================================================================================
Block 14 --- PRIMIN --- Primary Loop Input Data
================================================================================

.. default-role:: sasinp

.. sasblock:: PRIMIN 14

.. sasinp:: PX
	:location: 1
	:units: Pa

	Coolant exit pressure at `ZPLENU`\ .

.. sasinp:: PDEC
	:location: 2
	:units: 1/s

	Pump head decay constant. (See `PDEC1` and PDEC2).

.. sasinp:: PDEC1
	:location: 3
	:units: 1/s^2

	Pump head decays as exp (-\ `PDEC`\ \*t - `PDEC1`\ \*t\ :sup:`2` - `PDEC2`\*t\ :sup:`3`).

.. sasinp:: PDEC2
	:location: 4
	:units: 1/s^3

	Pump head decays as exp (-\ `PDEC`\ \*t - `PDEC1`\ \*t\ :sup:`2` - `PDEC2`\*t\ :sup:`3`).

.. sasinp:: PRETAB (L)
	:location: 5-24

	Normalized inlet coolant driving pressure or coolant flow rate table as a function of `PRETME`\ . Used only if `IPRION` ≠ 4. The inlet coolant driving pressure is the pressure difference between the subassembly inlet and outlet minus the gravity head across the subassembly.
	(See `IFLOW`\ ).

.. sasinp:: PRETME (L)
	:location: 25-44
	:units: s

	Time for `PRETAB` table.

.. sasinp:: T0TAB (L)
	:location: 45-64
	:units: K

	Inlet temperature. (See `NT0TAB`\ ).

.. sasinp:: T0TME (L)
	:location: 65-84
	:units: s

	Time for `T0TAB` table.

.. sasinp:: TNTRY
	:location: 85
	:units: K

	Re-entry temperature. Used only if PRIMAR-4 is not used.

.. sasinp:: DPGRV0
	:location: 86
	:units: Pa

	The primary loop gravity head. If 0.0, `DPGRV0` is calculated at steady-state.
	Used only if `IPRION` ≠ 4.

.. sasinp:: ZPLENL
	:location: 87
	:units: m

	Reference elevation for the coolant inlet plenum.

.. sasinp:: ZPLENU
	:location: 88
	:units: m

	Reference elevation for the coolant outlet plenum.

.. sasinp:: ZIHX
	:location: 89
	:units: m

	Location of the thermal center of the intermediate heat exchanger. Used if `IPRION` ≠ 4 and `DPGRV0` = 0.

.. sasinp:: DZBCGL
	:location: 90
	:units: m

	Minimum distance above subassembly exit for bubble breakaway. Suggested value: 0.1.

.. sasinp:: DZBCGU
	:location: 91
	:units: m

	Maximum distance above subassembly exit for bubble breakaway. Suggested value: 0.25.
	Note: When the top of the bubble is above `DZBCGU` or the bottom is above `DZBCGL`\ , the portion above `DZBCGL` is broken away.

.. sasinp:: TIMDBG
	:location: 92
	:units: s

	Time when PRIMAR1 debug prints start.

.. sasinp:: XMXMSI
	:location: 93
	:units: kg

	Coolant mass per pin in the mixing volume at the subassembly inlet.

.. sasinp:: XMXMSO
	:location: 94
	:units: kg

	Coolant mass per pin in the mixing volume at the subassembly outlet. If this quantity varies from channel to channel, then input the value for channel which boils first.

.. sasinp:: TIMMIX
	:location: 95
	:units: s

	Time constant for heat flow between inlet mixing volume and bulk inlet plenum temperature, also between outlet mixing volume and bulk outlet plenum temperature.

.. sasinp:: THT2VL
	:location: 96

	Minimum degree of implicitness for flow calculations in PRIMAR-4 and TSCNV1.

.. sasinp:: DUMPRI
	:location: 97-150

	Not currently used.

**DEFAULT VALUES**

| XMXMSI = 0.002
| XMXMSO = 0.002
| TIMMIX = 1.00

Note: Variables marked P4 must be input when using PRIMAR-4. Other variables in this block are used for PRIMAR-1.