Coordination Control of SMR-Based NSSS Modules Integrated by Feedwater Distribution

Due to its strong safety feature, the small modular reactor whose electric output is no more than 300MWe has been seen as a promising trend in nuclear engineering. By adopting multi-modular scheme, i.e. the superheated steam flows produced by multiple SMR-based nuclear heating system (NSSS) modules...

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Bibliographic Details
Published in:IEEE transactions on nuclear science 2016-10, Vol.63 (5), p.2682-2690
Main Authors: Dong, Zhe, Song, Maoxuan, Huang, Xiaojin, Zhang, Zuoyi, Wu, Zongxin
Format: Article
Language:English
Subjects:
Feedwater distribution
flowrate-pressure control
fluid flow network (FFN)
Hafnium
Helium
Inductors
Mathematical model
module coordination
multi-modular nuclear plant
Product design
Pumps
Safety
Valves
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Summary:Due to its strong safety feature, the small modular reactor whose electric output is no more than 300MWe has been seen as a promising trend in nuclear engineering. By adopting multi-modular scheme, i.e. the superheated steam flows produced by multiple SMR-based nuclear heating system (NSSS) modules are combined to drive a common thermal load, the strong safety feature of a SMR can be applied to large-scale nuclear plants. To improve the economic competitiveness, it is meaningful to integrate multiple NSSS modules by the scheme of feedwater distribution, i.e. sharing a common pump and distributing feedwater by adjusting the opening of regulating valve of each module. The module coordination control of multiple SMR-based NSSS modules coupled by feedwater distribution is essentially the flowrate-pressure control of the common secondary-loop fluid flow network (FFN). In this paper, the nonlinear differential-algebraic model for the FFNs with a single feedwater pump is first given. A novel distributed adaptive flowrate-pressure control is proposed, which is then applied to realize the module coordination. Numerical simulation results in the case of coordination control of two MHTGR-based NSSS modules integrated by feedwater distribution scheme show the feasibility as well as the satisfactory transient performance of this newly-built coordination control law.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2016.2601342