ML25132A067

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2023 Annual Radioactive Effluent Release Report (Arrer Errata), January 1 - December 31, 2023
ML25132A067
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 05/10/2025
From:
Northern States Power Company, Minnesota, Xcel Energy
To:
Office of Nuclear Reactor Regulation
Shared Package
ML25132A064 List:
References
L-MT-25-018
Download: ML25132A067 (1)
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Text

ENCLOSURE 2 2023 ARRER Errata JANUARY 1 - DECEMBER 31, 2023 3 Pages Follow

Monticello Nuclear Generating Plant Page 8 2023 Annual Radioactive Effluent Release Report OFFSITE DOSE DUE TO GASEOUS RELEASES Critical Receptor dose results below were calculated using the 2023 effluent source term from Table 11 and Table 12. The Critical Receptor doses include dose from C-14 released between May 1 and September 30, in accordance with the methodology in the MNGP ODCM; this is because only C-14 released during the growing season will be incorporated into food products that contribute to the calculated dose for the Ingestion pathways. Dose due to noble gases released from the Plant Stack and Reactor Building Vent (RBV) release points have been determined for the SSE site boundary location.

The calculated quarterly and annual doses remain a small percentage of the Guidelines provided in Appendix I to 10 CFR 50.

TABLE 2: CRITICAL RECEPTOR ORGAN DOSE Max Organ Period Dose*

10 CFR 50, Appendix I Design Objective

% of Guideline Thyroid Thyroid Bone Thyroid Q1 Q2 Q3 Q4 0.0137 mrem 0.00967 mrem 0.0173 mrem 0.00449 mrem 7.5 mrem/quarter 0.18%

0.13%

0.23%

0.06%

Thyroid Annual 0.0328 mrem 15 mrem/year 0.22%

TABLE 3: AIR DOSE DUE TO NOBLE GASES AT THE MAXIMUM SITE BOUNDARY LOCATION Exposure Type Period Exposure*

10 CFR 50, Appendix I Design Objective

% of Guideline Gamma Air Dose Q1 Q2 Q3 Q4 0.000612 mrad 0.000260 mrad 0.000585 mrad 0.000403 mrad 5 mrad/quarter 0.01%

0.01%

0.01%

0.01%

Annual 0.00186 mrad 10 mrad/year 0.02%

Beta Air Dose Q1 Q2 Q3 Q4 0.000154 mrad 0.0000624 mrad 0.000215 mrad 0.000215 mrad 10 mrad/quarter 0.0015%

0.0006%

0.002%

0.002%

Annual 0.000646 mrad 20 mrad/year 0.006%

  • Includes dose due to Noble Gases only.

Monticello Nuclear Generating Plant Page 25 Attachment A: 2023 ARERR Release Summary Tables Table 11: Gaseous Effluents - Summation of All Releases (RG-1.21 Table 1A)

Est. Total Error, Qtr 4 Qtr 3 Qtr 2 Qtr 1 Units Type of Effluent A. Fission & Activation Gases

1. Total Release Curies 2.65E+01 1.29E+01 1.67E+01 1.57E+01 5.00E+01
2. Average Release Rate for Period

µCi/sec 3.40E+00 1.64E+00 2.10E+00 1.97E+00

3. Percent of Applicable Limit 1.19E-02 5.15E-03 1.12E-02 7.84E-03 B. Iodines
1. Total Iodine-131 Curies 1.10E-03 3.98E-04 5.50E-04 4.04E-04 3.20E+01
2. Average Release Rate for Period

µCi/sec 1.41E-04 5.06E-05 6.92E-05 5.08E-05

3. Percent of Applicable Limit 1.10E-01 3.98E-02 5.50E-02 4.04E-02 C. Particulates
1. Total Particulates (Half-lives > 8 days)

Curies 1.45E-04 2.93E-04 2.07E-04 2.22E-04 4.00E+01

2. Average Release Rate for Period

µCi/sec 1.87E-05 3.72E-05 2.60E-05 2.79E-05

3. Percent of Applicable Limit 4.95E-03 1.06E-02 5.89E-03 8.34E-03
4. Gross Alpha Activity Curies 3.64E-07 5.53E-07 6.23E-07 3.83E-07 5.00E+01 D. Tritium
1. Total Release Curies 4.91E+00 3.78E+00 4.20E+00 4.35E+00 3.30E+01
2. Average Release Rate for Period

µCi/sec 6.31E-01 4.80E-01 5.28E-01 5.50E-01

3. Percent of Applicable Limit 9.72E-03 7.32E-03 1.15E-02 1.65E-02 E. Carbon-14
1. Total Release Curies 2.01E+00 1.21E+00 1.81E+00 1.73E+00 N/A

Monticello Nuclear Generating Plant Page 27 Attachment A: 2023 ARERR Release Summary Tables Continuous Mode Batch Mode Nuclides Released Units Qtr 1 Qtr 2 Qtr 3 Qtr 4 Qtr 1 Qtr 2 Qtr 3 Qtr 4

1. Fission and Activation Gases Xe-133 Curies 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 2.31E-04 Xe-135 Curies 3.18E-01 1.83E-01 6.69E-01 8.73E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Xe-135m Curies 5.73E-01 0.00E+00 6.98E-01 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Curies 8.91E-01 1.83E-01 1.37E+00 8.73E-01 0.00E+00 0.00E+00 0.00E+00 2.31E-04 Total for Period
2. Iodines I-131 Curies 7.16E-04 1.39E-04 9.56E-05 6.80E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 I-133 Curies 6.36E-03 5.65E-04 7.94E-04 4.93E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 I-135 Curies 1.66E-02 0.00E+00 0.00E+00 5.04E-04 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Curies 2.36E-02 7.04E-04 8.90E-04 1.07E-03 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Total for Period
3. Particulates Ag-110m Curies 0.00E+00 0.00E+00 9.42E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Ba-140 Curies 5.36E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-58 Curies 1.43E-06 2.34E-05 2.10E-05 3.97E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Co-60 Curies 1.63E-05 1.21E-04 4.42E-05 6.89E-05 0.00E+00 0.00E+00 0.00E+00 2.68E-07 Cr-51 Curies 0.00E+00 2.61E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Cs-137 Curies 3.15E-05 4.80E-06 3.89E-06 2.85E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Mn-54 Curies 2.83E-06 1.75E-05 1.86E-06 2.09E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Os-191 Curies 0.00E+00 3.02E-06 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Sb-124 Curies 0.00E+00 1.09E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Sr-89 Curies 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Sr-90 Curies 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Zn-65 Curies 3.35E-06 1.92E-05 3.95E-06 3.22E-05 0.00E+00 0.00E+00 0.00E+00 0.00E+00 Curies 1.09E-04 2.26E-04 1.69E-04 1.90E-04 0.00E+00 0.00E+00 0.00E+00 2.68E-07 Total for Period
4. Tritium Curies 4.43E+00 3.07E+00 3.25E+00 3.26E+00 0.00E+00 0.00E+00 0.00E+00 1.99E-04 H-3
5. Carbon-14 Curies 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 0.00E+00 C-14 Table 13: Gaseous Effluents - Reactor Building Vent & Water Storage Pond Releases (RG-1.21 Table 1C)
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