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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:
LOCATION100% LOAD TEMPERATURE   10% LOAD TEMPERATURE
Core fuel center line555 C509 C
Fuel tube inside wall surface517 C504 C
Fuel tube outside wall surface502 C502 C
Active fuel bundle discharge502 C502 C
Intermediate heat exchanger primary inlet502 C502 C
Intermediate heat exchanger primary discharge340 C340 C
Intermediate heat exchanger secondary inlet330 C~ 330 C
Intermediate heat exchanger secondary discharge490 C500 C
Steam generator top section primary inlet490 C500 C
Steam generator top section primary discharge470 C~ 470 C
Steam generator bottom section primary inlet470 C470 C
Steam generator bottom section primary discharge330 C320 C
Steam generator water 320 C320 C
Steam generator discharge steam 440 C~ 470 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 temperature = 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 470 C to 350 C by mixing a 6X flow of 330 C recirculated sodium with 470 C sodium discharged from the upper portion of the steam generator.
7) At part load the recirc pump does not slow so the recirc flow is much much greater than the main loop flow.
 

This web page last updated October 23, 2019

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