pressure
Streamline
Pump
Core
Steam
Concrete
Turbine
generator
producing
electricity
Pump
Steel
vessel
containment structure
Steam generator
Control rods
Condenser

cooling water

taking waste heat

to the environment

FIGURE 3.2 PWR—A common type of LWR. (Adapted from “Nuclear power reactors,”
a document of World Nuclear Association, July 2013.)
Load
Turbine
Generator
Rock layers
Production
Injection

well
well

(a)
FIGURE 3.3 Three methods of recovering geothermal energy: (a) dry steam. (Adapted
from Union of Concerned Scientists, How Geothermal Energy Works, Union of Concerned
Scientists, Cambridge, MA, 2012; National Renewable Energy Laboratory. Planta Solar 20.
http://www.nrel.gov/csp/solarpaces/project_detail.cfm/projectID=39.)