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Egypt Engineering Consultant Chemical & Nuclear study materials
Egypt Engineering Consultant Chemical & Nuclear study resources

Egypt Engineering Consultant Chemical & Nuclear: Nuclear Fuel Cycle, Waste Management and Decommissioning

Egypt Engineering Consultant Chemical & Nuclear · Work through your exam, one topic at a time.

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Nuclear Fuel Cycle, Waste Management and Decommissioning

Nuclear Fuel Cycle, Waste Management and Decommissioning covers the front end from mining to fuel fabrication, the back end from storage to disposal, waste classification, and the decommissioning process, including Egypt's institutional arrangements.

Front end

  • Uranium ore is milled to U3O8 (yellowcake), converted to UF6, enriched by gas centrifuge measured in separative work units (SWU), then fabricated into UO2 fuel.
  • Enrichment mass balance: F = P + T and F x_F = P x_P + T x_T. SWU rises steeply as the tails assay falls, so the economic optimum tails assay (about 0.1–0.25% U-235) balances enrichment against uranium cost.
  • PWR fuel is typically 3–5% U-235 with burnup of 40–60 GWd/tU.

Back end and waste

  • Spent fuel cools in pools for years (decay heat falls roughly as t^−0.2), then moves to dry storage.
  • Closed cycle: PUREX separates U and Pu and the fission-product raffinate is vitrified. Once-through cycle: direct disposal of the assembly.
  • IAEA waste classes: exempt, very short-lived, very low level, low level, intermediate level, high level; the class determines the disposal route.
  • Decommissioning options are immediate dismantling, deferred dismantling and entombment; IAEA GSR Part 6 governs the process, including clearance of material below release criteria.
  • Egypt: Law 7/2010 covers waste and decommissioning; the Inshas site hosts EAEA facilities and research reactors; ENRRA licenses waste management and decommissioning; El Dabaa stores spent fuel on site.

Worked example - burnup

A 3000 MWt core runs 365 days at 90% capacity factor: 3000 × 365 × 0.9 = 985,500 MWd. With 72 tU loaded, burnup = 985,500/72 ≈ 13,700 MWd/tU, i.e. 13.7 GWd/tU - a low-burnup first-cycle figure. At 1.05 g U-235 per MWd, about 1.03 t of U-235 was fissioned.

Traps

  • Setting the tails assay to zero and ignoring the SWU penalty.
  • Mixing MWd/tU and GWd/tU within one answer.
  • Treating all spent fuel as HLW without considering the reprocessing option.
  • Overlooking the clearance route for lightly contaminated decommissioning waste.