U.S. Reactor Containment Technology: a Compilation of Current Practice in Analysis, Design, Construction, Test, and Operation, Volume 1 Page: 1-46
The following text was automatically extracted from the image on this page using optical character recognition software:
A type of containment employing a form of pressure suppression is
effected in systems that employ a water spray within the containment
structure as a means of limiting the pressures attained therein. Such
an arrangement would be most effective where the condensable vapor was
released over a period of time, since sudden releases would not allow
time for suppression of the pressure.
Pressure-suppression containment systems consisting of separate dry-
well and wet-well volumes are commonly employed with boiling-water reactor
systems. All plants have some portions of the dry-well and suppression
chamber in a vented building containment system, and, as shown in Fig.
1.16 (sec. 1.4.4), the entire plant may be contained in a vented building.
This system represents a logical extension of the concept that is known
as "multiple containment." Pressure suppression appears to be most suited
to boiling-water reactor systems because the boiling-water system, ex-
clusive of the turbine, can be enclosed in the relatively small dry-well.
1.4.3 Pressure-Release Containment
In the pressure-release method of containment the pressure in the
containment structure is relieved by venting to the atmosphere. This
venting is limited, in some systems, to the period of the primary (or
secondary) system blowdown and, in others, may extend over the course
of the accident. The former case is commonly called "pressure-relief"
containment and the latter is variously described as "confinement,"
"vapor-venting," "pressure-venting," "building-type," or in some appli-
cations, "negative-pressure" containment. For the purposes of the sub-
sequent discussion, the two types will be called pressure relief (where
the pressure is relieved only during the initial release from the acci-
dent) and pressure venting (where the contained volume is more or less
continuously vented, often through filters, during the course of the ac-
cident in order to maintain a given pressure within the contained volume).
In either case, the suitability of this containment technique is
critically dependent on the amount of fission products that are released
to the atmosphere during the release period. Air-cleaning systems so far
proposed for such applications do not provide for the efficient removal
of radioactive noble gases and some forms of other fission products such
as methyl iodide, and this would be an important consideration in the
use of such systems.
220.127.116.11 Pressure-Venting Containment
Although the containment atmosphere is more or less continuously
discharged to the outside, it is generally discharged through a stack
and then only after the fission-product contamination in the discharge
effluent has been reduced to acceptable levels by filters, scrubbers,
or both techniques. The success of this type of containment, shown
schematically in Fig. 1.12, is often dependent upon the effectiveness
of the cleanup system in maintaining a safe level of activity in the
effluent and the ability to maintain the exhaust rate high enough to
Here’s what’s next.
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
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/m1/74/: accessed March 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.