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For immediate release: March 26, 2026
NNSA releases final LANL Site-Wide Environmental Impact Statement (SWEIS) and Decision to pursue massive LANL expansion However even the largest of last year's expansion plans do not include NNSA's recently doubled plutonium warhead core ("pit") production requirements. As a result, NNSA has already admitted its brand-new SWEIS may be inadequate. Contact: Greg Mello: 505-577-8563 Albuquerque, NM -- Tomorrow, the National Nuclear Security Administration (NNSA), a semi-autonomous part of the Department of Energy (DOE), will release its final Site-Wide Environmental Impact Statement (SWEIS) for the continued operation of Los Alamos National Laboratory (LANL), along with its first Record of Decision (ROD) based on that SWEIS -- which is to pursue the largest LANL expansion examined, the "Expanded Operations Alternative" (EOA).
NNSA has already released those documents, which are also available on our web site (EIS-0552: Summary; Vol 1; Vol 2; Record of Decision).
The EOA involves constructing approximately 219* new facilities with a total floor area of 5.597 million sq. ft. The net new construction, after subtracting the sum of decommissioning, dismantling and disposal (DD&D) projects, is 2.751 million sq. ft. By comparison, the Pentagon has 6.5 M sq. ft. of interior space. The EOA also includes more than 100* facility upgrades, and utility and infrastructure projects totaling 1,190* acres (1.86 sq. miles). It ALSO includes 13,935* acres (21.8 sq. miles) of forest thinning, some of which is habitat for the Mexican Spotted Owl and Jemez Salamander.
(* indicates figures derived from the draft SWEIS. The final SWEIS figures will likely differ slightly. The figures in bold are from this week's final SWEIS, however.)
This final SWEIS is not an expansion plan per se, let alone a congressionally-authorized and -funded plan. It is rather a smorgasbord of expansion possibilities (construction, demolition, and laboratory operations) for which environmental analysis has been done, in three aggregate levels. Possible projects and their impacts were not analyzed individually.
In this SWEIS NNSA analyzed three alternatives, into which hundreds of proposed projects and associated programs were placed. NNSA called these, in increasing scale of action, the "No Action Alternative" (NAA), the "Modernized Operations Alternative" (MOA), and finally the EOA, which was chosen. The MOA included everything in the NAA, and added more. The EOA included everything in the MOA, and added yet more.
All other possible alternatives for the future of LANL were rejected as not meeting mission requirements, or as unreasonable.
The "No Action" alternative, despite its name, includes a lot of "action": 1.461 million sq. ft. in new construction, plus 192 acres of utility and infrastructure projects, plus the huge operational expansion associated with the 24/7 pit production mission.
In NNSA's words,
An outline of the estimated environmental consequences of the chosen EOA, in comparison with the NAA and MOA, can be seen in the SWEIS Summary (pp. S-15 to S-23).
The increased impacts noted are not however increases over the actual situation at LANL today. Some indications of the expected increases in impacts over today's be seen on p. S-24. Drinking water and electricity consumption are expected to roughly double if the EOA is fully implemented, for example, as is petroleum fuel usage.
However even the largest of last year's expansion plans, the EOA, does not include all of NNSA's recently doubled plutonium warhead core ("pit") production requirements.
As a result, NNSA has already admitted its brand-new SWEIS may be inadequate ("Wyka Tells County Council LANL Expects To Receive $5.2 Billion In Federal Appropriations With Significant Portion To Support Expanding Nuclear Weapons Activities," Los Alamos Reporter, Mar 5, 2026):
NNSA's February 11, 2026 "framework memorandum" stipulates a much higher production rate at LANL:
In short, this SWEIS has no alternative that includes the current pit mission assigned to LANL.
The increased pit mission will entail increased plutonium processing, manufacturing, and waste generation as well as additional staff, increased risk of exposures to radiation and other hazards, and commuting.
Other recent policy changes will also affect the veracity of this SWEIS, including the weakening of worker safety standards for radiation exposure ("Los Alamos National Laboratory to allow for additional annual worker dose, NNSA official says," Santa Fe New Mexican, Feb 28, 2026).
We touch upon some of these changes in this Feb. 2 Bulletin: "NNSA to leave "life extension," "stewardship" paradigm to build new weapons; LANL pit aspirations triple; LANL rad exposure standards loosened fivefold." See also "At Nuclear Deterrence Summit, Lab Directors Frame Regulatory Reform As Key To Modernization," LA Daily Post, Feb 5, 2026.
Study Group director Greg Mello:
This press release discusses only some of the underlying procedural issues. For a succinct review of others and an introduction to the sordid history of this SWEIS please see our comments on the Draft SWEIS, Apr 10, 2025.
***ENDS***
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