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  How does subsequent license renewal relate to the restart of nuclear power plants?
  Gary Adkins
  Subsequent license renewal (SLR) authorizes nuclear power plants to operate for an additional 20 years beyond the 60 years of the initial license (years 1–40) and the first license renewal (years 41–60). NUREG-2191, Generic Aging Lessons Learned for Subsequent License Renewal (GALL-SLR), and NUREG-2192, Standard Review Plan for Review of Subsequent License Renewal Applications (SRP-SLR), were issued in July 2017 and provide guidance for generic evaluation of plant aging management programs and reviews of SLR applications, respectively, by Nuclear Regulatory Commission staff.
  The first SLR application was submitted to the NRC for review in January 2018. A total of 10 additional SLR applications addressing 20 operating units have been submitted to the NRC. Nine operating units have been approved by the NRC, and 13 units are under review. These 22 units do not have any issues, including operating experience issues, precluding them from achieving a renewed license.
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Fast neutron inelastic scattering cross sections for levels between 700- and 1400-keV excitation energy in ²³²Th have been measured using the (n,n′) time-of-flight (TOF) technique. Measurements of 125-deg differential cross sections were made using neutrons with a typical energy spread of 8 to 10 keV, generated by the ⁷Li(p,n)⁷Be reaction. The incident neutron energies covered three regions: (a) 950 to 1550 keV in 50-keV intervals with the TOF spectrometer optimized to detect 200- to 600-keV scattered neutrons, (b) 1200 to 2000 keV in 100-keV intervals with the spectrometer optimized to detect 400- to 800-keV scattered neutrons, and (c) 1700 to 2100 keV in 100-keV steps with the spectrometer optimized for 800- to 1300-keV scattered neutrons. Throughout the experiment, an overall energy resolution of < 15 keV was maintained. Level cross sections were deduced from the 125-deg differential scattering cross sections and are compared with (n,n′λ) measurements and the ENDF/B-V evaluation. Angular distributions for states in the 700- to 900- keV region have been measured at 1.2, 1.5, and 2.0 MeV.