Availability of Interagency Steering Committee on Radiation Standards' Reports on Radioactivity in Sewage Sludge and Ash, 22729-22730 [E5-2071]
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Federal Register / Vol. 70, No. 83 / Monday, May 2, 2005 / Notices
aquifer to established water-quality
standards following the cessation of insitu leach mining operations.
The NRC also requires licensees to
ensure that sufficient funds will be
available to cover the cost of
decommissioning their facilities. For
these uranium mines, restoration
generally consists of pumping specially
treated water into the affected aquifer
and removing the displaced water—and
thereby the undesirable contaminants—
from the system. Because groundwater
restoration can represent approximately
40 percent of the cost of
decommissioning a uranium leach
mining facility, a good estimate of the
necessary volume of treatment water is
important to estimate the cost of
decommissioning accurately.
The subject report, prepared for the
NRC by the U.S. Geological Survey,
summarizes the application of a
geochemical model to the restoration
process to estimate the degree to which
a licensee has decontaminated a site
where a leach mining process has been
used. Toward that end, this report
analyzes the respective amounts of
water and chemical additives pumped
into the mined regions to remove and
neutralize the residual contamination
using 10 different restoration strategies.
The analyses show that strategies that
used hydrogen sulfide in systems with
low natural oxygen content provided
the best results. On the basis of those
findings, this report also summarizes
the conditions under which various
restoration strategies will prove
successful. This, in turn, will allow
more accurate estimates of restoration
and decommissioning costs.
The subject report will be useful for
licensees and State regulators
overseeing uranium leach mining
facilities, who need to estimate the
volume of treatment water needed to
decontaminate those facilities.
Solicitation of Comments: The NRC
seeks comments on the report and is
especially interested in comments on
the utility and feasibility of the
modeling techniques described in the
report.
Comment Period: The NRC will
consider all written comments received
before June 17, 2005. Comments
received after July 17, 2005, will be
considered if time permits. Comments
should be addressed to the contact
listed below.
Availability: An electronic version of
the report is available in Adobe Portable
Document Format at https://
www.nrc.gov/reading-rm/doccollections/nuregs/contract/cr6870/
cr6870.pdf and can be read with Adobe
Acrobat Reader software, available at no
VerDate jul<14>2003
19:05 Apr 29, 2005
Jkt 205001
cost from https://www.adobe.com. Hard
and electronic copies are available from
the contact listed below.
FOR FURTHER INFORMATION CONTACT: Dr.
John D. Randall, Mail Stop T9C34, U.S.
Nuclear Regulatory Commission, 11545
Rockville Pike, Rockville, MD 20852,
telephone (301) 415–6192, e-mail
jdr@nrc.gov.
Dated at Rockville, Maryland, this 20th day
of April 2005.
For the Nuclear Regulatory Commission.
Cheryl A. Trottier,
Chief, Radiation Protection, Environmental
Risk & Waste Management Branch, Division
of Systems Analysis and Regulatory
Effectiveness, Office of Nuclear Regulatory
Research.
[FR Doc. E5–2073 Filed 4–29–05; 8:45 am]
BILLING CODE 7590–01–P
NUCLEAR REGULATORY
COMMISSION
Availability of Interagency Steering
Committee on Radiation Standards’
Reports on Radioactivity in Sewage
Sludge and Ash
AGENCIES: U.S. Nuclear Regulatory
Commission and U.S. Environmental
Protection Agency.
ACTION: Announce the issuance of two
final reports concerning radioactivity in
sewage sludge and ash.
This Federal Register notice
announces the availability of two final
reports, prepared by the Sewage Sludge
Subcommittee of the Interagency
Steering Committee on Radiation
Standards (ISCORS), addressing
radioactivity in sewage sludge and ash
at publicly owned treatment works
(POTWs). The first report, ‘‘ISCORS
Assessment of Radioactivity in Sewage
Sludge: Modeling to Assess Radiation
Doses,’’ assesses the potential levels of
radiation doses to people from
radioactivity in sewage sludge, by
modeling the transport of radioactivity
from sludge into the local environment.
The report also provides a complete
description and justification of the dose
assessment methodology. The second
report, ‘‘ISCORS Assessment of
Radioactivity in Sewage Sludge:
Recommendations on Management of
Radioactive Materials in Sewage Sludge
and Ash at Publicly Owned Treatment
Works,’’ is written for POTW operators.
This report is intended to (1) alert
POTW operators and others to the
possibility of radioactive materials
concentrating in sewage sludge and
incinerator ash, (2) inform operators
how to determine if there are elevated
levels of radioactivity in their sludge,
SUMMARY:
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Fmt 4703
Sfmt 4703
22729
and (3) assist POTW operators in
identifying further actions that may be
taken to reduce potential radiation
exposures from sludge and ash.
SUPPLEMENTARY INFORMATION:
Background
The purpose of ISCORS is to foster
early resolution and coordination of
regulatory issues associated with
radiation standards. Agencies
represented on ISCORS include the U.S.
Nuclear Regulatory Commission (NRC),
the U.S. Environmental Protection
Agency (EPA), the U.S. Department of
Energy, the U.S. Department of Defense,
the U.S. Department of Transportation,
the Occupational Safety and Health
Administration of the U.S. Department
of Labor, the U.S. Department of Health
and Human Services, and the
Department of Homeland Security. The
Office of Science and Technology
Policy, the Office of Management and
Budget, and State representatives may
be observers at meetings. The objectives
of ISCORS are to: (1) Facilitate a
consensus on allowable levels of
radiation risk to the public and workers;
(2) promote consistent and scientifically
sound risk assessment and risk
management approaches in setting and
implementing standards for
occupational and public protection from
ionizing radiation; (3) promote
completeness and coherence of Federal
standards for radiation protection; and
(4) identify interagency radiation
protection issues and coordinate their
resolution.
Discussion: There have been a number
of well-publicized cases of
radionuclides discovered in sewage
sludge and ash, and some of these have
led to expensive cleanup projects. These
incidents made clear the need for a
comprehensive determination of the
prevalence of radionuclides in sewage
sludge and ash at POTWs around the
country, and of the level of potential
threat posed to human health and the
environment by various levels of such
materials.
In response to this need, ISCORS
formed a Sewage Sludge Subcommittee
to coordinate, evaluate, and resolve
issues regarding radioactive materials in
sewage sludge and ash. To estimate the
amounts of radionuclides that actually
occur in sewage sludge and ash, the
Subcommittee performed a survey of
radioactivity in sludge and ash across
the United States. The final report of the
survey effort, ‘‘ISCORS Assessment of
Radioactivity in Sewage Sludge:
Radiological Survey Results and
Analysis’’ (ISCORS Technical Report
2003–02, NUREG–1775, EPA 832–R–
03–002, DOE/EH–0669), was issued in
E:\FR\FM\02MYN1.SGM
02MYN1
22730
Federal Register / Vol. 70, No. 83 / Monday, May 2, 2005 / Notices
November 2003 and is available on the
ISCORS Web site at https://
www.iscors.org.
The Subcommittee also undertook a
dose assessment to help assess the
potential threat that these materials may
pose to human health. The first final
report that we are issuing, ‘‘ISCORS
Assessment of Radioactivity in Sewage
Sludge: Modeling to Assess Radiation
Doses’’ (ISCORS Technical Report
2004–03, NUREG–1783, EPA 832–R–
03–002A, DOE/EH–0670), describes the
methodology and results of the dose
modeling effort. The radionuclides
considered were based on the results of
the ISCORS survey, and include
manmade and naturally-occurring
isotopes. The general approach used in
the report is a standard one that consists
essentially of two steps. First, seven
scenarios were constructed to represent
typical situations in which members of
the public or POTW workers are likely
to be exposed to sludge. Second,
assuming a unit specific activity of a
radionuclide in dry sludge,
environmental transport models were
employed to obtain doses. A draft of this
report was published for peer review
and public comment in November 2003.
Changes were made, as appropriate, to
address comments in developing the
final report.
The other major task of the
Subcommittee was to develop
recommendations for POTW operators.
The second final report being issued,
‘‘ISCORS Assessment of Radioactivity in
Sewage Sludge: Recommendations on
Management of Radioactive Materials in
Sewage Sludge and Ash at Publicly
Owned Treatment Works’’ (ISCORS
Technical Report 2004–04, DOE/EH–
0668, EPA 832-R–03–002B), is for use
by POTW operators in evaluating
whether the presence of radioactive
materials in sewage sludge could pose a
threat to the health and safety of POTW
workers or the general public. A draft of
this report was published for public
comment in November 2003. Changes
were made, as appropriate, to address
comments in developing the final
report.
Based on the survey and dose
modeling, ISCORS concludes that the
levels of radioactive materials detected
in sewage sludge and ash in the ISCORS
survey indicate that, at most POTWs,
radiation exposures to workers or to the
general public are not likely to be a
concern.
ADDRESSES: The two ISCORS reports on
radioactivity in sewage sludge and ash
being issued are available electronically
from the ISCORS Web page at: https://
www.iscors.org. Hard copies may also be
VerDate jul<14>2003
19:05 Apr 29, 2005
Jkt 205001
obtained by calling or writing to Duane
Schmidt, U.S. Nuclear Regulatory
Commission, NMSS/DWMEP/DCD, MS:
T–7E18, Washington, DC 20555–0001,
(301) 415–6919, or dws2@nrc.gov; or to
Robert Bastian, U.S. Environmental
Protection Agency, Office of Wastewater
Management (4204M), Rm. 7220B EPA
EAST, 1200 Pennsylvania Ave., NW.
Washington, DC 20460, (202) 564–0653,
or bastian.robert@epa.gov.
FOR FURTHER INFORMATION, CONTACT:
Duane Schmidt, U.S. Nuclear
Regulatory Commission, NMSS/
DWMEP/DCD, MS: T–7E18,
Washington, DC 20555, telephone (301)
415–6919, fax (301) 415–5398, e-mail
dws2@nrc.gov; or Robert Bastian, U.S.
Environmental Protection Agency,
Office of Wastewater Management
(4204M), Rm. 7220B EPA EAST, 1200
Pennsylvania Ave., NW., Washington,
DC 20460, telephone (202) 564–0653,
fax (202) 501–2397, e-mail
bastian.robert@epa.gov.
Dated at Rockville, Maryland, this 22nd
day of April, 2005.
For The U.S. Nuclear Regulatory
Commission.
Scott Flanders,
Deputy Director, Division of Waste
Management and Environmental Protection,
Office of Nuclear Material Safety and
Safeguards.
[FR Doc. E5–2071 Filed 4–29–05; 8:45 am]
BILLING CODE 7590–01–P
NUCLEAR REGULATORY
COMMISSION
Draft Report for Comment:
‘‘Documentation and Applications of
the Reactive Geochemical Transport
Model RATEQ,’’ NUREG/CR–6871
Nuclear Regulatory
Commission.
ACTION: Notice of availability and
request for comments.
AGENCY:
Background: The U.S. Nuclear
Regulatory Commission (NRC) uses
environmental models to evaluate the
potential release of radionuclides from
NRC-licensed sites. In doing so, the NRC
recognizes that, at many sites,
groundwater-related pathways could
contribute significantly to the potential
dose received by members of the public.
Consequently, consistent with its
mission to protect the health and safety
of the public and the environment, the
NRC uses contaminant transport models
to predict the locations and
concentrations of radionuclides in soil
as a function of time. Through this
notice, the NRC is seeking comment on
documentation of a subsurface transport
PO 00000
Frm 00104
Fmt 4703
Sfmt 4703
model developed for the NRC by the
U.S. Geological Survey (USGS) for
realistic transport modeling at sites with
complex chemical environments.
Because many radionuclides
temporarily attach, or adsorb, to the
surfaces of soil particles, their mobility
is reduced compared to that of
compounds that move with the
groundwater without interacting with
solid surfaces. As a result, most
subsurface-transport models used by the
NRC and its licensees estimate the
effects of the anticipated interactions
between radionuclides and solids in the
ground. Toward that end, these
subsurface-transport models use a
‘‘distribution coefficient,’’ which is
assumed to be constant and reflects the
proportion of radionuclide in the
groundwater compared to the
radionuclide associated with the solids
in the ground. These distribution
coefficients are widely used, and
consequently, the relevant literature
documents ranges of their values for
various soil types and radionuclides.
However, the documented ranges can be
very large because the chemical
reactions that cause radionuclides to
attach to solids are very sensitive to
water chemistry and soil mineralogy. As
a result, uncertainties in the parameters
used to characterize the adsorption of
radionuclides in soils have been
identified as a major source of
uncertainty in decommissioning,
uranium recovery, and radioactive
waste disposal cases evaluated by the
NRC.
Surface-complexation and ionexchange models offer a more realistic
approach to considering soilradionuclide interactions in
performance-assessment models. These
models can also account for variable
chemical environments that might affect
such interactions. The subject report,
prepared for the NRC by the USGS,
describes the theory, implementation,
and examples of use of the RATEQ
computer code, which simulates
radionuclide transport in soil and
allows the use of surface-complexation
and ion-exchange models to calculate
distribution coefficients based on actual
site chemistry.
The RATEQ code will help the NRC
staff define realistic site-specific ranges
of the distribution coefficient values
used to evaluate NRC-licensed sites. In
site-remediation cases, such as
restoration of the groundwater aquifer in
and around uranium in-situ leach
mining facilities, the RATEQ code can
aid in the estimation of restoration costs
by estimating the volume of treatment
water needed to restore sites to
acceptable environmental conditions.
E:\FR\FM\02MYN1.SGM
02MYN1
]]>Agencies
[Federal Register Volume 70, Number 83 (Monday, May 2, 2005)]
[Notices]
[Pages 22729-22730]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E5-2071]
-----------------------------------------------------------------------
NUCLEAR REGULATORY COMMISSION
Availability of Interagency Steering Committee on Radiation
Standards' Reports on Radioactivity in Sewage Sludge and Ash
AGENCIES: U.S. Nuclear Regulatory Commission and U.S. Environmental
Protection Agency.
ACTION: Announce the issuance of two final reports concerning
radioactivity in sewage sludge and ash.
-----------------------------------------------------------------------
SUMMARY: This Federal Register notice announces the availability of two
final reports, prepared by the Sewage Sludge Subcommittee of the
Interagency Steering Committee on Radiation Standards (ISCORS),
addressing radioactivity in sewage sludge and ash at publicly owned
treatment works (POTWs). The first report, ``ISCORS Assessment of
Radioactivity in Sewage Sludge: Modeling to Assess Radiation Doses,''
assesses the potential levels of radiation doses to people from
radioactivity in sewage sludge, by modeling the transport of
radioactivity from sludge into the local environment. The report also
provides a complete description and justification of the dose
assessment methodology. The second report, ``ISCORS Assessment of
Radioactivity in Sewage Sludge: Recommendations on Management of
Radioactive Materials in Sewage Sludge and Ash at Publicly Owned
Treatment Works,'' is written for POTW operators. This report is
intended to (1) alert POTW operators and others to the possibility of
radioactive materials concentrating in sewage sludge and incinerator
ash, (2) inform operators how to determine if there are elevated levels
of radioactivity in their sludge, and (3) assist POTW operators in
identifying further actions that may be taken to reduce potential
radiation exposures from sludge and ash.
SUPPLEMENTARY INFORMATION:
Background
The purpose of ISCORS is to foster early resolution and
coordination of regulatory issues associated with radiation standards.
Agencies represented on ISCORS include the U.S. Nuclear Regulatory
Commission (NRC), the U.S. Environmental Protection Agency (EPA), the
U.S. Department of Energy, the U.S. Department of Defense, the U.S.
Department of Transportation, the Occupational Safety and Health
Administration of the U.S. Department of Labor, the U.S. Department of
Health and Human Services, and the Department of Homeland Security. The
Office of Science and Technology Policy, the Office of Management and
Budget, and State representatives may be observers at meetings. The
objectives of ISCORS are to: (1) Facilitate a consensus on allowable
levels of radiation risk to the public and workers; (2) promote
consistent and scientifically sound risk assessment and risk management
approaches in setting and implementing standards for occupational and
public protection from ionizing radiation; (3) promote completeness and
coherence of Federal standards for radiation protection; and (4)
identify interagency radiation protection issues and coordinate their
resolution.
Discussion: There have been a number of well-publicized cases of
radionuclides discovered in sewage sludge and ash, and some of these
have led to expensive cleanup projects. These incidents made clear the
need for a comprehensive determination of the prevalence of
radionuclides in sewage sludge and ash at POTWs around the country, and
of the level of potential threat posed to human health and the
environment by various levels of such materials.
In response to this need, ISCORS formed a Sewage Sludge
Subcommittee to coordinate, evaluate, and resolve issues regarding
radioactive materials in sewage sludge and ash. To estimate the amounts
of radionuclides that actually occur in sewage sludge and ash, the
Subcommittee performed a survey of radioactivity in sludge and ash
across the United States. The final report of the survey effort,
``ISCORS Assessment of Radioactivity in Sewage Sludge: Radiological
Survey Results and Analysis'' (ISCORS Technical Report 2003-02, NUREG-
1775, EPA 832-R-03-002, DOE/EH-0669), was issued in
[[Page 22730]]
November 2003 and is available on the ISCORS Web site at https://
www.iscors.org.
The Subcommittee also undertook a dose assessment to help assess
the potential threat that these materials may pose to human health. The
first final report that we are issuing, ``ISCORS Assessment of
Radioactivity in Sewage Sludge: Modeling to Assess Radiation Doses''
(ISCORS Technical Report 2004-03, NUREG-1783, EPA 832-R-03-002A, DOE/
EH-0670), describes the methodology and results of the dose modeling
effort. The radionuclides considered were based on the results of the
ISCORS survey, and include manmade and naturally-occurring isotopes.
The general approach used in the report is a standard one that consists
essentially of two steps. First, seven scenarios were constructed to
represent typical situations in which members of the public or POTW
workers are likely to be exposed to sludge. Second, assuming a unit
specific activity of a radionuclide in dry sludge, environmental
transport models were employed to obtain doses. A draft of this report
was published for peer review and public comment in November 2003.
Changes were made, as appropriate, to address comments in developing
the final report.
The other major task of the Subcommittee was to develop
recommendations for POTW operators. The second final report being
issued, ``ISCORS Assessment of Radioactivity in Sewage Sludge:
Recommendations on Management of Radioactive Materials in Sewage Sludge
and Ash at Publicly Owned Treatment Works'' (ISCORS Technical Report
2004-04, DOE/EH-0668, EPA 832-R-03-002B), is for use by POTW operators
in evaluating whether the presence of radioactive materials in sewage
sludge could pose a threat to the health and safety of POTW workers or
the general public. A draft of this report was published for public
comment in November 2003. Changes were made, as appropriate, to address
comments in developing the final report.
Based on the survey and dose modeling, ISCORS concludes that the
levels of radioactive materials detected in sewage sludge and ash in
the ISCORS survey indicate that, at most POTWs, radiation exposures to
workers or to the general public are not likely to be a concern.
ADDRESSES: The two ISCORS reports on radioactivity in sewage sludge and
ash being issued are available electronically from the ISCORS Web page
at: https://www.iscors.org. Hard copies may also be obtained by calling
or writing to Duane Schmidt, U.S. Nuclear Regulatory Commission, NMSS/
DWMEP/DCD, MS: T-7E18, Washington, DC 20555-0001, (301) 415-6919, or
dws2@nrc.gov; or to Robert Bastian, U.S. Environmental Protection
Agency, Office of Wastewater Management (4204M), Rm. 7220B EPA EAST,
1200 Pennsylvania Ave., NW. Washington, DC 20460, (202) 564-0653, or
bastian.robert@epa.gov.
FOR FURTHER INFORMATION, CONTACT: Duane Schmidt, U.S. Nuclear
Regulatory Commission, NMSS/DWMEP/DCD, MS: T-7E18, Washington, DC
20555, telephone (301) 415-6919, fax (301) 415-5398, e-mail
dws2@nrc.gov; or Robert Bastian, U.S. Environmental Protection Agency,
Office of Wastewater Management (4204M), Rm. 7220B EPA EAST, 1200
Pennsylvania Ave., NW., Washington, DC 20460, telephone (202) 564-0653,
fax (202) 501-2397, e-mail bastian.robert@epa.gov.
Dated at Rockville, Maryland, this 22nd day of April, 2005.
For The U.S. Nuclear Regulatory Commission.
Scott Flanders,
Deputy Director, Division of Waste Management and Environmental
Protection, Office of Nuclear Material Safety and Safeguards.
[FR Doc. E5-2071 Filed 4-29-05; 8:45 am]
BILLING CODE 7590-01-P
