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US nuclear weapons: first low-yield warheads roll off the production line via The Guardian

New type of weapon, ordered by Trump’s nuclear posture review, could make conflict more likely, say experts

The US has begun making a new, low-yield nuclear warhead for its Tridentmissiles that arms control advocates warn could lower the threshold for a nuclear conflict.

The National Nuclear Security Administration (NNSA) announced in an email it had started manufacturing the weapon at its Pantex nuclear weapons plant in Texas, as ordered by Donald Trump’s nuclear posture review (NPR) last year.

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The new weapon, the W76-2, is a modification of the existing Trident warhead. Stephen Young, a senior Washington representative of the Union of Concerned Scientists, said its yield had most likely been cut by taking away one stage from the original two-stage, W76 thermonuclear device.

“As best we can tell, the only requirement is to replace the existing secondary, or second stage, with a dummy version, which is what they do every time they test fly a missile,” Young said, adding that the amount of tritium, a hydrogen isotope, may also be adjusted. The result would be to reduce its explosive power from 100 kilotons of TNT, to about five – approximately a third of the force of the bomb dropped on Hiroshima.

The Trump administration has argued the development of a low-yield weapon would make nuclear war less likely, by giving the US a more flexible deterrent. It would counter any enemy (particularly Russian) perception that the US would balk at using its own fearsome arsenal in response to a limited nuclear attack because its missiles were all in the hundreds of kilotons range and “too big to use”, because they would cause untold civilian casualties.

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There has been a spate of developments signalling that a new arms race is gathering pace. Vladimir Putin has unveiled a new generation of Russian weapons, and Russia’s suspected development of an cruise missile banned under the 1987 Intermediate-range Nuclear Forces (INF) treaty.

Trump has declared he will take the US out of the treaty, and the administration is expected to suspend compliance and serve six months’ notice of withdrawal on Saturday.

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“The belief that there might be tactical advantage using nuclear weapons – which I haven’t heard that being openly discussed in the United States or in Russia for a good many years – is happening now in those countries which I think is extremely distressing,” Perry said.

That’s a very dangerous belief.”

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