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RG-1.21 & RG-4.1RG-1.21 & RG-4.1
Steve Garry and Richard ConatserSteve Garry and Richard ConatserPresented at the RETS-REMP WorkshopPresented at the RETS-REMP Workshop
South Bend, INSouth Bend, IN
22-Jun-200922-Jun-2009
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IntroductionIntroduction
Rev 1 of RGs are 35 years old Rev 2 of RGs were just published We have made some changes We want to introduce the RGs The RGs are risk-informed We will present significant changes
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Outline - RG 1.21Outline - RG 1.21 RG 1.21
Release Points (and sample frequency)
Principal Radionuclides (and LLD) C-14 Leaks and Spills Dose Assessments ARERR
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Outline - RG 4.1Outline - RG 4.1 RG 4.1
REMP Exposure Pathways AREOR
Conclusion
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Significant Release Significant Release PointPoint
Identify your sig. release points
Sample them appropriately Include them in your RECP Update the ODCM if
necessary
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Significant Release Significant Release PointPoint
Activity > 1% of total for type of effluent 3 types of effluents listed in App I
Liquid Gaseous – Noble gases Gaseous – Other (Iodine, Particulate, H-3)
List Significant Release Points in ODCM Update the list periodically
Update list if necessary Select data collection interval (e.g, 3 mo., fuel cycle) Update within ~1 year if significant changes noted
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Less-significant Less-significant Rel. Pt.Rel. Pt.
Activity ≤ 1% of total for type of effluent
3 types of effluents listed in App I Liquid Gaseous – Noble gases Gaseous – Other (Iodine, Particulate, H-3)
List in site documentation Purpose (benefit) of classification
Discretion for sampling frequency Bounding calculation may be used Advantages with respect to Abnormal Releases
Release Points
Significant Release Point
Less Significant Release Point
GRW
LRWLRW
LRWLRW
Significant Release Point
SampleFrequency
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Principal Principal RadionuclideRadionuclide
Identify your principal nuclides
Analyze them appropriately Include them in your RECP Update the ODCM
periodically
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Principal Principal RadionuclideRadionuclide
Activity > 1% of total (for effluent type); OR Dose > 1% of App I (for effluent type)
3 types of effluents listed in App I Liquid Gaseous – Noble gases Gaseous – Other (Iodine, Particulate, H-3)
List Principal Nuclides in ODCM Update the list periodically
Select data collection interval (e.g., 3 mo., fuel cycle) Update within ~1 year if significant changes noted
Plant conditions may cause nuclide changes
Significant Releases, Principal Nuclides
Significant Release Point
Less Significant Release Point
GRW
LRWLRW
LRWLRW
Significant Release Point
Pn1
Pn2
…Pnn
Pn1
Pn2
…Pnn
Pn1
Pn2
…Pnn
Pn1
Pn2
…Pnn
LLDs
Pn1
Pn2
…Pnn
Pn1
Pn2
…Pnn
SampleFrequency
Principal Nuclide
Significant Releases, Nuclides, Pathways
Significant Release Point
Less Significant Release Point
GRW
LRWLRW
LRWLRW
Significant Release Point
Pn1
Pn2
…Pnn
Pn1
Pn2
…Pnn
Pn1
Pn2
…Pnn
Pn1
Pn2
…Pnn
LLDs
Pn1
Pn2
…Pnn
Pn1
Pn2
…Pnn
R1
R2
R3
R4
R4 R2
R5
There are ~ 14 routes of exposure in RG 1.109
SampleFrequency
ODCMFormula
Principal Nuclide
Sig. Exp. Pathway
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C-14C-14
Should be accounted for Can be estimated using NCRP-81
scaling factors, NUREG-0017, or measured
Incorporated into dose estimates C-14 does not need to be
monitored in REMP program
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RG 1.21 – Leaks and RG 1.21 – Leaks and SpillsSpills
Survey and assess the hazard Report releases and discharges Anticipate future discharges Document in 50.75(g) Report in ARERR:
Releases outside SSC Discharges to unrestricted area Data from monitoring wells
Basic Steps for GW Monitoring
SiteConceptual
Model
Sampling
SiteCharacter-
ization
Radionuclide Transport
Test theSCM
ModifyRad. Trans.
NewSamples
More Char.
Modify SCM
SCM appears adequateto predict
discharges
Samplesappear adequate
to predict discharges
Site Characterizationappears adequateto predict discharges
Radionuclidetransport appears adequate to predict discharges
Problem
ProblemP
roblem
Problem
All
OK
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Abnormal ReleaseAbnormal Release
Rev 1 used concept of abnormal release Abnormal = unplanned or uncontrolled Rev 1 only addressed off-site discharges Rev 2 separates “Releases” &
“Discharge” “Release” is to areas outside SSC “Discharge” is to unrestricted area
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RG 1.21 – Dose RG 1.21 – Dose AssessmentsAssessments
10 CFR 50 Appendix I 10 CFR 20 40 CFR 190
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RG 1.21 – Annual RG 1.21 – Annual ReportReport
Supplemental Information Abnormal Releases Qtr and yearly totals in the
tables Report all nuclides detected Report totals per RG 1.21 (3
digits)
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RG 4.1 - REMPRG 4.1 - REMP
RG 4.1 incorporates most concepts of NUREG-1301 and 1302
On-Site monitoring Surveys can be part of RG 1.21 Surveys can be part of REMP May impact REMP (LUC, REMP) Meet 20.1501 and 50.75(g)
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RG 4.1 – Exposure RG 4.1 – Exposure PathwaysPathways
Release pts vs. exposure pathway vs routes of exposure
Verify and update routes of exposure and sampling media
See examples in RG 4.1 “Routinely monitored” routes of exposure Include “other” routes of exposure if
significant Significant if ≥ 10% of total
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RG 4.1 – Exposure RG 4.1 – Exposure PathwaysPathways
Exposure Pathways Routes of exposure Other significant routes of
exposure (e.g., recreational hunting)
Gardens > 50 m2 usage factor Apply usage factor to meat
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RG 4.1 - AREORRG 4.1 - AREOR
Meteorological data kept on file Analysis of impact of leaks and
spills on REMP
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Questions? Questions? Comments?Comments?