U.S. Reactor Containment Technology: a Compilation of Current Practice in Analysis, Design, Construction, Test, and Operation, Volume 1 Page: 1-34
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ORNL Dwg. 64-1985
OUTLET TURBINE CONDENSER
M PRIMARY SYSTEM CONDITIONS
PUMP 2150 PSIA
Fig. 1.4. Pressurized-Water Reactor.
Since the primary coolant passes through the core vessel, it absorbs
neutrons that cause some induced radioactivity. Small amounts of fission
products may also be present if there are any fuel element cladding rup-
tures. Cleanup facilities are provided that limit the fission-product
buildup in the primary coolant. The secondary coolant, which is sepa-
rated from the core by an additional barrier (the steam generator), does
not contain radioactivity except in the event of a heat exchanger leak.
The primary system components and the steam generator are enclosed in
some type of containment vessel to prevent large quantities of fission
products from being released to the atmosphere in case of a reactor ac-
cident. Most often the turbine and other secondary system equipment are
located outside the container. Isolation or block valves in those por-
tions of the secondary loop that penetrate the container are essential
parts of the containment system.
High-pressure containment has been used quite generally for pres-
surized-water plants because of the large amount of stored energy inher-
ent with these reactors. Pressure-suppression or pressure-relief also
may be adapted to contain this type of reactor.
184.108.40.206 Boiling-Water Reactors
The boiling-water direct-cycle reactor is shown schematically in
Fig. 1.5. In this cycle, water is converted directly to steam in the
core, eliminating the need for a heat exchanger for steam generation.
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Cottrell, William B. & Savolainen, A. W. U.S. Reactor Containment Technology: a Compilation of Current Practice in Analysis, Design, Construction, Test, and Operation, Volume 1, report, August 1965; Oak Ridge, Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc101033/m1/62/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.