Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Effects of superimposed cyclic operation on corrosion products activity in reactor cooling system of AP-1000

  • Mahmood, Fiaz (School of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Hu, Huasi (School of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Lu, Guichi (School of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Ni, Si (School of Nuclear Science and Technology, Xi'an Jiaotong University) ;
  • Yuan, Jiaqi (School of Nuclear Science and Technology, Xi'an Jiaotong University)
  • Received : 2018.11.18
  • Accepted : 2019.02.06
  • Published : 2019.05.25
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Abstract

It is essential to predict the radioactivity distribution around the reactor cooling system (RCS) during obligatory cyclic operation of AP-1000. A home-developed program CPA-AP1000 is upgraded to predict the response of activated corrosion products (ACPs) in the RCS. The program is written in MATLAB and it uses state of the art MCNP as a subroutine for flux calculations. A pair of cyclic power profiles were superimposed after initial full power operation. The effect of cyclic operation is noticed to be more prominent for in-core surfaces, followed by the primary coolant and out-of-core structures. The results have shown that specific activity trends of $^{56}Mn$ and $^{24}Na$ promptly follow the power variations, whereas, $^{59}Fe$, $^{58}Co$, $^{99}Mo$ and $^{60}Co$ exhibit a sluggish power-following response. The investigations pointed out that promptly power-following response of ACPs in the coolant is vital as an instant radioactivity source during leakage incidents. However, the ACPs with delayed power-following response in the out-of-core components are perceived to cause a long-term activity. The present results are found in good agreement with those for a reference PWR. The results are useful for source term monitoring and optimization of work procedures for an innovative reactor design.

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References

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