ML25328A179

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Us Dept of Transportation - Nuclear Ship Savannah, Survey Unit Release Record Survey Unit STR-301 Navigation Bridge Deck - Interior Surfaces
ML25328A179
Person / Time
Site: NS Savannah
Issue date: 11/20/2025
From: Hollenbeck P
US Dept of Transportation, Maritime Admin, Nuclear Ship Support Services
To:
Office of Nuclear Reactor Regulation
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Download: ML25328A179 (0)
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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-301 Navigation Bridge Deck-Interior Surfaces Appmved: ~

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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-301 Navigation Bridge Deck - Interior Surfaces Pete Hollenbeck Pete Hollenbeck, CHP D. Roberson Doug Roberson Digitally signed by Pete Hollenbeck Date: 2025.04.17 16:34:22 -04'00' Date Digitally signed by D. Roberson Date: 2025.04.21 07:40:39-05'00' Date Soeuth Caleb Soeun DigitallysignedbySoeuthCalebSoeun Date: 2025.04.23 09:28:1 0 -04'00' Soeuth C. Soeun James Reese, CHP, RRPT James Reese Date Digitally signed by James Reese, CHP, RRPT Date: 2025.04.23 11 :35:58

-07'00' Date Dan

  • 1 e I R M
  • 1 ha 1
  • 1 k Digitally signed by Daniel R. Mihalik Date: 2025.04.24 09:21 :15 -04'00' Daniel Mihalik John Osborne LCM John Osborne 4/24/2025 Submitted Date Digitally signed by: John Osborne LCM DN: CN = John Osborne LCM email

= jmosbome@nsss.llc C = AD Date: 2025.05.13 11 :35:49 -05'00' Date 5/2/2025 Approved Page 2 of33

SAVANNAHTechnical Staff Survey Unit Release Record TABLE OF CONTENTS

1.

EXECUTIVE

SUMMARY

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

2.

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

3.

CLASSIFICATION BASIS................................................................................................... 6

4.

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

5.

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

6.

SURVEY IMPLEMENTATION......................................................................................... 12

7.

SURVEY RESUL TS............................................................................................................. 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................................................................................................................. 18 Survey Unit STR-301 Page 3 of33 Navigation Bridge Deck - Interior Surfaces

SA VANNAH Technical Staff Survey Unit Release Record LIST OF TABLES Table 4-1-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-301 Random Measurement Designations.................................................... 11 Table 5 Scanning Coverage................................................................................................. 12 Table 5 Investigation Levels................................................................................................ 12 Table 7 Summary of Random, Judgmental, and QC Static Measurements.................... 14 Table 7 Basic Statistical Properties of Static Measurement Population.......................... 15 Table 7 Scan Measurement Summary................................................................................ 15 Survey Unit STR-301 Page 4 of33 Navigation Bridge Deck - Interior Surfaces

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 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-301 Navigation Bridge Deck - Interior Surfaces 1 -. -- - bst Page 5 of33

SAVANNAH Technical Staff Survey Unit Release Record

1.

EXECUTIVE

SUMMARY

1 - -

-- ::i:

kzt This Survey Unit Release Record for survey unit STR-301, Navigation Bridge Deck -

Interior Surfaces, 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 3. 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 (P) decision error rates were set at 0.05. As a random measurement population, seventeen (17) static beta measurements were acquired from the survey unit.

In addition, two judgmental static beta measurements were acquired. Surface scanning was performed on approximately 14% of the accessible total surface area in the survey unit.

The data assessment results for survey unit STR-301 show that the maximum gross activity concentration among random and judgmental measurements is equal to 1,035.85 dpm/100 cm2, which is 1.98% 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-301 is acceptable for unrestricted release. The mean gross activity concentration among the random and judgmental measurements is equal to 593.08 dpm/100 cm2, which is 0.85% of the 15 mrem/y gross activity DCGLw of 69,700 dpm/100 cm2. The mean gross activity concentration is equal to 0.13 mrem/y for the survey unit.

2.

SURVEY UNIT DESCRIPTION STR-301 is an impacted Class 3 survey unit. The Navigation Bridge Deck contains the pilot house, gyro, radio and chart rooms. It also has fan rooms, battery rooms and an emergency generator room. Based upon Computer Aided Design drawings, the deck surface area is approximately 290.55 square meters (290.55 m2). The total surface area, including the bulkheads and overhead, is approximately 1,574.69 m2. Refer to Attachment 1 of this report for figures and maps depicting survey unit STR-301.

3.

CLASSIFICATION BASIS Based on the NSS Historical Site Assessment [HSA] [5], survey unit STR-301, identified as survey unit 301Al in the HSA, was identified as a Class 3 survey unit. Background radiation levels and contamination levels less than the MDC were documented in Table C-l for the Navigation Bridge Deck in the HSA. For a Class 3 survey unit, the expectation is Survey Unit STR-301 Page 6 of33 Navigation Bridge Deck-Interior Surfaces

SAVANNAH Technical Staff Survey Unit Release Record that any residual radioactivity will be a small fraction of the DCGL. No Turnover or Remedial Action Support Survey was performed. Completing the final Survey Unit Classification Worksheet, the correct final classification of survey unit STR-301 met the requirements of Class 3.

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-301 did not exceed the release criteria specified in the LTP 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 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-60surrogatc, 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.

Survey Unit STR-301 Page 7 of33 Navigation Bridge Deck - Interior Surfaces

SA VANNAH Technical Staff Survey Unit Release Record 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 1.63E-02 Ni-63 5.40E+-O0 9.00E-01 9.00E-01 Sr-90 9.22E-06 1.54E-06 Tc-99 1.27E-04 2.1 IE-05 Ag-108m 8.30E-04 1.38E-04 Cs-137 4.57E-01 7.61E-02 7.61E-02 H-3 l.93E-03 3.21E-04 Fe-55 8.I0E-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 l.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:

DCGL DCGLETD X DCGLHTD surrogate =

(/ HTD:ETDXDCGLETv)+DCGLHTD Where:

DCGLETD = the DCGL for the easy-to-detect radionuclide DCGLHm the DCGL for the hard-to-detect radionuclide Survey Unit STR-301 Navigation Bridge Deck - Interior Surfaces Equation 1 Page 8 of33

SAVANNAH Technical Staff Survey Unit Release Record FHTn: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-60 surrogate= 2.37E + 04 X (

)

E

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

Where:

n DCGLn 1

Gross Activity DCGLw = ti h

In DCGL1 + DCGLz +... DCGLn 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-13 7 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 Re-sum of and Cs-137 normalized Nuclide fractions Fractions Fractions C-14 5.61E-03 Co-60 1.63E-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 1.35E-03 Am-241 9.66E-08 Pu-239/240 8.0lE-08 Totals 1.00E+o0 9.24E-02 l.00E+00 Survey Unit STR-301 Page 9 of33 Navigation Bridge Deck - Interior Surfaces

SAVANNAH Technical Staff Survey Unit Release Record 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 = 176E-l 8_24E-l = 6.97E+04 dpm/100 cm2*

2.~6E+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 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 MD Cs were less than 50% of the DCGL.

5.

SURVEY DESIGN The L TP 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 /)Jcr exceeds three (3), then the value of two (2) will be used for Ncr.

Survey Unit STR-301 Page 10 of33 Navigation Bridge Deck - Interior Surfaces

SAVANNAH Technical Staff Survey Unit Release Record When no RASS or Turnover survey has been performed, STS-005-031 states to set the DCGL to 1, the LBGR to 0.5 and sigma to 0.3. The relative shift for survey unit STR-301 was calculated as follows:

1-0.5 Relative Shift = -- = 1. 7 0.3 Both the Type I error, or a value, and the Type II error, or ~ 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 seventeen (17). Seventeen (17) total random measurements were used in the survey design for survey unit STR-301.

The survey unit was designated Class 3; therefore, the measurement locations were selected based on a random grid with a random starting point. The random locations of the static measurements were selected using Visual Sample Plan (VSP). Input parameters included the use of survey unit drawings, and the random sampling tool set with a predetermined number of measurement locations. The random measurement locations were identified in the field using dimension parameters provided on the survey unit map (see Attachment 1).

Table 5-1 lists the random measurements to be collected for FSS of survey unit STR-301.

Table 5-l-STR-301 Random Measurement Designations Label LX(m) LY(m)

Sample Area Surface STR-301-01 0.60 0.06 Emergency Gen. Rm.

Overhead STR-301-02 3.93 1.08 Emergency Gen. Rm.

Bulkhead 1 STR-301-03 0.91 1.10 Fan Rm. #2 Overhead STR-301-04 1.35 0.47 FanRm.#1 Bulkhead 3 STR-301-05 0.39 3.30 Area 11 Deck STR-301-06 4.60 0.47 Passageway Deck STR-301-07 1.83 1.38 Passageway Bulkhead 1 STR-301-08 1.64 0.16 Area 1 Bulkhead 1 STR-301-09 0.62 1.03 Machinery Casing Deck STR-301-10 0.93 1.96 Area 13 Overhead STR-301-11 1.84 7.94 Pilot House Overhead STR-301-12 0.25 0.32 Area 16 Bulkhead 3 STR-301-13 0.70 2.10 Area 17 Overhead STR-301-14 2.20 0.62 Radio Rm.

Bulkhead 3 STR-301-15 0.20 1.23 Area8 Bulkhead 4 STR-301-16 1.90 0.01 Chart Rm.

Bulkhead 3 STR-301-17 0.03 2.52 Area4 Overhead 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-301-17 was chosen for the replicate measurement. In Survey Unit STR-301 Page 11 of33 Navigation Bridge Deck - Interior Surfaces

SA VANNAH Technical Staff Survey Unit Release Record hzt 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 random 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-301-18-J and STR-301-19-J. Those locations would be documented on the field forms.

For this Class 3 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 3 Judgmental For survey unit STR-301, 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. The survey package also called for a 2-foot radius to be scanned around each static measurement location. Ten percent of the total surface area was planned to be scanned. Refer to for figures and maps depicting the measurement and scan locations in survey unit STR-301.

For this Class 3 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.

Table 5 Investigation Levels Survey Unit Fixed Measurements Scan Measurements Classification Class 3

> 0.25 x Operational

> 0.25 x Operational DCGLw DCGLw 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 of 1,300 cpm when scanning, approximately equal to 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 IMPLE:MENTATION For survey unit STR-301, 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 Survey Unit STR-301 Page 12 of33 Navigation Bridge Deck - Interior Surfaces

SAVANNAHTechnical Staff Survey Unit Release Record

) - - -- dt

} pj 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 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-301-00-00, which included DQOs, survey design, detailed FSS instructions, survey maps and survey forms. FSS field activities were projected to take five (5) 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 four days to complete and was performed between August 6, 2024, through August 12, 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.

Sixteen (16) of the seventeen (17) random static measurement locations were marked based on the dimensions provided on the survey maps. One location, STR-301-09, was moved from the Machinery Casing room to the Passageway due to the presence of loose asbestos in the Machinery Casing room. 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.

Nine of the eleven planned scan areas, SA-01 through SA-05 and SA-08 through SA-11, were scanned at the locations provided on the survey maps. Scan areas SA-06 and SA-07 were planned to be taken in the Machinery Casing room. Both of those scan areas were moved to the Passageway due to the presence of loose asbestos in the Machinery Casing room. A 2-foot radius around each static measurement location was also scanned, resulting in approximately 14% of the total surface area being scanned. The total scan area meets the scan coverage requirements for a Class 3 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 0.75 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-301-17 and identified as STR-301-17-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.

Survey Unit STR-301 Page 13 of33 Navigation Bridge Deck - Interior Surfaces

SAVANNAH Technical Staff Survey Unit Release Record

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 1-minute count was 164 cpm and was rounded up to 175 cpm. The contact detector weighted efficiency is equal to 0.1530 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 measurements equal to 421.6 dpm/100 cm2

  • This value is less than 1% of the operational DCGLw and Gross Activity DCGLw. Table 7-1 presents the activity concentration for all static measurements.

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

STR-301-01 543.68 STR-301-02 583.74 STR-301-03 509.34 STR-301-04 480.73 STR-301-05 669.58 STR-301-06 578.02 STR-301-07 560.85 STR-301-08 526.51 STR-301-09 371.99 STR-301-10 658.14 STR-301-11 669.58 STR-301-12 583.74 STR-301-13 629.52 STR-301-14 572.29 STR-301-15 560.85 STR-301-16 572.29 STR-301-17 532.23 STR-301-18-J 1035.85 STR-301-19-J 629.52 STR-301-17-D 1143.87 The raw static data with detector efficiencies are presented in Attachment 3.

Survey Unit STR-301 Page 14 of33 Navigation Bridge Deck - Interior Surfaces

SAVANNAH Technical Staff Survey Unit Release Record 1-*jf *-- bst 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 371.99 dpm/100 cm2 Maximum Measurement 1035.85 dpm/100 cm2 Mean 593.08 dpm/100 cm2 Median 572.29 dpm/100 cm2 Standard Deviation 128.47 dpm/100 cm2 Coefficient of Variation 0.22 unitless Residual activity dose rate 0.13 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-301, the calculated dose from residual activity is 0.13 mrem/yr.

Calculation of the scan MDC for the Ludlum 43-93 detector used the highest rounded count rate of 125 cpm, a distance of0.75 inches, and the non-painted detector weighted efficiency of 0.1244 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 non-painted surfaces is 1,223.0 dpm/100 cm2. This value is 2.3% of the operational DCGLw and 1.8% of the gross activity DCGLw.

Calculation of the scan MDC for the Ludlum 43-37 detector used the rounded count rate of 400 cpm, the detector weighted efficiency of 0.1297 c/d at a distance of 0. 75 inches and using L TP Equation 5-8, which was derived from NUREG-1507. The elevated area was assumed to be a 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 is 473.5 dpm/100 cm2. This value is less than 1 % of the operational DCGLw and the gross activity DCGLw.

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-01 377.92 - 1407.13 892.53 SA-02 361.83 - 1399.09 880.46 SA-03 337.71 - 1109.62 723.67 SA-04 377.65 - 573.08 475.37 SA-05 249.26 - 1270.44 759.85 SA-06 345.75 - 1157.87 751.81 Survey Unit STR-301 Page 15 of33 Navigation Bridge Deck - Interior Surfaces 7

SAVANNAH Technical Staff Survey Unit Release Record Scan ID SA-07 SA-08 SA-09 SA-10 SA-11 STR-301-01 STR-301-02 STR-301-03 STR-301-04 STR-301-05 STR-301-06 STR-301-07 STR-301-08 STR-301-09 STR-301-10 STR-301-11 STR-301-12 STR-301-13 STR-301-14 STR-301-15 STR-301-16 STR-301-17 STR-301-18-J STR-301-19-J Low to High Range

{dpm/100 cm2) 257.3 - 1270.44 466.36 - 1326.72 426.16 - 1383.01 359.16 - 1025.99 787.99 - 1334.77 410.08 - 1021.18 731.71 - 1350.85 474.4 - 820.16 418.12 - 1045.3 562.85 - 1141.79 426.16 - 1664.44 466.36 - 1238.28 498.53 - 1165.91 184.94 - 1045.3 482.45 - 964.89 747.79 - 1696.6 466.36 - 1093.54 546.77 - 1222.2 586.98 - 1366.93 434.2 - 1045.3 345.75 - 916.65 498.53 - 1230.24 739.75 - 1616.19 506.57 - 1447.34 Average

{dpm/100 cm2) 763.87 896.54 904.59 692.58 1061.38 715.63 1041.28 647.28 731.71 852.32 1045.3 852.32 832.22 615.12 723.67 1222.2 779.95 884.49 976.96 739.75 631.2 864.39 1177.97 976.96 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-301-17-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.

The results of the evaluation of the quality control measurement shows agreement between the original and duplicate measurements. See Attachment 4 for the results.

Survey Unit STR-301 Page 16 of33 Navigation Bridge Deck - Interior Surfaces

SAVANNAH Technical Staff Survey Unit Release Record

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-301 has met the DQOs of the FSS package. The survey unit is properly classified as Class 3.

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-301 is 0.13 mrem/yr TEDE, based on the mean activity of measurements used for non-parametric statistical Survey Unit STR-30 l Page 17 of33 Navigation Bridge Deck - Interior Surfaces

SAVANNAHTechnical Staff Survey Unit Release Record sampling.

Survey unit STR-301 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 (MARS SIM), 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 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".

16.

ATTACHMENTS - Figures and Maps - Calibration Records - Static and Scan Data - Quality Control Assessment - Sign Test - Graphical Presentations Survey Unit STR-301 Navigation Bridge Deck - Interior Surfaces Page 18 of33

SAVANNAJt Technical Staff Survey Unit Release Record Survey Unit STR-301 Navigation Bridge Deck - Interior Surfaces - Figures and Maps Location of the Navigation Bridge Deck 1 - -- - rzt

\\ L Page 19 of33

SA VANNAJ-1 Technical Staff Survey Unit Release Record Navigation Bridge-Interior Surfaces Random and Judgmental Static Locations T -

- I - TI E

-m: 6

,iffi-" 1-01 STR-101-0i VSP Origin Point in Ship Coordinates:

Area 11 Frame 145 9'8" to Starboard Side of Centerline 77'0" above baseline Area 13 Frame 148 19' 11" to Starboard Side of Centerline 77'0" above baseline Survey Unit STR-301 Navigation Bridge Deck - Interior Surfaces E E E

LEGE O*

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STR-JOl-11 LT H

E VSP Origin Point in Ship Coordinates:

Arca 17 Frame 137 22*g** to Starboard Side of Centerline 77'0" above baseline Area4 Frame 141 13 '3" to Port Side of Centerline 77'0" above baseline Page 20 of33

SA VANNAJJ Technical Staff Survey Unit Release Record Navigation Bridge-Interior Surfaces Scan Areas l(t<

~ '

.J VSP Origin Point in Ship Coordinates:

Frame 162 On Centerline 77'0" above baseline "LAN Fl Survey Unit STR-301 Navigation Bridge Deck - Interior Surfaces Page 21 of33

SA VANNA!, Technical Staff Survey Unit Release Record LEGE D Survey Unit STR-301 Bui h~ 1 Navigation Bridge Deck - Interior Surfaces OTES.

STR-301-1 VSP Origin Point in Ship Coordinates:

Frame 129 14'4" to Starboard Side of Centerline 77'0" above baseline S '1 LE OCATIONS CREATED I VISUALS tP E NJ BER OF SA lPLES 17 PLACEJ,*E 1

OD t DO,

STAR- _oc RANDO, E-3 Page 22 of33

SA VANNA/I Technical Staff Survey Unit Release Record tilt,t I

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,, Ji Survey Unit STR-301 D I

.. ~- u I VSP Origin Point in Ship Coordinates:

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77'0" above baseline OTES*

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Navigation Bridge Deck - Interior Surfaces BOW h, Page23 of33

SA VANNA! 1 Technical Staff Survey Unit Release Record LEGEND:

Survey Unit STR-301 Navigation Bridge Deck - Interior Surfaces VSP Origin Point in Ship Coordinates:

Frame 152 6'2" to Port Side of Centerline 77'0" above baseline A !PLC Pl.A BOW Fl Page 24of33

S1 v ANNAJJ Technical Staff Survey Unit Release Record - Calibration Records C~hbr~tion Cenlfic;1te

  • ID Number: 250351120DO - 20240606

Instrument

& Conuol Sen.rces Inc 93 Le<lge Road Luell#TI I, I 3002 sen~, Number 25015112 Seri~! Number 421417 Se ~ Nit 0387~

T s I Tesl2 Probe-I LUOll.11143-93 Precision Check T

Mean 5.00 kcpm 4.99 kcpm 4.99 kcpm 4.99 kcpm Accuracy Check Ra Value

---'As"-'-Fou=nd;.;;... _ __,f----As=L=----1 ___ sour=-'c~e-'l~D--~

AUTO 500 Kcpm =

500 Kcpm ;;

Pulser 98756 AUTO 50 Kcpm ;,

SO Kcpm II Pulser 987 AUTO Kcpm F 5 Kcpm #

Plf<;er 987 AUTO O 5 Kcpm" 0 499 K 11 PUiser 98756 Readings with

  • Ill<!

te rang.,s where As-Found readings are >20'lr. 01 Target v Readings with " Ind1ca e As-left read,ngs are >10-,. of Target value Readings with,. d1cate ranges w re cahbra'e<l using a putseI Prob*

Isotope Efficiency NIST Soine ID 43.93 J21417 Cs-1371Beta) 0 1901 Cltl(4 P1) 127357Cs-1371Betil) 43 93 4214 t7 Tc-9'3 0 1028 CID (4 Pl) 127356 Tt-99 93421J17 Tc-99 0 0699 CID (4 Po 127356 Tc-99 43-93 421417 Cs 137(Beta 0 1360 C/0 (4 Pi) 127357 Cs I37(Betil) 43-93421417 Cs-137(Bet,II 0 0167 CID (4 Pi) 127 57 Cs-1371 till 43-93 421417 Tc-99 0 0076 CD (4 Pi) 127356 Tc-99

~3421417 Tc-99 0 0056 C/0 ( Pi) 127356 TC-99 43-93 4214 17 ~

137(""B-"e"-ta-'-l --'0-'0-'1-'-52;;...;.Cltl

..;...c(c.4_Pi-') __

..;.7_3-'5_7....;C_s-_I_37....:1'-Be_ta

__,_)

P lc:.al Checks Light Check of SCJnuia* on Probes Pass OUler Physical c I1e Pass Tap Tes Pao;s Audio Function c Pass Cord dieck Pass oone,s,ng 1 5* 1111c Custaner Equ pmen* ID hbra!ed B N COi Wedlg IQh oltage inl1lo Geometry Comment Flat Surface On Contact F l SUtfJC on contact F tSUtface 3'4" e Source F t Sotface 3'4" Abov Source F ~t Sotf r.e on te Flat Sotface ClflGra:e F t SUtfJc t Sotface 314* AboVe Grate As Found As left ~

704 Volts 7

Volts D.i1e Jun 06, 2024 res Jun 06, 2025 C

le Jun 06. 202~

by II'...certa f of the ent There the

_ SU' t ~

1 l.tle C.-e,aoe 1J

~ SUCh th31 In<

I !

\\ Pi Survey Unit STR-301 Page 25 of33 Navigation Bridge Deck - Interior Surfaces

S1 YANNA11 Technical Staff Survey Unit Release Record Colllbr.ition ceniflc.iie

  • ID Number: 25035118000
  • 20240606
  • r R.i a '"" S..1fe Control Serv ces In 93 Ledge Road Seabrook NH 03874 lnstrum*nt Ludl m r.lodel 3002 Probe Mod*I L

lum43-37 Precision Check S*n:11 Numbu 25035118 Senal Number 281 3

Test I I

Test2 I

Test3 I

Mean I

Results 4.99 kcpm I

5.01 kcpm I

5.00 kcpm I

5.00 kcpm I

Accuracy Check RanQe Target Value As Found As Len AUTO 500Kcpm#

500Kcpmli 500Kcpm#

AUTO 50 Kcpm#

-199Kcpmtt 499Kcpm#

AUTO 5 Kcpm" 4 99Kcpm=

4 99Kcpmtt AUTO 05Kcpm#

0501 Ktpmir 0501 Kcpm #

Read,ogs wttn

  • Ind cate ranges where As-Found readings are 20* ol large value Read s with ** md,cate As-le read ngs are > HJ*,. of Target v Read SWI 11 1nd1ca e rang
y. re l1brated using a pulser Probe Isotope Efficiency NIST Source ID Geometry 37 810J3 Tc-99 0 1071 D(-1 Pl)

I 7356 Tc-99 Fl.lt Surface 43.37 281 3

cs 137(8£:1.l) 0 13-15 0 (4 Pl) 127357 Cs 137(Beta)

Flat SurfJCe 37 281043 Tc-99 43-37 281043 Cs-137 Beta) 43-37281043 Tt-99 43-37 28 IOJJ Cs 137\\Be )

43-37 281043 Tc-99 37281043 Cs-1371Beta)

Ph Sic.II Checks Outer Ph) s!Cal Check Pass Tap Tes Pass Aud FooctlOO Checl< p s

cord check Pass lion Date Set Pass 0 0073 D (-1 Pi) 127356 Tc-99 00 121CD(-IP1) 127357 Cs-137(Beta) 0 1544 D (J P1) 127356 Tc-99 0 1751 D( Pl) 1273',7 Cs 137\\B 0011300(4 Pl) 127356 Tc-99 0.0 136 D(4P1) 127357 Cs-137\\Bela)

Electronics CheckS H1 Comments Effioenc,es perfOITTled usu)Q I 5" fiberglass grate as requested Flat Surface Fial Surface FIJI Surface F I urface Flat Surface Fial Surface As Found 1751 Volts P:tSS Source ID Pulser 98756 Pulser 98756 Pulser 98 7 56 Pulser 98756 Comment

i.-1* A!Jove Source 3 J" N.)Ove source 314" Abo~e Grate 3/4" ~e Grate on source On sour On Grate On Grate As Left 1800 Volts Cu omer Equ*pmem ID Calibrated By N a>I IQ OC Revie B Mantle\\*

Hunter Da:e. Jun 06. 2024 Expires Jun 06. 20 5 QC Date Jun 06. 2024 71 o "F Hulllld,ty 5~ o 'II, 83ro-emc Pre=e29 Ir ;,1_ illlte c st re t, I '111',1 hi' n. c,r*. I

-,.,u, ro,~JUc oon c31

.VJS pertonned by RSCS D &l Leooe Rd Se.11lroo p

I A"'9docur,-.,nts tn3C~WI' S,CSL Z5-10-1-1 I ca, f:>Ull!

le sources t '1or ucn I 2 h rl Survey Umt STR-301 Page 26 of33 Navigation Bridge Deck - Interior Surfaces

S1 v ANNAJ, Technical Staff Survey Unit Release Record l - -- d hr C Jib<all I Cer1iri t

  • ID N~1mbcr. 250351 3200() 20240 05. t RSCS 43 T

11 5.00 k~p!TI Ra AUTO AUTO AUi Probe 3 42*42!1 43 93 42 1426 43-9

.t21 2

( 3-421.<tl 43 J

  • 21 42 0 1

, 1 Precision Check T ll 4.0D cpm Accuracy Check 127357 Ca 1 12 J Cs*

12 43 93 42 147 0 1108 C'D 4 P1I t ';-

4;>1 2!;

C 11 3CJO P )

4l-3 42 1425 0 082 Comm IS" Calibrated \\\\ 'h 2(/ C ID C eah om r t:qu prnert,0 Survey Umt STR-301 Navigation Bridge Deck - Interior Surfaces CIO ( P J n I Mum r

I/_

Page 27 of33

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

(c/d) 25035112 STR-301-01 95 0.1747 25035112 STR-301-02 102 0.1747 25035112 STR-301-03 89 0.1747 25035112 STR-301-04 84 0.1747 25035112 STR-301-05 117 0.1747 25035112 STR-301-06 101 0.1747 25035112 STR-301-07 98 0.1747 25035112 STR-301-08 92 0.1747 25035112 STR-301-09 65 0.1747 25035112 STR-301-10 115 0.1747 25035112 STR-301-11 117 0.1747 25035112 STR-301-12 102 0.1747 25035112 STR-301-13 110 0.1747 25035112 STR-301-14 100 0.1747 25035112 STR-301-15 98 0.1747 25035112 STR-301-16 100 0.1747 25035112 STR-301-17 93 0.1747 25035112 STR-301-18-J 181 0.1747 25035112 STR-301-19-J 110 0.1747 25035132 STR-301-17-D 175 0.1530 Note: Meter IDs 25035112 and 25035132 are connected to a Ludlum model 43-93 detector with an area of 100 cm2.

Survey Unit STR-301 Page 28 of33 Navigation Bridge Deck - Interior Surfaces

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

(cpm) 25035112 SA-01 47/175 111 25035112 SA-02 45/174 109.5 25035112 SA-03 42/138 90 25035118 SA-04 286/434 360 25035112 SA-05 31/158 94.5 25035112 SA-06 43/144 93.5 25035112 SA-07 32/158 95 25035112 SA-08 58/165 111.5 25035112 SA-09 53/172 112.5 25035118 SA-10 272/777 524.5 25035112 SA-11 98/166 132 25035112 STR-301-01 51/127 89 25035112 STR-301-02 91/168 129.5 25035112 STR-301-03 59/102 80.5 25035112 STR-301-04 52/130 91 25035112 STR-301-05 70/142 106 25035112 STR-301-06 53/207 130 25035112 STR-301-07 58/154 106 25035112 STR-301-08 62/145 103.5 25035112 STR-301-09 23/130 76.5 25035112 STR-301-10 60/120 90 25035112 STR-301-11 93/211 152 25035112 STR-301-12 58/136 97 25035112 STR-301-13 68/152 110 25035112 STR-301-14 73/170 121.5 25035112 STR-301-15 54/130 92 25035112 STR-301-16 43/114 78.5 25035112 STR-301-17 62/153 107.5 25035112 STR-301-18-J 92/201 146.5 25035112 STR-301-19-J 63/180 121.5 25035118 SA-10 283/396 339.5 j

Total Weighted eff (c/d) 0.1244 0.1244 0.1244 0.1297 0.1244 0.1244 0.1244 0.1244 0.1244 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 0.1244 0.1244 0.1244 0.1297 Note: Meter ID 25035112 is connected to a Ludlum model 43-93 detector with an area of 100 cm2. Meter ID 25035118 is connected to a Ludlum model 43-37 detector with an area of 584 cm2.

Survey Unit STR-301 Page 29 of33 Navigation Bridge Deck - Interior Surfaces

SAVANNAHTechnical Staff Survey Unit Release Record - Quality Control Assessment Measurement Value ( dpm/100 cm2)

Initial measurement 532.23 Replicate measurement 1143.87 Average 838.05 Absolute Value of the difference 611.64 Condition Absolute value of the Control Limit

( dpm/100 cm2) difference

( dpm/100 cm2)

Average < 52,300 611.64 11087.6 Survey Unit STR-301 Navigation Bridge Deck-Interior Surfaces Result Pass Page 30 of33

SAVANNAH Technical Staff Survey Unit Release Record - Sign Test Measurement Result DCGLw - Result ID (dpm/100 cm2)

(dpm/100 cm2)

STR-301-01 543.68 69156.32 STR-301-02 583.74 69116.26 STR-301-03 509.34 69190.66 STR-301-04 480.73 69219.27 STR-301-05 669.58 69030.42 STR-301-06 578.02 69121.98 STR-301-07 560.85 69139.15 STR-301-08 526.51 69173.49 STR-301-09 371.99 69328.01 STR-301-10 658.14 69041.86 STR-301-11 669.58 69030.42 STR-301-12 583.74 69116.26 STR-301-13 629.52 69070.48 STR-301-14 572.29 69127.71 STR-301-15 560.85 69139.15 STR-301-16 572.29 69127.71 STR-301-17 532.23 69167.77 STR-301-18-J 1035.85 68664.15 STR-301-19-J 629.52 69070.48 Parameter Result Number of Measurements 19 NumberofS+

19 Critical Value 13 Meets/ Doesn't Meet Acceptance Criteria Meets Survey Unit STR-301 Navigation Bridge Deck - Interior Surfaces Sign

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1

+1 Page 31 of33

SAVANNAH Technical Staff Survey Unit Release Record f - --

--- f rt - Graphical Presentations 1100 1000

§ 900 0 o 800 8

.§' 700 u § 600 u

~ 500 400 300 Quantile Plot of Gross Activity Concentration 0.0%

10.0%

20.0%

30.0%

40.0%

50.0%

60.0%

70.0%

80.0%

90.0%

100.0%

Survey Unit STR-301 Page 32 of33 Navigation Bridge Deck - Interior Surfaces

SAVANNAH Technical Staff Survey Unit Release Record Histogram Survey Unit Number: STR-301 Navigation Bridge Deck -

Survey Unit Name: Interior Surfaces 9

8 7

6 3

2 0

455 538 621 704 787 870 Upper end value ( dpm/100 cm2)

Survey Unit STR-301 Navigation Bridge Deck - Interior Surfaces 953 1036 Page 33 of33

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