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Federal Register / Vol. 86, No. 43 / Monday, March 8, 2021 / Notices
application of the electrical current.
NNSA estimates that dissolution will be complete in less than 24 hours per charge. After each dissolution cycle is complete, solution samples will be obtained to ensure complete dissolution of the FCA fuel. If necessary, a subsequent heating step will be performed to complete the dissolution process. NNSA estimates that 18 batches would be required to complete processing of the FCA fuel. After completion of each batch, the material will be transferred to an accountability tank in H-Canyon and then to a canyon vessel for storage and eventual transfer to the H-Tank Farm. Immobilization and storage of the material will occur at DWPF pending disposal in a geologic repository. NNSA estimates that vitrification of the FCA fuel along with HLW at DWPF will result in three waste canisters.
The electrolytic dissolution process is very similar to the chemical dissolution process as described in Appendix B, section B.1.3, of the SPD Supplemental EIS. Dissolved FCA fuel solutions will be very similar to those resulting from chemical dissolution, and compatible with transfer to the H-Area Tank Farm pending immobilization in DWPF. FCA
dissolution operations would be scheduled in conjunction with other HCanyon operations and coordinated with tank farm and DWPF operations.
In the SPD Supplemental EIS, NNSA
evaluated disposition of 6 MT of plutonium using both the H-Canyon/
HB-Line to DWPF Alternative and the WIPP Alternative. The impact assessment of both alternatives includes up to 350 kg of FCA fuel. In the Supplement Analysis for Disposition of FCA Plutonium, NNSA compared the impacts of processing 350 kg of FCA
fuel using both alternatives.
Differences in doses and potential latent cancer fatalities to workers and the public between the WIPP
Alternative and the H-Canyon/HB-Line Alternative are minor. In the case of electrolytic dissolution, worker dose would be lower than the H-Canyon/HBLine chemical dissolution and WIPP
alternatives. Both would require handling and de-cladding of the fuel prior to processing. In the SPD
Supplemental EIS Tables 43 and 44, NNSA estimated radiation doses and impacts, in terms of latent cancer fatalities LCFs, from operations for the H-Canyon/HB-Line Alternative including the material evaluated in the SA to workers and the public. Worker doses were estimated to be less than the SRS administrative limit of 500
millirem mrem per year, resulting in no LCFs on an annual basis. Over the
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life of the H-Canyon/HB-Line to DWPF
Alternative 13 years, NNSA estimated that operations could result in an estimated 2 LCFs to involved workers and none to members of the public or the maximally exposed individual. The proposed action was included in the estimates for the H-Canyon/HB-Line Alternative. No LCFs in addition to those NNSA previously estimated would result from implementation of the proposed action.
Vitrification of the FCA fuel in DWPF
would result in an estimated three HLW
glass canisters. Less CHTRU waste would be generated using the H-Canyon/HB-Line Alternative because WIPP alternative processing results in TRU waste for disposal at WIPP. Other differences in waste generation are minor.
To ensure safe and secure operations, NNSA, in conjunction with DOE/EM, which owns the facilities, would review and revise, as needed, safety basis documents for all involved facilities at SRS.
Basis for Decision To disposition the FCA fuel the H-Canyon/HB-Line Alternative can be implemented at a substantially lower cost than the WIPP Alternative. The SRS
H-Canyon has used electrolytic dissolution in the past. The process is well known and can be implemented with little technology maturation. The impacts from activities related to the disposition of FCA fuel have been evaluated in the SPD Supplemental EIS.
There are no substantial differences in environmental impacts between using the electrolytic dissolver and the standard H-Canyon dissolver for this amount of material up to 350 kg. All processes downstream of the dissolver are the same as those analyzed in the H-Canyon/HB-Line to DWPF
Alternative. The FCA fuel would be prepared for disposition and safely stored at SRS in existing facilities pending the availability of a geologic repository.
Amended Decision NNSA has decided to change the disposition pathway for up to 350 kg FCA fuel from the WIPP Disposal Alternative to the H-Canyon/HB-Line to DWPF Alternative, as described and evaluated in the SPD Supplemental EIS.
NNSA will use electrolytic dissolution instead of chemical dissolution because the FCA fuel is clad in stainless steel.
FCA fuel comprises less than half of the 0.9 MT of gap material plutonium evaluated in DOE/EA2024, and less than 6 percent of the 6 MT NNSA
decided to disposition using the WIPP

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Disposal Alternative. NNSA remains committed to dispositioning 6 MT of surplus plutonium using the WIPP
Disposal Alternative, as NNSA
previously decided 81 FR 19588, April 5, 2016.
Signing Authority This document of the Department of Energy was signed on March 1, 2021, by Charles P. Verdon, Acting Under Secretary for Nuclear Security and Administrator, NNSA, pursuant to delegated authority from the Secretary of Energy. That document with the original signature and date is maintained by DOE. For administrative purposes only, and in compliance with requirements of the Office of the Federal Register, the undersigned DOE Federal Register Liaison Officer has been authorized to sign and submit the document in electronic format for publication, as an official document of the Department of Energy. This administrative process in no way alters the legal effect of this document upon publication in the Federal Register.
Signed in Washington, DC, on March 3, 2021.
Treena V. Garrett, Federal Register Liaison Officer, U.S.
Department of Energy.
FR Doc. 202104707 Filed 3521; 8:45 am BILLING CODE 645001P

DEPARTMENT OF ENERGY
Federal Energy Regulatory Commission Docket Nos. CP15554009; CP15555
007

Atlantic Coast Pipeline, LLC, Eastern Gas Transmission and Storage, Inc.;
Notice of Amendment of Certificates and Opening of Scoping Period Take notice that on January 4, 2021, Atlantic Coast Pipeline, LLC ACP, 120
Tredegar Street, Richmond, VA 23219, filed its Atlantic Coast Project Disposition and Restoration Plan, and on November 20, 2020, Eastern Gas Transmission and Storage, Inc. EGTS,1
6603 West Broad Street, Richmond, Virginia 23230, filed the Supply Header Project Restoration Plan.2 On July 5, 2020, Dominion Energy Transmission, 1 On November 1, 2020, Dominion Energy sold certain companies including Dominion Energy Transmission, Inc., the Supply Header Project developer, to Berkshire Hathaway Energy Company and Dominion Energy Transmission, Inc. changed its name to Eastern Gas Transmission and Storage, Inc.
2 Both plans were submitted in response to Commission staffs October 27, 2020 Data Request.

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