Performance analysis of integrated Nuclear-Solar Energy system sharing same molten salt thermal energy storage

• Published in: Progress in nuclear energy (New series) Vol. 171; no. C; p. 105166
• Main Authors: Soto, G.J., Wagner, M.J., Neises, T.W., Lindley, B.A.
• Format: Journal Article
• Language: English
• Published: United Kingdom Elsevier Ltd 01.06.2024; Elsevier
• ISSN: 0149-1970; 1878-4224
• DOI: 10.1016/j.pnucene.2024.105166

Advanced nuclear reactors may be deployed with integrated thermal energy storage to improve flexibility and maximize revenue. This presents opportunities for thermal integration with concentrating solar power (CSP) to generate component synergies and/or improve performance. In this study, a computational model is developed for an integrated nuclear and CSP system that both share the same molten salt thermal energy storage (TES). Optimized dispatch schedules are developed subject to various market conditions, and the ratio of the nuclear to CSP thermal output is also varied. Performance of the combined system is compared to separate nuclear and solar plants, to determine if there is an overall benefit that can be derived from sharing the TES. Given sufficient volatility in electricity prices (e.g., under CAISO market conditions), synergies of up to 8% in net revenue are observed as a result of sharing the same TES, primarily due to improved revenue from enabling operation of the turbine closer to its design point, as well as being able to better take advantage of higher electricity prices. The synergy benefits are largest when the nuclear and solar plants have similar thermal output. However, when prices are less volatile the opposite behavior can be observed and it can be preferable to operate the nuclear plant as a baseload generator.