Reactivity disturbance suppression method for small modular reactors based on core coolant flow control

Small modular reactors (SMR) have an exceptionally wide range of applications due to their flexibility. But the reactivity of SMR is more susceptible to disturbance than that of large commercial reactors, which may cause the core power to deviate from the set value, and the limited internal space ma...

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Bibliographic Details
Published in:Scientific reports 2022-09, Vol.12 (1), p.14950-14950, Article 14950
Main Authors: Xie, Hongyun, Duan, Qizhi, Ping, Jialin, Lu, Chao, Zhang, Liming, Li, Shuqiang
Format: Article
Language:English
Subjects:
639/166/4073
639/4077/4091/4093
Humanities and Social Sciences
multidisciplinary
Science
Science (multidisciplinary)
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Summary:Small modular reactors (SMR) have an exceptionally wide range of applications due to their flexibility. But the reactivity of SMR is more susceptible to disturbance than that of large commercial reactors, which may cause the core power to deviate from the set value, and the limited internal space makes it difficult for SMR to compensate or adjust for reactivity disturbance by setting a sufficient number of control rods as in large commercial reactors. Therefore, in order to improve the operational stability of SMR, a method is proposed to indirectly change the nuclear fuel temperature by adjusting the coolant flow rate and thus compensate the reactivity disturbance by the Doppler effect of nuclear fuel resonance absorption. Simulation experiments show that the method can effectively eliminate reactive disturbances that cannot be completely eliminated by control rods under the conditions of restricted SMR space and limited number of control rod sets, thus providing operational stability of SMR.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-19243-z