BALANCE OF PLANT | STEAM GENERATOR CONTROLS
Electric main
feed water pump 1
Differential pressure gauge 1
Right, figure 2: System structure diagram of main feed pump speed regulation system
Differential pressure gauge 2
Differential pressure gauge 3
Input/ouput module group 1
Processor module 3A
Input/ouput module group 2
Electric main
feed water pump 2
Input/ouput module group 3
Processor module 3B
Electric main
feed water pump 3
Improving steam generator
control reliability A new method for dynamic reliability modelling and quantitative analysis of DICS based on BDMP and PRISM is proposed as a way of solving the problems of large model scale and combined explosion in traditional dynamic reliability analysis methods. In this case, BDMP is first applied to the complex control
system of an actual nuclear power plant. Firstly, the proposed method was used to analyse the availability of SGLCS in an actual NPP. Then, the proposed method was compared with the results obtained by commercial BDMP modeling and quantitative analysis software KB3 and YAMS. The relative deviation of the proposed method is less than 2%, which verifies the effectiveness of the method. The final calculation results show that without regular inspection, the unavailability rate of SGLCS is about 1.4E-3, among which the failure of the feed water flow regulation
system (independent part) contributes the most to the unavailability rate of the system. In actual operation and maintenance, targeted strategies can thus be adopted to improve the reliability of the system. The method proposed in this paper makes the reliability modeling and quantitative analysis method of complex dynamic system feasible for popular use in engineering and provides direction and reference values for reliability management and equipment maintenance of SGLCS in nuclear power plants. ■
The authors acknowledge the support of the Scientific Research Program for Young Talents of the China National Nuclear Corporation. The work is also co-funded by Equipment pre-research Key Laboratory Fund project and Special funds for basic scientific research operating expenses of central universities.
1.1 1.2 1.3 1.4 1.5
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
0 0 1
x10-3
1.1 1.2
PRISM results YAMSresults
0.9 1
0.8
1.0 1.5 2.0 2.5 3.0 3.5 T/h
4 x104
0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
Independent part Common part
Main feed pump speed regulation system
x10-3
0
1
1.0 1.5 2.0 2.5 3.0 3.5 T/h
Above left, figure 3: Comparison diagram of unavailablity rate of SGLCS Above right, figure 4: Three-part unavailability diagram of SGLCS
34 | August 2023 |
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4 x104
Unavailability rate
Unavailability rate
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