ML25328A170

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Us Dept of Transportation - Nuclear Ship Savannah, Survey Unit Release Record Survey Unit STR-104 Containment Vessel (Cv) - 4th Level (C Deck)
ML25328A170
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-104 Containment Vessel (CV) - 4th Level (C Deck)

Approved:

Senior Technical Advisor Prepared by:

Nuclear Ship Support Services, LLC

SAVANNAH Technical Staff Survey Unit Release Record PREPARED BY /DATE:

PEER REVIEW/ DATE:

DECOMMISSIONING PROGRAM MANAGER REVIEW/ DATE:

INDEPENDENT REVIEW/

DATE:

FSS MANAGER REVIEW/ DATE:

LICENSING COMPLIANCE MANAGER REVIEW/ DATE:

SAFETY REVIEW COMMITTEE SUBMITTED/APPROVED Survey Unit STR-104 D. Roberson Douglas Roberson Digitally signed by D. Roberson Date: 202s,os,1 s J 2:48:28 -os*oo*

Date p ete HO 11 en bee k Digitally signed by Pete Hollenbeck Date: 2025.05.15 14:29:54 -04'00' Pete Hollenbeck, CHP Date Soeuth Caleb Soeun Soeuth C. Soeun James Reese, CHP, RRPT James Reese Digitally signed by Soeuth Caleb Soeun Date: 2025.05.1910:19:16-04'00' Date Digitally signed by James Reese, CHP, RRPT Date: 2025.05.20 06:37:01 -07'00' Date Dan *, e I R M *,ha 1

  • 1 k Digitally signed by Daniel R. Mihalik Date: 2025.05.21 07:26:08-04'00' Daniel Mihalik Date JO h n Osborne ~~~ally signed by: John Osborne DN: CN = John Osborne LCM email LCM

= jmosborne@nsss.llc C = AD Date: 2025.06.05 12:37:30 -05'00' John Osborne Date 5/26/2025 6/2/2025 Submitted Approved Page2 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record TABLE OF CONTENTS

-)

1.

EXECUTIVE SUMJ.\\.1ARY.................................................................................................... 6

2.

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

3.

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

4.

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

5.

SURVEY DESIGN............................................................................................................... 11

6.

SURVEY IMPLEI\\fENTATION......................................................................................... 13

7.

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

8.

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

9.

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

10. REI\\fEDIATION AND RESUL TS...................................................................................... 17
11. CHANGES FROM THE FINAL STATUS SURVEY PACKAGE................................. 17
12. DATA QUALITY ASSESSI\\fENT (DQA)......................................................................... 17
13. ANOMALIES........................................................................................................................ 17
14. CONCLUSIONS................................................................................................................... 17 1S. REFERENCES..................................................................................................................... 18
16. ATTACHMENTS................................................................................................................. 19 Survey Unit STR-104 Page 3 of35 Containment Vessel (CV) - 4th Level (C Deck)

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........................................................ 10 Table 4 Operational DCGLs................................................................................................ 10 Table 5 STR-104 Systematic Measurement Designations................................................. 12 Table 5 Scanning Coverage................................................................................................. 12 Table 5 Investigation Levels................................................................................................ 13 Table 7 Summary of Systematic, Judgmental, and QC Static Measurements................ 15 Table 7 Basic Statistical Properties of Static Measurement Population.......................... 15 Table 7 Scan Measurement Summary................................................................................ 16 Survey Unit STR-104 Page4 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAHTechnical 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 L TP License Termination Plan MARAD Maritime Administration MARS SIM 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-104 Containment Vessel (CV) - 4th Level (C Deck)

Page 5 of35

SAVANNAH Technical Staff Survey Unit Release Record

1.

EXECUTIVE

SUMMARY

This Survey Unit Release Record for survey unit STR-104, Containment Vessel (CV) -

4th Level (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-104 show that the maximum gross activity concentration among systematic and judgmental measurements is equal to 50,660.35 dpm/100 cm2, which is 96.86% 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-104 is acceptable for unrestricted release. The mean gross activity concentration among the systematic and judgmental measurements is equal to 4,911.14 dpm/100 cm2, which is 7.05% of the 15 mrem/y gross activity DCGLw of 69,700 dpm/100 cm2. The mean gross activity concentration is equal to 1.06 mrem/y for the survey unit.

2.

SURVEY UNIT DESCRIPTION STR-104 is an impacted Class 1 survey unit. The containment vessel housed the reactor plant and some supporting systems. The 4th level gives access to the pressurizer platform, the reactor head area, and the personnel and equipment hatches. The survey unit consists of the internal surfaces of the CV shell/bulkheads and the deck/new fiberglass grating.

Based upon Computer-Aided Design drawings, the 4th level deck surface area is approximately 24.57 square meters (24.57 m2); the total surface area, including the shell, is approximately 153.62 m2; this includes the shell surface above 2 meters. Refer to of this report for figures and maps depicting survey unit STR-104.

Survey Unit STR-104 Page 6 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record

3.

CLASSIFICATION BASIS Based on the NSS Historical Site Assessment [HSA] [5], survey unit STR-104, identified as survey unit 101Al in the HSA, was identified as a Class 1 structure survey unit. Primary coolant leaks were experienced from time to time, as was typical of nuclear power plants of the era. Coolant was released as steam condensed and drained to the bottom of the containment vessel, from which it was collected in tank PD-T4, the containment drain tank.

In August of 1966 a leak produced low-level contamination in the containment vessel that was decontaminated using a detergent solution. In 1968 a primary system leak from a pressure relief system isolation valve occurred. In 1969 a primary system leak from a control rod drive buffer seal was observed. On another occasion in 1969, 3,500 gallons leaked from a primary coolant pump vent pipe. Based upon a review of the historical information, the results of the characterization survey data, the 2024 Remedial Action Support Survey (RASS) STR-104-RASS-01-Rev 0, and the completion of a final Survey Unit Classification Worksheet, the correct final classification of survey unit STR-104 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 L TP in accordance with MARS SIM. 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-104 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 Survey Unit STR-104 Page 7 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAHTechnical Staff Survey Unit Release Record consistent with the guidance contained in Section 3.3 of NUREG-17 57, Volume 2, Revision 1, Consolidated Decommissioning Guidance - Characterization, Survey, and Determination of Radiological Criteria [7]. In all analyses, Cs-13 7 and Co-60 contribute nearly 100% of the total dose. The remaining radionuclides were designated as IC. Because 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-L TP 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 1.63E-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 2.1 lE-05 Ag-108m 8.30E-04 l.38E-04 Cs-137 4.57E-01 7.61E-02 7.61E-02 H-3 l.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 Survey Unit STR-104 Page 8 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record Radionuclide Cs-137 DCGLw (dpm/100cm2) l.20E+05 rt 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:

DCGL DCGLETD X DCGLHTD surrogate =

(/ HTD:ETDXDCGLETD)+DCGLHTD Where:

DCGLEm =

the DCGL for the easy-to-detect radionuclide DCGLHm =

the DCGL for the hard-to-detect radionuclide Equation 1 FHTD: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 2

DCGLco-60surrogate = 2.37E + 04 X (

)

E

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

Where:

fn n

DCGLn 1

Gross Activity DCGLw =

11 12 In DCGL1 + DCGL2 +***vcGLn

=

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.

Survey Unit STR-104 Page 9 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record Table 4-3-Re-normalized Co-60 and Cs-137 Fractions Normalized Only Co-60 Re-sum of and Cs-137 normalized Nuclide fractions Fractions Fractions C-14 5.61E-03 Co-60 l.63E-02 l.63E-02 l.76E-01 Ni-63 9.00E-01 Sr-90 l.54E-06 Tc-99 2.1 lE-05 Ag-108m l.38E-04 Cs-137 7.61E-02 7.61E-02 8.24E-01 H-3 3.21E-04 Fe-55 l.35E-03 Am-241 9.66E-08 Pu-239/240 8.0lE-08 Totals l.00E+00 9.24E-02 l.00E+00

-f-if ---

Solving Equation 2 using the re-normalized Co-60 and Cs-13 7 fractions and the Co-60 surrogate DCGL is shown below.

1 Gross Activity DCGLw =

1 7 6 E - l 8

_ 24E - l = 6.97E+04 dpm/100 cm 2

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/100cm2)

Co-60 l.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 Survey Unit STR-104 Page 10 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record x --. --- bri 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 (Ncr) 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),

divided by sigma ( cr ), which is the standard deviation of the data set used for survey design.

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

Remediation and RASS surveys were performed between 05/16/24 and 07/25/2024. A total of sixty-three (63) static measurements and 133 smears were collected. Post decontamination, no smears had alpha activity greater than the minimum detectable activity. The maximum beta activity was 207.37 dpm/100 cm2. The average total surface activity concentration and standard deviation of all static the measurements were 2,898 and 5,053 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-104 is based upon the RASS survey results and was calculated as follows:

52,300-26,150 Relative Shift=------= 5.17 5,053 Because the calculated relative shift was greater than three (3), the value of two (2) was used as the adjusted Ncr. 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-104.

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-104.

Survey Unit STR-104 Page 11 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record Table 5 STR-104 Systematic Measurement Designations Label LX(m)

LY(m)

Surface STR-104-01 5.62

-4.98 CV Shell STR-104-02 9.22

-4.98 CV Shell STR-104-03 12.81

-4.98 CV Shell STR-104-04 3.82

-1.86 CV Shell STR-104-05 11.01

-1.86 CV Shell STR-104-06 14.61

-1.86 CV Shell STR-104-07 2.02 1.25 CV Shell STR-104-08 5.62 1.25 CV Shell STR-104-09 12.81 1.25 CV Shell STR-104-10 16.41 1.25 CV Shell STR-104-11 3.82 4.37 CV Shell STR-104-12 7.42 4.37 CV Shell STR-104-13 11.01 4.37 CV Shell STR-104-14 14.61 4.37 CV Shell STR-104-15 13.22

-1.89 Grating 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-104-03 was chosen for the replicate measurement. In addition, the survey package also specified to perform QC operability checks of field instruments 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-104-16-J and STR-104-17-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-104, five scan areas were established SA-01 through SA-05. 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-104.

Survey Unit STR-104 Page 12 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record For this Class 1 structure survey unit, the "Investigation Levels" for direct and scanning measurement results are those levels specified in L TP Chapter 5, Table 5-2, and are reproduced below in Table 5-3.

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

> Operational DCGLw > Operational DCGLw and an outlier*

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.

SURVEY IMPLEMENTATION For survey unit STR-104, 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-104-00-00, which included DQOs, survey design, detailed FSS instructions, survey maps and survey forms. FSS field activities were projected to take twelve (12) 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 July 29, 2024, July 30, 2024, August 05, 2024, through August 07, 2024, and December 10, 2024.

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 Survey Unit STR-104 Page 13 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record 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 five scan areas, SA-01 through SA-05, were scanned, resulting in 100% of the total 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 this release record. Scanning was performed with the detector held approximately 0. 7 5 inches from the surface while moving at a speed of one detector width per second.

The implementation of survey specific QC measures included the collection of one replicate static measurement. The random location of the replicate measurement was STR-104-03 and identified as STR-104-03-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.

SURVEYRESULTS 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 41t contact Tc-99 efficiency is 0.1002 c/d and the 41t 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 for painted surface measurements was 130 cpm and was rounded up to 150 cpm. The painted surface contact detector weighted efficiency is equal to 0.0858 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 I-minute static measurements equal to 699.7 dprn/100 cm2.

This value is 1.3% of the operational DCGLw and 1 % of the gross activity DCGLw.

The highest ambient background count rate from a I-minute count for fiberglass grating measurements was 80 cpm and was rounded up to 100 cpm. The fiberglass grating contact detector weighted efficiency is equal to 0.0159 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 I-minute static measurements equal to 3,119.0 dpm/100 cm2*

This value is 6.0% of the operational DCGLw and 4.5% of the gross activity DCGLw.

Table 7-1 presents the activity concentration for all static measurements.

Survey Unit STR-104 Page 14 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record Table 7 Summary of Systematic, Judgmental, and QC Static Measurements Activity Concentration Measurement ID

( dpm/100 cm2)

STR-104-01 1352.68 STR-104-02 1562.57 STR-104-03 1142.78 STR-104-04 1562.57 STR-104-05 1282.71 STR-104-06 1236.07 STR-104-07 1061.15 STR-104-08 1259.39 STR-104-09 4337.89 STR-104-10 1236.07 STR-104-11 1084.47 STR-104-12 1434.30 STR-104-13 1364.34 STR-104-14 1306.03 STR-104-15 5431.04 STR-104-16-J 50660.35 STR-104-17-J 6175.02 STR-104-03-D 782.60 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 1061.15 dpm/100 cm2 Maximum Measurement 50660.35 dpm/100 cm2 Mean 4911.14 dpm/100 cm2 Median 1352.68 dpm/100 cm2 Standard Deviation 11898.32 dpm/100 cm2 Coefficient of Variation 2.42 unitless Residual activity dose rate 1.06 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-104, the calculated dose from residual activity is 1.06 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 of200 cpm, a distance of0.75 inches, and the painted surface detector weighted efficiency of.0655 c/d, Survey Unit STR-104 Page 15 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record or the fiberglass grating surface detector weighted efficiency of 0.0113 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 painted surfaces is 662.8 dpm/100 cm2, and the MDC for scanning fiberglass gratings is 3,856.0 dpm/100 cm2

  • The respective values are 1.3% of the operational DCGLw and 1.0% of the gross activity DCGLw for painted surfaces or 7.4% of the operational DCGLw and 5.5% of the gross activity DCGLw for grating surfaces.

Calculation of the scan MDC for the Ludlum 43-93 detector used the rounded count rate of 125 cpm, a distance of 0. 7 5 inches, with the painted surface detector weighted efficiency of 0.0632 c/d, or the rounded count rate of 100 cpm with the fiberglass grating surface detector weighted efficiency of 0.0142 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 painted surfaces is 2,407.7 dpm/100 cm2, and the MDC for scanning fiberglass gratings is 9,617.0 dpm/100 cm2. The respective values are 4.6% of the operational DCGLw and 3.5% of the gross activity DCGLw for painted surfaces or 18.4% of the operational DCGLw and 13.8% of the gross activity DCGLw for fiberglass 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-01 106.73 - 13455.20 6780.97 SA-02 2738.46 - 12719.05 7728.76 SA-03 2590.60 - 7066.14 4828.37 SA-04 4239.68 - 12582.90 8411.29 SA-05 455.49 - 20491.80 10473.65 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-104-03-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.

Survey Unit STR-104 Page 16 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record Control limit= 26,150/10*4.24 = 11,087.6 dpm/100 cm2.

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-104 has met the DQOs of the FSS package. The survey unit is properly classified as Class 1.

Survey Unit STR-104 Page 17 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record The sample data passed the Sign Test. The null hypothesis was rejected. Therefore, the survey unit meets the release criteria.

The dose contribution from residual activity in survey unit STR-104 is 1.06 mrem/yr TEDE, based on the mean activity of measurements used for non-parametric statistical sampling.

Survey unit STR-104 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 (MARSSlM), Revision 1, August 2000".

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

[6] "CR-139, TSD 21-089, Calculations to SupportNSS 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 01 ".

[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-104 Page 18 of35 Containment Vessel (CV) - 4th Level (C Deck)

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-104 Containment Vessel (CV) - 4th Level (C Deck) t Page 19 of35

SAVANNA/I Technical Staff Survey Unit Release Record Survey Unit STR-104 - Figures and Maps Location of the Containment Vessel (CV) - 4th Level (C Deck)

Containment Vessel (CV) - 4th Level (C Deck) l -- -- rst Page 20 of35

SA VAN NAN Technical Staff Survey Unit Release Record l - -- -t Yst Containment Vessel (CV) - 4th Level (C Deck) Systematic and Judgmental Static Locations Survey Unit STR-104 R--104--07 STR-104-04

. '()4..17.J LEGEND:

~-

LO<.a,

-°'91"""'

Containment Vessel (CV) - 4th Level (C Deck)

STR-11)4-1'.!

TR-104-05 STR-' [).>.01 NOTES*

CVSl-i SHO'/MINFLATTE EW(32"to 41')

SAMPLE LOCATIONS CREA TED I VISUAL SAMPLE PLAN NUMBER OF SAMPLES 15 PLACEMENT METHOD* SYSTEMATIC STARTLOC* RANDOM STR-'04-l&J r

VSP Origin Point in Ship Coordinates:

I' Aft of Frame 123 On Centerline 32'0" above baseline BOW b Page 21 of35

SAVANNAH Technical Staff Survey Unit Release Record Containment Vessel (CV) - 4th Level (C Deck) Scan Areas SA-01 SA-01 BOW D Survey Unit STR-104 Containment Vessel (CV) - 4th Level (C Deck)

J - - -- d lst Page 22 of35

S1 v ANNAJJ Technical Staff Survey Unit Release Record 1 - - d - Calibration Records C3hbr3tlon CertrfIQte

  • ID Number: 250J5112000
  • 20240606
  • 0 RSCS Cuslomer: Scott lt:1 Rao 11011 SJ!c & Con IOI 93 Ledge Road Seabrook NH 03874 Testt I

Test2

,ces Inc I

lnstrumenl LUClum I 3002 Probe Model Ludlum 43-93 Precision Check Te<a\\3 I

P.1ean I

Ser1,11 Number 25015112 Seri,11 Number 421'117 Results 5.00 kcpm I

4.99 kcpm I

4.99kcpm I

4.99 kcpm I

P.iss Accuracy Check Ra T,

t Valut*

As Found Sour I

AUTO 500 Ktpm" 500 Kcpm #

500 Kcpm #

Pulser 98756 AUTO 50Kcpm =

50Kcpmlf 50Kcpm*

Pulser 98756 AUTO

'Kcpmlf 5 Kcpm 11 5Kcpm It Pulser 98756 AUTO 05 Kc

=

0 499K

I 0499K Pulser 7

Readings with

  • 111<1 ca:e ranges wnere As-Found readings are >~ 01 Target value RP.id1ngs with **,n<11 e As¥n re

.ngs are > 10'1<. or Targ"t valtl" Readings with = die.re ranges were calibrated USIOQ a pulser Probe lsolope 43-934214'7 Cs-137(Beta) 93 42tJ 17 Tc-99 43-q3 J2 IJ 17 Tc-99

'.;13 4214 17 CS-137(Beta)

.93 J21J 7 Cs 137(Beta) 43-93421J17 Tc-99

~3421417 lc-99 43.93 4214 17 Cs-137(Beta)

C;ustomer Equ pmen ID Callbfa'ed BY COie Wedlg Efficiency NIST Source ID 0 1901 C/0 (4 Pt) 7357 Cs-137(Beta) 0 1028 CID (4 Pt) 127W Tc-99 0 0699 CIO (4 Pi>

127 56 Tc-~

0 1360 C/0 (J Pl)

I 7357 CS-137t6E:ta) 00167 C/0 (4 127357 Cs-137(Beta) 0 0076 CID (4 Pt) 127356 Tc-99 0 0056 C/0 (4 Pl) 127356 Tc-99 00152C'U(4 Pt) 127357 CS 137(Beta)

EI.Wonics Checks HI hVotta oc R vtewB Ma Hunter

  • It

"'1 t,vRSC$ at 93 L~

Rd Geomelry Flat SU'face F I Surf.ice FIJI SUrface I Sl61ace Fl.JI Surface Flat SU!face fl;Jt~ace F

SlrtlC Comment On Contact On Contact 114" ve Source

Y4
  • Above source On Gra:e 704 Volts Date Jun 06 20 4 Exptres* Jun 06, 2025 QC te JUn 06 2024 rne-:1 n1 The r NIST Tracoa

'-OUrc~s

?SCS ~ allorl

,ce ;ii SI N32l"8*

13 RSCS Net,

in, t e RSCS R.101"'!00 ProteetlOn Prag l 2 tr Survey Unit STR-104 Page23 of35 Containment Vessel (CV) - 4th Level (C Deck)

S1rANNA11 Technical Staff Survey Unit Release Record it -- -

Calibration Certificate* ID Number: 25035113000. 202401 31

  • O RSCS Customer: Matthe,vG Hunter Instrument Radiation Safety & ContrOl Services, Inc Ludlum Model 3002 93 Ledge Road Seabrook NH 03874 Probe Model Ludlum 4 3-37 Precision Check Test1 Test2 Test3 Mean 5.01 kcpm 4.99 kcpm 5.00 kcpm 5.00 kcpm Accuracy Check Range Target Value As Found As Len AUTO 500 Kcpm:

500Kcpm#

500 Kcpm:;

AUTO 50Kcpm:;

49.9 Kcpm #

499 Kcpm #

AUTO 5 Kcpm;;

5.01 Kcpmi:

5 01 Kcpm::

AUTO 05Kcpm::

0.499 Kcpm =

0.499 Kcpm:

Readings With

  • Indicate ranges Where As-Found read, gs ere >20'lb or Target value Readings v.1th.. Indicate As-left readings are > 10, ofTarget va e Readings With :: 111d1cate ranges were cahbrated using a pulser Probe lsoto e Efficlenc NIST Source ID Geomet Serlal Number 250351 13 Serlal Number 190949 Results Pass Source ID Pulser 98756 Pulser 98756 Pulser 98756 Pulser 98756 Comment 43-37 190949 Tc-99 0.0585 CID (4 Pl) 127356 T c-99 Fla Surface 3/4" Above Flat Surface 43-37 190949 Cs-137(Beta) 43-37 190949 Tc-99 43-37 190949 Cs-137(Be1a)

Physical Checks Outer Physical Check: Pass Tap Tesl Pass Audio Function Chee~ Pass Calibration Date Set Pass

0. 1703 CID (4 Pl) 127357 Cs-137(Beta) 0.0276 C/0 (4 Pl) 127356 Tc-99 0 0387 CID 4 Pl) 127357 Cs*l37 Beta)

Electronics Checks Flat Surface 314" Above Flat Surface Flat Surface 314

  • Above Grate Flat Surface 314" Above Grate As Found As Left 900 Volts 1800 Vo.ts Comments Calibrated with Ludlum 43-37 S'N 190949 using 20' C to C cable for 1 and overhead set up Customer Equ,pment ID Callbraled By Nicole Wedlg

.)

QC Revle,.. By Matthew Hunter tll\\11 700 ' F o,

Pr UI

lO 12rnllg Dale Jan 31 2024 Expires Jan 31 2025 QC Date Jan 31. 2024 In oleronce cond on test

,i n no reducllon by the uncer1mnty ol the measurement This Cllhl.-ohon w RSCS u 109 1ST Put 1 "67' f1 * (Col Uue Ocl l t 70.14)

WOfl,.ed on cohbro11on N,cole Wed Th r,p<>rled '*lnd* UI 11,mty of n

,ur nl IS IJ Ille coverage probobtl IV conesponds to opproxlllllllety 95.

t 111d,~d unc or me ur!'ln<*nt n.,n,pl I by u co, rag, f.; tor, uch 1h t Uri

oth, Matenal LJc SUlndord r lrhf 11011 1 rforrood ** contom, to !ho rollo.-,ng documoni AN<;I N3131\\B-:>O 13 RSCS No., H mpsl"rn R hooctr uon servrces are perlonned in occordance wllh !he RSCS Ra, 11011 Prolecuon Progr m Manual ond rbrollllll occordance.,,111 ANSl NCSL 2540 1-1994 RSC. Inc ANAB nd of I IEC 1702520 17 v.tnl den ibrnlltln alld rntoon

,n or1no11011 on 1\\lpes 01

,1>ro11ons This c bro be reproduced ei<cept n tu..,thou, the express wnr.en consen of R ac.-.S,em(.N1ne

.. AJl1*

flOli

  • 7 '71~

l nee II\\ l fi Id of I I rt Survey Unit STR-104 Page24 of 35 Containment Vessel (CV) - 4th Level (C Deck)

S1vANNA11 Technical Staff Survey Unit Release Record C..llbr.ttion cenlfic;iie -10 Number: 25035118000 - 20240606 - 0 RSCS customer:

  • r Rad a,on S f

& eon rol se111 ces Inc 93 Ledge Road Seabrook NH 0387 4 Instrument Ludl m t.1ooeI 3002 Probe Model Lu<llum.13-37 Precision Check sen.ti Number 25035118 Serl:il Number 281 3

Te!.tl I

Test2 I

Te513 I

Mean I

Results 4.99 kcpm I

5.01 kcpm I

5.00 kcpm I

5.00 kcpm I

Accuracy Check Range Taroet Value AsFoun<l Aslefl AUTO 500 Kcpm#

500Kcpm I<

500Kcpm,t AUTO 50Kcpm #

-199Kcpm*

499Kcpm"I AUTO 5 Kcpm#

4 99Kcpm#

4 99Kcpm ot AUTO 05Kcpm#

0501 Ktpmit 0.50 1 Kepm#

Re.i<l ngs with

  • ln<l cate ranges wnere As-FOUT1<1 reao,nqs are -,.20° of Target value Read,ngs with ** Indicate As-le reao,ngs are > 10-.. of Target value Reao,ngs, II !Odlca:e rang Y, re c hbraled US111Q a put er Probe Isotope 37 281043 Tc-99 43.37 2810-13 Cs I37(Be 37 281043 Tc-99 43-37 28 l0-13 Cs-I37*Beta) 43-37 2810.13 Tt-99 43 37 281 3

Cs 137(Be )

43-37281043 Tc-99 43-37 281043 Cs-I37(Beta)

Ph Slc;JI Checks Outer Phys1tal Check Pass TapTes Pass Auct F1¥1ct,on ~

P s coro check Pass hbrahon Date Set Pass Comments Effiaermes performed u CUstom Eq pmen ID Efficiency NIST Source ID 0.107' O(-I PI) 127356 Tc-99 0 1345 0(4 Pi) 127357 Cs 137(Bet:J) 0 0073 CID (-l Pl) 127356 Tc-99 00 121 CIO(-l PI) 127357 Cs-137\\Beta) 0 I

~ D(-lPI) 127356 Tt-99 0 17 1 CID (4 PI) 1273~7 C 137(6 'J) 0 0113 CID (4 Pl) 127356 Tc-99 0.0136 CID (4 PI) 127357 Cs-I37\\Beta)

Electronics ChtckS HIohV lass grate as reques ect Geometry F t Surface r t Surface Flat Surface Flat Surface F t Surfa F t rfa A..1t Surface Flat Surface As Found 1751 Volts P.tss Soofce 10 Pulser 98756 Pulser 98756 Pulser 98756 Pulser 987 56 Comment 314" l>JX)ve Source 31

  • AllOve Source 3/4" Abolle Grate 3/4" l>JX) e Grate on Source on Source on Grate On Grate AslAft

!BOO Volts J1br.Jtea B N role Wectig OC Review El) Marth *;

H nt r Date. Jun 06. 2024 Expires Jun 06. 20 5 QC Date Jun 06. 2024

  • 11'9 b, e un{ rt 1 *, of Ille e

.!l'ent r::.U by RSCS 31 93 Led9e Rd S oot. NH u* cno p

,ont per'.orrr.

ce 10 Aing doc1,m*0n1s RSCS 11,,n e p;,t1 In 3Ceool3 11,1 'l ed 111 3CGOI03nte '" ANS,CSL Z~.t0-1-1 l 2 h rl Survey UnitSTR-104 Page25 of35 Containment Vessel (CV) - 4th Level (C Deck)

S1vANNA11 Technical Staff Survey Unit Release Record Calibration Certificate - ID Number: 25035132000. 20240305. 1 RSCS customer: Matllle G Hunter Radiation Safety & Control Services Inc 93 Ledge Road Seabrook NH 03874 Instrument Ludlum Model 3002 l'robe Model Ludlum 43-93 Precision Check Serial Number 25035132 Serial Number 421425 Test1 Test2 Test3 Mean Results 5.00 kcpm 4.99 kcpm 4.99 kcpm 4.99 kcprn Accuracy Check Range Target Value As Found A, Left AUTO 500 Kcpm#

499 Kcpm #

AUTO 50 Kcpm/t 50 Kcpm it AUTO 5 Kcpm,;

5 Kcpm,;

499 Kcpm #

50 Kcpm#

5 Kcpm#

AUTO 0.5 Kcpm I' 0.498 Kcpm #

o 498 Kcpm#

Readings with

  • Indicate ranges where As-Found readings are >20"4 of Target value Readings With ** Indicate As.Jell readings are >10
  • of Target value.

Readings with /t Indicate ranges " ere ca brated uslng a pulser Probe lsoto

  • 43.93 421425 Tc-99 43.93 421425 Cs-137(Beta) 43-93 42 1425 Cs-137(Bela) 43.93 42 1425 Tc-99 43.93 42 1425 Cs-137(Bata) 43-93 42 1425 Tc-99 43-93 421425 Cs-1 37(Beta) 43.93 421425 Tc*99 Light Chee of Scinblalion Probes Pass Outer Phys cal Check Pau Tap Test Pass Audio Function Check Pass Cord check: Pass Calibration Data Sat. Pass Efflclanc 0.0243 CID (4 Pl) 0 0505 C/0 (4 Pl) 0 0398 C/O (4 Pi) 0.0177 C/0 (4 Pl) 0 1620 C1D (4 Pl) 0 1108 C,O (4 Pl) 0 1193 CID (4 Pl) 0.0821 C/O (4 Pl)

Comments: Calibrated with 20' C to C cable Customer Equipment 10 NIST source 10 127356 Tc-99 127357 Cs-137(Beta) 127357 Cs-137(Beta) 127356 Tc-99 127357 Cs-137(Beta) 127356 Tc-99 127357 Cs-137(Beta) 127356 Tc-99 Electronics Checks High VOitage Geomet Flat Surface Flat Surface Flat Surface Flat Surface Flat Surface Flat Surface Flat Surface Flat Surface As Found 678 Volts Pass Source 10 Pulser 98756 Pulser 98756 Pulser 98756 Pulser 98756 comment On Grate On Gra1e 314' Above Grate 3/4' Above Grate On Contact On Contact 314" Above Source 314" Above Source As Len 780 Volts Calibrated By Nicole Wedlg QC Review By Ma thew Hunter Oete Mar 05, 2024 Expires. Mar 05, 2025 oc Date Mar 05. 2024 I OITIIIUIC Pt * ')Uf 30 2!f 111119 re on I t r i-t

~ roll lg w11t11n terf"

~m1 w11h no,

uctJon by lhe unc ury or th r

~ren :.tll Unles5 0 U10,wr,o st lh,s c hbmtJon was porlormed by RSCS et 93 L edge Rd Seol*ook. N H ullhllog lhe loJowmg N IST Troe b

  • sources Pul 1 87!,G (C I Due Oct 31 W ~)

Wor~ on col1brot,on N cole Wedlg rhe reponed expand uncer1,mty ol meosuremern 1s stated as th standard unc ruuntv oC measuremen multJpbed by !he covera e lactor such that h

covrrog prOI>

,iiy ran.,.;pooos to pproximm ly 95 '

Unless otherwise Slated coobrolJOlls penormea In conformance 10 the fol ng documents St N323AB-20 13 RSCS New t tompshlre Roa1 CtJVe Mmenol l IC~nse Number 381R RSCS Clllbrouoo SE'MCPS nrP J"'florme,1,n 0C<CYd".IOC

'1th the R C'S Rn<1mt1011 Pro*ecnon Pmgmm Marmol l!fld Standard Operehng Procedur Y2 l.-.;*~ ~._, ow

,oc S:::s-1))9

ri Survey Unit STR-104 Page26 of35 Containment Vessel (CV) - 4th Level (C Deck)

S 1vA.NNA11 Technical Staff Survey Unit Release Record C.illbr.itIon CertlfI~te - ID Number: 250351~000 - 202,40606 - 1 RSCS Customer: Scott Ginter R;i<11a*10n Saf Con*

Services. Inc 93 Ledge Road S brook HO 87J Instrument Lu um Moo 1 3002 Probe Model Ludlum J3-93 Seri.ii Number 25035134 Seri.ii Number J2I368 Precision Check Testl I

Test2 I

Test3 I

Mean I

49.90 kcpm I

49.90 kcpm I

49.90 kcpm I

49.90 kcpm I

Accuracy Check Range Target Value As Found Aslett AUTO 500 Kcpm11 500Kcpm#

SOOKcpm II AUTO 50Kcpm;o 49 9 Kcpm I' J99 Kcpm'<

AUTO 5Kcpm/l 5 Kcpml/

AUTO 0 5 Kc.om 1' 05Kcpm#

Read11gs 1111n

  • llldlC3te ranges v.here As-Found readings are 20*,. of Target value Readngs lue Rea ngs Probt Isotope 43-93 421368 Cs-I37(8eta) 43-93 421368 Tc-99 93 42 1368 Cs-I 37(Beta) 43-93 421368 Tc-99 43-93 42 1368 Cs-I 37(8eta) 93421368 Tc-99 43-93 421368 Cs-I37(Beta 9342t368 Tc-99 L.Jgh Chee 01 Sc.In ahon PrObes Pass Outer P ~'SI I Chee Tap Test. Pass Aud F111cl n Che P s Cord check Pass Efficiency NIST Source ID 0 0158 CID (4 P1) 127357 Cs-137(Beta) 00162 (4 P1) 63%3 (BetJ) Tc-99 0 0160 CID (4 PI) 127357 Cs-137(8eta) 0 0055 Cl (4 Pl) 127356 Tc-99 0 1755 CID (4 P1) 127357 Cs-137(Beta) 0 0975 CID (4 PI) 127356 Tc-99 0 1238 CID (4 P1) 127357 Cs-137(Beta) 0 Oti58 CID (4 Pl) 127356 Tc-99 Electronics Checks H1 hV e

Commen s Etfla nc s performed using I 5 fiberglass grate as reques ed Cu tom Equ1pmen ID 5 Kcpm#

0 5Kepm#

Geometry Flat Surface LJt Surface Flat Surface LJt Surf ce Flat Surface F tSurfJce Flat Surface Flat Surf ce As Found 700 VOi s ResUIIS P3SS Source ID Pulser 66151 Putser66151 Pulser 66151 Pulser 66151 Comment On Grate On Grae 3/4 Above Grate 3/4" Nxrve Gr.I e On Contact OnCOntact 3*4" Abo11e Source 31J" AIJoYe Source As Left 700 VOits R

le\\\\-8 !,a he Hunter D

Jun 06, 2024 Unless o:he

>ed by RSCS at 93 L~ Rd p,~

r r-61~1

'I by e l.rlCe a,~-, of Exptres Jun 06. 2025 ac Date Jun 06. 202J NH 11:"<I e I g NIST

  • ce3ble OOU<teS s:and unce nr1 cl rreas ern m rrul ea by Ille co,er:,ge f.>elor k sucn al s

St.llldJ.'ll Operab,~J Procedllres 1 br:lllon L nci, v.

~"'"'

h rl Survey Unit STR-104 Page27 of35 Containment Vessel (CV) - 4th Level (C Deck)

S1vANNA11 Technical Staff Survey Unit Release Record e

Calibration Certificate

  • ID Number: 25035147000
  • 20240708
  • 0 RSCS Customer: Scott Ginter Instrument Serial Number Radiation Safety & Control Services Inc Ludlum Model 3002 25035147 93 Ledge Road Probe Model Serlal Number Seabrook NH 03874 Ludlum 43-93 421411 Precision Check Test1 I

Tesl2 I

Test3 I

Mean I

Resutts 5,00 kcpm I

5.00kcpm I

5.00 kcpm I

5.00 kcpm I

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

500Kcpm#

Pulser 66 151 AUTO 50 Kcpm#

50 Kcpm#

AUTO 5 Kcpm II 5 Kcpm#

AUTO 0.5 Kcpm It 0.5 Kcpm#

Readings with

  • lndltllte 111nges where As-Found readings are >20% of Target value.

Readings w,th *

  • Indicate As-'en readings are > 10~ of Target value Readings with ;; Indicate ranges were calibrated using a pulser Probe Isotope 43-93 421411 Cs-137(Beta) 43-93 4214 11 Tc-99 43-93 421411 Cs-137(Beta) 43-93 421411 Tc-99 43-93 42141 1 Cs-137(Beta) 43-93 421411 Tc-99 43-93 4214 t 1 Cs-137(Beta) 43-93 4214 11 Tc-99 Physical Checks Light Check of Scintllation Probes Pass Outer Physical Check Pass Tap Test P8$S Audio Function Check Pass Cord check Pass Efficlencv 0.1940 CID (4 Pl) 0 1231 CID (4 Pi) 0 1435 CID (4 Pi) 0 0766 CID (4 Pi) 0.0197 CID (4 Pi) 0 0097 CID (4 Pi) 0 0170 CID (4 Pl) 0.0064 CID (4 Pl)

Comments E clencles Using 1 112* Fiberglass Grate Provided Customer Equipment ID NIST Source ID 127357 Cs-1 37(Beta) 127356 Tc-99 127357 Cs-1 37(Beta) 127356 Tc-99 127357 Cs-137(Beta) 127356 Tc-99 127357 Cs-137(Beta) 127356 Tc-99 Electronics Checks High Voltage Calibrated By Jarod Fagan QC Ravia w By Mallhe"'

Hunter Alm r~

11c Co,,*,ons Tem1 rotor 71 6 *r Humld1Iy 4 O S. 11 tnc Pr surtt 29 88 111 Ilg 50 Kcpm#

Pu ser 66151 5 Kcpm II Pulser 66151 0.5 Kcpm it Pulser 66151 Oeometrv Comment Flat Surface On Source Flat Surface On Source Flat Surface 3/4° Above Source Flat Surface 314° Above Source Flat Surface On Grate Flat Surface On Grate Flat Surface 3/4" Above Grate Flat Surface 3/4" Above Grate As Found As Left 682 Volts 682 Volts Date Jul 08, 2024 Expires. Jul 08, 2025 QC Date Jul 08. 2024 In tol ranee con uons are llnsed oo Lest resullS fall w11h1n specified llrnr.s with no reducllon by the uncertam ol lhe measU1ement The r IS cor11.J1ned helein r o* only lo lhe rlllm c I Unless o:il<>fwJse sluled thr<i hbrnllon was perfOfmed by RSCS ol 93 Led\\18 Rd Pulser 66 I~ I (C8I Due Apr 05. 2025)

Worl(ed on C.allbrauon Jarod ~aqom Nicol Wed!Q The reported exp nded unce 11y ol meosur nt Is sro oo as th stondard unc tho coveroge prob!Jbtl,ty corresponds l PPIO,mai *IY 9'.,

  • Nil UIIIZIIIIJ 110,,,ng NIST Trocea It! sources IY of measurement mu ip ad by COV8!0!J foct01 k such thol Unles5 ated pert 10 the I wng documen ANSI N323AB 2013. RSC$ N w H m hire Rad div Mn1ro mllOf 3R 1R R<;CS lihr,JI 1n ercord,wK' w 1h II R<;CS R tlr*rtion Prol Cll()f1 Progrom Monuol nd lllndo Colibro 111, ccordanc th ANSI N SL 2540 I 199-1 l t Survey Unit STR-104 Page 28 of35 Containment Vessel (CV) - 4th Level (C Deck)

S1vANNA11 Technical Staff Survey Unit Release Record Callbratlon Certlllcate

  • ID Number: 25017651000 -20240305
  • 1 RSCS Customer: Matthew G Hunter Instrument Serlal Number Radiation Safety & Control Services Inc Ludlum Model 3002 25017651 93 Ledge Road Probe Model Serial Number Seabrook NH 03874 Lud'um 43-93 312635 Precision Check Test1 I

Test2 I

Tst3 I

Mean I

Results 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 #

PuIHr98756 AUTO 5 Kcpm #

5 Kcpm #

AUTO 05Kcpm#

0 5 Kcpm t:

Readings wl1h

  • Indicate ranges where As-Found readings are >20% of Target value.

Readings with ** indicate As-left readings are >1 0% ofTarget value.

Readings with# Indicate ranges were calibrated using a pulser Probe Isotope 4 3.93 312635 Tc-99 43-93 312635 Cs-137(Beta) 43-93 312635 Cs-137(Beta) 43-93 312635 Tc-99 43-93 312635 Cs-137(Beta) 43-93 312635 Tc-99 43-93 312635 Cs-t37(Beta) 43-93 312635 Tc-99 Physical Checks Light Check of Scintilabon Probes: Pass Outer Physical Chee

  • Pass Tap Test Pass Audio Function Check; Pass Comments*

Customer Equipment ID Calibrated By Nicole Wedlg Efflclencv NIST Source ID 0.0249 C/0 (4 Pi) 127356 Tc-99 0.0546 C/0 (4 Pl) 127357 Cs-137(Beta) 0.0471 C/0 (4 Pl) 127357 Cs-137(Beta) 0.0193 CID (4 Pl) 127356 Tc-99 0.1693 CID (4 Pl) 127357 Cs-137(8eta) 0.0876 CID (4 Pl) 127356 Tc-99 0.1 237 CID (4 Pl) 127357 Cs-1 37(Beta) 0.0537 CID (4 Pl) 127356 Tc-99 Electronics Checks High Voltage QC Revle,., By Matthew Hunter Ah twnc cono,

s. Tempf,1 *u, 7 t 1 F Hun dny 36 O ion tuc Pr

, 30 2!1 in.1,g 5 Kcpm #

Pulser 98756 05Kcpm#

Pulser 98756 Geometrv 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 3/4" Above Source Flat Surface 3/4" Above Source As Found As Left 710 Vo s 775 Volts Date Mar 05, 2024 Expires Mar 05 2025 QC Date* Mar OS. 2024 In toklrnnce condlllons or sed on test results la! ng,.,lhm specrlied t,mrts wrth no reducuon by the uncer1a*nty of Oie me rement Unless olher..ise Sla!ed thlS collbrallon was performed by RSC
  • 93 Ledge Rd

_obrook NI I ut!lamg the follow nq 1ST l rnceoble sources

Pulse, 756

( I Due Oct 31 2024) edlq The repon 1nty of measurement 1s s1111 os lhe st.:tndord unce Intv of measurement mutt1plled by the coveroQe I or k such th t tha cov *r lo opp,oximo!Aly 'i0 lions po,to, mod,n ANSI N323AB 20 t 3 RSCS Now H m l~U R J CbV8 RSCS c I hr *nn R<;CS Rodi >tim P101t tonn Prog, m ~,muol nn<l

,n. roordc,nc with AN I

  • I l' t 1994 y ANAB ond m ets lhe reqwements or I _ 0/l[C t 7025 20 t7 \\\\1ltle demon uat,ng lechnlcal compel n,e,n lhe held of Acer llnt<>n AC.;,o79 kl< inlonMuon on he lVf'8S ot

,brot,ons to which this occred11auon pr,1, I -

b Fi Survey Unit STR-1 04 Page 29 of35 Containment Vessel (CV)* 4th Level (C Deck)

SAVANNAHTechnical Staff Survey Unit Release Record - Static Data Count Rate Total Weighted Eff Meter ID Measurement ID (cpm)

(c/d) 25035132 STR-104-01 116 0.0858 25035132 STR-104-02 134 0.0858 25035132 STR-104-03 98 0.0858 25035132 STR-104-04 134 0.0858 25035132 STR-104-05 110 0.0858 25035132 STR-104-06 106 0.0858 25035132 STR-104-07 91 0.0858 25035132 STR-104-08 108 0.0858 25035132 STR-104-09 372 0.0858 25035132 STR-104-10 106 0.0858 25035132 STR-104-11 93 0.0858 25035132 STR-104-12 123 0.0858 25035132 STR-104-13 117 0.0858 25035132 STR-104-14 112 0.0858 25035112 STR-104-15 82 0.0151 25035134 STR-104-16-J 804 0.0159 25035134 STR-104-17-J 98 0.0159 25035134 STR-104-03-D 72 0.0920 Note: Meter ID 25035132, 25035112, and 25035134 are connected to a Ludlum model 43-93 detector with an area of 100 cm2.

Survey Unit STR-104 Page 30 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAHTechnical Staff Survey Unit Release Record Meter ID 25035113 25035118 25017651 25035132 25017651 25035132 25017651 25035134 25035118 25035112 25035134 25035112 25035134 25035134 25035147 25035147 - Scan Data Min/Max Range Average Location (cpm)

(cpm)

SA-01 50/185 117.50 SA-01 200/410 305.00 SA-01 70/380 225.00 SA-01 70/850 460.00 SA-01 80/156 118.00 SA-01 50/280 165.00 SA-01 68/210 139.00 SA-02 100/180 140.00 SA-02 180/270 225.00 SA-03 35/70 52.50 SA-03 75/100 87.50 SA-04 70/170 120.00 SA-04 60/120 90.00 SA-05 120/290 205 SA-05 86/192 139 SA-05 60/2300 1180 Total Weighted eff (c/d) 0.0802 0.0655 0.0642 0.0632 0.0642 0.0632 0.0642 0.0142 0.0113 0.0135 0.0142 0.0135 0.0142 0.0142 0.0151 0.1317 Note: Meter ID 25035113 and Meter ID 25035118 are connected to a Ludlum model 43-37 detector with an area of 584 cm2. Meter ID 25035112, Meter ID 25035132, Meter ID 25035134, Meter ID 25035147, and Meter ID 25017651 are connected to a Ludlum model 43-93 detector with an area of 100 cm2.

Survey Unit STR-104 Page 31 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAH Technical Staff Survey Unit Release Record 1 - - -d b Yi - Quality Control Assessment Measurement Value (dpm/100 cm2}

Initial measurement 1142.78 Replicate measurement 782.60 Average 962.69 Absolute Value of the difference 360.18 Condition Absolute value of the Control Limit (dpm/100 cm2) difference (dpm/100 cm2)

Result Average< 52,300 360.18 11087.6 Pass Survey Unit STR-104 Page 32 of35 Containment Vessel (CV) - 4th Level (C Deck)

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

( dpm/100 cm2)

(dpm/100 cm2)

STR-104-01 1352.68 68347.32 STR-104-02 1562.57 68137.43 STR-104-03 1142.78 68557.22 STR-104-04 1562.57 68137.43 STR-104-05 1282.71 68417.29 STR-104-06 1236.07 68463.93 STR-104-07 1061.15 68638.85 STR-104-08 1259.39 68440.61 STR-104-09 4337.89 65362.11 STR-104-10 1236.07 68463.93 STR-104-11 1084.47 68615.53 STR-104-12 1434.30 68265.70 STR-104-13 1364.34 68335.66 STR-104-14 1306.03 68393.97 STR-104-15 5431.04 64268.96 STR-104-16-J 50660.35 19039.65 STR-104-17-J 6175.02 63524.98 Parameter Result Number of Measurements 17 NumberofS+

17 Critical Value 12 Meets I Doesn't Meet Acceptance Criteria Meets Survey Unit STR-104 Containment Vessel (CV) - 4th Level (C Deck)

Sign

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

' +1

+1

+1

+1

+1 Page 33 of35

SAVANNAH Technical Staff Survey Unit Release Record - Graphical Presentations Quantile Plot of Gross Activity Concentration 55300 50300 45300

,-... 40300 N s g 35300 0..... 8 30300

.g.

';; 25300 s:::

0 U 20300

(.)

<t'. 15300 10300 5300 300 * * *

  • 0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Note: Gaps between data points are due to measurements with the same value. See Table 7-1.

Survey Unit STR-104 Page 34 of35 Containment Vessel (CV) - 4th Level (C Deck)

SAVANNAHTechnical Staff Survey Unit Release Record Histogram Survey Unit Number: STR-104 Containment Vessel (CV)

Survey Unit Name: - 4th Level (C Deck) 18 16 14 12

>,. g 10 Q)
:s C"

Q) 8 lo.

µ,.

6 4

2 0

7261 13461 19661 25861 32061 38261 Upper end alue (dpm/100 cm2)

Survey Unit STR-104 Containment Vessel (CV) - 4th Level (C Deck) 44460 50660 Page 35 of35

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