NG-20-0037, Correction to the 2018 Annual Radiological Environmental Operating Report

Correction to the 2018 Annual Radiological Environmental Operating Report

ML20128J289
Person / Time
Site:	Duane Arnold
Issue date:	05/07/2020
From:	Dean Curtland NextEra Energy Duane Arnold
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NG-20-0037
Download: ML20128J289 (3)

Text

NEXTera ENERGY .

DUANE ARNOLD May 7, 2020 NG-20-0037 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Duane Arnold Energy Center Docket No. 50-331 Renewed Op. License No. DPR-49 Correction to the 2018 Annual Radiological Environmental Operating Report The 2018 Annual Radiological Environmental Operating Report was provided to the NRC on May 14, 2019, ADAMS Accession No. ML19134A051. That report contained a typographical error such that the table heading on page E-3 cited 2017 when it should have cited 2018. NextEra Energy Duane Arnold, LLC has determined the error to be small in accordance with Regulatory Guide 1.21, Revision 2, Section 7.1. The affected page has been corrected and a copy is enclosed. The correction is indicated with a revision bar.

This letter makes no new commitments or changes to existing commitments .

Should you have any questions regarding this matter, please contact Michael Casey at (319) 851-7606.

<;)~2 Dean Curtland Director, Site Operations NextEra Energy Duane Arnold , LLC Enclosure cc: Administrator, Region 111, USNRC Project Manager, DAEC, USNRC Senior Resident Inspector, DAEC, USNRC

Enclosure to NG-20-0037 Duane Arnold Energy Center Corrected Page E-3 of the 2018 Annual Radiological Environmental Operating Report 1 page follows

5.) The skin dose equivalent to the hypothetical maximally exposed individual from noble gases was 0.00520 mrem, at 1,760 meters towards the North.

6.) The hypothetical maximally exposed organ due to airborne iodines and particulates with half-lives greater than eight days (excluding carbon-14) was the lungs of a child at 974 meters towards the West-Southwest, with an estimated dose equivalent of 0.00674 mrem.

7.) The hypothetical maximally exposed organ due to airborne carbon-14 was the bone of a child located 4,022 meters to the West-Northwest of the site. The dose was 0.115 mrem.

Conclusion No measurable dose due to the operation of the DAEC or the DAEC ISFSI was detected by environmental TLDs in 2018. The calculated doses are below the regulatory limits stated in Appendix I to 10CFR50, 40CFR190, and 10 CFR 72.104.

Estimated Maximum Offsite Individual Doses for 2018 Type Age Distanc Direction Dose or Dose Annual 10 CFR 50, Group e Equivalent Appendix I "Limit" (meters) (mrem)

Direct Radiation None *

(as measured by TLDs)

Liquid Releases Whole Body Dose Child D* SE 0.0301 mrem 3mrem Organ Dose Child- D* SE 0.0301 mrem 10 mrem Liver Noble Gas Gamma Air Dose 481 SSE 0.00269 mrad 10 mrad Beta Air Dose 2,416 N 0.00016 mrad 20 mrad Whole Body All 1,760 N 0.00510 mrem 5 mrem Skin Child 1,760 N 0.00520 mrem 15 mrem Particulates & Iodines Organ Dose Child- 974 WSW 0.00647 mrem 15 mrem Lunqs Carbon 14 Organ Dose Child- 4,022 WNW 0.115 mrem 15 mrem Bone

• There is no Appendix I limit for direct radiation. Compliance with 40 CFR 190 limits of 25 mrem whole body and 75 mrem thyroid is demonstrated in the Duane Arnold Energy Center 2018 Annual Radiological Environmental Operating Report, subsections "Ambient Radiation (TLDs)" and "ISFSI Facility Operations Monitoring".

D* Receptor location is aquatic pathway at Cedar River, See Offsite Dose Assessment Manual, ODAM, figure 3-2.

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