ML20081J984

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Rev 3 to EDA-1, Procedure for Estimating Food Chain Doses Under Post-Accident Conditions
ML20081J984
Person / Time
Site: Oconee, Mcguire, Catawba, McGuire  Duke Energy icon.png
Issue date: 06/10/1991
From: Harris R
DUKE POWER CO.
To:
Shared Package
ML15224A894 List:
References
EDA-1, NUDOCS 9106240334
Download: ML20081J984 (12)
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Text

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h CRISIS MANAGEMENT PLAN IMPLEMENTING PROCEDVRE EDA-1

" Procedure for Estimating Food Chain Doses Under Post-Accident Conditions" E & S//#/;7/

Approved by: Date l

Rev. 3 June 5, 1991 l

9106240334 910617 PDR ADOCK 05000269 F PDR

IMPLEMENTING PROCEDURE FOR ESTIMATING FOOD CHAIN DOSES UNDER POST-ACCIDENT CONDITIONS CRISIS MANAGEMENT CENIER 1.O l'urA031 The determination of potential areas of concern in the ingestion pathway under post-accident conditions will be made by the Radiological Assessment Manager, based initially upon station releases, prevailing meteorological and hydrological conditions, and confirmatory measurements of dose rates and air sample results by field monitoring teams (when availab'e).

This procedure describes the method to be used in order to estimate offsite doses through significant food chain dose pathways under post-accident conditions. It is to be used only under the direction of the Radiological Assessment Manager.

2.0 Referents 2.1 U.S. NRC Reg. Guide 1.109.

3.0 Limits and Precautions 3.1 Reg. Guide 1.109 is intended to guide the calculation of doses under long term steady state conditions. The body of this procedure contains notes covering cases in which the calculation of doses under accident conditions differs from the calculation of doses under routine conditions.

3.2 This procedure covers only the calculation of the food chain pathway doses most likely to be limiting under post-accident conditions.

Other food chain doses must be calculated using the methods of the Duke Power Company Offsite Opj.e Calculation Manual or Reg. Guide 1.109. General Office Health Physics personnel shall b consulted when these other food chain doses are calculated.

3.3 The errors in the doses calculated through the use of this procedure are not necessarily conservative (on the high side).

3.4 The assumptions outlined in this procedure shall be carefully compared with existing post-accident conditions before this procedure is used.

3.5 This procedure calculates doses by relating concentration to the uptake by the individual and the associated dose factor (mrem /pC1).

3.6 It is expected that the samples will be collected by off-site monitoring teams under the direction of the Field Monitoring Coordinator, l

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3.7 Consider carefully the application of this procedure to ncr-'teady state conditions.

4.0 procedure-4.1 Vegetation 4 Cow or Goat Milk 4 Consumer Dose pathway for )

Radioiodine.

4.1.1 Assumptions

Child (Infant) milk consumption: 900 ml/ day (2 pints approx.)

Adult milk consumption: 850 ml/ day (2 pints approx.)  :

Decay time between iodine deposition on vegetation and milk consumption: 2 days.

All (100%,) of the milk aninals' feed is fresh pasture vegetation; if this is known not to be the case, calculate the concentration eaten by the animal by multiplying the concentration in the pasture vegetation by the fraction of feed which is fresh pasture vegetation.

The contribution to dose of I-132 and 1-134 is negligible because of the short half-lives anu small dose factors for these radionuclides. ,

4,1,2 Doses can be calculated on the basis of radiotodine concen-trations measured in or on either- grass (or other vegetation consumed by milk animals) or milk. Doses calculated on basis of milk radioiodine concentrations will be much more accurate than those calculated on the basis of vegetation radiotodine '

concentrations. However, the measurement of vegetation radioiodine concentrations permits the prediction of approximate doses due to milk consumption one or two days '

later.

Follow-up vegetation radiciodine analysis with milk radio-iodine analysis for several days to ensure accurate dose assessments.

4.1.3 Calculation of doses through vegetation analysis:

b 4.1.3.1 Collect samples of vegetation eaten by milk animals and analyze on Gell counter. Compute radiciodine concentrations in pCi/ gram of undried vegetation.

NOTE: All calculations for vegetation samples are l- done for cows; however, if the dose from goat milk is desired, simply multiply the dose from cow milk ingestion by 1.2.

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t 4.1.3.2 Calculate thyroid doses by use of the following equations:

DTCV = 3200 CI-131v + 180 07 333y + 1.1 C3.33$y D TAV = 420 Cj .333y + 20 C3 .333y + 0.1 Cl-135v where:

D TCV

= Human child (infant) thyroid dose commitment in Rems per day milk animal consumes contaminated vegetation.

D TAV

= Same as above for human adult.

Cg .333y = Concentration of I-131 in vegetation (pC1/g).

C3 .333y = Concentration of 1-133 in vegetation (pC1/g).

C I-135v

= Concentration of I-135 in vegetation (pC1/g).

4.1.4 Calculation of doses through milk concentrations:

4.1.4.1 Collect samples of milk and analyze on GeLi counter.

Compute radiciodine concentrations in pCi/ml.

. 4.1.4.2 Calculate thyroid doses by use of the following equations.

D TCM = 13000 Cg .333,+ 3000 CI-133m + 590 Cl-135m D TAM = 1700 Cg .33), + 300 Cl-133m + 65 CI-135m where:

D TCH

= Human child (infant) thyroid dose commitment in Rems per day of consumption of contaminated milk.

D TAM

= Same as above for human adult.

C3 .131m

= Concentration of I-131 in milk (pC1/ml).

1 C

I-133m

= Concentration of 1-133 in milk I (pCi/ml).

C I-135m

= Concentration of I-135 in milk (pCi/ml).

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NOTE: Whole body doses due to radiciodine ingestion will always be much smaller than the thyroid dose. '

4.2 Drinking Water . Consumer Pathway for Radiotodine.

4.2.1 Assumptions

Child (infant) water consumption: 900 ml/ day (2 pints approx.)

Adult water consumption: 2000 ml/ day (4 1/3 pints approx.)

Decay time in water distribution system: 1 day.

The contribution to dose of I-132 and I-134 is negligible because of the short half-lives and small dose factors of these radionuclides. '

4.2.2 Calculation of doses through water concentrations:

4.2.2.1 Collect water samples and analyze on GeLi counter.

Compute radiotodine concentrations in pCf/ml.

4.2.2.2 Calculate thyroid doses by use of the following equations:

UTCW = 12000 C;,333,4 1400 Cl-133w + 50 Cl-135w UTAW = 3700 CI-135w + 320 C7 .333, + 12 C;.335, where:

D TCW

= Human child (infant) thyroid dose commitment in Rems per day of consumption of contaminated water.

D TAW = Same as above for human adult.

C I-131w = Concentration of I-131 in water (pC1/ml).

C l-133w = Concentration of 1-133 in water (pC1/ml).

l.

C I-135w = Concentration of I-135 in water i (pC1/ml).

NOTE: Whole body doses due to radiciodine ingestion will always be much smaller than the thyroid dose.

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4.3 Water -+ Fish Consumer Pathway for Radiocesium

4.3.1 Assumptions

Child (teen) fish consumption: 44 g/ day (lh ox. approx.)

Adult fish consumption: 56 g/ day (2 oz. app .)

Bioaccumulation factor for cesium in fish: 2000.

The contribution to dose of Cs-138 is negligible because of its short half-life and small dose factor.

4.3.2 Doses can be calculated on the basis of radiocesium concen-trations in either water or fish. Doses calculated on the basis of concentrations in fish will be more accurate than those calculated on the basis of concentrations in water.

However, the measurement of water radiocesium concentrations permits the prediction of doses due to future consumption of fish.

4.3.3 Calculation of doses through water analysis:

4.3.3.1 Collect water samples and analyze on Geli counter.

Compute radiocesium concentrations in uCi/ml.

4.3.3.2 Calculate whole body doses by use of the following equatioas:

DBCW = 8000 CCs-134w + 2000 CCs-136w + 4600 CCs-137w OBAW = 14000 CCs-134w + 220J CCs-136w + 8200 C

Cs-137w where:

D BCW

= Human child (teen) whole body dose commitment in Rems per day fish are exposed to contaminated water.

D BAW

= Same as above for human adult.

D Cs-134w

= Concentration of Cs-134 in water (pCi/ml).

C Cs-136w = Concentration of Cs-136 in water (pCi/ml).

C Cs-137w

= Concentration of Cs-137 in water (pCi/ml).

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i 4.3.4 Calculations of doses through fish concentrations:

4.3.4.1 Collect fish samples and analyze on GeLi counter.

Compute radiocesium concentrations in pCi/ gram (wet weight). i 4.3.4.2 Calculate whole body doses b) use of the following equations:

DBCF = 4.0 CCs-134F + 1.0 CCs-136F + 2.3 CCs-137F DBAF = 6.9 CCs-134F + 1.1 CCs-136F + 4.1 CCs-137F where: ,

D BCF

= Human child (teen) whole body dose commitment in Rems per day of consumption (at 44 g/ day) of con-taminated fish.

D BAF

= fluman adtit infinity whole body dose commitment in Rems per day of consumption (at 57 g/ day) of contaminated fish.

C Cs-134F = Concentration of Cs-134 in fish (pCi/g).

C Cs-136F = Concentration of CS-136 in fish l; (pC1/g).

C Cs-137F = Concentration of Cs-137 in fish (pC1/g).

l NOTE: In any one day, a person may easily consume 5 or even 10 times the assumed daily quantity of fish.

l Liver doses due to radiocesium ingestion are about two times the whole body doses. The whole body dose limit is 5 Rems, and the dose limit for the liver is 15 Rems; therefore, the whole body doses are limiting.

-5.0- Enclosures 5.1 _ Food Chain Dose Calculations Worksheet t

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Enclosure 5.1 FOOD CHAIN DOSE CALCULATIONS WORKSHEET

, Date: Performed By:

1. Dose to Thyroid from Radiciodine A. Vegetation 4 Cow or boat Milk + Consumer Dose Pathway
1. Vegetation Analysis: Date Sampled Location Multiplying Factor Age Isotope Concentration In [ Igm /d) Dose Grayn (1- 1 Veaetation (uCi/g) (uCi/a) (rem /d)

Child 131

  • 3200** =

(In- 133

  • 180** =

fant) 135

  • 1.1** =

Total Dose =

Adult 131

  • 420** =

133 20** =

135

  • 0.1** =

NOTE: Dose is per day animals eat Total Dose =

contaminated vegetation.

    • All multiplying factors for vegetation are for cow milk, if the dose from goat milk is desired, multiply the dose from cow milk calculations by 1/2.
2. Milk Analysis: Date Sampled Location Multiplying Factor Age Isotope Concentration In (rem /d.) Dose Graun (I- ) Milk (uCi/a) _( uCi/ml) (rem /d)

Child 131

  • 13000 =

(In- 133

  • 3000 =

fant) 135

  • 540 =

Total Dose =

1

4 4 Enclosure 5.1 (cont'd)

Adult 131

  • 1700 =

133 300 =

-135 65 =

Total Dose =

B. Drinking water 4 Consumer Dose Pathway:

Date Sampled Location Multiplying Factor Age Isotope Concentration In (rem /d) Dose Gmna (I- i _Wa t er (uC1/ntll. (uCi/ml) (rem /d)

Child 131

  • 12000 =

(In- 133

  • 1400 =

fant) 135

  • 50 =

Total Dose =

Adult 131

  • 3700 =

133 320 =

135 12 =

Total Dose =

II, Dose to Whole Body from Radiocesium:

A. Water 4 Fish 4 Consumer Dose Pathway

1. Water Analysis: Date Sampled Location Multiplying Factor Age Isotope Concentration In frem/d) Dose

, Group (Cs- 1) Water (uti/ml)__ (uti/ml) (rem /d)

Child 134

  • 8000 =

(Teen) 136 2000 =

137 4600 =

Total Dose =

8

G Enclosure 5.1 ( cont'd)

Adult 134

  • 14000 =

136 2200 =

137 8200 =

NOTE: Dose is per day fish are exposed to Total Dose =

contaminated water.

2. Fish Analysis: Date Sampled Location Multiplying Factoi Age Isotope Concentration In (rem /d) Dose Gr2MR (Cs- 1 Fish (uCi/c) (pCi/a) (rem /d) ,

Child

  • 4,0 =

134 (Teen) 136 . 1.0 =

137 2.3 =

Total Dose = _,

Adult 134

  • 6.9 = . _ _

136

  • 1,1 = ,

137 4,1 =

Total Dose =

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DUKE POWER COMPANY EMERGENCY DOSE ASSESSMENT MANUAL June 6, 1991 i

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TABLE OF CONTENTS EDA-1 Procedure for Estimating Food Chain Doses Under Post-Accident Conditions (Rev. 3)

EDA-2 Off-Site Dose Projections for Catawba Nuclear Station (Rev. 6)

EDA-3 Off-Site Dose Projections for McGuire Nuclear Station (Rev. 8)

EDA-4 Off-Site Dose Projections for Oconee Nuclear Station (Rev. 6)

EDA-5 Mesorem, Jr. Atmospheric Dispersion and Dose Assessment Model Users Manual, Version 4A Catawba (Rev. 0)

EDA-6 Mesorem, Jr. Atmospheric Dispersion and Dose Assessment Model Users Manual, Version 4A McGuire (Rev. 0)

EDA-7 Mesorem, Jr. Atmospheric Dispersion and Dose Assessment Model Users Manual, Version 4A Oconee (Rev. 0)

EDA-8 Environmental Monitoring for Emergency Conditions for Catawba Nuclear Station (Rev. 6)

EDA-9 Environmental Monitoring for Emergency Conditions for McGuire Nuclear Station (Rev. 8)

EDA-10 Environmental Monitoring for Emergency Conditions for Oconee Nuclear Station (Rev. 1)

June 6, 1991 l

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