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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?