Rough sketch of a typical Boiling water reactor (BWR) Mark I Concrete Containment with Steel Torus including downcomers, as used in the BWR/1, BWR/2, BWR/3 and some BWR/4 model reactors. The primary containment is outlined in purple.
<ul><li>DW = Drywell</li>
<li>WW = Wetwell</li>
<li>SF = Spent Fuel Pool</li>
<li>light blue with pink dome = Reactor Pressure Vessel</li>
<li>purple = Secondary Concrete Shield Wall</li></ul>
<a href="//commons.wikimedia.org/wiki/User:84user" title="User:84user">User:84user</a>
2011-04-04
Sketched in Paint.net using 826 x 852 canvas inspired by Page 15 (pdf: 40), Containment Integrity Research at Sandia National Laboratories - An Overview, Manuscript completed: March 2006, Published: July 2006, id: NUREG/CR-6906 and SAND2006-2274P <a rel="nofollow" class="external autonumber" href="https://www.nrc.gov/reading-rm/doc-collections/nuregs/contract/cr6906/cr6906.pdf">[1]</a> - Prepared by Sandia National Laboratories for the U.S. Nuclear Regulatory Commission, Job Code Y6757. The two diagrams on the same page are labeled: <i>Figure 5 Typical BWR Mark I Concrete Containment with Steel Torus</i>.