Supercritical Water Reactor: Density & Temperature Impact

[Aly_19f]

TL;DR

Density variation of supercritical water.

Hi, I'm working on an MCNPX design for the Supercritical Light Water Reactor, and I want to know how does the density of the water -which plays the role of the coolant and moderator- change with temperature?
I think the pressure is fixed at 25MPa, but the temperature of the water may vary, Does and How does this variation affect on its density?

 

[Astronuc]

Summary:: Density variation of supercritical water.

I think the pressure is fixed at 25MPa, but the temperature of the water may vary, Does and How does this variation affect on its density?

Yes, temperature and pressure affect density.

https://iopscience.iop.org/article/10.1088/1755-1315/555/1/012036/pdf

https://www.nuclear-power.com/nucle...ical-water/properties-of-supercritical-water/
https://www.nuclear-power.com/nucle.../properties-of-water/critical-point-of-water/

In water, the critical point occurs at 647.096 K (373.946 °C; 705.103 °F) and 22.064 megapascals (3,200.1 psi; 217.75 atm)

From Wikipedia article Ref 2, Wagner, W.; Pruß, A. (June 2002). "The IAPWS Formulation 1995 for the Thermodynamic Properties of Ordinary Water Substance for General and Scientific Use". Journal of Physical and Chemical Reference Data. 31 (2): 398. doi:10.1063/1.1461829

I would recommend obtaining the original source, and preferably the latest version of IAPWS.
http://www.iapws.org/
http://www.iapws.org/relguide/IF97-Rev.html

 

[Aly_19f]

I'm very thankful for your answer, these links will help me a lot.
Thank you.