ML25328A175

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Us Dept of Transportation - Nuclear Ship Savannah, Survey Unit Release Record Survey Unit SYS-112 Primary Pressurizing System (PE) Including Retained Portions of the Pressurizer
ML25328A175
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
References
Download: ML25328A175 (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 SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer 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 and COMPLIANCE MANAGER REVIEW /DATE:

SAFETY REVIEW COMMITTEE SUBMITTED/ APPROVED LICENSE TERMINATION PLAN MANAGER REVIEW/ DATE:

Survey Unit SYS-1 12 Primary Pressurizing System (PE) including retained portions of the Pressurizer Pete Hollenbeck Pete Hollenbeck, CHP D. Roberson Doug Roberson Soeuth Caleb Soeun Soeuth C. Soeun James Reese, CHP, RRPT James Reese Daniel R. Mihalik Daniel Mihalik John Osborne LCM John Osborne 5/12/2025 Submitted Eric Darois Digitally signed by Pete Hollenbeck Date: 2025.04.28 13:29:41 -04'00' Date Digitally signed by D. Roberson Date: 2025,04,28 1 3:03:09 -05'00' Date Digitally signed by Soeuth Caleb Soeun Date: 2025.04.29 07:54:02 -04'00' Date Digitally signed by James Reese, CHP, RRPT Date: 2025.04.30 07:50:20 -07'00' Date Digitally signed by Daniel R. Mihalik Date: 2025.04.30 15:25:54 -04'00' Date Digitally signed by: John Osborne LCM DN: CN = John Osborne LCM email

= jmosborne@nsss.llc C = AD Date: 2025.05.20 08:33:32 -05'00' Date 5/20/2025 Approved 9/2/2025 Date Page 2 of30

SAVANNAH Technical Staff Survey Unit Release Record TABLE OF CONTENTS 1

f rt

1.

EXECUTIVE

SUMMARY

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

2.

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

3.

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

4.

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

5.

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

6.

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

7.

SURVEY RESULTS............................................................................................................. 13

8.

QUALITY CONTROL........................................................................................................ 15

9.

INVESTIGATIONS AND RESULTS................................................................................ 16

10. REMEDIATION AND RESUL TS...................................................................................... 16
11. CHANGES FROM THE FINAL STATUS SURVEY PACKAGE................................. 16
12. DATA QUALITY ASSESSMENT...................................................................................... 16
13. ANOMALIES........................................................................................................................ 17
14. CONCLUSIONS................................................................................................................... 17
15. REFERENCES..................................................................................................................... 17
16. ATTACHMENTS................................................................................................................. 18 Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 3 of30

SAVANNAH Technical Staff Survey Unit Release Record LIST OF TABLES 1

Table 4 Radionuclide Fractions and Normalized Fractions............................................... 8 Table 4 15 mrem/y DCGLs for ROC and Ni-63.................................................................. 8 Table 5 SYS-112 Systematic Measurement Designations................................................. 11 Table 5 Scanning Coverage................................................................................................. 12 Table 5 Investigation Levels................................................................................................ 12 Table 7 Summary of Systematic,*Judgmental, and QC Static Measurements................ 14 Table 7 Basic Statistical Properties of Static Measurement Population.......................... 15 Table 7 Scan Measurement Summary................................................................................ 15 Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 4 of30

SAVANNAH Technical Staff Survey Unit Release Record LIST OF ACRONYMS AND ABBREVIATIONS ALARA As Low As Reasonably Achievable CR Contractor Report DQO Data Quality Objective DCGL Derived Concentration Guideline Level ETD Easy-to-Detect FSS Final Status Survey HSA Historical Site Assessment HTD Hard-to-Detect IC Insignificant Dose Contributors LBGR Lower Bound of the Gray Region L TP License Termination Plan MARAD Maritime Administration MARLAP Multi-Agency Radiological Laboratory Analytical Protocols MARSSIM Multi-Agency Radiation Survey and Site Investigation Manual MDC Minimum Detectable Concentration NSS Nuclear Ship SAVANNAH PE Primary Pressurizing System QC Quality Control ROC Radionuclides of Concern TEDE Total Effective Dose Equivalent UBGR Upper Bound of the Gray Region VSP Visual Sample Plan Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer 1 - --- +- bzst Page 5 of30

SAVANNAH Technical Staff Survey Unit Release Record

1.

EXECUTIVE

SUMMARY

t This Survey Unit Release Record for survey unit SYS-I I 2, Primary Pressurizing System (PE) including retained portions of the Pressurizer, has been generated in accordance with Maritime Administration (MARAD) procedure STS-005-035, Preparation of Survey Unit Release Records and FSS Final Reports, Reference (a) and satisfies the requirements of Section 5.10 of the Nuclear Ship SAVANNAH (NSS) License Termination Plan [L TP], STS-004-003, Revision 1, Reference (b ).

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, Reference (c), the NSS LTP, and with guidance from NUREG-1575, Revision I, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM), Reference (d).

This survey unit has a MARSSIM classification of Impacted. 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 systematic measurement population, seventeen (17) static beta measurements were acquired from the survey unit. In addition, two (2) judgmental static beta measurements were acquired. Surface scanning was performed on I 00% of the accessible total surface area in the survey unit. The data assessment results for survey unit SYS-112 show that the maximum gross activity concentration among all the final systematic and judgmental measurements is equal to 2,919.76 dpm/100 cm2, which is 16.5% of the operational Derived Concentration Guideline Level (DCGLw) value of 17,700 dpm/100 cm2.

Therefore, the null hypothesis of the Sign Test is rejected, and survey unit SYS-112 is acceptable for unrestricted use. The mean gross activity concentration among all the final systematic and judgmental measurements is equal to 664.22 dpm/100 cm2, which is 2.8%

of the 15 mrem/y gross activity DCGLw of 23,600 dpm/100 cm 2. The mean gross activity concentration is equal to 0.42 mrem/y for the survey unit.

2.

SURVEY UNIT DESCRIPTION The Primary Pressurizing (PE) System, including the Pressurizer itself, is described in the Updated Final Safety Analysis Report (UFSAR), Rev 13, Reference (e). The UFSAR states that all of the PE system equipment is dismantled and disposed, and that the Pressurizer itself is dismantled and disposed except for its upper shell and support skirt. This survey unit, designated SYS-112, is limited to the retained portions of the Pressurizer shell and skirt. The pressurizer shell has an inside diameter of 4.5 feet, and stands approximately 19 feet tall. Dismantlement and decontamination of the pressurizer began in 2022. A large man way was cut into the port side of the shell, through which access was gained to remove all internal components, and cut free the hemispherical bottom portion of the shell containing the heater wells. The interior surface of the shell was decontaminated using a Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 6 of30

SAVANNAHTechnical Staff Survey Unit Release Record 1

-

  • J rt combination of techniques, including laser ablation and mechanical grinding. Refer to Attachment I of this report for figures and maps depicting survey unit SYS-112.
3.

CLASSIFICATION BASIS Based on the NSS Historical Site Assessment [HSA], Reference (f), survey unit SYS-112, identified as survey unit 112D1, was identified as an impacted survey unit. No process events were documented in the HSA, however, in 1965, the Pressurizer heaters were replaced. Based upon a review of the historical information, the results ofall the post decon surveys and the completion of a final Survey Unit Classification Worksheet, the correct final classification of survey unit SYS-112 is an Impacted system.

4.

DAT A 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. The appropriate design for a given survey was developed using the DQO process as outlined in STS-05-030, Reference (c).

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 SYS-112 does 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, Reference (g) 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, Reference (h). 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 Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 7 of30

SAVANNAH Technical Staff Survey Unit Release Record total activity, it is accounted for as a surrogate to Co-60. Therefore, the final ROCs for final status surveys are Cs-13 7 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 ofROC for the decommissioning of the NSS, and the normalized mixture :fractions based on the radionuclide mixture.

Table 4 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 1.63E-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 2.11 E-05 Ag-108m 8.30E-04 l.38E-04 Cs-137 4.57E-01 7.61 E-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 I.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 LTP.

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.

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SAVANNAH Technical Staff Survey Unit Release Record The surrogate DCGL is computed as:

1 - --- +

rt DCGLsurrogate = DCGLETD X DCGLHTD (f HTD:ETDXDCGLETD )+DCGLHTD Equation 1 Where:

DCGLETD DCGLHTo FHTD:ETD the DCGL for the easy-to-detect radionuclide the DCGL for the hard-to-detect radionuclide 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 (

)

- 2.36E+04 dpm/100 cm 55.3 X 2.37E+04 +2.53E+08 In December 2022, twelve smears from the inner wall of the Pressurizer and five (5) smears from the Pressurizer bowl were sent to General Engineering Laboratory and composited into two (2) samples. One (1) composite sample was prepared for the bowl smears and one (1) composite sample was prepared for the inner wall smears. Both composite samples were analyzed by gamma spectrometry. The lab results showed only Co-60 was detected in the bowl smears composite. The wall smears composite showed both Co-60 and Cs-137 with positive activity. The Cs-137 activity is considered statistically positive at the 95%

confidence level (activity was greater than or equal to the 2-sigma uncertainty) but was less than the Minimum Detectable Activity. The Co-60 activity of the wall smears composite is 21 times greater than the Cs-137 activity.

This fingerprint, dominated by Co-60 is the only unique fingerprint on the NSS. Therefore, the gross activity DCGLw for SYS-112 is the DCGLco-60 surrogate equal to 2.36E+04 dpm/100 cm2.

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 DCGLw for SYS-112 is equal to 1.77E+04 dpm/100 cm2.

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 were required to ensure the quality and prevent the loss of data. STS-05-030, Reference (c) 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 MDCs 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.

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SAVANNAH Technical Staff Survey Unit Release Record

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-005-03 I, Calculation of the Number of Measurements for Final Status Surveys, Reference (i). The relative shift 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 (er), which is the standard deviation of the data set used for survey design. The optimal value for the relative shift should range between one (I) and three (3). If the relative shift is less than one (I), or greater than three (3), then the value of two (2) will be used for the relative shift.

Initially, the Pressurizer was to be removed intact as a heavy lift. Retaining the Neutron Shield Tank and Fuel Transfer Tank outer wall created clearance problems within the Containment Vessel, such that intact removal of the Pressurizer was no longer considered practical. Instead, a large access was cut into one side of it, so that its internals could be removed. Much time and effort were spent decontaminating the Pressurizer. The interior surfaces of the Pressurizer shell were decontaminated using a combination of methods including laser ablation and grinding. On September I I, 2023 and September 13, 2023, twenty-five (25) static measurements were collected on the interior surfaces of the Pressurizer to help make the decision that the Pressurizer was ready for FSS. This data was used to calculate the relative shift. The average total surface activity concentration and standard deviation of the measurements was 5,828 and 3,471.8 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 SYS-112 is based upon the survey results and was calculated as follows:

17,700-8,850 Relative Shift (~/er)=----- = 2.55 3,471.8 Both the Type I error, or a value, and the Type II error, or p value, were set at 0.05. The sample size from STS-05-031, Reference (i) that equates to the Type I and Type II error of 0.05 for use with the Sign Test is a minimum number of fixed measurements value of fifteen (15). Because of the significant effort to reduce the contamination levels inside the Pressurizer, two (2) additional samples will be collected. A total of 17 samples were used in the survey design for survey unit SYS-112.

The survey unit was designated Impacted; 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 Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 10 of30

SAVANNAH Technical Staff Survey Unit Release Record 1 - - -4 irl 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 SYS-112.

Table 5 SYS-112 Systematic Measurement Designations Label LX(m) LY(m)

Sample Area SYS-112-01 1.24 0.14 Pressurizer Interior Opposite Man-Way Cut SYS-112-02 0.21 1.93 Pressurizer Interior Opposite Man-Way Cut SYS-112-03 1.23 0.54 Pressurizer Interior Facing Man-Way Cut SYS-112-04 0.20 2.33 Pressurizer Interior Facing Man-Way Cut SYS-112-05 0.33

-0.61 Pressurizer Exterior Opposite Man-Way Cut SYS-112-06

-0.70 1.18 Pressurizer Exterior Opposite Man-Way Cut SYS-112-07 1.37 1.18 Pressurizer Exterior Opposite Man-Way Cut SYS-112-08 0.33 2.97 Pressurizer Exterior Opposite Man-Way Cut SYS-112-09

-0.46

-0.08 Pressurizer Exterior Facing Man-Way Cut SYS-112-10 1.61

-0.08 Pressurizer Exterior Facing Man-Way Cut SYS-112-1 l 0.58 1.71 Pressurizer Exterior Facing Man-Way Cut SYS-112-12 0.14 0.98 Skirt Interior Starboard Side SYS-112-13

1. I 3 1.01 Skirt Interior Port Side SYS-112-14

-0.06 0.41 Skirt Exterior Starboard Side SYS-112-15 0.98 2.20 Skirt Exterior Starboard Side SYS-I 12-16

-0.18 1.35 Skirt Exterior Port Side SYS-112-17 1.89 1.35 Skirt Exterior Port Side 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 SYS-112-13 was chosen for the replicate measurement. ln 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 (2) judgmental measurements to augment the systematic measurements. The locations of these two measurements were to be determined by the technicians or the field supervisor. Those two judgmental measurements are identified as SYS-112-18-J and SYS-112-19-J. Those locations are documented on the field forms.

For this Impacted system survey unit, the "Scanning Coverage" are those levels specified in L TP Chapter 5, Table 5-3, and are reproduced below in Table 5-2.

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SAVANNAH Technical Staff Survey Unit Release Record Table 5 Scanning Coverage Classification Required Scanning Coverage Fraction Systems and Components Judgmental For survey unit SYS-112, four (4) scan areas were established, SA-01 through SA-04. The survey package stated to scan I 00% of the accessible area in each scan area. Refer to for figures and maps depicting the measurement and scan locations in survey unit SYS-I 12.

For this Impacted systems 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 Systems and

> Operational DCGLw

> Operational DCGLw Components 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 1,500 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 SYS-112, compliance with the unrestricted use 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 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, Reference G). No conditions prohibited the proper collection of static and scan measurements.

FSS field activities were conducted under the approved FSS Package Number NSS-FSSP-SYS-1 12-00-00, which included DQOs, survey design, detailed FSS instructions, survey maps and survey forms. FSS field activities were projected to take two (2) 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 FFS package "Field Log" was used to document field activities and other information pertaining to the performance of the FSS.

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SAVANNAH Technical Staff Survey Unit Release Record

) --- d i rt The FSS field activities took three (3) days to complete and were performed between September 23, 2024, and September 25, 2024. During the data assessment review, the duplicate measurement was collected but by a different technician with the same instrument. Using a different instrument, the duplicate measurement was re-collected on December I 0, 2024. When placing the two (2) judgmental measurement locations on the survey map in February 2025, the coordinates for location SYS-112-19-J were not on the Pressurizer. On March 4, 2025, a new measurement for SYS-112-19-J was collected along with coordinates.

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 seventeen (17) systematic static measurement locations were marked based on the dimensions provided on the survey map. Two (2) judgmental measurement locations were selected and marked as per the sample plan. A I-minute static measurement was acquired at each location with the detector in contact with the surface.

All four (4) planned scan areas, SA-01 through SA-04, were scanned, resulting in 100% of the total surface area being scanned. The total scan area exceeds the scan coverage requirements for Systems and Components 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 (I) replicate static measurement. The random location of the replicate measurement was SYS-112-13 and identified as SYS-112-13-D. That measurement was collected with a different instrument but the same make and model used for the original measurement.

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

7.

SURVEY RESULTS The efficiencies used to convert count rates to activity are weighted efficiencies in which the Tc-99 (Co-60 surrogate) and Cs-137 efficiencies are weighted by the fraction Co-60 and Cs-137 comprise the NSS fingerprint. This is documented in CR-164, Reference (k).

For example, (derived from NUREG-1507) if the 4n contact Tc-99 efficiency is 0.1002 c/d and the 4n Cs-137 contact efficiency is 0.1868 c/d, the weighted contact efficiency is shown below.

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

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SAVANNAH Technical Staff Survey Unit Release Record

) -- --. } 7 The highest ambient background count rate from a 1-minute count was 69 cpm and was rounded up to 75 cpm. The unpainted surface contact detector weighted efficiency is equal to 0.1747 c/d. Using LTP Equation 5-6 (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 247.8 dpm/100 cm2

  • This value is equal to 1.4% of the operational DCGLw and 1. I% of the gross activity DCGLw. Table 7-1 presents the activity concentration for all final static measurements.

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

SYS-112-01 412.05 SYS-112-02 1447.91 SYS-112-03 1762.67 SYS-112-04 326.21 SYS-112-05 383.44 SYS-112-06 337.65 SYS-112-07 366.27 SYS-112-08 686.75 SYS-I 12-09 366.27 SYS-112-10 371.99 SYS-112-11 268.98 SYS-112-12 257.53 SYS-112-13 274.7 SYS-112-14 555.13 SYS-112-15 263.26 SYS-112-16 251.81 SYS-112-17 337.65 SYS-112-18-J 1030.13 SYS-112-19-J 2919.76 SYS-112-13-O 546.61 The raw static data with detector efficiencies are presented in Attachment 3.

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

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SAVANNAH Technical Staff Survey Unit Release Record Table 7 Basic Statistical Properties of Static Measurement Population Parameter Value Units Minimum Measurement 251.81 dpm/100 cm2 Maximum Measurement 2919.76 dpm/100 cm2 Mean 664.22 dpm/100 cm2 Median 366.27 dpm/100 cm2 Standard Deviation 690.88 dpm/100 cm2 Coefficient of Variation 1.04 unitless Residual activity dose rate 0.42 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 SYS-112, the calculated dose from residual activity is 0.42 mrem/yr.

The scan MDC for the Ludlum 43-93 detector was calculated using the same rounded up count rate of75 cpm, a distance of0.75 inches, and the unpainted surface detector weighted efficiency of 0. 1244 c/d. The detector width is 3.6 inches, and thus the detector speed is 3.6 in/second. With these parameters, the resulting observation interval is 1.234 seconds.

Using L TP Equation 5-8 (derived from NUREG-1507), the resulting MDC for scanning unpainted surfaces is 948.01 dpm/100 cm 2. This value is 5.4% of the operational DCGLw and 4.0% of 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-01 321.63 - 16885.59 8603.61 SA-02 225.14-13106.43 6665.79 SA-03 385.96 - 6432.61 3409.29 SA-04 233.18-3216.30 1724.74 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 (I) replicate static measurement (SYS-112-13-D) for analysis. The acceptance criteria for replicate static measurements is defined by NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual (MARLAP) Volume 1, Appendix C, Section C.4.2.2 Duplicate Analyses, Reference (I). 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 required method uncertainty (µMR) is a control limit formula value that is equal to the shift divided by ten (I 0). The shift is equal to the Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 15 of30

SAVANNAH Technical Staff Survey Unit Release Record operational DCGLw, minus one half the operational DCGLw, or 8,850 dpm/100 cm2.

Therefore, the control limit is equal to 3,752.4 dpm/100 cm2, as shown below.

Control limit= 8,850/10*4.24 = 3,752.4 dpm/100 cm2.

The results of the evaluation of the QC measurement show agreement between the original and duplicate measurements. See Attachment 4 for the results.

9.

INVESTIGATIONS AND RESULTS Two (2) locations triggered the scan action level of 1,500 cpm, requiring a confirmatory static measurement at each location. The results of the static measurements are SA-01-01 equal to 12,018.18 dpm/100 cm2, and SA-01-02 equal to 8,527.19 dpm/100 cm2. Neither measurement triggered the Investigation Level of 17,700 dpm/100 cm2.

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 or field changes to the FSS package which was developed in accordance with STS-005-030.

12.

DATA QUALITY ASSESSMENT The DQO sample design and data were reviewed in accordance with MARAD procedure STS-005-033, Final Status Survey Data Assessment and Investigation, Reference (m) 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 an Impacted system.

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.

All seventeen systematic/unbiased measurements did not require remediation and were less than the DCGLw. Although MARSSJM states that the Sign Test need not be performed in the instance that no measurements exceed the DCGLw, 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 use criteria, thus, the null hypothesis is rejected. The results of the Sign Test are presented in Attachment 5.

Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 16 of30

SAVANNAH Technical Staff Survey Unit Release Record

13.

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

14.

CONCLUSIONS

15.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

G)

(k)

(I)

(m)

Survey unit SYS-112 has met the DQOs of the FSS package. The survey unit is properly classified as Impacted.

All final measurements are less than the DCGLw. 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 SYS-112 is 0.42 mrem/yr TEDE, based on the mean activity of all the final measurements.

Survey unit SYS-112 is acceptable for unrestricted use.

REFERENCES STS-005-035, Preparation of Survey Unit Release Records and FSS Final Reports.

STS-004-003, N.S. SAVANNAH License Termination Plan, Revision 1.

STS-005-030, Preparation of Final Status Survey Packages.

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

STS-004-002, Updated Final Safety Analysis Report, Revision 13, July 20, 2023.

CR-003, STS-109, Historical Site Assessment, Revision 1, 2023..

CR-139, TSD 21-089, Calculations to Support NSS Surface Contamination DCGLs, Revision I, September 2022.

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

STS-005-031, Calculation of the Number of Measurements for Final Status Surveys.

STS-005-032, Survey Unit Turnover and Control.

CR-164, TSD 23-126, Calculation of Weighted Efficiencies and MDCs of Ludlum Detectors for Final Status Surveys on the NS SAVANNAH, Rev 01.

NUREG-1576, Multi-Agency Radiological Laboratory Analytical Protocols Manual, (MARLAP), July 2004.

STS-005-033, Final Status Survey Data Assessment and Investigation.

Survey Unit SYS-112 Page 17 of30 Primary Pressurizing System (PE) including retained portions of the Pressurizer

SAVANNAH Technical Staff Survey Unit Release Record

16.

ATTACHMENTS Attachment I - Figures and Maps - Calibration Records - Static and Scan Data - Quality Control Assessment - Sign Test - Graphical Presentations Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 18 of30

SAVANNAH Technical Staff Survey Unit Release Record Survey Unit SYS-11 2 Primary Pressurizing System (PE) including retained portions of the Pressurizer - Figures and Maps Location of the Pressurizer f Pressurizer BOW 2 ---- ;

j I

I I j Page 19 of30

SAVANNAHTechnical Staff Survey Unit Release Record

~

0 CD Primary Pressurizing System (PE) including retained portions of the Pressurizer Systematic and Judgmental Static Locations

(

  • Pressurizer Interior Opposite Man-Way cut

-$7YS* 112-02 SYS-112-06

  • SYS-112-05 LEGEND:

... --~

X _,,

Origin Point Location Pressurizer Exterior Facing Man-Way Cut Pressurizer Interior Facing Man-Way Cut Skirt Exterior FWD Side Skirt Interior FWD Side Pressurizer Interior Facing Man-Way cut

n.

SYS-112-0l-19-J

'#YS-112-04 0

Skirt tnterior An Side Skirt lntenor Forward Side n

-$-s S-112-03

~112 18-J

____ _,/

\\

Skirt Open ng-\\,.

Pressurtzer Exterior Facing Man-Way Cut Skirt Exterior An Side

  1. "S-112-1 Skirt Exterior Forward Side svs-*12-16 NOTES.

SA'APLE LOCATIONS CREATED IN VISUAL SAMPLE Pl.AN NUMBER OF SAMPLE.S 17 PlACE*.1ENT METHOD: SYSTEMATIC START LOC: RANDOM Distance above Frame Baseline Distance from Centerline 9" Forward of 26' 8" ABL

.2' 7" To the Port Side of CL Frame 106 9" Forward of 26' 8" ABL 2' 3" To the Port Side of CL Frame 106 9" Forward of 17' 5" ABL 2' 6" To the Starboard Side of Frame 106 Centerline 9" Forward of 17' 5" ABL 2' 4" To the Starboard Side of Frame 106 Centerline Ys-112*17 Survey Unit SYS-112 Page 20 of30 Primary Pressurizing System (PE) including retained portions of the Pressurizer

SAVANNAH Technical Staff Survey Unit Release Record Primary Pressurizing System (PE) including retained portions of the Pressurizer Pressurizer Interior SA-01 0

0 SA--01 Pressunzer Exterior SA-03 SA-03 Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Scan Areas LEGEND.

Skirt Interior SA-02 SA-02 Skirt Exterior SA--04 SA-04 Page 21 of30

SAVANNAH Technical Staff Survey Unit Release Record d - Calibration Records C3llbr:illon cenlflc:ite - ID Number: 25035112000 - 20240606 - o RSCS Customer: Scott Ginter RaaIatIon Safety & control services, Inc.

93 ledge Road Seabrook NH 03874 lnstrumtnt Luelum Moelel 3002 Probe Mod*I Ludlum 43-93 Serl.ii Number 25035112 Serl.ii Number 421417 Precision Check Test1 I

Test2 I

Test3 I

Mean I

Results M0kcpm I

4.99 kcpm I

4.99 kcpm I

4,99 kcpm I

Pass Accuracy Check Range Taroet Value As Founa As Len source ID AUTO 500 Kcpm#

500Kcpm#

500Kcpm#

Pulser 98756 AUTO 50 Kcpm#

50 Kcpm#

50 Kcpm#

Pulser 987 56 AUTO 5 Kcpm#

5Kcpm#

5 Kcpm#

PUiser 98756 AUTO 0.5 Kcpm #

0.499Kcpm#

0.499 Kcpm#

Pulser 98756 Readings \\\\1th

  • Ind cate ranges wnere As-Found readings are >20% of Target value.

Readings v.1th ** I00IcateAs-Ien rea<1Ings are >10% Of Target value Readings with # Indicate ranges were calibrated using a pulser Probe Isotope 43-93 4214 17 Cs-I 37(Beta) 43-93421417 Tc-99 43-93 421417 Tc-99 43-93 421417 Cs-137(Beta) 43-93 421417 Cs-137(Beta) 43-93 421417 Tc-99 43-93 42 1417 Tc-99 43-93 4214 17 Cs-137(Beta)

Physical Checks Light Check of Scmtilation Probes Pass Outer Physical Check Pass Tap Test Pass Audio Function Cheek Pass Cord cheek Pass Calibration Date Set: Pass Efficiency NIST Sour~ ID

0. 1901 CID (4 Pl) 127357 Cs-137(Beta) 0 1028 CID (4 Pi) 127356 Tc-99 0.0699 CID (4 Pi) 127356 Tc-99 0 1360 CID (4 Pl) 127357 Cs-137(Beta) 0.0167 CID (4 Pi) 127357 Cs-137(Beta) 0.0076 CID (4 Pi) 127356 Tc-99 0 0056 CID (4 Pi) 127356 Tc-99 0.0152 CID (4 Pi) 127357 Cs-137(Beta)

Electronics Checks Hi h Volta e Comments. Efficiencies done using 1.5" thick fiberglass grate as requested Customer Equ*pment ID:

Calibrated By Nicole WedI9 QC Review By Matthew Hunter Atmospheric Cond,1,ons - Te'llperature. 71 0 ' F Humklrty-52.0 %, Barometnc Pressure:29.62 lll/hg G*ometry comment Flat surface On Contact Flat surface On Contact Flat surface 314* Aoove Source Flat surface 3/4" Aoove 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 704 Volts 704 Volts Date: Jun 06, 2024 Expires: Jun 06, 2025 QC Date Jun 06. 2024 In toferance conditions are based on test results fa ling Nitl, n specified hm s with no reduction by ltle uncertainty of th-measurement The results cont:.1ined herein rel:1te only to e,tern ~[brated Unless Olllerw se st:lted this cal,brotlon was pertonned by RSCS at 93 Ledo,; Rd. Se:iblook NH u: IZ,ng the roI1ow,ng NIST Traceable sources Pulser 96756 * (Cal Due: Oct 31 2024)

Wol1(ed on calitmltion. N1cote Wedio The reported expanded uncertainry or measurement,s sra:ed *s the s:andJrd uncenamtv of measurement irultiplied by the ooverage factor k sucn at the coverage prOIJ:ibi rty corresponds to 3PPfOxlm31ely 95~.

Unless otherwise stated cal brat.ans perfoored in C011folmance to the lo 10-.,ing documents: ANSI N323AB-20t3, RSCS New H*mpshlre R3dioac e M:l:enal L!Cense r-.umber 381 R RSCS ca Ibrat1on sorv ces are pertom*ea In *cc:ordance with the RSCS Radla:ion Protection Program Manu*I and

'o>-.JtonSnfy& Conrol ~

nc.

~..... Ro,,c Sdnd:NH03e~,

1/1 rzt Survey Unit SYS-112 Page 22 of30 Primary Pressurizing System (PE) including retained portions of the Pressurizer

SAVANNAH Technical Staff Survey Unit Release Record Calibration Certfflcate

  • ID Number: 25017648000
  • 202407011 - 0 Customer: Scott Ginter Radiation Safety & Control Services, Inc.

93 Ledge Road Seabrook NH 03874 lostrument Lud~m Model 3002 Probe Model Ludlum 43-93 Precision Check Serial Number 25017648 Serlal Number 379676 Test1 I

Test2 I

Tesl3 I

Mean I

Results

!50.00 kcpm I

49.80 kcpm I

49.80kcpm I

49.871tcpm I

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

499Kcpm#

499 Kcpm#

AUTO 50 Kcpm#

50Kcpm#

50Kcpm#

AUTO 5 Kcpm#

4.99 Kcpm #

4.99Kcpm#

AUTO 0.5Kcpm#

0.505 Kcpm#

0.505 Kcpm#

Readings with

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

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

Readings with # Indicate ranges were calibrated using a pulser Probe lsotooe 43-93 379676 Cs-137(Beta) 43-93 379676 Tc-99 43-93 379676 Cs-137(Beta) 43-93 379676 Tc-99 43-93 379676 Cs-137(Beta) 43-93 379676 Tc-99 43-93 379676 Cs-137(Be1a) 43-93 379676 Tc-99 43--93 379676 Sr/Y-90 43-93 379676 Th-228 Physical Check*

Light Check of ScintilaUon Probes Pass Outer Physical Check: Pass Tap Test: Pass Audio Function Check: Pass Cord check. Pass Comments:

Customer Equipment ID:

Efficiency 0.1918 CID (4 Pi) 0.1103 CID (4 Pl) 0.1351 C/0(4 Pl) 0.0733 CID (4 Pl) 0.0196 CID (4 Pl) 0.0093 C/D (4 Pi) 0.0152 CID (4 Pi) 0.0063 CID (4 Pl) 0.2165 CID (4 Pl) 0.0962 CID (4 PII NIST Source ID Geometry 127357 Cs-137(Beta)

Flat Surface 127356 T o-99 Flat Surface 127357 Cs-137(Beta)

Flat Surface 127356 To-99 Flat Surface 127357 Cs-137(Beta)

Flat Surface 127356 Tc-99 Flat Surface 127357 Ca-137(Beta)

Flat Surface 127356 Tc-99 Flat Surface TS-173 Sr/Y-90 1 cm TS-691 Th-230 1 cm EIKtronlcs Checks As Found High Voltage 640 Volts Pan Source ID Pulser 98756 Pulser 98756 Pulsar 98756 Pulsor 98756 Comment On Source On Source 3/4' Above &ource 3/4" Above Source On Grate On Grete 314" Above Grate 314" Above Grate As Left 765 Vols Calibrated By Jarod Fagan QC Review By Matthew Hunter Date: Jui 09, 2024 Expires: Jul 09, 2025 QC Date: Jul 09, 2024 Atmospheric Conditions - Temperature; 71.1 "F, Humidity. 2.0 %, Barom<itric Pressure:29.96 ln,1,g.

In tolerance conditions are based on lest results falling wrthln specified limlta wi1h no reduction by the uncerllllnly of tho measurement The ruuf11 contained herein relate only lo 1he item calibrated.

Unleos otheiwlse 61ated, this cal1bratlon was performed by RSCS et 93 Ledge Rd, Seabrook. NH utiizing the following NIST T111ceable sourees:

Pulser 98756 - (Cel Due: Oct 31, 2024)

Woll<ed on calibration: Jarod Fagan The reponed e>Cpended uncertainty of measl.Qtn9/lt Is alaled u the 5tanderd uncertelnty of measurement mulbplied by the coverage feetor k such that tho coverage probab~lly corresponds lo approxinately 95%

Unleaa otherwise stated, calibrabons performed In conformance to the followlng documents: ANSI N323AB-2013; RSCS New Hampshire Radlo,ctlve 1/2 t

Survey Unit SYS-112 Page 23 of30 Primary Pressurizing System (PE) including retained portions of the Pressurizer

SAVANNAH Technical Staff Survey Unit Release Record Ca lb'lllio C rtifi

  • 10 Number; 25035147000
  • 202.40304. 1 RSCS Inc l"strument Lud ~m *,lodel. O PIO FIi t.lel l dlum 41-93 Prccls ori Ch ck ti.*e:.n su,i~I Num 2503!;147 Serial Numb r 42iA1 Tc~l3 4.ll1i kcpm

,._99 lleprn _______

~~

Accuracy Check f.UTO

/IUTO

~O Ct'l'III A TO AJTO

.3dIn9 with ' Ind Cill Read1n9a wit~ *

  • tc.JL R
J,ca*

uls r

.Pro

--'-' _______ E_ffi_1c_kl_n_t.11 _____

N_JS_l Source 10 43-93 421411 43-93 ~21411 4393 4214 11 43-93 421411 43-3 214 1 I 43-.3421411 4:l-!i'J "2'41 43-SJ.t21 41f Can1 Cs-13{( ~1aJ c-!l9 Ct- '¥1' la) c-99 Cu*t rn r [quip1r n D Ca 1 ated lly I\\Jto e Wcd,g O 0561 cm(~ Pl) 127 57 Cs-37(Bota) 0 0250 CID(~ Pi) 1 73.Y.i Tc-99

0. ~~8 Ci'D,

I) 27351 Cs-37(8 1 l 0.0 18 CID (4 Pl) 1:?73. - Te-99 0

CIP(4 P1) 0 1002 CID (4 P1) 0.1 7 CJD (4

)

0.0629 CID (4 P )

ac R vis" B:,, !ar.he*N H r,ter SL £~.. 1-*e 4 Gome F lee! $11'"',

fl lSu ace 111 Sur1ace 3.'4" Abo 314* Above Grat On Cont.lei llar 04, 2025 QC Oel

  • ,larCl, 2024 CtJYC al.:at1

]

'It.. s C,,-

  • lEC '70,~ W1 I..-,1

{lrrrr'islr~IJr.o lt'Cf *deal"""'"...,,r e el U!

1 Survey Unit SYS-I 12 Page 24 of30 Primary Pressurizing System (PE) including retained portions of the Pressurizer

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

(c/d) 25035112 SYS-112-01 72 0.1747 25035112 SYS-112-02 253 0.1747 25035112 SYS-112-03 308 0.1747 25035112 SYS-112-04 57 0.1747 25035112 SYS-112-05 67 0.1747 25035112 SYS-112-06 59 0.1747 25035112 SYS-112-07 64 0.1747 25035112 SYS-112-08 120 0.1747 25035112 SYS-112-09 64 0.1747 25035112 SYS-112-10 65 0.1747 25035112 SYS-112-11 47 0.1747 25035112 SYS-112-12 45 0.1747 25035112 SYS-112-13 48 0.1747 25035112 SYS-112-14 97 0.1747 25035112 SYS-112-15 46 0.1747 25035112 SYS-112-16 44 0.1747 25035112 SYS-112-17 59 0.1747 25035112 SYS-112-18-J 180 0.1747 25035147 SYS-112-19-J 530 0.1815 25017648 SYS-112-13-D 97 0.1775 25035112 SA-01-1 2100 0.1747 25035112 SA-02-1 1490 0.1747 Note: Meter IDs 25035112, 25035147 and 25017648 are connected to a Ludlum model 43-93 detector with an area of I 00 cm2.

Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 25 of30

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

(cpm)

SA-01 52/2100 l 076.0 SA-02 28/1630 829.0 SA-03 48/800 424.0 SA-04 29/400 214.5 SA-01 40/120 80.0 7, - -. -- -

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

Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 26 of30

SAVANNAH Technical Staff Survey Unit Release Record - Quality Control Assessment Measurement Initial measurement Replicate measurement Average Absolute Value of the difference Condition Absolute value of the (dpm/100 cm2) difference Average < 17,700 271.91 Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Value (dpm/100 cm2) 274.70 546.61 410.66 271.91 Control Limit (dpm/100 cm2) 3752.4 Result Pass Page 27 of30

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

SYS-112-01 412.05 SYS-112-02 1447.91 SYS-112-03 1762.67 SYS-112-04 326.21 SYS-112-05 383.44 SYS-112-06 337.65 SYS-112-07 366.27 SYS-112-08 686.75 SYS-112-09 366.27 SYS-112-10 371.99 SYS-112-11 268.98 SYS-112-12 257.53 SYS-112-13 274.70 SYS-112-14 555.13 SYS-112-15 263.26 SYS-112-16 251.81 SYS-112-17 337.65 SYS-112-18-J 1030.13 SYS-112-19-J 2919.76 Parameter Number of Measurements Number of S+

Critical Value Meets I Doesn't Meet Acceptance Criteria Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer DCGLw - Result (dpm/100 cm2) 23187.95 22152.09 21837.33 23273.79 23216.56 23262.35 23233.73 22913.25 23233.73 23228.01 23331.02 23342.47 23325.30 23044.87 23336.74 23348.19 23262.35 22569.87 20680.24 Result 19 19 13 Meets

, f - -. -- -- hst Sign

+l

+1

+l

+l

+l

+l

+l

+1

+l

+1

+l

+l

+l

+l

+l

+l

+l

+I

+l Page 28 of30

SAVANNAH Technical Staff Survey Unit Release Record - Graphical Presentations Quantile Plot of Gross Activity Concentration 3400 3 100 2800 N 5 2500 8 2200

---E 1900

a.

~ 1600

(.)

C 1300 0 u 0 1000

< 700 400

  • 100 0%

10%

20%

30%

40%

50~o 60%

70%

80%

90%

100%

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

Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer Page 29 of30

SAVANNAH Technical Staff Survey Unit Release Record

, - -. -- - bri Histogram Survey Unit Number: SYS-112 Primary Pressurizing System (PE) including Survey Unit Name: retained portions of the Pressurizer 16 14 12 10

(.)

C Q) 8 CT

!I)

G:

6

-1 2

0 585 919 1252 1586 1919 2253 Upper end\\ aluc (dpm/100 cm )

Survey Unit SYS-112 Primary Pressurizing System (PE) including retained portions of the Pressurizer 2586 -

2920 Page 30 of30

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