Solid Radioactive Waste Strategy Report.pdf - UK EPR

EPR UK
N° NESH-G/2008/en/0123
REV. A PAGE 118 / 257
TABLE 36: 3 CUBIC METRE BOX WITH 100 MM STEEL SHIELDING CHARACTERISTICS
FOR METALLIC WASTE
Nature of waste stream:
Lower & upper internals from EPR pressure vessel: Core barrel,
Upper core plate, Flow distribution device, Upper support column (under
upper support plate).
Raw waste volume: About 11 m 3
Proposed matrix:
Package type:
Raw waste per package:
Mortar matrix
NDA specification 3 cubic metre Box with 100mm internal steel shielding
Additional transport shielding SWTC-285, described in the NDA Generic
Waste Package Specification, is needed.
1.3 ton per package (limited by package heat output).
Waste form density: 2800 kg\m 3 (r stainless steel =7850kg/m3 & r grout =2300kg/m 3 )
Derivation of case:
DARWIN PEPIN calculation with representatives flux in the reactor
vessel
Reference date: At shut down (years 65)
Total package activity:
Waste classification:
(based on mass of wasteform)
External gamma dose rates:
3 cubic metre Box with 100mm shielding: 2000 TBq βγ
>12 000 Bq/g - ILW
3 cubic metre Box with 100mm shielding:
9.2E8 Bq/g < Activity βγ < 1.6E9 Bq/g
At 1m: < 0.1 mSv/h
At contact: < 2 mSv/h
From the transport container SWTC 285.