Solid Radioactive Waste Strategy Report.pdf - UK EPR

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EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 110 / 257 FIGURE 30: 3M 3 BOX CORNER LIFT VARIANT FIGURE 31: 3M 3 BOX MID-SIDE LIFTING VARIANT All these metallic wastes will be encapsulated in a cement grout. Note: after interim storage, concrete wastes resulting from the dismantling of the reactor compartment are at worst classified LLW.
EPR UK N° NESH-G/2008/en/0123 REV. A PAGE 111 / 257 TABLE 31: 4 M 3 WITH 100 MM CONCRETE SHIELDING CHARACTERISTICS Nature of waste stream: Reactor vessel: Parts from the reactor vessel (cladding included) near the core Raw waste volume: About 23 m 3 Proposed matrix: Package type: Raw waste per package: Mortar matrix NDA specification 4 metre Box with 100 mm concrete shielding 18 to 22 tonnes per package (limited by filing ratio) Waste form density: 3140 to 3320 kg\m 3 (r stainless steel =7850 kg/m 3 & r grout =2300 kg/m 3 ) Waste package mass: 61 to 64 tonnes m package = m 4 meter Box + m immobilised grout + m steel waste + m concrete shielding Number of packages: About 10 Physical/chemical composition: The waste in an average package by weight is expected to comprise: – 40% of ferritic steel waste, – 2% of stainless cladding steel waste, – 58% of mortar. Derivation of case: DARWIN PEPIN calculation with representatives flux in the reactor vessel Reference date: After interim storage (year 100) Total package activity: Waste classification: (based on mass of wasteform) External gamma dose rates: 4 metre Box: 1.36 TBq βγ >12 000 Bq/g - ILW 4 metre Box: 7.6 E 4 Bq/g βγ At 1m: < 0.1 mSv/h At contact: < 2 mSv/h From the package.
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A 2008-11-26 Sarah Greenwood Gary C
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