Minor Design Changes for Controlling Reactor Inlet Header Temperatures in CANDU Reactors
32nd Annual CNS Conference - 2011 June 05-08


Presented at:
32nd Annual CNS Conference
2011 June 05-08
Location:
Niagara Falls, Canada
Session Title:
Thermalhydraulics

Authors:
Emma Yang (AMEC NSS)
James Sherin (AMEC NSS)
Vinod Chugh (AMEC NSS)
  

Abstract

Most CANDU operators are dealing with increasing Reactor Inlet Header (RIH) Temperatures.  Expensive Steam Generator (SG) tube cleaning campaigns have been executed on a number of units with varying degrees of success.  Other operators have resorted to boiler pressure reductions, which in some cases is leading to unit deratings and lost production.  Several minor design changes were evaluated as an alternative means for controlling RIH temperature.  The general conclusion of the study is that in the right circumstances, minor design changes can provide a cost effective means of controlling RIH temperatures by avoiding or deferring repeated Inner Diameter (ID) SG tube cleanings and/or additional power deratings.

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