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 117 / 257<br />
TABLE 35: 4 METRE BOX WITH 400 MM CONCRETE SHIELDING CHARACTERISTICS<br />
FOR METALLIC WASTE<br />
Nature of waste stream:<br />
Raw waste volume: About 29 m 3<br />
Reactor vessel: Parts from the reactor vessel (cladding included) near<br />
the core<br />
Proposed matrix:<br />
Package type:<br />
Raw waste per package:<br />
Mortar matrix<br />
NDA specification 4 metre Box with 400 mm concrete shielding<br />
7.4 to 10.6 per package (limited by filling ratio).<br />
<strong>Waste</strong> form density: 3140 to 3500 kg\m 3 (r stainless steel =7850 kg/m 3 & r grout =2300 kg/m 3 )<br />
<strong>Waste</strong> package mass:<br />
54 to 56 tonnes<br />
m package = m 4 meter Box + m immobilised grout + m steel waste + m concrete shielding<br />
Number of packages: About 28<br />
Physical/chemical composition:<br />
The waste in an average package by weight is expected to comprise:<br />
– 38% of ferritic steel waste,<br />
– 2% of stainless steel waste,<br />
– 60% of mortar.<br />
Derivation of case:<br />
DARWIN PEPIN calculation with representatives flux in the reactor<br />
vessel<br />
Reference date: At shut down (years 65)<br />
Total package activity:<br />
<strong>Waste</strong> classification:<br />
(based on mass of wasteform)<br />
External gamma dose rates:<br />
4 metre Box with 400mm internal concrete shielding: 10.7 TBq βγ<br />
>12 000 Bq/g - ILW<br />
4 metre Box with 400mm internal concrete shielding: 1.33 E6 Bq/g<br />
βγ<br />
At 1m: < 0.1 mSv/h<br />
At contact: < 2 mSv/h<br />
From the package.
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