Text

Independent Spent Fuel Storage Installation (Isfsi), Annual Radiological Environmental Operating Report, and Changes to the Off-Site Dose Calculation Manual for 2024
	ML25049A124
Person / Time
Site:	La Crosse File:Dairyland Power Cooperative icon.png
Issue date:	02/17/2025
From:	Moe M; Dairyland Power Cooperative
To:	; Document Control Desk, Office of Nuclear Material Safety and Safeguards
References
	LAC-14572
	Download: ML25049A124 (1)
	v • d • e

Martin G. Moe ISFSI Manager February 17, 2025 LAC-14572 ATTN: Document Control Desk DAIRYlAND POWER COOPERATIVE 10 CFR 50.4 and 10 CFR 50.36a U.S. Nuclear Regulatory Commission Washington, DC 20555 - 0001 La Crosse Boiling Water Reactor Independent Spent Fuel Storage Installation Possession-Only License No. DPR-45 NRC Docket Nos. 50-409 and 72-046

Subject:

La Crosse Boiling Water Reactor (LACBWR) Independent Spent Fuel Storage Installation (ISFSI) Annual Radiological Environmental Operating Report, and Changes to the Off-Site Dose Calculation Manual for 2024 In accordance with the Quality Assurance Program Description (QAPD}, Appendix C, Section 1.4.1, "Annual Radiological Environmental Monitoring Report," and Section 1.4.2, "Annual Radioactive Effluent Release Report," this letter submits the 2024 reports for LACBWR ISFSI Possession-Only License No. DPR-45. The reports are required to be submitted prior to March pt per the QAPD reporting requirements. The 2024 Annual Radiological Environmental Operating Report, which includes the Radioactive Effluent Release Report and the Radiological Environmental Monitoring Report, is provided as to this letter. There were no changes or revisions to the LACBWR ISFSI Offsite Dose Calculation Manual during the reporting year 2024.

There are no new regulatory commitments in this submittal. If you have any questions about this submittal, please contact Don Allison at {608} 689-4275.

Respectfully, Martin G. Moe ISFSI Manager MGM:DNA:tco A Touchstone EnergV-Cooperative ~

3200 East Ave. S.

PO Box 817

La Crosse, WI 54602-0817

608-787-1449 ~-787-1321 fax* www.dairvnet.com uaIryland Power cooperative Is an equal opportunity provider and employer.

Martin G. Moe ISFSI Manager Attachments:

DAIRYlAND POWER COOPERATIVE

1. Annual Radiological Environmental Operating Report cc:

Tilda Liu Jack Giessner LACBWR ISFSI Service List {w/o attachments)

A Touchstone Energy., Cooperative ~

3200 East Ave. S.

PO Box 817

La Crosse, WI 54602-0817

608-787-1449 ~-787-1321 fax* www.dairynet.com uaIryIand 1-'ower Cooperative Is an equal opportunity provider and employer.

LACBWR ISFSI SERVICE LIST Yoira Diaz-Sanabria Chief, Storage and Transportation Licensing Branch Division of Fuel Management Office of Nuclear Material Safety and Safeguards John Henkelman, Licensing Engineer Dairyland Power Cooperative La Crosse Boiling Water Reactor Independent Spent Fuel Storage Installation S4601 State Highway 35 Genoa, WI 54632-8846 Mark Paulson, Manager Radiation Protection Section State of Wisconsin Po Box 2659 Madison, WI 53701-2659 Page 1 of 1

DAIRYlAND POWER COOPERATIVE

~TTACHMENT 1 DAIRYLAND POWER COOPERATIVE LA CROSSE BOILING WATER REACTOR (LACBWR)

INDEPENDENT SPENT FUEL STORAGE INSTALLATION (ISFSI)

ANNUAL RADIOACTIVE ENVIRONMENTAL OPERATING REPORT JANUARY - DECEMBER 2024

DAIRYLAND POWER COOPERATIVE LA CROSSE BOILING WATER REACTOR (LACBWR)

INDEPENDENTSPENTFUELSTORAGEINSTALLATION (ISFSI)

License No. DPR-45 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT January - December 2024

EXECUTIVE

SUMMARY

Tables 1 and 2 summarize the quantity of radioactive gaseous and liquid effluents, respectively, for each quarter of 2024. There were no gaseous or liquid releases in 2024. Table 3 summarizes waste shipped offsite for disposal for 2024. There was no waste shipped for disposal in 2024.

Appendices A and B indicate the status of reportable items per the requirements of the Offsite Dose Calculation Manual (ODCM}. There were no reportable items in 2024. Appendix C of this report presents any changes in the ODCM. There were no changes or revisions to the ODCM during 2024.

L~CBWR ISFSI 2023 Annual RER Report Page 1 of 13

Table 1 LACBWR ISFSI Effluent and Waste Disposal Annual Report 2024 Gaseous Effluents - Summation of All Releases Nuclides Released Units 1st 2nd 3rd 4th Quarter Quarter Quarter Quarter A. Fission and Activation Gases Total Release Ci N/A*

N/A*

Average release rate

µCi/s N/A*

N/A*

Percent of regulatory limit N/A*

N/A*

B. Iodines Total Iodines released Ci N/A*

N/A*

Average release rate

µCi/s N/A*

N/A*

Percent of regulatory limit N/A*

N/A*

C. Particulates Particulates Released Ci N/A*

N/A*

Average release rate

µCi/s N/A*

N/A*

Percent of regulatory limit N/A*

N/A*

Gross alpha radioactivity Ci N/A*

N/A*

D. Tritium Total release Ci N/A*

N/A*

Average release rate

µCi/s N/A*

N/A*

Percent of regulatory limit N/A*

N/A*

N/A*= Not Applicable Error N/A*

N/A*

There are no gaseous effluents associated with the LACBWR Independent Spent Fuel Storage Installation (ISFSI)

LACBWR ISFSI 2024 Annual RER Report Page 2 of 13

Table lA LACBWR ISFSI Effluent and Waste Disposal Annual Report 2024 Gaseous Effluents - Ground Level Releases - Batch Mode Nuclides Released Unit 1st 2nd 3rd 4th Total Quarter Quarter Quarter Quarter

1. Fission Gases Krypton-BS Ci N/A*

N/A*

Krypton-85m Ci N/A*

N/A*

Krypton-87 Ci N/A*

N/A*

Krypton-88 Ci N/A*

N/A*

Xenon-133 Ci N/A*

N/A*

Xenon-135 Ci N/A*

N/A*

Xenon-135m Ci N/A*

N/A*

Xenon-138 Ci N/A*

N/A*

Unidentified Ci N/A*

N/A*

Total for period Ci N/A*

N/A*

2. Iodines lodine-131 Ci N/A*

N/A*

lodine-133 Ci N/A*

N/A*

lodine-135 Ci N/A*

N/A*

Total for period Ci N/A*

N/A*

3. Particulates Strontium-89 Ci N/A*

N/A*

Stronti u m-90 Ci N/A*

N/A*

Cesium-134 Ci N/A*

N/A*

Cesium-137 Ci N/A*

N/A*

Cobalt-GO Ci N/A*

N/A*

Barium-Lanthanum-140 Ci N/A*

N/A*

4. Others-Ci N/A*

N/A*

Plutonium-238 Ci N/A*

N/A*

Curium-243,244 Ci N/A*

N/A*

Uranium-234 Ci N/A*

N/A*

Uranium-238 Ci N/A*

N/A*

Thorium-232 Ci N/A*

N/A*

Radium-226 Ci N/A*

N/A*

N/A*= Not Applicable There are no gaseous effluents associated with the LACBWR Independent Spent Fuel Storage Installation (ISFSI)

LACBWR ISFSi 2024 Annual RER Report Page 3 of 13

Table 18 LACBWR ISFSI Effluent and Waste Disposal Annual Report 2024 Gaseous Effluents - Ground Level Releases - Continuous Mode

.Nuclides Released Unit 1st 2nd 3rd 4th Total Quarter Quarter Quarter Quarter

1. Fission Gases Krypton-85 Ci N/A*

N/A*

Krypton-8Sm Ci N/A*

N/A*

Krypton-87 Ci N/A*

N/A*

Krypton-88 Ci N/A*

N/A*

Xenon-133 Ci N/A*

N/A*

Xenon-135 Ci N/A*

N/A*

Xenon-135m Ci N/A*

N/A*

Xenon-138 Ci N/A*

N/A*

Unidentified Ci N/A*

N/A*

Total for period Ci N/A*

N/A*

2. Iodines lodine-131 Ci N/A*

N/A*

lodine-133 Ci N/A*

N/A*

lodine-135 Ci N/A*

N/A*

Total for period Ci N/A*

N/A*

3. Particulates Strontium-89 Ci N/A*

N/A*

Strontium-90 Ci N/A*

N/A*

Cesium-134 Ci N/A*

N/A*

Cesium-137 Ci N/A*

N/A*

Cobalt-GO Ci N/A*

N/A*

Barium-Lanthanum-140 Ci N/A*

N/A*

4. Others-Plutonium-238 Ci N/A*

N/A*

Curium-243,244 Ci N/A*

N/A*

Uranium-234 Ci N/A*

N/A*

Uranium-238 Ci N/A*

N/A*

Thorium-232 Ci N/A*

N/A*

Radium-226 Ci N/A*

N/A*

N/A*= Not Applicable There are no gaseous effluents associated with LACBWR Independent Spent Fuel Storage Installation (ISFSI)

LACBWR ISFSI 2024 Annual RER Report Page 4 of 13

Table lC LACBWR ISFSI Effluent and Waste Disposal Annual Report 2024 Gaseous Effluents - Elevated Releases - Batch Mode Nuclides Released Unit 1st 2nd 3rd 4th Quarter Quarter Quarter Quarter

1. Fission Gases Krypton-BS Ci N/A*

N/A*

Krypton -85m Ci N/A*

N/A*

Krypton -87 Ci N/A*

N/A*

Krypton -88 Ci N/A*

N/A*

Xenon-133 Ci N/A*

N/A*

Xenon-135 Ci N/A*

N/A*

Xenon-135m Ci N/A*

N/A*

Xenon-138 Ci N/A*

N/A*

Unidentified Ci N/A*

N/A*

Total for period Ci N/A*

N/A*

2. Iodines lodine-131 Ci N/A*

N/A*

lodine-133 Ci N/A*

N/A*

lodine-135 Ci N/A*

N/A*

Total for period Ci N/A*

N/A*

3. Particulates Strontium-89 Ci N/A*

N/A*

Strontium-90 Ci N/A*

N/A*

Cesium-134 Ci N/A*

N/A*

Cesium-137 Ci N/A*

N/A*

Cobalt-GO Ci N/A*

N/A*

Barium-La nth an u m-140 Ci N/A*

N/A*

4. Others-Plutonium-238 Ci N/A*

N/A*

Curium-243,244 Ci N/A*

N/A*

Uranium-234 Ci N/A*

N/A*

Uranium-238 Ci N/A*

N/A*

Thorium-232 Ci N/A*

N/A*

Radium-226 Ci N/A*

N/A*

N/A*= Not Applicable There are no gaseous effluents associated with LACBWR Independent Spent Fuel Storage Installation (ISFSI)

Total N/A*

N/A*

LACBWR ISFSI 2024 Annual RER Report Page 5 of 13

Table 1D LACBWR ISFSI Effluent and Waste Disposal Annual Report 2024 Gaseous Effluents - Elevated Releases - Continuous Mode Nuclides Released Unit 1st 2nd 3rd 4th Total Quarter Quarter Quarter Quarter

1. Fission Gases Krypton-BS Ci N/A*

N/A*

Krypton-8Sm Ci N/A*

N/A*

Krypton-87 Ci N/A*

N/A*

Krypton-88 Ci N/A*

N/A*

NIA*

Xenon-133 Ci N/A*

N/A*

Xenon-135 Ci N/A*

N/A*

Xenon-135m Ci N/A*

N/A*

Xenon-138 Ci N/A*

N/A*

Unidentified Ci N/A*

N/A*

Total for period Ci N/A*

N/A*

2. Iodines lodine-131 Ci N/A*

N/A*

lodine-133 Ci N/A*

N/A*

lodine-135 Ci N/A*

N/A*

Total for period Ci N/A*

N/A*

3. Particulates Strontium-89 Ci N/A*

N/A*

Strontium-90 Ci N/A*

N/A*

Cesium-134 Ci N/A*

N/A*

Cesium-137 Ci N/A*

N/A*

Cobalt-GO Ci N/A*

N/A*

Barium-Lanthanum-140 Ci N/A*

N/A*

4. Others-Plutonium-238 Ci N/A*

N/A*

Curium-243,244 Ci N/A*

N/A*

Uranium-234 Ci N/A*

N/A*

Uranium-238 Ci N/A*

N/A*

Thorium-232 Ci N/A*

N/A*

Radium-226 Ci N/A*

N/A*

N/A*= Not Applicable There are no gaseous effluents associated with the LACBWR Independent Spent Fuel Storage Installation (ISFSI)

LACBWR ISFSI 2024 Annual RER Report Page 6 of 13

Table 2 LACBWR ISFSI Effluent and Waste Disposal Annual Report 2024 Liquid Effluents - Summation of All Releases Nuclides Released Units 1st 2nd 3rd Quarter Quarter Quarter A. Fission and Activation Products Total Release (not including Ci N/A*

N/A*

tritium, gases, alpha)

Average diluted concentration

µCi/ml N/A*

N/A*

during period Percent of applicable limit N/A*

N/A*

B. Tritium Total Release Ci N/A*

N/A*

Average diluted concentration

µCi/ml N/A*

N/A*

during period Percent of applicable limit N/A*

N/A*

C. Dissolved and Entrained Gases Total Release Ci N/A*

N/A*

Average diluted concentration

µCi/ml N/A*

N/A*

during period Percent of applicable limit N/A*

N/A*

D. Gross Alpha Radioactivity Total Release Ci N/A*

N/A*

Average diluted concentration

µCi/ml N/A*

N/A*

during period E. Volume of Waste Released Liters N/A*

N/A*

(prior to dilution)

F. Volume of Dilution Water Used Liters N/A*

N/A*

During Period N/A*- Not Applicable 4th Quarter N/A*

N/A*

There are no liquid effluents associated with the LACBWR Independent Spent Fuel Storage Installation (ISFSI)

LACBWR ISFSI 2024 Annual RER Report Page 7 of 13 Error N/A*

N/A*

Table 2A LACBWR ISFSI Effluent and Waste Disposal Annual Report 2024 Liquid Effluents -

Batch Mode Nuclides Released Units 1st 2nd 3rd Quarter Quarter Quarter Strontium-89 Ci N/A*

N/A*

Strontium-90 Ci N/A*

N/A*

Cesium-134 Ci N/A*

N/A*

Cesium-137 Ci N/A*

N/A*

lodine-131 Ci N/A*

N/A*

Cobalt-58 Ci N/A*

N/A*

Cobalt-60 Ci N/A*

N/A*

lron-59 Ci N/A*

N/A*

Zinc-65 Ci N/A*

N/A*

Manganese-54 Ci N/A*

N/A*

Chromium-51 Ci N/A*

N/A*

Zirconium-Niobium-95 Ci N/A*

N/A*

Molybdenum-99 Ci N/A*

N/A*

Technetium-99m Ci N/A*

N/A*

Barium-Lathanium-140 Ci N/A*

N/A*

Cerium-141 Ci N/A*

N/A*

Others-lron-55 Ci N/A*

N/A*

Antimony-125 Ci N/A*

N/A*

Unidentified Ci N/A*

N/A*

Total for period (above)

Ci N/A*

N/A*

Dissolved and Entrained Ci N/A*

N/A*

Gasses Tritium Ci N/A*

N/A*

Gross Alpha Ci N/A*

N/A*

N/A*= Not Applicable 4th Quarter N/A*

N/A*

There are no liquid effluents associated with the LACBWR Independent Spent Fuel Storage Installation (ISFSI)

Totals N/A*

N/A*

LACBWR ISFSI 2024 Annual RER Report Page 8 of 13

Table 2B LACBWR ISFSI Effluent and Waste Disposal Annual Report 2024 Liquid Effluents -

Continuous Mode Nuclides Released Unit 1st 2nd 3rd Quarter Quarter Quarter Strontium-89 Ci N/A*

N/A*

Strontium-90 Ci N/A*

N/A*

Cesium-134 Ci N/A*

N/A*

Cesium-137 Ci N/A*

N/A*

lodine-131 Ci N/A*

N/A*

Cobalt-SB Ci N/A*

N/A*

Cobalt-GO Ci N/A*

N/A*

lron-59 Ci N/A*

N/A*

Zinc-65 Ci N/A*

N/A*

Manganese-54 Ci N/A*

N/A*

Chromium-51 Ci N/A*

N/A*

Zirconium-Niobium-95 Ci N/A*

N/A*

Molybdenum-99 Ci N/A*

N/A*

Technetium-99m Ci N/A*

N/A*

Barium-Lathan i u m-140 Ci N/A*

N/A*

Cerium-141 Ci N/A*

N/A*

Others-lron-55 Ci N/A*

N/A*

Antimony -125 Ci N/A*

N/A*

Unidentified Ci N/A*

N/A*

Total for period (above)

Ci N/A*

N/A*

Dissolved and Entrained Ci N/A*

N/A*

Gasses Tritium Ci N/A*

N/A*

Gross Alpha Ci N/A*

N/A*

N/A*= Not Applicable 4th Quarter N/A*

N/A*

There are no liquid effluents associated with the LACBWR Independent Spent Fuel Storage Installation (ISFSI)

Totals N/A*

N/A*

LACBWR ISFSI 2024 Annual RER Report Page 9 of 13

Table 3 LACBWR ISFSI Effluent and Waste Disposal Annual Report 2024 Low Level Waste Shipments Resins, Filters and Evaporator Bottoms Volume Waste Class Solidifying Agent ft3 m3 A

0 0

B 0

0 C

0 0

All 0

0 Major radionuclides for above data:

Dry Active Waste Volume Waste Class Solidifying Agent ft3 m3 A

0 0

B 0

0 C

0 0

All 0

0 Major radionuclides for above data:

Irradiated Components Volume Waste Class Solidifying Agent ft3 m3 A

0 0

B 0

0 C

0 0

All 0

0 Major radionuclides for above data:

Other Waste Volume Waste Class Solidifying Agent ft3 m3 A

0 0

B 0

0 C

0 0

All 0

0 Major radionuclides for above data:

LACBWR ISFSI 2024 Annual RER Report Curies Shipped Curies 0

0 0

0 Curies Shipped Curies 0

0 0

0 Curies Shipped Curies 0

0 0

0 Curies Shipped Curies 0

0 0

0 Page 10 of 13

Appendix A Radiation Dose Assessment There were no gaseous or liquid effluent releases in 2024 at the LACBWR ISFSI, therefore, no calculations were required to show compliance with 40 CFR 190. An assessment of radiation doses to the most likely exposed member(s} of the public for direct radiation was conducted to show compliance with 10 CFR 72.104.

LACBWR ISFSI 2024 Annual RER Report Page 11 of 13

Appendix B Unplanned Releases There were no unplanned releases of radioactive materials from the LACBWR ISFSI in 2024.

LACBWR ISFSI 2024 Annual RER Report Page 12 of 13

Appendix C Offsite Dose Calculation Manual (ODCM) Changes LACBWR ISFSI procedure RP-20.01, Offsite Dose Calculation Manual (ODCM), there were no changes or revisions in 2024.

LACBWR ISFSI 2024 Annual RER Report Page 13 of 13

DAIRYlAND POWER COOPERATIVE LA CROSSE BOILING WATER REACTOR (LACBWR)

INDEPENDENTSPENTFUELSTORAGEINSTALLATION (ISFSI)

License No. DPR-45 ANNUAL RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT January - December 2024

EXECUTIVE

SUMMARY

The La Crosse Boiling Water Reactor (LACBWR) Independent Spent Fuel Storage Installation (ISFSI) has been in operation since 2012. All fuel has been transferred into dry storage casks and placed at the Independent Spent Fuel Storage Installation. The Radiological Environmental Monitoring Program (REMP) for the LACBWR ISFSI located in Genoa, Wisconsin was continued for the period January through December 2024 in compliance with the LACBWR ISFSI Offsite Dose Calculation Manual (ODCM).

By design, there are no liquid or gaseous effluents associated with the operation of the ISFSI.

Therefore, the ODCM only requires monitoring of direct exposure from the installation. There were no changes made to the Offsite Dose Calculation Manual in 2024.

Thermoluminescent Dosimeter (TLDs) were used to measure direct gamma exposure at ten locations in the vicinity of the ISFSI and Owner Controlled Area fence. Two Environmental Background TLDs are located approximately 0. 72 kilometers away from the ISFSI pad. The results of these measurements showed no significant change in exposure rates and potential doses to members of the public during the monitoring period. The results of the monitoring performed in 2024 showed that operating the LACBWR ISFSI results in only a small fraction of the 40 CFR Part 190 and 10 CFR Part 72.104 direct radiation dose limit of 25 mrem/year to members of the public.

LACBWR ISFSI 2024 Annual REM Report Page 1 of 23

TABLE OF CONTENTS Section Title Page

1.0 INTRODUCTION

5 2.0 GENERAL ISFSI AND SITE INFORMATION 5

3.0 PROGRAM DESIGN 6

3.1 MONITORING ZONES 6

3.2 PATHWAYS MONITORED 6

3.3 DESCRIPTION

OF MONITORING PROGRAM 6

4.0 RADIOLOGICAL DATA

SUMMARY

TABLES 11 5.0 ANALYSIS OF ENVIRONMENTAL RESULTS 22 5.1 SAMPLING PROGRAM DEVIATIONS 22 5.2 DIRECT RADIATION PATHWAY 22

6.0 REFERENCES

23 7.0 ERRATA DATA 23 LACBWR ISFSI 2024 Annual REM Report Page 2 of 23

Table LIST OF TABLES Title Page 3.1 Radiological Environmental Monitoring Program........................................................... 8 3.2 Radiological Environmental Monitoring Locations......................................................... 9 4.1 TLD Measurements by Quarter.................................................................................... 12 4.2 TLD Data Summary....................................................................................................... 13 4.3 Direct Dose from ISFSI Operations................................................................................ 14 LACBWR ISFSI 2024 Annual REM Report Page 3 of 23

Figure LIST OF FIGURES Title Page 3.1 Radiological Environmental Monitoring Locations.................................................. 10 4.1 Annual Dose Trend at Environmental 1 Location..................................................... 16 4.2 Annual Dose Trend at Environmental 6 Location..................................................... 17 4.3 Annual Dose Trend at Environmental 7 Location..................................................... 18 4.4 Annual Dose Trend at Environmental 8 Location..................................................... 19 4.5 Annual Dose Trend at Environmental 9 Location..................................................... 20 4.6 Annual Dose Trend at Environmental 10 Location................................................... 21 LACBWR ISFSI 2024 Annual REM Report Page 4 of 23

1.0 INTRODUCTION

This report summarizes the findings of the Radiological Environmental Monitoring Program (REMP) conducted by Dairyland Power Cooperation (DPC) LACBWR Independent Spent Fuel Storage Installation in Genoa, Wisconsin during the calendar year 2024. It is submitted annually in compliance with the Offsite Dose Calculation Manual (ODCM).

1.0 GENERAL ISFSI AND SITE INFORMATION The La Crosse Boiling Water Reactor (LACBWR) Independent Spent Fuel Storage Installation (ISFSI) is located one mile south of the village of Genoa, Wisconsin, on the east bank of the Mississippi River on the 39-acre site south of the former G-3 plant, about midway between the Mississippi River on the west and Highway 35 on the east and is between the two closed ash landfills of the Genoa site.

In the vicinity of the site, the river valley is deeply cut into highly dissected uplands. From La Crosse 19 miles north to Prairie du Chien approximately 40 miles south, the valley varies between 2 and 4 miles in width. The valley walls rise sharply 500 to 600 feet from river level. There is little or no agricultural use of the river valley floor which consists primarily of marshy land, islands between river channels and extensions of low-lying flood plain cut by ponds, sloughs, and meandering stream channels. Numerous short, steep-sided valleys that have been cut into the uplands by tributary streams intercept the main river valley. Both walls of the main channel are wooded.

The flat upland areas and some of the tributary valleys are cultivated and grazed. The prevailing winds are subjected to the channeling effects of the river valley. This channeling directs almost all the regional scale cross-valley winds into the north-south orientation of the valley. Wind speeds are also lower as a result of vertical decoupling caused by the river valley. In summer, low wind speeds cause air stagnation in the valley during periods of hot humid weather, and in winter some deepening of inversion conditions can cause a stagnant layer of cold air on the valley floor.

There are no major industrial or military facilities of any type in this area; it is principally used for agriculture. There are no facilities or airports using large commercial or military aircraft in the nearby area. There are no industrial facilities of any significant size in the surrounding area. Transportation routes include the twin-track Burlington Northern Sante Fe Railroad line which is west of and parallel to Highway 35. The Mississippi River main channel to the west of the site is used for barge transportation.

LACBWR ISFSI 2024 Annual REM Report Page 5 of 23

3.0 PROGRAM DESIGN The REMP for the LACBWR ISFSI was designed to provide assurance to regulatory agencies and the public that the station's environmental impact is known and within anticipated limits. The direct dose limit for members of the public from operation of the ISFSI is less than 25 mrem per year (References 3 and 4).

The detailed sampling requirements of the REMP are given in the ODCM. The sampling requirements specified in the ODCM are summarized in Table 3.1 of this report. Details of the monitored locations are shown in Table 3.2, as well as Figures 3.1 of this report.

3.1 Monitoring Zones The REMP is designed to allow comparison of levels of radioactivity in samples from the area possibly influenced by the ISFSI to levels found in areas not influenced by the ISFSI. The first area is called "Environmental TLDs". The second area is called "Environmental Background TLDs". The distinction between the two is based on relative direction from the installation and distance. Analysis of survey data from the two zones aids in determining if there is a significant difference between the two areas. It can also help in differentiating between radioactivity or radiation due to releases and that due to other fluctuations in the environment, such as seasonal variations in the natural background.

Environmental TLD locations 1, 6, 7, 8, 9 and 10 are used to assess ambient dose conditions to the public and are located on the Owner Controlled Area (OCA) fence. Environmental TLD locations 2 through 5 are located on the Protected Area (PA) fence in order to monitor and trend dose for information only from the ISFSI Pad.

3.2 Pathways Monitored Based on the design of the ISFSI, the only exposure pathway is direct radiation exposure, monitored by the REMP. This pathway is monitored by the collective placement of thermoluminescent dosimeters (TLDs) which are described in more detail in the following section.

3.3 Descrip.tion of Monitoring Program 3.3.1 Direct Radiation Direct gamma radiation exposure was continuously monitored during 2024 with the use of thermoluminescent dosimeters (TLDs). At each monitoring location, these TLDs are sealed in plastic bags and attached to an object such as a fence. The TLDs are posted and retrieved on a quarterly basis.

LACBWR ISFSI 2024 Annual REM Report Page 6 of 23

All TLDs are provided and processed by a National Voluntary Laboratory Accreditation Program (NVLAP) certified vendor. The TLDs are placed at various locations around the ISFSI. Table 3.2 lists the Environmental TLD location numbers, distances, and direction of the TLDs from the ISFSI.

3.3.2 Special Monitoring Special samples can be taken that are not required in the ODCM. No special samples were collected in 2024.

LACBWR ISFSI 2024 Annual REM Report Page 7 of 23

Table 3.1 Radiological Environmental Monitoring Program Exposure Collection Analysis Pathway Analysis Analysis and/or Number of Sample Routine Collection Sample Media Locations Sampling Mode Frequency Type Frequency Direct Total Locations: 12 (6 Continuous Quarterly Gamma Quarterly Radiation around perimeter of dose (TLD) the OCA, 4 around the perimeter of the PA fence and 2 offsite control locations)

LACBWR ISFSI 2024 Annual REO Report Page 8 of 23

Table 3.2 Radiological Environmental Monitoring Locations Environmental Station Description Distance Direction TLD Location #

From ISFSI (feet)

From ISFSI 1

ISFSI Administrative Building 373 w

2*

ISFSI Protected Area 25 NE 3*

ISFSI Protected Area so NW 4*

ISFSI Protected Area 70 SW 5*

ISFSI Protected Area 60 SE 6

ISFSI Owner Control Fence 573 N

7 ISFSI Owner Control Fence 361 w

8 ISFSI Owner Control Fence 516 E

9 ISFSI Owner Control Fence 483 NE 10 ISFSI Owner Control Fence 798 w

11 Background Dosimeter #1 2360 NE 12 Background Dosimeter #2 2365 NE

TLD used for Information Only LACBWR ISFSI 2024 Annual REM Report Page 9 of 23

Figure 3.1 Radiological Environmental Monitoring Locations I

JI LACBWR ISFSI 2024 Annual REM Report

-'"'\\

y-

=::----

0=-,.__--,-,-_ _,

D

..___-==

tt tJ

!!!!!l......

-..... :** . J Page 10 of 23 VEHICLE BARRIER SYSTEM CONTROLLED AREA BOUNDARY FENCE CLOSED ASH DISPOSAL AREA ISFSI CONTROLLED AREA BOUNDARY FENCE 0 50100 200 300 500 SCALE (FEET)

N 1.--

0

JI -

,u ~

I ---

,{

4.0 RADIOLOGICAL DATA

SUMMARY

TABLES This section summarizes the analytical results of the environmental samples, which were collected during the monitoring period.

Data from direct radiation measurements made by TLDs are presented in Table 4.1.

The summarized TLD measurements, shown in Table 4.2, are presented in a format similar to that prescribed in the NRCs Radiological Assessment Branch Technical Position on Environmental Monitoring (Reference 1).

Table 4.3 presents the estimated direct dose from ISFSI operations as determined by TLD data shown in Table 4.1.

LACBWR ISFSI 2024 Annual REM Report Page 11 of 23

Table 4.1 TLD Measurements by Quarter (mrem)

Location Direction 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Number 1

w 2

3 2

2 2

NE 24 27 19 22 3

NW 74 74 77 79 4

SW 17 14 17 15 5

SE 28 25 28 25 6

N 2

2 2

2 7

w 3

1 0

1 8

E 4

3 3

3 9

NE 3

3 3

2 10 w

4 5

6 4

11 NE 16 18 19 19 12 NE 18 16 21 19 LACBWR ISFSI 2024 Annual REM Report Page 12 of 23

Table 4.2 TLD Data Summary (mrem)

OCA Fence TLDs Env BkgTLDs OCA Fence TLD with Highest Mean Mean Mean Location Mean Range Range Number Range No. Measurements +

No. Measurements +

No. Measurements+

2.6 18.3 10 4.8 0-6 15-21 4-6 24 8

4

used OCA Fence Environmental TLD Locations Only {Location Numbers 1, 6, 7, 8, 9 and 10)

+Each "measurement" is based on quarterly readings.

LACBWR ISFSI 2024 Annual REM Report Page 13 of 23

Table 4.3 Direct Dose from ISFSI Operation (mrem) 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Net Net Net Location TLD Calculated TLD Calculated TLD Calculated NetTLD Calculated Annual Number Results Dose Results Dose Results Dose Results Dose Dose 1

2 0.02 3

0.02 2

0.02 0.07 6

2 0.02 2

0.02 2

0.02 0.06 7

3 0.02 1

0.01 0

0.00 1

0.01 0.04 8

4 0.03 3

0.02 3

0.02 0.10 9

3 0.02 3

0.02 3

0.02 2

0.02 0.08 10 4

0.03 5

0.04 5

0.05 4

0.03 0.15 Maximum Dose =>

0.15 Note:

Doses based on a 67-hour occupancy in unrestricted area for the year.

LACBWR ISFSI 2024 Annual REM Report Page 14 of 23

Radiological Environmental Monitoring Program Trending A series of graphs of REMP TLD data have been developed and are provided for trending purposes.

The trending is developed for each of the Environmental TLD locations based on the annual historical doses. The trending is provided for the "real members of the public" based on the guidance provided in the ODCM. The analysis of the trends and associated data shows very small annual doses with minor fluctuations in the data. In this report, the Environmental TLD results have been summarized and the annual doses, calculated for "real members of the public" based upon guidance in the ODCM, have been plotted for trending.

LACBWR ISFSI 2024 Annual REM Report Page 15 of 23

Figure 4.1 Annual Dose Trend at Environmental 1 Location Environmental 1 30.00 25.00.,_ ___

1o... 20.00

~ 15.00 a:

E 10.00 5.00 0.13 0.03 0.08 0.02 0.02 0.07 0.00 --------------~---------------

2019 Location Environmental 1 2020 2021 Year 2022

~

Environmental 1 ~

Reg Limit Annual Doses (mrem/yr) 2019 2020 2021 2022 0.13 0.03 0.08 0.02 LACBWR ISFSI 2024 Annual REM Report 2023 2024 2023 2024 0.02 0.07 Page 16 of 23

Figure 4.2 Annual Dose Trend at Environmental 6 Location Environmental 6 30.00 25.00 ____,... ___,... ___,... ________ __

L. 20.00

~ 15.00 a::

E 10.00 5.00 0.11 0.01 0.05 0.08 0.02 0.06 0.00 -------------------------*

2019 2020 2021 Year 2022

...,_Environmental 6

...,_Reg Limit 2023 Annual Doses (mrem/yr)

Location 2019 2020 2021 2022 2023 Environmental 6 0.11 0.01 0.05 0.08 0.02 LACBWR ISFSI 2024 Annual REM Report 2024 2024 0.06 Page 17 of 23

Figure 4.3 Annual Dose Trend at Environmental 7 Location Environmental 7 30.00 25.00 e----------114..,_ _____...,._ __ _,,.~---

.._ 20.00

~ 15.00 a:::

E 10.00 5.00 0.13 0.03 0.08 0.04 0.02 0.04 0.00 _________...,.. ______________...,.. __

2019 Location Environmental 7 2020 2021 Year 2022

~

Environmental 7

~

Reg Limit Annual Doses (mrem/yr) 2019 2020 2021 2022 0.13 0.03 0.08 0.04 LACBWR ISFSI 2024 Annual REM Report 2023 2024 2023 2024 0.02 0.04 Page 18 of 23

Figure 4.4 Annual Dose Trend at Environmental 8 Location Environmental 8 30.00 25.00 _____________.....,. _____________ _

.._ 20.00

~

~ 15.00 a::

E 10.00 5.00 0.15 0.06 0.10 0.06 0.07 0.10 0.00 ------------------------------

2019 2020 2021 Year 2022

~

Environmental 8

~

Reg Limit Annual Doses (mrem/yr)

Location 2019 2020 2021 2022 Environmental 8 0.15 0.06 0.10 0.06 LACBWR ISFSI 2024 Annual REM Report 2023 2024 2023 2024 0.07 0.10 Page 19 of 23

Figure 4.5 Annual Dose Trend at Environmental 9 Location Environmental 9 30.00 25.00.,_ ___.,_ ___

,.__ 20.00 E

a, 15.00 a:::

E 10.00 5.00 0.15 0.03 0.03 0.06 0.05 0.08 0.00 _____.,_ ___,._ ___,._ ___..,. ___

2019 Location Environmental 9 2020 2021 Year 2022

~

Environmental 9

~

Reg Limit Annual Doses (mrem/yr) 2019 2020 2021 2022 0.15 0.03 0.03 0.06 LACBWR ISFSI 2024 Annual REM Report 2023 2024 2023 2024 0.05 0.08 Page 20 of 23

Figure 4.6 Annual Dose Trend at Environmental 10 Location Environmental 10 30.00 25.00 __________....,..,_ __

1-20.00

~ 15.00 c::

E 10.00 5.00 0.17 0.10 0.17 0.10 0.11 0.15 0.00 _________....,....,_ __

2019 Location Environmental 10 2020 2021 Year 2022

~

Environmental 10

~

Reg Limit Annual Doses (mrem/yr) 2019 2020 2021 2022 0.17 0.10 0.17 0.10 LACBWR ISFSI 2024 Annual REM Report 2023 2024 2023 2024 0.11 0.15 Page 21 of 23

5.0 ANALYSIS OF ENVIRONMENTAL RESULTS 5.1 Sampling Program Deviations.

A sampling program deviation is defined as samples that are unobtainable due to hazardous conditions or to malfunction of sampling equipment. Such deviations do not compromise the program's effectiveness and in fact are considered insignificant with respect to what is normally anticipated for this Radiological Environmental Monitoring Program.

There were no deviations during the monitoring year 2024.

5.2 Direct Radiation Pathway 5.2.1 Annual Dose Trends Direct radiation is continuously measured at 10 Environmental locations surrounding the LACBWR ISFSI, 6 are located on the Owner Controlled Area {OCA) fence, monitoring dose to the public and 4 located on the Protected Area {PA) are used for trending purposes only. There are also, 2 Environmental Background locations using thermoluminescent dosimeters {TLDs). These dosimeters are collected on a quarterly basis for readout at the NVLAP certified dosimetry services vendor.

Review of the data in Figures 4.1 through 4.6 shows no significant difference in annual doses over time at the indicator locations and their relation to the 25 mrem/yr limit.

5.2.2 Direct Doses from ISFSI Operations A dose estimate is the potential dose to any real member of the public that could use portions of the site or be present adjacent to the site for recreational activities throughout the year. Direct exposure above background can be estimated by subtracting the average TLD value of the Environmental Background TLDs from the Environmental TLD location measurements. The 2024 dose estimate assumes a total of 67 hours7.75463e-4 days <br />0.0186 hours <br />1.107804e-4 weeks <br />2.54935e-5 months <br /> maximum occupancy for the dose calculation. The most likely location for exposure to a member of the public from the ISFSI at the Public Boat Launch at approximately 840 feet from ISFSI pad, near Environmental 10 TLD location.

Table 4.3 presents the results of the dose calculations. The highest calculated dose is at the Environmental 10 TLD location. The maximum calculated annual dose at those locations is 0.15 mrem. This value is only 0.6 percent of the 25 mrem per year limit.

LACBWR ISFSI 2024 Annual REM Report Page 22 of 23

6.0 REFERENCES

1. USNRC Radiological Assessment Branch Technical Position, "An Acceptable Radiological Environmental Monitoring Program," Revision 1, November 1979.

2. LACBWR ISFSI Radiation Protection Procedure, RP-20.01, Offsite Dose Calculation Manual, Issue 01.

3. 40 CFR Part 190, "Environmental Radiation Protection Standards for Nuclear Power Operation".

4. 10 CFR Part 72.104, "Criteria for Radioactive Materials in Effluents and Direct Radiation from an ISFSI or MRS".

7.0 ERRATA DATA No Errata Data to report.

LACBWR ISFSI 2024 Annual REM Report Page 23 of 23

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