ML25328A178

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Us Dept of Transportation - Nuclear Ship Savannah, Survey Unit Release Record Survey Unit STR-109 Auxiliary Access Trunk, C-Deck the Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd), a Deck to C Deck
ML25328A178
Person / Time
Site: NS Savannah
Issue date: 11/20/2025
From: Roberson D
US Dept of Transportation, Maritime Admin, Nuclear Ship Support Services
To:
Office of Nuclear Reactor Regulation
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U.S. Department of Transportation Maritime Administration Office of Ship Operations Nuclear Ship Savannah Survey Unit Release Record Survey Unit STR-109 Auxiliary Access Trunk, C-Deck the Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd), A Deck to C Deck Approved:

~

Senior Technical Advisor Prepared by:

Nuclear Ship Support Services, LLC

S.11.1,\\.VAII Techn ica I Sta ff Sun cy Unit Release Record PREPARED BY/ DATE:

PEER REVIEW/ DATE:

DECOMMISSIONING PROGRAM MANAGER REVIEW/ DATE:

INDEPENDENT REVIEW/

DATE:

FSS MANAGER RE IEW / DATE:

LICENSI G COMPLIANCE MANAGER REVIEW/ DATE:

SAFETY RE IEW COMMITTEE SUBMITTED/APPROVED Survey Unit TR-109 D. Roberson Douglas Roberson Digitally signed by D. Roberson Dare* 2075 05 15 J 3-J 3*49 -05'00' Date Pete HO 11 en be Ck Digitally signed by Pete Hollenbeck Date: 2025.05.15 14:33:14 -04'00' Pete Hollenbeck, CHP Soeuth Caleb Soeun Soeuth C. Soeun James Reese, CHP, RRPT James Reese Date Digitally signed by Soeuth Caleb Soeun Date: 2025.05.1 9 10:18:04 -04'00' Date Digitally signed by James Reese, CHP, RRPT Date: 2025.05.20 06:38:06 -07'00' Date Dan *, e I R M *,ha 1

  • 1 k Digitally signed by Daniel R. Mihalik Date: 2025.05.21 07:37:41 -04'00' Daniel Mihalik Date John Osborne LCM John Osborne 5/26/2025 Submitted Digitally signed by: John Osborne LCM DN. CN = John Osborne LCM email =

jmosborne@nsss.llc C = AD Dale: 2025.06.05 12:44:20 -05'00' Date 6/2/2025 Approved Page 2 of33 Auxilliary Access Trunk, C-Deck old Water Chcmistr Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck

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SAVANNAH Technical Staff Survey Unit Release Record TABLE OF CONTENTS

1.

EXECUTIVE

SUMMARY

.................................................................................................... 6

2.

SURVEY UNIT DESCRIPTION.......................................................................................... 6

3.

CLASSIFICATION BASIS................................................................................................... 7

4.

DATA QUALITY OBJECTIVES......................................................................................... 7

5.

SURVEY DESIGN............................................................................................................... 10

6.

SURVEY IMPLEMENTATION......................................................................................... 13

7.

SURVEY RESULTS............................................................................................................. 14

8.

QUALITY CONTROL........................................................................................................ 16

9.

INVESTIGATIONS AND RESULTS................................................................................ 17

10. REMEDIATION AND RESULTS...................................................................................... 17
11. CHANGES FROM THE FINAL STATUS SURVEY PACKAGE................................. 17
12. DATA QUALITY ASSESSMENT (DQA)......................................................................... 17
13. ANOMALIES........................................................................................................................ 17
14. CONCLUSIONS................................................................................................................... 17
15. REFERENCES..................................................................................................................... 18
16. ATTACHMENTS................................................................................................................. 19 Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 3 of32

SAVANNAH Technical Staff Survey Unit Release Record LIST OF TABLES Table 4 Radionuclide Fractions and Normalized Fractions............................................... 8 Table 4 15 mrem/y DCGLs for ROC and Ni-63.................................................................. 8 Table 4 Re-normalized Co-60 and Cs-137 Fractions.......................................................... 9 Table 4 Operational DCGLs................................................................................................ 10 Table 5 STR-109 Systematic Measurement Designations................................................. 11 Table 5 Scanning Coverage................................................................................................. 12 Table 5 Investigation Levels................................................................................................ 12 Table 7 Summary of Systematic, Judgmental, and QC Static Measurements................ 14 Table 7 Basic Statistical Properties of Static Measurement Population.......................... 15 Table 7 Scan Measurement Summary................................................................................ 16 Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 4 of32 7

SAVANNAH Technical Staff Survey Unit Release Record LIST OF ACRONYMS AND ABBREVIATIONS ALARA As Low As Reasonably Achievable DQA Data Quality Assessment DQO Data Quality Objective DCGL Derived Concentration Guideline Level FSS Final Status Survey HSA Historical Site Assessment IC Insignificant Dose Contributors LBGR Lower Bound of the Gray Region LTP License Termination Plan MARAD Maritime Administration MARSSIM Multi-Agency Radiation Survey and Site Investigation Manual MDC Minimum Detectable Concentration MDCR Minimal Detectable Count Rate NSS Nuclear Ship Savannah QC Quality Control RASS Remedial Action Support Survey ROC Radionuclides of Concern SOF Sum-of-Fraction TEDE Total Effective Dose Equivalent UBGR Upper Bound of the Gray Region USNRC United States Nuclear Regulatory Commission Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck 7

Page 5 of32

SAVANNAH Technical Staff Survey Unit Release Record

1.

EXECUTIVE

SUMMARY

This Survey Unit Release Record for survey unit STR-109, Auxiliary Access Trunk, C-Deck the Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd), A Deck to C Deck, has been generated in accordance with Maritime Administration (MARAD) procedure STS-005-035, Preparation of Survey Unit Release Records and FSS Final Reports [1] and satisfies the requirements of Section 5.10 of the Nuclear Ship SAVANNAH (NSS) License Termination Plan, STS-004-003 [2].

A Final Status Survey (FSS) survey package for this survey unit was developed in accordance with MARAD procedure STS-005-030, Preparation of Final Status Survey Packages [3], the NSS License Termination Plan (LTP), and with guidance from NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) [4].

This survey unit has a MARS SIM classification of 1. A survey package was designed based upon the use of the Sign Test as the nonparametric statistical test for compliance. Both the Type I (a) and Type II (~) decision error rates were set at 0.05. As a systematic measurement population, fifteen (15) static beta measurements were acquired from the survey unit. In addition, two judgmental static beta measurements were acquired. Surface scanning was performed on 100% of the accessible total surface area in the survey unit.

The data assessment results for survey unit STR-109 show that the maximum gross activity concentration among systematic and judgmental measurements is equal to 560.85 dpm/100 cm2, which is 1.07% of the operational Derived Concentration Guideline Level (DCGLw) value of 52,300 dpm/100 cm2. Therefore, the null hypothesis of the Sign Test is rejected, and survey unit STR-109 is acceptable for unrestricted release. The mean gross activity concentration among the systematic and judgmental measurements is equal to 458.85 dpm/100 cm2, which is 0.66% of the 15 mrem/y gross activity DCGLw of 69,700 dpm/100 cm2. The mean gross activity concentration is equal to 0.10 mrem/y for the survey unit.

2.

SURVEY UNIT DESCRIPTION STR-109 is an impacted Class 1 survey unit. The Cold-Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd) was utilized for monitoring water chemistry as well as monitoring air from the RC and CV. The auxiliary access trunk was utilized for moving equipment and materials in and out of the lower-level RC. The area was also used for sample/waste storage as part of the Cold-Water Chemistry Lab. The survey unit consists of the internal surfaces of the Auxiliary Access Trunk, the Cold-Water Chemistry Lab and Radiation Monitoring Room, located on Decks A - C. Based upon Computer Aided Design drawings, the deck surface area is approximately 30.32 square meters (30.32 m2); the total surface area, including the bulkheads and overhead, is approximately 192.10 m2; this includes the surfaces above 2 meters. Refer to Attachment 1 of this report for figures and maps depicting survey unit STR-109.

Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 6 of32

SAVANNAH Technical Staff Survey Unit Release Record

3.

CLASSIFICATION BASIS Based on the NSS Historical Site Assessment [HSA] [5], survey unit STR-109, identified as survey unit 205Al in the HSA, was identified as a Class 2 structure survey unit. The HSA did not report any leaks or spills in the Cold-Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd). Historical documents did reveal that adjacent area such as D deck and the Tank Top areas were impacted by typical leaks and spills. Based upon a review of the historical information, the results of the characterization survey data, the 2023 Remedial Action Support Survey (RASS) STR-109-RASS-01-Rev 0, and the completion of a final Survey Unit Classification Worksheet, the correct final classification of survey unit STR-109 met the requirements of Class 1.

4.

DATA QUALITY OBJECTIVES FSS planning and design relies on a properly executed Data Quality Objective (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process is described in the NSS LTP in accordance with MARSSIM. The appropriate design for a given survey was developed using the DQO process as outlined in Appendix D ofMARSSIM.

The DQO process incorporated hypothesis testing and probabilistic sampling distributions to control decision errors during data analysis. Hypothesis testing is a process based on the scientific method that compares a baseline condition to an alternate condition. The baseline condition is technically known as the null hypothesis. Hypothesis testing rests on the premise that the null hypothesis is true, and that sufficient evidence must be provided for rejection. In designing the survey package, the underlying assumption, or null hypothesis was that residual activity in the survey unit exceeded the release criteria. Rejection of the null hypothesis would indicate that residual activity within the survey unit does not exceed the release criteria. Therefore, the survey unit would satisfy the primary objective of the FSS sample plan.

The primary objective of the FSS sample plan is to demonstrate that the level of residual radioactivity in survey unit STR-109 did not exceed the release criteria specified in the L TP and that the potential dose from residual radioactivity is As Low As Reasonably Achievable (ALARA).

MARAD Contractor Report CR-139, Calculations to Support NSS Surface Contamination DCGLs [ 6] established the basis for an initial suite of potential Radionuclides of Concern (ROC) for decommissioning. Insignificant dose contributors (IC) were determined consistent with the guidance contained in Section 3.3 of NUREG-1757, Volume 2, Revision 1, Consolidated Decommissioning Guidance - Characterization, Survey, and Determination of Radiological Criteria [7]. In all analyses, Cs-137 and Co-60 contribute nearly 100% of the total dose. The remaining radionuclides were designated as IC. Because Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 7 of32

SAVANNAH Technical Staff Survey Unit Release Record t

Ni-63 comprises approximately 90% of the total activity, it is accounted for as a surrogate to Co-60. Therefore, the final ROCs for final status surveys are Cs-137 and Co-60surrogate-LTP Chapter 6, Section 6.13 discusses the process used to derive the ROC for the decommissioning of the NSS, including the elimination of insignificant dose contributors from the initial suite. Table 4-1 presents the initial suite of ROC for the decommissioning of the NSS, and the normalized mixture fractions based on the radionuclide mixture.

Table 4-1-Radionuclide Fractions and Normalized Fractions Normalized Sum of Sum of Only Co, Ni Nuclide Fractions Fractions and Cs C-14 3.37E-02 5.61E-03 Co-60 9.78E-02 l.63E-02 l.63E-02 Ni-63 5.40E+00 9.00E-01 9.00E-01 Sr-90 9.22E-06 l.54E-06 Tc-99 l.27E-04 2.llE-05 Ag-108m 8.30E-04 1.38E-04 Cs-137 4.57E-01 7.61E-02 7.61E-02 H-3 1.93E-03 3.21E-04 Fe-55 8.l0E-03 l.35E-03 Am-241 5.79E-07 9.66E-08 Pu-239/240 4.81E-07 8.0lE-08 Totals 6.00E+00 l.00E+00 9.93E-01 Each radionuclide-specific DCGLw is equivalent to the level of residual radioactivity (above background levels) that could, when considered independently, result in a Total Effective Dose Equivalent (TEDE) of 15 mrem/yr to an Average Member of the Critical Group. Table 4-2 presents the 15 mrem/y DCGLw for Co-60, Ni-63 and Cs-137 from Chapter 6 of the L TP.

Table 4 15 mrem/y DCGLs for ROC and Ni-63 Radionuclide DCGLw (dpm/100cm2)

Co-60 2.37E+04 Ni-63 2.53E+08 Cs-137 1.20E+05 Nickel-63 is a Hard-to-Detect (HTD) radionuclide. To account for Ni-63, the Easy-To-Detect (ETD) radionuclide Co-60 will be used as a surrogate.

The surrogate DCGL is computed as:

Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 8 of32

SAVANNAH Technical Staff Survey Unit Release Record DCGL DCGLETD X DCGLHTD surrogate =

(f HTD:ETvXDCGLE'rv)+DCGLHTD Where:

DCGLETD = the DCGL for the easy-to-detect radionuclide DCGLHm = the DCGL for the hard-to-detect radionuclide Equation 1 FHm:ETD the activity ratio of the hard-to-detect radionuclide to the easy-to-detect radionuclide Using the data in Table 4-1, the Ni-63/Co-60 ratio equals 55.3. Solving Equation 1 using the DCGLs for Co-60 and Ni-63 in Table 4-2 and the Ni-63/Co-60 ratio of 55.3 is shown below.

2.53E+08 m/

2 DCGLco-60 surrogate= 2.37E + 04 x C

)

= 2.36E+04 dp 100 cm 55.3 X 2.37£+04 +2.53E+08 A gross activity DCGLw has been established, based on the representative radionuclide mix, as follows:

Where:

n DCGLn Gross Activity DCGLw =

1

= fraction of the total activity contributed by radionuclide n

= the number of radionuclides DCGL for the Radionuclide of Concern (ROC)

Equation 2 Of the three radionuclides, only Co-60 and Cs-137 can be detected by gross activity measurements. The normalized fractions for both radionuclides in Table 4-1 must be re-normalized for use in Equation 2. Table 4-3 presents the re-normalized fractions for each radionuclide.

Table 4-3 -Re-normalized Co-60 and Cs-137 Fractions Normalized Only Co-60 sum of and Cs-137 Nuclide fractions Fractions C-14 5.61E-03 Co-60 l.63E-02 1.63E-02 Ni-63 9.00E-01 Sr-90 1.54E-06 Tc-99 2.llE-05 Ag-108m 1.38E-04 Cs-137 7.61E-02 7.61E-02 H-3 3.21E-04 Fe-55 1.35E-03 Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Re-normalized Fractions 1.76E-01 8.24E-01 Page 9 of32

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SA VANNAH Technical Staff Survey Unit Release Record Nuclide Am-241 Pu-239/240 Totals Normalized Only Co-60 Re-sum of and Cs-137 normalized fractions 9.66E-08 8.0lE-08 l.00E+o0 Fractions Fractions 9.24E-02 l.00E+00

, f --*.

--- trl Solving Equation 2 using the re-normalized Co-60 and Cs-137 fractions and the Co-60 surrogate DCGL is shown below.

1 Gross Activity DCGLw = 1_76E-l 8_24E-l = 6.97E+04 dpm/100 cm2.

2.36E+o4 + 1.20E+os The DCGLs are reduced to a fraction of the 15 mrem/yr dose limit. The reduced DCGLs, or operational DCGLw is then used as the DCGL for the FSS design of the survey unit (investigations levels, etc.). The operational DCGLs are set at 75% of the 15 mrem/y DCGLw. The operational DCGLs are provided in Table 4-4.

Table 4 Operational DCGLs Radionuclide Operational DCGLw (dpm/10 0cm2)

Co-60 1.77E+ 04 Cs-137 9.00E+ 04 Gross Activity 5.23E+ 04 Instrument DQOs included a verification of the ability of the survey instrument to detect the radiation( s) of interest relative to the operational DCGLw. Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments was required to ensure the quality and prevent the loss of data. MARS SIM states that a Minimum Detectable Concentration (MDC) below 10%

of the DCGL is preferable and up to 50% is acceptable. Because the background is low on the NSS, the MDC for most static and scan measurements were less than 10% of the DCGL and in all cases the MDCs were less than 50% of the DCGL.

5.

SURVEY DESIGN The LTP specifies that the Sign Test will be used as the nonparametric statistical test for compliance with the release criteria. The number of measurements for use with the Sign Test was determined in accordance with MARAD procedure STS-005-031, Calculation Of The Number of Measurements For Final Status Surveys. [8] The relative shift (!!Jcr) for the survey unit data set is defined as shift(~), which is the Upper Boundary of the Gray Region (UBGR), or the operational DCGLw, minus the Lower Bound of the Gray Region (LBGR),

Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 10 of32

SAVANNAH Technical Staff Survey Unit Release Record divided by sigma ( cr ), which is the standard deviation of the data set used for survey design.

The optimal value for t:Jcr should range between one (1) and three (3). The largest value the ll/cr can have is three (3). If the ll/cr exceeds three (3), then the value of two (2) will be used for t:Jcr.

Remediation and RASS surveys were performed between 10/16/2023 and 12/12/2023. A total of sixty-four (64) static measurements and 64 smears were collected. Post decontamination, no smears had alpha activity greater than the minimum detectable activity. The maximum beta activity was 64.348 dpm/100 cm2. The average total surface activity concentration and standard deviation of all static the measurements were 1,095 and 194 dpm/100 cm2, respectively. Because the activity concentration is low, the LBGR was set to half the operational DCGLw. The relative shift for survey unit STR-109 is based upon the RASS survey results and was calculated as follows:

52,300-26,150 Relative Shift=-----= 135.08 194 Because the calculated relative shift was greater than three (3), the value of two (2) was used as the adjusted t:Jcr. Both the Type I error, or a value, and the Type II error, or p value, was set at 0.05. The sample size from Table 5.5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign Test is an N value of fifteen (15). Fifteen (15) total systematic measurements were used in the survey design for survey unit STR-109.

The survey unit was designated Class 1; therefore, the measurement locations were selected based on a systematic grid with a random starting point. The systematic locations of the static measurements were selected using Visual Sample Plan (VSP). Input parameters included the use of survey unit drawings, and the systematic sampling tool set with a predetermined number of measurement locations. The systematic measurement locations were identified in the field using dimension parameters provided on the survey unit map (see Attachment 1). Table 5-1 lists the systematic measurements to be collected for FSS of survey unit STR-109.

Table 5-l -STR-109 Systematic Measurement Designations Label LX(m)

LY(m)

STR-109-01 1.29 3.78 STR-109-02 1.29 9.71 STR-109-03 1.05 5.27 STR-109-04 1.05 11.20 STR-109-05 1.75 0.97 STR-109-06 5.17 0.97 STR-109-07 8.59 0.97 STR-109-08 12.01 0.97 Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.} A Deck to C Deck Surface Deck Deck Overhead Overhead Bulkhead 3 Bulkhead 3 Bulkhead 3 Bulkhead 3 Page 11 of32

SAVANNAHTec hnical Staff

- -~ ir Survey Unit Re lease Record Label LX m LYm Surface STR-109-09 2.18 0.97 Bulkhead4 STR-109-10 3.31 0.97 Bulkhead 1 STR-109-11 6.74 0.97 Bulkhead 1 STR-109-12 10.16 0.97 Bulkhead 1 STR-109-13 0.32 0.97 Bulkhead2 STR-109-14 1.58 2.81 Bulkhead2 Access Trunk STR-109-15 0.81 2.81 Bulkhead4 Access Trunk The implementation of quality control (QC) measures is referenced in LTP Chapter 5, Section 5.11. A randomly chosen replicate measurement was specified in the survey package. This measurement was to be collected by either a different technician or by a different instrument. Location STR-109-12 was chosen for the replicate measurement. In addition, the survey package also specified to perform QC operability checks of field mstruments both prior to and after collection of the measurements.

The survey package also specified collection of two judgmental measurements to augment the systematic measurements. The locations of these two measurements were to be determined by the technicians and/or the field supervisor. Those two judgmental measurements are identified as STR-109-16-J and STR-109-17-J. Those locations would be documented on the field forms.

For this Class 1 structure survey unit, the "Scanning Coverage" are those levels specified in LTP Chapter 5, Table 5-3, and are reproduced below in Table 5-2.

Table 5 Scanning Coverage Classification Required Scanning Coverage Fraction Class 1 100%

For survey unit STR-109, eleven scan areas were established SA-01 through SA-11. The survey package stated to scan 100% of the accessible area in each scan area. Refer to for figures and maps depicting the measurement and scan locations in survey unit STR-109.

For this Class 1 structure survey unit, the "Investigation Levels" for direct and scanning measurement results are those levels specified in LTP Chapter 5, Table 5-2, and are reproduced below in Table 5-3.

Survey Unit Classification Class 1 Survey Unit STR-109 Table 5 Investigation Levels Fixed Measurements Scan Measurements

> Operational DCGLw and an outlier*

> Operational DCGLw Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 12 of32

SAVANNAH Technical Staff Survey Unit Release Record These investigation levels were specified in the survey package.

An additional action level was specified in the survey package. If the technician observed a count rate of2,500 cpm when scanning, approximately one-half of the investigation level, they were to stop scanning, backup and rescan the elevated location again to see if the count rate was observed again. If observed again, an additional static measurement would be collected. If not, they would continue scanning.

6.

SURVEYIMPLEMENTATION For survey unit STR-109, compliance with the unrestricted release criteria was demonstrated through a combination of surface scanning and surface static measurements with a Ludlum Model 43-93 ZnS detector connected to a Ludlum Model 3002 meter operating in the beta mode. Surface scans were also performed utilizing the Ludlum 43-37 large area gas proportional detector connected to a Ludlum 3002 operating in the beta mode.

Prior to performing the survey, a walkdown of the survey unit was performed per MARAD procedure STS-005-032, Survey Unit Turnover and Control. [9] No conditions prohibited the proper collection of static and scan measurements.

FSS field activities were conducted under the approved FSS Package Number NSS-FSSP-STR-109-00-00, which included DQOs, survey design, detailed FSS instructions, survey maps and survey forms. FSS field activities were projected to take six (6) working days to complete. A daily briefing was conducted to discuss the expectations for job performance and to review safety aspects of the job. An FSS package "Field Log" was used to document field activities and other information pertaining to the performance of the FSS. The FSS field activities took six days to complete and was performed on August 14, 2024, through August 15, 2024, August 19, 2024, August 21, 2024, through August 22, 2024, and August 26, 2024. One additional day was spent performing verification scan surveys on October 28, 2024, following the removal of a legacy impacted system SYS-106 (Hydrogen Addition System) which transitioned through the area.

Ambient background count rates were collected by taking a I-minute static measurement, while maintaining the detector waist high. This value was used to calculate the MDC for scanning and static measurements.

The fifteen (15) systematic static measurement locations were marked based on the dimensions provided on the survey map. Two (2) judgmental measurement locations were selected and marked as per the sample plan. A I-minute static measurement was acquired at each location with the detector in contact with the surface.

The eleven scan areas, SA-01 through SA-11, were scanned, resulting in 100% of the total accessible surface area being scanned. The total scan area meets the scan coverage requirements for a Class 1 area as shown in LTP Table 5-3 and reproduced in Table 5-2 of Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 13 of32

SA v A.NNA.H Technical Staff Survey Unit Release Record this release record. Scanning was performed with the detector held approximately 0.75 inches from the surface while moving at a speed of one detector width per second.

Additional scanning was performed in areas SA-04 labeled SA-04-01, SA-04-02, SA 03, and SA-04-04 and SA-01 labeled SA-01-01 following the removal of pipes from the hydrogen addition system and grouting of the remaining lines.

The implementation of survey specific QC measures included the collection of one replicate static measurement. The random location of the replicate measurement was STR-109-12 and identified as STR-109-12-D. That measurement was collected with a different instrument but the same make and model used for all the other measurements.

The instruments used for this survey were satisfactorily checked prior to and after performing the survey.

7.

SURVEY RESULTS The efficiencies used to convert count rates to activity are weighted efficiencies in which the Tc-99 (Co-60 surrogate) and Cs-137 efficiencies are weighted by the fraction Co-60 and Cs-137 comprise the NSS fingerprint. This is documented in CR-164 [10]. For example, if the 4n contact Tc-99 efficiency is 0.1002 c/d and the 4n Cs-137 contact efficiency is 0.1868 c/d, the weighted contact efficiency is shown below.

Weighted efficiency (c/d) = (0.1002) (0.176) + (0.1868) (0.824) = 0.1716 c/d Copies of the instrument calibration records are presented in Attachment 2.

The highest ambient background count rate from a I-minute count was 102 cpm and was rounded up to 125 cpm. The un-painted surface contact detector weighted efficiency is equal to 0.1747 c/d. Using LTP Equation 5-6, which was derived from NUREG-1507, in which the count time and background count times are equal, results in an MDC for 1-minute static measurement equal to 314.8 dpm/100 cm2

  • The value for un-painted flat surface contact is less than 1 % of the operational and gross activity DCGLw. Table 7-1 presents the activity concentration for all static measurements.

Table 7 Summary of Systematic, Judgmental, and QC Static Measurements Activity Concentration Measurement ID (dpm/100 cm2)

STR-109-01 549.40 STR-109-02 440.67 STR-109-03 560.85 STR-109-04 417.78 STR-109-05 406.33 STR-109-06 417.78 STR-109-07 497.90 STR-109-08 389.16 Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 14 of 32

SA VANNAH Technical Staff Survey Unit Release Record Measurement ID STR-109-09 STR-109-10 STR-109-11 STR-109-12 STR-109-13 STR-109-14 STR-109-15 STR-109-16-J STR-109-17-J STR-109-12-D Activity Concentration (dpm/100 cm2) 417.78 492.17 371.99 354.82 383.44 520.79 543.68 532.23 503.62 653.64 The raw static data with detector efficiencies are presented in Attachment 3.

Table 7-2 presents the basic statistical properties of the static measurement population, without the duplicate measurement.

Table 7 Basic Statistical Properties of Static Measurement Population Parameter Value Units Minimum Measurement 354.82 dpm/100 cm2 Maximum Measurement 560.85 dpm/100 cm2 Mean 458.85 dpm/100 cm2 Median 440.67 dpm/100 cm2 Standard Deviation 69.25 dpm/100 cm2 Coefficient of Variation 0.15 unitless Residual activity dose rate 0.10 mrem/y The mean activity from static measurements was divided by the gross activity DCGLw to derive a mean fraction. The mean fraction was then multiplied by 15 mrem/yr to derive the dose attributed to the survey unit. For survey unit STR-109, the calculated dose from residual activity is 0.10 mrem/yr.

Calculation of the scan MDC uses LTP Equation 5-8, derived from NUREG-1507. The scan MDC for the Ludlum 43-37 detector used the highest rounded count rate of 350 cpm, a distance of 0.75 inches, and the un-painted flat surface detector weighted efficiency of 0.1297 c/d. The elevated area is an assumed 100 cm2 circular source. The detector width is 6.25 inches, and the detector speed is 6.25 in/second. With these parameters, the resulting observation interval is 0.711 seconds. The resulting MDC for scanning un-painted flat surfaces is 442.6 dpm/100 cm2. The value is less than 1 % of the operational and gross activity DCGLw.

Calculation of the scan MDC for the Ludlum 43-93 detector used the rounded count rate of 125 cpm, a distance of 0.75 inches, with the un-painted flat surface detector weighted efficiency of 0.1244 c/d, and the grating surface detector weighted efficiency of 0.0422 Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 15 of32 J

SAVANNAH Technical Staff Survey Unit Release Record c/d. The detector width is 3.6 inches, and the detector speed is 3.6 in/second. With these parameters, the resulting observation interval is 1.234 seconds. The resulting MDC for scanning un-painted surfaces is 1,223.0 dpm/100 cm2, and the MDC for scanning gratings is 3,603.65 dpm/100 cm2. The respective values are 2.3% of the operational DCGLw and 1.8% of the gross activity DCGLw for flat surfaces and 6.9% of the operational DCGLw and 5.2% of the gross activity DCGLw for grating surfaces.

Table 7-3 presents activity concentrations for all scan measurements.

Table 7 Scan Measurement Summary Low to High Range Average Scan ID

{dpm/100 cm2)

{dpm/100 cm2)

SA-01 316.91 -4738.53 2527.72 SA-01-01 699.55 - 1254.36 976.96 SA-02 466.36 - 1326. 72 896.54 SA-03 241.22 - 1029.22 635.22 SA-04 265.34 - 1326.72 796.03 SA-04-01 651.30 - 997.05 824.18 SA-04-02 273.39 - 948.81 611.10 SA-04-03 273.39 - 779.95 526.67 SA-04-04 498.53 - 884.48 691.51 SA-05 184.94 - 1029.22 607.08 SA-06 257.30 - 1487.54 872.42 SA-07 273.39 - 1366.93 820.16 SA-08 225.14 - 1149.83 687.49 SA-09 321.63 -1117.67 719.65 SA-10 241.22 - 1230.24 735.73 SA-11 305.55 - 1005.09 655.32 The raw scan data with detector efficiencies are presented in Attachment 3.

8.

QUALITY CONTROL The implementation of survey specific QC measures included the collection of one replicate static measurement {STR-109-12-D) for analysis. The acceptance criteria for replicate static measurements is defined by NUREG-1576, MARLAP volume 1, Appendix C, Section C.4.2.2 Duplicate Analyses [11]. That section states that when the average of the two measurements is less than the UBGR, the control limit for the absolute difference between the two values is 4.24µMR. The value for µMR is equal to the shift divided by 10.

The shift is equal to the operational DCGLw, minus one half the operational DCGLw, or 26,150 dpm/100 cm2. Therefore, the control limit is equal to 11,087.6 dpm/100 cm2, as shown below.

Control limit= 26,150/10*4.24 = 11,087.6 dpm/100 cm2.

Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 16 of32

SAVANNAH Technical Staff Survey Unit Release Record The results of the evaluation of the quality control measurement shows agreement between the original and duplicate measurements. See Attachment 4 for the results.

9.

INVESTIGATIONS AND RESULTS No investigation levels were triggered, and no investigations were performed as the result of the analysis of the collected data.

10.

REMEDIATION AND RESULTS No radiological remedial action was performed in this survey unit as a result of the FSS.

11.

CHANGES FROM THE FINAL STATUS SURVEY PACKAGE There were no addendums to the FSS package which was developed in accordance with STS-005-030, Preparation of Final Status Survey Packages [3].

12.

DATA QUALITY ASSESSMENT (DQA)

The DQO sample design and data were reviewed in accordance with MARAD procedure STS-005-033, Final Status Survey Data Assessment and Investigation [12] for completeness and consistency. Documentation was complete and legible. Scan surveys and the collection of static measurements were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class 1.

The preliminary data review consisted of calculating basic statistical quantities ( e.g., mean, median, standard deviation). The mean and median values of the data were well below the operational DCGLw. The survey unit data is presented graphically in a frequency plot and quantile plot presented in Attachment 6.

Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements exceed the DCGL, the test was conducted to demonstrate coherence to the statistical principles of the DQO process. The Sign Test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign Test results clearly demonstrates that the survey unit passes the unrestricted release criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment 5.

13.

ANOMALIES No anomalies were observed during the performance of the survey.

14.

CONCLUSIONS Survey unit STR-109 has met the DQOs of the FSS package. The survey unit is properly classified as Class 1.

The sample data passed the Sign Test. The null hypothesis was rejected. Therefore, the Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 17 of32

SA VANNAH Technical Staff Survey Unit Release Record survey unit meets the release criteria.

The dose contribution from residual activity in survey unit STR-109 is 0.10 mrem/yr TEDE, based on the mean activity of measurements used for non-parametric statistical sampling.

Survey unit STR-109 is acceptable for unrestricted release.

15.

REFERENCES

[1] "STS-005-035, Preparation of Survey Unit Release Records and FSS Final Reports".

[2] "STS-004-003, N.S. Savannah License Termination Plan".

[3] "STS-005-030, Preparation of Final Status Survey Packages".

[4] "NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM), Revision 1, August 2000".

[5] "CR-003, STS-109, Historical Site Assessment, 2008".

[6] "CR-139, TSD 21-089, Calculations to Support NSS Surface Contamination DCGLs, Rev 01, September 2022".

[7] "NUREG-1757, Vol 2, Rev 1, Characterization, Survey, and Determination of Radiological Criteria".

[8] "STS-005-031, Calculation of The Number of Measurements For Final Status Surveys".

[9] "STS-005-032, Survey Unit Turnover and Control".

[10] "CR-164, TSD 23-126, "Calculation of Weighted Efficiencies and MDCs of Ludlum Detectors for Final Status Surveys on the NS Savannah", Rev 0 l ".

[11] "NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual, MARLAP, July 2004".

[12] "STS-005-033, Final Status Survey Data Assessment and Investigation".

Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 18 of32

SAVANNAH Technical Staff Survey Unit Release Record

16.

ATTACHMENTS - Figures and Maps - Calibration Records - Static and Scan Data - Quality Control Assessment - Sign Test - Graphical Presentations Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 19 of32

SAVANNA/I Technical Staff Survey Unit Release Record - Figures and Maps 3 - --- d

& rt Location of the Auxiliary Access Trunk, C-Deck the Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd), A Deck to C Deck Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 20 of32

SAVANNA/I Technical Staff Survey Unit Release Record Auxiliary Access Trunk, C-Deck the Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd), A Deck to C Deck Systematic and Judgmental Static Locations 8

~*

1~ t.

-$'Tl!'

Till,~

~

Tll1 Cl

--q.1c

~-1 11

~

l"'l-1~

~

-q_,,,9-1

~-!CH"

~

.,,1 o, TR*I

,o

. *1CIHl3

,$- ~-,~17-J

id1a1 n

n1tonng Roo LEGEND:

Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck NOTES:

Access Trunk B Dec to Prom Deck

.j1' El

  • 59' El.

VSP Origin Point in Ship Coordinates:

Frame 102 14' 6" Starboard of Centerline 32'0" above baseline BOW

  • SMIPLE LOCATIONS CREATED IN VISUAL SAI\\IPLE PLAN N ~-1 ER OF M.1PLE 15 PLACEMENT ETHOD SYSTH IATIC 0

2 4

TART LOC RANDOM I E3 I

I Meters Page 21 of32

SA VANNA// Technical Staff Survey Unit Release Record Auxiliary Access Trunk, C-Deck the Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd), A Deck to C Deck Scan Areas 3

0 Jt Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck 0

2 I E3 etSi Page 22 of32

S1rANNAJJ Technical Staff Survey Unit Release Record l - Calibration Records C~llbf,nion cen1t1c.:ite - ID Number: 250J5112000 - 20240606 - o RSCS Customer: Scott G111te1 RJ JIIOO Sal

\\ Coo'rol SeMC s Inc 93 Ledge Road Seabrook NH 03874 Testl I

Tes12 I

5.00 kcpm I

4.99 kcpm I

R, tVa Instrument LU<lum I I 3002 Probe Model Luo~m43-93 Precision Check Test3 I

I.lean 4.99 kepm I

4.99 kepm Accuracy Check As Fouoo As L M AUTO 500 Kcpm =

500Kcpm/t 500 Kcpm.ti AUTO 50 Kcpm =

50 Kcpm II 50 Ktpmli AUTO Kcpmil 5 Kcpmll 5 Kcpm*

AUTO 05K 0 499 Kc "

OJ 9K "

Reaa1ngs w1tn

  • ln<l ~:e ranges...neie As-Founa reaa,ngs are >2D'!I. or Target value R aa,ngs with.. 1ndlcat P As-I<- rea ngs ar I~

Target lue Readings w1tll = 1101ca:e ranges were cahbrated usmg a putser sen~! Number 25035112 Serl~I Number J21J17 I

Resuns I

P~ss Sour ID Pulser 98756 PUiser 98756 Put<er 98756 Pu!sef 'lll751i Prob*

Isotope Efficiency NIST Source ID GeonMtry ComrTMnt 43-93 421 -1 17 CS-137(8etat 93 421417 Tc-99

<;'U21Jl7 Tc-99 4J-:f.3 J21J 17 CS-137(8eta 43-93 1214 7 Cs 1371Beta 43-93 J214 17 Tc-99 43-3 -121-1 7 TC-99 43-93 42 lJ 17 Cs 137(8 ta)

Top T

  • Pa ud10 FLflCIJOO Che Pass Custaner Equ pmen ID 0 1901 CID (4 P1J 7357 Cs-I 37t8eta) 0 1028 CID (4 Pt) 127351' Tc-99 00699 0(4 P1) 12n'ili Tc-"9 0 360 CID (J Pt) 1 7357 CS-137(8eta) 00167 CID (4 Po 127357 Cs 137<8eta) 0 0076 CID 14 Po 127 56 Tc-99 0 0056 CID (4 Pl) 1273',6 Tc-~

0 0152 CID (4 Pl) 127357 CS* 137tBelil) ac Re vie By 1\\-la, Hunter

"<! IT; RSC$ a 9lLe<JQ,< Rd as 11.lncbrG unct-

'I of 3SU!'

Flat SUrlace On Contact F t surtace On Cont.,ct F11t Suffice

'.'o/4 Move.

irce F I Surtace

Y-1 Al>Ove source Flat Surface OnGr.i:

Fl t SUrlace OnGra:e tSur1Jce F t Sulf,1 e As Found As Left 7().1 Volts 7

Volts Date JUn 06. 20 4 Exp.res* Jun 06. 2025 QC Date J\\11 06.

24

/Of theme" n1 The res, l"lT Trxe,hl 1<>1rc~

~ t.uent111 SI N32lA.B-RSCS Rad I 2 fpj Survey Unit STR-109 Page 23 of32 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck

S1 v ANNAi 1 Technical Staff Survey Unit Release Record C-lllbr:itlon Ctnlflc.iie - 10 Number: 25035118000 - 20240606 -o RSCS customer:

  • r Rn..:ihon f

Control Services In 93 Ledge Road Seabrook NH 03874 Instrument Lud m.1odel 3002 Probt Model Ludlum 43-37 Precision Check Stn:il Number 250351 18 Sen:il Number 281 3

Tes11 I

Test2 I

Test3 I

Mean I

Results

.-.99 kcpm I

5.01 kcpm I

5.00 kcpm I

Accuracy Check Ranoe TaroetValue As Found AUTO 500 Kcpm#

500Kcpm,t AUTO 50Kcpm#

.\\99Kcpm" AUTO 5 Kcpm#

4 99Kcpm" AUTO 0 5 Kcpm #

0501 Kcpmlr Read ngs with

  • lnd,cate ronges v.nere As-Found readings are *20% of Ti rget value ReadJ!l9S w1tn ** indicate As-le reao ngs are > 1Cl% of Target vaiue Read s *, 1 II tndlc.i; rang
v. re c.il1brated USU'9 a pulser Probe Isotope Efficiency NIST Source 10 37 281043 Tc-99 0 1071 0(4 Pt) 1 7356 Tc-99 5.00 kcpm I

P:iss As Len S<xa"ce ID 500Kcpm#

PUiser 98756 499 Kcpm" PUiser 98 7 56 4 99Kcpm It PUiser 98756 0.501 Kcom#

Pulser 98756 Geometry Comment bt Surface 3'4" Above Source 43-37 2810.\\3 Cs 137(Beta) o 13-15 D(4PI) 127357 cs 137(Beta)

Fl.It Surface 314" Above Source 43-37 281043 Tc-99 43-37 2810.\\3 Cs-137(Bela) 43-37 281043 Tc-99 43 37 281043 Cs 137(Be )

43-37 281043 Tc-99 37 2810.\\3 Cs-137(Beta)

Ph slc:il Checks outer P~ slCal Check Pass TapTes Pass Aud Foocuon c COrd check Pass Cahbratoo Date Set Pass s

0 0073 D (4PI) 127356 Tc-99 0 0121 OD(.\\ Pt) 127357 Cs-137\\Beta) 0 15-14 0(4 Pt) 127356 Tc-99 o 1151 0(4 Pl) 127357 Cs l371B 00113 0 (4 Pl) 127356 Tc-99 00 1360D(4Pr) 127357 Cs-137\\BetaJ Electronics Checks Commen s Effl encres performed us,ng 1 5" fiberglass grate as requested Cu omer Equ pmen ID Gallbraled By N COie

!Vedog QC Rev1e1 B Matthew H nt r ra:ure 71 o 'F '-umtdrty 52 O 1-,, 8.lromemc Pressure 29 62 l 1111? WI n.i;ec1f.d h :, ~.u, rio b1 unte by scs 31 &3 Ledge Rd Se DOis NH Survey Unit STR-109

  • ,on, pe-tom,,,d 11 conlom>Jnce 10 RS S

,1,, lion se ce* are CSL 25-10-1-1 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck un<:

lcno Fl.It SurfJCe 314" AbOve Grate Flat SurfJce 3,4* Above Grate F t Surface on source F t Surf.ice on Source Flat Surface OnGra e Flat Surf.ice On Grate As Found As Left 1751 Vols 1800Vo11s Da:e Jun 06. 2024 Explfes Jun 06. 20 5 QC Date Jun 06. 2024 I., 01 IOv..ng NIST Tr.ice31lle sources loo,oac*,e nual and I 2 Page24 of32

S1YANNA11 Technical Staff Survey Unit Release Record Calibration Certificate* ID Number: 25035132000. 20240305. 1 RSCS customer: Matthe"' G Hunter Radlatlon Safety & Control Services Inc 93 Ledge Road Seabrook NH 03874 Instrument Ludlum Model 3002 P'robe Model Ludlum 43-93 Serial Number 25035132 Serial Number 421425 Precision Check Test1 I

Test2 I

Test3 I

Mean I

Results 5.00 kcpm I

4.99 kcpm I

4.99 kcpm I

4.99 kcpm I

P'ass Accuracy Check Range Target Value As Found As lelt Source ID AUTO 500 Kcpm #

499 Kcpm r, 499 Kcpm #

Pulser 98756 AUTO 50 Kcpm#

50 KcpmF 50 Kcpm #

Pulser 98756 AUTO 5 Kcpm i:

5 Kcpmr, 5 Kcpm;;

Pulser 98756 AUTO 0.5 Kcpm;;

0.498 Kcpm F o 498 Kcpm;;

Pulser 98756 Readings with

  • Indicate ranges where As-Found readings are >20% ofTarget value Readings w,th " Indicate As-left readings are >10% of Target value.

Readings with # Indicate ranges "'ere calibrated using a pulser Probe Isotope 43-93 421425 Tc-99 43-93 421425 Cs-137(Beta) 43-93 42 1425 Cs-137(Beta) 43-93 42 1425 Tc-99 43.93 421425 Cs-137(Beta) 43-93 421425 Tc-99 43-93 421425 Cs-137(Beta) 43-93 421425 Tc-99 Light Check of SclntJlatlon Probes Pass Outer Physical Check Pass Tep Test Pess Audio Function Check Pass Cord check: Pass Calibration Date Set. Pass Efficiency 0.0243 C/D (4 Pl) 0.0505 CID (4 Pi) 0 0398 CID (4 P1 )

0 0177 C/D (4 Pl) 0 1620 C,D (4 Pl) 0 1108 CID (4 Pl) 01193 CID (4 Pl) 0.0821 C/0 (4 Pl)

Comments* Calibrated with 20* C to C cable Customer Equipment ID NIST source ID 127356 Tc-99 127357 Cs-137(Beta) 127357 Cs-137(Beta) 127356 Tc-99 127357 Cs-1 37(Beta) 127356 Tc-99 127357 Cs-137(Beta) 127356 Tc-99 Calibrated By Nicole Wedlg QC Review By Ma aw Hunter Atmos cJ,u Hun11J1ty O

  • 1omcu,c Pr

.,. 30 211111'1lg Geometry Flat Surface Flat Surface Flat Surface Flat Surface Flat Surface Flat Surface Flat Surface Fiat Surface As Found 678 Volts comment On Grate On Grete 3/4" Above Grate 314' Above Grate On Contact On Contact 314" Above Source 314" Above Source As Left 780 Volts Date Mar 05. 2024 Expires Mar 05. 2025 QC Date Mar 05, 2024 IlJot foll ng wnhm spuclfi lurnt V11:.h no,

uchon by uncortomty or lhe n ;i::;u10, ~*

Unless othcr\\'/150 Sia fomlOd by RSCS 193 Lodge R SeoL<ook, NH utollllll!I U,e roJowmg NIST Trucoob sourcos Pu!

r 98756 (Cal Due Ocl 3 1 20 4)

Wor"8d on w ilblouon N,cole Wedlo The reponec:1 expand uncerti'.1111ty of measurament 1s stalec:1 os the standard uncenmntv 01 measuremem multlpbed by Illa coveralll' factor such that lhA covemg probaMiy rorm,;po 10 opproxrma ly 115°'

Unless oinerwise Slated c,braoons penormed,n confoonance 10 Ille lollow,ng documents ANSI N323AB-20 13 RSCS New I ID!llpshlre R81:11ooct!V8 Malena! Lr nse Ntmber 38tR RSC lbnlllOO <;f'r.rrn, DI!' pPrtnrrned r, 0C(Old>ll(e \\Vllh lhP R S Rodanrton f-'ro*ecnnn Pmgmm f\\1anuol and Standard Opem1,ng Procoour S.1-'!,, & C r: uo.a llto.>a. *.:.t

!Z$.41)

)) -' '

n,.

I 1 bd Survey Unit STR-109 Page25 of32 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck

S1vANNAJ1 Technical Staff Survey Unit Release Record 1 - - --

Calibration Certlllcate - ID Number: 25017651000. 20240305 -1 RSCS Customer: Matthew G Hunter Radiation Safety & Control Services Inc.

93 Ledge Road Seabrook NH 03874 Instrument Ludlum Modal 3002 Probe Model Lud um 43-93 Serial Number 25017651 Serial Number 312635 Precision Check Test1 I

Test2 I

Test3 I

Mean I

Resu*ts 5.00 kcpm I

5.01 kcpm I

5.00 kcpm I

5.00 kcpm I

Pass Accuracy Check Range Target Value As Found As Left Source ID AUTO 500 Kcpm #

500 Kcpm #

500 Kcpm #

Pulser 98756 AUTO 50 Kcpm #

49.9 Kcpm #

49 9 Kcpm #

Pulser 98756 AUTO 5 Kcpm #

5 Kcpmlf AUTO 0.5 Kcpm #

0 5 Kcpm 11 Readings With

  • Indicate ranges where As-Found readings are >20'll. ofTarget value.

Readings with ** Indicate As-left readings are >10% ofTarget value.

Readings With # Indicate ranges were cahbrated using a pulser Probe Isotope 43.93 312635 Tc-99 43.93 312635 Cs-137(Beta) 4 3-93 312635 Cs-137(Beta) 43.93 312635 Tc-99 43-93 312635 Cs-137(Beta) 43-93 312635 Tc-99 43-93 312635 Cs-137(Beta) 43-93 312635 Tc-99 Physical Checks Light Check of Scintila on Probes: Pass Outer Physical Check: Pass Tap Test Pass Audio Function Check: Pass Comments:

customer Equipment ID Calibrated By Nicole Wedlg Efficiency NIST Source ID 0.0249 CID (4 Pi) 127356 Tc-99 0.0546 CID (4 Pl) 127357 Cs-137(Beta) 0.0471 CID (4 Pl) 127357 Cs-137(Beta) 0.0193 CID (4 Pl) 127356 Tc-99

0. 1693 CID (4 Pl) 127357 Cs-137(Beta) 0.0876 CID (4 Pl) 127356 Tc-99 0.1 237 CID (4 Pi) 127357 Cs-137(Beta) 0.0537 CID (4 Pl) 127356 Tc-99 Electronics Checks High Voltage QC Review By Mattnew Hunter Atmospllc1oc Conil11Klo1*
  • Ten r *ui 71 1 F Hum,doty 'l6 0 B,01111*' K Pr r '.10 2'1 *11,g 5 Kcpm#

Pulser 98756 0 5 Kcpm #

Pulser 98756 Geometry Comment Flat Surface On Grate Flat Surface On Grate Flat Surface 3/4" Above Grate Flat Surface 3/4" Above Grate Flat Surface On Contact Flat Surface On Contact Flat Surface 314

  • Above Source Fiat Surface 314
  • Above Source As Found As Len 710 Vots 775 Volts Date Mar 05, 2024 Expires Mar 05, 2025 QC Data* Mar 05. 2024 In tolerance condtbons ore based on test results lnlllng mlhm specdied bmcts wt no reducllOn by the uncei1alll!y of the meosuremen1 Unless otherwise st11:

thlS col1brallon was performed by RSCS

  • 93 Ledqe Rd

. abrool<

1-t U!Jlmnq the follm llQ NIST Traceable sources Pulser 98756

(

Due Ocl 31 2024)

Wor~ed on cahbrobon

,col Wedtg The reported expand unceno,my of measurement 1s s1111 os Ille s ord uncena1n)y ol measurement muh1piled by the coverage lo or k such tna1 1111 wv rug probi!bll*lY cor,~spond, 1o opproxmo1e1y ns*

lions rlorm(IJ,n lorn nee to mo I 11111 Cf lOJO nts AN I 23AB-2013. RSCS Now H m 11,0 R d100 V

RSCS col bl *ion

<i lllll'<l,n rcordanc W tho RSCS Rud,01,nn P,01, "'"' Progr[lrn Mnr*llll nod C fibrat in oord,1nc 1',lth AN I

,<il 7540-1 1f~t4 RSCS, In by ANAB ond meets the requrrf!ITIPnls ol 150'1[C 17025 2017 dernonsuoung to>ehntcnl competence., the held ol

hbrot,

~

of Accrednn*<>n AC-2079 r wtforrnlll!OO bmuons to which 1h1s occred11011on pr,h I 1 i rt Survey Unit STR-109 Page 26 of32 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck

SAVANNAH Technical Staff Survey Unit Release Record I - - -- + i r? - Static Data Count Rate Total Weighted Eff Meter ID Measurement ID (cpm)

(c/d) 25035112 STR-109-01 96 0.1747 25035112 STR-109-02 77 0.1747 25035112 STR-109-03 98 0.1747 25035112 STR-109-04 73 0.1747 25035112 STR-109-05 71 0.1747 25035112 STR-109-06 73 0.1747 25035112 STR-109-07 87 0.1747 25035112 STR-109-08 68 0.1747 25035112 STR-109-09 73 0.1747 25035112 STR-109-10 86 0.1747 25035112 STR-109-11 65 0.1747 25035112 STR-109-12 62 0.1747 25035112 STR-109-13 67 0.1747 25035112 STR-109-14 91 0.1747 25035112 STR-109-15 95 0.1747 25035112 STR-109-16-J 93 0.1747 25035112 STR-109-17-J 88 0.1747 25035132 STR-109-12-D 100 0.1530 Note: Meter ID 25035112, and Meter ID 25035132 are connected to a Ludlum model 43-93 detector with an area of 100 cm2.

Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 27 of32

SAVANNAH Technical Staff Survey Unit Release Record Meter ID 25017651 25035118 25035112 25035112 25035112 25035112 25035112 25035112 25035112 25035112 25035112 25035112 25035112 25035112 25035112 25035112 25035112 25035112 25035112 - Scan Data Min/Max Range Average Location (cpm)

(cpm)

SA-01 80/200 140.00 SA-01 240/381 310.50 SA-01-01 87/156 121.50 SA-02 58/165 111.50 SA-03 35/128 81.50 SA-03 30/125 77.50 SA-04 33/165 99.00 SA-04-01 81/124 102.50 SA-04-02 34/118 76.00 SA-04-03 34/97 65.50 SA-04-04 62/110 86.00 SA-05 23/128 75.50 SA-06 32/185 108.50 SA-07 34/170 102.00 SA-08 28/143 85.50 SA-08 80/130 105.00 SA-09 40/139 89.50 SA-10 30/153 91.50 SA-11 28/125 81.50 Total Weighted eff (c/d) 0.0422 0.1297 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 0.1244 Note: Meter ID 25035118 is connected to a Ludlum model 43-37 detector with an area of 584 cm2. Meter ID 25035112, and Meter ID 25017651 is connected to a Ludlum model 43-93 detector with an area of 100 cm2.

Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 28 of32

SAVANNAH Technical Staff Survey Unit Release Record J -- -- i rt - Quality Control Assessment Measurement Initial measurement Replicate measurement AveraJ?;e Absolute Value of the difference Condition Absolute value of the difference d m/100 cm2 Avera e < 52,300 298.82 Survey Unit STR-109 Value (dpm/100 cm2) 354.82 653.64 504.23 298.82 Control Limit d m/100 cm2 11087.6 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Result

t Pass ----'

Page 29 of32

SAVANNAHTechnical Staff Survey Unit Release Record - Sign Test Measurement Result DCGLw - Result ID

( dpm/100 cm2)

(dpm/100 cm2)

STR-109-01 549.40 69150.60 STR-109-02 440.67 69259.33 STR-109-03 560.85 69139.15 STR-109-04 417.78 69282.22 STR-109-05 406.33 69293.67 STR-109-06 417.78 69282.22 STR-109-07 497.90 69202.10 STR-109-08 389.16 69310.84 STR-109-09 417.78 69282.22 STR-109-10 492.17 69207.83 STR-109-11 371.99 69328.01 STR-109-12 354.82 69345.18 STR-109-13 383.44 69316.56 STR-109-14 520.79 69179.21 STR-109-15 543.68 69156.32 STR-109-16-J 532.23 69167.77 STR-109-17-J 503.62 69196.38 Parameter Result Number of Measurements 17 NumberofS+

17 Critical Value 12 Meets I Doesn't Meet Acceptance Criteria Meets Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck 1 -- -- d l vi Sign

+1

+1

+1

+1

+1

+1

+1

+1

+I

+1

+1

+1

+1

+1

+1

+1

+1 Page 30 of32

SAVANNAH Technical Staff Survey Unit Release Record - Graphical Presentations Quantile Plot of Gross Activity Concentration 600 550

~ 500 0

0

,-.(

6

_g-450 CJ C

Q u

..., 400 CJ 350

  • 300 0%

JO%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Note: Gap between 32% and 50% is due to 3 measurements with the same value. See Table 7-1.

Survey Unit STR-109 Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck Page 31 of32

SAVANNAH Technical Staff Survey Unit Release Record Histogram Survey Unit Number: STR-109 Auxiliary Access Trunk, C-Deck the Cold-Survey Unit Name: Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd), A Deck to C Deck 3.5 3

2.5 S 2 5 &

Cl)

~ 1.5 0.5 0

381 Survey Unit STR-109 406 432 458 484 509 Upper end value (dpm/100 cm2)

Auxiliary Access Trunk, C-Deck Cold Water Chemistry Lab (Port) and Radiation Monitoring Room (Stbd.) A Deck to C Deck 535 561 Page 32 of32

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