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Для бомбы, речь о 239-плутонии

A plutonium pit is a critical component of every nuclear weapon, but the 
United States’ current capability to produce plutonium pits is limited. 
The National Nuclear Security Administration (NNSA), under Federal law 
and to meet national security requirements, must implement a strategy 
to provide the enduring capability and capacity to produce no fewer 
than 80 war reserve (WR) plutonium pits per year (ppy).
In 2018, the Nuclear Weapons Council endorsed NNSA’s approach for 
supplying plutonium pits to meet stockpile requirements: a two-site 
strategy with Savannah River Site (SRS) producing no fewer than 50 WR 
ppy and Los Alamos National Laboratory (LANL) producing no fewer 
than 30 WR ppy. This approach will provide an effective, responsive 
and resilient nuclear weapons infrastructure with the flexibility to adapt 
to shifting requirements and counter future threats.
Two-Site Strategy
Studies of NNSA’s approach show that having two geographically 
separated plutonium pit production facilities supports resiliency and 
redundancy from external threats and hazards. This provides NNSA 
with the flexibility and resilience to mitigate shutdowns, incidents or 
other impacts to operations at a given site.
Savannah River Plutonium Processing Facility (SRPPF)
SRS will achieve its part of this objective by constructing the Savannah 
River Plutonium Processing Facility (SRPPF) 

A plutonium pit это такой шарик в пару кило 239-плутония с особой кристаллической решеткой — из стабилизированного в особой аллотропной модификации (магия) плутония при помощи например волшебного металла галлия.