)_{\text{jI}}\) |
Eq. 4.5-22 |
VOIDRA |
62 |
112-159 |
|
\(R_{\text{e}}\) |
CLADRA |
62 |
160-207 |
||
\(R_{\text{f}}\) |
Eq. 4.5-20 |
FUELRA |
62 |
208-255 |
|
PRSHAP |
62 |
256 |
|||
PSHPTP |
62 |
257-261 |
|||
PSHPBT |
62 |
262-266 |
|||
XRFSHP |
62 |
268 |
|||
XRNSHP |
62 |
269 |
|||
XRSSHP |
62 |
270 |
|||
PSHAPC |
62 |
271-318 |
|||
PSHAPB |
62 |
319-366 |
|||
\(\alpha_{\text{f}}\) |
Eq. 4.5-4 |
FUELEX |
63 |
73 |
|
\(\alpha_{\text{e}}\) |
Eq. 4.5-5 |
CLADEX |
63 |
74 |
|
\(Y_{\text{f}}\) |
Eq. 4.5-8 |
YFUEL |
63 |
75 |
|
\(Y_{\text{e}}\) |
Eq. 4.5-8 |
YCLAD |
63 |
76 |
|
\(\varepsilon_{\text{ex}}\) |
Eq. 4.5-21 |
EXPCFF |
63 |
79 |
Symbol |
Reference |
Name |
Block |
Location |
Comments |
|---|---|---|---|---|---|
NDKGRP |
1 |
17 |
max = 24 |
||
NPOWDK |
1 |
45 |
max = 5 |
||
NPDKST |
1 |
46 |
max = 8 |
||
\(\beta_{\text{n}}\) |
BETADK or DKBET2 |
12 |
260-289 511-630 |
deprecated, use DKBET2 |
|
\(\lambda_{\text{n}}\) |
DKLAM or DKLAM2 |
12 |
290-319 631-750 |
deprecated, use DKLAM2 |
|
\(\beta_{\text{d}}\) |
BETAHT |
12 |
320-324 |
||
\(x_{\text{i}}\) |
DKFRAC |
12 |
751-800 |
||
\(x_{\text{i}}\) |
DKANSI |
12 |
801-880 |
||
\(P_{\text{t}}^{k}\) |
POWLVL and PWLVL2 |
12 |
325-364 881-920 |
PWLVL2 is an extension of POWLVL |
|
\(\tau_{\text{k}}\) |
POWTIM and PWTIM2 |
12 |
365-404 921-960 |
PWTIM2 is an extension of POWTIM |
|
\(Q_{\text{t}}\) |
QETOT |
12 |
961-968 |
default = 200 MeV |