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Home My WebLink AboutDRC-2020-020943 - 0901a06880dca556UTAH DIVISION OF WASTE MANAGEMENT AND RADIATION CONTROL RML # UT1900479 ENERGY FUELS RESOURCES WHITE MESA MILL INSPECTION MODULE EM-01 SEMI-ANNUAL EFFLUENT MONITORING REPORT REPORTING PERIOD: January 1, 2020 through June 30, 2020 DRC-Z02.0- OZ09413 References: Utah Administrative Code R313-24-4; 10CFR40.65; Radioactive Materials License UT1900479; 10CFR20 Table II of Appendix B; NRC Regulatory Guide 4.14; 2007 License Renewal Application Inspector Russ Topham Date October 21, 2020 10CFR40.65(a)(1) requires the licensee to submit a report within 60 days after January 1 and July 1 of each year. The report must specify the quantity of each of the principal radionuclides released to unrestricted areas in liquid and in gaseous effluents during the previous six months of operation. 1. Did the licensee submit the report within 60 days of the end of the reporting period i.e., January 1" or July 1"? (10CFR40.65(a)(1)) Yes IZ No CI Comments: The Semi-Annual Effluent Monitoring Report for the 1" half of 2020 for the White Mesa Mill was submitted on August 28, 2020 Page 1 of 8 2. Were the stack samples analyzed for U-nat, 230Th, 226Ra and 21°Pb? (NRC Reg Guide 4.14) and Th- 228, Th-232 and Ra-228 (L.C. 11.9) Yes El No 13 Comments: Stack sampling occurred only during quarters when the stack was operated. 3. Were site boundary effluent air samples analyzed for U-nat, 230Th, 226Ra and 21°Pb? (NRC Reg Guide 4.14) and Th-232 (L.C. 11.9) Yes No 0 10CFR20 Appendix B Table 2 first paragraph states "The columns in Table 2 of this appendix captioned "Effluents," "Air," and "Water," are applicable to the assessment and control of dose to the public, particularly in the implementation of the provisions of § 20.1302. The concentration values given in Columns 1 and 2 of Table 2 are equivalent to the radionuclide concentrations which, if inhaled or ingested continuously over the course of a year, would produce a total effective dose equivalent of 0.05 rem (50 millirem or 0.5 millisieverts)." Comments: Sampling results were below ECLs for all analyzed isotopes at all monitoring locations for the last four quarters, and for the year. See the attached Particulate, Radon and Gamma Screening analysis for a summary of quarterly and annual data and a calculated dose at each of the high-volume air stations. Page 2 of 8 4. Were the site boundary effluent air sample results within applicable limits for U-nat, 230Th, 226Ra and 210Pb? (10CFR20 Table II of Appendix B) 10CFR20 Table II of Appendix B, ECL's: U-nat 9.0E14 µCi/ml in air 230Th 2 OE-14 pt.Ci/m1 in air 2261ta 9 3E13 ptCi/m1 in air 21opb 6 0E-13 pCi/m1 in air Yes No1=1 Comments: 5. Did the results of the effluent monitoring for this reporting period achieve the site's ALARA objective of 25% of the ECL's? (2007 License Renewal Application Vol. 1 Section 6.5; 10CFR20 Table II of Appendix B) 10CFR20 Table II of Appendix B, ECL's: U-nat .9.0E-14µCi/m1 in air.....25% = 2.25E-14 µCi/ml in air 230-rh 2.0E14 µCi/m1 in air.....25% = 5.15E15 pCi/m1 in air 226Ra 9.3E-13µCi/m1 in air.....25% = 2.33E13 p.Cilml in air 21opb 6.0E13 µCilml in air.....25% = 1.50E-13 µCi/ml in air Yes D No [S] Comments: See the attached Particulate, Radon and Gamma Screening analysis for a summary of quarterly and annual data and a calculated dose at each of the high-volume air stations. The summary compares total dose to the mill's ALARA goal and to the annual 100 mrem exposure limit. Page 3 of 8 6. Were Gamma Measurements (Minus Background) Collected at each Monitoring Station? Yes [Z] No ID N/A D Comments: 7. Were soil samples analyzed for U-nat, 226Ra and 210Pb? (NRC Reg Guide 4.14) Yes E] No Ej N/A Ej Comments: 8. Were vegetation samples analyzed for 226Ra and 210Pb? (NRC Reg Guide 4.14) and U-Nat and Th-232 (LC??) Yes M No Ill Comments: Page 4 of 8 9. Were radon samples (minus background) taken at Sample Stations BHV-1, BHV-2, BHV-4, BHV- 5, BHV-6, BHV-7 and BHV-8? (NRC Reg Guide 4.14) Yes [g] No 0 Comments: ECLs in 10 CFR 20 Appendix B Table 2 assume either no daughters present or 100% ingrowth. Calculated ECLs account for partial ingrowth using methodology in EPA 520/1-88-009 p. 2-20. Calculated ECLs result in maximum exposure of 25 mrem/yr vs. 50 mrem/yr using Table 2 value. Regulatory limit is 100 mrem/yr. See the attached Particulate, Radon and Gamma Screening analysis for a summary of quarterly and annual data and a calculated dose at each of the high-volume air stations. 10. Were radon samples analyzed for 222Rn? (NRC Reg Guide 4.14) Yes ii No D Comments: 11. Were the 222Rn results within the calculated ECL's for the yearly average results for the last four quarters? Yes N No E Comments: See the attached Particulate, Radon and Gamma Screening analysis for a summary of quarterly and annual data and a calculated dose at each of the high-volume air stations. Page 5 of 8 License Condition 11.2.D requires the licensee to utilize lower limits of detection in accordance with Section 5 of the NRC Regulatory Guide 4.14, as amended, for analysis of effluent and environmental samples. 12. Were lower limits of detection (LLD) for analysis of stack effluent samples 10% or less of the limits found in 10CFR20 Table II of Appendix B for U-nat, 230Th, 226Ra and 210Pb? (NRC Reg Guide 4.14) 10CFR20 Table II of Appendix B, ECL's: U-nat .9.0E-'4 p,Ci/m1 10% = pei/m1 230Th 2.0E-'4 µCi/m1 10% = 2.0E' µCi/ml 226Ra 9.3E4' uCi/m1 10% = 9.3E44 µCi/ml 210Pb 6 0E4' pCi/m1 10% = 6.0E' 1.1,Ci/m1 Yes El No El Comments: LLDs in the analytical reports are called CRDL or RLs and they are identical to the numbers listed above. 13. Were lower limits of detection (LLD) for analysis of site boundary air effluents within the limits listed in NRC Regulatory Guide 4.14 Section 5 for U-nat, 230Th, 226Ra and 210Pb? (NRC Reg Guide 4.14) NRC Regulatory Guide 4.14 Section 5 LLD values (in air): U-nat 1.0E-'6 p,Ci/m1 230Th 1 0E46 pEi/m1 226Ra 1 0E4' µCi/m1 nom 2 0E45 µCi/ml Yes 12 No Ej Comments: The LLDs from documented in the analytical report are: U-nat 1E-16, Th-230 1E-16; Ra-226 1E-16 ,& Pb-210 2E-15 Page 6 of 8 14. Were lower limits of detection (LLD) for analysis of site boundary soil samples within the limits listed in NRC Regulatory Guide 4.14 Section 5 for U-nat, 226Ra and 21°Pb? NRC Regulatory Guide 4.14 Section 5 LLD values (in soil): U-nat 2 0E4 µCi/g 226Ra 2 0E-7 µCi/g 21opb 2 0E4 µCi/g Yes El No N/A Comments: 15. Were lower limits of detection (LLD) for analysis of site boundary vegetation samples within the limits listed in NRC Regulatory Guide 4.14 Section 5 for 226Ra and 21°Pb? NRC Regulatory Guide 4.14 Section 5 LLD values (in vegetation): U-nat 2.0E-' µCi/kg 226Ra 5 0E-8 µCi/kg 21 lib 1 OE µCi/kg Yes El No El Comments: Page 7 of 8 Russ Topham Prepared By: Reviewed By: (Print Name) (Signature) 16. Were lower limits of detection (LLD) for analysis of radon samples within the limits listed in NRC Regulatory Guide 4.14 Section 5 for 2 22R11? NRC Regulatory Guide 4.14 Section 5 LLD values for radon: 222Rn 2 0E-'° ACi/m1 (0.2pCi/L) Yes El No El Comments: White Mesa Environmental Protection Manual Section 1.4, STACK EMMISIONS MONITORING PROCEDURES, sub-section 1.0, INTRODUCTION, states, "These sampling methods are also consistent with guidance contained in the U.S. Nuclear Regulatory Commission's Regulatory Guide 4.14, "Radiological Effluent and Environmental Monitoring at Uranium Mills." 17. Were the yellowcake dryer and packaging stacks sampled in accordance with Regulatory Guide 4.14 Section 2.1.1? Quarterly samples at North Yellowcake Dryer and Yellowcake Baghouse for: U-nat Semi-annual samples at North Yellowcake Dryer and Yellowcake Baghouse for: 230Th 226Ra 21cpb Yes No El Comments: Stack sampling occurred only during quarters where the associated stack or process was operated. /0/24/2a2-6, (Date) /t4/Aa2-0 (Date) Page 8 of 8 Year Ending 30-Jun-20 PARTICULATE, RADON AND GAMMA SCREENING Quarter Ending Analysis of Annual Dose Constituent Location 30-Sep-19 31-Dec-19 31-Mar-20 30-Jun-20 Annual ECL Below ECL? mrem/yr Ra di o a c tiv e P a r tic u la te s - _ 4..1 „ 6,AT • (pCi/mL) • BliVA 1.0E- 6 : :1,0E16 „.,• _ .0E17 4,0E47 7:0E-17 • 9E-14 Yes 0.04 BliV-2 , 2,0E-16 '= 2.0E-16 ,':,''' ZOE-17 2,0 -17 .1E1 1 9E-14 Yes 0.06 BI-IV4 - '. '1,0E16 , - , 10E1 6 t...: 4,0E47 4.0E-17 7,0E17 '9E44 Yes 0.04 6HV-5 ,„ „ 1.0E16 1.0E-16 4.0E-16 4.0E-16 2.5E-16 -- E14„ Yes 0.14 BHV-6 2.0E-16• ' • 2.0E-16 2.0E-16 2.0E-16 2.0E-16 • 9E-14 Yes 0.11 B1-1V-7 20E-16 2.0E-16 • 1.0E-16 1.0E-16 1.5E16 z-'-. 9E-14 Yes 0.08 . B4V-.8 • 1,0E-16; ,-, „ 1.0E-16 4.0E-17 : 4.0E17 7.0E-17 " 9E-14 Yes 0.04 " " h` " ." ' (LCl/ML) ',;•• - " - ' BHV4 5.0E-16 5.0E-16 3,0E17 • 3.0E47 2.7E46 " 2E44 Yes 0.66 ' 131-1V=2 ;.. 3.oE-17 .. 3.0E-17 = - -1.0E-17 1.0E-17 2.9E17 - '2E-14 Yes 0.05 -•BH,V-4 •1.0E-16 1:0E-16 „ „ 6.0E-17 6.0E-17 8.OE=I7 .• 2E14 • Yes 0.20 - BHV-5 • 1.0E-16 1.0E-16 30816 .0E-16 2.0E-16 " . 2E14 Yes 0.50 ::, B1-1\66 6,0E-17 :• 8.0E-17 .= ''-• 1.0E-16 . ; 1,0E-16 9.0E-17 ' 2E14 Yes 0.23 "BEIV-7 1.0E-16 , 1.0E-16 5.0E-17 5,0E-17 7.5E-17 . 2E14 Yes 0.19 BHV-8 :=2.0E-16 : 2.0E-16 .".4:6 ,17 • „4.0E17 1.2E-16 2E-14 Yes 0.30 ka (pCi/ML " •,• ' , BHV-1 8:0E-16 8.0E16 •6,0E17 „ 6,0E-17 4.3E-16 • 9E43, Yes 0.02 • BHV-2 ' 30E16 •: .•3.0E16 4.0E-17 'I • 4.0E17 1.7E16 •. 9E-13 Yes 0.01 B1-1V-4 9.0E-17 9.0E-17 4:0E-17 4.0E 7 1 6.5E-17, '',`,,, 9E-13 Yes 0.00 I., _ BHV-5 6.0E16 6.0E-16 4:0E-16 1 4.0E46 ' 5.0E16 - ", ::, 9E-13 Yes 0.03 ., , BHV-6 5.0E-17 :5.0E-17 10E-16 : .0E-16 7.5E-17 9E13 Yes 0.00 BHV-7 3.0E-16 3.0E-16 1.0E-16 1.0E16 • 2.0E16 ' • 9E13 Yes 0.01 - BHV-8 1.1E-15 1.1E15 10E16 "" ;1.0E16 , 6.0E16,, , 9E-13 Yes 0.03 70pki whey tt • "BHW1i . 1.0E14 1.0E-14 :;1.6E414 , 1.0E-14 1.0E44 6E13 Yes 0.83 BH 90E-15 9.0E-15 : 0.0E-15 ' 8.0E-15 8.5E-15 6E-13 Yes 0.71 BHV-4 : 1.10E17 :: 10E-17 ' ' : 90E-15 : 9.0E15 4.5E15 " 6E-13 Yes 0.38 BHV.,...5 9.0E45 •• 9.0E-15 • 9.0E-15 9.0E15 9.0E15 r: : 6E-1 Yes 0.75 'BFIV-6 ' 8,0E-15 ..8.0E15 1.0E44 1.0E-14 : 9.0E15 6Ei3 Yes 0.75 BHV-7 1.0E14 10E-14 : 10E14 : 1.0E44 '" . 1.0E-14 : v 6E-13 Yes 0.83 BHV43 :1:0E-14 :: 1.0E-14 ::.., :: 7.0E-15 7.0E-15 .5E-15 6513 Yes 0.71 • (1J Ciftrp BHV-1 • 7.0E18 •7.0E-18 • 3.0E-18 - 3,0E-18 .: - 5,0E48 4E-15 Yes 0.06 :BHV.i.2 9.0E-13 9.0E-18 •' 5.0E-18 ,... 5.0E-18 7.0E-18 4E-16 Yes 0.09 BHV-4 310E-18 310E-18 , '",''' 3OE418 : , 4 3.0E418 , - 3.0E418 4E-15 Yes 0.04 - :13HV•-5 6.0E-18 6.0E-1 , -,-,,,7.0E- 8 7.0E-18: 6.5E- 8 ' 4E-15 Yes 0.08 •' "13FIV-6 :4.0E-18 4.0E48 :,:: 4.0E-18 4,0E48 :4.0E; 8 ' 4E415 Yes 0.05 BHV-7 • 7.0E-18 :1 7.0E18 -"=:"--21.0618 : ." 2.0E18 4.5E 8 4E-15 Yes 0.06 BHV4,8 :0.0E-18 9.0E-18 - i,;=-2:0E-18 2.OE-18 5.5E- 8 4E15 Yes 0.07 I Di r e c t R a di a tio n I Y (mrem) BHV4: 5.00 5.00 5.00 5.00 20.00 100 Yes 20.00 :BI-1V-2 0.30 0.30 0.30 0.30 1.20 100 Yes 1.20 : -BI-IV-4 0.30 0.30 0.30 0.30 1.20 100 Yes 1.20 BF1V-5 2.20 2.20 2.20 2.20 8.80 100 Yes 8.80 , 7 '''''', B HV,:•'0 0.00 0.00 0.00 0.00 0.00 100 Yes 0.00 ' EIFIV-7 0.50 0.50 0.50 0.50 2.00 100 Yes 2.00 BHWO 0.00 0.00 0.00 0.00 0.00 100 Yes 0.00 I R a do n - 22 2 I 222[1n (pCi/L) • BHV4.1 0.00 0.00 0.00 0.00 0.00 0.07 Yes 0.04 BHV-2 0.00 0.00 0.00 0.00 0.00 0.34 Yes 0.02 •BHV-4 0.03 0.03 0.03 0.03 0.03 0.50 Yes 0.04 BHV.-.5 0.19 0.19 0.19 0.19 0.19 1.43 Yes 0.03 BHV,6 0.00 0.00 0.00 0.00 0.00 0.83 Yes 0.03 : BRvg 0.00 0.00 0.00 0.00 0.00 1.12 Yes 0.03 BHV 0.00 0.00 0.00 0.00 0.00 0.71 Yes 0.00 Su m ma r y Estimated Dose and Comparison to Screening Values (mrem/yr) Location Dose ALARA Goal ALARA Goal Met? Exposure Limit Compliant? ' HV-1 21.66 25 Yes 100 Yes B1-1V-2 2.14 25 Yes 100 Yes BI4V-4 1.90 25 Yes 100 Yes , BHV- 10.32 25 Yes 100 Yes BHV-6 1.17 25 Yes 100 Yes BHV-7 3.21 25 Yes 100 Yes BHV-8 1.15 25 Yes 100 Yes Notes: Regulatory limit is 100 mrem/yr. Energy Fuels ALARA goal is to maintain exposures below 25 mrem/yr ECLs in this analysis are based on 50 mrem/yr except radon which uses 25 mrem/yr. Table 2 ECLs are based on 50 mrem/yr. ECLs for radon were calculated using distance and wind speed from assumed stack source to BHV stations. Calculated ECLs provide inclusion of ingrowth of daughters. Annual values reflect averaging dose rates for the four quarters, except for gamma, which is the sum of four quarterly values. Reviewed by: Russ Topham 44,V Date: Manager review: Phil Goble pp,6 Date: Oki / , oAdOrio2e. Year Endin 31-Mar-20 PARTICULATE, RADON AND GAMMA SCREENING Quarter Ending Analysis of Annual Dose Constituent Location 30-Jun-19 30-Sep-19 31-Dec-19 31-Mar-20 Annual ECL Below ECL? mrem/yr I Ra di o a c tiv e Pa rtic u la te s I NAT (ii:di/rilL) • ' ,-, - ' 'BHV-1 6 .E.17 1.0E-16 10E16 4,0E-17 8.0E47 ::: 9E714 Yes 0.04 BHV-2 4.0E47 2.0E-16 ' 2LE-16 2,0E-17 12E-16 : : 9E-14, , Yes 0.06 BHV:4 10E46 1LE:16 10E16 4.0E-17 • 8,5E17 , 9E04 Yes 0.05 BHV-5 • -2.0E16 1.0E-16 1,0E-16 , 4.0E4 6 , 2.0E4 5 . ..:9E44 Yes 0.11 ' SHY-6 2.0E-16 2.0E-16 2.0E46- 2, E-16 2,0,E- 6 ,..,.9E14 Yes 0.11 .BHV-7 8.0E-17 .. - 2.0E-16 20E-16 - .1LE-16 1.5E-16 9E714, Yes 0.08 BHV-8 8:0E47 , 1.0E-16 ' .0E-16 • - '4:0E- .7. '-,8,0E17 9E-14 Yes 0.04 ;nom - - (pCi/mL)- . , • , BHV-1 • 5.0E-17 ,5.0E46 5,0E46 : .0E-17 '2,7E-16 2E-14 Yes 0.68 BHV-2 3.0E-17 3.0E-17 ' 3.0E-17 • 1OE-17 . :2.5E-17 2E14 Yes 0.06 BHV-4 ;9.0E-17 1.0E-16 , • 1.0E46 , , • 5,0E-17 8.8E-17 • 2E14 Yes 0.22 - BHV-5 1.0E-16 • 1.0E46 : . 1.0E-16 . A.0E-16 1.5E-16, ' 2E-14 Yes 0.38 BHV-6 1,LE16 ' ' 8.0E-17 , 8LE-17 -1;0E-16 '9',..0E-17 2E44 Yes 0.23 BHV-7 5.0E17 , 1.0E46 HILE-16 ' 00E47 „7.5E-17 • 2E-14 Yes 0.19 ,BHV:8 1LE:16 '' 2.0E-16 , ::, 2LE-16 :-',4LE-17 1AE-16 2E-14 Yes 0.34 - '., fuelm.0 , -1 - • . .s. HV4 E 1.0E16 8LE:16 8.0E-16 .'5-.0E1 7 4.4E-16 9E43 Yes 0.02 -';BHV-2 1.0E-16 ,,3.0E-16 -ADE-16 , 4.0E-17 1:9E-16 9E-13 Yes 0.01 • - BHV:4 80E-17 '90E-17 9,0E17 -, ;0:1E47 75E-17 :9E-13 Yes OLO -B 'HV-5 ' -- - 2.0E-16 6.0E-16 6.0E-16 , 4.0E-15 „4.5E15 : 9E-13 Yes 0.03 - ' BHV-6 1LE-16 5.0E47 'ALE-17 ' " 1,0E46 ' ; 7.5E-17' 9E43 Yes 0.00 BHV-7 6.0E-17 '3.0E-16 -10E16 ' , 1.0E46 - 1.9E-16 '-.V ".9E13 Yes 0.01 BHV-8 2.0E- 6 1.1E45 11E45 1.0E-16 6,3E16 '9E-13 Yes 0.03 ',210O 4ipi/rnL) BHV-1 10E14 1.0E14 ' 10E-14 10E-14 10E-14 ' 6E13 Yes 0.83 BHV-2 80E-15 90E-15 9.0E-15 80E-15 8.5E-15 ' . -:',6E43 Yes 0/1 „ B1W-4 1.0E-14 '1 LE-17 1,0E-17 9.0E-15 4.8E-15 6E43 Yes 0.40 BHV-5 2.0E-14 9:.0Eii15 - 9.0E-15L 9.0E-15 1.2E-14 6E-13 Yes 0.98 BNY-6 1.0E-14 '. 8LE-15 8LE-15 1LE-14 9LE-15 .' ,' ,' 6E1-3 Yes 0.75 BHV-7 1.0E-14 1.0E44 1.0E-14 .0E-14 1.0E-14 ' 6E43 Yes 0.83 BHV,8 .0E- 4 1.0E4141 1.0E-14 7.0E-15 9.3E-1 6E-13 Yes 0.77 viz r- ' 1.icum 4 -,BHV4 30E19. 7:0E18 . 70E-18 •„ 30E18 5.0E-18 - • 4E15 Yes 0.06 BHV-2 OE-1 9.0E48 ' 9.0E-18 -5.0E-18 - 8.0E-18 - - 4E-15 Yes 0.10 1,-JV-4 4.0E-18 3.0E-18 - • 3.0E-18 ' 3.0E-18 --33E-18 . ' ' 4E45 Yes 0.04 ' BHY-5 .0E48 6,0E-18 6.0E-18 , , 7.0E-18 5.5E-18 • • 4E-15 Yes 0.07 ;--BHV-6 2.0E:18" 4.0E-18 4,0E-18 4.0E-18 3.5E-18 4E-15 Yes 0.04 - SHV-7 ' 3.0E18 -; 7.0E18 , 7.0E-18 '' 2.0E18 4.8E48 '4E-15 Yes 0.06 'BI-1V-,8 ':: 2,0E-1,8 • ' 9.0E-18 "19LE-1B .2.-.0E-18 ' 55E-18 -'4E-15 Yes 0.07 I D i r e c t R a di a tio n 1 Y (mrem) BHV-1 5.00 5.00 5.00 5.00 20.00 100 Yes 20.00 BHV-2 0.30 0.30 0.30 0.30 1.20 100 Yes 1.20 BHV4 0.30 0.30 0.30 0.30 1.20 100 Yes 1.20 BHV 2.20 2.20 2.20 2.20 8.80 100 Yes 8.80 BHV 0.00 0.00 0.00 0.00 0.00 100 Yes 0.00 BHV-7 0.50 0.50 0.50 0.50 2.00 100 Yes 2.00 8HY 0.00 0.00 0.00 0.00 0.00 100 Yes 0.00 C \ I CsJ ° rc 222 Rn (pCi/L) BHV-1 0.00 0.00 0.00 0.00 0.00 0.07 Yes 0.05 BHV-2 0.00 0.00 0.00 0.00 0.00 0.34 Yes 0.02 B .14V4 0.03 0.03 0.03 0.03 0.03 0.50 Yes 0.03 BI4V;.5 0.19 0.19 0.19 0.19 0.19 1.43 Yes 0.02 BHY 0.00 0.00 0.00 0.00 0.00 0.83 Yes 0.03 • BHV-;77 0.00 0.00 0.00 0.00 0.00 1.12 Yes 0.03 BKV: 0.00 0.00 0.00 0.00 0.00 0.71 Yes 0.00 I Su m m a ry I Estimated Dose and Comparison to Screening Values (mrem/yr) Location Dose ALARA Goal ALARA Goal Met? Exposure Limit Compliant? BHV-1 21.69 25 Yes 100 Yes BHV-2 2.17 25 Yes 100 Yes ,. BI-IV-4 1.94 25 Yes 100 Yes BH\25 10.38 25 Yes 100 Yes BHV-6 1.16 25 Yes 100 Yes BHV-7 3.21 25 Yes 100 Yes ....,,BHY-A 1.26 25 Yes 100 Yes Notes: Regulatory limit is 100 mrem/yr. Energy Fuels ALARA goal is to maintain exposures below 25 mrem/yr ECLs in this analysis are based on 50 mrem/yr except radon which uses 25 mrem/yr. Table 2 ECLs are based on 50 mrem/yr. ECLs for radon were calculated using distance and wind speed from assumed stack source to BHV stations. Calculated ECLs provide inclusion of ingrowth of daughters. Annual values reflect averaging dose rates for the four quarters, except for gamma, which is the sum of four quarterly values. Date: 04/4.0124, Date: /6 ha tau Reviewed by: Russ Topham Manager review: Phil Goble pg.