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Parameter ID | Description | Unit | Nominal value | Range | Discrete initial value |
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| | | | | | and associated probabilities |
LP | Linear power of electrically heated rod | | W/m | 30 | 0β30 | β |
| 1.0 |
P1 | Initial Pressure of the loop | | bar | 5 | 1β10 | 1β3β5β8β10 |
| 0.02β0.13β0.7β0.1β0.05 |
T2 | Temperature of the SS fluid at the cooler inlet | | K | 303 | 295β350 | 295β303β325β350 |
| 0.18β0.65β0.15β0.02 |
HL1 | Heat losses from the test section (TS). % of TS power | | % | 0.2 | 0β4.5 | 0.0β0.2β1.0β4.5 |
| 0.1β0.69β0.15β0.06 |
HL2 | Heat losses from the loop w/o (TS). % of TS power | | % | 3 | 0β20 | 0.0β3β10β20 |
| 0.1β0.69β0.15β0.06 |
L1 | Total length of the loop | | m | 21 | 12β34 | 12β21β28β34 |
| 0.05β0.69β0.14β0.12 |
LV | Loop volume (change of the pre-heater tank) | | m3 | 0.09 | 0.07β0.2 | 0.07β0.09β0.12β0.2 |
| 0.05β0.65β0.18β0.12 |
PV | Volume of PRZ | | m3 | 0.06 | 0.03β0.12 | 0.03β0.06β0.09β0.12 |
| 0.05β0.65β0.18β0.12 |
PN | Noding of the PRZ | | β | N | N1-N2 | N1βNβN2 |
| 0.1β0.8β0.1 |
PP | Position of the PRZ | Upstream the cooler (U) | β | U | UβD | UβD |
| Downstream the cooler (D) | | | | 0.85β0.15 |
K1 | Local pressure drop coefficient (K) at the inlet of the TS | | β | 0.2 | 0β1.2 | 0.0β0.2β0.4β1.2 |
| 0.05β0.53β0.3β0.12 |
K2 | K factor at the outlets of the TS | | β | 0.6 | 0-1 | 0.0β0.6β0.8β1.2 |
| 0.05β0.53β0.22β0.2 |
TK | Sum of the K factors, w/o TS inlet and outlet | | β | 7.5 | 3β25 | 3β7.5β15β25 |
| 0.05β0.55β0.22β0.18 |
EI | Electrical Insulation in the heater | AL2O3 (A) | β | A | A-B | AβB |
Boron nitride (B) | 0.85β0.15 |
CIT | Thickness of cooler tubes | | mm | 2 | 1β3 | 1β2β3 |
| 0.05β0.65β0.3 |
CT | Cooler tubes | | β | Cu | CuβSS | CuβSS |
| 0.85β0.15 |
E2 | Equivalent diameter of secondary side of the cooler | | mm | 10 | 7β20 | 7β10β20 |
| 0.25β0.7β0.05 |
E1 | TS Equivalent diameter (coolant passage) | | mm | 8 | 5β12 | 5β7β8β12 |
| 0.05β0.3β0.55β0.1 |
AR | Ratio of Heater heat transfer area to cooler heat transfer area | | β | 0.18 | 0.05β0.37 | 0.05β0.12β0.18β0.37 |
| 0.05β0.3β0.6β0.05 |
PD | Axial power distribution | Uniform (U) | β | U | CβS | CβUβS |
Cosine (C) | 0.1β0.65β0.25 |
Semi cosine (S) |
CO | Orientation of the cooler | Vertical (V) | β | H | IβV | IβHβV |
Horizontal (H) | 0.08β0.65β0.27 |
Inclined (I) |
MF2 | Secondary side mass flow rate | | Kg/s | 1.2 | 0.4β1.8 | 0.4β1.2β0.8β1.8 |
| 0.05β0.55β0.23β0.17 |
P2 | Secondary side pressure | | bar | 1 | 1β10 | 1β5β10 |
| 0.6β0.3β0.2 |
LS | Presence of U-pipe or loop seal in the cold part of the loop | | β | No | Yes-No | YβN |
| 0.2β0.8 |
D1 | Riser diameter | | mm | 25 | 25β100 | 25β50β75β100 |
| 0.55β0.25β0.15β0.05 |
D2 | Down comer diameter | | mm | 25 | 25β75 | 25β50β75 |
| 0.55β0.25β0.2 |
PC | PRZ Connection | Direct (D) | β | S | DβS | SβD |
Surge Line (S) | 0.8β0.2 |
G1 | Non-condensable gas mass fraction at the inlet of cooler piping | | β | 0 | 0β1 | 0.0β0.05β0.2β0.5β0.8 |
| 0.58β0.3β0.1β0.01β0.01 |
G2 | Non-condensable gas mass fraction inside the TS | | β | 0 | 0β1 | 0.0β0.05β0.3β0.5β0.8 |
| 0.58β0.3β0.1β0.01β0.01 |
UL | Undetected leakage | | Kg/s | 0 | 0β1 | 0.0β0.1β0.1β0.1 |
| 0.65β0.25β0.09β0.01 |
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