Waste to Cell Pipeline

From reactor spent fuel to completed Spectrum Energy Cell · Three processing tiers · Bill of materials
© 2026 David R. Young — Spectrum Energy Research Corp
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WASTE → FUEL → CELL → HOME SPENT FUEL Cooling pools · Dry casks ~86,000 metric tons in US storage Composition: ~95% U-238 (inert bulk) ~3% fission products (the fuel) ~1% Pu + minor actinides ~1% remaining U-235 PROCESSING Three tiers — choose cost vs size TIER A — Raw Spent Fuel Minimal processing · chop + encapsulate Source: ~5-10 kg spent fuel Unit size: shipping container Cost: lowest (fuel = negative cost) ⚠ Needs criticality-safe geometry Best for: industrial, agricultural, district TIER B — Concentrated FP Separate fission products from U-238 bulk Source: ~300-500g concentrated FP Unit size: large chest freezer Cost: moderate (bulk separation) ★ Best balance: cost vs size Best for: residential, commercial TIER C — Pure Isotope Full separation: Cs-137, Sr-90, or Am-241 Source: ~120g Cs-137 or equivalent Unit size: mini fridge (w/ conduit) Cost: highest (PUREX chemistry) Cleanest operation · no criticality concern Best for: residential, portable, marine REMAINING WASTE Without Cs/Sr: cooler, shorter-lived, easier to store SE CELL ASSEMBLY Concentric layers · atmospheric model L1 · SOURCE CAPSULE Cs-137 / Sr-90 / mixed FP · sealed L2 · SiC BETAVOLTAIC SiC · 3.21 g/cm³ · ~50-100g L3 · HIGH-Z ABSORBER W-Ni-Fe 17.5 g/cm³ · 50-150 kg L4 · CdTe / CZT DETECTOR CdTe 5.85 g/cm³ · ~200-500g L5 · SCINTILLATOR NaI(Tl) or LYSO:Ce · ~1-3 kg L6 · PHOTOVOLTAIC InGaP/GaAs · ~200-500g L7 · THERMOELECTRIC PbTe or SiGe · ~300-800g L8 · SAFE OUTER SHELL Steel housing · thermal ports · fiber ports L3 shielding = 95%+ of total mass DEPLOYED Installed · producing · off-grid SE CELL Utility closet chest freezer size ⚡ ~650W electrical Battery · appliances · cooking peaks 🔥 ~500W thermal AC · hot water · heating · fridge 💡 visible light Fiber optic to all rooms LIFECYCLE Cs-137: runs 30 years, lower power Co-60: runs 5 years, higher power Swap capsule · keep the cell forever END STATE Cs-137 → Ba-137 (stable barium) Sr-90 → Zr-90 (stable zirconium) Waste becomes inert. Problem solved. The fuel already exists · it's already refined · someone is already paying to store it · the SE Cell turns a liability into an asset
Bill of Materials — Tier B Home Unit
Concentrated fission product source · ~850W total · chest freezer size
L1 · Source capsule~300-500g conc. FP
L2 · SiC betavoltaic wafers~50-100g
L3 · W-Ni-Fe shielding~100-150 kg
L4 · CdTe detector array~200-500g
L5 · NaI(Tl) scintillator~1-3 kg
L6 · InGaP/GaAs PV cells~200-500g
L7 · PbTe or SiGe thermoelectric~300-800g
L8 · Steel housing + ports~10-20 kg
Heat exchanger + hydronic~5-10 kg
Fiber optic bundles~0.5-1 kg
Electronics + inverter~2-5 kg
TOTAL UNIT MASS~120-190 kg
Shielding (L3) dominates. With crystal conduit: ~60-95 kg total.
Spent Fuel Available in US
Total stored: ~86,000 metric tons

Fission product fraction: ~3% = ~2,580 tons

Cs-137 content: ~6.1% of FP = ~157 tons

Sr-90 content: ~5.7% of FP = ~147 tons

SE Cells from existing waste:
At 120g Cs-137 per home unit:
157,000 kg ÷ 0.12 kg = ~1.3 million home units

At 500g concentrated FP per unit:
2,580,000 kg ÷ 0.5 kg = ~5 million home units

Existing US waste could power millions of homes while eliminating the storage problem.
Three Tiers Compared
Tier A Tier B Tier C
Processing Chop + seal Bulk separate Full PUREX
Source mass 5-10 kg 300-500g 120g
Unit size Container Chest freezer Mini fridge*
Shielding ~500+ kg ~100-150 kg ~50-80 kg
Fuel cost Negative Low Highest
Criticality Must manage Minimal risk None
Best for Industrial Residential Portable
* With crystal conduit (future)
"86,000 metric tons of spent fuel sit in storage across the United States. Someone is paying billions to keep it cool and contained. That fuel contains the Cs-137, Sr-90, and Am-241 that the Spectrum Energy Cell needs. Extracting them solves two problems at once: the waste becomes safer to store, and millions of homes get perpetual, grid-free power. The fuel is already mined, already refined, and already paid for. The SE Cell turns a national liability into a national asset."
Separation technology: PUREX (Plutonium Uranium Reduction Extraction) and variants are well-established reprocessing methods. France, UK, Russia, Japan, and India operate commercial reprocessing facilities. The US suspended civilian reprocessing in 1977 (Carter administration) but the technology exists and is used for defense purposes.

Cs-137 yield: ~6.1% of fission products by mass. One of the most abundant and problematic isotopes in spent fuel. Half-life 30.17 years. Decays to stable Ba-137. Gamma emitter — ideal for the scintillator conversion chain.

Sr-90 yield: ~5.7% of fission products by mass. Half-life 28.8 years. Pure beta emitter (no gamma — less shielding needed). Daughter Y-90 provides additional high-energy beta. Decays to stable Zr-90.

Material estimates: Masses are engineering approximations for a home-scale unit producing ~850W total. Shielding mass varies significantly with source activity, geometry, and crystal conduit availability. Converter layer masses are small — the technology exists at these scales today in medical and industrial detectors.

© 2026 David R. Young — Spectrum Energy Research Corp · Spectrum Energy Research Framework · All Rights Reserved