As a next step, Washington must get a change in rules from the Nuclear Suppliers Group, the main providers of so-called civilian nuclear technology around the world.
In thoroughbred racing, change comes slowly, impeded by the bureaucracy of state racing commissions, variability in rules from state to state, and significant differences of opinion over medication reform.
(This is a formula of the Chinese dynastic revolution called chanrang, which means the peaceful shift in rule from a decadent dynasty to a more-virtuous one).
Add to that a change in rule from native Taíno to Spanish to the American commonwealth it is today, and Puerto Rico's eclectic menu reflects its historic roots with Caribbean flare.
Regulators, already months behind in implementing rules from the Dodd-Frank financial reform law passed in 2010, are bracing for additional legal challenges as more regulations are completed.
Following changes in Isa rules, from April 6 savers will be able to invest up to £3,600 in a cash Isa in each tax year, and a further £3,600 into stocks and shares.
A change in pension rules from April 2015 means a retiree can now draw their entire pension in one go, if they wish.
Software companies, often precluded by a quirk in the rules from accessing capital via the Enterprise Investment Scheme and Venture Capital Trusts, should benefit from changes in the two schemes.
But many of the leases do constitute "technical defaults" on the mortgages, lenders say, and will likely result in new rules from local banks and additional hurdles to getting a home loan or refinancing a mortgage.
On Wednesday the LGA, which represents 370 councils across the country, called for headteachers to be allowed to give reasonable consideration to term-time leave requests, and for a change in the rules from the Department for Education.
In rule books from the 1880s, the play is called a "safety touch-down".
