Solid Radioactive Waste Strategy Report.pdf - UK EPR
Solid Radioactive Waste Strategy Report.pdf - UK EPR
Solid Radioactive Waste Strategy Report.pdf - UK EPR
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<strong>EPR</strong> <strong>UK</strong><br />
N° NESH-G/2008/en/0123<br />
REV. A PAGE 143 / 257<br />
Dry storage in concrete storage modules (e.g. NUHOMS® )<br />
NUHOMS® is a proven system for dry storage which has been in use at reactor sites since<br />
March 1989. The NUHOMS® system provides containment, shielding, criticality control and<br />
passive heat removal independent of any other facility structures or components.<br />
NUHOMS (NUTECH Horizontal Modular Storage) technology involves:<br />
· A Dry Shielded Canister (DSC) is inserted inside a site transfer cask;<br />
· Placing spent fuel in a Dry Shielded Canister (DSC) underwater;<br />
· The DSC is drained, sealed, vacuum-dried and filled with helium (line removed);<br />
· The transfer cask is placed in a horizontal position on a transport trailer and moved to<br />
the HSM site;<br />
· The cask including the loaded DSC is used to transport the spent fuel to the interim<br />
storage facility;<br />
· The site transfer cask is aligned with a Horizontal Storage Module (HSM). The HSMs are<br />
massive concrete structures and provide shielding and security for safe interim storage;<br />
· The DSC is pushed out of the site transfer cask and into the HSM;<br />
· The HSM is sealed and the site transfer cask reused to transfer other DSCs.<br />
The HSM provides radiological shielding and physical protection for the Canister against a wide<br />
range of postulated natural hazards. The Module has internal air flow passages to provide<br />
natural convection cooling for removal of decay heat from the Canister’s spent fuel.<br />
FIGURE 53: THE NUHOMS SYSTEM
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