Tag: radionuclides

DOE Seeks Public Comment re Interpretation of High-Level Radioactive Waste

Posted on by MidwestCompact

On October 10, 2018, the U.S. Department of Energy (DOE or Department) issued a Federal Register notice seeking public comment on the Department’s interpretation of the definition of the statutory term “high-level radioactive waste” (HLW) as set forth in the Atomic Energy Act of 1954 and the Nuclear Waste Policy Act of 1982.

DOE interprets the term “high-level radioactive waste,” as stated in the Atomic Energy Act of 1954 as amended (AEA) and the Nuclear Waste Policy Act of 1982 as amended (NWPA), in a manner that defines DOE reprocessing wastes to be classified as either HLW or non-HLW based on the radiological characteristics of the waste and their ability to meet appropriate disposal facility requirements.  The basis for DOE’s interpretation comes from the AEA and NWPA definition of HLW:

  1. the highly radioactive material resulting from the reprocessing of spent nuclear fuel, including liquid waste produced directly in reprocessing and any solid material derived from such liquid waste that contains fission products in sufficient concentrations; and,
  1. other highly radioactive material that the Commission, consistent with existing law, determines by rule requires permanent isolation.

In paragraph A, according to the Federal Register notice, Congress limited HLW to those materials that are both “highly radioactive” and “resulting from the reprocessing of spent nuclear fuel.”  Reprocessing generates liquid wastes, with the first cycle of reprocessing operations containing the majority of the fission products and transuranic elements removed from the spent nuclear fuel (SNF).  Thus, in paragraph A, Congress distinguished HLW with regard to its form as both “liquid waste produced directly in reprocessing” and “any solid material derived from such liquid waste that contains fission products in sufficient concentrations,” states the Federal Register notice.

In paragraph B, Congress defined HLW also to include “other highly radioactive material” that the U.S. Nuclear Regulatory Commission (NRC) determines by rule “requires permanent isolation,” continues the Federal Register notice.  HLW under paragraph B includes highly radioactive material regardless of whether the waste is from reprocessing or some other activity.  Further, under paragraph B, classification of material as HLW is based on its radiological characteristics and whether the material requires permanent isolation, states the Federal Register notice.

According to the Federal Register notice, the common element of these statutory paragraphs defining HLW is the requirement and recognition that the waste be “highly radioactive.”  Additionally, both paragraphs reflect a primary purpose of the NWPA, which is to define those materials for which disposal in a deep geologic repository is the only method that would provide reasonable assurance that the public and the environment will be adequately protected from the radiological hazards the materials pose.

The terms “highly radioactive” and “sufficient concentrations” are not defined in the AEA or the NWPA.  By providing in paragraph A that liquid reprocessing waste is HLW only if it is “highly radioactive” and that solid waste derived from liquid reprocessing waste is HLW only if it is “highly radioactive” and contains fission products in “sufficient concentrations” without further defining these standards, the Federal Register notice asserts that Congress left it to DOE to determine when these standards are met.  Given Congress’ intent that not all reprocessing waste is HLW, the Federal Register notice states that it is appropriate for DOE to use its expertise to interpret the definition of HLW, consistent with proper statutory construction, to distinguish waste that is non-HLW from waste that is HLW.

The DOE interpretation is informed by the radiological characteristics of reprocessing waste and whether the waste can be disposed of safely in a facility other than a deep geologic repository.  The Federal Register notice explains that this interpretation is based upon the principles of the NRC’s regulatory structure for the disposal of low-level radioactive wastes.

In its regulations, NRC has identified four classes of low-level radioactive waste (LLW) — Class A, B or C — for which near-surface disposal is safe for public health and the environment, as well as Greater-than-Class C (GTCC) low-level radioactive waste for which near-surface disposal may be safe for public health and the environment.  This waste classification regime is based on the concentration levels of a combination of specified short-lived and long-lived radionuclides in a waste stream, with Class C LLW having the highest concentration levels.  Waste that exceeds the Class C levels is evaluated on a case-specific basis to determine whether it requires disposal in a deep geologic repository or whether an alternative disposal facility can be demonstrated to provide safe disposal.  According to the Federal Register notice, the need for disposal in a deep geologic repository results from a combination of two radiological characteristics of the waste:  (1) high activity radionuclides, including fission products, which generate high levels of radiation; and, (2) long-lived radionuclides which, if not properly disposed of, would present a risk to human health and the environment for hundreds of thousands of years.

Because the NRC has long-standing regulations that set concentration limits for radionuclides in waste that is acceptable for near-surface disposal, the Federal Register notice contends that it is reasonable to interpret “highly radioactive” to mean, at a minimum, radionuclide concentrations greater than the Class C limits.  Reprocessing waste that does not exceed the Class C limits is non-HLW.

DOE interprets “sufficient concentrations” in the statutory context in which the definition was enacted, which is focused on protecting the public and the environment from the hazards posed by nuclear waste.  In addition to the characteristics of the waste itself, the risk that reprocessing waste poses to human health and the environment depends on the physical characteristics of the disposal facility and that facility’s ability to safely isolate the waste from the human environment.  Relevant characteristics of a disposal facility may include the depth of disposal; use of engineered barriers; and, geologic, hydrologic and geochemical features of the site.  Taking these considerations into account, the Federal Register notice states that it is reasonable to interpret “sufficient concentrations” to mean concentrations of fission products in combination with long-lived radionuclides that would require disposal in a deep geologic repository.

Accordingly, under DOE’s interpretation, solid waste that exceeds the NRC’s Class C limits would be subject to detailed characterization and technical analysis of the radiological characteristics of the waste.  This, combined with the physical characteristics of a specific disposal facility and the method of disposal, would determine whether the facility could meet its performance objectives and if the waste can be disposed of safely.  The waste characterization and analysis process would govern this approach, as well as the performance objectives for the disposal facility established by the applicable regulator, to ensure that it is protective of human health and the environment.

The DOE interpretation does not require the removal of key radionuclides to the maximum extent that is technically and economically practical before DOE can define waste as non-HLW.  According to the Federal Register notice, nothing in the statutory text of the AEA or the NWPA requires that radionuclides be removed to the maximum extent technically and economically practical prior to determining whether waste is HLW.  DOE has determined that the removal of radionuclides from waste that already meets existing legal and technical requirements for safe transportation and disposal is unnecessary and inefficient, as well as does not benefit human health or the environment.  To the contrary, the Federal Register notice states that it potentially presents a greater risk to human health and the environment because it prolongs the temporary storage of waste.

Therefore, under DOE’s interpretation, waste resulting from the reprocessing of SNF is non-HLW if the waste:

  1. does not exceed concentration limits for Class C low-level radioactive waste as set out in section 61.55 of title 10, Code of Federal Regulations; or,
  1. does not require disposal in a deep geologic repository and meets the performance objectives of a disposal facility as demonstrated through a performance assessment conducted in accordance with applicable regulatory requirements.

Reprocessing waste meeting either I or II of the above is non-HLW.  Therefore, according to the Federal Register notice, such waste may be classified and disposed in accordance with its radiological characteristics in an appropriate facility provided all applicable requirements of the disposal facility are met. 

For additional information, see 83 Federal Register 50,909 (October 10, 2018).  Interested stakeholders may also contact Theresa Kliczewski at HLWnotice@em.doe.gov or at (202) 586-3301.

NRC to Conduct Very Low-Level Radioactive Waste Scoping Study

Posted on by MidwestCompact

On February 14, 2018, the U.S. Nuclear Regulatory Commission (NRC) issued a Federal Register notice announcing the agency’s plans to conduct a very low-level radioactive waste (VLLW) scoping study to identify possible options to improve and strengthen the NRC’s regulatory framework for the disposal of the anticipated large volumes of VLLW associated with the decommissioning of nuclear power plants and material sites, as well as waste that might be generated by alternative waste streams that may be created by operating reprocessing facilities or a radiological event.  (See 83 Federal Register 6,619 dated February 14, 2018.)

As part of the process, the NRC is seeking stakeholder input and perspectives.  Respondents are asked to consider specific questions posed by the NRC staff and other federal agencies in the Federal Register notice.  Comments are due by May 15, 2018.  Comments considered after this date will be considered if it is practical to do so, but the NRC is only able to ensure consideration of comments received on or before the deadline.

Specific Request for Comment

The NRC is interested in receiving comments from a broad range of stakeholders including professional organizations, licensees, Agreement States and members of the public.  Likewise, interested stakeholders with insight into relevant international initiatives are invited to provide their perspectives regarding international best practices related to VLLW disposal or other experiences that the NRC staff should consider.  All comments will be considered and the results of the scoping study will be documented in a publicly available report, which will inform the Commission of the staff’s recommendation for addressing VLLW disposal.

All comments that are to receive consideration in the VLLW Scoping Study must be submitted electronically or in writing.  Respondents are asked to consider the background material (see below) when preparing their comments.  In responding, commenters are encouraged to provide specific suggestions and the basis for suggestions offered.  Specifically, the NRC staff requests comment on the following questions:

  1. The United States does not have a formal regulatory definition of VLLW. What should the NRC consider in developing its own regulatory definition for VLLW?  Is there another definition of VLLW that should be considered?  Provide a basis for your response.
  1. The existing regulatory framework within 10 CFR 61.55 divides low-level radioactive waste into four categories: Class A, Class B, Class C, and GTCC. Should the NRC revise the waste classification system to establish a new category for VLLW?  What criteria should NRC consider in establishing the boundary between Class A and VLLW categories?
  1. The NRC’s alternative disposal request guidance entitled, ‘‘Review, Approval, and Documentation of Low- Activity Waste Disposals in Accordance with 10 CFR 20.2002 and 10 CFR 40.13(a),’’ which is undergoing a revision, allows for alternative disposal methods that are different from those already defined in the regulations and is most often used for burial of waste in hazardous or solid waste landfills permitted under the Resource Conservation and Recovery Act (RCRA). Should the NRC expand the existing guidance to include VLLW disposal or consider the development of a new guidance for VLLW disposal?  Why or why not?
  1. If the NRC were to create a new waste category for VLLW in 10 CFR Part 61, what potential compatibility issues related to the approval of VLLW disposal by NRC Agreement States need to be considered and addressed? How might defining VLLW affect NRC Agreement State regulatory programs in terms of additional responsibilities or resources?
  1. Following the Low-Level Radioactive Waste Policy Amendments Act of 1985, states formed regional compacts for the disposal of low-level radioactive waste. If the NRC were to create a new waste category for VLLW, does it fall within regional compact authority to control VLLW management and disposal?  How might defining VLLW affect regional compacts in terms of additional responsibilities or resources?
  1. U.S. Environmental Protection Agency (EPA)-imposed waste analysis requirements for facilities that generate, treat, store and dispose of hazardous wastes are defined in 40 CFR Parts 264 through 270. How would NRC incorporate and apply waste analysis requirements for VLLW at RCRA Subtitle C and D facilities?  Should the NRC impose concentration limits and/or treatment standards for VLLW disposal?
  1. Are there any unintended consequences associated with developing a VLLW waste category?
  1. What analytical methods/tools should be used to assess the risk of disposing of VLLW at licensed low-level radioactive waste disposal facilities or RCRA Subtitle C and D facilities — i.e., generic or site- specific?
  1. How should economic factors be considered in the VLLW scoping study?

Submitting Comments

Interested stakeholders may submit comments by any of the following methods:

  •   Mail comments to:  May Ma, Office of Administration, Mail Stop: OWFN–2– A13, U.S. Nuclear Regulatory Commission, Washington, DC 20555– 0001.

Background

In 2007, following developments in the national program for low-level radioactive waste disposal, as well as changes in the regulatory environment, the NRC conducted a strategic assessment of its regulatory program for low-level radioactive waste.  The results of this assessment were published in late 2007 in SECY–07–0180, “Strategic Assessment of Low-Level Radioactive Waste Regulatory Program.”  The strategic assessment identified the need to coordinate with other agencies on consistency in regulating low activity waste (LAW) disposal and to develop guidance that summarizes disposition options for low-end materials and waste.

In 2016, the NRC staff conducted a programmatic assessment of the low-level radioactive waste program to identify and prioritize tasks that the NRC could undertake to ensure a stable, reliable and adaptable regulatory framework for effective low-level radioactive waste management.  The results of this assessment were published in October 2016 in SECY–16–0118, “Programmatic Assessment of Low-Level Radioactive Waste Regulatory Program.”  The programmatic assessment identified the need to perform a LAW scoping study as a medium priority.

In International Atomic Energy Agency (IAEA) Safety Guide No. GSG– 1, “Classification of Radioactive Waste,” the IAEA defines VLLW as waste that does not meet the criteria of exempt waste, but does not need a high level of containment and isolation and is therefore suitable for disposal in a near surface landfill type facility with limited regulatory control.  The NRC currently does not have a formal regulatory definition for VLLW, nor has it adopted the IAEA definition.  However, the NRC uses the term VLLW consistent with the international regulatory structure.  In general, the NRC considers VLLW as material containing some residual radioactivity, including naturally occurring radionuclides that may be safely disposed of in hazardous or municipal solid waste landfills.

The LAW scoping study, which was later renamed the VLLW scoping study, will combine several tasks initially defined in the 2007 strategic assessment into one. These tasks include:

  • coordinating with other agencies on consistency in regulating LAW;
  • developing guidance that summarizes disposition options for low-end materials and waste; and,
  • promulgating a rule for disposal of LAW.

As part of the scoping study, the NRC will also evaluate regulatory options that would define the conditions under which LAW, including mixed waste, could be disposed of in Resource Conservation and Recovery Act (RCRA) Subtitle C hazardous waste facilities.

Consistent with SECY–16–0118, the NRC is conducting this VLLW Scoping Study, which will consider disposal of waste as defined by 10 CFR Part 61 as the isolation, by emplacement in a land disposal facility, of radioactive wastes from the biosphere that is inhabited by man and that contains his food chains.  As such, the scoping study will not address non-disposal related disposition pathways including unrestricted release, clearance, reuse or recycle of materials.

The purpose of the VLLW scoping study is to identify possible options to improve and strengthen the NRC’s regulatory framework for the disposal of the anticipated large volumes of VLLW associated with the decommissioning of nuclear power plants and waste that might be generated by alternative waste streams that may be created by fuel reprocessing or a radiological event.  Additionally, the NRC plans to evaluate regulatory options that could define the conditions under which VLLW, including mixed waste, could be disposed of in RCRA hazardous waste facilities.

For additional information, please contact Maurice Heath of the NRC’s Office of Nuclear Material Safety and Safeguards (NMSS) at (301) 415–3137 or at Maurice.Heath@nrc.gov.