{"id":23526,"date":"2026-10-19T09:30:47","date_gmt":"2026-10-19T13:30:47","guid":{"rendered":"https:\/\/www.autonocion.com\/us\/?p=23526"},"modified":"2026-10-19T06:18:03","modified_gmt":"2026-10-19T10:18:03","slug":"12-foot-fuel-bundle-30-degrees-49000-pound-canister-crane-reactor-head","status":"publish","type":"post","link":"https:\/\/www.autonocion.com\/us\/12-foot-fuel-bundle-30-degrees-49000-pound-canister-crane-reactor-head\/","title":{"rendered":"A 12-foot bundle of 216 fuel rods leaning 30 degrees inside the first American reactor brought back from retirement will be laid flat in a 49,000-pound steel canister and hoisted out of the water by the crane that lifts the reactor head, a move no plant has made before"},"content":{"rendered":"

A nuclear fuel bundle has two jobs while it’s being moved: stand up straight, and stay underwater. For about seven weeks now, one of the 204 bundles at Palisades has only been managing the second one.<\/p>\n

That’s about to change. On October 13, the Nuclear Regulatory Commission signed off on a plan to lift the leaning bundle out of the first American reactor ever brought back from retirement, and the plan is frankly stranger than I expected. The bundle doesn’t go out the way fuel normally leaves a reactor. It goes into a 49,000-pound steel canister, gets hoisted out of the water by the big crane that normally handles the reactor head, and rides across the containment building through a hatch built for equipment, not fuel.<\/p>\n

We’ve been on this story since the day the first bundles went back in. If you missed the earlier rounds, here’s where things stood two weeks ago<\/a>. The short version: Holtec started loading fuel into the Covert, Michigan reactor on August 30, got eight of the 204 assemblies in, and one of them tilted over after the loading machine had set it down and let go. Everything fuel-related stopped right there.<\/p>\n

Now we know how it gets out, and when.<\/p>\n

So how do you pick up a fuel bundle that won’t stand up?<\/h2>\n

Not with the machine that put it there, apparently. Holtec told the NRC that visual inspections showed damage to the top of the assembly, the part the loading machine’s grapple is supposed to lock onto. The bundle, which the paperwork calls DD41, is leaning at roughly 30 degrees, with its bottom still seated in its slot and its top resting against the shroud that surrounds the core. You can’t grab the top, and you can’t just drag it, because the 216 rods inside are the whole point of keeping it in one piece.<\/p>\n

So Holtec’s engineers built something new. The plan the NRC approved uses the containment polar crane, the one that lifts the reactor vessel head during a normal outage, with a custom-made fuel movement device hanging off it on slings and chain falls. That device grips the bundle by its structural guide bars, which are the bits of the frame that hold the rods in place, and lifts it free. The whole time, there has to be at least 10 feet of water over the fuel.<\/p>\n

Then it gets laid down. Horizontally. Into a steel canister sitting on the floor of the flooded reactor cavity. Once the lid is on and the bundle is confirmed to be sitting right, the crane lifts the loaded canister, all 49,000 pounds of it, clear of the water, the crew drains it, and it travels across containment on the crane’s existing rails to the equipment hatch. From there a trolley carries it into the spent fuel pool building, and a second crane picks it up, stands it upright, and lowers it into the cask pit at the edge of the pool.<\/p>\n

If that sounds like a lot of handling for one bundle, it is. The NRC’s own safety evaluation calls it a first of a kind fuel movement.<\/p>\n

\n
\n
Loaded canister<\/div>\n
49,000 lb<\/div>\n
Approximate lift weight of the fuel transfer canister with the bundle inside, per the NRC safety evaluation. Heavy enough to fall under the agency’s heavy-load rules.<\/div>\n<\/div>\n
\n
Water over the fuel<\/div>\n
10 ft<\/div>\n
Minimum depth while the bundle is lifted and placed in the canister. The plant’s standard fuel-handling analysis assumes 23 feet.<\/div>\n<\/div>\n
\n
Tilt<\/div>\n
30\u00b0<\/div>\n
Angle of assembly DD41 off the core plate, bottom seated in location H-1, top leaning on the core shroud. Fuel rods intact per coolant chemistry sampling.<\/div>\n<\/div>\n
\n
DEADLINE<\/div>\n
Implementation<\/div>\n
10 days<\/div>\n
Amendment No. 283 was issued October 13 and has to be implemented within 10 days, which puts the move on or before October 23.<\/div>\n<\/div>\n<\/div>\n

The normal route is a tube, and this bundle can’t use it<\/h2>\n

This is the bit I had to look up, so let me save you the trouble. In a pressurized water reactor like Palisades, fuel doesn’t get carried through the plant. It gets passed through a wall. The refueling machine picks a bundle up out of the core, sets it in a carriage, the carriage tips the bundle over on its side, and it slides through a transfer tube from the containment building into the spent fuel pool next door, underwater the entire way. Then it’s tipped back upright and parked in a rack.<\/p>\n

Which means the plant’s whole accident analysis for fuel handling assumes the fuel is under at least 23 feet of water if anything goes wrong. Water does two things there: it shields the workers, and if a rod ever cracks, it holds onto a good chunk of what comes out.<\/p>\n

DD41 can’t go through the tube, because the machine that feeds the tube can’t grab it. So Holtec’s plan takes the bundle out of the water, which is why it needed an amendment to the plant’s license rather than a procedure change. The NRC’s reviewers had to run the accident math again with no water to credit for part of the trip, and they did, on the assumption that the canister gets dropped with the equipment hatch wide open and every rod in the bundle fails. Their answer was that doses at the site boundary and in the control room stay under the federal limits. The agency also ran its own shielding calculations on the canister and said the radiation levels during the dry stretch should look like those on a normal outage job.<\/p>\n

Does that mean there’s nothing to it? No. This is a used bundle, from the plant’s last runs before the 2022 shutdown, and the NRC’s evaluation treats it as irradiated fuel with about four years of decay behind it. The canister isn’t sealed either, so the plan includes a water chemistry sample right after the lid goes on, to confirm nothing cracked while the bundle was being straightened, and radiation protection staff watching the air monitors through the lift. The NRC’s letter notes those monitors may alarm as the canister breaks the surface, and that someone has to be standing there deciding whether that’s the water or the fuel.<\/p>\n

Straightening a bent bundle inside a box<\/h2>\n

One of you called this in the comments on our last piece. The bundle bent. The NRC’s review says the upper tie plate is bowed, and the fuel vendor’s evaluation predicts up to 3 inches of plastic deformation, meaning the bundle has taken a set and won’t spring back on its own.<\/p>\n

That raised an obvious question at the NRC, and I’d have asked it too. The canister drawings didn’t seem to leave room for a bundle that’s bowed, so what happens when you put the lid on a 12-foot assembly that isn’t straight?<\/p>\n

Holtec’s answer, backed by the vendor, is that the lid pushes it straight, and that the frame absorbs the force rather than the rods. The grid straps and guide bars take the strain, which is what they’re designed for, and the rods stay inside the envelope of the lid. The NRC didn’t just take that on faith. It got Holtec to add a stop-work rule: once the bundle is sitting on its pedestals inside the canister, cameras check the gaps, and if any gap between the bundle and the pedestals is bigger than 2 inches, work stops and the site re-evaluates. There’s a marked alignment tool for reading that 2 inches on camera. The largest gaps, if there are any, are expected at the top end, where the damage is.<\/p>\n

Two inches is the whole margin. I find that pretty reassuring, frankly, because it’s a number someone can see on a screen rather than a judgment call made at the lip of a reactor cavity.<\/p>\n

Another reader argued the special tooling was only needed because a fuel assembly is heavy. I get the logic, but that isn’t what the filings say. The loading machine lifts these bundles for a living. The problem is the damaged top, which the grapple can’t connect to, and the lean, which puts the bundle somewhere the grapple can’t reach. The weight is why the NRC classified the loaded canister as a heavy load and demanded a drop analysis, which Holtec ran three ways, flat, top end first and bottom end first, and the canister held together in all three.<\/p>\n

Holtec asked for an emergency, and the NRC said exigent<\/h2>\n

This bit of the paperwork is the one I’d have skipped if I were reading fast, and I’m glad I didn’t. Holtec filed on September 30 and asked for the amendment to be processed as an emergency, which would have meant no public notice and no comment period at all. The NRC said no to that. It processed the request as “exigent” instead, a notch down, which still skips the usual 30-day comment window but requires the agency to tell the public somehow. In this case, that meant notices in the Grand Rapids Press, the Kalamazoo Gazette and the Herald Palladium, and a three-day window to comment.<\/p>\n

Twenty people wrote in. The NRC says most of the comments were out of scope, which in regulator-speak means they were about whether Palisades should restart at all rather than about this specific lift. One commenter, though, pushed hard on the bowing, and the NRC’s answer to that is the 2-inch rule above. So the comment period did something.<\/p>\n

The NRC also reviewed the pool-side crane that stands the canister upright, and confirmed it’s still configured as single-failure-proof from the plant’s last dry cask loading campaign. Basically, that’s a crane built so one broken part can’t drop the load. The path the canister takes runs over a pit where spent fuel is stored, so Holtec had to show the agency that an existing analysis of a cask drop onto 73 stored assemblies bounds anything this smaller canister could do. It does, the NRC agreed, because the canister isn’t big enough to hit 73 of anything.<\/p>\n

Holtec said in a statement that the approach “was supported by engineering evaluations addressing structural integrity, fuel handling, thermal conditions, and radiation protection.” The NRC told The National its specialists and resident inspectors will keep watching the removal.<\/p>\n

What this does to the restart<\/h2>\n

Nothing official. Holtec still hasn’t put a date on it, and Patrick O’Brien, the company’s director of government affairs and communications, gave The National the line the company has used for months: Palisades “will return to service when all required work is complete and all federal requirements and industry standards are met.” A source close to Holtec told The National the company hopes to be back online by March 2027. I’d treat that as a hope. March is also the month the plant owes power to its two co-op customers, which makes it a deadline as much as a forecast.<\/p>\n

The same week the amendment landed, the NRC sent Holtec a separate letter saying its inspection found what it called a chilled work environment in two departments at the plant, supply chain and quality assurance, where employees may be hesitant to raise safety concerns. The agency said it found no violations and no significant plant safety issues, and Holtec said it’s taking action on it. I mention it because it’s on the record and it landed the same week, and it isn’t about this lift.<\/p>\n

The lift itself is the thing to watch. Once DD41 is in the pool, fuel loading can restart, 196 bundles still have to go in, the vessel head has to go back on, and the plant can finally move down the ladder toward cold shutdown and, eventually, power. That’s weeks of work before anyone pulls a control rod.<\/p>\n

Amendment No. 283 to Palisades’ operating license was issued on October 13, 2026, and has to be implemented within 10 days of that date.<\/p>\n","protected":false},"excerpt":{"rendered":"

A nuclear fuel bundle has two jobs while it’s being moved: stand up straight, and stay underwater. For about seven … <\/p>\n

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