Mark Nelson Profile picture
Mar 9 5 tweets 2 min read
SOUTH KOREA ELECTIONS: EARLY EXIT POLLS SHOW TINY LEAD FOR PRO-NUCLEAR PARTY

Six yrs ago, SK had one of the most admired, and ambitious, nuclear energy programs in the world.

Rapid progress on domestic plants plus winning & starting to deliver in UAE.

Since then: devastation.
With the election of a resolutely antinuclear president, Korean reactor performance plunged, falling as low as 59% by 2018.

New president canceled the future fleet and attempted to stop the plants ALREADY under construction. Only defeat in his Citizens' Jury saved the projects.
Despite continuing success at Barakah in Abu Dhabi, no other countries bought Korean reactors, as SK President harshly attacked his own nuclear. After all, if Hyundai cars were banned for being "too dangerous" in Korea, how popular would they be overseas?

Insiders I've talked to say that major industrial groups involved in building Korea's reactors for home and export see today's election results as life or death for Korean nuclear energy. They'll start decommissioning their forges and factories if another 6 yrs of damage awaits.
As of 30 minutes ago, the pro-nuclear energy Conservatives held a very thin 0.6% edge over their anti-nuclear opponents. Exit polls have been very reliable in the past.

Korea has very poor wind and solar resources, so the future of clean energy in SK hangs in the balance.

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More from @energybants

Mar 9
From the guy who falsely claimed that Zaporizhzhia pressurized water reactors could "blow up" like "10x Chernobyl," we have our next global panic started.

Respect to Ukraine for its brave, righteous defense.

But these statements are an attack on the global public.
Incorrect statements in above tweet: with cooling systems stopped, leaks are NOT imminent.

Further, leaks CANNOT put "entire Europe in danger" except through panic.

The fear is the weapon here. Deny it its power.

Read 4 tweets
Mar 9
CHERNOBYL UPDATE: BEWARE MISLEADING CLAIMS ABOUT OLD SPENT FUEL COOLING NEEDS

The spent fuel rods are at minimum 22 years old.

They have very little heat to dissipate. In most plants, spent fuel that is more than 5 years old sits in dry storage cooled easily by air.
THE BASICS: when fuel rods are done making energy in a reactor, plant staff remove them and put them in pools of water.

This is because the particles produced by the splitting of uranium ("fission products") are unstable and continue to undergo decay, and, thus, generate heat.
How much heat a fuel rod puts out depends on how much energy it produced in the reactor (called "burnup") and how long it has been since it left the reactor.

22 years is LONG ago. And RBMK (Chernobyl reactor type) has lower burnup than other reactor types, thus lower decay heat.
Read 15 tweets
Mar 7
MEDIA AIMING TO PANIC

A breathtakingly irresponsible headline from a multi-million follower media account.

There's a small device in a science lab that cannot sustain a chain reaction. It has almost no isotopes of concern inside.

This headline should never have been published.
Here is a plenty of detail from an expert with intimate knowledge of the device in question.

The facts were available before this headline was tweeted. This headline is an abuse of public trust.

People have contacted me, panicking, already.

By "almost no isotopes of concern" I mean vanishingly small quantities of isotopes of real threat to human internal health.

Of course what the media is showing is that actual radiation threat is irrelevant when the goal is to hurt the public through fear.

Simply unacceptable.
Read 4 tweets
Mar 6
I strongly recommend people do not get their nuclear safety information from Dr. Eric here.

Perhaps he's a good doctor or whatever (has a lot of followers so that's good?) but he is unselective about which nuclear risks are or aren't capable of causing large-scale disasters.
I agree that this war is bad and should stop.

If it doesn't stop, it will keep including nuclear safety issues, so we're going to see folks like Dr. Eric say each thing could cause a giant radiation disaster.

This is not helpful in understanding what the real risks are.
Please follow @CherylRofer who knows many of the world's experts with hands on experience with THESE SPECIFIC FACILITIES.

@jrmygrdn is great on these too; he asks technical experts the key questions he needs to understand, then interprets their answers in context for the public.
Read 6 tweets
Mar 4
Just so everybody knows: the statement that "if it blows up, it will be 10 times larger than Chornobyl", is absolute nonsense.

This is a bad situation because it is an attack on a nuclear plant with people in it, not because it can "blow up" and be "larger than Chornobyl".
First: if seismic sensors at the plant were triggered (for example if shells or bombs are used) the reactors which are of very different design would shut down automatically.

Second: the main risk at the plant is that cooling does not get to the reactor cores over time.
The containment domes around the reactors are extremely strong.

They will not be affected by light arms or moderate fire from heavier arms.

The worry is in interruption of plant cooling procedures after the reactors shut down.
Read 6 tweets
Feb 24
NUCLEAR, UKRAINE, EUROPEAN ENERGY

There are wild claims about Chernobyl going around. I will post the most accurate and authoritative information here and keep this thread updated.

FIRST: Chernobyl, even if attacked, is not a credible threat to health from radiation.
Several sources claimed that Chernobyl was under attack.

Chernobyl's outer containment dome could be breached if targeted.

Remaining hazardous material is deep under this. It's been cooling and decaying since 1986.

Dispersal would take intentional, targeted effort.
Keep an eye on Cheryl Rofer @CherylRofer 's statements:



She is correct in pointing out that it would be difficult to access this material.

It is well-characterized, meaning, we know what it is and how it could spread if disturbed.
Read 70 tweets

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