| 论文简介 |
Mahmood, F (Mahmood, Fiaz)[ 1 ] ; Hu, HS (Hu, Huasi)[ 1 ] ; Cao, LZ (Cao, Liangzhi)[ 1 ] ; Lu, GC (Lu, Guichi)[ 1 ] ; Ni, S (Ni, Si)[ 1 ] ; Yuan, JQ (Yuan, Jiaqi)[ 1 ]
1School of Nuclear Science and Technology, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China
abstract
The AP1000 is a strong candidate to participate in grid frequency stability because of its better transient
response capability. The investigations are essential to sort the behavior of activated corrosion products
(ACPs) under frequency control induced power transients. This paper seeks to assess the variation of ACPs
in the primary coolant circuit of AP-1000 under base-load as well as grid frequency stability modes. The
computer program CPA-AP1000 is modified to incorporate frequent power fluctuations. The simulation
results depicted that short-lived ACPs (56Mn, 24Na) build up fairly rapidly whereas long-lived 59Fe, 99Mo, 58Co and 60Co exhibited slow rise, under customized base-load mode. All of the ACPs are noticed
to attain a saturation value of specific activity after several hours of the reactor operation. The corresponding
ACPs (56Mn, 24Na, 59Fe, 58Co, 99Mo and 60Co) in the primary coolant under frequency fluctuation
mode, are noted to be governed by the rise and fall in operating power level. The investigations are
extended to compare the variation in the behavior of 56Mn, 24Na, 58Co, and 60Co in primary coolant
and on the inner walls of piping and core structure, under the grid frequency stability mode. The activity
due to corresponding ACPs is the highest inside the core followed by the coolant and piping structure. The
results revealed that activity associated with ACPs with shorter half-lives is more susceptible to power
oscillations, as compared to those having longer half-lives. The post-fluctuation activity of corresponding
ACPs is also explored and found to be significantly dependent on the final and post-fluctuated power
levels. The long-term dose of ACPs with longer half-lives is found to be more significant, because their
activity holds for an extended spell. This study provides a good insight into on-power accessibility of
the primary coolant circuit for recurrently happening operating scenarios.
article info
Article history:
Received 3 July 2018
Received in revised form 7 September 2018
Accepted 16 October 2018
Available online 30 October 2018
Keywords:
Activated corrosion products
Specific activity
Primary coolant circuit
Power transients
CPA-AP1000
DOI: 10.1016/j.anucene.2018.10.031 |
(创新港)
