ML24046A172
| ML24046A172 | |
| Person / Time | |
|---|---|
| Site: | 07000754 |
| Issue date: | 02/15/2024 |
| From: | Smyly J GE Hitachi Nuclear Energy |
| To: | Office of Nuclear Material Safety and Safeguards, Document Control Desk |
| References | |
| M240029 | |
| Download: ML24046A172 (1) | |
Text
HITACHI M240029 February 15, 2024 Chief, Fuel Facility Licensing Branch Division of Fuel Management Office of Nuclear Material Safety and Safeguards US Nuclear Regulatory Commission Washington, DC 20555-0001 Attn: Document Control Desk GE Hitachi Nuclear Energy Jeffrey Smyly Regulatory Compliance Manager 6705 Vallecitos Road Sunol, CA 94586 USA T 925-918-6074 Jeffrey.Smyly@ge.com
Subject:
Vallecitos Nuclear Center (VNC) Effluent Monitoring and Environmental Surveillance Programs 2023 Annual Report
References:
- 1) NRC License SNM 960, Docket 070-00754 Enclosed is the 2023 Effluent Monitoring and Environmental Surveillance Programs Annual Report for the Vallecitos Nuclear Center (VNC) in Sunol, California.
If you have questions regarding this report or need additional information, please contact me using the contact information above.
Sincerely, Jeff Smyly Jeffrey Smyly, Digitally signed by Jeff Smyly ON: cn=Jeff Smyly gn=Jeff Smyly c=US United States l=US United States o=GEH ou=Vallecitos Nuclear Center Regulatory Compliance e=jeffrey.smyly@ge.com Reason: I am approving this document Location:
Date: 2024-02-15 09:56-08:00 Regulatory Compliance Manager
Enclosure:
Effluent Monitoring and Environmental Surveillance Programs, 2023 Annual Report JS24-002
USNRC M240029 February 15, 2024 cc: 1) Leonard Ash, (ACWD), leonard.ash@acwd.com
- 2) Matthew Soby (ACDEH), Matthew.Soby@acgov.org
- 3) Radioactive Materials Licensing Section California Department of Public Health Radiologic Health Branch 1500 Capitol Avenue, Suite 520, MS 7610 Sacramento, CA 95814-5006 Attn: Ira Schneider Page 2 of 2
- 4) Colleen Winey (Zone 7 Water Agency), cwiney@zone7water.com
- 5) American Nuclear Insurers 95 Glastonbury Boulevard, Suite 300 Glastonbury, CT 06033 Attn: Seth Breitmaier
- 6) USNRC, Region IV 1600 East Lamar Boulevard Arlington, TX 76011-4511 Attn: Regional Administrator
- 7) Osiris Siurano-Perez Project Manager Fuel Facility Licensing Branch Division of Fuel Management US Nuclear Regulatory Commission Mail Stop: TWFN 4A60 Washington, DC 20555-0001
- 8) Duane A. Hardesty Project Manager, NRC/NRR/DANU/UNPL
HITACHI EFFLUENT MONITORING AND ENVIRONMENTAL SURVEILLANCE PROGRAMS 2023 ANNUAL REPORT February 15, 2024 GE Hitachi Nuclear Energy, LLC
M240029 US NRC 02/15/2024 NOTICE AND DISCLAIMER GE Hitachi Nuclear Energy, LLC (GEH) prepared this document. GEH and contributors to this document do not:
make any warranty or representation, expressed or implied, that the use of any information disclosed may not infringe privately owned rights; or assume responsibility for liability or damage of any kind, which may result from the use of any information disclosed.
1
M240029 US NRC 02/15/2024 TABLE OF CONTENTS LIST OF FIGURES AND TABLES....................................................................................................................................... 3 ABSTRACT...................................................................................................................................................................... 4
1.0 INTRODUCTION
....................................................................................................................................................... 5 1.1 1.2 1.3 Effluent Monitoring Program Environmental Surveillance Program Laboratory Analyses 5
6 7
2.0 EFFLUENT MONITORING DATA................................................................................................................................ 8 2.1 2.2 Water Effluent Air Effluent 8
8 3.0 ENVIRONMENTAL SURVEILLANCE DATA................................................................................................................. 9 3.1 Groundwater 9
3.2 Stream Bottom Sediments 9
3.3 Vegetation 9
3.4 Gamma Monitoring 9
3.5 Ambient Air Monitoring 9
4.0 REFERENCES
........................................................................................................................................................... 10 5.0 DEVIATIONS AND ANOMALIES.............................................................................................................................. 11 5.1 5.2 5.3 Temporary Loss of Sampling Capabilities Unplanned Potential Releases Local Action Level Exceedances 11 11 11 6.0
SUMMARY
........................................................................................................................................................... 112 2
M240029 US NRC 02/15/2024 Figure 1
2 3
4 Table 1
2 3
4A 48 5
6 7
8 9
10 11 12 LIST OF FIGURES AND TABLES Title Page Topographic Map Of VNC 13 Sanitary and Industrial Discharge Treatment Facility 14 Water Sampling Locations 15 Air Sampling Locations and Gamma Monitoring Points 16 Title Page Sample Collection Schedule 17 Groundwater Well Information 18 Stack Specifications 19 Monthly Water Effluent Samples 20 Imhoff Tank Sludge Sample 20 Groundwater Samples 21 Stream Bottom Sediment Samples 22 Vegetation Samples 22 Gamma Monitoring Dosimetry Results 23 Ambient Air Monitoring 24 Stack Air Monitoring - Particulates 25 Stack Air Monitoring - Noble Gases 26 Stack Air Monitoring - Halogens 26 3
M240029 US NRC 02/15/2024 ABSTRACT This report summarizes activities performed and data collected for the Effluent Monitoring and Environmental Surveillance Programs at Vallecitos Nuclear Center (VNC) during the 2023 calendar year. The program analyzes water, air, sediment, and vegetation samples and measures radiological dose around the site perimeter for compliance with regulatory limits.
Based on the analytical results of radiological samples collected from locations on-and off-site during the reporting period, VNC is compliant with all licenses issued by the U.S. Nuclear Regulatory Commission and California Department of Health, Radiologic Health Branch.
Copies of laboratory analysis reports are on file at VNC.
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M240029 US NRC 02/15/2024
1.0 INTRODUCTION
This report summarizes activities performed and data collected for the Effluent Monitoring and Environmental Surveillance Programs at Vallecitos Nuclear Center (VNC) during the 2023 calendar year. This report has been prepared to demonstrate compliance with state and federal regulations and license requirements. Section 1.0 presents background information, and sections 2.0 and 3.0 present data collected during the monitoring period.
VNC is several hundred acres in size. It is located on the northern side of Vallecitos Valley as shown in Figure 1.
Most of the site is undeveloped with hills ranging in elevation from approximately 1,000 to 1,300 feet above sea level. Approximately 135 acres in the southwest corner and situated between the 400- and 600-foot topographic contours are developed. The ground surface of this portion of the site slopes to the southwest.
VNC utilizes three drainage systems: industrial, sanitary, and storm. The industrial and sanitary systems discharge effluent water into one of four 50,000-gallon retention basins located in the southwest corner of the site (Figure 2). The storm drainage system, consisting of natural ditches, discharges storm water into a ditch parallel with Vallecitos Road (State Route 84). Storm drains from Buildings 103, 104, and 106 discharge to the west drainage ditch, and storm drains in the Building 102, 105, 200, and 300 areas discharge to the east drainage ditch. As shown in Figures 2 and 3, these ditches merge prior to exiting the southwest corner of the site.
Groundwater levels of the developed site vary from 2 to 3 feet below ground surface (during winter near Retention Basins 2 and 3) to 30 to 40 feet (during the summer northwest of the road leading to the water tank). A U.S. Geological Survey (USGS) study shows that groundwater generally flows toward the southwest. The velocity of groundwater is estimated by USGS to be about 0.01 ft/day in clays to 8 ft/day in gravels. In areas where gravels with a considerable mixture of clay (most of developed site) are saturated close to the land surface, southwesterly movement occurs at an average rate of approximately 2 ft/day1.
1.1 Effluent Monitoring Program The Effluent Monitoring Program verifies that effluent release limits listed in Appendix B of 10CFR20 are not exceeded. The Program includes measuring radioactive constituents in water discharged through the site sanitary and industrial wastewater systems and air discharged through building exhaust stacks.
Water Discharges Effluent water discharge from VNC is made up of industrial wastewater, sanitary wastewater, and stormwater runoff.
Samples of effluent water are taken and analyzed for radiological constituents prior to release. The schedule of sample collection at VNC is presented in Table 1.
Discharges of industrial wastewater consist primarily of non-contact cooling water. The discharges are held in one of two 50,000-gallon retention basins and used for non-potable purposes, such as on-site irrigation. There have been no discharges to surface waters from these retention basins since July, 1 2003. Samples are collected from each basin prior to discharge by irrigation to an on-site field (see Figure 2). In addition, samples from all basin discharges are accumulated and analyzed at specified intervals for a variety of constituents.
Sanitary waste (sludge) is collected in an Imhoff tank before undergoing sand filtration and chlorination by addition of sodium hypochlorite solution. The Imhoff tank is cleaned out periodically, at which time sludge samples are collected and analyzed for radioactive constituents. The Imhoff tank was cleaned out once during 2023. After processing, sanitary wastewater is discharged by irrigation to an on-site field (see Figure 2).
All on-site irrigation is monitored so that no surface runoff occurs.
Storm water runoff contains known contaminants. These waters flow directly to drainage ditches that enter Vallecitos Creek.
1A delay of over 2 years from the nearest postulated spill point to the site boundary.
5
M240029 US NRC 02/15/2024 Air Effluent Monitoring Several operations at VNC use exhaust stacks, listed in Table 3. For these operations, air is collected from single or multiple operating areas via a ventilation system. The ventilation system is generally comprised of ductwork, particulate filtration systems, blowers, and an exhaust stack.
Air effluents from these exhaust stacks are monitored for radiological constituents. Stack air sampling systems are used to determine particulate and halogen releases. Noble gas releases, which are primarily Argon-41 2, are obtained from charts or electronic integrators on monitoring equipment.
The various site operating licenses (NRC SNM-960, NRC R-33, and California 0017-01) and federal regulations require that air effluents released to unrestricted areas be limited and controlled to maintain the concentrations of radioactive material in the unrestricted area as low as reasonably achievable but at least no greater than the values in Appendix B, Table II of 10CFR20. Compliance with these limits is achieved by establishing average release limits and local action levels for each stack and measuring the average releases through monitoring or sampling of the effluents. The local action levels are generally established as 10% of the license release limits and are based on a measurement above background variation at the 95% confidence level.
Additionally, the EPA COMPLY computer code is used to determine the dose at the site boundary from annual airborne effluents. This evaluation was formerly required when 40CFR61 Subpart I applied to NRC licensees, which included VNC. The regulation was since amended to exclude NRC licensees, but VNC continues to run the COMPLY code to demonstrate compliance with the constraint rule per Regulatory Guide 4.20 and 10CFR20.1101(d) to verify compliance with annual public dose per 10CFR20.1301.
1.2 Environmental Surveillance Program The Environmental Surveillance Program determines if any radioactivity from VNC is detectable in the environment.
The Program includes measuring radioactive constituents in groundwater wells, neighboring streams, and vegetation at locations near or beyond the site perimeter. Samples of groundwater, stream bottom sediments, and vegetation are collected at periodicities shown in Table 1.
Groundwater Monitoring Groundwater is monitored by collecting samples from eight wells located on or near VNC and analyzing the samples for radiological constituents. All groundwater wells are sampled annually except for GA, GN, and GP, which are sampled quarterly. A background well, MW-lOR, was added in 2022 which is also sampled on an annual basis. Well identification numbers, corresponding California State Well Numbers, and descriptions of locations are listed in Table 2. Well locations are shown in Figure 3.
Vegetation Monitoring Vegetation is monitored by collecting and analyzing samples of vegetation at two locations designated V-2 and Val-IV. V-2 is located on the easternmost stream crossing the south boundary of VNC. VAL-IV is located west of the VNC boundary, about 500 feet down Little Valley Road.
Stream Bottom Sediment Monitoring Stream bottom sediment is monitored by collecting and analyzing samples at one location designated as 5-4. 5-4 is located at the outfall of the retention basins at south boundary of site.
2In recent history, Argon-41 discharges have been exclusively the product of air activation during operation of the Nuclear Test Reactor (NTR)
(stack number 16). The NTR permanently ceased operations on December 21, 2023. As per GEH License Amendment Request - Permanent Cessation of the GE Nuclear Test Reactor (NTR) and Possession Only License, dated October 6, 2023, (ADAMS ML23279A110) continued effluent monitoring as an input to the site annual effluent report will be discontinued.
6
M240029 US NRC 02/15/2024 Air Monitoring There are four environmental air monitoring stations at VNC designated as A-1 through A-4. The stations are positioned approximately 90° apart around the operating facilities of the site. The locations of the stations are shown in Figure 4.
Each air monitoring station is equipped with a membrane filter and an activated charcoal cartridge. The filter is changed weekly3 and counted for gross alpha and gross beta radiation. The cartridge is removed and analyzed only in the event of a suspected radioactive iodine release.
Gamma Monitoring There are 20 locations at VNC for measuring gamma radiation in the environment, shown in Figure 4. Each station is constructed of a mailbox containing an optically stimulated luminescence (OSL) dosimeter that meets the requirements of ANSI/HPS Standard N13.37. The dosimeters are exchanged annually.
For reporting purposes, the dosimeters are distributed as follows:
South Boundary: Stations 1 through 3 East Boundary: Stations 4 through 6 North Boundary: Stations 7, 12, and 13 West Boundary: Stations 8 through 11 Background Dosimeters: Stations 14 through 20 The dosimeter vendor (Landauer) reports the dose measurements of each dosimeter and determines the background dose measurement.
Background dose is determined using dosimeters exposed to background radiation at VNC.
1.3 Laboratory Analyses On-site and external laboratories perform the analyses of samples collected at VNC. Sample radioanalytical results are reported as a measured value or as less than minimum detectable activity (MDA) values. Values within the statistical background may be listed as zero or as positive or negative numbers. All analyses are performed using approved EPA methodology with minimum sensitivities equal to or less than local action levels.
Original radioanalytical results are maintained at VNC.
On-site Laboratory Analyses The on-site laboratory at VNC can quantitatively analyze gross alpha-and beta-emitter radioactivity in air and water. The laboratory is also capable of quantitative tritium analysis in water and qualitative isotopic identification with gamma spectroscopy.
Off-site Laboratory Analyses External laboratories contracted to analyze VNC samples are Davi Laboratories, located in Hercules, California, and GEL Laboratories, located in Charleston, South Carolina. Both Davi and GEL Laboratories are accredited by the California Environmental Laboratory Accreditation Program (certificates 1438 and 2940, respectively).
Davi laboratories is used for routine radiological analyses on samples of water, stream bottom samples, and vegetation. GEL Laboratories is used as needed for advanced radionuclide analysis, such as for alpha spectroscopy and quantification of hard-to-detect radionuclides.
3 During dusty conditions, filter may be changed more frequently as determined by Radiological Monitoring Technicians.
7
M240029 US NRC 02/15/2024 2.0 EFFLUENT MONITORING DATA Radioanalytical results of air and water effluent samples collected in 2023 from locations on-and off-site indicate VNC is compliant with all licenses issued by the U.S. Nuclear Regulatory Commission and California Department of Health, Radiologic Health Branch.
2.1 Water Effluent Table 4A summarizes radioanalytical results of composite industrial and sanitary effluent water samples prior to release by on-site irrigation. VNC has no radiological liquid effluent pathways, and sampling for radiological contamination in industrial effluent is not required by the State of California. Monthly sampling results are from composite samples of one or more water releases.
Table 48 provides radioanalytical results from the Imhoff tank, which was cleaned out in May 2023.
All treated sanitary and industrial wastewater was discharged via the VNC on-site irrigation system. There was one instance of an anomalous release of sanitary wastewater, detailed in Section 5. The release had no indications of radiological impacts to the environment.
2.2 Air Effluent Air effluents are monitored for stack shown in Table 3. Analytical results of stack air samples are listed in Tables 10 through 12.
Using the parameters of Table 3 and Tables 10 through 12, the calculated Effective Dose Equivalent at Screening Level 2 resulting from the annual measured releases, as calculated by the EPA's COMPLY Code, are:
Property Line:
0.3 mrem/year due to all emissions 1.3E-04 mrem/year from Iodine Site Developed Area:
1.9 mrem/year due to all emissions, and 8.5E-04 mrem/year from Iodine.
8
M240029 US NRC 02/15/2024 3.0 ENVIRONMENTAL SURVEILLANCE DATA The Environmental Surveillance Program determines if any radioactivity from VNC is detectable in the environment.
The Program includes measuring radioactive constituents in groundwater wells, neighboring streams, and vegetation at locations near or beyond the site perimeter.
All radioanalytical results from environmental samples collected in 2023 indicate VNC is compliant with all licenses issued by the U.S. Nuclear Regulatory Commission and California Department of Health, Radiologic Health Branch.
3.1 Groundwater Analytical results of groundwater samples from the monitoring wells listed in Table 2 are listed in Table 5.
3.2 Stream Bottom Sediment Analytical results of the stream bottom sediment sample are listed in Table 6.
3.3 Vegetation Analytical results of vegetation samples are listed in Table 7.
3.4 Gamma Monitoring Dose results from gamma monitoring are listed in Table 8.
3.5 Ambient Air Monitoring Analytical results of environmental air samples collected are in Table 9.
9
M240029 US NRC 02/15/2024
4.0 REFERENCES
Licenses containing requirements for this Environmental Monitoring Report are as follows:
- 1.
United States Nuclear Regulatory Commission (USNRC) License SNM-960
- 2.
United States Nuclear Regulatory Commission (USNRC) License R-33
- 3.
State of California Radiologic Health Branch License 0017-01 10
M240029 US NRC 02/15/2024 5.0 DEVIATIONS AND ANOMALIES This section presents anomalies, deficiencies, or deviations in adherence to the Effluent Monitoring and Environmental Surveillance Programs at VNC for the 2023 calendar year.
5.1 Temporary Loss of Sampling Capabilities In 2023, there were three instances of local power outages from VNC's electricity provider (Pacific Gas and Electric) that affected two of the four environmental air samplers. The outages occurred on weekends when no active radiological work was taking place at VNC and the Nuclear Test Reactor (NTR) was shut down. Radioanalytical results were adjusted to account for the loss of sampling time and consequent smaller sample volume.
There was also one instance of an accidental power loss to a single environmental air sampler due to on-site maintenance. There was active radiological work at VNC during the period of power loss. The condition was recorded in the GEH corrective action program. Although no environmental releases were suspected during the power loss, and any potential environmental releases during that period were accounted for by other local sampling and monitoring methods within the work area.
5.2 Unplanned Potential Releases There was one instance of an anomalous release of sanitary wastewater in May 2023 due to a break in an on-site pipeline. The water was contained, sampled, and analyzed for radiological constituents, all of which were below minimum detectable activities. Therefore, the release had no radiological impact to the environment.
5.3 Local Action Level Exceedances There were two periods of time in 2023 where environmental air samples exceeded gross beta radioactivity local action levels established by VNC. Both observations were recorded in the GEH corrective action program. All samples were recounted and analyzed further with gamma spectroscopy in accordance with VNC procedures.
The first period was in May 2023, when the VNC fire breaks were created and there was active paving and grading operations on Highway 84 at the front of the VNC facility. No radionuclides related to VNC operations were observed on the air sample filters. The increase in beta radioactivity was attributed to the operations causing an increase in air particulates that contain natural radon daughters.
The second period was in November and December 2023, which is consistent with past seasonal variations in environmental radioactivity at VNC. No radionuclides related to VNC operations were observed on the air sample filters. The increase in beta radioactivity was attributed to normal, seasonal meteorological changes that increase ambient radioactivity levels in the VNC region.
11
M240029 US NRC 02/15/2024 6.0
SUMMARY
Based on the 2023 analytical results of water, air, sediment, and vegetation samples and measured radiological doses around the VNC perimeter, VNC is compliant with all regulatory requirements and licenses issued by the U.S.
Nuclear Regulatory Commission and California Department of Health, Radiologic Health Branch. The effluent monitoring and environmental surveillance programs in place at VNC continue to be effective.
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M240029 US NRC 02/15/2024 1 Mile Scale 1 :24,000 Figure 1. Topographic Map of GE Vallecitos Nuclear Center 13 based on USGS Maps, Lacosta Valley and Livermore, CA
M240029 US NRC 02/15/2024
===== S:inn:iry Pipeline
- *- **-* ** **-* ** *** lnd.Jslri al Di sch:irge Pipeline IMHO FF Tank Outrall Ba sin mg31ion Pump and Basin N1 Straine r Retention Basins 3/4 Chemic;iV' Storage Building I
+--:'$-;'h Natural Drainage lsol31ion \/ah.es 3 P.ows, 10 Spriklers Each Sanitary tield lsolato n 1/4 Ives ff' Sanitary Land Discharge Pipeline Distribution 1/4Ives Isolation 1/4Ives
~
Isolation Val.es Basin
__ 0 Sump Pump
/I
,;fj
~
l_cz_4g.__~4'._4L~%:_4L~~~4g.__~4'._cm Outran Basin Weir Box Pump House Vallecilos Road (state Route 84)
Figure 2. Sanitary and Industrial Discharge Treatment Facility 14 Pipeline to Lake or IW I.and Discharge Field
M240029 US NRC 02/15/2024 TIJRNER LANE Ii
~
X,i ALPHA
~
UNE "I,.
is....
ij ul
& i I j
~
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~
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METALll.lRGY AND CH!M51R E' PRODUCTS CES FACILfflES MW-2 $-
Figure 3. Water Sampling Locations 15 WATER TANK
& * - - MW-ll)R ~
- IViSR*SE CATTLE WEI.I.$-
M240029 US NRC 02/15/2024 VALLECITOS ROAD (HWY 84)
Figure 4. Air Sampling Locations and Gamma Monitoring Points 16
M240029 US NRC 02/15/2024 Location E-001 and E-002 (Basin 1-4)
S-4 Stream Bottom (Sediments)
V-2 & VAL IV (Vegetation)
Groundwater Wells TABLE 1 SAMPLE COLLECTION SCHEDULE Constituent Sample Type Frequency Gross Alpha Grab Each discharge Gross Beta Grab Each discharge Gross Alpha Composite Monthly Gross Beta Composite Monthly Gross Alpha Grab Annually, usually first week in May Gross Beta Grab Annually, usually first week in May Co-60, Cs-137 Grab Annually, usually first week in May Gross Alpha Grab Annually, usually first week in April Gross Beta Grab Annually, usually first week in April Gross Alpha Grab Quarterly (GA, GP, GN) or Annually Gross Beta Grab Quarterly (GA, GP, GN) or Annually Tritium Grab Quarterly (GA, GP, GN) or Annually Sr-90 Grab Quarterly (GA, GP, GN) or Annually 17
M240029 US NRC 02/15/2024 Site Well Number GN GA GP MW-1 MW-7 MW-8 MW-9S MW-9D EVESR-SE MW-lOR (Background)
TABLE 2 GROUNDWATER WELL INFORMATION California State Well Number Location Description 4S/1E-2Nl Southeast of Building 105 4S/1E-10Al Southwest of Building 102 4S/1E-10P3 0.6 miles southwest of site entrance (private property) 4S/1E3R2 Bldg. 102 Parking Lot 4S/1E-10G3 Southwest from Basins 4S/1E2M01 Southwest of GETR Reactor 4S/1E2Pl Southwest of EVESR and VBWR Reactors 4S/1E2P2 Southwest of EVESR and VBWR Reactors N/A 20 ft east of EVESR at southwest exterior corner 4S-1E02L004 East-northeast of the GETR, EVESR, and VBWR Reactors 18
M240029 US NRC 02/15/2024 Stack Number 4
12 16 261 30 341 371 Location Bldg. 102A Bldg. 103 Bldg. 105 Area 200 Waste Evaporator Waste Storage HSF Bunker TABLE 3 STACK SPECIFICATIONS Height Components Serviced (ft above ground)
- Remote Handling Operation
- Isotope Production Facility
- Radiochemistry 75
- Remote Handling Operations Radioactive Materials Storage Room
- Metallurgy and Ceramics Laboratories 48
- Chemistry Laboratories
- Nuclear Test Reactor 45
- General Electric Test 29 Reactor (GETR)
- Liquid Waste Evaporator 25
- Waste Storage Facility 25 (Sandblast Room)
- Bunker Area of Hillside 40 Storage Facility
'Stacks 26, 34, and 37 did not operate during 2023 19 Diameter Flow Rate (in)
(cfm) 66 35,875.0 60 29,323.9 13.5 X 13.5 1,623.0 19 N/A 13 X 17.75 3,492.6 13 X 17.75 N/A 35 N/A
M240029 US NRC 02/15/2024 Month January February March April May June July August September October November December TABLE 4A MONTHLY WATER EFFLUENT SAMPLES Action Levels Gross Alpha: 7.1 pCi/L Gross Beta: 7.1 pCi/L Tritium: 2000 pCi/L Monthly Effluent (Industrial)
Monthly Effluent (Sanitary)
(pCi/L)
Gross Alpha Gross Beta Tritium Gross Alpha 2.56 1.08 553 1.55 3.19 3.94 551 3.64 4.73 1.88 244 2.27 2.59 1.62 552 2.20 1.73 1.34 734 4.11 3.61 301 3.49 2.37 635 4.14 2.84 695 4.91 2.96 916 No Discharges 2.68 3.36 511 3.70 2.28 328 3.42 TABLE 4B IMHOFF TANK SLUDGE SAMPLE Month Gross Alpha (pCi/g)
May 0.13 Action Levels Gross Alpha: 11 pCi/g Gross Beta: 15 pCi/g Gross Beta (pCi/g) 0.73 20 Co-60 (pCi/g)
Not Detected (pCi/L)
Gross Beta Tritium 1.16 228 3.57
<MDA 3.11 451 2.51 49 No Discharges No Discharges No Discharges No Discharges No Discharges No Discharges No Discharges 3.20 18 Cs-137 (pCi/g)
Not Detected
M240029 US NRC 02/15/2024 Month January May July October Annual Average Gross Alpha 4.17 3.76 1.85 4.40 3.55 Month January Month January Month May 4S/1E-2Nl (GN)
(pCi/L)
Gross Sr-90 Beta 3.12 0.88 3.23 0.34 2.38 1.62 2.57 1.55 2.83 1.10 TABLE 5 GROUNDWATER SAMPLES Tritium 392 595 411 979 594 Action Levels Gross Alpha: 7.1 pCi/L Gross Beta: 7.1 pCi/L Tritium: 2000 pCi/L 4S/lE-l0Al (GA)
(pCi/L)
Gross Gross Sr-90 Alpha Beta 3.80 2.30 0.97 4.60 3.17 0.94 3.76 2.29 1.95 4.41 3.47 1.79 4.14 2.81 1.41 MW-8 (4S-1E2M01)
(pCi/L) 4S/1E-10P3 (GP)
(pCi/L)
Tritium Gross Gross Sr-90 Tritium Alpha Beta 24 2.33 2.27 0.37 12 89 4.54 1.42 0.68 81 710 4.77 2.98 1.40 112 308 4.85 3.18 1.06 653 283 4.12 2.46 0.88 215 MW-9S (4S-1E2Pl)
(pCi/L)
Gross Gross Beta Sr-90 Tritium Gross Gross Sr-90 Tritium Alpha Alpha Beta 0.67 1.45 0.82 294 0.86 1.02 0.00 343 MW-9D (4S-1E2P2)
EVESR-SE (pCi/L)
(pCi/L)
Gross Gross Sr-90 Tritium Gross Gross Sr-90 Tritium Alpha Beta Alpha Beta 2.33 3.58 0.64 514 3.07 2.34 0.29 49 MW-1 (1E-3R2)
I MW-7 (1E-10G3)
(pCi/L)
I (pCi/L)
Gross Gross Sr-90 Tritium Gross Gross Sr-90 Tritium Alpha Beta Alpha Beta 4.01 0.89 0.93 285 4.89 1.00 0.88 136 MW-l0R (1E02L004) - Background Well (pCi/L)
Month Gross Gross Sr-90 Tritium Alpha Beta January 3.07 1.49 0.75 404 21
M240029 US NRC 02/15/2024 Sample S-4 Sample V-2 VAL-IV Average TABLE 6 STREAM BOTTOM SEDIMENT SAMPLE Month May Action Levels Gross Alpha: 11 pCi/g Gross Beta: 15 pCi/g Gross Alpha Gross Beta (pCi/g)
(pCi/g) 0.20 0.43 TABLE 7 VEGETATION SAMPLES Action Levels Gross Alpha: 2.4 pCi/g Gross Beta: 9.3 pCi/L Month Gross Alpha (pCi/g)
May 0.19 May 1.23 0.71 22 Co-60 Cs-137 (pCi/g)
(pCi/g)
Not Detected Not Detected Gross Beta (pCi/g) 1.79 2.34 2.07
M240029 US NRC 02/15/2024 South Boundary Station (mRem/yr) 1 1
76.7 TABLE 8 GAMMA MONITORING DOSIMETRY RESULTS Dosimeter collection date: December 2023 East Boundary West Boundary North Boundary
Background
Station (mRem/yr) 1 Station (mRem/yr) 1 Station (mRem/yr) 1 Station (mRem/yr) 1 4
73.3 7
87.4*
8 80.3 14 77.3 I
2 76.1 5
71.6 12 77.9 9
I 71.3 15 82.0
--------------- ----------~---------------- - -- -- -- -- -- --------------
I 3
70.3 6
75.7 13 83.0 lQ I
75.4 16 75.1 I
~--------~---------~-----------1--------------------------- - -- -- -- -- -- --------------
11 I
78.6 17 77.1 I
~----------+- -- -- -- -- -- --------------
18 80.1 19 79.1 20 91.2*
1Gross values shown (no background subtraction) 2Dose greater than Control Dosimeter. Cont rol dosimeter read 84 mRem/yr (located in Building 102B).
23
M240029 US NRC 02/15/2024 January February March April May June July August September October November December Annual STATION ONE Beta Alpha 2.48E-14 8.06E-16 4.32E-1 4 2.21E-15 l.85E-14 l.23E-15 l.88E-14 9.98E-16 2.00E-14 l.16E-15 2.13E-14 9.82E-16 2.lSE-14 l.12E-15 2.66E-14 l.45E-15 2.58E-14 l.75E-15 3.48E-14 l.63E-15 5.87E-14 2.41E-15 6.08E-14 2.62E-15 3.13E-14 1.SSE-15 TABLE 9 AMBIENT AIR MONITORING Action Levels Beta: 6.6x10-14 µCi/ml Alpha: 5.9xl0-14 µCi/ml Average Activity (µCi/ml)
STATION TWO STATION THREE Beta Alpha Beta Alpha 2.43E-14 l.25E-15 2.07E-14 8.91E-16 4.56E-14 2.22E-15 4.llE-14 2.71E-15 2.37E-14 l.80E-15 2.SlE-14 l.24E-15 2.75E-14 l.46E-15 2.52E-14 l.38E-15 2.78E-14 l.20E-15 2.96E-14 1.57E-15 2.41E-14 9.38E-16 2.80E-14 l.19E-15 2.69E-14 l.0SE-15 3.llE-14 l.84E-15 2.70E-14 l.89E-15 3.23E-14 1.SlE-15 2.81E-14 l.S0E-15 3.46E-14 2.22E-15 3.69E-14 l.67E-15 4.37E-14 l.85E-15 5.97E-14 2.53E-15 7.62E-141 6.54E-15 5.79E-14 2.SSE-15 7.60E-141 3.89E-15 3.43E-14 1.69E-15 3.92E-14 2.30E-15
'Sample activities exceeding action levels are further analyzed for VNC ra dionuclides per VNC procedure VSS 7.2, "Radioactive Effluent Control".
24 STATION FOUR Beta Alpha 2.07E-14 8.68E-16 3.98E-14 2.31E-15 2.30E-14 l.06E-15 2.12E-14 l.0SE-15 2.16E-14 l.43E-15 3.24E-14 l.06E-15 4.73E-14 l.0SE-15 5.54E-14 l.31E-15 3.91E-14 l.64E-15 4.29E-14 1.SSE-15 6.39E-14 4.67E-15 5.89E-14 3.0lE-15 3.90E-14 1.77E-15
M240029 US NRC 02/15/2024 January February March April May June July August September October November December Annual TABLE 10 STACK AIR MONITORING-PARTICULATES Total Activity (µCi)
STACK 4 STACK 12 STACK 16 STACK 30 Beta Alpha Beta Alpha Beta Alpha Beta Alpha 5.SSE-01 l.32E-02 l.66E-01 5.6SE-03 2.40E-02 5.33E-04 l.84E-02 l.38E-03 6.34E-01 8.SSE-03 l.27E-0l 8.22E-03 3.29E-02 l.08E-03 l.95E-02 1.lOE-03 9.38E-01 l.46E-02 l.llE-01 6.70E-03 3.l0E-02 l.52E-03 2.47E-02 l.32E-03 l.09EO0 l.28E-02 8.54E-02 l.34E-03 2.18E-02 l.0SE-03 2.79E-02 l.lOE-03 l.0SE+00 l.S0E-02 l.80E-01 4.96E-03 3.lSE-02 8.99E-04 4.57E-02 l.16E-03 8.48E-01 l.28E-02 l.24E-01 4.78E-03 2.18E-02 5.79E-04 3.32E-02 l.16E-03 l.19E+00 8.SSE-03 2.09E-01 4.78E-03 2.SSE-02 l.17E-03 4.34E-02 l.42E-03 1.40E+00 l.28E-02 l.53E-01 5.73E-03 3.98E-02 l.26E-03 3.37E-02 8.81E-04 7.26E-01 8.19E-03 l.38E-01 3.83E-03 2.57E-02 9.73E-04 3.18E-02 5.02E-04 4.59E+00 l.71E-02 2.09E-01 9.37E-03 4.08E-02 8.38E-04 4.00E-02 l.13E-03 6.76E-01 l.18E-02 l.58E-01 6.89E-03 5.77E-02 2.00E-03 2.89E-02 l.29E-03 6.0SE-01 l.64E-02 l.SlE-01 6.31E-03 8.33E-02 l.81E-03 3.02E-02 l.19E-03 1.43E+0l 1.52E-01 1.SlE+00 6.86E-02 4.36E-01 1.37E-02 3.77E-01 l.36E-02 25
M240029 US NRC 02/15/2024 I
TABLE 11 STACK AIR MONITORING-NOBLE GASES Noble Gas Activity (Ci)
Month STACK 16 January 2.11 February 6.61 March 8.09 April 4.68 May 6.01 June 7.83 July 6.82 August 8.96 September 7.48 October 5.61 November 5.61 December 2.07 TOTAL 71.88 TABLE 12 STACK AIR MONITORING - HALOGENS 1-131 Activity (µCi)
STACK4 STACK 12 STACK 16 Annual
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