>generally a non event

depends on what your priors are. Is a dropped rod a fukashima or chernoble international emergency? No.

However, depending on the design characteristics of the core, dropping rods lowers the heat distribution proximal to the dropped rod(s), but may result in higher peaks distal to the rods as physics characteristics attempt to maintain the average, which may exceed design limits.

Furthermore, rods aren't supposed to drop. How that came to pass is a matter that requires honest investigation - manufacturing/quality control, maintenance practices, personnel error? Much to learn to ensure safety.

Saying "we just had to rely on a critical reactor safety feature and scrammed, this is a nonevent" doesnt quite hit the mark.

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CoryOndrejka 2 hours ago | parent | next [-]

Of course, but that's not what happened here. For a pressurized water reactor, there are maintenance and procedural questions about why the rod was dropped. People will likely get fired over this. But from a standpoint of reactor and radiological safety, this is largely the design operating correctly and prioritizing radiological containment.

	▲	CoryOndrejka an hour ago \| parent [-]
		and for the curious who didn't what Chernobyl on HBO, other types of reactors have brief criticality increases on rod insertion, which is somewhere between bad, BAD, and OMFGWTFBBQVERYBAD. In the Chernobyl's case, they entered a criticality region known as "prompt criticality" which is where power doubling can happen at prompt neutron rates (e.g. milliseconds or faster). Very very bad. In the case of pressurized water reactors, this isn't what happens. Every moment of control rod descent is reducing criticality.

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iLoveOncall 2 hours ago | parent | prev [-]

[flagged]

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gambiting 2 hours ago | parent | next [-]

Except no bot would write "chernoble", unless it's manually edited after the fact

	▲	jdiff 30 minutes ago \| parent [-]
		Or "fukashima", which I think also rules out an AI editing pass at the end. That said, the smell of Claude specifically is pervasive in that comment. Perhaps someone who's ingested a bit too much Anthropic output?

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js2 2 hours ago | parent | prev [-]

"I was in the US nuclear navy, now I work in IT."