We briefly introduce the general layout plan and layout scheme in the conceptual design of two underground nuclear power plants that are located in mountainous and hilly area respectively. Aiming at two layout alternatives for A site in mountain-ous area, terrace-level buried and buried under terrace, through comparing excavation supporting cost and circulating water sup-plement cost, and by comprehensively taking in account of the water supply reliability, access roads and transport cost, the influ-encing factors of underground cavities stability and main steam pipe length, construction factors, we suggest terrace-level buried scheme for the A site. Aiming at terrace-level buried layout of A site in mountainous area and B site in hilly area, we also con-duct investment comparative study. It demonstrates that construction of underground nuclear power plant in the hilly area are more likely to get enough ground platform, and smaller excavation quantities, as well as several advantages such as lower lifting head of circulation water, lower water lifting cost and relatively high reliability of water supply, simple road construction and low transpor-tation cost. So in the hilly area, the terrace-level buried layout form is superior to the buried under terrace layout, which should be chose in priority.%简要介绍了山区和丘陵地区示范性概念设计地下核电厂址总体规划和总平面布置方案. 通过比较山区概念设计A厂址阶地平埋、阶地下埋布置方案的土石方开挖支护费用、循环水补水费用等,并综合考虑取水可靠性、道路及运输成本、洞室群稳定性影响因素、主蒸汽管道长度、施工等因素,A厂址推荐采用阶地平埋布置方案. 对山区A厂址和丘陵地区B厂址阶地平埋布置方案主要费用的对比研究表明,在丘陵地区建设地下核电站更容易获得足够大的地面平台且土石方开挖工程量小;循环水补水扬程低,提水费用低,取水可靠性相对较高;道路施工相对简单,运输成本低;在丘陵地区地下核电站建设应优先选择阶地平埋布置形式.
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