Construction layout for caverns of underground nuclear power plant

A construction layout for caverns of an underground nuclear power plant in a mountain having a longitudinal direction, the construction layout comprising:

• two primary caverns accommodating nuclear reactor powerhouses, combined caverns, electric powerhouse caverns, pressure relief caverns, a first primary traffic tunnel, a second primary traffic tunnel, a third primary traffic tunnel, a top adit system, and a ground adit system;
• wherein
• a connecting line of medial axes of the two primary caverns accommodating nuclear reactor powerhouses is perpendicular to the longitudinal direction of the mountain;
• each combined cavern is disposed on one side of each of the two primary caverns along the longitudinal direction of the mountain;
• each electric powerhouse cavern and each pressure relief cavern are disposed on two sides of each of the two primary caverns perpendicular to the longitudinal direction of the mountain;
• each electric powerhouse cavern is perpendicular to the longitudinal direction of the mountain;
• the first primary traffic tunnel and the third primary traffic tunnel are disposed along the longitudinal direction of the mountain on outer sides of the two combined caverns, respectively;
• the second primary traffic tunnel is disposed along the longitudinal direction of the mountain between the two combined caverns;
• one end of each of the first primary traffic tunnel, the second primary traffic tunnel, and the third primary traffic tunnel communicates with a ground surface;
• the two primary caverns, the combined caverns, the electric powerhouse caverns, and the pressure relief caverns form a cavern group of a nuclear island powerhouse of the underground nuclear power plant;
• and
• a skewback or an endwall of an arch crown of each cavern of the cavern group communicates with the ground surface via the top adit system;
• and a bottom of a sidewall or a bottom of an endwall of each cavern of the cavern group communicates with the first primary traffic tunnel, the second primary traffic tunnel, and the third primary traffic tunnel via the ground adit system.