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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:
LOCATIONFULL LOAD TEMPERATURE   NO LOAD TEMPERATURE
Core fuel center line488 C450 C
Fuel tube inside wall surface465 C450 C
Fuel tube outside wall surface450 C450 C
Active fuel bundle discharge440 C450 C
Intermediate heat exchanger primary inlet440 C450 C
Intermediate heat exchanger primary discharge340 C450 C
Intermediate heat exchanger secondary inlet330 C~ 320 C
Intermediate heat exchanger secondary discharge430 C450 C
Steam generator top section primary inlet430 C450 C
Steam generator top section primary discharge410 C320 C
Steam generator bottom section primary inlet350 C320 C
Steam generator bottom section primary discharge330 C320 C
Steam generator water 320 C320 C
Steam generator discharge steam 390 C~ 330 C
Intermediate sodium loop return330 C320 C
Primary sodium pool bottom340 C340 C

 

DESIGN ASSUMPTIONS:
1) Full load temperature drop across fuel tube wall = 15 C;
2) Full load temperature drop across intermediate heat exchanger tube wall = 10 C:
3) Full load temperature drop across steam generator tube wall below water level = 10 C;
4) Full load temperature difference between steam generator upper section sodium inlet temperature and steam tempperature = 40 C;
5) Full load thermal power distribution in steam generator is 80% in bottom section, 20% in top section.
6) Steam generator lower section has a recirculation pump which reduces its inlet temperature from 410 C to 350 C by mixing a sufficient flow of 330 C recirculated sodium with 410 C sodium discharged from the upper portion of the steam generator.
 

This web page last updated June 20, 2019

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