XYLENE POWER LTD.

FNR TEMPERATURE PROFILE

By Charles Rhodes, P.Eng., Ph.D.

DESIGN OPERATING CONDITIONS:
The FNR termperature profile must remain within the design specifications all the way from no load to full load. The design temperature profile is as follows:

LOCATION	100% LOAD	10% LOAD
Core fuel center line max, 2 adjacent blocked cooling channels	560 C	470 C
Core fuel center line max, normal operation	510 C	465 C
Active fuel bundle sodium discharge	460 C	460 C
Intermediate heat exchanger primary inlet	460 C	460 C
Intermediate heat exchanger primary discharge	410 C	455 C
Intermediate heat exchanger secondary inlet	340 C	322 C
Intermediate heat exchanger secondary discharge	450 C	459 C
Steam generator shell primary inlet	440 C	458 C
Steam generator shell primary discharge	330 C	321 C
Steam generator water	320 C	320 C
Steam generator discharge steam	400 C	420 C
Intermediate sodium loop return	340 C	322 C
Primary sodium pool bottom	410 C	455 C

 

DESIGN ASSUMPTIONS:
1) Full load sodium temperature rise as it transits the core zone = 50 degrees C.
2) Full load temperature drop between fuel center line and adjacent liquid sodium = 50 C;
3) Full load temperature drop across intermediate heat exchanger tube wall = 10 C:
4) Full load temperature drop across sodium-salt heat exchanger wall = 10 deg C;
5) Full load temperature drop across steam generator tube wall below water level = 10 C;
6) Full load temperature difference between steam generator upper section sodium inlet temperature and steam temperature = 40 C;
7) Steam generator lower section has a recirculation pump which raises its water inlet temperature from 100 C to 320 C.
 

This web page last updated October 24, 2021