ML19295G857

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Revised Final Status Survey (FSS) Report - Phase 2, Release Record - Unit 1 Tendon Tunnel 547 Foot Embedded Floor Drain Pipe Survey Unit 06211
ML19295G857
Person / Time
Site: Zion  File:ZionSolutions icon.png
Issue date: 09/01/2019
From: Graham J
ZionSolutions
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML19295G627 List:
References
ZS-2019-0090
Download: ML19295G857 (34)
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Text

ZION STATION RESTORATION PROJECT FINAL STATUS SURVEY RELEASE RECORD UNIT 1 TENDON TUNNEL 547 FOOT EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211

FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 PREPARED BY / DATE: J. Graham 2019-09-01 Radiological Engineer REVIEWED BY / DATE: P. Giza 2019-09-01 Radiological Engineer APPROVED BY / DATE: D. Wojtkowiak 2019-09-01 C/LT Manager

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 TABLE OF CONTENTS

1. EXECUTIVE

SUMMARY

....................................................................................................5

2. SURVEY UNIT DESCRIPTION ..........................................................................................5
3. CLASSIFICATION BASIS ...................................................................................................5
4. DATA QUALITY OBJECTIVES (DQO) ............................................................................6
5. SURVEY DESIGN .................................................................................................................9
6. SURVEY IMPLEMENTATION ........................................................................................13
7. SURVEY RESULTS ............................................................................................................15
8. QUALITY CONTROL ........................................................................................................17
9. INVESTIGATIONS AND RESULTS ................................................................................17
10. REMEDIATION AND RESULTS......................................................................................17
11. CHANGES FROM THE SURVEY PLAN ........................................................................17
12. DATA QUALITY ASSESSMENT .....................................................................................17
13. ANOMALIES .......................................................................................................................18
14. CONCLUSION .....................................................................................................................18
15. REFERENCES .....................................................................................................................18
16. ATTACHMENTS .................................................................................................................19 ATTACHMENT 1 - TENDON TUNNEL EMBEDDED DRAIN LAYOUT ......................................20 ATTACHMENT 2 - MEASUREMENT DATA ...........................................................................22 ATTACHMENT 3 - SIGN TEST ..............................................................................................26 ATTACHMENT 4 - QC DATA ...............................................................................................29 ATTACHMENT 5 - GRAPHICAL PRESENTATIONS .................................................................31 LIST OF TABLES Table 1 - Dose Significant Radionuclides and Mixture................................................................... 7 Table 2 - Base Case and Operational DCGLs ................................................................................. 8 Table 3 - Surrogate Ratios ............................................................................................................... 9 Table 4 - Surrogate Base Case and Operational DCGLs ............................................................... 10 Table 5 - Typical FSS Instrument Detection Sensitivities............................................................. 12 Table 6 - Synopsis of Survey Design ............................................................................................ 13 Table 7 - Survey Data Collected .................................................................................................... 14 Table 8 - Instrument and detector .................................................................................................. 15 Table 9 - Unit 1 Tendon Tunnel Embedded Floor Drain Pipe - Statistical Quantities .................. 16

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 LIST OF ACRONYMS AND ABBREVIATIONS ALARA As Low As Reasonably Achievable AMCG Average Member of the Critical Group BcDCGL Base Case Derived Concentration Guideline Level BcSOF Base Case Sum of Fractions DQA Data Quality Assessment DQO Data Quality Objective DCGL Derived Concentration Guideline Level FOV Field of View FSS Final Status Survey HTD Hard-to-Detect IC Insignificant Contributor ID Internal Diameter LTP License Termination Plan MARSSIM Multi-Agency Radiation Survey and Site Investigation Manual MDC Minimum Detectable Concentration OpDCGL Operational Derived Concentration Guideline Level OpSOF Operational Sum of Fractions QAPP Quality Assurance Project Plan QC Quality Control ROC Radionuclides of Concern SOF Sum of Fractions TEDE Total Effective Dose Equivalent UCL Upper Confidence Level ZNPS Zion Nuclear Power Station ZSRP Zion Station Restoration Project

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211

1. EXECUTIVE

SUMMARY

This Final Status Survey (FSS) Release Record for survey unit 06211, Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe, has been generated for the Zion Station Restoration Project (ZSRP). The release record was developed in accordance with ZionSolutions procedure ZS-LT-300-001-005, Final Status Survey Data Reporting (Reference 1) and satisfies the requirements of Section 5.11 of the Zion Station Restoration Project License Termination Plan (LTP) (Reference 2).

FSS Sample Plan S3-06211AF was developed in accordance with ZionSolutions procedure ZS-LT-300-001-001, Final Status Survey Package Development (Reference 3) the ZSRP LTP, and guidance from NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) (Reference 4).

Final Status Survey was conducted to demonstrate that the concentrations of residual radioactivity are equal to or below site-specific Derived Concentration Guideline Levels (DCGL) corresponding to the dose criterion in 10 CFR 20.1402. The Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe was classified as MARSSIM Class 3.

The Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe was surveyed with a Ludlum 2350-1 Data Logger paired with a 44-159 gamma detector. The survey plan required measurements to be collected at 10-foot intervals to provide for 10% survey coverage for the Class 3 survey unit. The length of this piping system was 524.21 linear feet.

For the FSS of the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe, 58 readings were obtained. All of the readings were below a Sum of Fractions (SOF) of 0.5 when compared against the Operational DCGL for embedded pipe (OpDCGLEP), with a mean Operational SOF (OpSOF) reading of 0.018. The mean Base Case SOF (BcSOF),

when compared against the Base Case DCGL for embedded pipe (BcDCGLEP) was 0.000, which results in the dose calculated for this survey unit of 0.009 mrem/yr.

2. SURVEY UNIT DESCRIPTION The Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe consists of a 4-inch Internal Diameter (ID) pipe that is 524.21 feet in length. The floor of the tunnel is at the 548 foot elevation, with the drain piping embedded in the concrete approximately 7-inches deep.
3. CLASSIFICATION BASIS Survey unit 06211 was classified in accordance with ZionSolutions procedure ZS-LT-300-001-002, Survey Unit Classification (Reference 5).

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 The Tendon Tunnels were part of the Turbine Building basement FSS unit. The Turbine Building was initially classified as a Class 2 structure by the Zion Station Historical Site Assessment (HSA) (Reference 6). LTP Section 5.5.2.1.2 changed the classification of the Turbine Building basement from Class 2 to Class 3. The LTP states The FSS units for the basements of the Turbine Building, the Crib House/Forebay, WWTF and the Circulating Water Discharge Tunnels are designated as Class 3 as defined in MARSSIM, section 2.2 in that the FSS units are expected to contain levels of residual activity at a small fraction of the DCGLs, based on site operating history and previous radiation surveys.

Although the Unit 1 Tendon Tunnels were inaccessible during site characterization in 2013, the results of environmental monitoring of radiological effluents indicated that the residual radioactivity present in this FSS unit was minimal, supporting the Class 3 classification.

4. DATA QUALITY OBJECTIVES (DQO)

Final Status Survey planning and design hinges on coherence with the 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 ZSRP LTP in accordance with MARSSIM. The appropriate design for a given survey will be developed using the DQO process as outlined in Appendix D of MARSSIM.

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 plan, 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 was to demonstrate that the level of residual radioactivity in survey unit 06211 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity was As Low As Reasonably Achievable (ALARA).

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 LTP Chapter 6, section 6.5.2 discusses the process used to derive the Radionuclides of Concern (ROC) for the decommissioning of Zion Nuclear Power Station (ZNPS),

including the elimination of insignificant dose contributors (IC) from the initial suite.

Based upon the analysis of the mixture, it was determined that Co-60, Ni-63, Sr-90, Cs-134 and Cs-137 accounted for 99.5% of all dose in the non-activated contaminated concrete mixes.

The residual radioactivity in embedded piping located below the 588 foot grade that will remain and be subjected to FSS is discussed in LTP Chapter 2, section 2.3.3.7 and TSD 14-016, Description of Embedded Piping, Penetrations, and Buried Pipe to Remain in Zion End State (Reference 7). The DCGLs for embedded piping are presented in LTP Chapter 5, sections 5.2.7 and 5.2.8.

The survey design for this FSS was developed using the isotopic mixture for the Containment. During Data Assessment, it was determined that the isotopic mix incorporated into the survey design was incorrect. The correct mixture to use for this piping system is the Auxiliary Building isotopic mixture. The Auxiliary Building isotopic mixture was deemed appropriate because the Tendon Tunnel drains are hydraulically connected to the Turbine Building Steam Tunnel drains, and have no connection to systems in Containment. The data analysis performed for this Release Record was performed using the Auxiliary Building isotopic mix.

Table 1 presents the ROC for the Auxiliary Building basement and the normalized fractions based on the radionuclide mixture.

Table 1 - Dose Significant Radionuclides and Mixture Auxiliary Building Radionuclide  % of Total Activity (normalized)(1)

Co-60 0.92%

Ni-63 23.71%

Sr-90 0.05%

Cs-134 0.01%

Cs-137 75.32%

(1) Based on maximum percent of total activity from Table 20 of TSD 14-019, normalized to one for the dose significant radionuclides.

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 A FSS was conducted on the interior surfaces of embedded piping to demonstrate that the concentrations of residual activity were equal to or below DCGLs corresponding to the dose criterion in 10CFR20.1402 (DCGLEP). DCGLEP were calculated for each of the remaining embedded pipe systems.

At ZNPS, compliance is demonstrated through the summation of dose from four distinct source terms for the end-state (basements, soils, buried pipe and groundwater). Each radionuclide-specific BcDCGL 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 25 mrem/yr to an Average Member of the Critical Group (AMCG). To ensure that the summation of dose from each source term is 25 mrem/yr or less after all FSS is completed, the BcDCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/yr dose limit from each source term. The reduced DCGLs, or Operational DCGLs can be related to the BcDCGLs as an expected fraction of dose based on an a priori assessment of what the expected dose should be based on the results of site characterization, process knowledge and the extent of planned remediation.

The OpDCGL is then used as the DCGL for the FSS design of the survey unit (calculation of surrogate DCGLs, investigations levels, etc.). Details of the OpDCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in ZionSolutions TSD 17-004, Operational Derived Concentration Guideline Levels for Final Status Survey (Reference 8).

The Base Case and Operational DCGLs for the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe are listed in Tables 5-11 and 5-12 of the LTP, and are reproduced in the Table 2. The IC dose percentage of 5% was used to adjust the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe DCGLs to account for the dose from the eliminated IC radionuclides.

Table 2 - Base Case and Operational DCGLs Base Case DCGLs for Operational DCGLs for Tendon Tunnel Tendon Tunnel Radionuclide Embedded Pipe Embedded Pipe (pCi/m2) (pCi/m2)

Co-60 1.06E+10 2.12E+08 Cs-134 2.04E+09 4.08E+07 Cs-137 2.67E+09 5.34E+07 Ni-63 2.72E+11 5.44E+09 Sr-90 9.70E+07 1.94E+06

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 Instrument DQOs included a verification of the ability of the survey instrument to detect the radiation(s) of interest relative to the OpDCGL. The Ludlum 44-159 gamma detector was selected as the primary instrument used to perform FSS of the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe. Response checks were required prior to issuance and after use. Control and accountability of instrumentation used to acquire FSS data was required to assure data quality.

5. SURVEY DESIGN The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedure ZS-LT-300-001-001 Final Status Survey Package Development.

The survey design for this FSS listed the radionuclides for the Containment mixture as the ROC for survey unit 06211. This was corrected during data analysis to the isotopic mixture for the Auxiliary Building. Co-60, Ni-63, Sr-90, Cs-134 and Cs-137 are the ROC in survey unit 06211.

During FSS, concentrations for Hard-to-Detect (HTD) ROC Ni-63 and Sr-90 were inferred using a surrogate approach. Cs-137 is the principle surrogate radionuclide for Sr-90 and Co-60 is the principle surrogate radionuclide for Ni-63. The mean, maximum and 95% Upper Confidence Level (UCL) of the surrogate ratios for concrete core samples taken in the Auxiliary Building basement were calculated in ZionSolutions TSD 14-019, Radionuclides of Concern for Soil and Basement Fill Model Source Terms (Reference 9) and are presented in Table 3, which is reproduced from LTP Chapter 5, Table 5-12. The maximum ratios were used in the surrogate calculations during FSS.

The results of the surrogate calculations are listed in Table 4.

Table 3 - Surrogate Ratios Auxiliary Building Ratios Mean Max 95%UCL Ni-63/Co-60 44.143 180.450 154.632 Sr-90/Cs-137 0.001 0.002 0.002 The equation for calculating a surrogate DCGL is as follows:

Equation 1 1

=

1 2 3

+ + +

2 3 Using the Base Case and Operational DCGLs presented in Table 2 and the maximum ratios from Table 3, the following surrogate calculations were performed:

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 Equation 2 1

(137) = = 2.5309 /2 1 0.002

+

2.6709(137) 9.7007(90)

Equation 3 1

(137) = = 5.0607 /2 1 0.002

+

5.3407(137) 1.9406(90)

Equation 4 1

(60) = = 1.3209 /2 1 180.45

+

1.0610(060) 2.7211(63)

Equation 5 1

(60) = = 2.6407 /2 1 180.45

+

2.128(060) 5.449(63)

Table 4 - Surrogate Base Case and Operational DCGLs Base Case Operational Radionuclide Embedded Pipe DCGL Embedded Pipe DCGL 2

pCi/m pCi/m2 Co-60 1.32E+09 2.64E+07 Cs-134 2.04E+09 4.08E+07 Cs-137 2.53E+09 5.06E+07 Using the normalized gamma mixture for the Containment from LTP Chapter 5, Table 5-2 and, the surrogate OpDCGLs for Co-60 and Cs-137 plus from Table 4 plus the Operational DCGLs for Cs-134, Eu-152 and Eu-154 from LTP Chapter 5, Table 5-12, a gross-gamma OpDCGL of 4.81E+07 pCi/m2 was derived. The Action Level used for the FSS of this survey unit was 50% of that value which equates to 2.40E+07 pCi/m2. The actual gross gamma Operational DCGL using the Auxiliary Building mixture is 5.01E+07 pCi/m2 and 50% of that value equates to 2.50E+07 pCi/m2, which is less conservative than the Action Level that was actually used.

The Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe is a Class 3 embedded pipe. For the survey of pipe internal surfaces, areal coverage is achieved by the area of detection for each static measurement taken. Scanning, in the traditional context is not applicable to the survey of pipe internal surfaces. For the survey of these pipes, the pipe detector was calibrated for the specific geometry of the 4-inch diameter pipes. For a

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 4-inch diameter pipe, each measurement has a calculated Field of View (FOV) of 1.05 ft2 (0.097 m2).

The Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe consists of 524.21 linear feet of 4-inch diameter pipe, which equated to a surface area of 51 m2. Procedure ZS-LT-300-001-001, Final Status Survey Package Development states that for the FSS of a Class 3 survey unit, an areal scan coverage of at least 10% is required. The survey design stated that one measurement was to be collected every 10 linear feet of piping traversed for a total of 52 distinct measurements over the entire accessible pathway of the piping system. In addition, for quality control purposes, a minimum of 5% of the measurements collected were to be replicated. This required 3 replicated measurements to be collected throughout the length of the accessible surface of the piping system at locations selected at random.

Each static measurement represents the gamma activity in gross cpm for each specific measurement location. This gamma measurement value in cpm was then converted to dpm using an efficiency factor based on the calibration source. The total activity in dpm was adjusted for the assumed total effective surface area commensurate with the pipe diameter, resulting in measurement results in units of dpm per m2. Unit conversion was then used to convert dpm to units of pCi. This measurement result, in units of pCi/m2, then represented a commensurate and conservative gamma surface activity The total gamma surface activity for each FSS measurement was then converted to a gamma measurement result (in units of pCi/m2) for each gamma ROC based on the normalized gamma mixture from Table 1. Concentrations for HTD ROC were inferred using a surrogate approach as per LTP Chapter 5. Cs-137 is the principle surrogate radionuclide for H-3 and Sr-90. Co-60 is the principle surrogate radionuclide for Ni-63. The maximum ratios from Table 3 were used in the surrogate calculations.

The unity rule is applied when there is more than one ROC. The measurement results for each singular ROC present in the mixture were compared against their respective OpDCGL to derive a dose fraction. The summation of the dose fractions for each ROC produces a OpSOF for the measurement.

To demonstrate that the survey unit satisfies the OpDCGL, the ROC concentration for each systematic measurement taken in the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe was divided by its applicable OpDCGLEP to derive a OpSOF for the ROC. The OpSOF for each ROC was then summed to determine the total OpSOF for all ROC that represents the measurement and was used as the summed value (Ws) for performing the Sign Test.

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 If the OpSOF for a systematic or judgmental measurement exceeded 0.5 in a Class 3 survey unit, then an investigation would be initiated in accordance with LTP Chapter 5, section 5.6.4.6 (Table 5-25). In a Class 3 FSS unit, the result of the investigation could prompt the reclassification of the survey unit (or a portion of the survey unit).

Embedded pipe survey units have a relatively small surface area, which leads to OpDCGLs that are higher than the wall/floor OpDCGLs. The reason for this fact is that the total internal surface area of the embedded pipe survey unit in a given basement is much less than the total wall/floor surface area of the basement containing them. To eliminate the potential for activity levels in embedded pipe that could lead to releases greater than surrounding walls and floors, the following remediation and grouting action levels were applied to measurements of surface activity in embedded pipe.

  • If maximum activity exceeded the BcDCGLEP from Table 2 (SOF >1), then remediation was performed.
  • If the maximum activity in an embedded pipe exceeded the surface OpDCGLB from LTP Chapter 5, Table 5-4 (SOF>1) in the building that contains it, but is below the BcDCGLEP from Table 2, then the embedded pipe was grouted.
  • If an embedded pipe was remediated and the maximum activity continued to exceed the surface OpDCGLB from LTP Chapter 5, Table 5-4 (SOF>1), but is less than the OpDCGLEP from Table 2, then the embedded pipe was grouted.
  • If the maximum activity was below the surface OpDCGLB from LTP Chapter 5, Table 5-4 (SOF>1), then grouting of the pipe was not required.

The instrumentation used for the FSS of the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe was the Ludlum Model 2350-1 and the Model 44-159 detector. The instrumentation sensitivities are provided in Chapter 5 of the LTP, which is reproduced below as Table 5.

Table 5 - Typical FSS Instrument Detection Sensitivities BKGD Typical Typical Count Instrument count Instrument Static MDC Scan MDC Radiation BKGD Time

/Detector time Efficiency (dpm/100 cm2) (dpm/100 cm2)

(cpm) (1)(2) (min.)

(min.)

Ludlum 2350-1/

44-159 Gamma 1 700 0.024 1 5,250 N/A (1) Typical calibration source used is Cs-137. The efficiency is determined by counting the source with the detector in a fixed position from the source (reproducible geometry). The t value is based on ISO-7503-1 and conditions noted for each detector.

(2) The efficiency varies for the pipe detectors depending on the pipe diameter used. The efficiency used for the table is the average efficiency value for the pipe diameters. The detectors and diameters are: Model 44-159: 2-4 in. dia., Model 44-157: 4-8 in. dia., Model 44-162: 8-12 in. diameter.

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 In compliance with ZS-LT-01, Quality Assurance Project Plan (for Characterization and FSS) (QAPP) (Reference 10), replicate measurements were to be performed on 5%

of the static measurement locations.

Table 6 - Synopsis of Survey Design FEATURE DESIGN CRITERIA BASIS 4

Survey Unit Area 548.95 ft2 (51 m2) 524.21 12 /

Number of Static 52 10% areal coverage, Class 3 Measurements Measurement As needed to obtain sufficient 10% areal coverage, Class 3 Spacing measurements for 10% areal coverage

  • Co 2.12E+08 pCi/m2
  • Cs-134 - 4.08E+07 pCi/m2 Operational DCGLs for Unit 1 and Unit 2 Tendon Tunnel DCGLs
  • Cs-137 -5.34E+07 pCi/m2 Embedded Pipe,
  • Ni-63 -5.44E+09 pCi/m2 (LTP Chapter 5, Table 5-12)
  • Sr-90 -1.94E+06 pCi/m2 Gross Gamma DCGL adjusted for HTD HTD ROC Analysis LTP 5.7.1.9 based on the isotopic mixture Measurement

>0.5 Gross Gamma Operational DCGL (LTP Chapter 5, Table 5-25)

Investigation Level Scan Survey Area N/A LTP 5.7.1.9 Coverage replicate measurements will be QC performed on 5% of the static QAPP measurement locations

6. SURVEY IMPLEMENTATION Survey instructions for this FSS were incorporated into and performed in accordance with FSS Sample Plan #S3-06211AF, which was developed in accordance with ZionSolutions procedure ZS-LT-300-001-001. The FSS unit was inspected and controlled in accordance with ZionSolutions procedure ZS-LT-300-001-003, Isolation and Control for Final Status Survey (Reference 11).

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 The approach used for the radiological survey of the interior surfaces of the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe involved the insertion of a 1 x 1 cesium iodide detector that was attached to the SeeSnake camera system and transported through the pipe to the maximum deployment length, or to a location of drain drop. A simple push-pull methodology was used, whereby the position of the detector in the piping system could be easily determined in a reproducible manner. Video footage was tabulated on the SeeSnake, then measurements were obtained at 10-foot intervals while backing out of the pipe section.

A background value was also determined for the detector/instrument combination to be used prior to deployment. The background value was obtained at the location where the pre-use response check of the instrument was performed. The background value was primarily used to ensure that the detector had not become cross-contaminated by any previous use. Background was not subtracted from any measurement.

Daily prior to use and daily following use, each detector was subjected to an Operational Response Check in accordance with procedure ZS-LT-300-001-006, Radiation Surveys of Pipe Interiors Using Sodium/Cesium Iodide Detectors (Reference 12). The Daily Operational Response Check compared the background response and the response to check sources ranges established for normal background and detector source response to ensure that the detector was working properly.

Surveys of the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe were performed from April 2 through April 4, 2018. The survey was completed in 3 days. The piping was accessed through the floor drains located in the Tendon Tunnel, numbered M18 through M23.

Due to blockages in the piping from debris and water, only 207 feet of piping was accessible for survey. The distance between static measurements was reduced from 10 feet to 3 feet (M18 and M19) or 5 feet (M22, M23) to insure enough data points were collected to meet the 10 % areal coverage requirement from the survey design. A total of 58 readings were obtained. The 58 readings obtained represent 11.1% of the pipe interior surface. Table 7 summarizes the data collected:

Table 7 - Survey Data Collected

  1. of Length Pipe Run Measurements Comment Surveyed Taken Debris blocked the line at 50. 2 additional readings taken with M23 55 feet 13 access at M22, 75 and 70. All readings taken at 5 intervals.

Pipe entered at M22 toward M21. Debris blocked the line at 60.

M22 60 feet 13, 1QC Readings taken at 5 intervals.

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 Table 7 (continued) - Survey Data Collected

  1. of Length Pipe Run Measurements Comment Surveyed Taken Pipe entered at M19 towards M18. Debris blocked the line at M18 48 feet 16, 1QC
48. Readings taken at 3 intervals.

Pipe entered at M20 towards M19. Debris blocked the line at M19 44 feet 16, 1QC

44. Readings taken at 3 intervals.

M20, M21 0 feet 0 Filled with water Total 207 feet 58, 3QC The instrument and detector used for this survey are presented in Table 8. The instrument and detector were verified to be properly calibrated prior to use.

Table 8 - Instrument and Detector Instrument/ Calibration Due Serial #

Detector Type Date Ludlum 2350-1 304708 05/01/18 Ludlum 44-159 PR327896 05/01/18 Daily prior to use (Pre-Test) and daily upon completion of surveys (Post-Test), response checks were performed in accordance with procedure ZS-LT-300-001-006 for each detector and data logger pairing. In addition, all instruments and detectors were physically inspected for mechanical damage as part of the response check process.

During the FSS, no instances were encountered where an instrument and/or detector failed a Pre or Post response check or were found to be physically damaged during the inspection.

7. SURVEY RESULTS After completion of the FSS measurements in the pipe, the sample plan was reviewed to confirm the completeness of the survey and, the survey data was validated in accordance with procedure ZS-LT-300-001-004, Final Status Survey Data Assessment (Reference 13). Data processing included converting measurement data into reporting units, validating instrument applicability and sensitivity, calculating relevant statistical quantities, and verification that all DQO had been met. In accordance with the procedure, a preliminary Data Assessment was prepared.

The primary gamma-emitting ROC for the FSS of the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe FSS unit are Co-60, Cs-134 and Cs-137. Ni-63 and Sr-90 are also ROC for the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe. Ni-63

[15]

FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 is inferred from the measured concentration of Co-60, while Sr-90 is inferred from the measured concentration of Cs-137.

All measurements were less than 50% of the OpDCGL, meeting the requirement for a Class 3 area. The mean of the OpSOF for all 58 samples was 0.018.

The activity in this pipe was also compared to the OpDCGLB for the building that contained it. According to Table 5-20 of the LTP, the Tendon Tunnel drains are included with both the Containment and Turbine Buildings. One (1) sample had a SOF greater than 1 when compared to the OpDCGLB for the Turbine Building. This one pipe section, M22, was grouted. No dose reduction was claimed as a result of the grouting. The results of this comparison for all other samples show that the SOF for all samples were below one (<1) when compared to the OpDCGLB for both basements.

The results of the data assessment for the embedded floor drain pipe are provided in Attachment 2. A statistical summary of the data is presented in Table 9.

The data collected passed the Sign Test. The result of the Sign Test is provided in Attachment 3.

Table 9 - Unit 1 Tendon Tunnel Embedded Floor Drain Pipe - Statistical Quantities Individual Measurement Metrics Total Number of Systematic Measurements = 58 Number of Quality Control Measurements = 3 Number of Judgmental/Investigational Measurements = 0 Total Number of Measurements = 61 Mean Systematic Measurement OpSOF = 0.018 Max Individual Systematic Measurement OpSOF = 0.074 Number of Systematic Measurements with OpSOF >0.5 = 0 Statistical Quantities - Systematic Measurement Population MEAN MEDIAN MAX MIN ST. DEV. BcDCGLEP ROC BcSOF (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

Co-60 1.11E+04 1.03E+04 4.46E+04 8.52E+03 4.77E+03 1.06E+10 0.000 Ni-63 2.00E+06 1.86E+06 8.06E+06 1.54E+06 8.61E+05 2.72E+11 0.000 Sr-90 1.82E+03 1.69E+03 7.31E+03 1.40E+03 7.81E+02 9.70E+07 0.000 Cs-134 1.21E+02 1.12E+02 4.85E+02 9.26E+01 5.19E+01 2.04E+09 0.000 Cs-137 9.08E+05 8.44E+05 3.66E+06 6.98E+05 3.91E+05 2.67E+09 0.000 The mean BcSOF for the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe FSS unit based on the mean concentration for each ROC as measured by the systematic

[16]

FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 sample population when compared against the BcDCGLPN is 0.000. This value equates to a dose of 0.009 mrem/yr.

8. QUALITY CONTROL In compliance with ZS-LT-01, replicate measurements were performed on 5% of the survey locations chosen at random. Three (3) replicate measurements were taken. Using the acceptance criteria specified in section 4.1.2 of ZS-LT-01, there was acceptable agreement between the replicate readings and the original readings. Refer to Attachment 4 for quality control analysis results.
9. INVESTIGATIONS AND RESULTS As all measurements in the accessible pipe interior surface area were below an OpSOF of 0.5, no investigations were required or performed.
10. REMEDIATION AND RESULTS No remediation was performed in this piping survey unit.
11. CHANGES FROM THE SURVEY PLAN The access to the drain piping system was changed. The survey design called for the piping to be accessed from the Buttress Pits. Instead, an entry was made to the Tendon Tunnel, where the drain piping was accessed through the floor drains in the tunnel.

The isotopic mix for Containment was used during the design of the FSS. Following acquisition of the survey data and during the data quality assessment (DQA) process, it was determined that the correct mixture for this survey unit was the Auxiliary Building mixture verses the Containment mixture that was used. An assessment of the difference between survey designs using each mixture determined that the use of the Containment mixture was conservative and no additional measurements or changes were necessary.

During the pre-survey inspection of the pipe interior, it was discovered that the pipe was obstructed in several places and submerged in others. Consequently, only 207 feet of the pipe length of 549 feet was accessible for survey. In order to ensure 10% areal coverage as required by the survey design, the spacing between static measurements was reduced from 10 feet to 3 feet in pipe sections M18 and M19 and 5 feet in sections M23 and M22.

12. DATA QUALITY ASSESSMENT In accordance with procedure ZS-LT-300-001-004, the DQOs, sample design, and data were reviewed for completeness, accuracy and consistency. Documentation was complete and legible. The FSS unit was properly classified as Class 3. All measurement results were individually reviewed and validated. The number of measurements was

[17]

FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 sufficient to meet the requirement of 10% areal coverage of accessible surfaces. The instrumentation used to perform the FSS were in calibration, capable of detecting the activity with an adequate Minimum Detectable Concentration (MDC) and successfully response checked prior to and following use. An adequate number of replicate measurements were taken and the results meet the acceptance criteria as specified in the QAPP.

The data for Gross Gamma Activity is represented graphically through a frequency plot and a quantile plot. All graphical representations are provided in Attachment 5.

13. ANOMALIES No anomalies were observed during the performance or analyses of the survey.
14. CONCLUSION Fifty-eight (58) static measurements were taken in the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe, taken at 3 or 5-foot intervals. The length of pipe in the Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe was 524.21 linear feet. Due to obstruction, 207 feet was accessible for survey. A sufficient number of measurements were acquired to meet the areal coverage requirement of 10% of the surface area.

All of the measurement results were less than an OpSOF of 0.5 when compared to the OpDCGLEP. The average OpSOF for the survey unit was 0.018. The measured radiological conditions met the conditions for a Class 3 survey unit.

The Sign Test was passed, and the Null Hypothesis was rejected.

The mean BcSOF for this survey unit is 0.000. The dose contribution from embedded pipe in survey unit 06211, Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe, is 0.009 mrem/yr TEDE, based on the average concentration of the ROC in samples used for non-parametric statistical sampling.

Survey unit 06211, Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe, is acceptable for unrestricted release.

15. REFERENCES
1. ZionSolutions procedure ZS-LT-300-001-005, Final Status Survey Data Reporting
2. Zion Station Restoration Project License Termination Plan
3. ZionSolutions procedure ZS-LT-300-001-001, Final Status Survey Package Development
4. NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual

[18]

FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211

5. ZionSolutions procedure ZS-LT-300-001-002, Survey Unit Classification
6. Zion Station Historical Site Assessment
7. ZionSolutions TSD 14-016, Description of Embedded Piping, Penetrations, and Buried Pipe to Remain in Zion End State
8. ZionSolutions TSD 17-004, Operational Derived Concentration Guideline Levels for Final Status Survey
9. ZionSolutions TSD 14-019, Radionuclides of Concern for Soil and Basement Fill Model Source Terms
10. ZionSolutions procedure ZS-LT-01, Quality Assurance Project Plan (for Characterization and FSS)
11. ZionSolutions procedure ZS-LT-300-001-003, Isolation and Control for Final Status Survey
12. ZionSolutions procedure ZS-LT-300-001-006, Radiation Surveys of Pipe Interiors Using Sodium/Cesium Iodide Detectors
13. ZionSolutions procedure ZS-LT-300-001-004, Final Status Survey Data Assessment
16. ATTACHMENTS Attachment 1 - Tendon Tunnel Embedded Drain Layout Attachment 2 - Measurement Data Attachment 3 - Sign Test Attachment 4 - QC Data Attachment 5 - Graphical Presentations

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ATTACHMENT 1 TENDON TUNNEL EMBEDDED DRAIN LAYOUT

[20]

FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 M23 M22 M18 M21 M19 M20

[21]

ATTACHMENT 2 MEASUREMENT DATA

[22]

FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 Gross Co-60 Cs-134 Cs-137 Ni-63 Sr-90 Pipe Gamma Co-60 Cs-134 Cs-137 Ni-63 Sr-90 Position Conc. Conc. Conc. Conc. Conc. OpSOF Section Activity OpSOF OpSOF OpSOF OpSOF OpSOF (pCi/m2) 2 (pCi/m ) 2 (pCi/m ) 2 (pCi/m ) 2 (pCi/m ) 2 (pCi/m )

1 1.12E+06 1.35E+04 1.46E+02 1.10E+06 2.43E+06 2.20E+03 6.35E-05 3.59E-06 2.06E-02 4.46E-04 1.14E-03 0.0223 2 7.79E+05 9.40E+03 1.02E+02 7.70E+05 1.70E+06 1.54E+03 4.43E-05 2.50E-06 1.44E-02 3.12E-04 7.94E-04 0.0156 3 9.16E+05 1.11E+04 1.20E+02 9.05E+05 1.99E+06 1.81E+03 5.21E-05 2.95E-06 1.69E-02 3.67E-04 9.33E-04 0.0183 4 9.34E+05 1.13E+04 1.22E+02 9.23E+05 2.03E+06 1.85E+03 5.32E-05 3.00E-06 1.73E-02 3.74E-04 9.51E-04 0.0187 5 9.62E+05 1.16E+04 1.26E+02 9.51E+05 2.10E+06 1.90E+03 5.48E-05 3.09E-06 1.78E-02 3.85E-04 9.80E-04 0.0192 6 8.09E+05 9.77E+03 1.06E+02 8.00E+05 1.76E+06 1.60E+03 4.61E-05 2.60E-06 1.50E-02 3.24E-04 8.24E-04 0.0162 M023 7 8.22E+05 9.92E+03 1.08E+02 8.12E+05 1.79E+06 1.62E+03 4.68E-05 2.64E-06 1.52E-02 3.29E-04 8.37E-04 0.0164 8 7.93E+05 9.57E+03 1.04E+02 7.84E+05 1.73E+06 1.57E+03 4.52E-05 2.55E-06 1.47E-02 3.18E-04 8.08E-04 0.0159 9 7.99E+05 9.64E+03 1.05E+02 7.89E+05 1.74E+06 1.58E+03 4.55E-05 2.57E-06 1.48E-02 3.20E-04 8.13E-04 0.0160 10 8.91E+05 1.08E+04 1.17E+02 8.80E+05 1.94E+06 1.76E+03 5.07E-05 2.87E-06 1.65E-02 3.57E-04 9.08E-04 0.0178 11 1.59E+06 1.92E+04 2.08E+02 1.57E+06 3.46E+06 3.14E+03 9.04E-05 5.11E-06 2.94E-02 6.36E-04 1.62E-03 0.0317 12 8.54E+05 1.03E+04 1.12E+02 8.44E+05 1.86E+06 1.69E+03 4.86E-05 2.74E-06 1.58E-02 3.42E-04 8.70E-04 0.0171 13 8.56E+05 1.03E+04 1.12E+02 8.45E+05 1.86E+06 1.69E+03 4.87E-05 2.75E-06 1.58E-02 3.42E-04 8.71E-04 0.0171 1 3.70E+06 4.46E+04 4.85E+02 3.66E+06 8.06E+06 7.31E+03 2.11E-04 1.19E-05 6.85E-02 1.48E-03 3.77E-03 0.0739 2 1.08E+06 1.30E+04 1.41E+02 1.06E+06 2.35E+06 2.13E+03 6.14E-05 3.47E-06 1.99E-02 4.31E-04 1.10E-03 0.0215 3 8.50E+05 1.03E+04 1.12E+02 8.40E+05 1.85E+06 1.68E+03 4.84E-05 2.73E-06 1.57E-02 3.40E-04 8.66E-04 0.0170 4 7.77E+05 9.38E+03 1.02E+02 7.68E+05 1.69E+06 1.54E+03 4.42E-05 2.50E-06 1.44E-02 3.11E-04 7.92E-04 0.0155 5 8.91E+05 1.08E+04 1.17E+02 8.80E+05 1.94E+06 1.76E+03 5.07E-05 2.87E-06 1.65E-02 3.57E-04 9.08E-04 0.0178 6 9.27E+05 1.12E+04 1.22E+02 9.16E+05 2.02E+06 1.83E+03 5.28E-05 2.98E-06 1.71E-02 3.71E-04 9.44E-04 0.0185 M022 7 9.20E+05 1.11E+04 1.21E+02 9.09E+05 2.00E+06 1.82E+03 5.23E-05 2.96E-06 1.70E-02 3.68E-04 9.37E-04 0.0184 8 8.09E+05 9.77E+03 1.06E+02 8.00E+05 1.76E+06 1.60E+03 4.61E-05 2.60E-06 1.50E-02 3.24E-04 8.24E-04 0.0162 9 7.86E+05 9.49E+03 1.03E+02 7.77E+05 1.71E+06 1.55E+03 4.48E-05 2.53E-06 1.45E-02 3.15E-04 8.01E-04 0.0157 10 9.14E+05 1.10E+04 1.20E+02 9.03E+05 1.99E+06 1.81E+03 5.20E-05 2.94E-06 1.69E-02 3.66E-04 9.31E-04 0.0183 11 8.59E+05 1.04E+04 1.13E+02 8.49E+05 1.87E+06 1.70E+03 4.89E-05 2.76E-06 1.59E-02 3.44E-04 8.75E-04 0.0172 12 8.81E+05 1.06E+04 1.15E+02 8.70E+05 1.92E+06 1.74E+03 5.01E-05 2.83E-06 1.63E-02 3.52E-04 8.97E-04 0.0176 13 9.00E+05 1.09E+04 1.18E+02 8.89E+05 1.96E+06 1.78E+03 5.12E-05 2.89E-06 1.67E-02 3.60E-04 9.17E-04 0.0180

[23]

FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 Gross Co-60 Cs-134 Cs-137 Ni-63 Sr-90 Pipe Gamma Co-60 Cs-134 Cs-137 Ni-63 Sr-90 Position Conc. Conc. Conc. Conc. Conc. OpSOF Section Activity OpSOF OpSOF OpSOF OpSOF OpSOF (pCi/m2) 2 (pCi/m ) 2 (pCi/m ) 2 (pCi/m ) 2 (pCi/m ) 2 (pCi/m )

1 7.61E+05 9.19E+03 9.99E+01 7.52E+05 1.66E+06 1.50E+03 4.33E-05 2.45E-06 1.41E-02 3.05E-04 7.75E-04 0.0152 2 7.85E+05 9.47E+03 1.03E+02 7.75E+05 1.71E+06 1.55E+03 4.47E-05 2.52E-06 1.45E-02 3.14E-04 7.99E-04 0.0157 3 7.29E+05 8.80E+03 9.57E+01 7.21E+05 1.59E+06 1.44E+03 4.15E-05 2.34E-06 1.35E-02 2.92E-04 7.43E-04 0.0146 4 7.54E+05 9.10E+03 9.89E+01 7.45E+05 1.64E+06 1.49E+03 4.29E-05 2.42E-06 1.40E-02 3.02E-04 7.68E-04 0.0151 5 8.13E+05 9.81E+03 1.07E+02 8.03E+05 1.77E+06 1.61E+03 4.63E-05 2.61E-06 1.50E-02 3.25E-04 8.28E-04 0.0162 6 7.56E+05 9.12E+03 9.92E+01 7.47E+05 1.65E+06 1.49E+03 4.30E-05 2.43E-06 1.40E-02 3.03E-04 7.70E-04 0.0151 7 7.29E+05 8.80E+03 9.57E+01 7.21E+05 1.59E+06 1.44E+03 4.15E-05 2.34E-06 1.35E-02 2.92E-04 7.43E-04 0.0146 8 7.72E+05 9.32E+03 1.01E+02 7.63E+05 1.68E+06 1.53E+03 4.39E-05 2.48E-06 1.43E-02 3.09E-04 7.86E-04 0.0154 M018 9 7.76E+05 9.36E+03 1.02E+02 7.66E+05 1.69E+06 1.53E+03 4.41E-05 2.49E-06 1.43E-02 3.10E-04 7.90E-04 0.0155 10 8.08E+05 9.75E+03 1.06E+02 7.98E+05 1.76E+06 1.60E+03 4.60E-05 2.60E-06 1.49E-02 3.23E-04 8.23E-04 0.0161 11 7.06E+05 8.52E+03 9.26E+01 6.98E+05 1.54E+06 1.40E+03 4.02E-05 2.27E-06 1.31E-02 2.83E-04 7.19E-04 0.0141 12 7.45E+05 8.99E+03 9.78E+01 7.36E+05 1.62E+06 1.47E+03 4.24E-05 2.40E-06 1.38E-02 2.98E-04 7.59E-04 0.0149 13 7.44E+05 8.97E+03 9.75E+01 7.35E+05 1.62E+06 1.47E+03 4.23E-05 2.39E-06 1.38E-02 2.98E-04 7.57E-04 0.0149 14 7.97E+05 9.62E+03 1.05E+02 7.87E+05 1.74E+06 1.57E+03 4.54E-05 2.56E-06 1.47E-02 3.19E-04 8.12E-04 0.0159 15 7.19E+05 8.67E+03 9.43E+01 7.10E+05 1.56E+06 1.42E+03 4.09E-05 2.31E-06 1.33E-02 2.88E-04 7.32E-04 0.0144 16 7.83E+05 9.44E+03 1.03E+02 7.73E+05 1.70E+06 1.55E+03 4.46E-05 2.52E-06 1.45E-02 3.13E-04 7.97E-04 0.0156 1 1.06E+06 1.28E+04 1.39E+02 1.04E+06 2.30E+06 2.09E+03 6.01E-05 3.40E-06 1.95E-02 4.23E-04 1.08E-03 0.0211 2 9.64E+05 1.16E+04 1.26E+02 9.52E+05 2.10E+06 1.90E+03 5.49E-05 3.10E-06 1.78E-02 3.86E-04 9.82E-04 0.0193 3 8.82E+05 1.06E+04 1.16E+02 8.72E+05 1.92E+06 1.74E+03 5.02E-05 2.84E-06 1.63E-02 3.53E-04 8.99E-04 0.0176 4 8.34E+05 1.01E+04 1.09E+02 8.24E+05 1.82E+06 1.65E+03 4.75E-05 2.68E-06 1.54E-02 3.34E-04 8.50E-04 0.0167 5 9.34E+05 1.13E+04 1.22E+02 9.23E+05 2.03E+06 1.85E+03 5.32E-05 3.00E-06 1.73E-02 3.74E-04 9.51E-04 0.0187 M019 6 9.20E+05 1.11E+04 1.21E+02 9.09E+05 2.00E+06 1.82E+03 5.23E-05 2.96E-06 1.70E-02 3.68E-04 9.37E-04 0.0184 7 1.02E+06 1.24E+04 1.34E+02 1.01E+06 2.23E+06 2.02E+03 5.83E-05 3.29E-06 1.90E-02 4.10E-04 1.04E-03 0.0205 8 8.43E+05 1.02E+04 1.11E+02 8.33E+05 1.84E+06 1.67E+03 4.80E-05 2.71E-06 1.56E-02 3.38E-04 8.59E-04 0.0168 9 8.68E+05 1.05E+04 1.14E+02 8.58E+05 1.89E+06 1.72E+03 4.94E-05 2.79E-06 1.61E-02 3.47E-04 8.84E-04 0.0173 10 7.67E+05 9.25E+03 1.01E+02 7.57E+05 1.67E+06 1.51E+03 4.36E-05 2.46E-06 1.42E-02 3.07E-04 7.81E-04 0.0153 11 1.06E+06 1.28E+04 1.39E+02 1.05E+06 2.30E+06 2.09E+03 6.02E-05 3.40E-06 1.96E-02 4.24E-04 1.08E-03 0.0211

[24]

FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 Gross Co-60 Cs-134 Cs-137 Ni-63 Sr-90 Pipe Gamma Co-60 Cs-134 Cs-137 Ni-63 Sr-90 Position Conc. Conc. Conc. Conc. Conc. OpSOF Section Activity OpSOF OpSOF OpSOF OpSOF OpSOF (pCi/m2) 2 (pCi/m ) 2 (pCi/m ) 2 (pCi/m ) 2 (pCi/m ) 2 (pCi/m )

12 9.84E+05 1.19E+04 1.29E+02 9.72E+05 2.14E+06 1.94E+03 5.60E-05 3.16E-06 1.82E-02 3.94E-04 1.00E-03 0.0197 13 9.70E+05 1.17E+04 1.27E+02 9.58E+05 2.11E+06 1.92E+03 5.52E-05 3.12E-06 1.79E-02 3.88E-04 9.87E-04 0.0194 M019 14 8.61E+05 1.04E+04 1.13E+02 8.51E+05 1.87E+06 1.70E+03 4.90E-05 2.77E-06 1.59E-02 3.45E-04 8.77E-04 0.0172 (cont) 15 9.06E+05 1.09E+04 1.19E+02 8.95E+05 1.97E+06 1.79E+03 5.15E-05 2.91E-06 1.68E-02 3.62E-04 9.22E-04 0.0181 16 8.75E+05 1.06E+04 1.15E+02 8.65E+05 1.91E+06 1.73E+03 4.98E-05 2.81E-06 1.62E-02 3.50E-04 8.91E-04 0.0175

[25]

ATTACHMENT 3 SIGN TEST

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 SIGN TEST Pipe Co-60 Cs-134 Cs-137 Ni-63 Sr-90 SOF Position 1-Ws Sign Section SOF SOF SOF SOF SOF (Ws) 1 6.35E-05 3.59E-06 2.06E-02 4.46E-04 1.14E-03 0.0223 0.98 +1 2 4.43E-05 2.50E-06 1.44E-02 3.12E-04 7.94E-04 0.0156 0.98 +1 3 5.21E-05 2.95E-06 1.69E-02 3.67E-04 9.33E-04 0.0183 0.98 +1 4 5.32E-05 3.00E-06 1.73E-02 3.74E-04 9.51E-04 0.0187 0.98 +1 5 5.48E-05 3.09E-06 1.78E-02 3.85E-04 9.80E-04 0.0192 0.98 +1 6 4.61E-05 2.60E-06 1.50E-02 3.24E-04 8.24E-04 0.0162 0.98 +1 M023 7 4.68E-05 2.64E-06 1.52E-02 3.29E-04 8.37E-04 0.0164 0.98 +1 8 4.52E-05 2.55E-06 1.47E-02 3.18E-04 8.08E-04 0.0159 0.98 +1 9 4.55E-05 2.57E-06 1.48E-02 3.20E-04 8.13E-04 0.0160 0.98 +1 10 5.07E-05 2.87E-06 1.65E-02 3.57E-04 9.08E-04 0.0178 0.98 +1 11 9.04E-05 5.11E-06 2.94E-02 6.36E-04 1.62E-03 0.0317 0.97 +1 12 4.86E-05 2.74E-06 1.58E-02 3.42E-04 8.70E-04 0.0171 0.98 +1 13 4.87E-05 2.75E-06 1.58E-02 3.42E-04 8.71E-04 0.0171 0.98 +1 1 2.11E-04 1.19E-05 6.85E-02 1.48E-03 3.77E-03 0.0739 0.93 +1 2 6.14E-05 3.47E-06 1.99E-02 4.31E-04 1.10E-03 0.0215 0.98 +1 3 4.84E-05 2.73E-06 1.57E-02 3.40E-04 8.66E-04 0.0170 0.98 +1 4 4.42E-05 2.50E-06 1.44E-02 3.11E-04 7.92E-04 0.0155 0.98 +1 5 5.07E-05 2.87E-06 1.65E-02 3.57E-04 9.08E-04 0.0178 0.98 +1 6 5.28E-05 2.98E-06 1.71E-02 3.71E-04 9.44E-04 0.0185 0.98 +1 M022 7 5.23E-05 2.96E-06 1.70E-02 3.68E-04 9.37E-04 0.0184 0.98 +1 8 4.61E-05 2.60E-06 1.50E-02 3.24E-04 8.24E-04 0.0162 0.98 +1 9 4.48E-05 2.53E-06 1.45E-02 3.15E-04 8.01E-04 0.0157 0.98 +1 10 5.20E-05 2.94E-06 1.69E-02 3.66E-04 9.31E-04 0.0183 0.98 +1 11 4.89E-05 2.76E-06 1.59E-02 3.44E-04 8.75E-04 0.0172 0.98 +1 12 5.01E-05 2.83E-06 1.63E-02 3.52E-04 8.97E-04 0.0176 0.98 +1 13 5.12E-05 2.89E-06 1.67E-02 3.60E-04 9.17E-04 0.0180 0.98 +1 1 4.33E-05 2.45E-06 1.41E-02 3.05E-04 7.75E-04 0.0152 0.98 +1 2 4.47E-05 2.52E-06 1.45E-02 3.14E-04 7.99E-04 0.0157 0.98 +1 3 4.15E-05 2.34E-06 1.35E-02 2.92E-04 7.43E-04 0.0146 0.99 +1 4 4.29E-05 2.42E-06 1.40E-02 3.02E-04 7.68E-04 0.0151 0.98 +1 5 4.63E-05 2.61E-06 1.50E-02 3.25E-04 8.28E-04 0.0162 0.98 +1 6 4.30E-05 2.43E-06 1.40E-02 3.03E-04 7.70E-04 0.0151 0.98 +1 7 4.15E-05 2.34E-06 1.35E-02 2.92E-04 7.43E-04 0.0146 0.99 +1 8 4.39E-05 2.48E-06 1.43E-02 3.09E-04 7.86E-04 0.0154 0.98 +1 M018 9 4.41E-05 2.49E-06 1.43E-02 3.10E-04 7.90E-04 0.0155 0.98 +1 10 4.60E-05 2.60E-06 1.49E-02 3.23E-04 8.23E-04 0.0161 0.98 +1 11 4.02E-05 2.27E-06 1.31E-02 2.83E-04 7.19E-04 0.0141 0.99 +1 12 4.24E-05 2.40E-06 1.38E-02 2.98E-04 7.59E-04 0.0149 0.99 +1 13 4.23E-05 2.39E-06 1.38E-02 2.98E-04 7.57E-04 0.0149 0.99 +1 14 4.54E-05 2.56E-06 1.47E-02 3.19E-04 8.12E-04 0.0159 0.98 +1 15 4.09E-05 2.31E-06 1.33E-02 2.88E-04 7.32E-04 0.0144 0.99 +1 16 4.46E-05 2.52E-06 1.45E-02 3.13E-04 7.97E-04 0.0156 0.98 +1 1 6.01E-05 3.40E-06 1.95E-02 4.23E-04 1.08E-03 0.0211 0.98 +1 2 5.49E-05 3.10E-06 1.78E-02 3.86E-04 9.82E-04 0.0193 0.98 +1 M019 3 5.02E-05 2.84E-06 1.63E-02 3.53E-04 8.99E-04 0.0176 0.98 +1 4 4.75E-05 2.68E-06 1.54E-02 3.34E-04 8.50E-04 0.0167 0.98 +1 5 5.32E-05 3.00E-06 1.73E-02 3.74E-04 9.51E-04 0.0187 0.98 +1

[27]

FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 Pipe Co-60 Cs-134 Cs-137 Ni-63 Sr-90 SOF Position 1-Ws Sign Section SOF SOF SOF SOF SOF (Ws) 6 5.23E-05 2.96E-06 1.70E-02 3.68E-04 9.37E-04 0.0184 0.98 +1 7 5.83E-05 3.29E-06 1.90E-02 4.10E-04 1.04E-03 0.0205 0.98 +1 8 4.80E-05 2.71E-06 1.56E-02 3.38E-04 8.59E-04 0.0168 0.98 +1 9 4.94E-05 2.79E-06 1.61E-02 3.47E-04 8.84E-04 0.0173 0.98 +1 10 4.36E-05 2.46E-06 1.42E-02 3.07E-04 7.81E-04 0.0153 0.98 +1 M019 11 6.02E-05 3.40E-06 1.96E-02 4.24E-04 1.08E-03 0.0211 0.98 +1 (cont) 12 5.60E-05 3.16E-06 1.82E-02 3.94E-04 1.00E-03 0.0197 0.98 +1 13 5.52E-05 3.12E-06 1.79E-02 3.88E-04 9.87E-04 0.0194 0.98 +1 14 4.90E-05 2.77E-06 1.59E-02 3.45E-04 8.77E-04 0.0172 0.98 +1 15 5.15E-05 2.91E-06 1.68E-02 3.62E-04 9.22E-04 0.0181 0.98 +1 16 4.98E-05 2.81E-06 1.62E-02 3.50E-04 8.91E-04 0.0175 0.98 +1 Number of Measurements = 58 Type I Error = .05 Number of Positive Differences (S+) = 58 Critical Value = 35 Survey unit MEETS the Acceptance Criteria YES

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ATTACHMENT 4 QC DATA

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 Replicate Measurement Assessment Form Survey Unit # 06211 Survey Unit Name Unit 1 Tendon Tunnel Embedded Floor Sample Plan # S1-06211A-F Drain Sample

Description:

Comparison of replicate measurements collected from measurement locations M018 (45 ft), M019 (45 ft) and M022 (60 ft)

STANDARD COMPARISON ID Activity Value +20% -20% ID Activity Value Acceptable (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (Y/N)

M018 (45 ft) 7.83E+05 9.39E+05 6.26E+05 M018 (45 ft) QC 6.69E+05 N M019 (45 ft) 8.75E+05 1.05E+06 7.00E+05 M019 (45 ft) QC 9.38E+05 Y M022 (60 ft) 9.00E+05 1.08E+06 7.20E+05 M022 (60 ft) QC 8.86E+05 Y Comments/Corrective Actions: There was The acceptance criteria for replicate static acceptable agreement between the standard measurements and scan surveys are that the measurement and the replicate measurement. Based same conclusion is reached for each on the professional judgment of the Radiological measurement. This is defined as + 20% of Engineer, the same conclusion was reached for each the standard.

measurement. No further action is necessary.

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ATTACHMENT 5 GRAPHICAL PRESENTATIONS

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 QUANTILE PLOT for Gross Gamma Activity Survey Unit: 06211 Survey Unit Name: Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe Mean: 9.20E+05 pCi/m2 Quantile Plot For Gross Gamma Activity 4.21E+06 3.71E+06 Gross Activity (pCi/m2) 3.21E+06 2.71E+06 2.21E+06 1.71E+06 1.21E+06 7.06E+05 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

Percentage

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 Histogram for Gross Gamma Activity Survey Unit: 06211 Survey Unit Name: Unit 1 Tendon Tunnel 547 foot Embedded Floor Drain Pipe Mean: 9.20E+05 pCi/g Median: 8.55E+05 pCi/g ST DEV: 3.95E+05 Skew: 6.389 Histogram 60 55 50 40 Frequency 30 20 10 1 1 0 0 0 0 1 0

1.08E+06 1.45E+06 1.83E+06 2.20E+06 2.58E+06 2.95E+06 3.33E+06 3.70E+06 Bin Upper Observation Observation Value Frequency  %

1.08E+06 55 94.8%

1.45E+06 1 1.7%

1.83E+06 1 1.7%

2.20E+06 0 0.0%

2.58E+06 0 0.0%

2.95E+06 0 0.0%

3.33E+06 0 0.0%

3.70E+06 1 1.7%

TOTAL 58 100%

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FSS RELEASE RECORD UNIT 1 TENDON TUNNEL EMBEDDED FLOOR DRAIN PIPE SURVEY UNIT 06211 Retrospective Power Curve for Survey Unit 06211

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