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Research Papers

Analyses of the Control System Strategies and Methodology for Part Power Control of the Simple and Intercooled Recuperated Brayton Helium Gas Turbine Cycles for Generation IV Nuclear Power Plants

[+] Author and Article Information
A. Gad-Briggs

Gas Turbine Engineering Group,
Cranfield University,
Cranfield MK43 0AL, Bedfordshire, UK
e-mail: a.a.gadbriggs@cranfield.ac.uk

P. Pilidis

Gas Turbine Engineering Group,
Cranfield University,
Cranfield MK43 0AL, Bedfordshire, UK
e-mail: p.pilidis@cranfield.ac.uk

T. Nikolaidis

Gas Turbine Engineering Group,
Cranfield University,
Cranfield MK43 0AL, Bedfordshire, UK
e-mail: t.nikolaidis@cranfield.ac.uk

Manuscript received December 22, 2016; final manuscript received May 10, 2017; published online July 31, 2017. Assoc. Editor: John F. P. de Grosbois.

ASME J of Nuclear Rad Sci 3(4), 041016 (Jul 31, 2017) (9 pages) Paper No: NERS-16-1170; doi: 10.1115/1.4036737 History: Received December 22, 2016; Revised May 10, 2017

An important requirement for Generation IV Nuclear Power Plant (NPP) design is the control system, which enables part power operability. The choices of control system methods must ensure variation of load without severe drawbacks on cycle performance. The objective of this study is to assess the control of the NPP under part power operations. The cycles of interest are the simple cycle recuperated (SCR) and the intercooled cycle recuperated (ICR). Control strategies are proposed for NPPs but the focus is on the strategies that result in part power operation using the inventory control method. First, results explaining the performance and load limiting factors of the inventory control method are documented; subsequently, the transient part power performances are also documented. The load versus efficiency curves were also derived from varying the load to understand the efficiency penalties. This is carried out using a modeling and performance simulation tool designed for this study. Results show that the ICR takes ∼102% longer than the SCR to reduce the load to 50% in design point (DP) performance conditions for similar valve flows, which correlates with the volumetric increase for the ICR inventory tank. The efficiency penalties are comparable for both cycles at 50% part power, whereby a 22% drop in cycle efficiency was observed and indicates limiting time at very low part power. The analyses intend to aid the development of cycles for Generation IV NPPs specifically gas cooled fast reactors (GFRs) and very high-temperature reactors (VHTRs), where helium is the coolant.

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Figures

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Fig. 3

SCR with inventory pressure control schematic

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Fig. 4

Compressor map showing corrected speed lines and contours of efficiency [24]

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Fig. 5

Effect of mass change on cycle and tank pressures

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Fig. 6

Transient part power performance (T1 at DP)

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Fig. 7

Part power versus plant cycle efficiency curves (T1 at DP)

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