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Mar 26, 2026 · 35m · catalyst

The state and future of nuclear waste

Dr. Jen Shafer (Jen Schaefer) · 22m spoken Shayle Kann · 7m spoken
0:00 / 0:00

gold bands on the timeline = statements, start to end. Hover to read, click to jump. CC turns on captions

In this episode of Catalyst, host Shail Khan and nuclear expert Dr. Jen Shafer unpack the physical reality, policy deadlocks, and technological future of commercial nuclear waste in the United States. They examine spent fuel chemistry, dry cask storage, Yucca Mountain's legal stalemate, and the promise of advanced fuel cycles and deep borehole disposal.

How this conversation actually went

Every chapter scored 0–10 on four independent dynamics. Hover any point for the reasoning behind the score. Shayle holds 22.2% of the talking time here. How this is scored →

Shayle as informed peer 4.2 Guest teaching 5.4 Guest disagreement 1.2 Shayle pushing back 1.6
05100:0010:0020:0030:003:09–13:38 · Shayle as informed peer 5/10 The Chemical Reality of Spent Nuclear Fuel and Transmutation Shayle demonstrates a solid conceptual grasp of open fuel cycles and half-life dynamics, but Dr. Shafer educates him on how actinide transmutation and fast-reactor recycling actually reduce long-term geological burdens.13:39–17:34 · Shayle as informed peer 4/10 Yucca Mountain, Legal Deadlocks, and the Nuclear Waste Fund Shayle inquires about accumulated stockpiles and Yucca Mountain's failure, allowing Dr. Shafer to lay out the regulatory and legal trajectory of the Nuclear Waste Policy Act and utility lawsuits.17:37–22:47 · Shayle as informed peer 3/10 Sponsor Messages: Bloom Energy, Engie, and EnergyHub Following sponsor messaging, Shayle pushes on the physical vulnerability of spent fuel storage facilities, prompting Dr. Shafer to explain passive dry cask storage versus active cooling in spent fuel pools.22:47–29:06 · Shayle as informed peer 5/10 Advanced Reactor Designs, Waste Forms, and Micro-Reactor Logistics Shayle probes the logistical feasibility of transporting entire microreactors across state lines, while Dr. Shafer categorizes reactor fuels by waste form durability and notes state-level legal powers.29:07–34:39 · Shayle as informed peer 4/10 Long-Term Repository Prospects, Deep Boreholes, and Social Licensing Dr. Shafer walks through repository capacity math under nuclear tripling scenarios and outlines how co-located recycling facilities or deep boreholes could resolve state-level social license hurdles.3:09–13:38 · Guest teaching 6/10 The Chemical Reality of Spent Nuclear Fuel and Transmutation Shayle demonstrates a solid conceptual grasp of open fuel cycles and half-life dynamics, but Dr. Shafer educates him on how actinide transmutation and fast-reactor recycling actually reduce long-term geological burdens.13:39–17:34 · Guest teaching 5/10 Yucca Mountain, Legal Deadlocks, and the Nuclear Waste Fund Shayle inquires about accumulated stockpiles and Yucca Mountain's failure, allowing Dr. Shafer to lay out the regulatory and legal trajectory of the Nuclear Waste Policy Act and utility lawsuits.17:37–22:47 · Guest teaching 4/10 Sponsor Messages: Bloom Energy, Engie, and EnergyHub Following sponsor messaging, Shayle pushes on the physical vulnerability of spent fuel storage facilities, prompting Dr. Shafer to explain passive dry cask storage versus active cooling in spent fuel pools.22:47–29:06 · Guest teaching 6/10 Advanced Reactor Designs, Waste Forms, and Micro-Reactor Logistics Shayle probes the logistical feasibility of transporting entire microreactors across state lines, while Dr. Shafer categorizes reactor fuels by waste form durability and notes state-level legal powers.29:07–34:39 · Guest teaching 6/10 Long-Term Repository Prospects, Deep Boreholes, and Social Licensing Dr. Shafer walks through repository capacity math under nuclear tripling scenarios and outlines how co-located recycling facilities or deep boreholes could resolve state-level social license hurdles.3:09–13:38 · Guest disagreement 1/10 The Chemical Reality of Spent Nuclear Fuel and Transmutation Shayle demonstrates a solid conceptual grasp of open fuel cycles and half-life dynamics, but Dr. Shafer educates him on how actinide transmutation and fast-reactor recycling actually reduce long-term geological burdens.13:39–17:34 · Guest disagreement 1/10 Yucca Mountain, Legal Deadlocks, and the Nuclear Waste Fund Shayle inquires about accumulated stockpiles and Yucca Mountain's failure, allowing Dr. Shafer to lay out the regulatory and legal trajectory of the Nuclear Waste Policy Act and utility lawsuits.17:37–22:47 · Guest disagreement 1/10 Sponsor Messages: Bloom Energy, Engie, and EnergyHub Following sponsor messaging, Shayle pushes on the physical vulnerability of spent fuel storage facilities, prompting Dr. Shafer to explain passive dry cask storage versus active cooling in spent fuel pools.22:47–29:06 · Guest disagreement 2/10 Advanced Reactor Designs, Waste Forms, and Micro-Reactor Logistics Shayle probes the logistical feasibility of transporting entire microreactors across state lines, while Dr. Shafer categorizes reactor fuels by waste form durability and notes state-level legal powers.29:07–34:39 · Guest disagreement 1/10 Long-Term Repository Prospects, Deep Boreholes, and Social Licensing Dr. Shafer walks through repository capacity math under nuclear tripling scenarios and outlines how co-located recycling facilities or deep boreholes could resolve state-level social license hurdles.3:09–13:38 · Shayle pushing back 2/10 The Chemical Reality of Spent Nuclear Fuel and Transmutation Shayle demonstrates a solid conceptual grasp of open fuel cycles and half-life dynamics, but Dr. Shafer educates him on how actinide transmutation and fast-reactor recycling actually reduce long-term geological burdens.13:39–17:34 · Shayle pushing back 1/10 Yucca Mountain, Legal Deadlocks, and the Nuclear Waste Fund Shayle inquires about accumulated stockpiles and Yucca Mountain's failure, allowing Dr. Shafer to lay out the regulatory and legal trajectory of the Nuclear Waste Policy Act and utility lawsuits.17:37–22:47 · Shayle pushing back 2/10 Sponsor Messages: Bloom Energy, Engie, and EnergyHub Following sponsor messaging, Shayle pushes on the physical vulnerability of spent fuel storage facilities, prompting Dr. Shafer to explain passive dry cask storage versus active cooling in spent fuel pools.22:47–29:06 · Shayle pushing back 2/10 Advanced Reactor Designs, Waste Forms, and Micro-Reactor Logistics Shayle probes the logistical feasibility of transporting entire microreactors across state lines, while Dr. Shafer categorizes reactor fuels by waste form durability and notes state-level legal powers.29:07–34:39 · Shayle pushing back 1/10 Long-Term Repository Prospects, Deep Boreholes, and Social Licensing Dr. Shafer walks through repository capacity math under nuclear tripling scenarios and outlines how co-located recycling facilities or deep boreholes could resolve state-level social license hurdles.

speaking balance: gold is Shayle, purple is the guest (3 minute bins)

0:00 · Shayle 44.2% · guest 55.8%0:00 · Shayle 44.2% · guest 55.8%3:00 · Shayle 25.6% · guest 74.4%3:00 · Shayle 25.6% · guest 74.4%6:00 · Shayle 40.7% · guest 59.3%6:00 · Shayle 40.7% · guest 59.3%9:00 · Shayle 24.7% · guest 75.3%9:00 · Shayle 24.7% · guest 75.3%12:00 · Shayle 15.3% · guest 84.7%12:00 · Shayle 15.3% · guest 84.7%15:00 · Shayle 0% · guest 100%15:00 · Shayle 0% · guest 100%18:00 · Shayle 11.5% · guest 88.5%18:00 · Shayle 11.5% · guest 88.5%21:00 · Shayle 32.9% · guest 67.1%21:00 · Shayle 32.9% · guest 67.1%24:00 · Shayle 23% · guest 77%24:00 · Shayle 23% · guest 77%27:00 · Shayle 27.9% · guest 72.1%27:00 · Shayle 27.9% · guest 72.1%30:00 · Shayle 0% · guest 100%30:00 · Shayle 0% · guest 100%33:00 · Shayle 21.6% · guest 78.4%33:00 · Shayle 21.6% · guest 78.4%
Sharpest disagreement ▶ 27:59 State Opposition to Waste Transport

Dr. Shafer bluntly dismisses easy transport assumptions, stating flatly that if a state does not want nuclear material moving through its borders, it will find a way to block it.

 Hardest push from Shayle ▶ 6:55 Pushing on Timeline Discrepancies

Shayle directly challenges the guest to reconcile her claim that most fission products decay within hundreds of years against the legal standard of managing waste for tens of thousands or millions of years.

 Biggest teaching moment ▶ 9:44 Fast Reactors and Actinide Transmutation

Dr. Shafer comprehensively explains the physics of fast-reactor recycling loops, demonstrating why burning long-lived actinides converts inter-civilizational waste problems into manageable multi-century storage.

 Shayle holds their own ▶ 8:27 Clarifying the Fuel Recycling Dilemma

Shayle demonstrates strong subject literacy by intervening to point out that recycling unreacted uranium only replaces fresh mining rather than eliminating the high-level waste fraction.
the scores for every segment, with the reasoning behind each
ChapterTopicShayle as informed peerGuest teachingGuest disagreementShayle pushing backWhy
The Chemical Reality of Spent Nuclear Fuel and Transmutation 5612 Shayle demonstrates a solid conceptual grasp of open fuel cycles and half-life dynamics, but Dr. Shafer educates him on how actinide transmutation and fast-reactor recycling actually reduce long-term geological burdens.
Yucca Mountain, Legal Deadlocks, and the Nuclear Waste Fund 4511 Shayle inquires about accumulated stockpiles and Yucca Mountain's failure, allowing Dr. Shafer to lay out the regulatory and legal trajectory of the Nuclear Waste Policy Act and utility lawsuits.
Sponsor Messages: Bloom Energy, Engie, and EnergyHub 3412 Following sponsor messaging, Shayle pushes on the physical vulnerability of spent fuel storage facilities, prompting Dr. Shafer to explain passive dry cask storage versus active cooling in spent fuel pools.
Advanced Reactor Designs, Waste Forms, and Micro-Reactor Logistics 5622 Shayle probes the logistical feasibility of transporting entire microreactors across state lines, while Dr. Shafer categorizes reactor fuels by waste form durability and notes state-level legal powers.
Long-Term Repository Prospects, Deep Boreholes, and Social Licensing 4611 Dr. Shafer walks through repository capacity math under nuclear tripling scenarios and outlines how co-located recycling facilities or deep boreholes could resolve state-level social license hurdles.

Statements from this episode (14)

Assertion Supported
Shafer: Spent commercial nuclear fuel is 95% uranium and 5% byproducts
“The uranium composition, as far as the actual irradiated meat, ends up being about 95% of the material, and then the other five percent are these fission products that grow in over the course of the irradiation, as well as the, what I call the transmutation pr…”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 3:56
Assertion Supported
Shafer: Yucca Mountain had a statutory 10,000-year management obligation
“The legal limit on Yucca Mountain was a 10,000 year management, you know, obligation.”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 6:43
Assertion Supported
Shafer: US holds 90,000 tons of nuclear waste, adding 2,000 annually
“It's about 90,000 metric tons. We generate about 2000 metric tons a year.”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 13:31
Assertion Supported
Shafer: Yucca Mountain remains the legal US nuclear waste repository
“Yucca Mountain is still actually the law of the land in the U.S. This is what is in the Nuclear Waste Policy Act”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 15:40
Opinion
Shafer: Used nuclear fuel still holds massive untapped energy value
“I don't think about it as nuclear waste, I think about it as use nuclear fuel, because there's actually a lot of energy value with respect to that”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 15:48
Assertion Supported
Shafer: US Nuclear Waste Fund holds roughly $50 billion in unspent fees
“And there's anywhere from about, we'll say about fifty billion dollars within that fee that's been paid forward.”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 16:56
Assertion Supported
Shafer: Spent nuclear fuel requires roughly a decade in pools before dry storage
“So you let that happen, and that happens maybe for a decade or so. And then you're in the position where you can take the material out, And put it in these dry storage casts, right?”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 20:50
Assertion Supported
Shafer: Dry concrete nuclear waste casks require no active management
“Well, I mean, the concrete cask, once it cools to that point, that's very passive. That is something that you don't need to actively manage”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 22:09
Insight
Shafer: TRISO fuel resists leaching, whereas molten salts require waste conditioning
“Triso, again, is a wonderful waste form for all the reasons that people love it as a fuel form, right? The radioactive material is not getting out when it's reacting in the reactor, and it's not getting out when it's Sitting on the side of the building. Howeve…”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 24:06
Assertion Supported
Shafer: TerraPower and Oklo sodium fast reactors will require waste conditioning
“Any of the sodium fast reactor designs, so your TerraPower, your Oklo, things of this nature, this would be A conversation where you need to have, at a minimum, a waste conditioning component to this, and if you're a company like Oklo, that's very much thinkin…”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 26:02
Opinion
Shafer: States will successfully block nuclear waste transit if they oppose it
“If a state does not want you to move nuclear material through the state, it will find a way for you to not move nuclear material through the state”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 28:00
Prediction Not checkable as stated
Shafer: Nevada will likely not agree to host a nuclear repository again
“I would be surprised if Nevada ends up stepping forward into this space again as far as, you know, there's conversations with respect to that being of consideration, etc.”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 29:34
Assertion Supported
Shafer: Yucca Mountain would already be legally full if opened today
“Right now, if Yucca Mountain was opened we had a 70, a legal limit of Yucca Mountain of 70,000 metric tons of material, right? So, at 90,000 metric tons, Yucca Mountain would nominally be full, right?”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 31:37
Assertion Supported
Shafer: Tripling nuclear power generates 6,000–8,000 metric tons of waste annually
“Especially if you're seriously thinking about tripling or quadrupling nuclear, you end up in a scenario where you're not actually talking about 2000 metric tons of material. Per year, you're talking about six to 8000 metric tons of material per year.”
Dr. Jen Shafer (Jen Schaefer) Mar 26, 2026 ▶ 32:09
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