The limited global supply of lithium-7 could pose a challenge to operators of pressurized water reactors in coming years, according to a recent report by the Government Accountability Office. The report – obtained by the New York Times but not yet posted to the GAO's website because of the government shutdown – said a potential shortage poses a risk to the 65 American power reactors that use PWR technology. Most of the current supply comes from Russia and China but may run low in future years because of increased domestic demand in those countries, as well as secrecy surrounding their supplies. America's surplus from Cold War tritium production is mostly gone, the Times reported. The GAO estimated it would take about five years and between $10 million and $12 million to reestablish domestic production.Enriched lithium hydroxide monohydrate made with lithium-7 is used as an alkalizing agent in PWRs. Added to the coolant, it helps prevent corrosion than can be caused by the boric acid used as a neutron moderator.
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