ML25246A660
| ML25246A660 | |
| Person / Time | |
|---|---|
| Site: | BWX Technologies |
| Issue date: | 08/27/2025 |
| From: | Freudenberger R BWXT, BWXT |
| To: | Document Control Desk, Office of Nuclear Material Safety and Safeguards |
| References | |
| 25-049 | |
| Download: ML25246A660 (1) | |
Text
BWX Techno logies, Inc.
August 27, 2025 25-049 ATTN: Document Control Desk Director, Office of Nuclear Material Safety & Safeguards U. S. Nuclear Regulatory Commission Washington, DC 20555-0001
Reference:
License No. SNM-42, Docket 70-27
Subject:
Semi-Annual Effluent Monitoring Report
Dear Sir or Madam:
The Semi-Annual Effluent Report for the BWXT Nuclear Operations Group, Inc., Lynchburg (NOG-L) facility covering the first semi-annual effluent monitoring period for 2025 is enclosed.
This report is being submitted in accordance with the requirements of 10 CFR 20.1302 and 10 CFR 70.59.
If you have questions or require additional information, please contact Daniel Ashworth, Manager of Licensing and Safety Analysis, at dlashworth@bwxt.com or 434-522-5472.
Sincerely,
~~r Richard J. Freudenberger Manager, Environment, Safety, Health & Safeguards BWXT Nuclear Operations Group, Inc. - Lynchburg Enclosure cc:
NRC, Region II NRC, Resident Inspector BWXT Nuclear Operations Group, Inc.
PO Box 785 Lynchburg, VA 24505 USA t: +1.434.522.6000 www.bwxt.com People Strong INNDVATIDN DRIVEN >
BWXT Nuclear Operations Group, Inc P.O. Box 785 Lynchburg, VA 24505 USA t: + 1.434.522.6000 www.bwxt.com ENCLOSURE 7 pages People Strong INNOVATION DRIVEN >
SAFETY RP-08-017, Form 2 Radiation BWXT SEMI-ANNUAL EFFLUENT MONITORING Rev. 11 Protection NOG-L REPORT-STACK EFFLUENT DATA Date: 01/01/18 Page 1 of6 Reporting Period: 1 January, 2025 to 30 June, 2025 Stack:
Waste Management Averai:ie Flow Rate:
1.26 m3/s Concentration Error Estimate LLD Quantity Released Dose Radionuclide (10-12 uCi/ml)
(+/-10-12 µCi/ml)
(10-12 uCi/ml)
(uCi) mRem U-234 (Y)
<0.01
<0.01
<0.01 0.01 2.0 x10--4 *
- Dose includes Stacks for: Waste Management Center, 2A Stack, 2A Production Support, 1A Maintenance, & 3A Pharmacy Stack:
2A Stack Averaqe Flow Rate:
1.02 m3/s Concentration Error Estimate LLD Quantity Released Dose Radionuclide (10-12 uCi/ml)
(+/-10-12 uCi/ml)
(10-12 uCi/ml)
(uCi) mRem U-234 (Y) 0.01 0.01 0.03 0.21 2.0 x104 *
- Dose includes Stacks for: Waste Management Center, 2A Stack, 2A Production Support, 1A Maintenance, & 3A Pharmacy Stack:
2A Production Support Averai:ie Flow Rate:
0.95 m3/s Radionuclide Concentration (10-12 uCi/ml)
Error Estimate
(+1-10-12 uCi/ml)
LLD (10-12 uCi/ml)
Quantity Released
<uCi)
Dose mRem U-234 (Y)
<0.01
<0.01
<0.01 0.01 2.0 x104 *
- Dose includes Stacks for: Waste Management Center, 2A Stack, 2A Production Support, 1A Maintenance, & 3A Pharmacy Stack:
1A Maintenance Averaqe Flow Rate:
4.73 m3/s Radionuclide U-234 (Y)
Concentration (10-12 uCi/ml)
<0.01 Error Estimate
(+t-10-12 uCi/ml)
<0.01 LLD (10-12 uCi/ml)
<0.01 Quantity Released (uCi) 0.09 Dose mRem 2.0 x104 *
- Dose includes Stacks for: Waste Management Center, 2A Stack, 2A Production Support, 1A Maintenance, & 3A Pharmacy Stack:
3A Pharmacy Averai:ie Flow Rate:
1.27 m3/s Radionuclide Concentration (10-12 uCi/ml)
Error Estimate
(+t-10-12 uCi/ml)
LLD (10-12 uCi/ml)
Quantity Released
<uCi)
Dose mRem U-234 (Y)
<0.01
<0.01 0.01 0.06 2.0 x104 *
- Dose includes Stacks for: Waste Management Center, 2A Stack, 2A Production Support, 1A Maintenance, & 3A Pharmacy
SAFETY Radiation BWXT SEMI-ANNUAL EFFLUENT MONITORING Protection NOG-L REPORT-STACK EFFLUENT DATA Reporting Period: 1 January, 2025 to 30 June, 2025 Stack:
Bay 17 Avera!'.)e Flow Rate:
0.75 m3/s Concentration Error Estimate LLD Radionuclide (10-12 uCi/ml)
(+t-10-12 uCi/ml)
(10-12 uCi/ml)
U-234 (Y)
<0.01
<0.01
<0.01
- Dose includes Stacks for: Bay 17, Met Lab, 3A Stack, U-Mo Bay 15 & RTR Stack:
Met Lab Averaqe Flow Rate:
Radionuclide 4.70 m3/s Concentration (10-12 uCi/ml)
Error Estimate
(+/-10-12 uCi/ml)
LLD (10-12 uCi/ml)
U-234 (Y) 0.01
<0.01
<0.01
- Dose includes Stacks for: Bay 17, Met Lab, 3A Stack, U-Mo Bay 15 & RTR Stack:
3A Stack Avera!'.)e Flow Rate:
1.08 m3/s Concentration Error Estimate LLD Radionuclide (10-12 uCi/ml)
(+/-10-12 uCi/ml)
(10-12 uCi/ml)
U-234 (Y) 0.02 0.01 0.03
- Dose includes Stacks for: Bay 17, Met Lab, 3A Stack, U-Mo Bay 15 & RTR Stack:
U-Mo Bay 15 Averaqe Flow Rate:
4.85 m3/s Concentration Error Estimate LLD Radionuclide (10-12 uCi/ml)
(+/-10-12 uCi/ml)
(10-12 uCi/ml)
U-234 (Y)
<0.01
<0.01
<0.01
- Dose includes Stacks for: Bay 17, Met Lab, 3A Stack, U-Mo Bay 15 & RTR Stack:
RTR Average Flow Rate:
6.60 m3/s Concentration Error Estimate LLD Radionuclide (10-12 uCi/ml)
(+/-10-12 uCi/ml)
(10-12 uCi/ml)
U-234 (Y) 0.01
<0.01
<0.01
- Dose includes Stacks for: Bay 17, Met Lab, 3A Stack, U-Mo Bay 15 & RTR Quantity Released (uCD 0.02 Quantity Released (uCi) 0.47 Quantity Released (uCi) 0.39 Quantity Released (uCi) 0.06 Quantity Released (uCi) 0.52 RP-08-017, Form 2 Rev. 11 Date: 01/01/18 Page 2 of 6 Dose mRem 7.6 x104
- Dose mRem 7.6 x104
- Dose mRem 7.6 x104
- Dose mRem 7.6 x104
- Dose mRem 7.6 x104
- SAFETY Radiation BWXT SEMI-ANNUAL EFFLUENT MONITORING Protection NOG-L REPORT-STACK EFFLUENT DATA Reporting Period: 1 January, 2025 to 30 June, 2025 Stack:
SFF Averaoe Flow Rate:
8.39 m3/s Concentration Error Estimate LLD Quantity Released Radionuclide (10-12 µCi/ml)
(+/-10-12 µCi/ml)
(10-12 µCi/ml)
(µCi)
U-234 (Y) 0.01
<0.01 0.01 0.75
- Dose includes Stacks for: SFF, 13A-15A Dry Stacks, Chem Lab Scrubber, 14A Maintenance, & Recovery Stack:
13A-15A Dry Stacks Average Flow Rate:
14.08 m3/s Radionuclide U-234 (Y)
Concentration (10-12 µCi/ml) 0.01 Error Estimate
(+/-10-12 µCi/ml) 0.01 LLD (10-12 µCi/ml) 0.02 Quantity Released
(µCi) 1.70
- Dose includes Stacks for: SFF, 13A-15A Dry Stacks, Chem Lab Scrubber, 14A Maintenance, & Recovery Stack:
Chem Lab Scrubber Averaoe Flow Rate:
10.60 m3/s Radionuclide U-234 (Y)
Concentration (10-12 µCi/ml) 0.02 Error Estimate
(+/-10-12 µCi/ml)
<0.01 LLD (10-12 µCi/ml)
<0.01 Quantity Released (uCi) 3.76
- Dose includes Stacks for: SFF, 13A-15A Dry Stacks, Chem Lab Scrubber, 14A Maintenance, & Recovery Stack:
14A Maintenance Averaoe Flow Rate:
2.78 m3/s Concentration Error Estimate LLD Quantity Released Radionuclide (10-12 uCi/ml)
(+/-10-12 uCi/ml)
(10-12 uCi/ml)
(uCi)
U-234 (Y)
<0.01 0.01 0.03 0.21
- Dose includes Stacks for: SFF, 13A-15A Dry Stacks, Chem Lab Scrubber, 14A Maintenance, & Recovery Stack:
Recovery Average Flow Rate:
9.86 m3/s Concentration Error Estimate LLD Quantity Released Radionuclide (10-12 µCi/ml)
(+1-10-12 uCi/ml)
(10-12 uCi/ml)
(uCi)
U-234 (D) 0.19 0.02 0.11 28.88
- Dose includes Stacks for: SFF, 13A-15A Dry Stacks, Chem Lab Scrubber, 14A Maintenance, & Recovery RP-08-017, Form 2 Rev. 11 Date: 01/01/18 Page 3 of6 Dose mRem 4.0 x10-3
- Dose mRem Dose mRem 4.0 x10-3*
Dose mRem 4.0 x10-3
- Dose mRem 4.0 x10-3*
SAFETY RP-08-017, Form 2 Radiation BWXT SEMI-ANNUAL EFFLUENT MONITORING Rev. 11 Protection NOG-L REPORT-STACK EFFLUENT DATA Date: 01/01/18 Page 4 of 6 Reporting Period: 1 January, 2025 to 30 June, 2025 Stack:
Laundr:y AveraQe Flow Rate:
3.11 m3/s Concentration Error Estimate LLD Quantity Released Dose Radionuclide (10-12 µCi/ml)
( +!-10-12 uCi/ml)
(10-12 µCi/ml)
(µCi) mRem U-234 (Y) 0.03 0.01 0.02 1.37 2.9 x10-2 *
- Dose of 2.9 x10-2 includes all activity from: Laundry, Compactor, Retention Tanks, WT Scrubber, & Decontamination Stack:
ComQactor Averaqe Flow Rate:
1.71 m3/s Concentration Error Estimate LLD Quantity Released Dose Radionuclide (10-12 uCi/ml)
(+/-10-12 uCi/ml)
(10-12 uCi/ml)
(uCi) mRem U-234 (Y)
<0.01
<0.01
<0.01 0.07 2.9 x10-2 *
- Dose of 2.9 x10-2 includes all activity from: Laundry, Compactor, Retention Tanks, WT Scrubber, & Decontamination Stack:
Retention Tanks AveraQe Flow Rate:
0.61 m3/s Radionuclide U-234 (Y)
Concentration (10-12 uCi/ml)
<0.01 Error Estimate
( +/-10-12 uCi/ml)
<0.01 LLD (10-12 uCi/ml)
<0.01 Quantity Released (uCi) 0.02 Dose mRem 2.9 x10-2 *
- Dose of 2.9 x 10-2 includes all activity from: Laundry, Compactor, Retention Tanks, WT Scrubber, & Decontamination Stack:
WT Scrubber Average Flow Rate:
1.20 m3/s Concentration Error Estimate LLD Quantity Released Dose Radionuclide (10-12 µCi/ml)
{+/-10-12 µCi/ml)
(10-12 µCi/ml)
(µCi) mRem U-234 (Y) 2.21 0.05 0.04 41.41 2.9 x10-2
- Th-228 (Y)
Note 2 Note 2 Note 2 0.19 2.9 x10-2
- Th-230 (W)
Note 2 Note 2 Note 2 1.37 2.9 x10-2
- Np-237 (W)
Note 2 Note 2 Note 2 0.04 2.9 x10-2
- Am-241 (W)
Note 2 Note 2 Note 2 0.02 2.9 x10-2 *
- Dose of 2.9 x 10-2 includes all activity from: Laundry, Compactor, Retention Tanks, WT Scrubber, & Decontamination Stack:
Decontamination Averaqe Flow Rate:
2.34 m3/s Radionuclide Concentration (10-12 uCi/ml)
Error Estimate
(+t-10-12 µCi/ml)
LLD (10-12 µCi/ml)
Quantity Released
(µCi)
Dose mRem U-234 (Y)
<0.01
<0.01
<0.01 0.14 2.9 x10-2 *
- Dose of 2.9 x 10-2 includes all activity from: Laundry, Compactor, Retention Tanks, WT Scrubber, & Decontamination
SAFETY Radiation Protection BWXT NOG-L SEMI-ANNUAL EFFLUENT MONITORING REPORT-STACK EFFLUENT DATA Reporting Period: 1 January, 2025 to 30 June, 2025 Stack:
L TC 50 Meter Stack Avera e Flow Rate:
0.095 m31s Concentration Error Estimate LLD Quantity Released Radionuclide 10-12 Ci/ml
+/-10-12 Ci/ml 10-12 Ci/ml Ci U-238 (Y)
<0.01
<0.01
<0.01 9.8x10-s Th-228 (Y)
<0.01
<0.01
<0.01 5.25x10-5 Th-230 (W)
<0.01
<0.01
<0.01 5.33x10-5 Th-232 (W)
<0.01
<0.01
<0.01 2.10x10-5 Am-241 (W)
<0.01
<0.01
<0.01 2.50x10-5 Np-237 (W)
<0.01
<0.01
<0.01 4.90x10-5 Pu-239/240 (W)
<0.01
<0.01
<0.01 8.35x 10-6 H-3 (V) 545 0.01 0.415 1.53x105
- Dose of 4.5 x10-7 mrem was calculated with COMPLY using all nuclides listed for the 50 Meter Stack.
Stack:
L TC AC Lab Stack Avera e Flow Rate:
1.53 m3/s Radionuclide H-3 (V)
Concentration 10-12 Ci/ml 1.14 Stack:
L TC RCL Stack Avera e Flow Rate:
1.55 m3/s Concentration Radionuclide 10-12 Ci/ml U-234 (Y) 6.02 H-3 (V) 1.35 Error Estimate
+/-10-12 Ci/ml
<0.01 Error Estimate
+1-10-12 Ci/ml 1.57
<0.01 LLD 10-12 Ci/ml 1.94 LLD 10-12 Ci/ml 0.01 1.94 Quantity Released Ci 27.2 Quantity Released Ci 0.09 31.6
- Dose of 5.9 x10-5 mrem was calculated with COMPLY using both nuclides listed for the RCL Stack.
RP-08-017, Form 2 Rev. 11 Date: 01/01/18 Page 5 of 6 Dose mRem 4.5 x10-7**
Dose mRem 2.0 x1Q-8 Dose mRem 5.9 x10-5***
SAFETY Radiation BWXT SEMI-ANNUAL EFFLUENT MONITORING Protection NOG-L REPORT-STACK EFFLUENT DATA Reporting Period: 1 January, 2025 to 30 June, 2025 NOTES:
RP-08-017, Form 2 Rev. 11 Date: 01/01/18 Page 6 of 6 (1)
The total exposure from all stacks is 0.034 mrem. Doses were determined using the EPA COMPLY code. Actual stack and building heights were used. A distance from source to receptor of 540 meters was used, with wind blowing towards the receptor at a speed of 2 meters/sec, 25% of the time. Other default parameters such as temperature were used if prompted. COMPLY itself is conservative.
(2)
All alpha activity is conservatively reported as U-234 for the NOG-L Stacks (except Waste Treatment) as this is the predominant uranium nuclide and has the most conservative dose conversion factor of the various uranium isotopes. For the L TC each nuclide above MDC is reported. The nuclides reported for Waste Treatment were from analyzed impinger samples collected over the reporting period and the values for non-uranium nuclides were correlated with the value of released alpha activity (reported as U-234 for other NOG-L stacks) to determine conservative values for released activity of each listed nuclide.
(3)
Beta/Gamma nuclides are not reported unless they exceed the respective MDC based on isotopic analysis.
(4)
Average concentrations, errors and MDCs are quoted as 0.01x10-12 µCi/ml for stacks when these values are between 5x10-15 µCi/ml and 0.01x10-12 µCi/ml, and they are quoted as <0.01x10-12 µCi/ml when the values are less than 5x 10-15 µCi/ml.
(5)
For NOG-L stacks, the activities are quoted as 0.01 µCi when these values are between 5x10-3 µCi and 0.01 µCi, and they are quoted as <0.01 µCi when the values are less than 5x 10-3 µCi. 5x 10-3 µCi is conservatively used to calculate the offsite dose when the activity is <0.01 µCi.
(6)
The error estimate is the daily error at the 95% confidence interval propagated over the six-month period.
(7)
Quantity released (µCi) is the sum of the activities calculated daily based on the calculated daily concentration for all concentrations> 0.
(8)
Twenty three (23) stacks were monitored during this monitoring period.
(9)
The results of this monitoring indicate ongoing compliance with the NRC dose constraint on environmental air emissions found in 10 CFR 20.1101 (d).
SAFETY RP-08-017, Form 3 BWXT SEMI-ANNUAL EFFLUENT MONITORING Rev. 11 Radiation NOG-L Date: 01/01/18 Protection REPORT-LIQUID EFFLUENT DATA Page 1 of 1 Reporting Period: 1 January, 2025 to 30 June, 2025 Location of sample: Prior to discharge in the James River Total Liquid Flow:
3.55x108 Liters Sample Collection: Batch composite sampler Total Liquid Effluent Release Concentration Error Estimate LLD Quantity Dose Radionuclide pCi/L
(+/- pCi/L)
(pCi/L)
Released (µCi) mRem U-234 (Y)
U-235 (Y)
U-236 (Y)
U-238 (Y) 20.66 5.36 0.18 8696 6.7x1Q-2 0.64 0.61 0.19 270 1.95x1Q-3 0.30 0.42 0.16 127 9.27x10-4 0.43 0.48 0.13 9276 1.27x1Q-3 TOTAL 7.11 x1Q-2 (1)
The total dose calculated for liquid release uses a dilution factor of 18: 1.
Regulatory Guide 1.109 was used as guidance, with conservative assumptions to estimate the exposure.
(2)
The semi-annual concentration reported above is a volume-weighted average for the six months and may be less than the averaged MDC for the same period.
(3)
Isotopic analysis is performed on the monthly composite samples for the most commonly utilized beta/gamma nuclides such as Sr-90, Tc-99 and Cs-137. The analysis of these nuclides typically indicates results less than minimum detectable concentration (MDC). No nuclide with a concentration above the respective MDC was reported.