ML25121A328

Annual Shutdown Reactor Reports for the Year 2024

ML25121A328
Person / Time
Site:	Vallecitos Nuclear Center, Vallecitos
Issue date:	05/01/2025
From:	Ball A NorthStar Vallecitos
To:	Office of Nuclear Material Safety and Safeguards, Document Control Desk
References
NVS25-012
Download: ML25121A328 (1)

Text

$

North Star NSV 25-012 May 1, 2025 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

SUBJECT:

Annual Shutdown Reactor Reports for the Year 2024 Vallecitos Nuclear Center Docket Nos. 50-18, 50-183 and 50-70 License No. DPR-1, DR-10 and TR-1 Northstar Vallecitos, LLC 6705 Vallecitos Rd.

Sunol, Ca 94586 www.northstar.com AdamW. Ball Vallecitos Site Manager 10 CFR 50.54 Enclosed are the 2024 Annual Reports for the deactivated Reactors (Vallecitos Boiling Water Reactor (VBWR), ESADA-Vallecitos Experimental Superheat Reactor (EVESR), and the General Electric Test Reactor (GETR) located at the Vallecitos Nuclear Center near Sunol, California.

This letter contains no new regulatory commitments.

Should you have any questions concerning this letter, or require additional information, please contact Mr. Thomas B. Silko at (802) 451-5354, Ext 2506.

Sincerely, J2C}

Adamw. Ball, Vallecitos Site Manager

Enclosures:

1.

VBWR Annual Report No. 60

2.

EVESR Annual Report No. 57

3.

GETR Annual Report No. 66

NSV 25-012 / Page 2 of 3 cc: Director, Office of Nuclear Material Safety and Safeguards U.S. Nuclear Regulatory Commission Washington, DC 20555 Regional Administrator, Region 4 U.S. Nuclear Regulatory Commission 1600 East Lamar Boulevard Arlington, Texas 76011-4511

NSV 25-012 Docket Nos. 50-18, 50-183 and 50-70 VBWR Annual Report No. 60 (8 pages excluding this cover sheet)

NSV 25-012 / Enclosure 1 / Page 1 of 8

~

North Star VALLECITOS BOILING WATER REACTOR (DEACTIVATED)

ANNUAL REPORT NO. 60 FOR THE YEAR 2024 LICENSE DPR-1 DOCKET 50-18 April 2025 Vallecitos Nuclear Center Sunol, California

VBWR Annual Report No. 60 Vallecitos Boiling Water Reactor

( Deactivated)

Annual Report No. 60 NSV 25-012 / Enclosure 1 / Page 2 of 8 GE Hitachi Nuclear Energy has maintained the Vallecitos Boiling Water Reactor (VBWR) in a deactivated status under the authority of Amendment No. 21 to License DPR-1, Docket 50-18, issued Oct 22, 2007. In this annual report, a summary of the status of the facility for the period of January 1, 2024, to December 31, 2024, is presented, as required by paragraph 5.d.2 of the license.

1.0

SUMMARY

All reactor systems have been removed from the containment.

Structural conditions and radiation and contamination levels remain at acceptable levels.

Environmental data is maintained on site and available for review.

2.0 STATUS OF FACILITY In accordance with written procedures, the Facility Manager controls access to the containment building and general systems. The facility continues to be in deactivated status in safe storage condition.

3.0 ROUTINE PATROLS The facility was inspected weekly, quarterly, and annually in accordance with written procedures.

Patrols identified the following:

Unchanged efflorescence on the basement walls and floor.

Unchanged spalling of concrete, corrosion stains and rebar corrosion on the Basement Pump Foundation pedestal.

Unchanged Seepage of water into the basement bore location.

These conditions have been evaluated, pose no threat to structural integrity, and are being monitored. The structural condition of the facility is being actively monitored and is structurally sound to ensure maximum protection for public health and safety.

Page 1 of 2

NSV 25-012 / Enclosure 1 / Page 3 of 8 VBWR Annual Report No. 60 4.0 RADIATION AND CONTAMINATION Complete radiation and contamination surveys of the facility indicate that levels remain low.

Results of the surveys are presented in attachment 1. Air sampling results are presented in attachment 2. The radiation/contamination levels listed are representative but not necessarily maximum values.

Analytical results of groundwater samples are available in the Annual Environmental Report submitted on March 5, 2025.

5.0 ACTIVITIES Inspection of the installed gauges showed no propagation of concrete cracking.

There were no preventive or corrective maintenance activities performed having safety significance during the reporting period.

6.0 ORGANIZATION The Site Manager is K. Zanotto. The VBWR Facility Manager is J. G. Ayala. The Manager, Regulatory Compliance and EHS is Thomas McConnell.

7.0 CONCLUSION

Northstar Vallecitos hereby provides, on behalf of GE Hitachi Nuclear Energy (the previous Vallecitos Nuclear Center licensee), that the deactivated VBWR continues to be maintained in a safe shutdown condition. The inspections, access control, and administratively controlled activities ensure maximum protection for the public health and safety. Facility procedures will continue to maintain this high level of protection.

GE Hitachi Nuclear Energy Vallecitos Operations Page 2 of 2

NSV 25-012 / Enclosure 1 / Page 4 of 8

_L SURVEYOR REVIEWER BrA'JL ~1/

HITACHI NO.:

D-015 Stuart/Ar1J!!Shf-~

VALLECITOS NUCLEAR CENTER (print)

(sig )

(print)

(sign)

DATE:

8/21/2024 NUCLEAR SAFETY SURVEY RECORD LOCATION VBWR Containment TIME:

8:00

@ Routine REASON Annual Survey Special ITEMS OR LOCATION DOSE RATE DIRECT MEASUREMENT LOOSE CONTAMINATION item p

y n

TOTAL Distance py py a

a py py a

a AREA (mrad/hr)

(mrem/hr)

(mrem/hr)

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INSTRUMENT USED RadEye SERIAL NUMBER 34405 CAL. DUE DATE 11/4/2024 Area Posted: (mark applicable)

RA 0HRA G1cA 0RMA ARA 0

Other:

COMMENTS See attached maps and smear results a Probe:

N/A Efficiency (4n):

10%

13 Probe:

N/A Efficiency (4n):

10%

NSP-3060-F01, NEO 289 (REV. 2/23)

Page of 4

0.044 0

0 NSV 25-012 / Enclosure 1 / Page 5 of 8 VBWR MAIN FLOOR 0

0.051 G)

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0.022 0

Survey No.

Date:

Surveyor(s)

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0 0

0.037 0.026 Map Legend Smear Location Contact Dose Rate in mR/hr All field dose rates in mR/hr

SLANTED WALL NSV 25-012 / Enclosure 1 / Page 6 of 8 Survey No.

D-015 Date:

08/21/24 Surveyor(s)

Stuart H VBWR BASEMENT AREA Arnerich, ~

J Page 3 of 4 p

0.215 7

SLANTED WALL G

SLANTED WALL 0.115 0

0 0.240 0

0 0

Map Legend Smear Location Contact Dose Rate in mR/hr All field dose rates in mR/hr

HITACHI Counting Lab Analysis Report Issue Date: 8/27/2024 To: D. Demore Sample

Description:

19 Disk Smears from VBWR Containment Sample ID: 24SM301 Instrument:

Tennelec XLB System B Analyzed By:

Serial No.:

2972-1 Beta MDA:

Calibration Date:

2/15/2024 Alpha MDA:

Beta Efficiency:

27.57%

Sample Date:

Alpha Efficiency:

34.27%

Count Date:

Alpha v100 cm2)

Location NCPM DPM First Floor 1 0

<MDA First Floor 2 0

<MDA First Floor 3 0

<MDA First Floor 4 0

<MDA First Floor S 0

<MDA First Floor 6 0

<MDA First Floor 7 0

<MDA First Floor 8 0

<MDA First Floor 9 0

<MDA First Floor 10 0

<MDA First Floor 11 0

<MDA Basement 12 0

<MDA Basement 13 0

<MDA Basement 14 0

<MDA Basement 15 0

<MDA Basement 16 1

<MDA Basement 17 0

<MDA Basement 18 3

<MDA Basement 19 0

<MDA

~

Herald Stuart 2024-08-27 15:40-07:00 Signature: _ ________

Attached to Survey D-015, VBWR Annual Survey.

Page 4 of 4 NSV 25-012 / Enclosure 1 / Page 7 of 8 GE Hitachi Vallecitos Nuclear Center Radiological Counting Laboratory H. A. Stuart 23.2 DPM 9.26 DPM 8/21/2024 8/27/2024 Beta (/100 cm2)

NCPM DPM 2

<MDA 4

<MDA 36 130 37 133 11 39 13 46 46 166 12 43 14 so 89 322 34 122 30 108 23 83 52 188 21 75 31 112 29 104 690 2500 45 162

Air Sample Data for VNC Reactor Annual Inspection 2024 NSV 25-012 / Enclosure 1 / Page 8 of 8 At Sample Time After Radon Decay After Radon Decay Reactor Location Date Alpha (uCi/ml) Beta (uCi/ml) Alpha (uCi/ml) Beta (uCi/ml)

Alpha (DAC)

Beta (DAC)

Main Floor 8/14/2024 4.42E-10 1.44E-09 3.75E-14 1.32E-12 0.013 0.001 VBWR Basement 8/21/2024 1.13E-09 3.65E-09 8.44E-14 1.33E-11 0.028 0.007 Fuel Pool 8/14/2024 1.08E-09 3.46E-09 0.00E+00 1.55E-12 0.000 0.001 Main Floor 8/14/2024 8.28E-09 2.87E-08 1.31E-13 2.72E-12 0.044 0.001 EVESR Basement 8/21/2024 4.20E-08 1.13E-07 1.72E-13 4.00E-11 0.057 0.020 519' Level 8/21/2024 2.87E-08 7.56E-08 2.17E-13 2.llE-11 0.072 0.011 Main Floor 8/14/2024 6.39E-10 2.20E-09 3.75E-14 8.51E-13 0.013 0.000 GETR Basement 8/21/2024 2.62E-09 7.38E-09 6.40E-14 2.55E-11 0.021 0.013 Third Floor 8/21/2024 7.99E-10 2.28E-09 2.99E-14 4.18E-12 0.010 0.002

NSV 25-012 Docket Nos. 50-18, 50-183 and 50-70 EVESR Annual Report No. 57 (13 pages excluding this cover sheet)

~

North Star ESADA-VALLECITOS EXPERIMENTAL SUPERHEAT REACTOR (DEACTIVATED)

ANNUAL REPORT NO. 57 FOR THE YEAR 2024 LICENSE DR-10 DOCKET 50-183*

MARCH 2025 NSV 25-012 I Enclosure 2 I Page 1 of 13 Vallecitos Nuclear Center Sunol, California

NSV 25-012 / Enclosure 2 / Page 2 of 13 EVESR Annual Report No. 57 ESADA-Vallecitos Experimental Superheat Reactor (Deactivated)

ANNUAL REPORT NO. 57 GE Hitachi Nuclear Energy (GEH) has maintained the ESADA Vallecitos Experimental Superheat Reactor (EVESR) in a deactivated status under the authority of Amendment No. 7 to License DR-10, Docket 50-183, issued December 1, 2008. In this annual report, a summary of the status of the facility for the period of January 1, 2024, to December 31, 2024, is presented, as required by Amendment 7, Appendix A, Technical Specifications, section C. 1.

1.0

SUMMARY

Entry into the containment building was made for routine radiation surveys, quarterly patrols, annual structural inspections, and a general examination of conditions throughout the building.

In accordance with written procedures, the Facility Manager controls access to the containment building.

Structural conditions and radiation and contamination levels remain at acceptable levels.

Environmental data is maintained on site and available for review.

2.0 STATUS OF FACILITY In accordance with written procedures, the Facility Manager controls access to the containment building and general systems. The facility continues to be in deactivated status. The plugs to the reactor vessel, head storage shield, and the wooden cover over the fuel storage pool remain in place.

3.0 ROUTINE PATROLS The facility was inspected weekly, quarterly, and annually in accordance with written procedures.

The structural condition of the facility remains actively monitored, stable and structurally sound to ensure maximum protection for public health and safety.

4.0 RADIATION AND CONTAMINATION Complete radiation and contamination surveys of the facility indicate that levels remain low.

Results of the surveys are presented in attachment 1. Air sampling results are presented in attachment 2. The radiation/contamination levels listed are representative but not necessarily maximum values.

Analytical results of groundwater samples are available in the Annual Environmental Report submitted on March 5, 2025.

Page 1 of 2

NSV 25-012 / Enclosure 2 / Page 3 of 13 EVESR Annual Report No. 57 5.0 ACTIVITIES Routine patrols and inspections were conducted during this report period.

There were no preventive or corrective maintenance activities performed having safety significance during the reporting period.

6.0 ORGANIZATION The Site Manager is K. Zanotto. The EVESR Facility Manager is J. G. Ayala. The Manager, Regulatory Compliance and EHS is Thomas McConnell.

7.0 CONCLUSION

Northstar Vallecitos hereby provides, on behalf of GE Hitachi Nuclear Energy (the previous Vallecitos Nuclear Center licensee), that the deactivated ESADA-Vallecitos Experimental Superheat Reactor is being maintained in a safe shutdown condition. The inspections, access control, and administratively controlled activities ensure maximum protection for the public health and safety. The procedures will continue to maintain this high level of protection.

GE Hitachi Nuclear Energy Vallecitos Operations 1arw~a~g ~~

Nuclear Center Page 2 of 2

/

NSV 25-012 I Enclosure 2 I Page 4 of 13 SURVEYOR

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REVIEWER HITACHI

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DATE:

8/21/2024 NUCLEAR SAFETY SURVEY RECORD LOCATION EVESR Containment TIME:

9:00 0

Routine REASON Annual Survey O Special ITEMS OR LOCATION DOSE RATE DIRECT MEASUREMENT LOOSE CONTAMINATION Item 1:1 Y

n TOTAL Distance J:ly J:l y ex ex 1:1 'Y 1:1 'Y ex ex AREA (mrad/hr)

(mrem/hr)

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INSTRUMENT USED RadEye 1----------1-- -----+--------+-------+------+------+--------+--------1 SERIAL NUMBER 34405 1--_ _.:;..:..;.:.:;___~------,l......------+-------,l......------1------+--------+--------1 CAL. DUE DATE 11/4/2024 Area Posted: (mark applicable) 0 RA O HRA

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CA 0 RMA O ARA O Other.

COMMENTS See attached maps and smear results a Probe:

N/A Efficiency (4n):

10%

13 Probe:

N/A Efficiency (4n):

10%

NSP-3060-F01, NEO 289 (REV. 2/23}

Page of 9

ESCAPE HATCH EVESR 549 1 LEVEL 0

0 0.023 0

0.018 5

0 0.015 7

EQUIPMENT HATCH NSV 25-0j2 / Enclosure 2_1 e0 a11e 5 of 13 SurveyNo.

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0 Date:

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0.018 e 0

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D-016 Surveyor(s)

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0.026 0.031 NSV 25-012 / Enclosure 2 / Page 10 of 13 EVESR 487' LEVEL 0

0.045 0.175 0.023 Survey No.

Date:

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Map Legend Q Smear Location Q Contact Dose Rate in mR/hr All field dose rates in mR/hr

HITACHI Counting Lab Analysis Report Issue Date: 8/28/2024 To: D. Demore Sample

Description:

45 Disk Smears from EVESR Containment Sample ID: 24SM302 Instrument:

Tennelec XLB System B Analyzed By:

Serial No.:

2972-1 Beta MDA:

Calibration Date:

2/15/2024 Alpha MDA:

Beta Efficiency:

27.57%

Sample Date:

Alpha Efficiency:

34.27%

Count Date:

Alpha VlO0 cm2)

No.

Location NCPM DPM 1

549' Level 0

<MDA 2

549' level 2

<MDA 3

549' Level 0

<MDA 4

549' Level 0

<MDA 5

549' Level 0

<MDA 6

549' Level 1

<MDA 7

549' Level 0

<MDA 8

549' Level 0

<MDA 9

549' level 0

<MDA 10 549' Level 1

<MDA 11 549' Level 1

<MDA 12 549' Level 0

<MDA 13 534' Level 0

<MDA 14 534' level 0

<MDA 15 534' level 0

<MDA 16 534' Level 0

<MDA 17 534' Level 0

<MDA 18 534' Level 0

<MDA 19 534' Level 1

<MDA 20 534' Level 1

<MDA 21 519' level 0

<MDA 22 519' level 1

<MDA 23 519' level 0

<MDA 24 519' Level 0

<MDA Page 8 of 9 NSV 25-012 I Enclosure 2 I Page 11 of 13 GE Hitachi Vallecitos Nuclear Center Radiological Counting Laboratory H. A. Stuart 23.2 DPM 9.26 DPM 8/21/2024 8/27/2024 Beta Vl00 cm2)

NCPM DPM 19 68 54 195 19 68 35 126 4

<MDA 23 83 4

<MDA 2

<MDA 27 97 20 72 12 43 33 119 76 275 1192 4320 100 362 55 199 132 478 100 362 218 790 37 133 88 318 53 191 65 235 48 173

Alpha (/100 cm2}

No.

Location NCPM DPM 25 519' Level 1

<MDA 26 519' Level 0

<MDA 27 503' Level 1

<MDA 28 503' Level 0

<MDA 29 503' Level 0

<MDA 30 503' Level 1

<MDA 31 503' Level 1

<MDA 32 503' Level 1

<MDA 33 503' Level 0

<MDA 34 503' Level 2

<MDA 35 503' Level 1

<MDA 36 503' Level 1

<MDA 37 500' Level 0

<MDA 38 500' Level 0

<MDA 39 500' Level 2

<MDA 40 487' Level 1

<MDA 41 487' Level 0

<MDA 42 487' Level 1

<MDA 43 487' Level 0

<MDA 44 487' Level 4

12 45 487' Level 0

<MDA

~

Signature: _____ _________ _

Herald Stuart 2024-08-28 11 :59-07:00 Attached to Survey D-016, EVESR Annual Survey.

Page9of9 NSV 25-012 / Enclosure 2 I Page 12 of 13 Beta (/100 cm2)

NCPM DPM 52 188 42 151 444 1610 I

152 550 435 1580 69 249 124 449 119 431 96 347 184 667 282 1020 982 3560.

1047 3800 348 1260 108 391 134 485 365 1320 141 511 230 833 303 1100 408 1480

Air Sample Data for VNC Reactor Annual Inspection 2024 NSV 25-012 I Enclosure 2 I Page 13 of 13 At Sample Time After Radon Decay After Radon Decay Reactor Location Date Alpha (uCi/ml) Beta (uCi/ml) Alpha (uCi/ml) Beta (uCi/ml)

Alpha (DAC)

Beta (DAC)

Main Floor 8/14/2024 4.42E-10 1.44E-09 3.75E-14 1.32E-12 0.013 0.001 VBWR Basement 8/21/2024 1.13E-09 3.65E-09 8.44E-14 1.33E-11 0.028 0.007 Fuel Pool 8/14/2024 1.08E-09 3.46E-09 0.00E+00 1.55E-12 0.000 0.001 Main Floor 8/14/2024 8.28E-09 2.87E-08 1.31E-13 2.72E-12 0.044 0.001 EVESR Basement 8/21/2024 4.20E-08 1.13E-07 1.72E-13 4.00E-11 0.057 0.020 519' Level 8/21/2024 2.87E-08 7.56E-08 2.17E-13 2.llE-11 0.072 0.011 Main Floor 8/14/2024 6.39E-10 2.20E-09 3.75E-14 8.51E-13 0.013 0.000 GETR Basement 8/21/2024 2.62E-09 7.38E-09 6.40E-14 2.55E-11 0.021 0.013 Third Floor 8/21/2024 7.99E-10 2.28E-09 2.99E-14 4.18E-12 0.010 0.002

NSV 25-012 Docket Nos. 50-18, 50-183 and 50-70 GETR Annual Report No. 66 (13 pages excluding this cover sheet)

~

North Star GENERAL ELECTRIC TEST REACTOR (DEACTIVATED)

ANNUAL REPORT NO. 66 FOR THE YEAR 2024 LICENSE TR-1 DOCKET 50-70 MARCH 2025 NSV 25-012 I Enclosure 3 I Page 1 of 13 Vallecitos Nuclear Center Sunol, California

GETR Annual Report No. 66 General Electric Test Reactor (Deactivated)

ANNUAL REPORT NO. 66 NSV 25-012 / Enclosure 3 / Page 2 of 1 1

3 GE Hitachi (GEH) has maintained the General Electric Test Reactor (GETR) in a deactivated status under the authority of Amendment No. 17 to License TR-1, Docket 50-70, issued October 22, 2007 as specified in TS 6.6.1 to Amendment No. 14, issued February 5, 1986. In this annual report, a summary of the status ofthe facility for the period of January 1, 2024 to December 31, 2024 is presented.

1.0

SUMMARY

The facility remains in predominately the same condition described in Annual Report No. 64. Entry into the reactor building was made for routine radiation surveys and a general examination of conditions throughout the building. The crane, and ventilation were serviced and tested in 2023 in anticipation of beginning remediation activities.

Such activities have not begun.

Structural conditions and radiation and contamination levels remain at acceptable levels. Environmental data is maintained on site and available for review.

2.0 STATUS OF FACILITY In accordance with written procedures, the Facility Manager controls access to the containment building and general systems. The facility continues to be in deactivated status. There were no changes authorized by the Facility Manager pursuant to 10 CFR 50.59(a) in 2023.

3.0 ROUTINE PATROLS The facility was inspected weekly, quarterly, and annually in accordance with written procedures.

The presence of minimal efflorescence was identified on facility basement walls during the annual inspection. This condition was evaluated and determined to not pose a structural issue.

The structural condition of the facility remains actively monitored, stable and structurally sound to ensure maximum protection for public health and safety.

4.0 RADIATION AND CONTAMINATION Complete radiation and contamination surveys of the facility indicate that levels remain low. Results of the surveys are presented in attachment 1. Air sampling results are Page 1 of 2

NSV 25-012 I Enclosure 3 I Page 3 of 13 GETR Annual Report No. 66 presented in attachment 2. The radiation/contamination levels listed are representative but not necessarily maximum values.

4.1 GETR Stack Although maintenance was performed on the stack in 2023, and the stack was tested, there has been no remediation effort performed for the GETR reactor. The ventilation system is operational, but not currently in use.

Analytical results of groundwater samples can be found in the Annual Environmental Report submitted on March 5, 2025.

5.0 ACTIVITIES Inspection of the installed gauges showed no propagation of concrete cracking.

There were no preventive or corrective maintenance activities performed having safety significance during the reporting period.

6.0 ORGANIZATION The Site Manager is K. Zanotto. The GETR Facility Manager is J.G. Ayala. The Manager, Regulatory Compliance and EHS is Thomas McConnell.

7.0 CONCLUSION

Northstar Vallecitos hereby provides, on behalf of GE Hitachi Nuclear Energy (the previous Vallecitos Nuclear Center licensee), that the deactivated GETR is being maintained in a safe shutdown condition. The inspections, access control, and administratively controlled activities ensure maximum protection for the public health and safety. Facility procedures will continue to maintain this high level of protection.

GE Hitachi Nuclear Energy Vallecitos Operations Page 2 of 2

NSV 25-012 / Enclosure 3 I Page 4 of 13

/

SURVEYOR

~

/Y REVIEWER L,,,u/Y HITACHI Stuartl!'~l-';p-:c NO.:

C-012 VALLECITOS NUCLEAR CENTER (print)

(print)

(sign)

DATE:

8/21/2024 sign NUCLEAR SAFETY SURVEY RECORD LOCATION GETR Containment TIME:

11:00 0

Routine REASON Annual Survey D

Special ITEMS OR LOCATION DOSE RATE DIRECT MEASUREMENT LOOSE CONTAMINATION Item p

y n

TOTAL Distance py py a

a py py a

a AREA (mrad/hr)

(mrem/hr)

(mrem/hr)

(mrem/hr)

(cpm)

(dpm)

(cpm)

(dpm)

(cpm)

(dpm)

(cpm)

(dpm) 1

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INSTRUMENT USED RadEye SERIAL NUMBER 34405 CAL. DUE DATE 11/4/2024 Area Posted: (mark applicable)

ORA QHRA 12] CA 0RMA QARA 0 Other:

COMMENTS See attached maps and smear results a Probe:

N/A Efficiency (4n):

10%

f3 Probe:

N/A Efficiency (4n:):

10%

NSP-3060-F01, NEO 289 (REV. 2/23)

Page of 9

0.026 0

NSV 25-012 / Enclosure 3 / Page 5 of 13 Survey No.

C-012 Surveyor(s)

Stuart, H GETR 3RD FLOOR Date:

~/21/24 Arnerich, M ---r' Page 2 of 9 0

0.103 0

0.223 DRAl~ 0 0

0 0.022 REACTOR CAVITY r-"-------1---, 0.250 17.:\\FUEL qRIDGE 1

0.050 0

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0.037 RAISED PLATFORM AREA 0

0.022 0.028 STEP OFF PAO HIGH CONTAMINATION AREA O*

O*

BOUNOARY GENERAL AREAOOSE RATE CONTACT DOSE RATE SMEAR LOCATION (100cm')

0 0.035 0

GETR 2ND FLOOR EEHS NSV 25-012 / Enclosure 3 I Page 6 of 13 0.105 0.045 Survey No.

C-012 Date:

8~/21/24 Surveyor(s)

Stuart, H Arnerich, M.,..._,,, fl,4---,'

Page 3 of 9 0

MANWAY 0.085 0

0 0

0 0.020 0

0.225 0.026

~

STEPOFFPAD HCA HIGH CONTAMINATION AREA BOUNDARY O*

O*

GENERAL AREA DOSE RATE CONTACT DOSE RATE SMEAR LOCATION (100cm')

(OPEN AREA)

NSV 25-012 / Enclosure 3 / Page 7 of 13 GETR MEZZANINE 0.010 0

0.021 0

0.021 0

STAIRS 0.013 0 Survey No.

Date:

Surveyor(s)

Stuart, H Arnerich, M Page 4 of 9 STEP OFF PAO C-012 *-

_,,.__., (J t&t' I

HCA HIGH CONTAMINATION AREA BOUNDARY GENERALAREADOSE RATE 0

• CONTACT DOSE RATE 0

• SMEAR LOCATION (100cm')

GETR 1ST FLOOR 0

0.800 0

0 0.050 0 STAIRS 0.042 0

0.018 EQUIPMENT HATCH 25 NSV 25-012 / Enclosure 3 / Page 8 of 13 Survey No.

C-012 Date:

~/21/24 Surveyor(s)

Stuart, H Arnerich, M Page S of9 0

0.210 0

0.043 HCA I

0*

• o-

,_.,__, (} ~

I 0.120 STEP OFF PAD HIGH CONTAMINATION AREA BOUNDARY GENERAL AREA DOSE RATE CONTACT DOSE RATE SMEAR LOCATION (100cm2)

GETR BASEMENT 0.500 0

0 0

0.071 0

0.051 NSV 25-012 / Enclosure 3 I Page 9 of 13 Survey No.

C-012 Date:

8~21/24 Surveyor(s)

Stuart, H Arnerich, M Page 6 of 9

---..(q,l....?

I' CYLINDER STORAGE AREA 0.057 0

~

STEP OFF PAD HCA HIGH CONTAMINATION AREA BOUNDARY

-**-. GENERAL AREA DOSE RATE 0. CONTACT DOSE RATE 0

SMEAR LOCATION (100cm')

HITACHI Counting Lab Analysis Report Issue Date: 8/27/2024 To: D. Demore Sample

Description:

19 Disk Smears from GETR Containment Sample ID: 24SM303 Instrument:

Tennelec XLB System B Analyzed By:

Serial No.:

2972-1 Beta MDA:

Calibration Date:

2/15/2024 Alpha MDA:

Beta Efficiency:

27.57%

Sample Date:

Alpha Efficiency:

34.27%

Count Date:

Alpha (/100 cm2)

No.

Location NCPM DPM 1

Basement 0

<MDA 2

Basement 0

<MDA 3

Basement 0

<MDA 4

Basement 0

<MDA 5

Basement 0

<MDA 6

Basement 0

<MDA 7

Basement 1

<MDA 8

Basement 0

<MDA 9

Basement 1

<MDA 10 Basement 1

<MDA 11 Basement 0

<MDA 12 Basement 0

<MDA 13 Basement 0

<MDA 14 Basement 0

<MDA 15 Basement 0

<MDA 16 Basement 0

<MDA 17 Basement 0

<MDA 18 Basement 0

<MDA 19 First Floor 0

<MDA 20 First Floor 0

<MDA 21 First Floor 0

<MDA 22 First Floor 0

<MDA Page 7 of9 NSV 25-012 I Enclosure 3 / Page 10 of 13 GE Hitachi Vallecitos Nuclear Center Radiological Counting Laboratory H. A. Stuart 23.2 DPM 9.26 DPM 8/21/2024 8/27/2024 Beta (/100 cm2)

NCPM DPM 37 133 517 1870 50 180 13 46 54 195 35 126 84 304 30 108 35 126 282 1020 210 761 62 224 45 162 69 249 107 387 285 1030 129 467 348 1260 4

<MDA 17 61 31 112 28 101

NSV 25-012 I Enclosure 3 I Page 11 of 13 Alpha (/100 cm2)

Beta (/100 cm2)

No.

Location NCPM DPM NCPM DPM 23 First Floor 1

<MDA 40 144 24 First Floor 0

<MDA 24 86 25 First Floor 0

<MDA 7

25 26 First Floor 0

<MDA 41 148 27 First Floor 0

<MDA 33 119 28 First Floor 0

<MDA 95 344 29 First Floor 0

<MDA 367 1330 30 First Floor 2

<MDA 276 1000 31 First Floor 0

<MDA 119 431 32 First Floor 0

<MDA 41 148 33 First Floor 0

<MDA 12 43 34 First Floor 0

<MDA 10 3.5 35 Mezzanine 0

<MDA 43 155 36 Mezzanine 0

<MDA 44 159 37 Mezzanine 0

<MDA 29 104 38 Mezzanine 0

<MDA 37 133 39 Mezzanine 1

<MDA 37 133 40 Mezzanine 0

<MDA 45 162 41 Second Floor 2

<MDA 53 191 42 Second Floor 1

<MDA 54 195 43 Second Floor 0

<MDA 55 199 44 Second Floor 5

<MDA 81 293 45 Second Floor 1

<MDA 92 333 46 Second Floor 0

<MDA 40 144 47 Second Floor 1

<MDA 64 231 48 Second Floor 1

<MDA 58 210 49 Second Floor 0

<MDA 65 235 50 Second Floor 0

<MDA 41 148 51 Second Floor 0

<MDA 916 3320 52 Second Floor 1

<MDA 953 3460 53 Third Floor 0

<MDA 97 351 54 Third Floor 1

<MDA 82 297 55 Third Floor 0

<MDA 362 1310 56 Third Floor 1

<MDA 187 677 57 Third Floor 0

<MDA 56 202 58 Third Floor 0

<MDA 140 507 59 Third Floor 0

<MDA 191 692 Page 8 of 9

No.

Location 60 Third Floor 61 Third Floor 62 Third Floor 63 Third Floor 64 Third Floor 65 Third Floor 66 Third Floor 67 Third Floor 68 Third Floor 69 Third Floor 70 Third Floor 71 Third Floor Alpha (/100 cm2)

NCPM 0

1 0 1 0

1 0

1 0

0 0

0 0

Hereld Stuart 2024-08-28 14:27-07:00 DPM

<MDA

<MDA

<MDA

<MDA

<MDA

<MDA

<MDA

<MDA

<MDA

<MDA

<MDA

<MDA Signature: ______________ _

Attached to Survey C-012, GETR Annual Survey.

Page 9 of 9 NSV 25-012 / Enclosure 3 I Page 12 of 13 Beta (/100 cm2)

NCPM DPM 246 891 304 1100 240 870 237 859 1976 7170 312 1130 100 362 2789 10100 1150 4170 86 311 619 2240 909 3300

Air Sample Data for VNC Reactor Annual Inspection 2024 NSV 25-012 / Enclosure 3 / Page 13 of 13 At Sample Time After Radon Decay After Radon Decay Reactor Location Date Alpha (uCi/ml) Beta (uCi/ml) Alpha (uCi/ml) Beta (uCi/ml)

Alpha (DAC)

Beta (DAC)

Main Floor 8/14/2024 4.42E-10 1.44E-09 3.75E-14 1.32E-12 0.013 0.001 VBWR Basement 8/21/2024 1.13E-09 3.65E-09 8.44E-14 1.33E-11 0.028 0.007 Fuel Pool 8/14/2024 1.08E-09 3.46E-09 0.00E+00 1.55E-12 0.000 0.001 Main Floor 8/14/2024 8.28E-09 2.87E-08 1.31E-13 2.72E-12 0.044 0.001 EVESR Basement 8/21/2024 4.20E-08 1.13E-07 1.72E-13 4.00E-11 0.057 0.020 519' Level 8/21/2024 2.87E-08 7.56E-08 2.17E-13 2.llE-11 0.072 0.011 Main Floor 8/14/2024 6.39E-10 2.20E-09 3.75E-14 8.51E-13 0.013 0.000 GETR Basement 8/21/2024 2.62E-09 7.38E-09 6.40E-14 2.55E-11 0.021 0.013 Third Floor 8/21/2024 7.99E-10 2.28E-09 2.99E-14 4.18E-12 0.010 0.002