23.04.2013 Views

Management of Commercially Generated Radioactive Waste - U.S. ...

Management of Commercially Generated Radioactive Waste - U.S. ...

Management of Commercially Generated Radioactive Waste - U.S. ...

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

81<br />

CONSEQUENCE ANALYSIS<br />

discussion <strong>of</strong> why these sequences are important .except to say that they are "believed most<br />

representative" <strong>of</strong> release events. How these events were chosen and why they are believed<br />

to be representative and to bound the impact <strong>of</strong> long-term consequences should be discussed.<br />

(208-NRC)<br />

Response<br />

As described in DOE/ET-0028 and DOE/ET-0029, an umbrella source term concept was used<br />

to limit the number <strong>of</strong> accidents requiring detailed impact analysis. Viewed independently<br />

<strong>of</strong> accident initiation sequences and frequencies, the accident source terms can be grouped<br />

by release severity for environmental consequence analyses. Release groups were defined<br />

based on similar release pathways, chemical form, accident severity, and isotope types<br />

released. The umbrella source term was that accident having the largest release in a par-<br />

ticular group <strong>of</strong> accidents.<br />

The information below lists those postulated accidents (for geologic repositories)<br />

examined in this Statement and notes the umbrella source term.<br />

Minor Umbrella Source Term<br />

LLW drum rupture due to handling error<br />

Minor canister failure X<br />

Receipt <strong>of</strong> externally-contaminated canister<br />

Dropped shipping cask<br />

Moderate<br />

<strong>Waste</strong> container drop during handling<br />

<strong>Waste</strong> package dropped down mine shaft X<br />

Tornado strikes mined materials storage area X<br />

LLW drum rupture due to mechanical damage and fire<br />

LLW drum rupture due to internal explosion<br />

Non-Design Basis<br />

Nuclear warfare<br />

Repository breach by meteorite X<br />

Repository breach by drilling X<br />

Repository breach by solution mining X<br />

Volcanism<br />

Repository breach by faulting with groundwater<br />

transport X<br />

Erosion<br />

Criticality

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!