ML12320A009

Alt Disposal Internal External Dose Revised

ML12320A009
Person / Time
Site:	Humboldt Bay
Issue date:	07/16/2012
From:	Pacific Gas & Electric Co
To:	NRC/FSME/DWMEP/DURLD
References
Download: ML12320A009 (3)

Text

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Attachment 4 Inadvertent Intruder Analysis - Construction Scenario USEI Inadvertent Intruder Dose Calculation Worksheet Customer. PG&E Humboldt Bay Power Plant Project Alternate Disposal Request #3 - Unit 3

,r NUREG-0752 G-57 PDCF-2 HfLife Dcy C Half Life Decay C.  % of year for Dose Isotope (mromfyr 5 Exposure I(trenyear)

IMr ,

F2t (years) Constant (Clim3)

Ni-63 I 2.48E+10 I 1.00E+02 0.0069 1 880E-06 1 0.812 I 1 I 2.84E-10 1 5.70% 1 2.87E-06 Pu-239' I 0.OOE+00 I 2.41E+04 0.0000 3.52E-06 0.999 3.52E-06 0.997 0057 1.32E-04 0.235 0.057 8.80E-06 1 0.953 0.057 Cm-243

... i --

4 -3.AAF+Ofl TOTAL 3k,*vUP+O Notes: I PDCF-5set to 0 for these nuclides either due to lack of gamma emissions.

The total dose to the inadvertent intruder is estimated using the following equation:

H = I (fofdfwf )aCwPDCF3 + I (fofdfwfs)Dnctimur s Cw PDCF, n n Etlanation of calculation and terms:

Radionuclide Specific Pathway Dose Conversion Factor - Intruder Construction Scenario - Air.

PDCF2 Source: NUREGICR-4370, Vol. 1 (most conservative transport class used)

Radionuclide Specific Pathway Dose Conversion Factor - Intruder Construction Scenario - Direct Gamma PDCF 5 Source: NUREGICR-4370, Vol. 1 (most conservative transport class used)

C, Radionuclide Concentration in Waste Activity fraction remaining after decay

1. fo = e-' where I is the the time period between the end of active disposal and the initiation of the scenario; the site closure plan for USEI ensures maintenance for 30 years after closure.

Dilution factor due to particular disposal practices fd 0.5 for random, 0.75 for stacked, or 0.5 for decontainerized. Fd set to 1 for this evaluation as USEI is not taking credit for dilution of these wastes as part of the Intruder scenario.

f. Waste form and Package Factor - No credit is taken for waste form or solidification Site Selection Factor f, = T_ x ExposureFittor T,_ = 2.53 x 10-o x(lO/v)x(s/30)x(50/PE)' = 2.81x lI0'o where:

v = 4.47 mns (average annual wind speed at Boise, ID Airport) a = 50% (default silt content of soil)

PE = 91 (default precipitation-evaporation index)

HBPP ADR#3 Concentrated RESRAD Model Calculations Input Parameters and Assumptions A Assumed Timeframe to Complete Project = 2 months 2 months 3

B1 Total HBPP Waste Volume 100,000 ft B2 3703.7 cy3 B3 2831.7 m 3

C1 HBPP Waste Density 55 lb/ft C2 0.88 g/cc D1 Mass of HBPP ADR#3 Waste Stream 5.50E+06 lb 3.87E+00 D2 2,750 tons 2.28E+00 E Average Annual Waste Received at USEI 725,000 tons F1 Average Monthly Waste received 60416.7 tons F2 1.21 E+08 lbs G1 Density of USEI waste cells (insitu) 1.5 g/cc3 G2 93.8 lb/ft 3

G3 1.65 tons/m 2

H Baseline RESRAD USEI Contamination Zone Area 88,221 m I Baseline RESRAD USEI Contamination Zone Depth 33.6 m Equations and Calculations 2

J Surface area for conentrated HBPP waste in USEI Landfill [=H/6] 14703.5 m (total area divided by 6 - for 2 month burial period) 3 K Volume of Total USEI Waste Received in 2 months [=E/(6*G3)] 73080 m (mass in tons converted to in situ m3)

L Dilution Factor for Concentrated HBPP Waste Stream [=B3/K] 3.87E-02 (based on volume)

(volume of HBPP ADR#3 / Volume of USEI 2-month total)

M Thickness of CZ in Conc. RESRAD Model [=K/J] 5.0 m N Dilution Factor for Concentrated HBPP Waste Stream [=D1/F2] 2.28E-02 (based on mass)

(mass of HBPP ADR#3 / Mass of USEI 2-month total)