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Block 65 --- FUELIN --- Channel-Dependent Fuel Input
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.. default-role:: sasinp

.. sasblock:: FUELIN 65

.. sasinp:: FSPEC
	:location: 1

	Fuel-pin failure criterion, threshold value. `IERSTP`

	(See also `FMELTM` and `PCFAIL`).

	See `MFAIL`.

.. sasinp:: FMELTM
	:location: 2

	The minimum fuel melt fraction that must exist at the failure node before PLUTO2 or LEVITATE is allowed to be called.

	Suggested value: 0.2 (must be input > 0).

.. sasinp:: DENS
	:location: 3
	:units: kg/m^3

	Liquid cladding density at the liquidus.

.. sasinp:: AE
	:location: 4
	:units: 1/K

	Coefficient of linear expansion of solid cladding (=1/3 volume coefficient).

.. sasinp:: RHOCD
	:location: 5
	:units: 1/K

	Volumetric coefficient of expansion for liquid cladding.

.. sasinp:: VISMC
	:location: 6
	:units: Pa-s

	Viscosity of cladding at liquidus temperature. At higher temperatures,

	viscosity= `VISMC`\ \*EXP( `AVISC` / `TELIQ` - `AVISC` /T).

.. sasinp:: VISTR
	:location: 7
	:units: Pa-s

	Viscosity of cladding at solidus temperature. Between solidus and liquidus,

	viscosity=(\ `VISTR`\ -\ `VISMC`\ )\*
	(1-FMELTC)\*\* `XVISC` + `VISMC`

	where FMELTC is the melt fraction.

.. sasinp:: VISSC
	:location: 8
	:units: Pa-s

	Viscosity of refrozen cladding. This is used as viscosity below solidus.

.. sasinp:: XVISC
	:location: 9

	Exponent in viscosity equation.

.. sasinp:: CLADFR
	:location: 10

	Moody friction factor for the molten cladding during turbulent cladding flow over the fuel rod.

.. sasinp:: REBRK
	:location: 11

	Laminar to turbulent transition Reynolds number for molten cladding flow.

.. sasinp:: GMULTF
	:location: 12

	Constants in molten cladding and sodium vapor two-phase friction multiplier.

	Multiplier = CHOR\*(1.0+\ `GMULTF`\ \*(1.0-MAX(ALPH, `ALPHCR` )))

	where ALPH is void fraction. The incoherence (time delay) factor is:

	CHOR=MAX(0.01,MIN(1.0,(FPS/ `FPS0` )\*\* `EXPFPS` ))

	where FPS is the time in full-power seconds since cladding first moved in the channel.

.. sasinp:: ALPHCR
	:location: 13

	See `GMULTF`.

.. sasinp:: FPS0
	:location: 14

	See `GMULTF`.

.. sasinp:: EXPFPS
	:location: 15

	See `GMULTF`.

.. sasinp:: AMELT
	:location: 16

	Not currently used.

.. sasinp:: CLSTHR
	:location: 17

	Multiplier for frozen cladding-structure heat transfer.

	Suggested value: 1.0.

.. sasinp:: FRACPD
	:location: 18

	Not currently used.

.. sasinp:: PCFAIL
	:location: 19
	:units: Pa

	Pin cavity pressure at pin failure time. Only necessary if the transient DEFORM calculation is not used (\ `ISSFU2` .NE.1) or if CLAP preceded LEVITATE in this channel. May also be useful for overriding the DEFORM calculated cavity pressure for parametric studies. For `PCFAIL` < 1, the DEFORM calculated cavity pressure is used in PLUTO and LEVITATE. This is the recommended option when it can be used.

.. sasinp:: AVISC
	:location: 20
	:units: K

	Constant in viscosity equation. (See `VISMC`).

.. sasinp:: CPC
	:location: 21
	:units: J/kg-K

	Specific heat capacity of molten cladding at the liquidus temperature.

.. sasinp:: FPINAC
	:location: 22

	Areal fraction of fuel, with enthalpy exceeding the melting threshold of at least `FNMELT` of the heat of fusion, required to initiate PINACLE ; i.e. for in-pin pre-failure fuel motion to begin.
	See `FNMELT` and `CPINAC` .

	Recommended value: 2 radial nodes.

.. sasinp:: CPINAC
	:location: 23

	Also, at least 3 contiguous axial nodes must satisfy the condition: Molten fuel fraction > `FPINAC` x `CPINAC` in order to initiate PINACLE.
	Recommended value: 0.5.

.. sasinp:: RHOREF
	:location: 24

	Not currently used.

.. sasinp:: WUREF
	:location: 25

	Fabricated uranium weight fraction in the metal fuel in the SSCOMP model (\ `IFUELO` = 1).

.. sasinp:: WPUREF
	:location: 26

	Fabricated plutonium weight fraction in the metal fuel in the SSCOMP model (\ `IFUELO` = 1).

.. sasinp:: WZRREF
	:location: 27

	Fabricated zirconium weight fraction in the metal fuel in the SSCOMP model (\ `IFUELO` = 1).

.. sasinp:: DFUELX
	:location: 28-51

	Not currently used.

.. sasinp:: FUSLDT
	:location: 52
	:units: m

	Maximum axial displacement of the upper fuel blanket or/and sodium slug above the fuel active top.

.. sasinp:: FUSLMA
	:location: 53
	:units: kg/pin

	Total mass of the upper fuel blanket or/and sodium slug above fuel pin top.

.. sasinp:: BURNFU
	:location: 54
	:units: at\%

	Axially averaged fuel pin burnup for metal fuel pins used in the SSCOMP model (\ `IFUELO` = 1). Also used for `IFUELM` = 2.

	| = 0,  `FPDAYS` and `FLTPOW` used to calculate cladding fluence.
	| > 0,  `BURNFU` determines cladding fluence.

.. sasinp:: XPUZR
	:location: 55-198

	Post-zone formation plutonium and Zirconium weight fractions in the central zone, followed by those in the middle zone and those in the outer zone.

	Not currently used.

.. sasinp:: GASRTM
	:location: 199

	Not currently used.

.. sasinp:: TIRRFU
	:location: 200
	:units: K

	Cladding steady state irradiation temperature at the top of the fuel region for metal fueled pins. Used in life fraction calculation.

	| ≤ 0, Maximum temperature during steady state at each axial node used.
	| > 0, And `ISSFUE` = 0, value applied to each axial node

.. sasinp:: DFUELI
	:location: 201-300

	Not currently used.