Text

Final Status Survey (FSS) Final Report - Phase 2, Part 1 - Unit 1 Containment Basement Survey Units 01100 and 01110
	ML19077A041
Person / Time
Site:	Zion File:ZionSolutions icon.png
Issue date:	02/28/2019
From:	Montt D; ZionSolutions
To:	; Office of Nuclear Material Safety and Safeguards
References
	ZS-2019-0017
	Download: ML19077A041 (241)
	v • d • e

ZION STATION RESTORATION PROJECT FINAL STATUS SURVEY RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100/01110

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 PREPARED BY / DATE: _________________________________________

2/28/2019 David Montt, Radiological Engineer 2/28/2019 REVIEWED BY / DATE: _________________________________________

G. L. Wood, Radiological Engineer APPROVED BY / DATE: _________________________________________

2/28/2019 D. Wojtkowiak, C/LT Manager

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 TABLE OF CONTENTS

1. EXECUTIVE

SUMMARY

................................................................................................ 8

2. SURVEY UNIT DESCRIPTION ...................................................................................... 9

3. CLASSIFICATION BASIS.............................................................................................. 16

4. DATA QUALITY OBJECTIVES (DQO) ...................................................................... 40

5. SURVEY DESIGN ............................................................................................................ 44

6. SURVEY IMPLEMENTATION ..................................................................................... 68

7. SURVEY RESULTS ......................................................................................................... 72

8. QUALITY CONTROL..................................................................................................... 93

9. INVESTIGATION AND RESULTS ............................................................................... 93

10. REMEDIATION AND RESULTS .................................................................................. 93

11. CHANGES FROM THE FINAL STATUS SURVEY PLAN ....................................... 93

12. DATA QUALITY ASSESSMENT (DQA) ..................................................................... 96

13. ANOMALIES .................................................................................................................... 97

14. COMPLIANCE EQUATION .......................................................................................... 97

15. CONCLUSION ............................................................................................................... 100

16. REFERENCES ................................................................................................................ 100

17. ATTACHMENTS ........................................................................................................... 101 ATTACHMENT 1 ............................................................................................................ 102 ATTACHMENT 2 ............................................................................................................ 112 ATTACHMENT 3 ............................................................................................................ 157 ATTACHMENT 4 ............................................................................................................ 166 ATTACHMENT 5 ............................................................................................................ 179 ATTACHMENT 6 ............................................................................................................ 203 ATTACHMENT 7 ............................................................................................................ 241

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 LIST OF TABLES Table 1 - Unit 1 Containment 568 Foot Elevation Concrete Core Sample Analysis Summary ..... 19 Table 2 - Unit 1 Containment 541 Foot Elevation Concrete Core Sample Analysis Summary ..... 20 Table 3 - Unit 1 Containment Concrete Core Samples - Eberline Laboratory Analysis ................ 21 Table 4 - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis ............................................................................................ 26 Table 5 - Unit 1 Containment Continuing Characterization Concrete Core Samples - Eberline Laboratory Analyses ....................................................................... 38 Table 6 - HTD Ratios Based on Continuing Characterization Concrete Core Samples ................. 39 Table 7 - Dose Significant Radionuclides and Mixture .................................................................. 42 Table 8 - Base Case DCGLs for Containment Basements (BcDCGLB) from LTP Chapter 5, Table 5-3 ....................................................................................................... 43 Table 9 - Operational DCGLs (OpDCGLB) for Containment Basements (pCi/m2) from LTP Chapter 5, Table 5-4 ....................................................................................................... 44 Table 10 - Number of ISOCS Measurements per FSS Unit based on Areal Coverage .................. 46 Table 11 - Adjusted Minimum Number of ISOCS Measurements per FSS Unit........................... 47 Table 12 - Surrogate Ratios for Containment ................................................................................. 48 Table 13 - FSS Confirmation Concrete Core Sample Analysis - Grade to 0.5 inch Depth ............ 51 Table 14 - FSS Confirmation Concrete Core Sample Analysis - Concentrations at Depth ........... 58 Table 15 - FSS Confirmation Concrete Core Sample Analysis Surrogate Ratios .......................... 61 Table 16 - Unit 1 Containment Under Vessel Concrete Area, Volume and Dimensions ............... 62 Table 17 - Unit 1 Containment Under Vessel Concrete HTD Inventory and Dose Based on FSS Confirmatory Core Samples .................................................................. 63 Table 18 - Unit 1 Containment Under Vessel FSS Confirmatory Core Samples Measured HTD Concentrations and SOF ..................................................................... 66 Table 19 - Investigation Levels....................................................................................................... 68 Table 20 - Synopsis of Survey Design ............................................................................................ 68 Table 21 - Unit 1 Containment Above 565 ft. Elevation - Measured Concentrations of ROC for FSS ............................................................................................................. 76 Table 22 - Unit 1 Containment Above 565 ft. Elevation - Statistical Quantities - Systematic Measurement Population .............................................................................................. 82 Table 23 - Unit 1 Containment Under Vessel Area - Measured Concentrations of ROC for FSS ............................................................................................................. 88 Table 24 - Unit 1 Containment Under Vessel Area - Statistical Quantities - Systematic Measurement Population .............................................................................................. 90 Table 25 - Unit 1 Containment Under Vessel Area - Post H-3 Concrete Removal Concrete Core Results................................................................................................... 92

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 LIST OF FIGURES Figure 1 - Containment Layout ....................................................................................................... 11 Figure 2 - Unit 1 Containment 565 Elevation ................................................................................ 12 Figure 3 - Unit 1 Containment Under Vessel ................................................................................. 13 Figure 4 - Unit 1 Containment Incore Tunnel ................................................................................ 14 Figure 5 - Unit 1 Containment Sloped Tunnel................................................................................ 15 Figure 6 - Unit 1 Containment 568 foot el. Concrete Core Sample Locations ............................... 22 Figure 7 - Unit 1 Containment 541 foot el. Concrete Core Sample Locations ............................... 23 Figure 8 - Unit 1 Containment Continuing Characterization Concrete Core Sample Location .... 25 Figure 9 - Unit 1 Containment FSS Confirmatory Concrete Core Sample Locations.................... 50 Figure 10 - Unit 1 Under Vessel In-Core Tunnel Remediation ...................................................... 70 Figure 11 - ISOCS Measurements of Unit 1 Containment Above 565 ft. Elevation ..................... 73 Figure 12 - Unit 1 Containment Above 565 ft. Elevation FSS Floor Measurement Locations ...... 74 Figure 13 - Unit 1 Containment Above 565 ft. Elevation FSS Wall Measurement Locations....... 75 Figure 14 - Unit 1 Under Vessel Concrete H-3 Concrete Remediation Area ................................. 86 Figure 15 - Unit 1 Containment Under Vessel FSS Measurement Locations ................................ 87 Figure 16 - Unit 1 Containment Under Vessel ORISE FSS Confirmatory Locations.................... 91

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 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-Fraction BFM Basement Fill Model CoC Chain-of-Custody DQA Data Quality Assessment DQO Data Quality Objective DCGL Derived Concentration Guideline Level EMC Elevated Measurement Comparison FSS Final Status Survey GPS Global Positioning System HTD Hard-to-Detect IC Insignificant Contributor LTP License Termination Plan LBGR Lower Bound of the Gray Region MARSSIM Multi-Agency Radiation Survey and Site Investigation Manual MDC Minimum Detectable Concentration MDCR Minimal Detectable Count Rate NAD North American Datum NaI Sodium Iodide OpDCGL Operational Derived Concentration Guideline Level OpSOF Operational Sum-of-Fraction QAPP Quality Assurance Project Plan QC Quality Control RE Radiological Engineer ROC Radionuclides of Concern

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 SOF Sum-of-Fraction TEDE Total Effective Dose Equivalent UBGR Upper Bound of the Gray Region UCL Upper Confidence Level USNRC United States Nuclear Regulatory Commission VCC Vertical Concrete Cask VSP Visual Sample Plan ZNPS Zion Nuclear Power Station ZSRP Zion Station Restoration Project

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

1. EXECUTIVE

SUMMARY

This Final Status Survey (FSS) Release Record for Survey Units #B1-01100AF and #B1-01110AF, Unit 1 Containment Basement, has been generated for the Zion Station Restoration Project (ZSRP) 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). This FSS package for the Unit 1 Containment Basement includes FSS design and FSS results for the following;

B1-01100AF Unit 1 Containment Above 565 ft.

B1-01110AF Unit 1 Containment Under Vessel Area Final Status Survey (FSS) sample plans for each of these survey units were 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, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)

(Reference 4).

In accordance with ZSRP LTP Chapter 5, section 5.5.2.1.2 and Table 5-19, the Unit 1 Containment basement survey units have a MARSSIM classification of 1. Survey plans were designed based upon use of the Sign Test as the nonparametric statistical test for compliance. Both the Type I () and Type II () decision error rates were set at 0.05. The Canberra In Situ Object Counting System (ISOCS) was selected as the primary instrument used to perform FSS of the Containment basement survey units. As Class 1 survey units, ISOCS measurement locations were designated to ensure 100% coverage of accessible structural surfaces within the survey units.

Based on a measurement Field-of-View (FOV) of 28 m2 for each ISOCS measurement, it was determined that one hundred and sixty eight (168) ISOCS shots were required to ensure 100% coverage of the Containment above 565 ft. (Survey Unit #B1-01100AF).

Twenty (20) ISOCS shots were identified to cover 100% of the Under Vessel Area (Survey Unit #B1-01110AF).

Modifications to the designed sample plan were required based on the location of measurement center-points. It was determined that some measurement locations were not feasible due to physical constraints and alternate measurement locations were added.

After making those adjustments to the sample plan, a total of one hundred and sixty four (164) ISOCS measurements were taken; sixty eight (68) on the lower wall above 565 ft.

and ninety six (96) on the floor (metal liner) and in the Cavity Flood Sump and the Recirculation Sump. In the Under Vessel area, additional measurements were required due to physical constraints caused by the limited space in the In-Core Tunnel Area. A 3-

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 meter stand-off distance between the detector and the surface undergoing survey was not possible in all cases. Consequently, a total of sixty (60) ISOCS measurements were required to ensure 100% areal coverage of the wall and floor surfaces in the Under Vessel and In-Core Tunnel Area.

The final Radionuclides-of-Concern (ROC) for the decommissioning of Zion are Co-60, Cs-134 and Cs-137 (as well as Eu-152 and Eu-154 for Containment), which are gamma emitters and Ni-63, Sr-90 and H-3 (applicable only to Containment), which are Hard-to-Detect (HTD) radionuclides. LTP section 5.1 states that HTD concentrations will be inferred using a surrogate approach and that the maximum ratios from LTP Chapter 5, Table 5-15 will be used unless area-specific ratios as determined by actual survey data are derived.

The results for all ISOCS measurements taken in both survey units, except for one (1) measurement taken on the 565 ft. elevation, indicate that the Sum-of-Fractions (SOF) for each measurement, considering the concentration of all applicable Radionuclides of Concern (ROC), either by direct measurement or by inference, is less than one (1) when applying the respective Operational Derived Concentration Guideline Levels (OpDCGL) for the Containment Basements, ZionSolutions TSD 17-004, Operational Derived Concentration Guideline Levels for FSS (Reference 5).

The one (1) ISOCS measurement on the 565 ft. elevation that exceeded the OpDCGLB was less than one (1) when compared to the Base Case DCGL (BcDCGLB) and both units passed the Sign Test. Therefore, the null hypothesis is rejected and the Unit 1 Containment Basement Survey Units #B1-01100AF and #B1-01110AF are acceptable for unrestricted release.

2. SURVEY UNIT DESCRIPTION The Unit 1 Containment Basement Survey Units #B1-01100AF and #B1-01110AF are impacted Class 1 basement FSS units. A basement FSS unit is comprised of the combined internal wall and floor surfaces of each remaining building basement below the 588 ft.

elevation following demolition. The FSS of the penetrations in the Unit 1 Containment Basement is documented in the Release Record for Survey Unit #B1-01112. The Containment Basement structure is located within Class 1 open land Survey Units #L1-12107, #L1-12108 and #L1-12109.

The basic decommissioning end-state for Unit 1 Containment building is the walls and floors below 588 ft. elevation. All concrete was removed from the interior side of the steel liner above the 565 ft. elevation, leaving only the remaining exposed liner below the 588 foot elevation, the concrete in the In-Core Instrument Shaft leading to and including the area under vessel (or Under-Vessel area), and the structural concrete outside of the

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 liner. The exposed metal liner was cleaned to levels below the OpDCGLs for basement structures (LTP Chapter 5, Table 5-4).

The large components inside each structure such as the Reactor Vessel, Pressurizer, Steam Generators, Reactor Coolant Pumps, primary piping and all associated systems were removed and properly disposed of as radioactive waste. The upper steel containment liner, the refuel cavity and all interior walls above the 588 foot elevation were also removed and disposed of as radioactive waste. The outer containment shells above the 588 foot elevation were surveyed and demolished. All waste material was properly packaged and sent offsite for disposal at approved disposal facilities for radioactive waste.

In accordance with the planned end state configuration, the concrete floor of the 568 ft.

elevation has been removed to expose the 1/2-inch steel liner. In this end state configuration, FSS unit #B1-01100AF consists of the interior side of the steel liner walls below the 588 ft. elevation and the 565 ft. elevation liner floor. The survey unit also contains Cavity Flood Sump and the Recirculation Sump. The bottoms of both sumps are located at the 559 ft. elevation.

Prior to remediation, the configuration of Survey Unit #B1-01110 included the concrete and embedded, 0.5-inch steel support rings interior to the steel liner below the 565 foot elevation of the Unit 1 Containment Building. The Under Vessel Area walls were 1 foot 11.5 inches thick, and the floor concrete was 2 foot 6 inches thick. The access tunnel had 1 foot 3 inch thick walls, floor, and roof. The embedded steel rings had supported equipment present in the Under-Vessel area.

The Zion Station Restoration Project (ZSRP) performed extensive remediation of the concrete located in the Under Vessel area below the 565 ft. elevation in Unit 1 Containment. Scabbling and hammering demolition techniques were used to remove at least six inches of concrete from the floor and walls located directly under the reactor vessel and at least six inches of concrete from the walls and slanted floor of the access tunnel. In some places, sufficient concrete was removed to expose the steel liner. Parts of the 0.5 steel support rings were also removed.

An embedded pipe (P125) is located between the 565 foot elevation and the Incore Tunnel Sump and will remain in the end state of the ZSRP. Data for that embedded pipe, including the dose to be added to the Unit 1 Containment Basement is documented in the Release Record for #S1-01111-AF.

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 1 - Containment Layout

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 2 - Unit 1 Containment 565 Elevation

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 3 - Unit 1 Containment Under Vessel

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 4 - Unit 1 Containment Incore Tunnel

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 5 - Unit 1 Containment Sloped Tunnel

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

3. CLASSIFICATION BASIS The Unit 1 Containment housed numerous systems containing primary coolant as well as radioactively contaminated support systems. System leakage and maintenance activities over the operating life of the reactor resulted in the radiological contamination of most of the interior surfaces of the structures. Some components, equipment, structural steel and concrete became radioactive due to neutron activation. Based on the building design basis and the operating history, all internal survey units in Unit 1 Containment Building were given an initial classification of Class 1 in accordance with the Zion Station Historical Site Assessment (HSA) (Reference 6).

Final Status Survey Unit #B1-01100AF encompasses the Unit 1 Containment above the 565 foot elevation. The Unit 1 Containment structure housed the Unit 1 Reactor Vessel, Steam Generators and Pressurizer. The HSA noted several occasions of radioactive liquid spill events during plant operation.

Final Status Survey Unit #B1-01110AF housed the Unit 1 In-Core flux monitoring tubes and associated supports. This survey unit is the concrete structure around and beneath the reactor void space (565 foot elevation and below) to remain at license termination. It provided personnel access to the area under the reactor vessel and housed the In-Core sump for collection and recovery of liquids released into the area.

The following summary of processes and incidents was obtained from the HSA:

07/24/1973: Had an RCS spill from the pressurizer sprays (ROR - No number).

09/12/1975: An estimated 1000-2000 gallons of RWST water sprayed through Unit 1 Containment (NRC IR 75-13/75-12).

10/7/1976: Noble gas levels up to 100 MPC (ROR 76-055).

October 1977: Containment liner coatings and concrete paint noted to be degrading (NRC IR 77-23/-).

11/2/1983: Note of high noble gas activity resulting in contamination of ~65 persons (NRC IR 83-21/83-22 and 83-27/83-28 and ROR 83-97).

January 1985 to March 1985: Component cooling leak (on 1CC-9428) in first quarter 1985 which led to a spill of ~10,000 gallons of CC water to the containment floor (NRC IR 85-12/85-13).

10/01/1989: Identified flooding of Unit 1 Containment though 4 open S/Gs (Zion RP/Decon Log).

02/19/1997: It was identified that Unit 1 Containment coatings (OMB) contained an alkyd primer covered by a carboline 305 product (PIF 97-0909).

August 1998: General exposure rates from 10-150 mR/hr and contamination up to

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 50,000 dpm/100cm2.

03/18/1976: Legal overexposure (8.05 rem) occurred in this area (NRC IR 76-12).

03/25/1982: Legal overexposure (3.880 rem) occurred in this area (NRC IR 82-09).

During the time that initial characterization was performed, all radioactive systems and components were still located inside Containment. Consequently, ambient radiation dose rates inside the Containment prohibited the direct assessment of concrete and steel structural surfaces below the 588 foot elevation by scanning or direct measurement.

On 03/12/2012, a characterization survey of the In-Core surfaces was conducted (Survey

2012-0810). All smears (10) collected in the area were greater than 1,000 dpm/100cm2; the highest loose surface contamination indication was 80,000 dpm/100cm2. The maximum dose rate recorded in the area was 25 mR/hr.

From June of 2012 through January of 2013, site characterization was performed in Unit 1 Containment. The characterization survey consisted of a series of concrete core samples taken in the 568 ft. concrete floor, the 541 ft. In-Core tunnel floor and In-Core tunnel walls. The locations selected for the concrete core sampling were biased toward locations where physical or observed radiological measurements indicated the presence of fixed and/or volumetric contamination of the concrete media. When possible, locations were determined based upon elevated observed contact dose rates or count rates. In addition, visual observations of floor and wall surfaces were used to identify potential locations of surface contamination, such as discoloration or standing water. The goal was to identify, to the extent possible, the locations that exhibited the highest potential of representing the worst case bounding radiological condition for concrete in each survey unit. This judgmental sampling approach also ensured there was sufficient source term in the cores to achieve the sensitivities required to determine the radionuclide distributions of gamma emitters as well as HTD radionuclides.

Sixteen (16) concrete core samples were taken on the 568 ft. elevation of the Unit 1 Containment, eight inside the missile shield and eight outside of the missile shield.

Three (3) concrete core samples were obtained from each of the In-Core tunnel Under Vessel areas. Two (2) concrete core samples were taken from the 541 ft. elevation floor and one was taken from the wall directly under each reactor vessel.

The results of the site characterization surveys performed from 2010 to 2013 are documented in ZionSolutions Technical Support Document (TSD)14-028, Radiological Characterization Report (Reference 7) and in Chapter 2 of the LTP. A summary of the on-site gamma spectroscopy results for the analysis of the concrete cores taken from the Unit 1 Containment 568 ft. elevation is presented in Table 1. A summary of the on-site gamma spectroscopy results for the analysis of the concrete cores taken from the Containment In-Core tunnel areas are presented in Table 2. A summary of the analysis of

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 select concrete cores for the full suite of radionuclides by an off-site laboratory is presented in Table 3. The locations where the core samples were taken are illustrated in Figures 6 and 7.

For the Unit 1 568 ft. elevation, the sample analysis indicated that the majority of the radionuclide source inventory resided within the first 1/2-inch of concrete and that Cs-137 was the dominant radionuclide. For the Unit 1 Under Vessel area, the maximum dose rate recorded was 26 mR/hr and the maximum loose surface contamination smear indicated 80,000 dpm/100cm2, which was taken at the In-Core Access Tunnel plate that supports the In-Core tubes (Survey #2012-0810). Sample B1-01110-CJF-CCV-001 showed the majority of activity above Minimum Detectable Concentration (MDC) for Co-60, Cs-137, and Eu-152 to a depth of 15.5 inches (entire core). The majority of Eu-154 source term was in the first 10 inches. Sample B1-01110-CJF-CCV-002 showed the majority of activity above MDC for Co-60, Eu-152, and Eu-154 was to a depth of 4 inches. The majority of Cs-137 source term was in the first 1/2 inch. Sample B1-01110-CJW-CCV-003 showed the majority of activity above MDC for Co-60, Cs-137, Eu-152, and Eu-154 was to a depth of 3.5 inches (entire core).

The top 1/2-inch puck from ten (10) of the 19 cores from Unit 1 were sent to Eberline Laboratory for gamma spectroscopy and HTD analyses for radionuclides such as H-3, C-14, Ni-63, Sr-90, and alpha emitters. Significant HTD radionuclides identified by the analysis of the concrete core samples included Ni-63, H-3 and Sr-90. The other radionuclides were less than their respective MDCs.

Based upon completion of the Survey Unit Classification Basis for final classification, which included a review of the historical information, the results of the Characterization Survey data and, completion of a final Survey Unit Classification Worksheet, the correct classification of Survey Units #B1-01100AF and #B1-01110AF was determined to be Class 1.

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 1 - Unit 1 Containment 568 Foot Elevation Concrete Core Sample Analysis Summary Co-60 Cs-137 Core Depth Surface Avg. Subsurface Surface Avg. Subsurface Location Sample ID#

(inches) Activity (a) Activity (b) Activity (a) Activity (b)

(pCi/g) (pCi/g) (pCi/g) (pCi/g)

A Loop I/S Missile Barrier B101102-CJFCCV-001 1.5 9.69E+01 1.40E+01 3.46E+04 4.76E+03 A Loop I/S Missile Barrier B101102-CJFCCV-002 5.0 1.91E+02 1.90E+01 4.04E+05 1.65E+04 B Loop I/S Missile Barrier B101103-CJFCCV-001 4.0 2.18E+02 2.55E+01 3.05E+05 3.10E+04 B Loop I/S Missile Barrier B101103-CJFCCV-002 4.5 7.97E+03 3.64E+02 9.86E+04 1.00E+04 C Loop I/S Missile Barrier B101104-CJFCCV-001 4.5 1.25E+02 1.69E+01 4.93E+05 6.71E+04 C Loop I/S Missile Barrier B101104-CJFCCV-002 4.0 4.63E+02 2.86E+01 4.40E+05 2.09E+04 D Loop I/S Missile Barrier B101105-CJFCCV-001 3.5 3.66E+04 6.54E+03 2.56E+03 2.09E+02 D Loop I/S Missile Barrier B101105-CJFCCV-002 5.0 1.04E+03 5.88E+01 3.07E+04 5.79E+03 A Loop O/S Missile Barrier B101106-CJFCCV-001 3.0 1.84E+01 1.20E+00 1.39E+03 6.42E+01 A Loop O/S Missile Barrier B101106-CJFCCV-002 1.0 2.66E+01 6.16E+00 8.03E+01 1.23E+01 B Loop O/S Missile Barrier B101107-CJFCCV-001 1.0 2.04E+01 3.36E+00 3.68E+02 5.21E+01 B Loop O/S Missile Barrier B101107-CJFCCV-002 1.0 1.92E+01 3.56E+00 2.41E+02 3.40E+01 C Loop O/S Missile Barrier B101108-CJFCCV-001 2.5 1.50E+01 2.10E+00 8.70E+03 4.71E+02 C Loop O/S Missile Barrier B101108-CJFCCV-002 1.5 6.16E+01 1.16E+01 6.08E+04 8.50E+03 D Loop O/S Missile Barrier B101109-CJFCCV-001 1.0 1.02E+01 1.93E+00 1.94E+02 3.21E+01 D Loop O/S Missile Barrier B101109-CJFCCV-002 1.0 1.18E+02 1.84E+01 7.32E+03 9.08E+02 (a) Represents surface activity of floor following removal of loose contamination (b) Represents average of activity over entire depth of core sample minus the surface activity

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 2 - Unit 1 Containment 541 Foot Elevation Concrete Core Sample Analysis Summary Co-60 Cs-137 Eu-152 Eu-154 Core Surface Avg. Sub- Surface Avg. Sub- Surface Avg. Sub- Surface Avg. Sub-Location Sample ID# Depth Activity surface Activity surface Activity surface Activity surface (a)

(inches) Activity (b) (a)

Activity (b) (a)

Activity (b)

(pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g)

Incore Tunnel Floor B101110-CJFCCV-001 15.5 2.79E+01 5.97E+00 5.27E+01 4.07E+00 6.97E+01 3.34E+01 5.23E+00 1.86E+00 Incore Tunnel Floor B101110-CJFCCV-002 4.0 3.48E+02 5.91E+01 2.71E+03 3.28E+02 6.30E+01 9.15E+01 4.35E+00 5.72E+00 Incore Tunnel Wall B101110-CJWCCV-003 3.5 1.12E+01 7.64E+00 3.72E+01 2.61E+00 5.60E+01 6.67E+01 4.19E+00 3.73E+00 (a) Represents surface activity of floor following removal of loose contamination (b) Represents average of activity over entire depth of core sample minus the surface activity

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 3 - Unit 1 Containment Concrete Core Samples - Eberline Laboratory Analysis B101102- B101103- B101104- B101105- B101105- B101106- B101107- B101108- B101109- B101110- B101110-CJFCCV- CJFCCV- CJFCCV- CJFCCV- CJFCCV- CJFCCV- CJFCCV- CJFCCV- CJFCCV- CJFCCV- CJFCCV-Radionuclide 002 002 001 001 002 002 002 002 001 001 002 (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g)

H-3 1.91E+01 2.60E+01 3.75E+01 2.71E+01 1.19E+02 8.11E+01 5.05E+01 7.61E+01 5.40E+01 1.33E+02 2.20E+02 C-14 2.50E+00 3.62E+00 4.40E+00 2.46E+01 2.71E+00 1.51E+00 1.12E+00 9.52E+00 1.09E+00 9.89E-01 3.30E+00 Co-60 8.12E+01 7.09E+03 8.69E+01 3.35E+04 9.77E+02 4.36E+01 1.50E+01 8.67E+01 8.50E+00 4.45E+01 3.60E+02 Ni-63 1.81E+04 2.26E+03 6.29E+03 2.81E+03 1.14E+01 3.02E+01 5.48E+00 2.39E+01 1.13E+01 1.40E+02 2.98E+01 Sr-90 4.75E+01 7.60E+00 1.63E+02 1.45E+01 7.08E+00 3.97E-01 5.67E-01 8.46E+00 4.74E-01 3.16E-01 6.01E-01 Nb-94 8.56E+01 1.56E+01 5.13E+01 2.56E+01 7.85E+00 6.01E-01 3.03E-01 9.30E+00 2.37E-01 1.47E+00 1.97E+00 Tc-99 2.25E+01 1.22E+00 3.46E+01 9.31E-01 9.35E-01 2.96E-01 2.60E-01 1.13E+00 2.66E-01 2.63E-01 1.33E+00 Ag-108m 2.39E+02 1.72E+01 5.72E+01 2.05E+01 9.25E+00 4.50E-01 2.35E-01 1.19E+01 2.09E-01 1.45E+00 1.91E+00 Sb-125 1.92E+02 5.54E+01 1.23E+02 3.88E+01 4.78E+01 1.86E+00 1.65E+00 5.62E+01 2.96E-02 NA NA Cs-134 5.47E+01 1.61E+01 3.68E+01 1.53E+01 9.47E+00 4.45E-01 3.31E-01 3.92E+01 3.54E-01 6.39E-01 1.61E+00 Cs-137 1.45E+05 9.44E+04 1.22E+05 2.72E+03 4.27E+04 1.38E+02 1.60E+02 5.91E+04 1.43E+02 8.83E+01 2.84E+03 Pm-145 1.49E+04 1.38E+04 3.49E+03 2.75E+02 5.26E+03 1.42E+01 1.74E+00 8.49E+03 2.02E+00 1.63E+01 3.94E+02 Eu-152 4.52E+02 7.31E+01 2.52E+02 1.25E+02 2.29E+01 1.82E+00 8.56E-01 1.95E+01 1.06E+00 1.64E+02 1.08E+02 Eu-154 2.26E+02 3.58E+01 1.29E+02 5.16E+01 1.48E+01 9.41E-01 5.26E-01 1.76E+01 5.44E-01 1.29E+01 8.69E+00 Eu-155 5.39E+01 2.37E+01 3.54E+01 1.70E+01 1.68E+01 6.24E-01 6.11E-01 1.89E+01 6.41E-01 3.69E+00 3.52E+00 Np-237 9.15E-02 9.56E-02 7.24E-02 9.82E-02 7.93E-02 2.40E-02 3.62E-02 1.01E-01 2.56E-02 NA NA Pu-238 1.25E-01 2.35E-01 3.05E-01 3.18E+00 1.31E-01 5.39E-02 1.03E-01 1.65E-01 9.33E-02 5.21E-02 1.22E-01 Pu-239/240 9.84E-02 1.11E-01 1.12E-01 2.30E+00 7.62E-02 5.24E-02 1.64E-01 1.05E-01 5.88E-02 4.50E-02 1.09E-01 Pu-241 8.17E+00 7.08E+00 8.54E+00 1.24E+01 7.86E+00 5.60E-01 4.53E-01 9.36E+00 4.79E-01 4.21E-01 7.28E+00 Am-241 3.58E-01 1.39E+00 4.25E-01 5.15E+01 2.68E-01 1.67E-01 8.80E-02 1.01E-01 5.40E-02 4.36E-02 2.15E-01 Am-243 8.37E-02 1.36E-01 6.05E-03 5.33E-01 8.36E-02 3.80E-02 4.49E-02 7.63E-02 2.96E-02 3.04E-02 9.33E-02 Cm-243/244 8.70E-02 3.34E-01 1.27E-01 1.01E+01 1.43E-01 4.35E-02 4.04E-02 7.26E-02 6.46E-02 6.35E-02 1.56E-01 a Bold values indicate concentration greater than MDC. Italicized values indicate MDC value. NA indicates no analysis

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 6 - Unit 1 Containment 568 foot el. Concrete Core Sample Locations

[22]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 7 - Unit 1 Containment 541 foot el. Concrete Core Sample Locations

[23]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 On 11/3/16, the last routine surveys were conducted in Unit 1 Containment, before heavy demolition started and access was no longer possible. Survey 2016-2053, conducted in the Outer Missile Barrier (OMB) area of Unit 1, showed that the maximum dose rate was 1.0 mR/hr, and in survey 2016-1988 all smears were less than 20,000 dpm/100cm2 with a maximum dose rate of 5 mR/hr. Survey 2016-3470, conducted in the Inner Missile Barrier (IMB) area of Unit 1, showed a maximum loose contamination level of 8,000 dpm/100cm2 and a maximum dose rate of 1.7 mR/hr.

Following demolition and prior to attempting FSS, LTP section 5.3.4.4 required that continuing characterization be performed of the concrete walls and floor of the Under-Vessel area in Unit 1 Containment and to assess the radiological condition of the exposed steel liner above the 565 ft. elevation after the contaminated concrete has been removed.

The continuing characterization of the steel liner above the 565 ft. elevation consisted of sufficient smear samples and beta scans of accessible surfaces to ensure that the liner was adequately decontaminated prior to FSS. This survey was performed in November 2017.

The result of smear samples indicated no detectable loose surface contamination greater than 1,000 dpm/100cm2 on exposed building surfaces above the 565 ft. elevation.

Continuing characterization was performed in the Under Vessel are between November 11, 2017 and December, 2017. The objective of the continuing characterization survey was to assess the depth of activation in the concrete in order to guide the remediation necessary to meet OpDCGL for Containment and, to ensure the correct geometry was used for the ISOCS measurements. The survey consisted of scanning the exposed concrete surfaces and the acquisition of sixteen (16) concrete core samples with three (3) of those samples taken on the upper wall, five collected from the mid-wall, four (4) samples taken on the lower wall and three (4) samples taken on the floor. In addition, three (3) samples were taken from the metal in the embedded steel support ring. See Figure 8 for a graphic depiction of the sample locations.

To the extent possible, the locations selected for concrete core samples were identified by the scan measurement on the surface that exhibited the highest activity. The concrete core samples were taken through the layer of concrete from the exposed grade to the underlying steel liner if possible. Each core was segmented into 1/2-inch pucks, which were then analyzed by the on-site gamma spectroscopy system for gamma-emitting radionuclides. The results of the analysis of continuing characterization concrete core samples are presented in Table 4.

In November 2017, the three concrete pucks that contained the highest gamma-emitting radionuclide activity were sent to Eberline Laboratories to be analyzed for the full suite of radionuclides from Table 5-1 from LTP Section 5.1. The results of the analyses are

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 presented in Table 5. The ratios for H-3, Ni-63 and Sr-90, based on the three continuing characterization samples that were analyzed for HTDs are presented in Table 6.

Figure 8 - Unit 1 Containment Continuing Characterization Concrete Core Sample Location

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJWC-001CV B101110-CJWC-002CV B101110-CJWC-003CV B101110-CJWC-004CV Depth pCi/g pCi/g pCi/g pCi/g pCi/g pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 0 13.2 0.045 679 30.4 2.89 81.5 0.155 49200 33.1 13.800 6.86 0.181 44.1 62.7 3.57 40.5 3.41 6090 11.2 17.1 0.5 9.90 0 398 30.4 2.62 68.1 0.441 40000 32.6 54.500 6.68 0.819 29.0 62.8 4.73 32.0 0 4830 11.0 22.1 0.5 4.45 0 3.17 41.5 2.56 11.5 1.33 2890 149 8.550 5.78 0 0 67.8 5.05 3.24 0.065 3.64 44.0 2.74 1 4.00 0 2.61 41.9 3.11 12.4 0.783 1930 152 14.000 5.89 0 0 67.0 4.46 3.11 0 2.34 43.6 2.99 1 4.55 0.372 0.344 42.4 2.57 3.00 0.027 3.53 40.7 2.50 5.65 0 0 63.8 3.30 3.00 0.471 6.36 46.2 2.77 1.5 4.51 0 0 42.9 2.85 3.08 0.143 2.66 40.5 2.39 5.41 0 0 64.6 3.65 3.02 0 5.97 45.7 1.37 1.5 2.57 0.026 0.488 35.4 2.14 2.90 0.152 0.498 38.9 2.46 5.43 0.164 0.264 58.4 3.29 2.88 0.206 1.65 48.8 2.31 2 2.65 0.001 0.255 34.3 1.76 2.81 0.489 0.779 38.9 2.48 5.30 0.499 0.375 55.5 2.90 2.89 0.323 0.959 47.5 1.94 2 2.74 0.060 0 35.4 2.47 7.26 0.029 0.418 6.03 0.373 8.94 0 0.345 67.2 2.00 2.57 0.201 0.640 42.2 2.32 2.5 2.73 0.183 0 37.1 1.36 8.84 0.075 0.357 64.1 3.34 2.57 0.066 0.676 42.0 2.13 2.5 2.82 0.097 0.115 34.7 1.49 4.37 0.715 0 55.2 2.90 2.28 0.485 0.835 41.9 2.41 3 3.15 0.0 0.229 38.4 1.76 4.65 0.057 0 57.0 3.12 2.40 0 1.01 41.8 2.31 3 2.80 0.178 0.247 39.6 2.38 5.42 0 0 53.9 2.39 3.86 0 0.586 37.2 2.11 3.5 2.61 0.564 0.282 39.9 1.92 4.65 0.165 0 49.8 37.1 3.71 0 0.555 37.5 2.35 3.5 2.97 0.076 0.413 30.3 1.74 2.92 0.055 0.236 40.5 1.65 2.36 0.201 1.67 33.6 1.64 4 2.92 0.024 0.170 29.4 1.60 6.99 0.122 0.839 8.19 0.530 2.94 0.398 0.606 38.8 2.11 2.20 0.174 2.65 31.7 1.38 4 2.33 0.080 0 20.1 1.08 2.12 0.158 0.480 25.4 1.07 2.68 0.148 0.280 38.8 2.25 3.14 0.123 2.08 28.8 1.34 4.5 2.16 0.213 0.974 26.2 0.768 2.58 0.099 0.219 36.6 1.87 3.16 0.115 1.41 30.2 2.88 4.5 2.06 0.443 0.447 25.9 1.28 2.73 0.290 0.085 34.7 1.59 1.70 0 0.138 25.8 1.25 5 1.95 0 0.154 19.2 1.14 2.01 0 0.242 26.0 1.23 2.58 0 0.374 35.9 2.23 1.67 0.143 0 25.8 0.524 5 3.31 0.067 0 5.44 0.437 1.61 0.047 0.056 27.1 1.48 2.97 0.279 0.164 35.4 1.30 1.25 0.032 0.182 20.2 0.802 5.5 1.63 0 0.207 26.3 1.53 3.32 0 0 35.9 1.66 1.13 0 0 17.8 0.924 5.5 1.71 0.134 0.367 24.5 0.916 3.25 0.296 0.091 30.8 1.38 1.24 0 0.316 17.9 0.960 6 1.63 0 0.261 23.2 1.04 2.97 0 0.327 30.1 1.51 1.35 0.118 0.045 17.4 1.12 6 2.95 0.298 0.090 23.4 1.10 2.41 0.101 0.137 25.1 0.919 1.16 0.176 0 16.1 0.108 6.5 4.23 0.084 0.151 3.08 0.216 3.38 0 0.599 24.5 0.881 2.10 0 0 24.2 1.01 1.00 0.149 0 16.4 0.178 6.5 0.813 0 0.099 13.5 0.477 1.58 0.121 0.589 21.1 1.12 1.90 0 0 23.4 1.22 0.950 0 0.075 13.7 0.771 7 1.15 0.238 0.008 14.1 1.40 1.39 0.238 0.147 19.9 0.763 1.53 0 0.291 22.7 1.47 0.973 0 0 12.5 0.846 7 1.65 0.167 0 14.6 0.746 0.947 0.016 0.231 15.3 0.906 1.42 0.266 0 19.1 0.639 0.756 0 0.233 9.97 7.27 7.5 1.52 0.108 0.042 15.5 0.797 0.977 0.034 0.334 0.158 0.859 1.43 0.169 0 15.0 0.636 0.686 0 0 10.3 0.870 7.5 0.797 0.128 0.349 10.6 0.897 1.21 0.056 0.261 14.1 0.511 1.03 0 0.207 13.1 0.715 0.634 0.080 0.272 10.1 0.634 8 0.857 0.052 0 11.5 0.373 1.12 0 0.231 14.4 0.984 0.975 0.003 0.265 15.3 0.732 0.631 0.127 0.054 9.58 0.118 8 0.686 0 0.123 10.6 0.460 1.08 0.251 0.233 12.9 0.898 1.39 0.001 0.060 16.5 0.494 0.552 0.016 0.109 9.35 6.96 8.5 0.760 0.084 0 11.1 0.302 0.862 0.094 0.105 13.1 0.576 1.35 0.188 0.081 16.5 0.542 0.557 0 0.092 9.20 0.511 8.5 0.739 0 0.353 10.7 8.390 0.770 0 0.252 11.7 0.301 0.648 0.071 0.446 11.9 8.37 0.425 0 0.122 9.15 0.488 9 0.808 0.384 0 10.0 0.823 0.902 0 0.196 11.2 0.796 0.652 0 0 11.5 0.068 0.426 0.090 0 9.18 1.31 9 0.783 0.033 0.254 8.70 0.953 0.593 0 0.417 9.02 0.378 0.723 0 0.228 10.7 0.405 0.278 0.176 0.014 5.67 4.36 9.5 0.905 0.030 0 8.23 0.428 0.595 0.020 0.258 8.42 0.656 0.689 0 0.103 10.6 7.96 0.271 0.082 0 6.00 4.49

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJWC-001CV B101110-CJWC-002CV B101110-CJWC-003CV B101110-CJWC-004CV Depth pCi/g pCi/g pCi/g pCi/g pCi/g pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 9.5 1.06 0.002 0.208 8.98 0.759 0.510 0.123 0.242 7.76 0.174 0.844 0.043 0.099 9.77 6.82 0.632 0.109 0.206 5.68 0.499 10 1.25 0.067 0 8.52 0.399 0.639 0.055 0.316 7.92 0.114 0.761 0.033 0.094 9.66 0.405 0.475 0.016 0.309 4.82 0.325 10 0.555 0.247 0.232 5.70 0.021 0.804 0.094 0 7.13 0.152 0.596 0.048 0.086 6.03 0.097 0.004 0.142 0.510 0.235 0.232 10.5 0.562 0.033 0 6.09 0 0.734 0 0.180 7.33 0.756 0.535 0 0.180 6.42 0.052 0.074 0.104 0.283 0.896 0.374 10.5 0.154 0 0 2.58 1.96 0.782 0 0.194 6.40 4.54 0.698 0.058 0.019 7.59 0.471 0.012 0 0.135 0.282 0.088 11 0.157 0.064 0 2.99 0.210 0.772 0.270 0.140 7.13 0.179 0.389 0 0 6.92 4.55 0.099 0 0.017 0.107 0.005 11 0.209 0.019 0.051 3.38 2.26 0.381 0.025 0.079 4.61 0.512 0.629 0.029 0.084 6.25 0.602 0.055 0.057 0.097 0.241 0.123 11.5 0.174 0.0 0.033 3.38 2.54 0.352 0 0.105 4.69 3.13 0.467 0 0.111 5.84 0.054 0.068 0.069 0.142 0.670 0.113 11.5 0.414 0.161 0.151 4.52 0.093 0.412 0 0 4.31 0.098 0.293 0 0.218 3.96 1.14 0.159 0.023 0.081 0.163 0 12 0.284 0.158 0.180 4.33 0.202 0.419 0.000 0.183 4.29 0.441 0.298 0 0.062 4.13 0.026 0.073 0.024 0.041 0.266 0.253 12 0.292 0.034 0 4.13 3.33 0.200 0.058 0.084 3.11 0.084 0.364 0.013 0 3.66 0.023 0 2.89 2.03 0.393 4.97 12.5 0.324 0.044 0.091 4.48 3.43 0.160 0 0.075 2.88 0.074 0.418 0 0.109 3.93 0.459 0.151 0 0.154 0.486 0 12.5 0.374 0.126 0.230 4.62 0 0.497 0.009 0.613 2.54 0.406 0.306 0.175 0.220 3.77 0 0.167 0.224 0.134 0.020 0.064 13 0.380 0.089 0.243 4.99 3.43 0.259 0 0.659 2.85 2.38 0.278 0 0 3.35 2.50 0.075 0 0.103 0.206 0.100 13 0.346 0.174 0.077 5.40 0.027 0.295 0.070 0.130 2.09 1.43 0.261 0 0.172 2.22 0.678 0.007 0.219 0.112 0.198 0.093 13.5 0.379 0.042 0.109 5.59 0.152 0.323 0 0.204 2.11 1.51 0.210 0.207 0 2.32 1.76 0.110 0 0.119 0.145 0.018 13.5 0.254 0.048 0.210 2.07 1.45 0.142 0.064 0.079 1.48 1.21 0.222 0.048 0.034 1.55 1.13 0.211 0 0.117 0.371 0.260 14 0.192 0.061 0 2.08 0 0.157 0 0.050 1.71 0.507 0.139 0.047 0 1.52 0.033 0.145 0.077 0.059 0.129 0.123 14 0.220 0.010 0.181 1.65 0.073 0.150 0.127 0.278 1.54 0.195 0.217 0 0 1.05 0.212 0.155 0.047 0.026 0.076 0.284 14.5 0.260 0 0.050 1.53 0.128 0.218 0.284 0.281 1.26 0.040 0.255 0.156 0.172 1.41 0.477 0.105 0 0 0.468 0.545 14.5 0.241 0 0.068 1.71 0.352 0.044 0.065 0.082 1.50 0.185 0.135 0.034 0.055 1.25 0.721 0.029 0.131 0.168 0.242 0.241 15 0.171 0.012 0.046 1.55 0.129 0.114 0 0.149 1.46 0.163 0.179 0 0 1.25 0.809 0.118 0.098 0.059 0.306 0.163 15 0.214 0.088 0.191 1.57 0.441 0.088 0 0.316 1.35 0.327 0.128 0.143 0.121 0.720 0.525 0.099 0.039 0.096 0.258 0.380 15.5 0.113 0.022 0.048 1.25 0.872 0.265 0 2.37 1.10 0.764 0.065 0.059 0.141 0.822 0.564 0.051 0 0.115 0.372 0.055 15.5 0.152 0 0.161 1.12 0.680 0.199 0 0.133 0.884 0.655 0.288 0.054 0.197 0.606 0.604 0.107 0 0.193 0.276 0.139 16 0.246 0.055 0.236 1.18 0.311 0.121 0.066 0.074 0.693 0.554 0.182 0.072 0.170 0.769 0.369 0.052 0.045 0.143 0.331 0.189 16 0.165 0 0.033 1.21 0.106 0.167 0.091 0.204 0.671 0.363 0.093 0 0.160 0.623 0.296 0.168 0.011 0.094 0.516 0.369 16.5 0.242 0.158 0.303 0.615 0.465 0.158 0.081 0.191 0.747 0.482 0.249 0 0.051 0.494 0.037 0 0.054 0.208 0.493 0.391 16.5 0.185 0.014 0.229 0.792 0.630 0.144 0.043 0.181 1.13 0.634 0 0.116 0.122 0.340 0.548 0.093 0.074 0.159 0.550 0.453 17 0.122 0 0.118 0.664 0.458 0.093 0 0.124 0.689 0.253 0.170 0.029 0.210 0.540 0.169 0.067 0 0 0.501 0.365 17 0.172 0.018 0 0.596 0.441 0.075 0 0.673 0.779 0.132 0.093 0 0.147 0.290 0.392 0.249 0.114 0.020 0.577 0.421 17.5 0.146 0.035 0.090 0.333 0 0.092 0.078 0.112 0.469 0.433 0.140 0.184 0.029 0.321 0.263 0.080 0.045 0.088 0.636 0 17.5 0.241 0.032 0.175 0.911 0.419 0.103 0 0.124 0.354 0.266 0.035 0 0.061 0.287 0.067 0.050 0.047 0.194 0.872 0 18 0.043 0.008 0.095 0.806 0.010 0.120 0.011 0.063 0.329 0.207 0.068 0.014 0.096 0.257 0.228 0.219 0 0.046 0.968 0.805 18 0 0 0.074 0.637 0.235 0.126 0.036 0.163 0.321 0.136 0.011 0.144 0.160 0.124 0.079 0.218 0.184 0.152 1.34 0.050 18.5 0.145 0 0.143 0.299 0.345 0.077 0.066 0.182 0.024 0.140 0.088 0 0.216 0.066 0.101 0.212 0.001 0 1.12 1.03 18.5 0.051 0 0.304 0.234 0.040 0.111 0.202 0.005 0.926 0 0 0 0.117 0.386 0.612 0.095 0.166 0 0.887 0.700

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJWC-001CV B101110-CJWC-002CV B101110-CJWC-003CV B101110-CJWC-004CV Depth pCi/g pCi/g pCi/g pCi/g pCi/g pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 19 0.012 0.042 0.660 0.177 0.172 0.085 0.110 0.049 0.594 0.003 0.083 0.065 0.127 0.875 0.676 0.225 0.124 0.182 1.32 0.061 19 0.141 0.030 0.082 0.170 0.282 0.211 0.056 0.173 1.27 1.18 19.5 0.126 0.013 0 0.298 0.184 0.266 0.077 0.101 1.30 0.977 19.5 0.080 0 0.151 0.305 0.073 0.208 0.255 0.015 2.07 0.103 20 0.042 0.015 0.295 0.145 0.004 0.229 0.068 0.026 1.87 0.210 20 0.283 0.021 0.099 2.01 1.56 20.5 0.244 0 0.159 2.03 1.75 20.5 0.177 0.110 0.072 2.63 1.97 21 0.264 0 0.159 2.53 0.112 21 0.297 0 0.271 3.05 0.083 21.5 0.259 0.093 0.046 3.03 0.542 21.5 0.203 0.102 0 4.25 0.289 22 0.260 0.062 0.294 4.14 0 22 0.294 0 1.26 3.99 0.270 22.5 0.331 0 0.129 4.20 3.09

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJFC-005CV B101110-CJFC-006CV B101110-CJWC-007CV B101110-CJFC-008CV Depth pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 0 77.7 2.62 10400 8.25 13.2 33.5 0.554 1140 54.2 3.01 89.3 0 5460 22.5 1.81 98.6 1.11 3210 67.9 5.39 0.5 57.7 4.28 7040 6.23 5.20 20.0 0 975 51.2 2.89 117 0 9070 21.2 3.29 85.4 1.80 2200 71.9 6.94 0.5 3.51 0.218 4.73 34.8 2.35 16.3 0.852 328 64.0 3.86 27.7 0 321 35.2 2.98 21.3 1.93 207 81.3 5.53 1 3.63 0 3.65 32.7 2.43 15.4 0.897 338 58.4 4.31 27.2 0.812 266 34.8 2.99 20.6 0.810 198 85.5 5.87 1 4.22 0.184 6.43 48.0 3.00 12.6 0.272 204 49.7 3.24 12.0 0.402 18.8 37.8 1.77 15.0 0 65.2 98.0 4.29 1.5 4.01 0 5.00 48.6 2.74 13.3 0.570 245 50.0 3.30 9.05 0.051 15.5 38.1 1.38 15.0 0.517 81.8 97.5 4.63 1.5 4.25 0 2.86 48.1 2.97 8.28 0.287 61.6 48.1 3.13 3.00 0.572 0 44.0 1.83 15.8 0.508 107 97.9 6.07 2 4.17 0.217 2.81 45.8 1.56 7.23 0 49.3 45.4 2.94 3.42 0 0 46.6 2.88 14.4 0 90.0 80.4 4.95 2 3.53 0.066 2.02 47.1 1.11 18.7 0 2.95 8.92 0.428 3.11 0.045 0.355 41.7 2.14 17.3 0.187 90.8 67.8 2.91 2.5 3.68 0.183 1.22 50.6 2.39 3.10 0 0.478 41.9 3.06 18.3 0.196 87.1 71.2 3.77 2.5 4.82 0 1.69 54.8 2.88 6.01 0 0 20.3 1.04 16.7 0.354 36.0 90.3 4.62 3 4.55 0.234 1.18 52.1 2.94 18.8 0.009 2.70 11.5 0.637 5.76 0 0.233 20.5 1.12 17.2 0.958 38.5 86.5 4.71 3 4.02 0.503 0.833 50.8 2.65 6.54 0 3.97 49.2 2.25 12.4 0.272 32.3 80.6 61.9 3.5 3.80 0.201 1.28 51.3 2.43 7.25 0.185 4.18 49.1 2.83 11.6 0.197 31.1 78.9 3.92 3.5 3.27 0.278 0.828 50.0 2.82 7.28 0.274 4.19 43.8 2.38 2.59 0 0 50.6 2.72 9.74 0.075 32.6 62.6 3.20 4 2.96 0 0.817 49.1 2.31 7.14 0.253 4.60 46.0 2.38 2.80 0.553 0.047 51.2 1.80 9.96 0.573 31.4 61.4 3.15 4 2.72 0 3.14 44.6 2.29 3.95 0 4.33 33.7 1.69 3.25 0.012 0.213 38.4 1.55 7.05 0 21.4 66.9 3.17 4.5 2.70 0 2.41 42.4 32.0 3.99 0.071 5.12 35.5 1.97 3.14 0 0.224 39.3 1.40 6.92 0 18.3 64.1 2.72 4.5 2.85 0.102 0.538 36.9 1.51 4.38 0 2.43 43.1 1.84 2.83 0.282 0 33.1 1.76 6.93 0.429 14.0 63.5 2.86 5 2.83 0 0.600 36.0 2.01 4.42 0.289 1.81 44.1 33.7 2.51 0 0 30.5 23.9 6.89 0.249 12.8 62.5 2.43 5 2.12 0.068 0.299 35.8 2.08 2.57 0.064 1.12 33.4 1.75 2.22 0.195 0.405 36.2 1.59 3.85 0 7.72 52.8 2.42 5.5 2.40 0.051 0.462 34.7 1.66 2.53 0.403 0.87 31.7 1.25 2.17 0.327 0 34.1 1.96 3.68 0 4.81 53.5 2.53 5.5 4.31 0.642 0.184 37.7 1.67 2.12 0.374 0.451 30.0 1.58 1.47 0.256 0.127 27.7 1.46 3.92 0 0.203 51.2 2.36 6 4.25 0.103 0.671 37.1 1.92 2.09 0.320 0.320 29.1 1.33 1.79 0 0 25.8 0.829 4.12 0.027 0.262 50.3 2.33 6 2.23 0.442 0.437 29.4 1.37 2.07 0 0.684 25.8 1.64 1.52 0 0.325 25.5 2.12 4.58 0 0.351 50.1 2.14 6.5 1.96 0.244 0.054 28.7 1.03 2.11 0.057 0.857 24.0 1.38 1.74 0.090 0 24.2 0 5.00 0 0.011 48.9 2.50 6.5 2.42 0 0.396 25.6 1.56 2.03 0 0 22.3 1.88 1.50 0 0 22.7 1.34 4.08 0.460 0.340 41.5 1.60 7 2.62 0 0.506 24.5 1.13 1.72 0.186 0.101 22.4 1.42 1.45 0 0.160 20.5 1.13 2.75 0 0.266 31.4 1.27 7 1.20 0 1.56 18.5 13.7 1.52 0 0.238 20.4 0.788 1.37 0.254 0.136 17.5 0.980 2.35 0 0.148 35.6 1.88 7.5 1.12 0.327 1.64 17.2 0.685 1.69 0.359 0 21.8 0.745 1.39 0 0 17.5 1.17 2.45 0.186 0.032 35.7 1.70 7.5 1.45 0 0.35 13.4 0.641 1.10 0.024 0.181 17.1 0.847 1.45 0.384 0 17.8 0.830 1.93 0.140 0.086 28.2 1.67 8 1.16 0 0.466 16.5 0.910 1.18 0.166 0 18.0 0.596 1.44 0 0 16.9 1.48 1.96 0.120 0 28.0 1.48 8 1.15 0.096 0.541 17.2 13.9 1.22 0.087 0.156 17.0 0.921 0.99 0.089 1.17 14.1 10.8 1.62 0.096 0 23.4 0.897 8.5 1.09 0.293 0.485 18.2 1.24 1.26 0 0.024 18.3 1.11 0.744 0.057 1.51 10.6 0.440 1.58 0.014 0.039 24.3 0.994 8.5 1.28 0 0.541 12.8 2.01 1.31 0.087 0 14.5 0.660 0.559 0.005 0.181 6.42 0.261 1.30 0.206 0.039 22.1 1.46 9 1.07 0.295 0.267 13.0 0.419 1.23 0.086 0.302 13.7 0.289 0.672 0.052 0 7.93 0.096 1.55 0 0.083 22.3 0.715 9 0.541 0.012 0.757 9.93 7.50 0.861 0.143 0 12.0 0.628 0.667 0.063 0 8.36 0.588 1.69 0.020 0 17.9 1.09 9.5 0.625 0.006 0.331 9.03 0.517 0.849 0.065 0 11.5 0.207 0.607 0 0.204 8.02 5.91 1.39 0.050 0 16.1 1.05

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJFC-005CV B101110-CJFC-006CV B101110-CJWC-007CV B101110-CJFC-008CV Depth pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 9.5 0.656 0.021 0.361 8.92 6.40 0.552 0.063 0.142 9.57 0.963 0.513 0.102 0.143 6.62 0.296 0.776 0 0.140 12.1 0.552 10 0.599 0.240 0.357 8.98 0.362 0.630 0.164 0.223 9.63 0.342 0.628 0.184 0 6.22 0.083 0.770 0.174 0.100 12.6 0.950 10 0.451 0.236 0.085 6.79 0.572 0.504 0 0.225 8.06 0.091 0.459 0.026 0 5.30 0.148 1.00 0.132 0.141 13.3 0.598 10.5 0.341 0.235 0.192 7.19 1.02 0.618 0 0.131 7.63 0.340 0.541 0.123 0.015 5.44 0.415 1.10 0.164 0.208 12.2 1.01 10.5 0.516 0.063 0.321 6.24 0.277 0.486 0.054 0 7.83 1.67 0.425 0.045 0.044 5.76 0.330 0.910 0.144 0 11.8 0.577 11 0.434 0.150 0.268 5.77 0.603 0.726 0 0 7.37 1.78 0.320 0 0.077 5.95 0.647 0.687 0.116 0 11.2 0.577 11 0.363 0.095 0.113 4.36 0.124 0.398 0 0 5.75 0.343 0.418 0.069 0.231 3.87 3.02 0.903 0.087 0 10.1 0.565 11.5 0.393 0.015 0.213 4.00 0.117 0.534 0.056 0 5.60 0.424 0.393 0 0.054 4.06 0.189 0.673 0.327 0.118 10.6 8.03 11.5 0.427 0 0.352 3.44 3.02 0.377 0.048 0.270 4.22 3.09 0.454 0.032 0 4.62 0.446 0.541 0 0.072 7.82 0.867 12 0.285 0 0.184 3.57 2.73 0.296 0.153 0.148 3.39 2.80 0.317 0.134 0.040 4.45 0.308 0.606 0.116 0.033 7.90 0.421 12 0.303 0 0.038 3.53 0.081 0.582 0 0.610 4.33 0 0 0.036 0.074 2.85 0.543 0.382 0 0.018 6.30 4.43 12.5 0.235 0.019 0.152 3.28 0 0.489 0 0.380 4.28 0.349 0.209 0.093 0.204 2.61 2.040 0.561 0.081 0 6.19 0.466 12.5 0.402 0.079 0.122 2.87 0.202 0.439 0 0.079 3.34 0.401 0.031 0 0.004 0.481 0.318 0.839 0.120 0.215 5.24 0.352 13 0.202 0.088 0.176 2.85 0.104 0.380 0.165 0.191 3.43 2.05 0.030 0.173 0 0.251 0.293 0.471 0.097 0.202 4.67 0.232 13 0.331 0 0.175 2.80 0 0.322 0 0.122 2.95 0.093 0.168 0.046 0.183 0.454 0.219 0.291 0.005 0.135 3.25 0.911 13.5 0.328 0 0.097 2.96 0.699 0.292 0.030 0.237 3.35 0.102 0.082 0.417 0.165 0.254 0.267 0.221 0 0.159 2.68 0.150 13.5 0.317 0.014 0.269 2.35 0.041 0.154 0 0.142 2.65 1.94 0.091 0.015 0 0.394 0.153 0.102 0.124 0.127 3.04 2.11 14 0.239 0 0.288 2.85 0.085 0.160 0 0.129 2.45 0.155 0.123 0 0.010 0.372 0.001 0.241 0.107 0 2.91 2.32 14 0.222 0 0.200 1.38 1.05 0.259 0 0.147 2.39 0.423 0 0.084 0.061 0.534 0.618 0.233 0.115 0 2.46 1.54 14.5 0.164 0.019 0.117 1.48 0.804 0.368 0.018 0.158 2.64 0.171 0.191 0.029 0.103 0.617 0.463 0.233 0.134 0.096 2.10 0.045 14.5 0.131 0 0.116 1.48 1.11 0.334 0.157 0.081 2.59 0.083 0.104 0.052 0.097 0.523 0.276 0.224 0.024 0.211 1.79 0.110 15 0.280 0.018 0.273 1.54 0 0.225 0.112 0.120 2.18 1.73 0.216 0.173 0 0.557 0 0.103 0.072 0 1.84 0.087 15 0.286 0.052 0.011 1.42 0.177 0.143 0.001 0.041 1.39 1.00 0 0.064 0.070 0.675 0.487 0.198 0 0 1.89 0.022 15.5 0.455 0.042 0.112 1.28 0.305 0.269 0.127 0.143 1.39 0.901 0.047 0 0 0.616 0.505 0.070 0.123 0 1.17 0.909 15.5 0.172 0.020 0.815 0.835 0.279 0.091 0.016 0 1.07 0.110 0.263 0.019 0.122 1.10 0.609 0.234 0.045 0 1.43 0.843 16 0.176 0.123 1.15 0.574 0.506 0.225 0.053 0.127 1.00 0.822 0.210 0 0 0.962 0.804 0.217 0.010 0 1.68 0 16 0.096 0.097 7.89 0.713 0.664 0.097 0.002 0.011 0.898 0.004 0.141 0.042 0.142 0.896 0.568 0.249 0.058 0.050 1.23 0.911 16.5 0.125 0.122 4.13 0.935 0.582 0.177 0.043 0.217 0.743 0.659 0.173 0 0.084 1.01 0.160 0.162 0.162 0 1.12 0.629 16.5 0.101 0.075 0.287 0.708 0.087 0.107 0.059 0 0.937 0.856 0.187 0 0 1.25 0.883 0.033 0.124 0 0.721 0.361 17 0.013 0.072 0.150 0.605 0.401 0.125 0.133 0.040 0.656 0.406 0.266 0.156 0.143 1.24 0.193 0.072 0.061 0 0.646 0.521 17 0.003 0.132 0.210 0.589 0.387 0.102 0 0.113 0.659 0.594 0.283 0 0 1.88 1.70 0.088 0.160 0.013 0.596 0 17.5 0 0 0.261 0.190 0.189 0.121 0 0 0.691 0.228 0.256 0 0.032 1.83 1.58 0.088 0.092 0 0.670 0.504 17.5 0.079 0.075 0.187 0.383 0.337 0.088 0.022 0.098 0.587 0.347 0.192 0.065 0.048 1.75 0.316 0.128 0.136 0.099 0.563 0.408 18 0.090 0.245 0.096 0.546 0.285 0.180 0.148 0.052 0.596 0.430 0.251 0.136 0.051 2.04 0.995 0.085 0 0 0.571 0.387 18 0.050 0.144 0.182 0.392 0.230 0.115 0.009 0.125 0.888 0 0.281 0.185 0.099 3.78 0.379 0.082 0 0.089 0.261 0.198 18.5 0.141 0 0.111 0.309 0.315 0.225 0.064 0.016 0.526 0.379 0.432 0.139 0.125 3.35 2.84 18.5 0.148 0.059 0.216 0.273 0.096 0.156 0.115 0.104 0.564 0.118 0.037 0 0.087 0.508 0.217

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJFC-005CV B101110-CJFC-006CV B101110-CJWC-007CV B101110-CJFC-008CV Depth pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 19 0 0.006 0.166 0.264 0.310 0.128 0.020 0.011 0.134 0.224 0.066 0 0.078 0.081 0.190 0.108 0.096 0.075 0.234 0.000 19 0.155 0.031 0.194 0.149 0.161 0.018 0.046 0.040 0.229 0.364 0.092 0.108 0.057 0.300 0.173 0.079 0.037 0.794 0.277 0.178 19.5 0.104 0.023 0.183 0.356 0.210 0.165 0.004 0.051 0.378 0.339 0.103 0.060 0.139 0.084 0.176 0 0.043 0.696 0.301 0.089 19.5 0.142 0.143 0.175 0.177 0.192 0.106 0.102 0 0.326 0.165 0.076 0.045 0.166 0.201 0.272 0 0.075 0.198 0.531 0.213 20 0.056 0.217 0.181 0.180 0.008 0.133 0.184 0 0.172 0.100 0 0 0.063 0.100 0.170 0.105 0.008 0.014 0.385 0.321 20 0.153 0.054 0.310 0.150 0.134 0.165 0.039 0.109 0.039 0.247 0.066 0 0.024 0.263 0.136 0.033 0 0.057 0.233 0.108 20.5 0.138 0.033 0.419 0.394 0.230 0.051 0.027 0.090 0.309 0.056 0 0.023 0.110 0.163 0.137 0.161 0.011 0 0.018 0.190 20.5 0.083 0.087 0.142 0.264 0.109 0.216 0.048 0.131 0.533 0.173 0.097 0.142 0.079 0.207 0.084 0.095 0.075 0.011 0.197 0 21 0.038 0.143 0.153 0.155 0.047 0.155 0.077 0 0.122 0.120 0.213 0.126 0.157 0.032 0.130 0.137 0.080 0.097 0.199 0.187 21 0.017 0 0.223 0.094 0.096 0.134 0.039 0.114 0.129 0.142 0 0.104 0.103 0.128 0.084 0.027 0 0.028 0.091 0.215 21.5 0.091 0.024 0.239 0.292 0.098 0 0 0.105 0.158 0.044 0.114 0.047 0.184 0.081 0.239 0 0.015 0.006 0.088 0.054 21.5 0.148 0.054 0.305 0.046 0.019 0.026 0.027 0 0.722 0.087 0.188 0 0.260 0.025 0.024 0.049 0.039 0.111 0.229 0.083 22 0 0 0.311 0.067 0.116 0 0.133 0.069 0.120 0.072 0.093 0.029 0.447 0.211 0.086 0.052 0 0.116 0.236 0.079 21.5 0.113 0 0.052 0.041 0.168 22 0.104 0.038 0.134 0.189 0.125 22 0 0.040 0.355 0.060 0.106 0.058 0 0.028 0.518 0.186 0.087 0.111 0.837 0.189 0.037 22.5 0 0.008 0.389 0.029 0.093 0.101 0.015 0.104 0.011 0.029 0.107 0.139 1.49 0.398 0.147 22.5 0.105 0.024 0 0.078 0.024 23 0.009 0.120 0 0 0.074 23 0.061 0 0.011 0.170 0.099 23.5 0.078 0.234 0.063 0.004 0.199 23.5 0.204 0.078 0.097 0.044 0.060 24 0.073 0.020 0.016 0 0.001 24 0.136 0.063 0.111 0.282 0.203 24.5 0.149 0 0.006 0.005 0.005 24.5 0.068 0 0.020 0.003 0.064 25 0.026 0.020 0.083 0.158 0.049

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJWC-009CV B101110-CJWC-010CV B101110-CJWC-011CV B101110-CJWC-015CV Depth pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 0 4.01 0.197 0.759 40.3 2.42 4.33 0.109 2.75 31.4 3.14 5.83 0 23.4 35.0 3.18 9.27 0.161 65.8 53.3 3.35 0.5 4.29 0.065 0.842 44.7 3.20 4.09 0 1.09 38.1 1.31 5.17 0.194 11.7 33.7 2.26 7.42 0 33.8 59.8 4.30 0.5 6.06 0 0.233 53.9 3.05 3.06 0.287 0.150 42.8 2.24 3.54 0.462 0 37.7 2.34 4.73 0.288 3.40 73.1 4.64 1 5.93 0 0 51.3 2.88 3.10 0.103 0 42.7 2.18 3.64 0.082 0.251 37.6 2.37 4.78 0.276 2.99 67.1 4.28 1 7.13 0 0 52.8 1.95 4.27 0.050 0 47.0 2.38 3.75 0 0 50.5 2.89 5.80 0.831 0.82 70.1 3.59 1.5 6.99 0 0.142 54.2 3.04 4.35 0.190 0.225 49.9 2.72 3.61 0.626 0 52.6 2.62 5.62 0.317 0.302 68.4 51.6 1.5 7.54 0.184 0.220 58.7 3.33 3.66 0.194 0 52.9 41.3 4.03 0.266 0 63.4 3.35 6.21 0.395 1.96 66.5 4.47 2 7.51 0.650 0.742 56.3 2.96 3.77 0.349 0 53.0 2.76 4.39 0.361 0.325 69.0 3.80 5.63 0.191 1.49 65.5 3.71 2 3.30 0.135 0.026 43.7 1.79 3.64 0.087 0 47.8 2.11 3.92 0.058 0.155 46.7 1.84 21.6 0 0 16.5 0.748 2.5 3.21 0 0 45.3 1.87 3.86 0.121 0 48.0 2.23 3.06 0.400 0 44.6 2.07 2.5 4.29 0 0 55.6 2.82 2.73 0.255 0.456 37.0 1.78 3.05 0.287 0 39.6 1.77 3 4.11 0 0 54.3 2.60 3.20 0.292 0 40.3 2.24 2.74 0.392 0.079 39.3 1.67 3 3.69 0.228 0 49.6 3.16 4.08 0.375 0.135 46.3 2.25 2.50 0 0 31.5 1.48 3.5 3.47 0.529 0.052 47.3 2.57 4.27 0.406 0.305 50.5 0.543 21.9 0.125 0.235 14.1 0.728 3.5 3.29 0 0 39.5 1.66 5.03 0.139 0 48.0 1.87 3.88 0.628 0.092 53.0 2.88 4 3.42 0.047 0.511 37.3 1.62 4.74 0 0 44.5 1.55 2.51 0 0.136 31.4 1.40 4.22 0.707 0 54.4 1.88 4 2.20 0 0.084 31.1 1.71 2.40 0.019 0.164 33.2 1.41 4.11 0.493 0 39.7 2.06 4.47 0 0 58.0 3.17 4.5 2.04 0 0.019 30.0 1.81 2.31 0 0.106 33.5 1.22 3.69 0.175 0.050 37.6 1.67 5.00 0.059 0.151 59.4 1.85 4.5 2.61 0.476 0 29.0 1.44 2.52 0 0 26.3 1.48 2.62 0.308 0.238 30.3 1.25 7.38 0.531 0 59.5 2.58 5 2.13 0.126 0 28.5 1.41 2.76 0.185 0.044 28.1 1.37 2.38 0 0.133 30.0 1.44 6.17 0.325 0 54.0 2.58 5 2.46 0.723 0 28.1 1.34 3.11 0.054 0.117 27.8 1.24 2.73 0.219 0 26.2 1.00 4.84 0 0 48.8 2.55 5.5 2.20 0.097 0 28.3 1.11 2.98 0 0.299 25.4 0.767 2.43 0.195 0.322 25.0 1.17 4.59 0.275 0 47.7 1.73 5.5 1.47 0 0.172 19.1 1.20 1.25 0.040 0 19.1 15.2 1.43 0 0.123 29.0 1.44 2.53 0 0.223 37.9 2.33 6 1.57 0.234 0.073 18.3 0.774 1.32 0.078 0.063 19.5 1.10 1.50 0.474 0.297 27.0 20.8 2.28 0.365 0 35.8 1.19 6 1.27 0.102 0 16.5 0.543 2.52 0.010 0.090 20.9 0.664 1.41 0.230 0 19.6 15.8 2.93 0 0.327 3.70 1.41 6.5 1.26 0 0.201 15.9 0.637 2.70 0.112 0.359 21.0 0.692 1.39 0 0 20.0 0.550 3.61 0.831 0 34.60 1.15 6.5 1.25 0.101 0.209 15.2 0.184 1.68 0 0.022 16.4 0.909 1.14 0 0.280 15.0 0.961 7.59 0.335 0.234 38.90 2.38 7 1.41 0.167 0.078 15.9 11.8 1.42 0.163 0.112 14.6 0.555 1.19 0.124 0.084 14.7 0.773 7.83 0.018 0 36.80 1.90 7 1.22 0 0.038 18.1 1.10 0.98 0.046 0 11.9 0.669 1.36 0 0.049 15.7 0.450 1.97 0 0.093 27.30 1.37 7.5 1.09 0.317 0.103 17.4 0.32 1.01 0.126 0.130 14.3 0.289 1.22 0 0 14.4 0.576 9.60 0.086 0.046 27.30 1.23 7.5 0.755 0 0.030 11.3 1.03 1.16 0.036 0.116 11.9 8.84 1.16 0.224 0.071 12.4 0.477 1.30 0.099 0.160 22.1 1.03 8 0.633 0.311 0.187 10.1 0.470 1.27 0.179 0 10.8 0.390 1.38 0.240 0 12.3 2.31 1.30 0.097 0.104 21.8 1.17 8 0.737 0 0.103 9.14 0.928 0.798 0.054 0.096 8.71 0.032 1.22 0.007 0.215 11.3 0 1.24 0 0 17.9 1.05 8.5 0.790 0.020 0 8.82 0.773 0.856 0.000 0.017 8.53 6.27 0.992 0.049 0.078 10.7 0.890 1.24 0.413 0 17.2 1.03 8.5 0.787 0.184 0.194 7.69 0.670 0.251 0.037 0 5.51 3.87 1.00 0 0.238 9.53 6.95 0.940 0.158 0.081 14.0 0.733 9 0.617 0 0 8.08 0.384 0.890 0.031 0.032 9.81 0 1.04 0.223 0.083 13.7 0.828 9 0.130 0.012 0.014 1.05 0.925 0.747 0 0 8.24 0 0.907 0.239 0 12.0 0.341 9.5 0.230 0.039 0.097 1.02 0.662 0.294 0 0.079 4.88 0.301 0.666 0 0.073 7.99 5.65 0.683 0.233 0 11.2 8.68

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJWC-009CV B101110-CJWC-010CV B101110-CJWC-011CV B101110-CJWC-015CV Depth pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 9.5 0.086 0 0.118 1.31 0.903 0.266 0.099 0.240 5.38 0.693 0.107 0.037 0.006 1.47 1.05 0.594 0 0.125 7.81 0.362 10 0.350 0.028 0.113 6.37 0 10 0 0.038 0 0.519 0.092 10.5 0.068 0 0.153 1.01 0.716 0.209 0.145 0.018 0.482 0.356 0.081 0.024 0.011 1.52 0.119 0.466 0.144 0.155 7.56 0.310 10.5 0.241 0.033 0 1.47 0.233 0.237 0.017 0 0.848 0.791 0.674 0.205 0.000 8.29 0.562 0.493 0.081 0.063 7.40 0.571 11 0.312 0 0.101 1.42 0.031 0.165 0 0.042 0.816 0.542 0.682 0 0.063 6.95 0.850 0.463 0.024 0.126 7.39 0.194 11 0.160 0.188 0.002 0.88 0.497 0.170 0 0.167 0.891 0.499 0.266 0.018 0 3.64 2.16 0.585 0 0 5.54 0.209 11.5 0.101 0.006 0 0.665 0.691 0.106 0.018 0.018 1.03 0.759 0.343 0 0 3.77 2.75 0.228 0.119 0.164 5.18 0.236 11.5 0.120 0.030 0.050 0.887 0.562 0.323 0 0 1.71 0.009 0.289 0.223 0.146 2.62 0.141 0.429 0 0.175 4.80 0.037 12 0.029 0.082 0 0.835 0 0.123 0 0.136 1.63 1.45 0.283 0.114 0.222 2.94 0 0.405 0.094 0.153 5.17 0.387 12 0.158 0 0.100 0.633 0.420 0.243 0 0 1.92 1.17 0.106 0.174 0.071 1.91 0.347 0.371 0.009 0.097 4.08 0.603 12.5 0.074 0.022 0 0.601 0.415 0.189 0 0.032 1.71 0 0.130 0 0.049 1.72 0.334 0.306 0.113 0.011 3.81 0.873 12.5 0.112 0.077 0.070 0.578 0.392 0.153 0.146 0.019 2.55 1.75 0.305 0.134 0.056 2.02 0.022 0.404 0.073 0 3.41 0 13 0 0.059 0.116 0.464 0.137 0.176 0.046 0.135 2.35 1.51 0.123 0.117 0.012 1.77 0.368 0.406 0.095 0.026 3.03 2.44 13 0.087 0 0 0.174 0.216 0.183 0 0.098 2.51 0 0.163 0.088 0.175 1.66 0.151 0.295 0.014 0.186 4.40 3.40 13.5 0.158 0.154 0.020 0.129 0.393 0.281 0.033 0.103 2.61 0.185 0.129 0.108 0.138 1.38 0.164 0.311 0.128 0 4.03 2.79 13.5 0.065 0.032 0.067 0.210 0.108 0.292 0.115 0.005 3.87 0.121 0.023 0.105 0.116 1.11 0.018 0.335 0.020 0.095 2.71 0.403 14 0.119 0.081 0.103 0.278 0.183 0.177 0.149 0 3.97 0.371 0.085 0.058 0.101 1.02 0.441 0.308 0.050 0.054 2.64 0.015 14 0.413 0.119 0.277 7.82 5.47 0.077 0 0.037 3.68 0.275 0.077 0.149 0 1.43 0.948 0.185 0 0.066 2.00 0.281 14.5 0.314 0.068 0.101 7.43 0.429 0.229 0.021 0 3.82 0.047 0.180 0.255 0 1.25 0 0.257 0.058 0.026 1.93 0.030 14.5 0.597 0.082 0.148 6.21 0.144 0.331 0.017 0 5.17 3.53 0.211 0.126 0 1.36 0.283 0.171 0 0 1.24 1.13 15 0.409 0.068 0.291 5.41 0.268 0.336 0.072 0.085 5.38 3.54 0.116 0.028 0.037 1.15 0.113 0.198 0 0.005 1.57 0.407 15 0.455 0 0.402 5.13 4.23 0.140 0 0.036 0.489 0.395 0.046 0 0.043 0.950 0.633 0.358 0 0.026 1.18 0.721 15.5 0.569 0.014 0.339 6.01 0.37 0.192 0 0.065 0.498 0.401 0.085 0.043 0 0.838 0.482 0.168 0.094 0 1.19 0.155 15.5 0.209 0.036 0 3.62 3.11 0.026 0.030 0.152 0.456 0.456 0.191 0 0.154 0.654 0.572 0.247 0.015 0.067 0.747 0.153 16 0.378 0.204 0.116 3.67 0.397 0.159 0 0.064 0.620 0.220 0.114 0 0 0.674 0.460 0.096 0.009 0.051 0.806 0.460 16 0.240 0.065 0.128 2.86 2.19 0.000 0.012 0.086 0.179 0.081 0.177 0.020 0 0.352 0.372 0.117 0.103 0.160 0.830 0.390 16.5 0.218 0.122 0.013 2.79 2.01 0.017 0.032 0.095 0.371 0.116 0.197 0.275 0.126 0.548 0.320 16.5 0.318 0.090 0.094 2.83 0.640 0.088 0.116 0.306 0.605 0.654 17 0.241 0.030 0.020 2.89 0.006 0.036 0 0.097 0.164 0.133 0.136 0.015 0.001 0.099 0.059 17 0.168 0 0.059 2.27 0.278 0.027 0 0.012 0.351 0.009 0.194 0 0.048 0.281 0.194 17.5 0.186 0.053 0 2.22 0.213 0.156 0 0.215 0.480 0.290 0 0.029 0.166 0.168 0.195 17.5 0.013 0.023 0.020 0.021 0.105 0 0.075 0.201 0.048 0.334 18 0.100 0 0.032 0.349 0.106 0.049 0.096 0.076 0.310 0.218 18 0 0 0.081 0.258 0.052 0.041 0.093 0 0.242 0.059 18.5 0 0.030 0.105 0.135 0.088 0.056 0.023 0.111 0.289 0 18.5 0.022 0.028 0.050 0.072 0.437 0.051 0 0.009 0.174 0.363

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJWC-009CV B101110-CJWC-010CV B101110-CJWC-011CV B101110-CJWC-015CV Depth pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 19 0.116 0 0.077 0.166 0.099 0.140 0.029 0 0.204 0.182 19 0.033 0.112 0.081 0.103 0.073 0.082 0.213 0.069 0.064 0.337 19.5 0.101 0 0.082 0.199 0.059 0.079 0.020 0.138 0.260 0.160 19.5 0.106 0 0.091 0 0 0.139 0.084 0.053 0.303 0.655 20 0.038 0 0.066 0.082 0.193 0.090 0.039 0.014 0.382 0 20 0.179 0 1.55 0.449 0.021 0.136 0 0.012 0.101 0.191 20.5 0.138 0.081 2.50 0.169 0.438 0.026 0.005 1.08 0.295 0.023 20.5 0.082 0.027 0 0.028 0.082 21 0.123 0.105 0.557 0.354 0.096

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJWC-016CV B101110-CJWC-017CV B101110-CJWC-018CV B101110-CJWC-019CV Depth pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 0 70.6 0 0.611 1100 48.4 123 2.03 3.49 1880 86.5 13.1 0.535 3.53 169 11.9 159 0.182 0 2470 117 0.5 77.3 0.312 0.091 1160 52.5 133 0.041 0 2040 91.0 12.9 0.522 2.07 182 10.8 166 0.729 0 2550 118 0.5 65.5 1.86 0 1040 45.9 114 0 0 1550 75.9 37.9 0.700 0 324 21.3 202 0.908 0.360 2500 119 1 66.9 2.96 0 1050 51.3 104 0 0 1410 65.0 37.2 0.546 0.494 334 19.7 198 2.66 0 2480 120 1 90.4 0.484 0 1010 45.0 117 1.04 0.303 1250 55.7 26.9 0.203 0 311 17.4 154 3.94 2.90 2100 96.1 1.5 101 0 0 990 43.4 118 0.886 1.07 1260 55.5 25.1 0 0 303 19.3 138 1.43 0 1950 88.0 1.5 67.4 0.182 0 896 38.8 83.2 0.393 0.276 988 44.3 21.0 0.879 1.82 278 15.5 93.7 0.882 0.004 1520 72.2 2 64.4 0.220 0 882 40.9 87.4 0.109 0 1000 44.4 22.7 0.993 0.355 282 17.5 94.8 1.37 0 1450 71.1 2 40.0 0.035 1.27 627 26.3 75.9 0 0 942 42.4 35.0 0.404 1.00 357 18.8 69.8 0.227 1.14 949 42.9 2.5 40.0 0.183 0 647 27.8 73.1 0 2.18 938 41.2 34.5 0 0.237 351 19.2 136.0 1.12 0.289 1600 69.7 2.5 40.7 0.249 0 564 23.2 61.9 0 0 850 37.0 21.5 0.062 0 268 13.9 119.0 2.12 0.329 1310 62.8 3 39.5 0.616 0 541 23.2 61.5 0.638 0 856 36.4 20.3 0 0.747 264 11.6 96.3 1.56 0 1210 54.1 3 29.7 0.333 0 446 17.5 49.5 1.56 0 747 33.7 17.5 0.682 0 234 11.6 71.6 0.627 0.431 953 39.5 3.5 28.8 0.240 0.448 445 128.6 48.6 0.086 0 724 30.7 17.1 0 0 235 10.4 72.9 0.995 0.394 991 41.6 3.5 30.7 0.009 0.177 452 18.3 33.0 0 0 527 22.9 16.3 0.102 0.163 187 9.6 64.7 0.022 0.819 886 37.2 4 28.4 0.620 0 417 16.5 32.5 0.139 0 527 22.4 15.3 0 0.089 189 10.1 66.8 0.452 0 876 37.8 4 27.1 0.494 0 354 15.8 40.3 0 0 556 24.0 14.7 0 0.027 174 9.42 48.0 0.103 0 717 29.2 4.5 24.9 1.09 0.382 325 14.3 38.3 0.052 0 521 23.1 16.2 0 0 182 7.67 45.1 0.015 0.744 657 28.8 4.5 12.5 0.183 0.262 210 8.87 32.8 0 0.246 364 15.0 11.6 0 0.047 48.1 2.07 64.7 0 0 638 26.8 5 12.0 0.809 0 193 7.34 35.8 0.000 0 374 15.7 66.1 0.351 0.313 625 27.2 5 19.3 1.64 0 278 11.7 36.1 0.540 0 376 17.9 30.6 1.34 0.218 422 17.2 5.5 17.3 0.611 0.279 289 11.9 31.3 0 0 352 14.5 26.7 0.396 0.120 407 16.4 5.5 19.8 0.182 0 306 12.9 17.6 0.298 0 306 13.6 31.1 1.95 0 435 19.8 6 19.4 0.409 0.390 291 11.8 17.5 0.692 0 304 11.3 8.86 0.119 0.062 42.2 2.14 32.0 0.171 0 444 18.2 6 13.4 0.145 0 148 5.53 16.4 0.646 0 261 10.2 5.64 0.043 0.701 89.2 4.48 29.0 2.27 0 436 18.8 6.5 15.6 0.164 0.418 149 7.75 16.8 0.298 0 263 10.7 5.90 0.308 0 89.3 3.70 26.7 0.160 0 427 16.7 6.5 10.8 0.957 0.242 142 5.32 17.2 0 0 225 8.80 8.69 0.069 0.047 76.8 3.36 15.9 0.059 0 254 9.66 7 10.5 0.528 0 145 5.04 14.9 0 0 214 10.2 8.43 0.070 0.101 74.9 3.39 17.9 0.472 0 274 11.2 7 9.04 0.423 0 121 5.22 9.25 0.164 0 161 6.91 6.22 0.330 0 66.6 2.71 17.5 0 0 231 10.7 7.5 8.86 0.184 0 113 4.70 9.54 0.344 0 155 5.94 4.97 0.714 0 68.5 2.19 17.0 1.19 0.412 227 10.1 7.5 6.41 0.648 0.231 91.3 4.20 9.17 0.285 0 121 5.51 3.79 0.156 0 59.6 2.98 12.4 0.210 0 214 8.59 8 6.37 0.088 0.191 90.2 3.58 8.70 0.312 0 121 5.02 4.11 0.226 0 59.3 3.14 12.5 0.084 0.116 220 9.26 8 4.42 0.005 0.331 74.8 3.69 5.95 0.188 0 110 5.86 5.41 0.127 0 54.3 2.40 11.1 0.138 0 164 6.41 8.5 3.94 0.353 0.894 72.4 2.51 5.62 0 0.117 103 4.68 4.98 0.896 0.552 53.1 2.75 10.3 0 0 161 6.90 8.5 4.98 0 0.338 65.4 2.70 7.13 0 0.507 89.8 3.64 3.42 0.326 0 39.5 0.991 10.2 0 0 129 4.76 9 5.22 0 0.325 63.9 2.42 6.83 0.162 0.162 86.5 3.35 3.22 0 0.275 38.1 2.17 9.71 0.450 0 123 5.08 9 2.22 0.111 0 32.1 1.77 4.28 0 0 60.9 2.58 3.34 0.120 0 36.4 2.08 5.60 0 0 114 4.67 9.5 1.99 0.183 0.027 30.4 1.19 4.18 0.124 0.423 63.7 1.24 3.94 0.452 0 36.4 1.48 5.07 0.772 0 102 4.15

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJWC-016CV B101110-CJWC-017CV B101110-CJWC-018CV B101110-CJWC-019CV Depth pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 9.5 1.66 0 0.297 26.6 2.06 3.23 0.117 0 57.2 3.00 3.83 0.104 0.094 32.2 1.71 4.60 0.187 0 73.5 2.93 10 1.35 0.206 0.286 26.0 1.92 3.64 0.978 0.390 58.2 2.28 3.47 0.027 0 33.0 1.14 5.55 0 0 79.7 3.50 10 2.52 0 0 37.7 1.68 2.14 0 0 35.6 1.29 1.38 0.513 0.192 18.5 0.643 5.23 0 0 75.0 2.69 10.5 2.31 0.169 0.281 34.9 1.23 1.99 0.510 0.154 30.4 1.07 1.34 0.021 0.362 18.1 0.511 4.92 0.321 0 80.5 61.3 10.5 1.32 0 0.168 19.6 0.596 1.66 0.037 0 20.5 0.235 4.25 0.728 0 73.1 54.9 11 1.25 0.143 0.250 18.4 0.151 2.14 0.610 0.375 19.7 0.358 4.65 0.046 0 71.8 2.56 11 1.42 0.046 0.267 16.4 1.06 1.84 0 0.240 17.5 0.491 3.45 0.095 0 46.2 2.14 11.5 1.34 0.046 0.062 17.1 0.667 1.77 0.234 0.259 16.0 1.280 3.93 0.153 0.151 44.3 0.99 11.5 0.989 0 0.127 15.0 0.442 1.04 0.115 0.128 13.5 0.153 3.63 0.522 0.166 44.7 1.83 12 0.918 0.110 0 14.0 0.433 0.939 0 0 12.3 0.939 2.68 0.290 0.556 41.4 1.29 12 0.737 0.102 0.018 11.3 0.246 0.514 0.295 0.174 10.3 0.457 12.5 0.774 0.039 0.175 10.7 0.825 0.601 0 0 10.0 0.315 12.5 0.561 0.005 0.047 7.63 0.166 0.574 0.100 0.058 8.19 0.378 13 0.435 0.040 0 7.90 1.110 0.589 0.012 0 8.59 0.340 13 0.362 0 0.026 5.89 0.148 0.557 0.317 0 12.9 0.886 13.5 0.330 0 0.120 5.49 0.254 0.540 0 0 12.4 1.06 13.5 0.278 0 0.013 3.35 0.182 0.330 0.129 0 5.83 0.866 14 0.209 0.021 0.157 2.77 0.068 0.327 0.051 0.013 5.03 3.92 14 0.264 0.227 0 3.78 2.77 14.5 0.229 0 0 3.85 2.45 14.5 0.319 0.002 0.065 3.04 0.156 15 0.214 0.025 0.019 3.11 0.083 15 0.304 0 0.236 3.36 0.058 15.5 0.413 0.127 0 2.88 0.444 15.5 0.281 0 0.011 2.43 0.443 16 0.138 0 0.090 2.45 0 16 0.094 0.028 0.006 1.49 0.123 16.5 0.103 0 0.074 1.37 1.04 16.5 0.182 0 0.046 1.06 0 17 0 0.019 0.160 1.17 0.066 17 0.277 0 0 0.921 0.399 17.5 0.300 0.011 0 1.06 0.853 17.5 0.155 0 0.144 0.841 0.221 18 0.086 0 0.034 0.700 0.655 18 0.002 0.066 0 0.641 0.432 18.5 0.018 0 0.018 0.624 0.485 18.5 0.128 0.038 0.052 0.554 0.353

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 4 (continued) - Unit 1 Containment Continuing Characterization Concrete Core Samples - On-Site Analysis B101110-CJWC-016CV B101110-CJWC-017CV B101110-CJWC-018CV B101110-CJWC-019CV Depth pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm pCi/gm (in) Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 Co-60 Cs-134 Cs-137 Eu-152 Eu-154 19 0.092 0.033 0.055 0.164 0.133 19 0.123 0.119 0 0.508 0.184 19.5 0.098 0 0.024 0.559 0.192 19.5 0.110 0 0.015 0.222 0.040 20 0.180 0.165 0.044 0.326 0.250 20 0.080 0.078 0 0.204 0.114 20.5 0.037 0.042 0 0.083 0.178 20.5 0.143 0.021 0 0.260 0.084 21 0.169 0.022 0.146 0.505 0.214

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 5 - Unit 1 Containment Continuing Characterization Concrete Core Samples - Eberline Laboratory Analyses B101110-CJWC-002CV B101110-CJFC-005CV Nuclide Result Uncertainty MDA Result Uncertainty MDA

>MDA >MDA (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g)

H-3 3.24E+01 1.42E+01 2.29E+01 Yes 3.50E+01 1.58E+01 2.56E+01 Yes C-14 6.14E+00 1.86E+00 2.97E+00 Yes 8.16E+00 2.43E+00 3.87E+00 Yes Fe-55 2.65E+01 1.62E+01 2.42E+01 Yes 1.39E-01 1.19E+01 1.79E+01 No Ni-59 0.00E+00 2.98E+01 4.64E+01 No 1.57E+02 9.68E+01 1.53E+02 Yes Co-60 1.13E+02 7.71E+00 7.50E+00 Yes 6.27E+02 4.24E+01 3.73E+01 Yes Ni-63 5.58E+03 2.07E+01 2.91E+00 Yes 9.00E+03 3.98E+01 6.69E+00 Yes Sr-90 1.53E+02 3.37E+00 7.92E-01 Yes 2.86E+01 1.51E+00 7.82E-01 Yes Nb-94 4.94E-01 3.94E+00 5.76E+00 No 1.23E+01 1.53E+01 2.09E+01 No Tc-99 2.01E+00 7.72E-01 1.25E+00 Yes 1.29E+00 7.49E-01 1.24E+00 Yes Ag-108m 1.94E+00 6.14E+00 8.90E+00 No 1.65E+01 2.81E+01 3.74E+01 No Sb-125 0.00E+00 8.85E+01 1.10E+02 No 1.30E+02 1.79E+02 2.36E+02 No Cs-134 0.00E+00 1.42E+01 6.61E+00 No 3.39E+01 3.05E+01 2.42E+01 Yes Cs-137 6.77E+04 1.19E+04 6.27E+01 Yes 1.02E+05 1.68E+04 2.58E+02 Yes Pm-147 3.07E+01 1.47E+00 1.57E+00 Yes 3.27E+01 1.51E+00 1.59E+00 Yes Eu-152 7.67E+01 1.33E+01 1.18E+01 Yes 6.59E+01 1.84E+02 5.94E+01 Yes Eu-154 1.32E+00 5.25E+00 8.15E+00 No 0.00E+00 1.92E+01 3.00E+01 No Eu-155 0.00E+00 2.80E+01 2.93E+01 No 0.00E+00 6.88E+01 6.53E+01 No Np-237 2.64E-03 3.68E-02 1.05E-01 No 8.64E-03 5.42E-02 1.31E-01 No Pu-238 3.56E-02 6.78E-02 1.25E-01 No 0.00E+00 5.87E-02 1.39E-01 No Pu-239/240 1.07E-01 1.07E-01 1.25E-01 No 0.00E+00 5.86E-02 1.39E-01 No Pu-241 0.00E+00 8.07E+00 1.41E+01 No 0.00E+00 7.35E+00 1.30E+01 No Am-241 2.21E-01 1.32E-01 1.01E-01 Yes 6.73E-02 7.33E-02 8.79E-02 No Am-243 4.98E-02 8.47E-02 1.49E-01 No 8.20E-03 3.42E-02 8.78E-02 No Cm-243/244 0.00E+00 3.60E-02 7.55E-02 No 4.92E-02 6.39E-02 8.85E-02 No

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 6 - HTD Ratios Based on Continuing Characterization Concrete Core Samples Sample ID H-3 to Cs-137 Ni-63 to Co-60 Sr-90 to Cs-137 B101110-CJWC-002CV 0.0005 49.38 0.0023 B101110-CJFC-005CV 0.0003 14.35 0.0003 The maximum LTP Chapter 5, Table 5-15 Ni-63/Co-60 ratio of 442 was not exceeded by the highest Ni-63/Co-60 ratio of 49.38 reported in the continuing characterization HTD results from Eberline. In fact, all continuing characterization ratios were lower by an order of magnitude or more, and as a result, no adjustments to the Table 5-15 ratios, or post remediation core sampling were required.

The secondary objective of the continuing characterization concrete core samples was to assess the depth of activation in the concrete in order to ensure the correct geometry was used for the ISOCS measurements. Based on an analysis of the analytical results of ROC concentrations at depth as presented in Table 4, an exponential circular plane geometry with a 17.8 cm depth of contamination and a relaxation length (DRL) of 8.6 cm was chosen as the default template.

LTP section 5.1 states, concrete cores will be collected during FSS to confirm the HTD to surrogate radionuclide ratios used for the surrogate calculation. Only HTD radionuclides included as ROC (H-3, Ni-63, Sr-90, for Containment and Ni-63 and Sr-90 for all other structures and soils) will be analyzed in the FSS confirmatory samples.

Concrete cores will be collected from the Auxiliary Building basement, SFP/Transfer Canal, and the Under-Vessel areas in Containment where concrete will remain. The number of cores collected and analyzed for ROC HTD will be ten percent (10%) of the FSS ISOCS measurements. The concrete core locations will be selected from the floor and lower walls in the survey unit to alleviate safety concerns from working at heights and to focus on the areas expected to contain the majority of residual radioactivity.

The survey design for the Under Vessel concrete as specified in LTP Table 5-19, required a minimum of 19 ISOCS measurements and consequently, two additional concrete core samples were collected to meet the requirements of LTP section 5.1. As a consequence of the results of the concrete core samples taken during continuing characterization, an additional 19 concrete cores were taken from the post-remediated concrete walls and floors. These concrete core sample represent the as-left condition of the under-vessel concrete at the time FSS was performed. At least a foot of concrete was removed from the Under Vessel floor and up to 6 inches of concrete removed from the walls. A 6-inch concrete core was obtained at the center of the Field-of-View (FOV) of every ISOCS measurement acquired in the Under Vessel region (for a total of nine) and adjacent to the location of the continuing characterization cores. The pucks representing the existing post

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 remediation grade of the concrete to a depth of 1/2 inch for the 19 selected locations were sent to Eberline Laboratories for analysis results for Total Strontium, Tritium, Ni-63 and gamma spectroscopy. The results are presented in section 7 of this Release Record.

Containment turnover also included the continuing characterization survey of the exposed steel liner above the 565 ft. elevation. The objective of the survey was to assess the radiological condition of the exposed steel liner above the 565 foot elevation after the contaminated concrete has been removed. The liner was subjected to sufficient smear samples and beta scans of the accessible surfaces to demonstrate that the liner was adequately decontaminated prior to FSS. Locations for taking samples and/or measurements were biased toward locations with high potential for the presence of loose or fixed contamination. All swipe samples taken showed loose surface contamination results that were less than 1,000 dpm/100cm2.

During the removal of the concrete from the floor above the 565 ft. elevation, several instances occurred where the steel liner was punctured by the ram-hoe used to break apart the concrete. During these occurrences, work was stopped and the area was surveyed for loose surface contamination. In all cases, swipe samples taken of the puncture locations showed loose surface contamination of less than 1,000 dpm/100cm2.

No conditions were encountered that indicated any potential cross-contamination of media outside of the liner. A patch was welded over each puncture location to prevent any future potential cross-contamination.

A Radiological Engineer (RE) performed a visual inspection and walk-down of the survey units on 02/27/2018 prior to performing FSS. The purpose of the walk-down was to assess the physical condition of the survey units, evaluate access points and travel paths and identify potentially hazardous conditions. A final classification assessment was performed in accordance with procedure ZS-LT-300-001-002, Survey Unit Classification (Reference 8) as part of the survey design for FSS.

Based upon completion of the Survey Unit Classification Basis for final classification, which included a review of the historical information, the results of the Characterization Survey data and, completion of a final Survey Unit Classification Worksheet, the correct final classification of Survey Units #B1-01100AF and #B1-01110AF was determined to be Class 1.

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

[40]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 given survey is 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 is to demonstrate that the level of residual radioactivity in Survey Units #B1-01100AF and #B1-01110AF 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).

ZionSolutions TSD 11-001, Potential Radionuclides of Concern during the Decommissioning of Zion Station (Reference 9) established the basis for an initial suite of potential ROC for the decommissioning of the Zion Nuclear Power Station (ZNPS).

LTP Chapter 2 provides detailed characterization data that described contamination levels in the basements. The survey data for this basement is based on core samples obtained at biased locations with elevated contact dose rates and/or evidence of leaks/spills and analyzed for the presence of plant-derived radionuclides.

ZionSolutions TSD 14-019, Radionuclides of Concern for Soil and Basement Fill Model Source Terms (Reference 10) evaluates the results of the concrete core analysis data from the Containments and Auxiliary Building and refines the initial suite of radionuclides potential ROC by evaluating the dose significance of each radionuclide.

LTP Chapter 6, section 6.5.2 discusses the process used to derive the ROC for the decommissioning of ZNPS, including the elimination of insignificant dose contributors (IC) from the initial suite. Table 7 presents the ROC for the Containment Basement structural surfaces and the normalized fractions based on the radionuclide mixture.

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 7 - Dose Significant Radionuclides and Mixture

% of Total Activity Radionuclide (normalized)(1)

H-3 0.075%

Co-60 4.72%

Cs-134 0.01%

Cs-137 68.17%

Ni-63 26.50%

Sr-90 0.05%

Eu-152 0.44%

Eu-154 0.06%

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

A fundamental precursor to survey design is to establish a relationship between the release criteria and some measurable quantity. This is done through the development of DCGLs.

The DCGLs represent average levels of radioactivity above background levels and are presented in terms of surface or mass activity concentrations. Chapter 6 of the LTP describes in detail the modeling used to develop the DCGLs for structures.

The End State Basements will be comprised of steel and/or concrete structures which will be covered by at least three feet of clean soil and physically altered to a condition which would not realistically allow the remaining structures, if excavated, to be occupied. The exposure pathways in the BFM are associated with residual radioactivity in floors and walls that is released through leaching into water contained in the interstitial spaces of the fill material. The BFM assumes that the inventory of residual radioactivity in a given building is released either instantly or over time by diffusion, depending on whether the activity is surficial or volumetric, respectively. The activity released into the fill water will adsorb onto the clean fill, as a function of the radionuclide-specific distribution coefficients, resulting in equilibrium concentrations between the fill and the water.

Consequently, the only potential exposure pathways after backfill, assuming the as-left geometry, are associated with the residual radioactivity in the water contained in the fill.

The final outputs of the BFM are the Basement Derived Concentration Guideline Levels (DCGL), in units of pCi/m2, which are calculated using the BFM Groundwater (GW) and BFM Drilling Spoils Dose Factors (LTP Chapter 6, Tables 6-24 and 6-25). DCGLs are calculated separately for the GW and Drilling Spoils scenarios and for the summation of both scenarios. The summation DCGL is designated as the Base Case DCGL and is used during FSS to demonstrate compliance (analogous to the DCGLW as defined in MARSSIM). The Base Case DCGLs are radionuclide-specific concentrations that

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 represent the 10 CFR 20.1402 dose criterion of 25 mrem/yr and are calculated for each ROC and each backfilled Basement.

When applied to structures, the DCGLs are expressed in units of activity per unit of area (pCi/m2). The unity rule is applied when there is more than one ROC. The measurement results for each singular ROC present in the mixture are compared against their respective DCGL to derive a dose fraction.

The Base Case DCGLs for the unrestricted release of the Containment Basement survey units are provided in Table 2. The IC dose percentage of 10% was used to adjust the Containment Basement DCGLs to account for the dose from the eliminated IC radionuclides.

Each radionuclide-specific Base Case DCGL 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 per year 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 Base Case DCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/year dose limit from each source term. The reduced DCGLs, or Operational DCGLs can be related to the Base Case DCGLs 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 Operational DCGL is then used as the DCGL for the FSS design of the survey unit (calculation of surrogate DCGLs, investigations levels, etc.). Details of the Operational DCGLs derived for each dose component and the basis for the applied a priori dose fractions are provided in TSD 17-004.

Table 8 - Base Case DCGLs for Containment Basements (BcDCGLB) from LTP Chapter 5, Table 5-3 Base Case DCGL Radionuclide (pCi/m2)

H-3 2.38E+08 Co-60 1.57E+08 Ni-63 4.02E+09 Sr-90 1.43E+06 Cs-134 3.01E+07 Cs-137 3.94E+07 Eu-152 3.66E+08 Eu-154 3.19E+08

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 The Operational DCGLs for the unrestricted release of the Containment Basement Survey Units #B1-01100AF and #B1-01110AF are provided in Table 9.

Table 9 - Operational DCGLs (OpDCGLB) for Containment Basements (pCi/m2) from LTP Chapter 5, Table 5-4 Radionuclide Above 565 ft. Under Vessel H-3 3.25E+07 2.37E+08 Co-60 2.15E+07 1.56E+08 Ni-63 5.50E+08 4.00E+09 Sr-90 1.96E+05 1.42E+06 Cs-134 4.12E+06 2.99E+07 Cs-137 5.39E+06 3.92E+07 Eu-152 5.00E+07 3.64E+08 Eu-154 4.36E+07 3.17E+08 As part of the DQOs applied to laboratory processes, analysis results were reported as actual calculated results. The actual recorded value was used as the recorded FSS result for measurement and/or sample values that are less than MDC. Negative values were recorded as zero. Results were not reported as less than MDC. Sample report summaries included unique sample identification, analytical method, radionuclide, result, uncertainty, laboratory data qualifiers, units, and the observed MDC.

Instrument DQOs included a verification of the ability of the survey instrument to detect the radiation(s) of interest relative to the Operational DCGL. The Canberra ISOCS was selected as the primary instrument used to perform FSS of basement surfaces. Response checks were required prior to issuance and after use. Control and accountability of ISOCS units was required to assure data quality.

In accordance with the LTP, for laboratory analysis, MDCs less than 10% of the Operational DCGL were preferable while MDCs up to 50% of the Operational DCGL were acceptable. The maximum acceptable MDC for measurements obtained using field instruments was 50 percent of the applicable Operational DCGL.

5. SURVEY DESIGN Guidance for preparing FSS plans was provided in procedure ZS-LT-300-001-001. The FSS plan uses an integrated sample design that combines scanning surveys and sampling which can be either random or judgmental.

[44]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 The Canberra ISOCS was selected as the primary instrument for performing FSS of basement surfaces. The ISOCS was selected as the instrument of choice to perform FSS of basement surfaces due to the fact that an ISOCS measurement will provide results that can be used directly to determine total activity with depth in concrete and, the surface area covered by a single ISOCS measurement is large (a nominal FOV of 10-30 m2) which essentially eliminates the need for a scan surveys. In addition, after an ISOCS measurement is collected, it can be tested against a variety of geometry assumptions to address uncertainty in the source term geometry if necessary.

The source term geometry for ISOCS efficiency calibration, i.e., concentration depth profile and areal distribution of the residual radioactivity in structures, is required to generate efficiency curves (i.e., efficiency as a function of energy) for the ISOCS gamma spectroscopy measurements. The concrete cores obtained during characterization, continuing characterization and FSS provided the requisite information regarding the distribution of activity with depth for the Under Vessel concrete. The source term geometry for the Containment above the 565 ft. elevation is 1/2 inch plate steel with no concrete. The basis for the chosen ISOCS efficiency calibrations for the FSS of the Under Vessel concrete and the steel liner above the 565 ft. elevation are documented in ZionSolutions TSD 14-022, Use of In-Situ Gamma Spectroscopy for Final Status Survey of End State Structures (Reference 11). For the FSS of the steel liner above the 565 ft.

elevation, a circular plane geometry with a 1/2 inch depth of contamination was selected as the default template. For the concrete in the Unit 1 Under Vessel area, an exponential circular plane geometry with a 17.8 cm depth of contamination and a relaxation length (DRL) of 8.6 cm was chosen as the default template. The basis for the selection of this geometry was the result of concrete core samples taken during continuing characterization which were analyzed for ROC concentration at depth in concrete.

In section 5.5.2.2 of the LTP, the number of ISOCS measurements required in each FSS unit was calculated as the quotient of the ISOCS FOV divided into the surface area required for areal coverage. Table 10, which is reproduced from LTP Table 5-18 (with correction to Class 1 for the above 565 foot elevation), presents the FSS units for the Unit 1 Containment, the classification based on contamination potential, the surface area to be surveyed and the minimum number of ISOCS measurements based on a measurement FOV of 28 m2.

[45]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 10 - Number of ISOCS Measurements per FSS Unit based on Areal Coverage Minimum # of Minimum Area ISOCS FSS Unit Classification Areal Coverage Measurements (m2) (% of Area) (FOV-28 m2)

Unit 1 Containment Basement Class 1 2,465 100% 88 above 565 foot elevation Unit 1 CTMT Under-Vessel Area Class 1 294 100% 11 To ensure that the number of ISOCS measurements based on the necessary areal coverage in a basement surface FSS unit was sufficient to satisfy a statistically based sample design, a calculation was performed and documented in LTP section 5.5.2.2 to determine sample size using the standard method as presented in MARSSIM. If the sample size based on the statistical design required more ISOCS measurements than the number of ISOCS measurement required by the areal coverage, then the number of ISOCS measurements was adjusted to meet the larger sample size.

Following MARSSIM guidance, the Type I and Type II decision errors were set at 0.05.

The upper boundary of the gray region was set at the Operational DCGLB. The Lower Bound of the Gray Region (LBGR) was set at the expected fraction of 50% of the Operational DCGLB. For the FSS unit in Unit 1 Containment above the 565 ft. elevation, the entire concrete source term above the 565 foot elevation was removed. Consequently, the results of the concrete core samples taken above the 565 ft. elevation in Unit 1 Containment were not representative of the conditions at the time of FSS. As reasonable value for sigma () cannot be determined based on existing survey data, a coefficient of variation of 30% was used in accordance with the guidance in MARSSIM, section 5.5.2.2.

For the Class 1 survey unit in the Containment Under-Vessel area, the standard deviation of the cores collected during characterization were used for sigma ().

The relative shift (/) was calculated as discussed in LTP section 5.6.4.1.6. The relative shift (/) was greater than three for the FSS unit above the 565 ft. elevation.

Consequently, a value of three was used as the adjusted relative shift (/). The relative shift (/) for the Under Vessel area was two. From Table 5-5 of MARSSIM, the required number of measurements (N) for use with the Sign Test, using a value of 0.05 for the Type I and Type II decision errors, is 14 measurements for a / value of three and 15 for a / value of 2. Consequently, the number of ISOCS measurements in the Under Vessel FSS unit was adjusted to meet the larger sample size.

As previously noted, the required areal coverage for a Class 1 basement survey unit is 100%. The LTP required that sufficient measurements be taken in a Class 1 FSS unit to ensure that 100% of the surface area was surveyed (ISOCS FOV overlapped to ensure that there were no un-surveyed corners and gaps). In cases where the physical configuration or

[46]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 measurement geometry makes the acquisition of a 28 m2 FOV difficult or prohibitive, then the FOV for the ISOCS measurement was reduced provided that the adjusted number of samples remained constant and the minimum areal coverage represented by the FSS unit classification was achieved. To ensure that were no un-surveyed corners and gaps, the number of measurements that were taken in both Unit 1 Containment Class 1 FSS units were adjusted by overlaying the center-point of the 28 m2 FOV for the ISOCS measurement on a 4m x 4m (16 m2) grid system. Table 11, which is reproduced from LTP Table 5-19, presents the Unit 1 Containment FSS units and the adjusted number of ISOCS measurements that will be taken in each survey unit.

Table 11 - Adjusted Minimum Number of ISOCS Measurements per FSS Unit Required Adjusted # of Adjusted Adjusted Areal ISOCS Areal Areal FSS Unit Classification Coverage Measurements Coverage Coverage (m2) (FOV-28 m2) (m2) (% of Area)

Unit 1 CTMT above Class 1 2,465 155(1) 2,465 100%

565 foot elevation Unit 1 CTMT Under-Class 1 294 19(1) 294 100%

Vessel Area (1) Adjusted to ensure number of measurements that will be taken in Class 1 FSS units will ensure 100% areal coverage, including overlap to ensure that there are no un-surveyed corners and gaps (FOV based on a 4m x 4m grid system).

When the survey grids were established on the 565 ft. elevation and in the Under Vessel area, obstacles and physical constraints were encountered that prompted further adjustments to the number of samples and the FOV. Some measurements were not feasible and other measurement locations were added. After adjustments to the survey design, a total of one hundred and sixty four (164) ISOCS measurements were taken above the 565 ft. elevation in Unit 1 Containment; sixty eight (68) on the lower wall and ninety six (96) on the floor (metal liner) and in the Cavity Flood Sump and the Recirculation Sump.

Nineteen (19) ISOCS shots were originally planned for the Under Vessel area (FSS unit

02110), based on a stand-off distance of 3-meters for the ISOCS detector. Additional measurements were required due to constraints caused by the limited space in the In-Core Tunnel Area, which increased the total number of ISOCS measurements necessary to achieve 100% areal coverage to sixty (60) ISOCS measurements.

The DQO process determined that H-3, Co-60, Ni-63, Sr-90, Cs-134, Cs-137, Eu-152 and Eu-154 would be the ROC in FSS Units #B1-02100 and #B1-02110. During FSS, concentrations for HTD ROC H-3, Ni-63 and Sr-90 were to be inferred using a surrogate approach. Cs-137 is the principle surrogate radionuclide for H-3 and 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 Containment Buildings were calculated in TSD 14-019 and are presented in LTP Table 5-

[47]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 15 and Table 12 below. The maximum ratios were to be used to infer HTD concentrations during FSS unless area specific ratios were determined.

Table 12 - Surrogate Ratios for Containment Containments Ratios Mean Max 95%UCL H-3/Cs-137 0.208 1.760 0.961 Ni-63/Co-60 30 442 193 Sr-90/Cs-137 0.002 0.021 0.010 For the FSS of Survey Units #B1-01100AF and #B1-01110AF, the surrogate Operational DCGLs for Co-60 and Cs-137 were computed based on the maximum ratios from Table 12.

The equation for calculating a surrogate DCGL is as follows:

Equation 1 1

=

1 2 3

+ + +

2 3 Where: DCGLSur = Surrogate radionuclide DCGL DCGL2,3n = DCGL for radionuclides to be represented by the surrogate Rn = Ratio of concentration (or nuclide mixture fraction) of radionuclide n to surrogate radionuclide Using the Operational DCGLs for Unit 1 Containment above the 565 ft. elevation presented in Table 9 and the maximum ratios from Table 12, the following surrogate calculations were performed for FSS unit #B1-01100AF; Equation 2 1

(137) = = 2.88 + 06 /2 1 0.021 1.760

+ +

5.39 + 06(137) 1.96 + 05(90) 3.25 + 07(3)

The surrogate Operational DCGL that was used for Cs-137 in FSS unit #B1-01100AF for direct comparison of sample results to demonstrate compliance is 2.88E+06 Ci/m2.

Equation 3 1

(60) = = 1.18 + 06 /2 1 442

+

2.15 + 07(60) 5.50 + 08(63)

[48]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 The surrogate Operational DCGL that was used for Co-60 in FSS unit #B1-01100AF for direct comparison of sample results to demonstrate compliance is 1.18E+06 Ci/m2.

Using the Operational DCGLs for Unit 1 Containment Under Vessel area presented in Table 9 and the maximum ratios from Table 12, the following surrogate calculations were performed for FSS unit #B1-01110AF; Equation 4 1

(137) = = 2.10 + 07 /2 1 0.021 1.760

+ +

3.92 + 07(137) 1.42 + 06(90) 2.37 + 08(3)

The surrogate Operational DCGL that was used for Cs-137 in FSS unit #B1-01110AF for direct comparison of sample results to demonstrate compliance is 2.10E+07 Ci/m2.

Equation 5 1

(60) = = 8.55 + 06 /2 1 442

+

1.56 + 08(60) 4.00 + 09(63)

The surrogate Operational DCGL that was used for Co-60 in FSS unit #B1-01110AF for direct comparison of sample results to demonstrate compliance is 8.55E+06 Ci/m2.

Previous sections of this report have discussed the commitment from LTP section 5.1 to acquire concrete core samples at 10% of the locations where an ISOCS measurement was collected with the locations selected at random. Only HTD radionuclides included as ROC (H-3, Ni-63, Sr-90, for Containment) were analyzed in the FSS confirmatory samples. For FSS unit #B1-01100AF which pertains to Unit 1 Containment above the 565 ft. elevation, no concrete media remains. Consequently, no confirmatory concrete core samples were required as part of the FSS survey design. For FSS unit #B1-01110AF which pertains to Unit 1 Containment Under Vessel area, 60 ISOCS measurements were required by the survey design. The survey design for the Under Vessel concrete required a minimum of 60 ISOCS measurements and consequently, five additional concrete core samples to meet the requirements of LTP section 5.1.

As previously discussed, in response to the results of the continuing characterization concrete core samples, it was acknowledged that the concrete surfaces that were represented by the continuing characterization concrete samples were remediated twice and the actual concrete that was sampled (original concrete surface to a depth of 1/2 inch) had been removed and disposed of as radioactive waste. At least a foot of concrete was removed from the Under Vessel floor and up to 6 inches of concrete removed from the walls. Consequently, an additional 19 concrete core samples were taken on March 7, 2018 as FSS confirmatory samples. The additional 19 concrete cores represented the as-left condition of the under-vessel concrete following concrete remediation.

[49]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 A 6 inch concrete core sample was acquired at each of the 19 concrete core locations. If a concrete core was previously obtained at the same location (continuing characterization),

then the second core (B group) was obtained directly adjacent. In addition, a concrete core was obtained at the center of the FOV of every ISOCS measurement acquired in the Under Vessel region (for a total of nine). The pucks representing the existing post remediation grade of the concrete to a depth of 1/2 inch for the 20 selected locations (see Figure 9) were sent to Eberline Laboratories for analysis results for Total Strontium, Tritium, Ni-63 and gamma spectroscopy.

Figure 9 - Unit 1 Containment FSS Confirmatory Concrete Core Sample Locations The analysis results for the twenty (19) concrete core pucks taken post remediation were received from Eberline and the results are presented in Table 13. Each sample or 1/2-inch puck represents the concrete from the existing grade to a depth of 1/2-inch. Each of the 1st 1/2-inch concrete pucks from each of the 19 concrete core samples were analyzed for all ROC, including the HTD ROC of H-3, Ni-63 and Sr-90. In accordance with LTP section 5.1, only samples with positive results (detectable concentrations greater than MDC) were assessed for HTD ratios.

[50]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 13 - FSS Confirmation Concrete Core Sample Analysis - Grade to 0.5 inch Depth Result Uncertainty MDC Ratios Sample ID Nuclide >MDC (pCi/g) (pCi/g) (pCi/g) Positive Only B1-01110F-IWC-001-CV H-3 8.80E+01 9.32E+00 1.24E+01 Y H-3/Cs-137 Ratio = 67.87 Co-60 7.28E+00 5.04E-01 3.36E-01 Y Ni-63 6.94E+00 1.06E+00 1.57E+00 Y Ni-63/Co-60 Ratio = 0.95 Sr-90 4.02E-01 2.84E-01 5.62E-01 N 1

Cs-134 -1.30E-01 2.17E-01 3.04E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 1.30E+00 4.00E-01 6.10E-01 Y (Sr-90 not positively identified)

Eu-152 9.10E+01 3.75E+00 1.36E+00 Y Eu-154 3.56E+00 6.24E-01 1.06E+00 Y B1-01110F-IWC-003-CV H-3 3.40E+01 7.53E+00 1.15E+01 Y H-3/Cs-137 Ratio = 0.66 Co-60 1.24E+01 1.22E+00 1.25E+00 Y Ni-63 2.45E+01 1.30E+00 1.47E+00 Y Ni-63/Co-60 Ratio = 1.97 Sr-90 7.87E-02 2.73E-01 5.75E-01 N 2

Cs-134 2.81E-01 4.45E-01 7.60E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 5.15E+01 5.36E+00 2.29E+00 Y (Sr-90 not positively identified)

Eu-152 1.29E+02 1.51E+01 3.28E+00 Y Eu-154 5.86E+00 4.52E+00 1.66E+00 Y B1-01110F-IWC-004-CV H-3 8.87E+01 8.82E+00 1.16E+01 Y H-3/Cs-137 Ratio = 1.91 Co-60 4.24E+00 3.29E-01 2.68E-01 Y Ni-63 1.76E+00 9.05E-01 1.48E+00 Y Ni-63/Co-60 Ratio = 0.42 Sr-90 3.23E-01 2.76E-01 5.53E-01 N 3

Cs-134 -4.97E-02 8.94E-02 2.71E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 4.65E+01 4.55E+00 6.60E-01 Y (Sr-90 not positively identified)

Eu-152 9.29E+01 3.67E+00 1.14E+00 Y Eu-154 4.21E+00 5.24E-01 5.75E-01 Y

[51]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 13 (continued) - FSS Confirmation Concrete Core Sample Analysis - Grade to 0.5 inch Depth Result Uncertainty MDC Ratios Sample ID Nuclide >MDC (pCi/g) (pCi/g) (pCi/g) Positive Only B1-01110F-IFC-005-CV H-3 1.21E+02 1.09E+01 1.39E+01 Y H-3/Cs-137 Ratio = N/A Co-60 6.48E-02 1.36E-01 9.66E-01 N (Cs-137 not positively identified)

Ni-63 5.11E-01 1.05E+00 1.78E+00 N Ni-63/Co-60 Ratio = N/A Sr-90 5.85E-02 2.89E-01 6.12E-01 N (Co-60/Ni-63 not positively identified) 4 Cs-134 3.51E-02 4.75E-01 7.28E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 1.29E-02 2.91E-01 8.52E-01 N (Cs-137/Sr-90 not positively identified)

Eu-152 9.04E+01 9.51E+00 2.37E+00 Y Eu-154 6.14E-02 2.59E-01 1.77E+00 N B1-01110F-IFC-006-CV H-3 1.09E+02 8.92E+00 1.11E+01 Y H-3/Cs-137 Ratio = 189.86 Co-60 3.42E+00 2.78E-01 2.79E-01 Y Ni-63 1.19E+00 7.31E-01 1.21E+00 N Ni-63/Co-60 Ratio = N/A Sr-90 2.17E-01 2.26E-01 4.59E-01 N (Ni-63 not positively identified) 5 Cs-134 5.29E-02 1.03E-01 2.39E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 5.76E-01 2.60E-01 4.13E-01 Y (Sr-90 not positively identified)

Eu-152 7.61E+01 3.05E+00 1.08E+00 Y Eu-154 2.74E+00 4.76E-01 5.45E-01 Y B1-01110F-IFC-008-CV H-3 2.29E+02 1.35E+01 1.48E+01 Y H-3/Cs-137 Ratio = 321.53 Co-60 7.72E+00 5.28E-01 3.62E-01 Y Ni-63 6.08E-01 1.25E+00 2.12E+00 N Ni-63/Co-60 Ratio = N/A Sr-90 2.86E-01 3.13E-01 6.37E-01 N (Ni-63 not positively identified) 6 Cs-134 -1.01E-02 1.65E-01 3.73E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 7.12E-01 2.94E-01 4.60E-01 Y (Sr-90 not positively identified)

Eu-152 1.37E+02 5.60E+00 1.82E+00 Y Eu-154 4.70E+00 7.70E-01 1.29E+00 Y

[52]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 13 (continued) - FSS Confirmation Concrete Core Sample Analysis - Grade to 0.5 inch Depth Result Uncertainty MDC Ratios Sample ID Nuclide >MDC (pCi/g) (pCi/g) (pCi/g) Positive Only B1-01110F-IWC-010-CV H-3 3.44E+01 9.90E+00 1.55E+01 Y H-3/Cs-137 Ratio = N/A Co-60 -5.32E-02 5.75E-02 4.68E-01 N (Cs-137 not positively identified)

Ni-63 7.01E-01 1.13E+00 1.90E+00 N Ni-63/Co-60 Ratio = N/A Sr-90 3.44E-01 3.26E-01 6.59E-01 N (Co-60/Ni-63 not positively identified) 7 Cs-134 -3.63E-02 1.17E-01 3.92E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 4.18E-02 1.20E-01 4.43E-01 N (Cs-137/Sr-90 not positively identified)

Eu-152 3.47E+01 3.67E+00 2.88E+00 Y Eu-154 1.00E+00 4.65E-01 8.36E-01 Y B1-01110F-IWC-011-CV H-3 1.30E+02 8.78E+00 1.02E+01 Y H-3/Cs-137 Ratio = 20.06 Co-60 5.52E+00 6.46E-01 8.29E-01 Y Ni-63 3.98E+00 1.00E+00 1.57E+00 Y Ni-63/Co-60 Ratio = 0.72 Sr-90 2.98E-01 2.91E-01 5.88E-01 N 8

Cs-134 -1.36E-01 3.88E-01 5.85E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 6.47E+00 9.54E-01 1.05E+00 Y (Sr-90 not positively identified)

Eu-152 9.46E+01 7.35E+00 2.97E+00 Y Eu-154 4.28E+00 8.78E-01 1.51E+00 Y B1-01110F-IWC-018-CV H-3 1.37E+03 2.58E+01 1.39E+01 Y H-3/Cs-137 Ratio = 1231.02 Co-60 2.53E+01 1.55E+00 7.63E-01 Y Ni-63 2.86E+00 1.16E+00 1.89E+00 Y Ni-63/Co-60 Ratio = 0.11 Sr-90 2.08E-01 3.13E-01 6.46E-01 N 9

Cs-134 -6.36E-02 3.91E-01 6.30E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 1.11E+00 5.37E-01 8.70E-01 Y (Sr-90 not positively identified)

Eu-152 4.49E+02 1.79E+01 4.41E+00 Y Eu-154 2.02E+01 2.05E+00 2.34E+00 Y

[53]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 13 (continued) - FSS Confirmation Concrete Core Sample Analysis - Grade to 0.5 inch Depth Result Uncertainty MDC Ratios Sample ID Nuclide >MDC (pCi/g) (pCi/g) (pCi/g) Positive Only B1-01110F-IWC-019-CV H-3 3.01E+03 3.63E+01 1.32E+01 Y H-3/Cs-137 Ratio = N/A Co-60 1.97E+02 1.14E+01 1.98E+00 Y (Cs-137 not positively identified)

Ni-63 4.10E+01 2.12E+00 2.38E+00 Y Ni-63/Co-60 Ratio = 0.21 Sr-90 9.11E-01 3.73E-01 6.93E-01 Y 10 Cs-134 8.33E-02 1.11E+00 1.75E+00 N Sr-90/Cs-137 Ratio = N/A Cs-137 -2.15E-01 1.54E+00 2.48E+00 N (Cs-137 not positively identified)

Eu-152 2.90E+03 1.08E+02 7.70E+00 Y Eu-154 8.74E+01 9.83E+00 3.90E+00 Y B1-01110IF-IFC-003-CV H-3 1.59E+02 9.84E+00 1.10E+01 Y H-3/Cs-137 Ratio = 177.69 Co-60 5.50E+00 4.58E-01 4.29E-01 Y Ni-63 -8.97E-02 1.33E+00 2.28E+00 N Ni-63/Co-60 Ratio = N/A Sr-90 9.64E-01 3.83E-01 7.10E-01 Y (Ni-63 not positively identified) 11 Cs-134 -3.58E-01 2.52E-01 5.53E-01 N Sr-90/Cs-137 Ratio = 1.07 Cs-137 8.98E-01 4.61E-01 6.72E-01 Y Eu-152 1.03E+02 7.66E+00 2.89E+00 Y Eu-154 3.39E+00 7.78E-01 1.32E+00 Y B1-01110IF-IWC-014-CV H-3 5.95E+02 1.48E+01 9.73E+00 Y H-3/Cs-137 Ratio = N/A Co-60 1.46E+01 9.82E-01 6.42E-01 Y (Cs-137 not positively identified)

Ni-63 5.22E-01 7.15E-01 1.20E+00 N Ni-63/Co-60 Ratio = N/A Sr-90 1.86E-01 2.34E-01 4.81E-01 N (Ni-63 not positively identified) 12 Cs-134 -2.70E-01 5.95E-01 7.77E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 3.73E-01 7.10E-01 9.50E-01 N (Sr-90/Cs-137 not positively identified)

Eu-152 2.77E+02 1.29E+01 2.65E+00 Y Eu-154 1.12E+01 1.67E+00 1.34E+00 Y

[54]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 13 (continued) - FSS Confirmation Concrete Core Sample Analysis - Grade to 0.5 inch Depth Result Uncertainty MDC Ratios Sample ID Nuclide >MDC (pCi/g) (pCi/g) (pCi/g) Positive Only B1-01110IF-IWC-015-CV H-3 8.09E+01 7.42E+00 9.50E+00 Y H-3/Cs-137 Ratio = 18.20 Co-60 6.71E+00 4.87E-01 4.18E-01 Y Ni-63 2.12E+00 1.13E+00 1.86E+00 Y Ni-63/Co-60 Ratio = 0.32 Sr-90 5.47E-01 3.57E-01 7.04E-01 N 13 Cs-134 -9.13E-02 2.57E-01 3.61E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 3.02E+00 5.73E-01 7.46E-01 Y (Sr-90 not positively identified)

Eu-152 1.08E+02 4.45E+00 1.82E+00 Y Eu-154 4.45E+00 7.55E-01 1.29E+00 Y B1-01110IF-IWC-016-CV H-3 2.19E+02 1.25E+01 1.34E+01 Y H-3/Cs-137 Ratio = N/A Co-60 8.76E+00 6.12E-01 3.96E-01 Y (Cs-137 not positively identified)

Ni-63 3.77E-01 1.13E+00 1.92E+00 N Ni-63/Co-60 Ratio = N/A Sr-90 9.83E-02 3.43E-01 7.22E-01 N (Ni-63 not positively identified) 14 Cs-134 -5.77E-02 2.39E-01 3.77E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 2.94E-01 3.64E-01 5.39E-01 N (Sr-90/Cs-137 not positively identified)

Eu-152 1.65E+02 6.39E+00 1.68E+00 Y Eu-154 5.79E+00 8.33E-01 8.49E-01 Y B1-01110IF-IWC-017-CV H-3 1.17E+02 1.03E+01 1.30E+01 Y H-3/Cs-137 Ratio = N/A Co-60 5.66E+00 4.74E-01 3.91E-01 Y (Cs-137 not positively identified)

Ni-63 2.08E+00 7.63E-01 1.23E+00 Y Ni-63/Co-60 Ratio = 0.37 Sr-90 2.21E-01 2.22E-01 4.50E-01 N 15 Cs-134 -1.07E-01 3.70E-01 4.86E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 2.01E-01 4.32E-01 5.86E-01 N (Sr-90/Cs-137 not positively identified)

Eu-152 9.37E+01 4.81E+00 1.82E+00 Y Eu-154 6.88E+00 1.86E+00 9.21E-01 Y

[55]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 13 (continued) - FSS Confirmation Concrete Core Sample Analysis - Grade to 0.5 inch Depth Result Uncertainty MDC Ratios Sample ID Nuclide >MDC (pCi/g) (pCi/g) (pCi/g) Positive Only B1-01110IF-IWC-018-CV H-3 1.94E+02 1.17E+01 1.29E+01 Y H-3/Cs-137 Ratio = N/A Co-60 1.13E+01 7.89E-01 5.64E-01 Y (Cs-137 not positively identified)

Ni-63 6.83E-01 8.60E-01 1.45E+00 N Ni-63/Co-60 Ratio = N/A Sr-90 1.37E-01 2.69E-01 5.60E-01 N (Ni-63 not positively identified) 16 Cs-134 -1.02E-02 2.38E-01 5.29E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 1.46E-02 4.55E-01 6.58E-01 N (Sr-90/Cs-137 not positively identified)

Eu-152 2.29E+02 9.28E+00 2.58E+00 Y Eu-154 7.73E+00 1.15E+00 1.84E+00 Y B1-01110IF-IWC-019-CV H-3 7.95E+01 8.50E+00 1.13E+01 Y H-3/Cs-137 Ratio = 17.37 Co-60 7.94E+00 5.25E-01 2.66E-01 Y Ni-63 4.75E+01 1.40E+00 1.22E+00 Y Ni-63/Co-60 Ratio = 5.98 Sr-90 2.82E-01 2.03E-01 4.02E-01 N 17 Cs-134 7.59E-02 1.39E-01 2.64E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 3.03E+01 2.98E+00 5.71E-01 Y (Sr-90 not positively identified)

Eu-152 9.65E+01 3.80E+00 1.22E+00 Y Eu-154 4.58E+00 5.36E-01 6.18E-01 Y B1-01110IF-IWC-020-CV H-3 1.55E+02 9.61E+00 1.07E+01 Y H-3/Cs-137 Ratio = N/A Co-60 1.38E+01 9.34E-01 5.20E-01 Y (Cs-137 not positively identified)

Ni-63 2.84E+01 1.36E+00 1.51E+00 Y Ni-63/Co-60 Ratio = 2.06 Sr-90 7.04E-01 2.76E-01 5.13E-01 Y 18 Cs-134 -8.37E-03 1.98E-01 4.41E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 4.28E-01 3.68E-01 6.09E-01 N (Sr-90/Cs-137 not positively identified)

Eu-152 1.32E+02 5.47E+00 2.07E+00 Y Eu-154 4.00E+00 8.00E-01 1.40E+00 Y

[56]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 13 (continued) - FSS Confirmation Concrete Core Sample Analysis - Grade to 0.5 inch Depth Result Uncertainty MDC Ratios Sample ID Nuclide >MDC (pCi/g) (pCi/g) (pCi/g) Positive Only B1-01110IF-IFC-021-CV H-3 1.53E+02 1.25E+01 1.54E+01 Y H-3/Cs-137 Ratio = N/A Co-60 8.85E+00 5.76E-01 2.83E-01 Y (Cs-137 not positively identified)

Ni-63 4.79E-01 8.00E-01 1.35E+00 N Ni-63/Co-60 Ratio = N/A Sr-90 2.99E-02 2.26E-01 4.80E-01 N (Ni-63 not positively identified) 19 Cs-134 3.89E-02 1.25E-01 2.38E-01 N Sr-90/Cs-137 Ratio = N/A Cs-137 1.95E-03 2.35E-01 3.42E-01 N (Sr-90/Cs-137 not positively identified)

Eu-152 8.14E+01 3.22E+00 1.04E+00 Y Eu-154 2.81E+00 4.45E-01 5.25E-01 Y

[57]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 14 - FSS Confirmation Concrete Core Sample Analysis - Concentrations at Depth B1-01110F-IWC-003-CV H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 Depth (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g)

Surface to 0.5 inch 3.40E+01 1.24E+01 2.45E+01 7.87E-02 2.81E-01 5.15E+01 1.29E+02 5.86E+00 0.5 to 1 inch 1.32E+01 9.12E+00 3.05E+01 5.58E-01 6.13E-01 1.25E+01 1.52E+02 5.37E+00 1 to 1.5 inch 2.40E+01 6.76E+00 1.45E+01 8.26E-01 -4.64E-01 1.74E+00 1.16E+02 5.12E+00 1.5 to 2 inch 2.87E+01 5.76E+00 1.76E+01 4.04E-01 -6.50E-01 5.31E-01 1.09E+02 3.33E+00 2 to 2.5 inch 3.24E+01 6.30E+00 3.84E+00 7.48E-01 1.78E-01 2.68E-01 1.17E+02 4.52E+00 2.5 to 3 inch 3.48E+01 4.82E+00 2.24E+00 1.55E-02 5.33E-01 1.21E+00 9.72E+01 3.89E+00 3 to 3.5 inch 4.19E+01 6.09E+00 1.81E+00 5.02E-01 -1.32E+00 6.77E-01 1.04E+02 5.78E+00 3.5 to 4 inch 3.09E+01 3.93E+00 -1.36E+00 1.66E-01 6.64E-03 -1.77E-01 8.11E+01 3.22E+00 4 to 4.5 inch 2.50E+01 3.41E+00 3.47E-01 1.05E+00 -2.18E-02 2.51E-01 7.39E+01 2.77E+00 4.5 to 5 inch 1.52E+01 2.63E+00 8.42E-02 4.55E-01 -2.36E-04 -1.44E-01 5.63E+01 1.60E+00 5 to 5.5 inch 1.71E+01 3.12E+00 1.32E+00 8.11E-01 -2.98E-01 -2.09E-01 5.86E+01 1.17E+00 5.5 to 6 inch 2.95E+01 2.18E+00 1.76E+00 4.62E-01 -2.22E-02 2.08E-01 4.16E+01 1.61E+00 B1-01110F-IWC-011-CV H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 Depth (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g)

Surface to 0.5 inch 1.30E+02 5.52E+00 3.98E+00 2.98E-01 -1.36E-01 6.47E+00 9.46E+01 4.28E+00 0.5 to 1 inch 3.44E+01 7.37E+00 1.76E+00 8.68E-01 -9.56E-02 -2.35E-01 1.19E+02 5.24E+00 1 to 1.5 inch 3.16E+01 9.75E+00 4.03E+00 1.70E-01 6.85E-03 -1.45E-01 1.30E+02 5.71E+00 1.5 to 2 inch 3.10E+01 5.26E+00 2.50E+00 4.30E-01 4.54E-01 1.41E-01 1.12E+02 5.98E+00 2 to 2.5 inch 3.37E+01 6.60E+00 7.03E-01 1.12E-01 5.34E-02 -1.05E-01 1.10E+02 4.95E+00 2.5 to 3 inch 2.02E+01 6.20E+00 4.14E-01 4.07E-01 -5.49E-02 -2.07E-02 1.02E+02 1.28E-01 3 to 3.5 inch 1.82E+01 4.01E+00 2.27E+00 5.87E-01 -6.57E-02 -1.62E-01 7.51E+01 2.71E+00 3.5 to 4 inch 3.43E+01 4.44E+00 1.35E+00 -5.78E-01 1.60E-02 -2.80E-02 7.44E+01 2.42E+00 4 to 4.5 inch 2.71E+01 4.59E+00 1.75E+00 1.03E-01 -7.28E-01 4.40E-01 6.89E+01 2.49E+00 4.5 to 5 inch 1.65E+01 3.18E+00 1.22E+00 7.06E-01 4.51E-02 4.36E-01 6.57E+01 1.76E+00

[58]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 14 (continued) - FSS Confirmation Concrete Core Sample Analysis - Concentrations at Depth B1-01110IF-IWC-014-CV H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 Depth (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g)

Surface to 0.5 inch 5.95E+02 1.46E+01 5.22E-01 1.86E-01 -2.70E-01 3.73E-01 2.77E+02 1.12E+01 0.5 to 1 inch 6.95E+01 1.32E+01 2.13E+00 3.40E-01 -8.53E-01 -8.62E-01 2.45E+02 1.04E+01 1 to 1.5 inch 5.74E+01 1.06E+01 1.77E+00 2.63E-01 7.85E-02 -2.36E-01 2.22E+02 7.61E+00 1.5 to 2 inch 5.74E+01 1.75E+01 3.51E+00 2.72E-01 -1.88E-01 2.39E-03 1.94E+02 6.29E+00 2 to 2.5 inch 5.28E+01 7.67E+00 3.08E+00 3.67E-01 -1.90E-01 8.20E-02 1.59E+02 5.17E+00 2.5 to 3 inch 3.94E+01 4.96E+00 3.18E+00 2.81E-02 8.37E-02 2.02E-01 7.47E+01 2.22E+00 3 to 3.5 inch 2.17E+01 6.07E+00 2.37E+00 6.82E-01 -1.03E-01 3.79E-04 1.25E+02 4.80E+00 3.5 to 4 inch 2.41E+01 4.01E+00 2.30E+00 8.68E-02 -4.23E-01 -8.52E-02 8.00E+01 2.60E+00 4 to 4.5 inch 1.96E+01 4.09E+00 8.28E+00 6.62E-01 6.85E-02 -4.23E-02 7.06E+01 2.21E+00 4.5 to 5 inch 5.07E+01 2.50E+00 2.07E+00 9.28E-01 7.27E-02 -5.86E-02 5.29E+01 2.88E+00 5 to 5.5 inch 4.15E+01 2.30E+00 2.77E+00 5.58E-01 1.01E-02 2.88E-01 4.33E+01 1.32E+00 B1-01110F-IWC-018-CV H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 Depth (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g)

Surface to 0.5 inch 1.37E+03 2.53E+01 2.86E+00 2.08E-01 -6.36E-02 1.11E+00 4.49E+02 2.02E+01 0.5 to 1 inch 2.39E+02 2.57E+01 1.40E+01 1.06E+00 -5.92E-01 5.95E-01 4.80E+02 1.84E+01 1 to 1.5 inch 1.76E+02 4.84E+01 7.87E+00 9.84E-01 -1.27E-01 -5.61E-01 5.24E+02 2.04E+01 1.5 to 2 inch 3.18E+02 4.21E+01 1.05E+01 4.75E-01 -6.13E-02 2.15E-01 5.58E+02 2.35E+01 2 to 2.5 inch 2.49E+02 3.96E+01 3.14E+00 1.69E+00 6.10E-01 3.05E-01 5.40E+02 1.78E+01 2.5 to 3 inch 2.83E+02 3.44E+01 4.73E+00 1.17E+00 -5.59E-02 -3.95E-01 4.94E+02 1.81E+01 3 to 3.5 inch 3.43E+02 2.07E+01 8.92E+00 1.04E+00 -3.18E-02 8.39E-01 4.09E+02 -1.92E-01 3.5 to 4 inch 3.12E+02 1.62E+01 6.51E+00 5.56E-01 -4.21E-01 -7.80E-01 3.76E+02 1.34E+01 4 to 4.5 inch 2.75E+02 1.28E+01 5.49E+00 5.81E-01 6.37E-02 -1.99E-01 2.69E+02 7.56E+00

[59]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 14 (continued) - FSS Confirmation Concrete Core Sample Analysis - Concentrations at Depth B1-01110F-IWC-019-CV H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 Depth (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g)

Surface to 0.5 inch 3.01E+03 1.97E+02 4.10E+01 9.11E-01 8.33E-02 -2.15E-01 2.90E+03 8.74E+01 0.5 to 1 inch 1.65E+03 1.20E+02 1.78E+01 4.29E-01 7.78E-01 2.21E+00 2.26E+03 7.28E+01 1 to 1.5 inch 1.49E+03 9.88E+01 2.64E+01 3.48E-01 -1.92E-01 1.06E+00 1.84E+03 5.45E+01 1.5 to 2 inch 1.45E+03 7.96E+01 2.55E+01 4.70E-01 -4.14E-01 -5.82E-02 1.54E+03 4.76E+01 2 to 2.5 inch 8.60E+02 8.28E+01 8.28E+00 1.33E-01 1.08E-01 3.85E-01 1.37E+03 4.06E+01 2.5 to 3 inch 1.02E+03 6.10E+01 1.85E+01 1.75E-02 -4.96E-01 2.23E-02 1.14E+03 3.83E+01 3 to 3.5 inch 1.18E+03 5.53E+01 1.15E+01 9.96E-02 -8.05E-01 -4.25E-02 8.81E+02 2.37E+01 3.5 to 4 inch 9.36E+02 5.53E+01 3.21E+01 2.04E-01 -2.86E-01 -2.03E-01 9.13E+02 2.94E+01 4 to 4.5 inch 6.13E+02 3.90E+01 1.08E+01 9.24E-01 6.15E-02 9.77E-01 7.13E+02 1.78E+01 4.5 to 5 inch 5.58E+02 3.50E+01 3.30E+00 3.52E-01 -1.48E+00 -6.13E-01 1.95E+01 8.77E+00 5 to 5.5 inch 4.39E+02 3.65E+00 7.41E+00 -6.72E-02 -5.25E-02 -5.99E-01 9.95E+01 2.89E+00 5.5 to 6 inch 3.63E+02 1.64E+01 6.50E+00 3.40E-01 -9.64E-01 1.06E+00 3.57E+02 7.76E+00

[60]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 In accordance with the process described in LTP section 5.1, the HTD to surrogate ratio was derived for concrete cores with positive results for both a HTD ROC and the corresponding surrogate radionuclide (Cs-137 or Co-60). The HTD ratios from the analysis of the 1st 1/2-inch of the 19 FSS confirmatory concrete cores are presented in Table 15.

Table 15 - FSS Confirmation Concrete Core Sample Analysis Surrogate Ratios Containment Ratios Mean Max 95%UCL H-3/Cs-137 1605 13,324 8873 Ni-63/Co-60 1.24 7.89 5.62 Sr-90/Cs-137 1.59 9.43 7.28 A review of the post remediation concrete core data indicates that almost all of the ratios to Cs-137 for H-3 exceeds 1.76 and almost all the positive results for Sr-90 exceeds 0.021, both representing the maximum ratios from LTP section 5.2.11, Table 5-15. A review of the pre-remediation results (Table 4) and the post remediation results (Table 13 and Table

14) clearly show that the cause can be attributed to the fact that the majority of the less soluble source term activity for Cs-137 was contained with the near surface concrete that was remediated and removed (within a minimum of 6 inches) while the more soluble ROC (H-3 and Sr-90), while present in lesser concentrations than present in the pre-remediated concrete, have become the dominant radionuclide in the relationship with Cs-137. Due to the significant reduction in the concentrations of the gamma emitting ROC (many at MDC), the H-3 and Sr-90 concentrations are not well correlated with Cs-137 and the use of a ratio with Cs-137 to infer a concentration for the HTD is no longer defensible.

LTP Chapter 5, section 5.1 states. Survey unit-specific surrogate ratios, in lieu of the maximum ratios from section 5.2.11 Table 5-15, may be used for compliance if sufficient radiological data exists to demonstrate that a different ratio is representative for the given survey unit. In these cases, the survey unit-specific radiological data and the derived surrogate ratios will be submitted to the NRC for approval. If approved, then the survey unit-specific ratios used and the survey data serving as the basis for the surrogate ratios will be documented in the release record for the survey unit. Accordingly, ZSRP submitted a document to the NRC titled Request for Regulatory Approval for Area Specific Hard to Detect (HTD) Approach for the Zion Nuclear Station Unit 1 Containment Under Vessel Area on April 10, 2018. While this document was specific to Unit 1 Containment, the situation and the proposed process were applicable to both Unit 1 and Unit 2 Containments. In this document, ZSRP presented evidence that the use of surrogate ratios to infer concentrations of HTD ROC in the Under Vessel concrete was no longer defensible. ZSRP proposed an alternate approach to use the actual measured

[61]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 concentration of each HTD ROC to derive HTD concentrations for demonstrating compliance in the end-state concrete.

In the document, ZSRP stated that a sufficient number (19) of post remediation concrete core samples were taken on the Under Vessel concrete to demonstrate compliance based on actual analysis results. As previously stated, of the nineteen (19) samples taken, nine (9) were taken directly at the center-point of the FOV of the ISOCS FSS measurement.

The other ten (10) were taken adjacent to continuing characterization concrete core To ensure that the measured values were in fact limiting, the following calculations were performed to assess the dose consequence of the inventory of each HTD in the Under Vessel concrete if present at the measured concentration. The measurements and dimensions presented in Table 16 (which were taken from ZionSolutions TSD 13-005, Unit 1 and Unit 2 Reactor Building Estimated End State Concrete and Liner Volumes and Surfaces Areas [Reference 12]) were used to quantify the volume of concrete in the Unit 1 Containment Under Vessel area.

Table 16 - Unit 1 Containment Under Vessel Concrete Area, Volume and Dimensions Total Surface Total Length Width Thickness Volume Surface Section Area Number Volume Area (in) (in) (in) (ft2) (ft3) (ft2) (ft3)

Sloped Tunnel Floor 320 90 15 200 250 1 200 250 Sloped Tunnel Ceiling 168 90 15 105 131 1 105 131 Sloped Tunnel Walls 319.9 94 15 209 344 2 418 688 Tunnel Ceiling 196 90 15 123 153 1 123 153 Sump Area Floor 87 90 30 70 128 1 70 128 Sump Area Walls 87 123 15 74 127 2 149 254 Fan Shaped Floor 179.5 126 30 157 393 1 157 393 Fan Shaped Walls 157 123 15 134 229 2 268 458 Under Vessel Floor N/A 102.5 30 229 573 1 229 573 Under Vessel Walls 348 102.5 23.5 1443 3150 1 1443 3150 3161 ft2 6178 ft3 2

294 m 175 m3 1.75E+08 cm3 For the assessment, the concrete thickness was reduced by 20% to account for the volume of concrete removed during remediation. The concentrations in units of pCi/g were multiplied by the affected mass of concrete in units of grams resulting in the actual inventory of each measured HTD ROC in units of mCi. The dose consequence was derived using the dose factors from LTP Chapter 6, Tables 6-19 and 6-20. The dose bounding calculations for each HTD ROC based on the measured concentrations of each HTD ROC from the 1st 1/2-inch puck from each of the 19 FSS confirmatory concrete core samples are presented in Table 17.

[62]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 17 - Unit 1 Containment Under Vessel Concrete HTD Inventory and Dose Based on FSS Confirmatory Core Samples Concrete Representative Concrete Concrete Result Activity Dose Sample ID Description of Location Nuclide Thickness Area Volume Mass (pCi/g) (cm) (cm2) (cm3) (g) (mCi) (mrem/yr)

B1-01110F-IWC-001-CV Lower Under Vessel wall adj to tunnel H-3 8.80E+01 59.69 1.00E+05 5.97E+06 1.40E+07 1.2337 0.03 B1-01110F-IWC-003-CV Lower Under Vessel wall adj to tunnel H-3 3.40E+01 59.69 1.00E+05 5.97E+06 1.40E+07 0.4766 0.01 B1-01110F-IWC-004-CV Lower Under Vessel wall adj to tunnel H-3 8.87E+01 59.69 1.00E+05 5.97E+06 1.40E+07 1.2443 0.03 B1-01110F-IFC-005-CV Under Vessel Floor @ tunnel H-3 1.21E+02 76.2 4.00E+04 3.05E+06 7.16E+06 0.8666 0.02 B1-01110F-IFC-006-CV Under Vessel Floor center-point H-3 1.09E+02 76.2 4.00E+04 3.05E+06 7.16E+06 0.7830 0.02 B1-01110F-IFC-008-CV Under Vessel Floor north H-3 2.29E+02 76.2 4.00E+04 3.05E+06 7.16E+06 1.6390 0.04 B1-01110F-IWC-010-CV Mid Under Vessel wall west H-3 3.44E+01 59.69 1.00E+05 5.97E+06 1.40E+07 0.4832 0.01 B1-01110F-IWC-011-CV Mid Under Vessel wall north H-3 1.30E+02 59.69 1.00E+05 5.97E+06 1.40E+07 1.8195 0.05 B1-01110F-IWC-018-CV Mid Under Vessel wall east H-3 1.37E+03 59.69 1.00E+05 5.97E+06 1.40E+07 19.1820 0.52 B1-01110F-IWC-019-CV Upper Under Vessel east H-3 3.01E+03 59.69 1.00E+05 5.97E+06 1.40E+07 42.1547 1.15 B1-01110IF-IFC-003-CV Under Vessel Floor center-point H-3 1.59E+02 76.2 4.00E+04 3.05E+06 7.16E+06 1.1423 0.03 B1-01110IF-IWC-014-CV Mid Under Vessel wall north H-3 5.95E+02 59.69 1.00E+05 5.97E+06 1.40E+07 8.3402 0.23 B1-01110IF-IWC-015-CV Lower Under Vessel wall adj to tunnel H-3 8.09E+01 59.69 1.00E+05 5.97E+06 1.40E+07 1.1351 0.03 B1-01110IF-IWC-016-CV Mid Under Vessel wall west H-3 2.19E+02 59.69 1.00E+05 5.97E+06 1.40E+07 3.0765 0.08 B1-01110IF-IWC-017-CV Lower Under Vessel wall midpoint H-3 1.17E+02 59.69 1.00E+05 5.97E+06 1.40E+07 1.6438 0.04 B1-01110IF-IWC-018-CV Upper Under Vessel east H-3 1.94E+02 59.69 1.00E+05 5.97E+06 1.40E+07 2.7242 0.07 B1-01110IF-IWC-019-CV Lower Under Vessel wall adj to tunnel H-3 7.95E+01 59.69 1.00E+05 5.97E+06 1.40E+07 1.1151 0.03 B1-01110IF-IWC-020-CV Mid Under Vessel wall east H-3 1.55E+02 59.69 1.00E+05 5.97E+06 1.40E+07 2.1750 0.06 B1-01110IF-IFC-021-CV Under Vessel Floor @ tunnel H-3 1.53E+02 76.2 4.00E+04 3.05E+06 7.16E+06 1.0973 0.03 Avg of 001, 004 and 021 Tunnel H-3 1.10E+02 57 1.34E+06 7.64E+07 1.79E+08 19.7357 0.54 Constants Total H-3 Activity Inventory in Under Vessel Concrete 112.0678 mCi Concrete Density = 2.35 g/cm3 H-3 Dose Factor (2) = 3.02E-02 mrem/yr per mCi Total Dose from H-3 Inventory in Concrete 3.05 mrem/yr Conversion Factor = 1.00E-09 mCi/pCi Notes No concrete cores were taken in the tunnel. Result for H-3 concentration in Tunnel is the average of the concrete cores taken closest to and adjacent to the Tunnel (1) opening. These cores included 001, 003, 004, 011, 018, 019 and 021 The Dose Factor for H-3 is the sum of the Dose Factor for Groundwater from LTP Chapter 6, Table 6-19 and the Dose Factor for Drilling Spoils from LTP Chapter 6, (2)

Table 6-20. The value was then adjusted by dividing by 0.9 to account for the Insignificant Contributor Dose Adjustment Factor

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 17 (continued) - Unit 1 Containment Under Vessel Concrete HTD Inventory and Dose Based on FSS Confirmatory Core Samples Concrete Representative Concrete Concrete Result Activity Dose Sample ID Description of Location Nuclide Thickness Area Volume Mass (pCi/g) (cm) (cm2) (cm3) (g) (mCi) (mrem/yr)

B1-01110F-IWC-001-CV Lower Under Vessel wall adj to tunnel Ni-63 6.94E+00 47.752 9.57E+04 4.57E+06 1.07E+07 0.0745 0.0745 B1-01110F-IWC-003-CV Lower Under Vessel wall adj to tunnel Ni-63 2.45E+01 47.752 9.57E+04 4.57E+06 1.07E+07 0.2635 0.2635 B1-01110F-IWC-004-CV Lower Under Vessel wall adj to tunnel Ni-63 1.76E+00 47.752 9.57E+04 4.57E+06 1.07E+07 0.0189 0.0189 B1-01110F-IFC-005-CV Under Vessel Floor @ tunnel Ni-63 5.11E-01 60.96 4.26E+04 2.60E+06 6.10E+06 0.0031 0.0031 B1-01110F-IFC-006-CV Under Vessel Floor center-point Ni-63 1.19E+00 60.96 4.26E+04 2.60E+06 6.10E+06 0.0072 0.0072 B1-01110F-IFC-008-CV Under Vessel Floor north Ni-63 6.08E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0065 0.0065 B1-01110F-IWC-010-CV Mid Under Vessel wall west Ni-63 7.01E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0075 0.0075 B1-01110F-IWC-011-CV Mid Under Vessel wall north Ni-63 3.98E+00 47.752 9.57E+04 4.57E+06 1.07E+07 0.0428 0.0428 B1-01110F-IWC-018-CV Mid Under Vessel wall east Ni-63 2.86E+00 47.752 9.57E+04 4.57E+06 1.07E+07 0.0307 0.0307 B1-01110F-IWC-019-CV Upper Under Vessel east Ni-63 4.10E+01 47.752 9.57E+04 4.57E+06 1.07E+07 0.4403 0.4403 B1-01110IF-IFC-003-CV Under Vessel Floor center-point Ni-63 2.28E+00 47.752 9.57E+04 4.57E+06 1.07E+07 0.0245 0.0245 B1-01110IF-IWC-014-CV Mid Under Vessel wall north Ni-63 5.22E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0056 0.0056 B1-01110IF-IWC-015-CV Lower Under Vessel wall adj to tunnel Ni-63 2.12E+00 47.752 9.57E+04 4.57E+06 1.07E+07 0.0228 0.0228 B1-01110IF-IWC-016-CV Mid Under Vessel wall west Ni-63 3.77E-01 60.96 4.26E+04 2.60E+06 6.10E+06 0.0023 0.0023 B1-01110IF-IWC-017-CV Lower Under Vessel wall midpoint Ni-63 2.08E+00 60.96 4.26E+04 2.60E+06 6.10E+06 0.0127 0.0127 B1-01110IF-IWC-018-CV Upper Under Vessel east Ni-63 6.83E-01 60.96 4.26E+04 2.60E+06 6.10E+06 0.0042 0.0042 B1-01110IF-IWC-019-CV Lower Under Vessel wall adj to tunnel Ni-63 4.75E+01 47.752 9.57E+04 4.57E+06 1.07E+07 0.5103 0.5103 B1-01110IF-IWC-020-CV Mid Under Vessel wall east Ni-63 2.84E+01 47.752 9.57E+04 4.57E+06 1.07E+07 0.3045 0.3045 B1-01110IF-IFC-021-CV Under Vessel Floor @ tunnel Ni-63 4.79E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0051 0.0051 Avg of 001, 004 and 021 Tunnel Ni-63 3.06E+00 47.752 1.39E+06 6.62E+07 1.56E+08 0.4763 0.4763 Constants Total H-3 Activity Inventory in Under Vessel Concrete 2.2635 mCi Concrete Density = 2.35 g/cm3 Ni-63 Dose Factor (2) = 1.79E-02 mrem/yr per mCi Total Dose from H-3 Inventory in Concrete 0.0040 mrem/yr Conversion Factor = 1.00E-09 mCi/pCi Notes No concrete cores were taken in the tunnel. Result for Ni-63 concentration in Tunnel is the average of the concrete cores taken closest to and adjacent to the Tunnel (1) opening. These cores included 001, 003, 004, 011, 018, 019 and 021 The Dose Factor for Ni-63 is the sum of the Dose Factor for Groundwater from LTP Chapter 6, Table 6-19 and the Dose Factor for Drilling Spoils from LTP Chapter 6, (2)

Table 6-20. The value was then adjusted by dividing by 0.9 to account for the Insignificant Contributor Dose Adjustment Factor

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 17 (continued) - Unit 1 Containment Under Vessel Concrete HTD Inventory and Dose Based on FSS Confirmatory Core Samples Concrete Representative Concrete Concrete Result Activity Dose Sample ID Description of Location Nuclide Thickness Area Volume Mass (pCi/g) (cm) (cm2) (cm3) (g) (mCi) (mrem/yr)

B1-01110F-IWC-001-CV Lower Under Vessel wall adj to tunnel Sr-90 4.02E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0043 0.0216 B1-01110F-IWC-003-CV Lower Under Vessel wall adj to tunnel Sr-90 7.87E-02 47.752 9.57E+04 4.57E+06 1.07E+07 0.0008 0.0042 B1-01110F-IWC-004-CV Lower Under Vessel wall adj to tunnel Sr-90 3.23E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0035 0.0174 B1-01110F-IFC-005-CV Under Vessel Floor @ tunnel Sr-90 5.85E-02 60.96 4.26E+04 2.60E+06 6.10E+06 0.0004 0.0018 B1-01110F-IFC-006-CV Under Vessel Floor center-point Sr-90 2.17E-01 60.96 4.26E+04 2.60E+06 6.10E+06 0.0013 0.0066 B1-01110F-IFC-008-CV Under Vessel Floor north Sr-90 2.86E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0031 0.0154 B1-01110F-IWC-010-CV Mid Under Vessel wall west Sr-90 3.44E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0037 0.0185 B1-01110F-IWC-011-CV Mid Under Vessel wall north Sr-90 2.98E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0032 0.0160 B1-01110F-IWC-018-CV Mid Under Vessel wall east Sr-90 2.08E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0022 0.0112 B1-01110F-IWC-019-CV Upper Under Vessel east Sr-90 9.11E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0098 0.0490 B1-01110IF-IFC-003-CV Under Vessel Floor center-point Sr-90 9.64E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0104 0.0519 B1-01110IF-IWC-014-CV Mid Under Vessel wall north Sr-90 1.86E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0020 0.0100 B1-01110IF-IWC-015-CV Lower Under Vessel wall adj to tunnel Sr-90 5.47E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0059 0.0294 B1-01110IF-IWC-016-CV Mid Under Vessel wall west Sr-90 3.77E-01 60.96 4.26E+04 2.60E+06 6.10E+06 0.0023 0.0115 B1-01110IF-IWC-017-CV Lower Under Vessel wall midpoint Sr-90 2.11E-01 60.96 4.26E+04 2.60E+06 6.10E+06 0.0013 0.0064 B1-01110IF-IWC-018-CV Upper Under Vessel east Sr-90 1.37E-01 60.96 4.26E+04 2.60E+06 6.10E+06 0.0008 0.0042 B1-01110IF-IWC-019-CV Lower Under Vessel wall adj to tunnel Sr-90 2.82E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0030 0.0152 B1-01110IF-IWC-020-CV Mid Under Vessel wall east Sr-90 7.04E-01 47.752 9.57E+04 4.57E+06 1.07E+07 0.0076 0.0379 B1-01110IF-IFC-021-CV Under Vessel Floor @ tunnel Sr-90 2.99E-02 47.752 9.57E+04 4.57E+06 1.07E+07 0.0003 0.0016 Avg of 001, 004 and 021 Tunnel Sr-90 2.52E-01 47.752 1.39E+06 6.62E+07 1.56E+08 0.0392 0.1962 Constants Total H-3 Activity Inventory in Under Vessel Concrete 0.1050 mCi Concrete Density = 2.35 g/cm3 Sr-90 Dose Factor (2) = 5.01E+00 mrem/yr per mCi Total Dose from H-3 Inventory in Concrete 0.5262 mrem/yr Conversion Factor = 1.00E-09 mCi/pCi Notes No concrete cores were taken in the tunnel. Result for Sr-90 concentration in Tunnel is the average of the concrete cores taken closest to and adjacent to the Tunnel (1) opening. These cores included 001, 003, 004, 011, 018, 019 and 021 The Dose Factor for Sr-90 is the sum of the Dose Factor for Groundwater from LTP Chapter 6, Table 6-19 and the Dose Factor for Drilling Spoils from LTP Chapter 6, (2)

Table 6-20. The value was then adjusted by dividing by 0.9 to account for the Insignificant Contributor Dose Adjustment Factor

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 13 presents the measured concentrations of each HTD ROC in units of pCi/g from grade to a depth of 1/2-inch for each of the nineteen (19) sample locations. In Table 14, five (5) of the 19 concrete core samples are further analyzed at depths greater than the 1st 1/2-inch. In the April 10th document, it was proposed to convert the measured concentrations of each HTD ROC from units of pCi/g to units of pCi/m2, assuming a depth of 1/2-inch (1.27 cm) and a concrete density of 2.35 g/cm3. The concentration for each HTD ROC could then be directly compared against its respective Operational DCGL to derive a SOF for each. Table 18 shows the results of converting positively identified measured concentrations of H-3, Ni-63 and Sr-90 from the concrete core samples to units of pCi/m2 and then converting to SOF.

Table 18 - Unit 1 Containment Under Vessel FSS Confirmatory Core Samples Measured HTD Concentrations and SOF H-3 H-3 Ni-63 Ni-63 Sr-90 Sr-90 Sample ID No.

(pCi/m2) OpSOF (pCi/m2) OpSOF (pCi/m2) OpSOF B1-01110F-IWC-001-CV 2.62E+06 0.011 2.07E+05 0.0001 B1-01110F-IWC-003-CV 1.01E+06 0.004 7.32E+05 0.0002 B1-01110F-IWC-004-CV 2.65E+06 0.011 5.25E+04 0.0000 B1-01110F-IFC-005-CV 3.61E+06 0.015 B1-01110F-IFC-006-CV 3.26E+06 0.014 B1-01110F-IFC-008-CV 6.83E+06 0.029 B1-01110F-IWC-010-CV 1.03E+06 0.004 B1-01110F-IWC-011-CV 3.87E+06 0.016 1.19E+05 0.0000 B1-01110F-IWC-018-CV 4.08E+07 0.172 8.52E+04 0.0000 B1-01110F-IWC-019-CV 8.97E+07 0.378 1.22E+06 0.0003 2.72E+04 0.0191 B1-01110IF-IFC-003-CV 4.76E+06 0.020 2.88E+04 0.0203 B1-01110IF-IWC-014-CV 1.77E+07 0.075 B1-01110IF-IWC-015-CV 2.42E+06 0.010 6.33E+04 0.0000 B1-01110IF-IWC-016-CV 6.55E+06 0.028 B1-01110IF-IWC-017-CV 3.50E+06 0.015 6.22E+04 0.0000 B1-01110IF-IWC-018-CV 5.80E+06 0.024 B1-01110IF-IWC-019-CV 2.37E+06 0.010 1.42E+06 0.0004 B1-01110IF-IWC-020-CV 4.63E+06 0.020 8.46E+05 0.0002 2.10E+04 0.0148 B1-01110IF-IFC-021-CV 4.57E+06 0.019 Samples = 19 Samples = 10 Samples = 3 Mean = 0.05 Mean = 0.0001 Mean = 0.0181 Max = 0.38 Max = 0.0004 Max = 0.0203 Min = 0.00 Min = 0.0000 Min = 0.0148 SD = 0.09 SD = 0.0001 SD = 0.0029 95%UL = 0.19 95%UL = 0.0003 95%UL = 0.0202 Max OpSOF from HTDs= 0.3991 OpSOF 95%UL from HTDs= 0.2133

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 To demonstrate compliance with the unrestricted release criteria in FSS unit #B1-01100AF and FSS unit #B1-01110AF, the Sign Test was selected as the non-parametric statistical test. The use of the Sign Test did not require the selection or use of a background reference area, which simplified survey design and implementation.

It was proposed to sum the maximum SOF for each HTD ROC to derive a SOF that represented the worst-case dose consequence from the presence of HTD ROC. While the depth of contamination for the HTD ROC is greater than 1/2 inch, use of the maximum concentration compensated for the additional source term at depth. ZSRP also conservatively proposed using the maximum SOF as opposed to the mean or 95%UL SOF to account for any additional, unspecified variability.

The summation of the maximum SOF resulted in a value of 0.3991 which equates to a dose of 9.98 mrem/yr. This value is nearly three times the calculated dose from total inventory of 3.580 mrem/yr from Table 17 (3.05 mrem/yr from H-3 plus 0.0040 mrem/yr from Ni-63 plus 0.5262 mrem/yr from Sr-90). It was then proposed to add this worst-case SOF to each of the measured SOF for the gamma emitting ROC. The combined SOF (including the addition of the maximum SOF for HTD) for each measurement would then be used as the sum value for the Sign Test. Passing the Sign Test with the combined SOF would then demonstrate that the mean activity for each ROC was less than the Operational DCGLB at a Type 1 decision error of 0.05.

The mean measured concentration for each HTD ROC would then be compared to their respective Base Case DCGLs to calculate dose in mrem/yr. The mean SOF, calculated based on the mean measured concentration for each ROC (including HTD ROC) equaled 0.1955, which equates to a mean dose of 4.8881 mrem/yr.

The Elevated Measurement Comparison (EMC) did not apply to this survey unit. At ZSRP, EMC only applies to soils as all other media (structural surfaces, embedded pipe, buried pipe and penetrations) will be remediated to their applicable Base Case DCGL.

A Prospective Power Curve was generated using COMPASS, a software package developed under the sponsorship of the NRC for implementation of the MARSSIM in support of the decommissioning license termination rule (10CFR20, Subpart E). The result of the COMPASS computer run showed adequate power for the survey design (see Attachment 5).

For this Class 1 basement structure survey unit, the Investigation Levels for ISOCS measurement results are those levels specified in LTP Chapter 5, Table 5-25 and are reproduced below in Table 19.

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 19 - Investigation Levels Classification Direct Measurement Class 1 >Operational DCGL Table 20 provides a synopsis of the survey designs for FSS unit #B1-01100AF and FSS unit #B1-01110AF.

Table 20 - Synopsis of Survey Design FEATURE DESIGN CRITERIA BASIS Under Vessel 294 m2 Survey Unit Surface Areas LTP Ch. 5, Table 5-19 Above 565 ft. 2,465 m2 Under Vessel 19(1)

Number of ISOCS Measurements LTP Ch. 5, Table 5-19 Above 565 ft. 155(1)

UBGR = SOF of 1

LBGR = SOF of 0.01

Type I error = 0.05

Type II error = 0.05 LTP Chapter 5, Sec.

Survey Design

/ = 3 (adjusted) (above 5.5.2.2 565 ft.)

/ = 2 (Under Vessel)

MARSSIM Table 5.5 100% Areal Coverage LTP Chapter 5, Sec.

Grid Spacing (Planned for 28 m2 FOV) 5.5.2.2 LTP Chapter 5, Tables DCGLs See Tables 3 and 4 above 5-3 and 5-4 LTP Chapter 5, Table Investigation Level >Operational DCGL 5-25 5 % Duplicate ISOCS LTP Chapter 5, Sec.

QC Measurements 5.9.3.1 (1) The number of ISOCS measurements designated in the survey designs is greater than the minimum number required for these survey units per Chapter 5 of the LTP, Table 5-19. Fifty four (54) measurements were required to achieve 100% coverage of the Under Vessel. One hundred and sixty four (164) measurements were required for 100% coverage of the 565 ft.

6. SURVEY IMPLEMENTATION For FSS unit #B1-01100AF and FSS unit #B1-01110AF, compliance with the unrestricted release criteria was demonstrated through a combination of direct measurements using the ISOCS and the analysis of concrete core samples obtained from the Under Vessel area.

Field Logs (ZS-LT-300-001-001 Attachment 14) were used to document field activities and other information pertaining to the performance of the FSS. Daily briefings were

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 conducted to discuss the expectations for job performance and to review safety aspects of the job.

ZionSolutions TSD 14-022 provided the initial justification for the selection of reasonably conservative geometries for efficiency calibrations for the ISOCS based on the physical conditions of the remediated surface and the anticipated depth and distribution of activity.

All ISOCS measurements were acquired using approved geometries. Various stand-off distances were utilized due to space constraints in the Incore Tunnel area. Graphics containing the details of those geometries are attached to this Release Record. The number and locations of the ISOCS shots were adjusted to ensure 100% coverage of the surfaces of the steel liner above the 565 ft. elevation, the Under Vessel and Incore Tunnel area.

Between 2014 and 2017, decommissioning activities involved the removal of all radioactive systems and components from the interior of the Unit 1 Containment, including major components such as the Reactor Vessel, the Steam Generators, the Pressurizer, the Reactor Coolant Pumps as well as all contaminated primary and secondary pipe. In 2017, all contaminated concrete was removed from the interior of the Containment above the 565 ft. elevation, leaving only the exposed 1/2-inch steel liner and several penetrations.

Initial remediation of the Under Vessel concrete was performed between November 2017 and February 27, 2018. Remediation techniques included the scabbling and hammering of the concrete surface using hydraulic hoe-rams. Concrete debris was then removed through load-out of waste skids. Approximately 2 to 4 inches of concrete was removed from the walls and floor directly below where the Reactor Vessel was located and approximately 1 to 2 inches of concrete was removed from the walls and floor of the sloped tunnel.

Both the interior above the 565 ft. elevation and the Under Vessel area of Unit 1 Containment was initially turned over to the C/LT Group on February 27, 2018 anticipating that the remediation performed was sufficient to meet the unrestricted release criteria.

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 10 - Unit 1 Under Vessel In-Core Tunnel Remediation

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Remediation was completed on February 27, 2018. The area was cleaned and turned over to the C/LT group for FSS. A walkdown and turnover survey was satisfactorily performed in both FSS units in accordance with the Isolation and Control requirements of procedure ZS-LT-300-001-003, Isolation and Control for Final Status Survey (Reference 13). The turnover surveys consisted of surveys for loose surface contamination as well as the acquisition of several ISOCS measurements in areas that had previously failed FSS. All smear results were less than 1,000 dpm/100 cm2 and all ISOCS measurements indicated a SOF of less than one for all ROC. The Unit 1 Containment was deemed acceptable for turnover and FSS commenced in the Under Vessel area on March 5, 2018.

An ISOCS unit was put into service on the 565 ft. elevation (Survey Unit #B1-01100) on 03/13/18 and FSS measurements were taken on that elevation while preparations were made to collect concrete core samples in the Under Vessel area. Nineteen (19) concrete core samples were collected in the Under Vessel area from 03/13/15 through 3/15/18. The core samples were taken to a depth of six inches.

The ISOCS detector was positioned horizontal or vertical to the surface at the center-point of each selected measurement location. In most cases, the exposed face of the detector was positioned at a distance of 3 meters from the surface with the 90- degree collimation shield installed; this orientation corresponded to a nominal FOV of 28 m2. The detector to source distance was reduced even further to accommodate physical constraints or encountered obstructions. In this case, the FOV was reduced and the number of measurements increased to ensure 100% areal coverage was achieved.

The measured activity for each gamma-emitting ROC (and any other gamma emitting radionuclide that was positively detected by ISOCS) was recorded (in units of pCi/m2).

Background was not subtracted from any measurement. A SOF calculation was performed for each measurement by dividing the reported concentration of each ROC by the Operational DCGL for each ROC to derive an individual ROC fraction. The individual ROC fractions were then summed to provide a total SOF value for the measurement.

Nine (9) duplicate measurements were taken with the ISOCS above the 565 ft. elevation and three (3) duplicate measurements were taken with the ISOCS in the Under Vessel area. Above the 565 ft. elevation, the locations selected for taking duplicate measurements were at locations 036, 089, 100, 124, 125, 143, 146, 150 and 153. In the Under Vessel area, the locations selected for taking duplicate measurements were at locations 006, 016 and 051. These locations were randomly selected using the Microsoft Excel RANDBETWEEN function. The number of replicate measurements satisfies the requirement that a minimum of 5% percent of the number of measurements

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 that will be used for non-parametric statistical testing be selected for additional QC evaluation.

7. SURVEY RESULTS The SOF or unity rule is applied to the data used for the survey planning, and data evaluation and statistical tests for basement surfaces since multiple radionuclide-specific measurements will be performed or the concentrations inferred based on known relationships. The application of the unity rule serves to normalize the data to allow for an accurate comparison of the various data measurements to the release criteria. When the unity rule is applied, the DCGLw (used for the nonparametric statistical test) becomes one (1). The Base Case basement structure DCGLs (BcDCGLB), are directly analogous to the DCGLW as defined in MARSSIM. The use and application of the unity rule was performed in accordance with section 4.3.3 of MARSSIM.

As described in LTP Chapter 5, section 5.10.3.2, the Sign Test was used to evaluate the measured residual radioactivity against the dose criterion. The SOF for each measurement was used as the sum value for the Sign Test. The Sign Test then demonstrated that the mean activity for each ROC was less than the Operational DCGLB at a Type 1 decision error of 0.05.

For building surfaces, areas of elevated activity were defined as any area identified by measurement/sample (systematic or judgmental) that exceeded the Operational DCGL but was less than the Base Case DCGL. Any area that exceeded the Base Case DCGL would have required remediation. The SOF (based on the Operational DCGL) for a systematic or a judgmental measurement/sample(s) can exceed one without remediation as long as the survey unit passes the Sign Test and, the mean SOF (based on the Operational DCGL) for the survey unit does not exceed one. Once the survey data set passes the Sign Test (using Operational DCGLs), then the mean radionuclide activity (pCi/m2) for each ROC from systematic measurements along with any identified elevated areas from systematic and judgmental samples can be used with the Base Case DCGLs to perform a mean SOFB calculation. The dose from residual radioactivity assigned to the FSS unit is the mean SOFB multiplied by 25 mrem/yr.

Unit 1 Containment above the 565 ft. Elevation Direct measurement locations were denoted on the steel liner above the 565 ft. elevation by marking an approximate 4 meter by 4 meter grid pattern using a random start point that was overlaid over the exposed surface, providing sufficient overlap between locations to ensure 100% areal coverage. See Figures 11 and 12 for a depiction of all measurement locations.

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 The systematic sample population consisted of one hundred and sixty four (164) direct measurements that were acquired using the ISOCS. A summary of the results of the 164 ISOCS measurements taken for non-parametric statistical testing results is provided in Table 21. The concentrations for H-3, Ni-63 and Sr-90 are inferred based on the maximum ratios as specified in LTP Chapter 5, Table 5-15. The complete ISOCS gamma spectroscopy reports are presented in Attachment 6. The basic statistics for the systematic measurements are summarized in Table 22.

Figure 11 - ISOCS Measurements of Unit 1 Containment Above 565 ft. Elevation

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 12 - Unit 1 Containment Above 565 ft. Elevation FSS Floor Measurement Locations

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 13 - Unit 1 Containment Above 565 ft. Elevation FSS Wall Measurement Locations

[75]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 21 - Unit 1 Containment Above 565 ft. Elevation - Measured Concentrations of ROC for FSS H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 OpSOF MEASUREMENT ID (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

B1-01100AF-SWM-001-GD 2.08E+05 6.63E+04 2.93E+07 2.48E+03 1.19E+04 1.18E+05 1.13E+04 1.85E+04 0.1008 B1-01100AF-SWM-002-GD 9.61E+04 4.39E+04 1.94E+07 1.15E+03 6.74E+03 5.46E+04 5.32E+04 0.00E+00 0.0589 B1-01100AF-SWM-003-GD 1.68E+05 1.96E+04 8.64E+06 2.01E+03 0.00E+00 9.56E+04 5.54E+03 2.43E+04 0.0504 B1-01100AF-SWM-004-GD 2.89E+05 5.16E+04 2.28E+07 3.45E+03 6.17E+03 1.64E+05 2.44E+04 3.22E+04 0.1036 B1-01100AF-SWM005-GD 5.12E+05 4.09E+04 1.81E+07 6.11E+03 1.52E+04 2.91E+05 2.97E+04 3.11E+04 0.1406 B1-01100AF-SWM-006-GD 3.06E+05 3.36E+04 1.49E+07 3.65E+03 4.32E+03 1.74E+05 4.68E+04 1.49E+04 0.0912 B1-01100AF-SWM-007-GD 3.82E+05 3.66E+04 1.62E+07 4.55E+03 9.48E+02 2.17E+05 2.92E+04 5.08E+04 0.1083 B1-01100AF-SWM-008-GD 2.92E+05 2.65E+04 1.17E+07 3.48E+03 6.64E+03 1.66E+05 1.34E+04 2.92E+04 0.0826 B1-01100AF-SWM-009-GD 4.15E+05 4.94E+04 2.18E+07 4.95E+03 1.43E+04 2.36E+05 3.23E+03 0.00E+00 0.1273 B1-01100AF-SWM-010-GD 3.51E+05 2.99E+04 1.32E+07 4.19E+03 9.83E+02 1.99E+05 1.10E+04 6.43E+04 0.0965 B1-01100AF-SWM-011-GD 1.49E+05 2.91E+04 1.29E+07 1.78E+03 0.00E+00 8.46E+04 2.13E+04 3.19E+03 0.0546 B1-01100AF-SWM-012-GD 3.93E+05 4.82E+04 2.13E+07 4.69E+03 1.95E+04 2.23E+05 4.86E+04 4.40E+04 0.1251 B1-01100AF-SWM-013-GD 3.91E+05 7.64E+04 3.38E+07 4.66E+03 2.46E+03 2.22E+05 3.39E+03 0.00E+00 0.1426 B1-01100AF-SWM-014-GD 1.44E+05 3.94E+04 1.74E+07 1.71E+03 3.11E+04 8.17E+04 4.66E+04 1.37E+03 0.0703 B1-01100BF-SWM-015-GD 1.26E+05 3.95E+04 1.75E+07 1.50E+03 2.67E+04 7.15E+04 6.94E+03 7.53E+03 0.0652 B1-01100AF-SWM-016-GD 2.22E+05 4.44E+04 1.96E+07 2.65E+03 6.95E+03 1.26E+05 1.42E+04 7.08E+03 0.0837 B1-01100BF-SWM-017-GD 2.35E+05 4.50E+04 1.99E+07 2.80E+03 3.64E+03 1.33E+05 4.68E+04 2.93E+04 0.0870 B1-01100BF-SWM-018-GD 9.74E+04 4.54E+04 2.01E+07 1.16E+03 2.63E+02 5.53E+04 5.77E+04 6.34E+04 0.0605 B1-01100BF-SWM-019-GD 1.06E+05 4.38E+04 1.94E+07 1.27E+03 8.81E+03 6.04E+04 2.69E+04 3.82E+04 0.0617 B1-01100BF-SWM-020-GD 1.73E+05 4.33E+04 1.91E+07 2.07E+03 2.46E+03 9.84E+04 5.38E+04 8.37E+04 0.0745 B1-01100AF-SWM-021-GD 2.47E+05 7.74E+04 3.42E+07 2.95E+03 1.07E+03 1.40E+05 6.79E+04 2.13E+04 0.1166 B1-01100AF-SWM-022-GD 9.08E+04 4.80E+04 2.12E+07 1.08E+03 2.12E+04 5.16E+04 1.20E+04 1.95E+04 0.0646 B1-01100AF-SWM-023-GD 8.01E+04 3.08E+04 1.36E+07 9.56E+02 2.35E+03 4.55E+04 1.56E+04 1.67E+04 0.0432 B1-01100AF-SWM-024-GD 3.61E+05 7.55E+04 3.34E+07 4.30E+03 1.59E+04 2.05E+05 9.21E+04 0.00E+00 0.1409 B1-01100AF-SWM-025-GD 2.97E+05 4.12E+04 1.82E+07 3.54E+03 0.00E+00 1.69E+05 2.37E+04 2.10E+04 0.0944 B1-01100AF-SWM-026-GD 1.31E+05 2.99E+04 1.32E+07 1.56E+03 1.45E+04 7.44E+04 6.32E+03 6.31E+03 0.0550 B1-01100AF-SWM-027-GD 1.44E+05 2.84E+04 1.25E+07 1.71E+03 4.19E+03 8.16E+04 6.06E+04 0.00E+00 0.0546 B1-01100AF-SWM-028-GD 2.29E+05 3.51E+04 1.55E+07 2.73E+03 0.00E+00 1.30E+05 2.41E+04 1.99E+04 0.0759 B1-01100AF-SWM-029-GD 2.36E+05 5.44E+04 2.40E+07 2.82E+03 9.40E+03 1.34E+05 1.68E+04 7.49E+03 0.0956 B1-01100AF-SWM-030-GD 1.21E+05 3.56E+04 1.57E+07 1.44E+03 1.97E+04 6.87E+04 2.07E+04 7.44E+03 0.0595

[76]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 21 (continued) - Unit 1 Containment Above 565 ft. Elevation - Measured Concentrations of ROC for FSS H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 OpSOF MEASUREMENT ID (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

B1-01100AF-SWM-031-GD 8.40E+04 2.63E+04 1.16E+07 1.00E+03 0.00E+00 4.77E+04 1.09E+04 2.53E+04 0.0397 B1-01100AF-SWM-032-GD 2.61E+05 7.00E+04 3.09E+07 3.12E+03 0.00E+00 1.48E+05 7.48E+04 1.07E+04 0.1127 B1-01100AF-SWM-033-GD 3.31E+05 6.70E+04 2.96E+07 3.95E+03 3.09E+03 1.88E+05 2.21E+04 7.22E+04 0.1250 B1-01100AF-SWM-034-GD 1.44E+05 3.53E+04 1.56E+07 1.72E+03 1.51E+04 8.20E+04 2.53E+04 1.10E+04 0.0629 B1-01100AF-SWM-035-GD 2.60E+05 4.06E+04 1.80E+07 3.10E+03 0.00E+00 1.48E+05 7.97E+04 3.65E+04 0.0882 B1-01100AF-SWM-036-GD 4.12E+05 5.56E+04 2.46E+07 4.92E+03 5.31E+03 2.34E+05 3.70E+04 1.92E+04 0.1309 B1-01100AF-SWM-037-GD 4.79E+05 5.45E+04 2.41E+07 5.71E+03 1.26E+04 2.72E+05 4.59E+04 6.79E+03 0.1448 B1-01100AF-SWM-038-GD 2.54E+05 3.98E+04 1.76E+07 3.03E+03 0.00E+00 1.44E+05 0.00E+00 2.30E+04 0.0843 B1-01100AF-SWM-039-GD 2.36E+05 4.09E+04 1.81E+07 2.81E+03 2.70E+02 1.34E+05 5.93E+04 1.95E+04 0.0829 B1-01100AF-SWM-040-GD 4.62E+05 7.66E+04 3.38E+07 5.51E+03 1.25E+04 2.62E+05 1.51E+04 2.50E+04 0.1600 B1-01100AF-SWM-041-GD 3.78E+05 1.01E+05 4.47E+07 4.52E+03 0.00E+00 2.15E+05 5.50E+04 1.77E+04 0.1621 B1-01100AF-SWM-042-GD 2.47E+05 6.65E+04 2.94E+07 2.95E+03 2.35E+04 1.40E+05 3.07E+04 4.30E+03 0.1116 B1-01100AF-SWM-043-GD 3.62E+05 1.15E+05 5.10E+07 4.32E+03 1.76E+04 2.06E+05 8.34E+03 5.22E+04 0.1751 B1-01100AF-SWM-044-GD 1.54E+05 8.67E+04 3.83E+07 1.84E+03 0.00E+00 8.76E+04 4.34E+04 8.19E+04 0.1068 B1-01100AF-SWM-045-GD 9.31E+04 4.28E+04 1.89E+07 1.11E+03 8.42E+03 5.29E+04 3.45E+04 1.23E+04 0.0578 B1-01100AF-SWM-046-GD 2.95E+05 5.78E+04 2.56E+07 3.52E+03 0.00E+00 1.68E+05 2.49E+04 3.57E+04 0.1087 B1-01100AF-SWM-047-GD 1.96E+05 6.66E+04 2.94E+07 2.34E+03 2.20E+04 1.11E+05 3.36E+04 1.46E+04 0.1016 B1-01100AF-SWM-048-GD 1.60E+06 5.34E+05 2.36E+08 1.90E+04 2.89E+04 9.07E+05 6.71E+05 1.38E+05 0.7919 B1-01100AF-SWM-049-GD 2.60E+05 1.90E+05 8.38E+07 3.10E+03 6.45E+03 1.48E+05 7.33E+04 1.02E+04 0.2156 B1-01100AF-SWM-050-GD 3.22E+05 8.47E+04 3.75E+07 3.85E+03 3.46E+03 1.83E+05 3.37E+04 8.95E+03 0.1373 B1-01100AF-SWM-051-GD 6.17E+05 9.81E+04 4.34E+07 7.37E+03 1.24E+04 3.51E+05 7.20E+04 1.22E+04 0.2098 B1-01100AF-SWM-052-GD 7.51E+05 1.50E+05 6.65E+07 8.96E+03 3.05E+04 4.27E+05 3.27E+04 1.11E+04 0.2841 B1-01100AF-SWM-053-GD 1.87E+05 6.34E+04 2.80E+07 2.23E+03 4.33E+03 1.06E+05 3.89E+04 2.50E+03 0.0926 B1-01100AF-SWM-054-GD 5.13E+05 7.42E+04 3.28E+07 6.12E+03 5.54E+03 2.91E+05 5.43E+04 3.62E+04 0.1674 B1-01100AF-SWM-055-GD 4.09E+05 1.01E+05 4.45E+07 4.88E+03 1.57E+03 2.32E+05 2.61E+03 4.05E+04 0.1675 B1-01100AF-SWM-056-GD 1.12E+05 5.98E+04 2.64E+07 1.33E+03 5.75E+03 6.34E+04 2.88E+04 0.00E+00 0.0748 B1-01100AF-SWM-057-GD 8.48E+04 4.90E+04 2.17E+07 1.01E+03 1.02E+04 4.82E+04 2.28E+04 1.39E+04 0.0617 B1-01100AF-SWM-058-GD 3.99E+05 1.07E+05 4.73E+07 4.75E+03 0.00E+00 2.26E+05 2.51E+04 3.18E+04 0.1707 B1-01100AF-SWM-059-GD 4.40E+05 9.67E+04 4.28E+07 5.26E+03 6.32E+03 2.50E+05 3.15E+04 4.26E+03 0.1713 B1-01100AF-SWM-060-GD 1.59E+05 2.89E+04 1.28E+07 1.89E+03 6.86E+03 9.01E+04 3.76E+04 4.66E+03 0.0583

[77]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 21 (continued) - Unit 1 Containment Above 565 ft. Elevation - Measured Concentrations of ROC for FSS H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 OpSOF MEASUREMENT ID (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

B1-01100AF-SWM-061-GD 2.30E+05 5.52E+04 2.44E+07 2.74E+03 2.49E+03 1.31E+05 1.36E+04 0.00E+00 0.0931 B1-01100AF-SWM-062-GD 4.39E+05 1.32E+05 5.85E+07 5.23E+03 1.27E+04 2.49E+05 8.49E+03 1.04E+04 0.2024 B1-01100AF-SWM-063-GD 3.48E+05 2.04E+05 9.03E+07 4.15E+03 0.00E+00 1.98E+05 1.34E+04 2.23E+04 0.2431 B1-01100AF-SWM-064-GD 1.41E+05 6.28E+04 2.77E+07 1.68E+03 1.63E+04 7.99E+04 6.38E+04 1.82E+04 0.0867 B1-01100AF-SWM-065-GD 7.87E+04 4.63E+04 2.05E+07 9.39E+02 7.68E+02 4.47E+04 2.12E+04 7.30E+03 0.0556 B1-01100AF-SWM-066-GD 2.75E+05 1.30E+05 5.77E+07 3.28E+03 0.00E+00 1.56E+05 3.00E+04 7.67E+04 0.1674 B1-01100AF-SWM-067-GD 2.36E+05 7.74E+04 3.42E+07 2.82E+03 9.06E+03 1.34E+05 1.54E+04 3.59E+04 0.1157 B1-01100AF-SWM-068-GD 8.03E+04 3.62E+04 1.60E+07 9.58E+02 0.00E+00 4.56E+04 1.43E+04 3.13E+04 0.0476 B1-01100AF-SFM-075-GD 7.02E+05 2.04E+05 9.02E+07 8.37E+03 9.54E+03 3.99E+05 1.05E+05 1.40E+04 0.3165 B1-01100AF-SFM-076-GD 3.22E+05 9.84E+04 4.35E+07 3.84E+03 2.12E+04 1.83E+05 2.53E+03 7.04E+02 0.1523 B1-01100AF-SFM-077-GD 4.19E+05 1.74E+05 7.69E+07 5.00E+03 2.12E+04 2.38E+05 2.07E+04 5.15E+04 0.2371 B1-01100AF-SFM-078-GD 9.87E+04 6.87E+04 3.03E+07 1.18E+03 1.53E+04 5.61E+04 1.12E+05 7.58E+04 0.0855 B1-01100AF-SFM-079-GD 3.00E+05 5.92E+04 2.62E+07 3.58E+03 1.28E+04 1.70E+05 3.72E+04 3.82E+04 0.1141 B1-01100AF-SFM-080-GD 4.06E+05 7.52E+04 3.32E+07 4.84E+03 4.60E+03 2.30E+05 1.41E+04 1.04E+04 0.1454 B1-01100AF-SFM-081-GD 7.31E+05 1.19E+05 5.24E+07 8.73E+03 1.61E+04 4.16E+05 2.08E+04 6.36E+04 0.2508 B1-01100AF-SFM-082-GD 6.31E+05 1.12E+05 4.94E+07 7.52E+03 8.27E+03 3.58E+05 5.82E+04 3.03E+04 0.2232 B1-01110AF-SFM-083-GD 4.11E+05 6.34E+04 2.80E+07 4.91E+03 1.51E+04 2.34E+05 2.39E+04 3.63E+04 0.1399 B1-01100AF-SFM-084-GD 1.11E+05 2.23E+04 9.86E+06 1.32E+03 1.47E+04 6.30E+04 2.33E+04 3.55E+02 0.0449 B1-01100AF-SFM-085-GD 2.13E+05 6.52E+04 2.88E+07 2.54E+03 1.82E+04 1.21E+05 2.83E+04 5.69E+03 0.1025 B1-01100AF-SFM-086-GD 3.60E+05 4.15E+04 1.84E+07 4.29E+03 1.63E+04 2.04E+05 0.00E+00 3.15E+04 0.1109 B1-01100AF-SFM-087-GD 9.41E+04 3.25E+04 1.43E+07 1.12E+03 1.71E+03 5.35E+04 1.08E+04 0.00E+00 0.0468 B1-01100AF-SFM-088-GD 1.18E+05 4.73E+04 2.09E+07 1.41E+03 2.18E+04 6.71E+04 2.19E+04 8.02E+03 0.0694 B1-01100AF-SFM-089-GD 5.38E+05 1.08E+05 4.77E+07 6.42E+03 0.00E+00 3.06E+05 3.32E+04 3.11E+04 0.1993 B1-01100AF-SFM-092-GD 5.53E+05 1.81E+05 8.00E+07 6.59E+03 2.65E+04 3.14E+05 1.13E+05 2.42E+04 0.2720 B1-01100AF-SFM-093-GD 7.73E+04 3.60E+04 1.59E+07 9.22E+02 7.13E+03 4.39E+04 4.90E+04 9.21E+03 0.0487 B1-01100AF-SFM-094-GD 8.75E+04 3.29E+04 1.45E+07 1.04E+03 1.93E+04 4.97E+04 2.08E+04 6.23E+03 0.0504 B1-01100AF-SFM-095-GD 1.76E+05 4.59E+04 2.03E+07 2.10E+03 6.21E+03 1.00E+05 1.68E+04 8.92E+03 0.0758 B1-01100AF-SFM-096-GD 1.35E+06 4.43E+04 1.96E+07 1.61E+04 1.25E+04 7.67E+05 3.72E+04 2.43E+04 0.3081 B1-01100AF-SFM-097-GD 8.22E+05 4.97E+04 2.20E+07 9.81E+03 1.68E+04 4.67E+05 3.01E+03 1.23E+04 0.2087 B1-01100AF-SFM-098-GD 1.49E+05 2.53E+04 1.12E+07 1.77E+03 9.81E+03 8.45E+04 3.77E+03 2.04E+04 0.0537

[78]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 21 (continued) - Unit 1 Containment Above 565 ft. Elevation - Measured Concentrations of ROC for FSS H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 OpSOF MEASUREMENT ID (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

B1-01100AF-SFM-099-GD 6.54E+04 1.67E+04 7.40E+06 7.80E+02 7.76E+03 3.71E+04 3.48E+04 3.20E+04 0.0304 B1-01100AF-SFM-100-GD 4.96E+05 7.91E+04 3.50E+07 5.92E+03 9.49E+01 2.82E+05 3.89E+04 1.70E+04 0.1662 B1-01100AF-SFM-102-GD 7.52E+05 1.00E+05 4.43E+07 8.98E+03 4.86E+03 4.28E+05 8.36E+04 1.05E+04 0.2367 B1-01100AF-SFM-103-GD 1.06E+05 1.89E+04 8.35E+06 1.27E+03 7.81E+03 6.05E+04 3.19E+04 1.43E+03 0.0396 B1-01100AF-SFM-104-GD 1.22E+05 1.94E+04 8.57E+06 1.45E+03 0.00E+00 6.93E+04 3.96E+04 5.01E+04 0.0425 B1-01100AF-SFM-105-GD 3.00E+05 1.81E+04 8.02E+06 3.57E+03 2.07E+04 1.70E+05 8.47E+04 2.70E+04 0.0818 B1-01100AF-SFM-106-GD 3.53E+05 4.14E+04 1.83E+07 4.22E+03 1.24E+04 2.01E+05 2.48E+04 3.82E+04 0.1092 B1-01100AF-SFM-107-GD 1.17E+05 3.02E+04 1.33E+07 1.39E+03 7.80E+03 6.62E+04 1.60E+05 1.59E+04 0.0541 B1-01100AF-SFM-109-GD 8.91E+04 3.24E+04 1.43E+07 1.06E+03 1.51E+04 5.06E+04 1.27E+05 0.00E+00 0.0513 B1-01100AF-SFM-110-GD 1.73E+05 5.43E+04 2.40E+07 2.06E+03 0.00E+00 9.83E+04 5.52E+04 5.69E+04 0.0827 B1-01100AF-SFM-111-GD 8.34E+05 1.44E+05 6.35E+07 9.96E+03 4.18E+02 4.74E+05 6.14E+04 4.37E+04 0.2889 B1-01100AF-SFM-112-GD 7.13E+05 1.39E+05 6.16E+07 8.50E+03 1.66E+04 4.05E+05 1.43E+04 7.53E+04 0.2649 B1-01100AF-SFM-113-GD 8.39E+04 3.44E+04 1.52E+07 1.00E+03 0.00E+00 4.77E+04 3.42E+04 2.33E+03 0.0465 B1-01100AF-SFM-114-GD 1.96E+05 4.57E+04 2.02E+07 2.34E+03 0.00E+00 1.12E+05 9.18E+03 1.00E+04 0.0779 B1-01100AF-SFM-115-GD 1.07E+05 5.38E+04 2.38E+07 1.28E+03 0.00E+00 6.10E+04 8.04E+03 3.17E+03 0.0671 B1-01100AF-SFM-116-GD 1.17E+05 1.08E+05 4.79E+07 1.40E+03 9.80E+03 6.66E+04 6.30E+05 3.63E+05 0.1385 B1-01100AF-SFM-117-GD 3.29E+05 4.51E+05 1.99E+08 3.92E+03 1.39E+04 1.87E+05 2.94E+06 1.22E+05 0.5134 B1-01100AF-SFM-118-GD 5.48E+05 3.98E+04 1.76E+07 6.54E+03 0.00E+00 3.12E+05 1.09E+04 2.48E+04 0.1426 B1-01100AF-SFM-119-GD 1.35E+05 2.46E+04 1.09E+07 1.61E+03 3.46E+02 7.66E+04 1.24E+04 1.49E+04 0.0481 B1-01100AF-SFM-120-GD 1.09E+05 1.53E+04 6.74E+06 1.30E+03 0.00E+00 6.18E+04 7.92E+04 3.00E+04 0.0367 B1-01100AF-SFM-121-GD 3.76E+05 7.47E+04 3.30E+07 4.49E+03 1.51E+04 2.14E+05 5.44E+04 1.24E+04 0.1427 B1-01100AF-SFM-122-GD 2.52E+05 5.73E+04 2.53E+07 3.01E+03 1.35E+04 1.43E+05 6.33E+04 9.71E+03 0.1032 B1-01100AF-SFM-123-GD 8.62E+04 1.70E+04 7.51E+06 1.03E+03 7.77E+02 4.89E+04 5.48E+04 2.18E+04 0.0332 B1-01100AF-SFM-124-GD 1.66E+05 2.97E+04 1.31E+07 1.98E+03 1.76E+04 9.43E+04 7.43E+03 2.98E+04 0.0630 B1-01100AF-SFM-125-GD 4.61E+05 4.66E+04 2.06E+07 5.51E+03 2.32E+04 2.62E+05 7.93E+04 5.52E+04 0.1390 B1-01100AF-SFM-126-GD 1.30E+06 9.01E+05 3.98E+08 1.55E+04 5.83E+04 7.37E+05 5.71E+06 2.74E+05 1.1565 B1-01100AF-SFM-128-GD 2.16E+05 1.55E+05 6.87E+07 2.58E+03 5.09E+03 1.23E+05 9.12E+05 5.65E+05 0.2072 B1-01100AF-SFM-129-GD 8.37E+04 2.94E+04 1.30E+07 9.99E+02 2.70E+02 4.76E+04 2.65E+04 4.97E+03 0.0422 B1-01100AF-SFM-130-GD 1.49E+05 4.71E+04 2.08E+07 1.78E+03 4.42E+03 8.46E+04 1.57E+04 3.37E+03 0.0709 B1-01100AF-SFM-131-GD 9.19E+04 2.84E+04 1.25E+07 1.10E+03 1.21E+04 5.22E+04 2.53E+04 1.31E+04 0.0460

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 21 (continued) - Unit 1 Containment Above 565 ft. Elevation - Measured Concentrations of ROC for FSS H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 OpSOF MEASUREMENT ID (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

B1-01100AF-SFM-132-GD 6.05E+05 1.43E+05 6.34E+07 7.22E+03 2.01E+04 3.44E+05 2.56E+04 2.93E+04 0.2473 B1-01100AF-SFM-133-GD 3.87E+05 1.20E+05 5.31E+07 4.62E+03 3.38E+04 2.20E+05 1.12E+05 4.58E+04 0.1899 B1-01100AF-SFM-134-GD 9.94E+04 6.39E+04 2.82E+07 1.19E+03 0.00E+00 5.65E+04 2.42E+04 1.27E+04 0.0747 B1-01100AF-SFM-135-GD 7.34E+04 1.71E+04 7.55E+06 8.75E+02 0.00E+00 4.17E+04 3.36E+04 8.63E+03 0.0299 B1-01100AF-SFM-136-GD 6.73E+04 2.36E+04 1.04E+07 8.03E+02 5.24E+03 3.82E+04 1.04E+05 2.29E+04 0.0372 B1-01100AF-SFM-137-GD 1.32E+05 3.37E+04 1.49E+07 1.58E+03 5.15E+03 7.52E+04 5.66E+04 1.34E+04 0.0574 B1-01100AF-SFM-138-GD 3.28E+05 1.25E+05 5.50E+07 3.92E+03 6.29E+04 1.86E+05 7.67E+05 4.53E+05 0.2115 B1-01100AF-SFM-139-GD 1.16E+05 5.81E+04 2.57E+07 1.39E+03 1.21E+04 6.60E+04 1.33E+05 8.43E+04 0.0798 B1-01100AF-SFM-140-GD 6.65E+04 2.45E+04 1.08E+07 7.94E+02 1.63E+04 3.78E+04 6.74E+04 3.76E+04 0.0401 B1-01100AF-SFM-141-GD 3.13E+04 1.49E+04 6.56E+06 3.73E+02 9.21E+03 1.78E+04 7.95E+04 4.43E+03 0.0227 B1-01100AF-SFM-142-GD 5.67E+04 1.60E+04 7.08E+06 6.76E+02 0.00E+00 3.22E+04 8.87E+04 3.71E+04 0.0274 B1-01100AF-SFM-143-GD 1.90E+05 5.25E+04 2.32E+07 2.26E+03 3.97E+03 1.08E+05 5.93E+04 4.00E+04 0.0851 B1-01100AF-SFM-144-GD 2.23E+05 5.02E+04 2.22E+07 2.66E+03 2.47E+04 1.27E+05 9.38E+03 1.60E+04 0.0932 B1-01100AF-SFM-145-GD 5.63E+04 1.73E+04 7.65E+06 6.72E+02 1.67E+04 3.20E+04 2.89E+04 3.57E+04 0.0312 B1-01100AF-SFM-146-GD 3.48E+04 3.01E+04 1.33E+07 4.15E+02 1.35E+04 1.98E+04 3.96E+04 2.38E+04 0.0370 B1-01100AF-SFM-147-GD 3.26E+04 3.25E+04 1.43E+07 3.89E+02 0.00E+00 1.85E+04 9.32E+03 4.54E+04 0.0352 B1-01100AF-SFM-148-GD 7.83E+04 1.67E+04 7.36E+06 9.35E+02 9.38E+03 4.45E+04 9.58E+04 2.04E+03 0.0338 B1-01100AF-SFM-149-GD 6.03E+04 3.23E+04 1.43E+07 7.19E+02 3.91E+03 3.42E+04 2.19E+04 2.53E+04 0.0413 B1-01100AF-SFM-150-GD 6.08E+04 2.93E+04 1.30E+07 7.26E+02 0.00E+00 3.46E+04 3.11E+04 1.99E+04 0.0380 B1-01100AF-SFM-151-GD 3.22E+04 1.66E+04 7.35E+06 3.85E+02 1.88E+04 1.83E+04 5.41E+04 0.00E+00 0.0261 B1-01100AF-SFM-152-GD 1.67E+05 4.76E+04 2.10E+07 1.99E+03 0.00E+00 9.47E+04 8.31E+04 1.92E+03 0.0750 B1-01100AF-SFM-153-GD 4.24E+05 9.04E+04 4.00E+07 5.06E+03 1.40E+04 2.41E+05 2.54E+04 6.16E+03 0.1644 B1-01100AF-SFM-154-GD 4.25E+05 1.52E+05 6.72E+07 5.07E+03 1.83E+04 2.42E+05 1.42E+04 5.48E+03 0.2179 B1-01100AF-SFM-155-GD 6.27E+04 2.38E+04 1.05E+07 7.48E+02 0.00E+00 3.56E+04 2.20E+04 3.41E+04 0.0338 B1-01100AF-SFM-156-GD 8.06E+04 2.62E+04 1.16E+07 9.62E+02 1.45E+04 4.58E+04 8.56E+03 1.70E+04 0.0422 B1-01100AF-SFM-157-GD 6.58E+04 3.25E+04 1.44E+07 7.85E+02 2.10E+03 3.74E+04 4.68E+04 2.65E+04 0.0426 B1-01100AF-SFM-158-GD 3.54E+04 1.91E+04 8.43E+06 4.22E+02 0.00E+00 2.01E+04 1.05E+05 2.60E+04 0.0259 B1-01100AF-SFM-159-GD 4.75E+04 1.91E+04 8.43E+06 5.66E+02 8.72E+03 2.70E+04 1.19E+04 9.57E+03 0.0281 B1-01100AF-SFM-160-GD 5.71E+04 1.49E+04 6.60E+06 6.81E+02 3.56E+03 3.24E+04 3.35E+04 9.99E+03 0.0257 B1-01100AF-SFM-161-GD 1.44E+05 2.82E+04 1.25E+07 1.72E+03 0.00E+00 8.19E+04 3.37E+04 2.06E+04 0.0535

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 21 (continued) - Unit 1 Containment Above 565 ft. Elevation - Measured Concentrations of ROC for FSS H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 OpSOF MEASUREMENT ID (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

B1-01100AF-SFM-162-GD 7.02E+05 1.03E+05 4.54E+07 8.38E+03 1.33E+04 3.99E+05 2.95E+04 1.49E+04 0.2299 B1-01100AF-SFM-163-GD 2.75E+05 5.51E+04 2.43E+07 3.28E+03 1.17E+04 1.56E+05 4.17E+04 3.47E+04 0.1055 B1-01100AF-SFM-164-GD 1.16E+05 2.81E+04 1.24E+07 1.38E+03 0.00E+00 6.57E+04 2.85E+04 1.69E+04 0.0476 B1-01100AF-SFM-165-GD 7.38E+04 2.93E+04 1.30E+07 8.80E+02 3.37E+02 4.19E+04 1.95E+04 5.28E+03 0.0401 B1-01100AF-SFM-166-GD 1.39E+05 3.68E+04 1.62E+07 1.66E+03 1.51E+04 7.92E+04 5.75E+04 0.00E+00 0.0635 B1-01100AF-SFM-167-GD 2.35E+05 3.94E+04 1.74E+07 2.80E+03 6.01E+03 1.33E+05 4.98E+03 1.22E+04 0.0816 B1-01100AF-SFM-168-GD 5.14E+05 1.09E+05 4.84E+07 6.13E+03 9.89E+03 2.92E+05 7.90E+04 9.87E+03 0.1986 B1-01100AF-SFM-169-GD 2.42E+05 4.70E+04 2.08E+07 2.88E+03 8.54E+03 1.37E+05 6.99E+04 6.19E+04 0.0924 B1-01100AF-SFM-170-GD 4.57E+05 1.14E+05 5.02E+07 5.45E+03 0.00E+00 2.60E+05 3.87E+04 4.46E+04 0.1884 B1-01100AF-SFM-171-GD 6.89E+05 1.41E+05 6.23E+07 8.22E+03 1.59E+04 3.91E+05 3.86E+04 3.30E+04 0.2609 B1-01100AF-SFM-172-GD 7.67E+05 1.49E+05 6.58E+07 9.15E+03 4.83E+03 4.36E+05 1.06E+05 2.26E+04 0.2815 B1-01100AF-SFM-173-GD 5.20E+05 5.77E+05 2.55E+08 6.21E+03 5.96E+04 2.96E+05 3.21E+06 1.28E+05 0.6749 B1-01100AF-SFM-174-GD 1.63E+04 7.40E+03 3.27E+06 1.95E+02 6.42E+02 9.28E+03 7.23E+03 2.71E+03 0.0099 B1-01100AF-SFM-175-GD 2.62E+04 4.07E+04 1.80E+07 3.12E+02 0.00E+00 1.49E+04 1.22E+04 6.24E+03 0.0401 Note (1) The surrogate OpDCGL for Cs-137 (inferring both H-3 and Sr-90 at the maximum ratios from LTP Table 5-15) is 2.88E+06 pCi/m2 (Equation 2) and the surrogate OpDCGL for Co-60 (inferring Ni-63 at the maximum ratio from LTP Table 5-15) is 1.18E+06 pCi/m2 (Equation 3). No ISOCS measurement result for Cs-137 or Co-60 exceeded its respective surrogate OpDCGL value.

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 22 - Unit 1 Containment Above 565 ft. Elevation - Statistical Quantities - Systematic Measurement Population Individual Measurement Metrics Total Number of Systematic Measurements = 164 Number of Quality Control Measurements = 9 Number of Judgmental/Investigational Measurements = 0 Total Number of Measurements = 173 Mean Systematic Measurement SOF = 0.1238 Max Individual Systematic Measurement SOF = 1.1535 Number of Systematic Measurements with SOF >1 = 1 Statistical Quantities - Systematic Measurement Population MEAN MEDIAN MAX MIN BcDCGL Avg Dose Avg SOF ROC per ROC (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) per ROC (mrem/yr)

H-3 2.80E+05 2.19E+05 1.60E+06 1.63E+04 2.48E+05 2.38E+08 0.0012 0.0294 Co-60 7.40E+04 4.71E+04 9.01E+05 7.40E+03 9.91E+04 1.57E+08 0.0005 0.0118 Ni-63 3.27E+07 2.08E+07 3.98E+08 3.27E+06 4.38E+07 4.02E+09 0.0081 0.2035 Sr-90 3.34E+03 2.62E+03 1.90E+04 1.95E+02 2.96E+03 1.43E+06 0.0023 0.0584 Cs-134 9.55E+03 6.90E+03 6.29E+04 0.00E+00 1.07E+04 3.01E+07 0.0003 0.0079 Cs-137 1.59E+05 1.25E+05 9.07E+05 9.28E+03 1.41E+05 3.94E+07 0.0040 0.1009 Eu-152 1.28E+05 3.17E+04 5.71E+06 0.00E+00 5.62E+05 3.66E+08 0.0003 0.0087 Eu-154 3.40E+04 1.93E+04 5.65E+05 0.00E+00 6.70E+04 3.19E+08 0.0001 0.0027 SOF ASSIGNED TO SURVEY UNIT (SYSTEMATIC AVG.) = 0.0169

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 ADJUSTMENT TO SOFB FROM ELEVATED AREAS (>OPERATIONAL DCGL)

An adjustment is required for the area identified as an elevated area if an ISOCS measurement is greater than the Operational DCGL but less than the Base Case DCGL.

An elevated measurement was identified at location B1-01100A-FSFM-126-GD. The adjusted SOF for that ISOCS measurement was calculated using Equation 2 as follows:

Equation 6 Mean ConcB H-3 = 2.80E+05 pCi/m2 Base Case DCGLB H-3= 2.38E+08 pCi/m2 Mean ConcB Co-60 = 7.40E+04 pCi/m2 Base Case DCGLB Co-60= 1.57E+08 pCi/m2 Mean ConcB Ni-63 = 3.27E+07 pCi/m2 Base Case DCGLB Ni-63= 4.02E+09 pCi/m2 Mean ConcB Sr-90 = 3.34E+03 pCi/m2 Base Case DCGLB Sr-90= 1.43E+06 pCi/m2 Mean ConcB Cs-134 = 9.55E+03 pCi/m2 Base Case DCGLB Cs-134= 3.01E+07 pCi/m2 Mean ConcB Cs-137 = 1.59E+05 pCi/m2 Base Case DCGLB Cs-137= 3.94E+07 pCi/m2 Mean ConcB Eu-152 = 1.28E+05 pCi/m2 Base Case DCGLB Eu-152= 3.66E+08 pCi/m2 Mean ConcB Eu-154 = 3.40E+04 pCi/m2 Base Case DCGLB Eu-154= 3.19E+08 pCi/m2 SASU = 2,465 m2 SAElev = 28 m2 Elevated Area #1 - (B1-01100A-FSFM-126-GD)

Elev Conc1 H-3 = 1.30E+06 pCi/m2 SOF1H-3 = 0.00005 Elev Conc1 Co-60 = 9.01E+05 pCi/m2 SOF1Co-60 = 0.00006 Elev Conc1 Ni-63 = 3.98E+08 pCi/m2 SOF1Ni-63 = 0.00103 Elev Conc1 Sr-90 = 1.55E+04 pCi/m2 SOF1Sr-90 = 0.00010 Elev Conc1 Cs-134 = 5.83E+04 pCi/m2 SOF1Cs-134 = 0.00002 Elev Conc1 Cs-137 = 7.37E+05 pCi/m2 SOF1Cs-137 = 0.00017 Elev Conc1 Eu-152 = 5.71E+06 pCi/m2 SOF1Eu-152 = 0.00017 Elev Conc1 Eu-154 = 2.74E+05 pCi/m2 SOF1Eu-154 = 0.00001 SOF1 = 0.00160

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 The SOF1 (0.00160) from the elevated measurement (B1-01100AF-SFM-126-GD) was added to the mean SOF from the systematic measurements (0.0169) for an adjusted mean SOF for the survey unit of 0.0185. This equates to a dose of 0.4635 mrem/yr.

Unit 1 Containment Under Vessel Area Direct measurement locations were denoted on the remaining concrete and/or on the exposed steel liner in the Unit 1 Containment Under Vessel area by marking an approximate 4 meter by 4 meter grid pattern using a random start point that was overlaid over the exposed surface, providing sufficient overlap between locations to ensure 100%

areal coverage. See Figure 15 for a depiction of all measurement locations.

The systematic sample population consisted of sixty (60) direct measurements that were acquired using the ISOCS. A summary of the results of the 60 ISOCS measurements taken for non-parametric statistical testing results is provided in Table 24.

Concentrations of HTD ROC were not inferred. However, The surrogate OpDCGL for Cs-137 (inferring both H-3 and Sr-90 at the maximum ratios from LTP Table 5-15) equaled 2.10E+07 pCi/m2 (Equation 4) and the surrogate OpDCGL for Co-60 (inferring Ni-63 at the maximum ratio from LTP Table 5-15) equaled 8.55E+06 pCi/m2 (Equation 5). No ISOCS measurement result for Cs-137 or Co-60 exceeded its respective surrogate OpDCGL value.

As stated in the April 10, 2018 letter to the NRC, ZSRP presented evidence that the use of surrogate ratios to infer concentrations of HTD ROC in the Under Vessel concrete was no longer defensible. ZSRP believed that demonstrating compliance based on dose consequence from the actual measured concentrations for HTD ROC was a more reasonable approach as the spatial distribution of the concrete cores is representative and, due to the extensive remediation and removal of source term, particularly Cs-137, the ratios used to infer H-3 and Sr-90 using the Cs-137 as a surrogate were no longer consistent or reasonably correlated. ZSRP proposed an area-specific alternate approach to use the actual measured concentration of each HTD ROC to derive HTD concentrations for demonstrating compliance in the end-state concrete. This is allowed under LTP Chapter 5, section 5.2.11 which states, the area specific ratios as determined by actual survey data will be used in lieu of the maximum ratios presented in Table 5-15. The area-specific ratios used and the survey data serving as the basis for the ratios will be documented in the release record for the survey unit.

The maximum SOF derived for each measured HTD ROC was summed to provide a SOF that represented the worst-case dose consequence from the presence of HTD ROC at the measured concentrations in the concrete core samples. Use of the maximum concentration compensated for the additional source term at depth and accounted for any additional, unspecified variability. The summation of the maximum SOF resulted in a value of

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 0.3991. This value was then added to each of the measured SOF for the gamma emitting ROC. The combined SOF (including the addition of the maximum SOF for HTD) for each measurement was then used as the sum value for the Sign Test.

The mean measured concentration for each ROC was then compared to their respective Base Case DCGLs to calculate dose in mrem/yr. The mean SOF, calculated based on the mean measured concentration for each ROC (including HTD ROC) equaled 0.1955, which equates to a mean dose of 4.8881 mrem/yr.

The complete ISOCS gamma spectroscopy reports are presented in Attachment 6. A summary of the results of the 60 ISOCS measurements taken for non-parametric statistical testing results is provided in Table 24. The basic statistics for the systematic measurements are summarized in Table 25.

On April 16, 2018, the NRC commenced a confirmatory survey of the Unit 1 Containment basement FSS unit through Oak Ridge Institute for Science and Education (ORISE). The confirmatory survey consisted of several ISOCS measurements and additional concrete core samples. Upon review of the results, the NRC expressed concern pertaining to measured activity for H-3 in certain concrete core samples extrapolated over a 6-inch depth verses a 1/2-inch depth and the potential to exceed the Base Case DCGL in that scenario. For Unit 1, the concrete cores of concern were locations ORISE UV 4 and Zion location 19.

To address the NRCs concerns, ZSRP agreed to remove a minimum of 1 to 4 inches of additional concrete from around the location of these cores. For Unit 1 Containment, the area was designated as ISOCS location 19 (inclusive of the 1 ORISE sample). See Figure 16 for a depiction of the ORISE concrete core sample locations.

ZSRP commenced removal of the additional concrete commencing on 07/28/18. Due to the location of where the concrete was physically located, it was more effective to removal all the concrete exposing the steel liner in and around the upper circular wall.

Consequently, the concrete was completely removed down to the steel liner in ISOCS location #s 016 and 018. Post ORISE remediation core samples were collected from ISOCS location #s 015 and 020. During the execution of this evolution, ZSRP controlled the spread of concrete dust, wiped down adjacent areas after concrete removal and performed an extensive post-work contamination survey. All survey results indicted no detectable loose surface contamination

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 14 - Unit 1 Under Vessel Concrete H-3 Concrete Remediation Area Following the completion of this evolution, it was agreed to acquire and analyze two concrete core samples from each of the ISOCS zones that were remediated. As no concrete remained in location #s 016 and 018, no concrete core samples were acquired in these locations. In location #15 and #20, two concrete core samples were acquired on 07/28/18 under NRC observation. The results are presented in Table 25. Upon completion of the sampling, the NRC provided permission to backfill the Unit 1 Containment.

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 15 - Unit 1 Containment Under Vessel FSS Measurement Locations

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 23 - Unit 1 Containment Under Vessel Area - Measured Concentrations of ROC for FSS Co-60 Cs-134 Cs-137 Eu-152 Eu-154 OpSOF MEASUREMENT ID (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

B1-01110AF-SFC-001-GD 8.28E+04 0.00E+00 2.81E+06 5.16E+05 3.16E+05 0.0745 B1-01110AF-SFC-002-GD 2.97E+05 0.00E+00 8.93E+05 1.44E+06 8.93E+05 0.0315 B1-01110AF-SFC-003-GD 3.74E+06 8.48E+04 5.47E+06 1.32E+07 7.35E+05 0.2051 B1-01110AF-SCC-004-GD 6.36E+05 0.00E+00 5.90E+05 3.64E+06 7.92E+04 0.0294 B1-01110AF-SFC-005-GD 1.66E+05 1.53E+04 3.64E+06 1.33E+05 5.44E+04 0.0950 B1-01110AF-SFC-006-GD 2.65E+05 0.00E+00 7.88E+06 5.21E+05 3.52E+05 0.2053 B1-01110AF-SFC-007-GD 1.65E+05 3.45E+03 1.23E+07 4.69E+05 2.68E+03 0.3174 B1-01110AF-SWC-008-GD 2.95E+05 4.34E+04 8.22E+06 9.38E+05 6.58E+05 0.2176 B1-01110AF-SWC-009-GD 1.30E+06 0.00E+00 8.44E+06 6.92E+06 3.65E+05 0.2437 B1-01110AF-SWC-010-GD 2.35E+06 5.54E+05 1.45E+06 8.84E+06 5.25E+05 0.0964 B1-01110AF-SWC-011-GD 2.13E+05 3.51E+04 1.85E+06 1.09E+06 6.07E+04 0.0530 B1-01110AF-SWC-012-GD 1.10E+05 0.00E+00 1.14E+07 5.89E+05 1.05E+05 0.2926 B1-01110AF-SWC-013-GD 3.10E+04 5.52E+04 5.79E+05 1.44E+05 1.13E+05 0.0176 B1-01110AF-SCC-014-GD 3.30E+06 1.02E+04 1.51E+06 3.11E+07 1.27E+06 0.1494 B1-01110AF-SWC-015-GD 2.95E+06 1.77E+05 8.97E+06 1.61E+07 7.20E+05 0.3004 B1-02110AF-SWC-016-GD 2.45E+06 1.21E+05 3.98E+05 2.35E+07 8.53E+05 0.0971 B1-01110AF-SWC-017-GD 2.64E+06 2.79E+04 1.41E+06 1.36E+07 6.27E+05 0.0931 B1-01110AF-SWC-018-GD 3.90E+06 0.00E+00 8.23E+05 3.60E+07 1.40E+06 0.1494 B1-01110AF-SWC-019-GD 2.16E+06 1.61E+05 1.76E+06 1.22E+07 6.91E+05 0.0997 B1-01110AF-SWC-020-GD 3.85E+06 6.05E+03 1.29E+06 3.17E+07 1.49E+06 0.1495 B1-01110AF-SWC-021-GD 3.84E+06 9.54E+05 4.66E+06 1.21E+07 5.56E+05 0.2104 B1-01110AF-SWC-022-GD 3.27E+05 1.03E+04 1.75E+06 5.49E+05 4.10E+05 0.0499 B1-01110AF-SWC-023-GD 6.83E+05 0.00E+00 1.72E+06 1.83E+06 1.67E+06 0.0585 B1-01110AF-SWC-024-GD 2.17E+06 2.91E+05 5.21E+05 8.49E+06 6.29E+05 0.0622 B1-01110AF-SWC-025-GD 9.88E+04 3.46E+04 9.35E+06 7.96E+04 2.50E+05 0.2413 B1-01110AF-SWC-026-GD 1.20E+05 0.00E+00 1.29E+07 1.73E+05 5.41E+05 0.3317 B1-01110AF-SWC-027-GD 1.39E+05 5.33E+04 6.93E+06 7.61E+05 1.98E+05 0.1821 B1-01110AF-SWC-028-GD 1.67E+05 2.33E+04 3.88E+06 5.47E+05 5.98E+05 0.1043 B1-01110AF-SWC-029-GD 1.82E+05 1.32E+04 3.28E+06 7.29E+05 3.51E+05 0.0885 B1-01110AF-SWC-030-GD 1.91E+05 0.00E+00 4.21E+06 5.57E+05 5.29E+05 0.1117

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 23 (continued) - Unit 1 Containment Under Vessel Area - Measured Concentrations of ROC for FSS Co-60 Cs-134 Cs-137 Eu-152 Eu-154 OpSOF MEASUREMENT ID (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

B1-01110AF-SWC-031-GD 1.55E+05 0.00E+00 5.97E+06 3.52E+05 9.36E+04 0.1546 B1-01110AF-SWC-032-GD 1.43E+05 4.23E+03 1.32E+07 2.42E+04 2.70E+05 0.3388 B1-01110AF-SWC-033-GD 8.48E+04 0.00E+00 4.64E+06 1.75E+05 2.76E+05 0.1204 B1-01110AF-SWC-034-GD 1.47E+05 0.00E+00 2.44E+06 4.19E+05 6.24E+05 0.0663 B1-01110AF-SWC-035-GD 2.13E+05 5.06E+04 3.64E+06 6.14E+05 3.24E+05 0.0986 B1-01110AF-SWC-036-GD 1.98E+05 5.81E+04 5.30E+06 7.33E+05 1.55E+05 0.1409 B1-01110AF-SFC-037-GD 1.30E+05 4.31E+04 4.24E+06 0.00E+00 9.45E+04 0.1108 B1-01110AF-SWC-038-GD 1.61E+05 0.00E+00 6.36E+06 2.41E+05 1.94E+04 0.1640 B1-01110AF-SWC-039-GD 1.48E+05 1.12E+05 5.37E+06 1.15E+05 1.46E+05 0.1424 B1-01110AF-SWC-040-GD 3.11E+05 6.07E+04 9.24E+06 3.71E+05 4.84E+04 0.2408 B1-01110AF-SWC-041-GD 2.44E+05 4.05E+04 8.28E+06 3.94E+05 0.00E+00 0.2152 B1-01110AF-SWC-042-GD 3.08E+05 7.98E+04 8.93E+06 6.74E+05 5.00E+05 0.2360 B1-01110AF-SCC-043-GD 6.19E+04 3.38E+04 2.48E+06 1.11E+05 5.10E+04 0.0653 B1-01110AF-SCC-044-GD 5.89E+04 3.43E+04 8.61E+05 1.92E+05 2.12E+05 0.0247 B1-01110AF-SCC-045-GD 2.43E+05 7.23E+04 9.52E+05 1.12E+06 1.05E+06 0.0346 B1-01110AF-SWC-046-GD 2.92E+05 3.46E+03 4.50E+06 2.12E+06 1.57E+06 0.1277 B1-01110AF-SWC-047-GD 6.54E+05 5.97E+04 1.68E+06 3.62E+06 1.77E+05 0.0596 B1-01110AF-SWC-048-GD 2.60E+05 4.64E+03 2.93E+06 1.66E+06 8.10E+04 0.0813 B1-01110AF-SWC-049-GD 4.11E+05 1.68E+05 2.01E+06 2.51E+06 1.38E+06 0.0709 B1-01110AF-SWC-050-GD 1.79E+05 1.89E+04 2.51E+06 9.55E+05 3.38E+05 0.0694 B1-01110AF-SWC-051-GD 3.63E+05 1.15E+05 2.06E+06 1.70E+06 9.82E+05 0.0665 B1-01110AF-SWC-052-GD 2.14E+05 6.45E+03 1.78E+06 1.22E+06 7.90E+05 0.0528 B1-01110AF-SWC-053-GD 2.58E+05 4.26E+04 3.49E+06 1.24E+06 8.68E+05 0.0982 B1-01110AF-SWC-054-GD 6.00E+05 7.26E+04 3.95E+06 3.17E+06 1.05E+05 0.1160 B1-01110AF-SWC-055-GD 3.99E+05 1.16E+05 7.78E+06 1.72E+06 9.80E+04 0.2101 B1-01110AF-SWC-056-GD 4.11E+05 4.15E+04 2.52E+06 2.34E+06 1.16E+05 0.0752 B1-01110AF-SWC-057-GD 2.04E+05 1.96E+04 3.22E+06 8.63E+05 7.16E+05 0.0887 B1-01110AF-SWC-058-GD 3.98E+05 1.09E+05 3.74E+06 1.51E+06 6.52E+04 0.1059 B1-01110AF-SWC-059-GD 2.45E+05 3.77E+04 2.90E+06 1.17E+06 5.83E+05 0.0818 B1-01110AF-SFC-060-GD 1.39E+05 3.16E+04 4.48E+06 1.40E+05 4.47E+04 0.1166

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 24 - Unit 1 Containment Under Vessel Area - Statistical Quantities - Systematic Measurement Population Individual Measurement Metrics Total Number of Systematic Measurements = 60 Number of Quality Control Measurements = 3 Number of Judgmental/Investigational Measurements = 0 Total Number of Measurements = 63 Mean Systematic Measurement SOF = 0.1322 Max Individual Systematic Measurement SOF = 0.3388 Number of Systematic Measurements with SOF >1 = 0 Statistical Quantities - Systematic Measurement Population MEAN MEDIAN MAX MIN BcDCGL Avg Dose Avg SOF ROC per ROC (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2) per ROC (mrem/yr)

H-3 1.09E+07 3.87E+06 8.97E+07 1.01E+06 2.11E+07 2.38E+08 0.0459 1.1484 Co-60 7.74E+05 2.52E+05 3.90E+06 3.10E+04 1.13E+06 1.57E+08 0.0049 0.1233 Ni-63 4.81E+05 1.63E+05 1.42E+06 5.25E+04 5.29E+05 4.02E+09 0.0001 0.0030 Sr-90 2.57E+04 2.72E+04 2.88E+04 2.10E+04 4.09E+03 1.43E+06 0.0179 0.4486 Cs-134 6.85E+04 3.40E+04 9.54E+05 0.00E+00 1.45E+05 3.01E+07 0.0023 0.0569 Cs-137 4.37E+06 3.56E+06 1.32E+07 3.98E+05 3.35E+06 3.94E+07 0.1110 2.7744 Eu-152 4.33E+06 9.46E+05 3.60E+07 0.00E+00 8.12E+06 3.66E+08 0.0118 0.2959 Eu-154 4.80E+05 3.51E+05 1.67E+06 0.00E+00 4.35E+05 3.19E+08 0.0015 0.0376 SOF ASSIGNED TO SURVEY UNIT (SYSTEMATIC AVG.) = 0.1955

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Figure 16 - Unit 1 Containment Under Vessel ORISE FSS Confirmatory Locations

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Table 25 - Unit 1 Containment Under Vessel Area - Post H-3 Concrete Removal Concrete Core Results B1-01110A-IRW-C001-CV H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 Depth (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g)

Surface to 0.5 inch 8.80E+01 7.28E+00 6.94E+00 4.02E-01 -1.30E-01 1.30E+00 9.10E+01 3.56E+00 0.5 to 1 inch 6.14E+01 1.29E+01 5.71E-01 5.62E-01 -3.93E-01 -4.65E-02 1.12E+02 4.28E+00 1 to 1.5 inch 6.84E+01 6.90E+00 4.44E+00 5.99E-01 1.87E-01 9.56E-01 1.13E+02 5.38E+00 1.5 to 2 inch 5.15E+01 6.55E+00 7.98E-01 1.90E-01 1.52E-01 -6.81E-02 9.21E+01 4.53E+00 2 to 2.5 inch 6.71E+01 5.13E+00 2.23E+00 5.87E-01 4.06E-02 -3.04E-02 8.90E+01 3.63E+00 2.5 to 3 inch 7.69E+01 5.75E+00 1.78E+00 4.56E-01 2.21E-02 -7.12E-02 8.82E+01 2.43E+00 3 to 3.5 inch 4.99E+01 2.91E+00 8.40E-01 4.11E-01 3.51E-01 -1.56E-01 6.52E+01 9.98E-01 3.5 to 4 inch 5.22E+01 3.05E+00 7.14E-01 3.75E-01 -3.35E-02 -1.18E-01 5.65E+01 2.00E+00 4 to 4.5 inch 3.53E+01 4.71E+00 1.38E+00 -1.49E-01 -2.33E-01 1.68E-01 5.60E+01 3.02E+00 4.5 to 5 inch 4.20E+01 3.53E+00 7.60E-01 7.12E-01 -5.90E-01 2.92E-01 5.45E+01 2.44E+00 B1-01110A-IRW-C008-CV H-3 Co-60 Ni-63 Sr-90 Cs-134 Cs-137 Eu-152 Eu-154 Depth (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g) (pCi/g)

Surface to 0.5 inch 2.29E+02 7.72E+00 6.08E-01 2.86E-01 -1.01E-02 7.12E-01 1.37E+02 4.70E+00 0.5 to 1 inch 1.59E+02 5.58E+00 1.96E+02 3.80E-01 1.04E-01 7.36E-02 9.62E+01 3.92E+00 1 to 1.5 inch 1.41E+02 4.84E+00 7.02E+00 1.64E-01 -1.21E-01 -3.27E-03 8.52E+01 2.97E+00 1.5 to 2 inch 1.43E+02 3.45E+00 6.07E+00 -6.80E-01 1.74E-01 -7.35E-02 7.22E+01 2.17E+00 2 to 2.5 inch 1.22E+02 3.80E+00 3.89E+01 5.56E-01 -8.73E-02 -7.62E-02 6.66E+01 2.58E+00 2.5 to 3 inch 9.43E+01 3.39E+00 2.76E+00 -1.18E-01 -2.94E-01 4.55E-03 5.83E+01 1.28E+00 3 to 3.5 inch 8.07E+01 2.61E+00 5.06E+00 6.28E-01 3.44E-02 4.36E-02 6.25E+01 1.95E+00 3.5 to 4 inch 3.43E+01 3.31E+00 1.32E+00 3.76E-01 -1.55E-01 3.92E-01 4.54E+01 1.73E+00 4 to 4.5 inch 3.65E+01 2.14E+00 -5.66E-01 2.41E-01 1.05E-01 -2.96E-01 3.35E+01 1.25E+00 4.5 to 5 inch 2.29E+02 7.72E+00 6.08E-01 2.86E-01 -1.01E-02 7.12E-01 1.37E+02 4.70E+00 5 to 5.5 inch 1.59E+02 5.58E+00 1.96E+02 3.80E-01 1.04E-01 7.36E-02 9.62E+01 3.92E+00

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

8. QUALITY CONTROL The implementation of required QC measures included the collection of three (3) additional ISOCS measurements in the Under Vessel area (Survey Unit #B1-01110) and nine (9) additional ISOCS measurements in the 565 ft. Elevation (Survey Unit #B1-01100) for replicate measurement analysis. The complete ISOCS gamma spectroscopy reports for the duplicate measurements are presented in Attachment 6. All duplicate ISOCS measurements met the required acceptance criteria. The completed Duplicate Sample Assessment Forms are included in Attachment 4 of this Release Record.

9. INVESTIGATION AND RESULTS The Unit 1 Containment Building was initially turned over to C/LT for performance of FSS in January of 2018. A walkdown by C/LT and the decommissioning contractor was conducted and, following completion of the initial turnover surveys, the Unit 1 Containment was deemed to be ready for FSS.

During the initial attempt to perform FSS, several ISOCS measurement on the floor and walls of the Under Vessel area indicated a SOF greater than one (1) when compared against the Base Case DCGLs. The results of the initial survey indicated that further remediation was required in the Under Vessel area and the initial FSS was discarded.

Remediation was completed on March 1, 2018. The area was cleaned and turned over to the C/LT group for FSS. A walkdown and turnover survey was satisfactorily performed in both FSS units. Following the successful completion of the turnover surveys, the radiological conditions were deemed acceptable and the area was posted for FSS isolation and control.

10. REMEDIATION AND RESULTS As noted in Section 9 above, some remediation was required in the Under Vessel area prior to performance of FSS. Following remediation, FSS was conducted successfully and met all acceptance criteria for release of the survey units.

Chapter 4 of the ZSRP LTP states that remediation beyond that required to meet the release criteria is unnecessary and that the remaining residual radioactivity in structures was ALARA.

11. CHANGES FROM THE FINAL STATUS SURVEY PLAN In accordance with the LTP, compliance with the unrestricted release criteria is demonstrated though a series of static measurements taken with an ISOCS. LTP section

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 5.5.2.2, Table 5-19 lists the Unit 1 Containment Under Vessel area as a Class 1 basement structure survey unit with a total surface area of 294 m2 and the Unit 1 Containment above the 565 ft. elevation as a Class 1 basement structure survey unit with a total surface area of 2,465 m2. The FSS design specified to demonstrate compliance required a minimum of 155 static ISOCS measurements above the 565 ft. elevation, 19 static ISOCS measurements in the Under Vessel area and areal coverage of 100% in both survey units.

One hundred and sixty four (164) static ISOCS measurements and sixty (60) static ISOCS measurements were taken in the Unit 1 Containment Above 565 ft. Elevation and Under Vessel structural survey units respectively to ensure that 100% of the surface area was surveyed (the ISOCS Field-of-View [FOV] was overlapped to ensure that there were no un-surveyed corners and/or gaps). No judgmental measurements were taken. Replicate measurements were taken at nine (9) locations above the 565 ft. elevation and three (3) locations in the Under Vessel area that were selected at random (LTP section 5.9.3.1). In addition, a concrete core was required to be taken at 10% of the locations selected for an FSS ISOCS measurement (LTP section 5.1) which would require the acquisition of a minimum of six FSS Confirmatory (6) concrete cores in the Under Vessel area. All concrete was removed above the 565 ft. elevation. Consequently, no concrete core samples were acquired.

The LTP assumes that HTD concentrations will be inferred. Section 5.2.11 of the LTP states, During FSS, HTD concentrations will be inferred using a surrogate approach. Cs-137 is the principle surrogate radionuclide for H-3 and Sr-90 and Co-60 is the principle surrogate radionuclide for Ni-63. The maximum ratios used to infer HTD concentrations during compliance are presented in Table 5-15 from LTP section 5.2.11.

As previously stated, a concrete core was required to be taken at 10% of the locations selected for an FSS ISOCS measurement in the Unit 1 Containment Under Vessel area (LTP section 5.1) for a minimum of 6 concrete cores to be taken as part of the FSS. The purpose of the core samples was to ensure that the ratios used to infer the HTD concentrations remained valid. During the remediation process, it was acknowledged that the concrete surfaces that were represented by the continuing characterization concrete samples were remediated twice and the actual concrete that was sampled (original concrete surface to a depth of 1/2 inch) had been removed and disposed of as radioactive waste. At least a foot of concrete was removed from the Under Vessel floor and up to 6 inches of concrete removed from the walls.

Due to the amount of remediation that occurred on the Under Vessel concrete, ZSRP took an additional 19 concrete cores that represented the as-left condition of the Under Vessel concrete following concrete remediation. A review of the analysis of the post remediation concrete core data indicated that almost all of the ratios to Cs-137 for H-3

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 exceeded 1.76 and all the positive results for Sr-90 exceeded 0.021, which are the maximum ratios from LTP section 5.2.11, Table 5-15. A review of the results clearly show that the cause can be attributed to the fact that the majority of the less soluble source term activity for Cs-137 was contained with the near surface concrete that was remediated and removed (within a minimum of 6 inches) while the more soluble ROC (H-3 and Sr-90), while present in lesser concentrations that present in the pre-remediated concrete, have become the dominant radionuclide in the relationship with Cs-137. Due to the significant reduction in the concentrations of the gamma emitting ROC (many at MDC),

the H-3 and Sr-90 concentrations are not well correlated with Cs-137 and the use of a ratio with Cs-137 to infer a concentration for the HTD was no longer defensible.

On April 4, 2018, ZSRP submitted a proposal to the NRC for an alternate approach to use the actual HTD concentrations from the 19 end-state cores to demonstrate compliance as opposed to surrogate ratios. ZSRP proposed to use measured concentrations of each HTD ROC in units of pCi/g for each of the nineteen (19) locations and, assuming a depth of 1/2 inch (1.27 cm) and a concrete density of 2.35 g/cm3, converting the concentrations to units of pCi/m2. While it was acknowledged that the depth of contamination for the HTD ROC was greater than 1/2 inch, it was also proposed to use the maximum concentration to conservatively compensate for the additional source term at depth. The concentration is then divided by its respective Operational DCGL to derive a SOF.

For the FSS of the Unit 1 Containment Under Vessel concrete, the maximum measured concentrations of H-3, Ni-63 and Sr-90 in the 19 concrete core samples were used to extrapolate a worst-case dose consequence of 9.98 mrem/yr or a SOF of 0.3391 from the presence of HTD ROC. As before, a SOF was calculated for each of the 64 ISOCS measurements however, only the gamma results were included. Instead of inferring concentrations for the HTD SOF using a surrogate, the maximum measured SOF of 0.3991 for HTD ROC was added to the SOF for the gamma results. Of the 64 measurements taken, no measurement exceeded a SOF of one. The SOF (including the addition of the maximum SOF of 0.3991 from HTD) for each measurement was used as the sum value for the Sign Test. Passing the Sign Test demonstrates that the mean activity for each ROC is less than the Operational DCGLB at a Type 1 decision error of 0.05. The sample data passed the Sign Test. The null hypothesis was rejected. Compliance with the dose-based unrestricted release criteria was again demonstrated in accordance with the process presented in the LTP as well as the proposed approach for accounting for the presence of HTD ROC.

The actual measured concentrations for HTD ROC were used in conjunction with the 60 ISOCS measurements taken on the undervessel concrete in Unit 1 Containment to demonstrate compliance. It should also be noted that the surrogate OpDCGL for Cs-137 (inferring both H-3 and Sr-90 at the maximum ratios from LTP Table 5-15) equaled

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 2.10E+07 pCi/m2 (Equation 4) and the surrogate OpDCGL for Co-60 (inferring Ni-63 at the maximum ratio from LTP Table 5-15) equaled 8.55E+06 pCi/m2 (Equation 5). An elevated measurement was identified at location B1-01100A-FSFM-126-GD (above the 565 ft. level). The resultant adjusted SOF (0.00160) was used in the Equation 6 calculation of the dose assigned to this survey unit (0.4635 mrem/yr).

ZSRP believes that demonstrating compliance based on dose consequence from the actual measured concentrations for HTD ROC is a reasonable approach as the spatial distribution of the concrete cores is representative and, due to the extensive remediation and removal of source term, particularly Cs-137, the ratios used to infer H-3 and Sr-90 using the Cs-137 as a surrogate are no longer consistent or reasonably correlated.

There were no addendums to the FSS plan, but there were changes made to the number and location of ISOCS shots in both the Under Vessel area and on the 565 ft. Elevation.

Additional ISOCS shots were required in the Under Vessel area due to space constraints that resulted in detector stand-off distances of less than the originally planned three (3) meters. In all cases, approved geometries using different stand-off distances were used to ensure 100% coverage of the surface of the survey units.

In the 565 ft. Elevation, the floor and lower walls were gridded using available plant drawings. In practice, some of the identified ISOCS measurement locations were not usable, and some additional locations were required. Adjustments were made to ensure 100% coverage of the surface of the survey unit.

Corrected drawings for both survey units, showing final locations of all ISOCS measurements are included in Attachment 1 of this Release Record.

12. DATA QUALITY ASSESSMENT (DQA)

The DQO sample design and data were reviewed in accordance with ZionSolutions procedure ZS-LT-300-001-004, Final Status Survey Data Assessment (Reference 14) for completeness and consistency. Documentation was complete and legible. Surveys and the collection of measurements were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class 1. The survey design had adequate power as indicated by the Retrospective Power Curve (see Attachment 5).

The analytical results of all ISOCS measurements were less than a SOF of one except for the ISOCS measurement from the 565 ft. Elevation noted earlier Although MARSSIM states that the Sign Test need not be performed in the instance that no measurements surpass the DCGL, the test was conducted to demonstrate coherence to the statistical principles of the DQO process. The Sign Test (Attachment 3) was performed on the data and compared to the original assumptions of the DQOs. The

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 evaluation of the Sign Test results clearly demonstrates that the survey unit passes the unrestricted release criteria, thus, the null hypothesis is rejected.

The preliminary data review consisted of calculating basic statistical quantities (e.g.,

mean, median, standard deviation). All data was considered valid including negative values, zeros, values reported below the MDC, and values with uncertainties that exceeded two standard deviations. The mean and median values for each ROC were well below the respective Operational DCGLs. Also, the retrospective power curve shows that a sufficient number of samples were collected to achieve the desired power. Therefore, the survey unit meets the unrestricted release criteria with adequate power as required by the DQOs.

The data for Co-60 and Cs-137 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. COMPLIANCE EQUATION There are four distinct source terms for the end-state at Zion: backfilled basements, soil, buried piping and groundwater. Demonstrating compliance with the dose criterion requires the summation of dose from the four source terms (see Equation 6-11 from LTP Chapter 6, section 6-17).

The final compliance dose will be calculated using Equation 6-11 after FSS has been completed in all survey units. The results of the FSS performed for each FSS unit will be reviewed to determine the maximum dose from each of the four source terms (e.g.,

basement, soil, buried pipe and existing groundwater if applicable) using the mean Base Case SOF of FSS systematic results plus the dose from any identified elevated areas. The compliance dose must be less than 25 mrem/yr. The dose contribution from each ROC is accounted for using the Base Case SOF (BcSOF) to ensure that the total dose from all ROC does not exceed the dose criterion.

The term for each Basement includes the dose contributions from wall and floor surfaces within the Basement, the dose contribution from embedded pipe within the Basement, the dose contribution from penetrations within the Basement and the dose contribution from concrete fill in the Basement when clean concrete debris was used as fill. Each (structural surfaces, embedded pipe and penetrations) are surveyed separately during FSS. The dose from clean concrete fill is predetermined in accordance with LTP Chapter 5, Table 5-16, which is conservatively based on a maximum allowable MDC of 5,000 dpm/100cm2. The

[97]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 dose from fill assigned to the Unit 1 Containment basement is 1.77 mrem/yr, which equates to a SOF of 0.0708.

After the FSS of all dose components in a given basement is complete and all dose component survey units pass the Sign Test, the SOF for each dose component is calculated using Equations 5-5 or 5-6 as applicable from LTP Chapter 5, section 5.5.4. For both the Unit 1 Containment FSS unit above the 565 ft. elevation and the Unit 1 Containment FSS unit in the Under Vessel area, there was one elevated area identified by the compliance survey (elevated areas are defined as areas exceeding the OpDCGL but less than the BcDCGL). Consequently, the BcSOF for the Unit 1 Containment above the 565 ft.

elevation was adjusted to 0.0185, which equates to a dose of 0.4635 mrem/yr, and the BcSOF for the Unit 1 Containment Under Vessel area is 0.1995, which equates to a dose of 4.8875 mrem/yr. As the DCGLs for both FSS units in Unit 1 Containment were derived on an area-weighted basis, the total BcSOF for Unit 1 Containment is a summation of the BcSOF for the area above the 565 ft. elevation and the BCSOF for the area Under Vessel area, which equates to a total BcSOF for the Unit 1 Containment structure of 0.2180 or a dose of 5.45 mrem/yr.

Basement surface area adjustments (i.e. increases) were applied to the DCGL calculation for certain basements to ensure that the DCGLs accounted for the contribution of residual radioactivity from basements/structures that cannot, on their own, support a water supply well but, were hydraulically connected to a basement that could support a well. In accordance with LTP section 5.5.6.1, this adjustment must be made to the Containment structural BcSOF due to its hydraulic conductivity with the SFP/Transfer Canal FSS unit.

Area weighting using Equation 5-8 from LTP Chapter 5, section 5.5.6.1 was used to sum the residual activity in the Unit 1 Containment structure and the SFP/Transfer Canal structure on an area-weighted basis. The BcSOF for the SFP/Transfer Canal is 0.0331.

The derivation of this value is documented in the Release Record for the SFP/Transfer Canal structure. LTP Chapter 5, section 5.5.6.1, Table 5-23 states that the total area for the Unit 1 Containment plus the area of the SFP/Transfer Canal is 3,482 m2 and the stand-alone area of the SFP/Transfer Canal is 723 m2. The result is provided in Equation 7.

Equation 7 723 (0.0331) = 0.0069 3482 The SOF of 0.0069 is added to the mean BcSOF for the Unit 1 Containment to derive the adjusted BcSOF of 0.2249 for the Unit 1 Containment basement structure. This equates to a dose of 5.6218 mrem/yr. The adjusted BcSOF for the Unit 1 Containment structure is then used in the following equation to calculate BcSOFBASEMENT for the Unit 1 Containment.

[98]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Equation 8

= + + +

where:

SOFBASEMENT = SOF (mean of FSS systematic results plus the dose from any identified elevated areas) for backfilled Basements SOFB = SOF for structural survey unit(s) within the Basement (mean of FSS systematic results plus the dose from any identified elevated areas)

SOFEP = SOF for embedded pipe survey unit(s) within the Basement (mean of FSS systematic results plus the dose from any identified elevated areas)

SOFPN = SOF for penetration survey unit(s) within the Basement (mean of FSS systematic results plus the dose from any identified elevated areas)

SOFCF = SOF for clean concrete fill (if applicable) based on maximum MDC during URS The variable for BcSOFPN for the Unit 1 Containment penetrations is 0.0398. The derivation of this value is documented in the Release Record for the Unit 1 Containment penetrations.

The value for embedded pipe in the Unit 1 Containment is from the In-Core Sump Discharge pipe and from the Unit 1 Tendon Tunnel 547 ft. Embedded Floor Drain Pipe.

From the Release Record for the Unit 1 Containment In-Core Sump Discharge Pipe, the BcSOFEP value is 0.0484 and from the Release Record for the Unit 1 Tendon Tunnel Floor Drain Pipe, the BcSOFEP value is 0.0004. The sum of the embedded pipe for Unit 1 Containment is 0.0488.

The BcSOFBASEMENT value for the Unit 1 Containment is then derived as follows; Equation 9

= 0.2249 + 0.0488 + 0.0398 + 0.0708 = 0.3843 The BcSOFBASEMENT for the Unit 1 Containment basement is 0.3843. This SOF equates to a dose of 9.6075 mrem/yr TEDE to an AMCG from residual radioactivity in the Unit 1 Containment basement.

[99]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

15. CONCLUSION Survey Units #B1-01100AF and #B1-01110AF have met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved. The EMC is not applicable to structural surfaces and remediation was successfully implemented.

All identified ROC were used for statistical testing to determine the adequacy of the survey unit for FSS. Evaluation of the data shows that none of the ROC concentration values exceed the Operational DCGL or any investigational levels; therefore, in accordance with the LTP Section 5.10, the survey units meet the release criterion.

The sample data passed the Sign Test. The null hypothesis was rejected. The Retrospective Power Curve showed that adequate power was achieved. The survey units are properly classified as Class 1.

The total mean BcSOF for the Unit 1 Containment basement structure is 0.2249, which is the sum of mean BcSOF from survey unit above 565 foot elevation plus the mean SOF from the Under Vessel area and adjusted to account for residual radioactivity in the SFP/Transfer Canal on an area-weighted basis. The total dose contribution from the Unit 1 Containment basement structure, including dose from penetrations, embedded pipe and fill is 9.6075 mrem/yr TEDE (BcSOFBASEMENT = 0.3843).

Survey Units # B1-01100AF and # B1-01110AF are acceptable for unrestricted release.

16. 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, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)

5. ZionSolutions TSD 17-004, Operational Derived Concentration Guideline Levels for FSS

6. Zion Station Historical Site Assessment (HSA)

7. ZionSolutions TSD 14-028, Radiological Characterization Report

8. ZionSolutions procedure ZS-LT-300-001-002, Survey Unit Classification

9. ZionSolutions TSD 11-001, Potential Radionuclides of Concern during the Decommissioning of Zion Station

[100]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

10. ZionSolutions TSD 14-019, Radionuclides of Concern for Soil and Basement Fill Model Source Terms

11. ZionSolutions TSD 14-022, Use of In-Situ Gamma Spectroscopy for Source Term Survey of End State Structures

12. ZionSolutions TSD 13-005, Unit 1 and Unit 2 Reactor Building Estimated End State Concrete and Liner Volumes and Surfaces Areas

13. ZionSolutions procedure ZS-LT-300-001-003, Isolation and Control for Final Status Survey

14. ZionSolutions procedure ZS-LT-300-001-004, Final Status Survey Data Assessment

17. ATTACHMENTS Attachment 1 - Figure and Maps Attachment 2 - ISOCS Geometry Attachment 3 - Sign Test Attachment 4 - QC Measurement Assessment Attachment 5 - Graphical Presentations Attachment 6 - Eberline Reports Attachment 7 - ISOCS Analytical Reports

[101]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 ATTACHMENT 1 FIGURES AND MAPS

[102]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 FIGURE 1 - UNDER VESSEL ISOCS GRID LOCATIONS - UNDER VESSEL WALL

[103]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 FIGURE 2 - UNDER VESSEL ISOCS GRID LOCATIONS - INCORE FLOOR

[104]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 FIGURE 3 - UNDER VESSEL ISOCS GRID LOCATIONS - INCORE TUNNEL CEILING

[105]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 FIGURE 4 - UNDER VESSEL ISOCS GRID LOCATIONS - INCORE TUNNEL NORTH WALL

[106]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 FIGURE 5 - UNDER VESSEL ISOCS GRID LOCATIONS - INCORE TUNNEL SOUTH WALL

[107]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 FIGURE 6 - UNDER VESSEL ISOCS GRID LOCATIONS - SLOPED TUNNEL FLOOR

[108]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 FIGURE 7 - UNDER VESSEL ISOCS GRID LOCATIONS - SLOPED TUNNEL CEILING

[109]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 FIGURE 8 - UNIT 1 CONTAINMENT FLOOR GRID

[110]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 FIGURE 9 - UNIT 1 CONTAINMENT WALL GRID

[111]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 ATTACHMENT 2 ISOCS Geometry

[112]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 TSD 14-022, Use of In-Situ Gamma Spectroscopy for Source Term Survey of End State Structures The efficiency calibration methods and results for the use of in-situ gamma spectroscopy (ISOCS) to perform FSS of the ZSRP end state structure basements is presented in ZionSolutions TSD 14-022, Use of In-Situ Gamma Spectroscopy for Source Term Survey of End State Structures. The following is relevant information pertaining to ISOCS geometry for FSS of the Containment basements that is reproduced from the TSD.

For survey planning purposes and the assessments provided in the TSD, the assumed configuration of the ISOCS system during FSS is a three meter distance from the surface to be measured with a 90 degree, 50 mm lead collimator. This results in a 28.3 m2 FOV. The source term geometry, concentration depth profile and areal distribution of the residual radioactivity in structures are required to generate efficiency curves (i.e., efficiency as a function of energy). The concrete cores obtained during characterization, continuing characterization and FSS confirmatory phase provide the necessary information regarding the distribution of activity with depth for each structure. The areal distribution is assumed to be uniform for the efficiency calibration.

Containment Above 565 ft. Elevation ISOCS Geometries For Final Status Surveys Section 3.7 of TSD 14-022 acknowledges the decommissioning approach for the Containment basements above the 565 ft. elevation to remove all concrete inside the liners in both Containments. The source term geometry for the containment basements above the 565 ft/

elevation will be a thin layer of surface contamination on the remaining exposed steel liner. The geometry used on the Containment steel liner walls and floors will be a circular plane (CP) geometry with a thin source thickness. A source thickness of 0.153 cm provides a bounding and conservative depth of contamination for the liner model.

[113]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

- - - - G A M M A S P E C T R U M A N A L Y S I S ***

Filename: C:\GENIE2K\CAMFILES\10216-012 7-31-13.CNF Report Generated On : 5/14/2015 10:14:45 AM Sample Title : CP_Containment_0.153_Steel Sample Description :

Sample Identification :

Sample Type : Steel Sample Geometry :

Peak Locate Threshold : 3.00 Peak Locate Range (in channels) : 50 - 8192 Peak Area Range (in channels) : 50 - 8192 Identification Energy Tolerance : 1.000 keV Sample Size : 1.000E+000 M^2 Sample Taken On :

Acquisition Started : 7/31/2013 @ 12:36:59 PM

[114]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Live Time : 900.0 seconds Real Time : 902.5 seconds Dead Time : 0.28 %

Energy Calibration Used Done On : 5/13/2013 Efficiency Calibration Used Done On : 5/11/2015 Efficiency ID : U1CT_.153_051115

- - - - P E A K A N A L Y S I S R E P O R T **

Detector Name: 5452 Sample

Title:

CP_Containment_0.153_Steel Peak Analysis Performed on: 5/14/2015 @ 10:14:44 AM Peak Analysis From Channel: 50 Peak Analysis To Channel: 8192 ROI Energy FWHM Net Peak Peak Net Peak Continuum Area No. start end centroid (keV) (keV) Area Counts Uncert.

1 336 345 340.40 84.83 1.14 3.61E+01 40.33 1.64E+02 2 946 961 954.82 238.59 1.15 8.72E+01 32.59 5.88E+01 3 2327 2336 2331.97 583.12 0.53 1.90E+01 16.02 2.00E+01 4 2639 2654 2644.80 661.36 0.86 4.23E+01 17.98 1.27E+01 5 5830 5852 5841.95 1460.50 1.21 2.08E+02 31.75 1.15E+01 M = First peak in a multiplet region m = Other peak in a multiplet region F = Fitted singlet Errors quoted at 2.000 sigma

- - - - N U C L I D E I D E N T I F I C A T I O N R E P O R T ***

Sample

Title:

CP_Containment_0.153_Steel Nuclide Library Used: C:\GENIE2K\CAMFILES\Zion_LiB.NLB

....................IDENTIFIED NUCLIDES.....................

Nuclide ID Energy Yield Activity Activity Name Confidence (keV) (%) (pCi/m2) Uncertainty

[115]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 K-40 0.985 1460.81* 10.67 8.89E+05 1.55E+05 Cs-137 0.986 661.65* 85.12 1.50E+04 6.63E+03 Tl-208 0.999 583.19 84.50 6.37E+03 5.42E+03 Pb-212 1.000 74.81 9.60 77.11 17.50 87.20 6.30 89.80 1.75 115.19 0.60 238.63* 44.60 3.43E+04 1.40E+04 300.09 3.41 Th-231 0.983 26.64 18.70 84.21* 8.00 7.05E+04 7.99E+04 89.95 1.25

= Energy line found in the spectrum.

@ = Energy line not used for Weighted Mean Activity Energy Tolerance : 1.000 keV Nuclide confidence index threshold = 0.30 Errors quoted at 2.000 sigma

[116]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

- - - - I N T E R F E R E N C E C O R R E C T E D R E P O R T ***

Nuclide Nuclide ID Weighted Mean Weighted Mean Name Confidence Activity Activity (pCi/m2) Uncertainty K-40 0.985 8.89E+05 1.55E+05 Cs-137 0.986 1.50E+04 6.63E+03 Tl-208 0.999 6.37E+03 5.42E+03 Pb-212 1.000 3.43E+04 1.40E+04 Th-231 0.983 7.05E+04 7.99E+04

? = nuclide is part of an undetermined solution X = nuclide rejected by the interference analysis

@ = nuclide contains energy lines not used in Weighted Mean Activity Errors quoted at 2.000 sigma

- - - - U N I D E N T I F I E D P E A K S****************

Peak Locate Performed on: 5/14/2015 @ 10:14:44 AM Peak Locate From Channel: 50 Peak Locate To Channel: 8192 Peak Energy Peak Size in Peak CPS Peak Tol.

No. (keV) Counts per Second % Uncertainty Type Nuclide All peaks were identified.

- - - - N U C L I D E M D A R E P O R T **

Detector Name: 5452 Sample Geometry:

Sample

Title:

CP_Containment_0.153_Steel Nuclide Library Used: C:\GENIE2K\CAMFILES\Zion_LiB.NLB Nuclide Energy Yield Line MDA Nuclide MDA Activity Dec. Level Name (keV) (%) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

+K-40 1460.81 10.67 1.06E+05 1.06E+05 8.89E+05 4.71E+04 Mn-54 834.83 99.97 6.62E+03 6.62E+03 1.88E+03 2.85E+03 Co-60 1173.22 100 3.76E+03 3.76E+03 -5.06E+03 1.33E+03 1332.49 100 8.45E+03 4.95E+03 3.64E+03 Nb-94 702.63 100 6.07E+03 5.78E+03 1.13E+03 2.61E+03 871.10 100 5.78E+03 1.92E+01 2.42E+03

[117]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 SN-113 255.12 1.93 3.03E+05 9.00E+03 6.53E+04 1.40E+05 391.69 64.90 9.00E+03 -2.70E+03 4.02E+03 Cs-134 475.35 1.46 3.61E+05 6.47E+03 8.19E+04 1.57E+05 563.23 8.38 6.47E+04 -2.48E+04 2.78E+04 569.32 15.43 3.97E+04 7.38E+03 1.74E+04 604.70 97.60 7.40E+03 2.96E+02 3.30E+03 795.84 85.40 6.47E+03 -2.91E+03 2.71E+03 801.93 8.73 8.56E+04 1.64E+04 3.76E+04 1038.57 1.00 5.70E+05 -1.04E+05 2.34E+05 1167.94 1.80 3.16E+05 -1.42E+05 1.28E+05 1365.15 3.04 1.34E+05 9.04E+03 4.76E+04

+Cs-137 661.65* 85.12 8.21E+03 8.21E+03 1.50E+04 3.63E+03

+Tl-208 583.19* 84.50 8.32E+03 8.32E+03 6.37E+03 3.71E+03 Bi-211 72.87 1.20 1.06E+06 6.96E+04 -4.79E+05 5.08E+05 351.10 12.20 6.96E+04 2.96E+04 3.24E+04 404.80 4.10 1.48E+05 2.16E+03 6.62E+04 426.90 1.90 3.04E+0 -8.13E+03 1.35E+05 831.80 3.30 1.71E+0 -4.11E+04 7.17E+04 Pb-211 404.80 3.00 2.02E+0 2.02E+05 2.96E+03 9.04E+04 427.10 1.40 4.21E+0 2.48E+04 1.87E+05 831.80 2.80 2.02E+0 -4.11E+04 8.45E+04 Bi-212 39.86 1.10 5.05E+0 5.88E+04 -1.74E+06 2.45E+06 727.17 11.80 5.88E+0 1.56E+04 2.58E+04 785.42 2.00 2.87E+0 -2.06E+05 1.21E+05 1620.56 2.75 1.64E+0 -3.10E+04 5.82E+04 Pb-212 74.81 9.60 1.42E+05 1.84E+04 1.52E+05 6.86E+04 77.11 17.50 6.24E+04 3.00E+03 2.99E+04 87.20 6.30 1.44E+05 2.78E+04 6.87E+04 89.80 1.75 4.21E+05 -1.53E+05 1.99E+05 115.19 0.60 1.15E+06 2.65E+05 5.44E+05 238.63* 44.60 1.84E+04 3.43E+04 8.65E+03 300.09 3.41 1.73E+05 -3.33E+04 7.88E+04 Bi-214 609.31 46.30 2.33E+04 2.33E+04 2.49E+04 1.08E+04 768.36 5.04 1.26E+05 4.90E+04 5.42E+04 806.17 1.23 5.62E+05 9.23E+04 2.45E+05 934.06 3.21 1.78E+05 2.03E+04 7.37E+04 1120.29 15.10 7.14E+04 2.33E+04 3.56E+04 3.22E+04 1155.19 1.69 3.11E+05 -7.60E+04 1.24E+05 1238.11 5.94 1.27E+05 -9.08E+03 5.41E+04 1280.96 1.47 5.03E+05 -2.89E+03 2.12E+05 1377.67 4.11 2.10E+05 1.40E+05 9.02E+04 1385.31 0.78 8.02E+05 -1.61E+05 3.24E+05 1401.50 1.39 5.10E+05 1.33E+05 2.11E+05 1407.98 2.48 2.71E+05 -5.15E+03 1.11E+05 1509.19 2.19 2.79E+05 2.66E+04 1.11E+05 1661.28 1.15 3.99E+05 0.00E+00 1.41E+05 1729.60 3.05 2.35E+05 3.74E+04 9.48E+04 1764.49 15.80 6.74E+04 2.88E+04 2.93E+04

[118]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 1847.44 2.12 3.00E+05 9.99E+04 1.62E+05 2118.54 1.21 0.00E+00 0.00E+00 0.00E+00 Pb-214 74.81 6.33 2.15E+05 2.42E+04 2.30E+05 1.04E+05 77.11 10.70 1.02E+05 4.91E+03 4.89E+04 87.20 3.70 2.45E+05 3.88E+04 1.17E+05 89.80 1.03 7.16E+05 -2.59E+05 3.38E+05 241.98 7.49 7.41E+04 -8.92E+03 3.39E+04 295.21 19.20 3.61E+04 1.32E+04 1.67E+04 351.92 37.20 2.42E+04 2.38E+04 1.13E+04 785.91 1.10 5.43E+05 -1.31E+05 2.31E+05 Ra-226 186.21 3.28 2.11E+05 2.10E+05 8.24E+04 9.88E+04 89.95 2.10 3.47E+05 3.67E+04 -1.98E+05 1.64E+05 93.35 3.50 2.39E+05 1.35E+05 1.14E+05 129.08 2.80 2.15E+05 1.98E+04 1.01E+05 209.28 4.40 1.46E+05 3.45E+04 6.81E+04 270.23 3.60 1.75E+05 7.57E+04 8.03E+04 327.64 3.20 2.01E+05 7.23E+04 9.19E+04 Ac-228 338.32 11.40 5.82E+04 1.83E+04 2.66E+04 409.51 2.13 2.96E+05 -1.32E+04 1.33E+05 463.00 4.40 1.77E+05 4.55E+04 8.07E+04 794.70 4.60 1.36E+05 -1.43E+04 5.81E+04 911.60 27.70 3.67E+04 3.26E+04 1.66E+04 964.60 5.20 1.46E+05 2.42E+04 6.33E+04 969.11 16.60 5.63E+04 3.01E+04 2.52E+04 1587.90 3.71 1.83E+05 7.77E+04 7.38E+04 Pa-234M 766.36 0.29 2.29E+06 6.68E+05 4.08E+05 9.97E+05 1001.03 0.84 6.68E+05 -1.95E+05 2.74E+05 Th-234 92.38 2.81 2.76E+05 2.76E+05 -1.33E+05 1.31E+05 92.80 2.77 2.94E+05 3.01E+04 1.40E+05 112.81 0.28 2.28E+06 -1.30E+06 1.07E+06 U-235 89.96 1.50 4.63E+05 1.23E+04 -2.78E+05 2.30E+05 93.35 2.50 3.35E+05 1.89E+05 2.30E+05 105.00 1.00 6.99E+05 3.07E+05 1.59E+05 109.14 1.50 4.81E+05 2.97E+05 3.30E+05 143.76 10.50 6.20E+04 7.46E+03 2.28E+05 163.35 4.70 1.03E+05 -7.82E+04 4.74E+04 185.71 54.00 1.23E+04 7.78E+02 5.76E+03 202.12 1.00 5.15E+05 -7.04E+04 2.36E+05 205.31 4.70 1.26E+05 1.03E+04 5.83E+04 59.54 36.30 4.04E+04 4.04E+04 -1.48E+04 1.94E+04

+ = Nuclide identified during the nuclide identification

= Energy line found in the spectrum

> = Calculated MDA is zero due to zero counts in the region or the region is outside the spectrum

@ = Half-life too short to be able to perform the decay correction

[119]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Containment Sump Geometries: Zion Reactor Building Cavity Flood Sump Efficiency The Unit 1 and Unit 2 Containment sumps located on the 565 ft. elevation that were modeled using Geometry Composer are mirror images of each other and separate geometries were not required. The sumps modeled were the Reactor Cavity Flood Sump and the Reactor Building Recirculation Sump. The sumps were modeled using the Room templates consisting of four sides and a bottom. The contamination was modeled as surface contamination where 10 percent of the surface activity was assumed to be associated with each of the four walls and 60 percent was expected to be contained on the floor of the sumps. A single geometry and source to detector distance was used for each sump model.

The Geometries are titled:

Zion Reactor Bldg Cavity Flood Sump

Zion Reactor Bldg Recirc Sump

[120]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

[121]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

[122]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

[123]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

[124]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Containment Under Vessel (In Core) ISOCS Geometries For Final Status Surveys General At the time that TSD 14-022 was developed, the decommissioning approach for the Under Vessel concrete for both Containment basements was complete removal. Consequently, the document assumed conditions similar to the exposed liner above the 565 ft. elevation. The approach was altered in late 2016 and it was decided to attempt to leave all concrete below the 565 ft. elevation in the Under Vessel area with residual radioactivity less than the DCGL as the end-state.

Additional remediation and subsequent core sampling was required to quantify the remaining residual radioactivity (including both gamma emitting and HTD ROC). The core sampling also defined the depth of contamination associated with the Under Vessel concrete and augments the information required for developing the geometry and subsequent efficiency for the ISOCS measurements.

Discussion For both Unit 1 and Unit 2 Containment Under Vessel concrete, the gamma and HTD results of the continuing characterization core sampling (see Tables 4 and 5 of this Release Record for data used for Unit 1 Containment) were examined to develop initial geometries for the ISOCS. These initial geometries were based on the available data and were conservative. The geometries used were modeled using the Exponential Circular Plane (ECP) template included as part of the Canberra Geometry Composer software and is described in TSD 14-022. The initial Under Vessel (In Core) geometry parameters are provided in Table A below.

Table A Under Vessel Initial Exponential Circular Plane Geometry Parameters Unit Analysis Depth of DRL*

Contamination (cm) (cm) 2 Total Average Activity 14.0 6.4 2 Weighted Fraction Average 17.8 8.6 1 Total Average Activity 16.5 8.1 1 Weighted Fraction Average 21.6 21.6

Depth Relaxation Length as described in TSD 14-022.

Based on Table A data, the more conservative geometry parameters were selected for the Unit 1 Under Vessel FSS Sample Plan. These included the Depth of Contamination at 17.8 cm and the Depth Relaxation Length (DRL) of 8.6 cm.

While surveys were being conducted in Unit 1 Under Vessel area, the data used to develop the parameters in Table A were reviewed. In order to be consistent with TSD 14-022, the depth of contamination is determined by examining the average activity and converting the lambda ()

value generated by curve fitting exponential functions to the core data and subsequently, into the

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 contamination depth and DRL value used with the ISOCS Exponential Circular Plane Template in Geometry Composer. TSD 14-022 (equation 3) defines lambda where:

ln(0.368) = = 1 1

=

This activity examination was performed using the most recent Under Vessel core data and the associated spreadsheets and graphs (see Under Vessel A2-1 and A2-2) present both the data and results. The curve fit activity was used to develop a chart of total activity over depth and the cumulative value at the 90 percentile activity was used to select the depth of contamination.

As shown in the spreadsheets in A2-1 and A2-2, the evaluation resulted in a depth of contamination for Containment Units 1 and 2 under vessel of 15.24 cm and a DRL of 6.9 cm.

Table B below presents the new parameter values based on using the total activity as described above.

Table B Revised Under Vessel Exponential Circular Plane Geometry Parameters Depth of DRL Unit Analysis Contamination (cm) (cm) 1 Total Average Activity 15.24 6.9 2 Total Average Activity 15.24 6.9 It was decided that instead of using the new parameter values in Table B to continue using the parameter values of 17.8 cm contamination depth and DRL of 8.6 cm in that the values are conservative, reasonable and prudent. Table C compares the Under Vessel geometry to the geometry created using the parameters in Table B for Co-60, Cs-137, Eu-152, Eu-154 and Eu-155. Table D compares the two geometries using the Sum of Fractions which is the approach used for data assessment and the final acceptance of FSS data.

For Under Vessel ISOCS measurements, four variations of the current geometry were used. The geometries variation is the source to detector distance of 1.0, 1.5, 2.0 and 3.0 meters. A2-5 presents the Geometry Composer parameters and efficiency associated with each of the geometries. The geometries are files used for Genie2000 Spectrum Analysis Software are named as followed:

3M90D_ECP_17.8cm.geo

2M90D_ECP_17.8cm.geo

1.5M90D_ECP_17.8cm.geo

1M90D_ECP_17.8cm.geo

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 In addition to the above geometries another was created for the Under Vessel sump. This geometry was designed using Geometry Composers Rectangular Plane template. The contamination was distributed over a depth of 17.8 centimeters and 10 layers. The first 7.62 cm was divided into 1.27 cm segments (6) and the remaining 10.16 cm was divided into 4 segments (layers 2.54 cm thick). The associated concrete puck(s) activity for each layer was included as the Relative Concentration.

Table C Difference Between the Under Vessel Geometry (UV) Used and Table B Geometry Nuclides UV Geometry* Geometry From (pCi/m2) Table B (pCi/m2)

Co-60 3.10E+06 2.80E+06 0.097 (9.7%)

Cs-137 4.14E+06 3.69E+06 0.109 (10.9%)

Eu-152 1.10E+07 9.70E+06 0.118 (11.8%)

Eu-154 4.30E+05 3.86E+05 0.102 (10.2%)

Eu-155 7.87E+05 6.75E+05 0.142 (14.2%)

Where current geometry parameter for depth is 17.8 cm and DRL is 8.6 cm; the file analyzed is from under vessel The Gamma Spectrum Analysis Reports used to create Table 3.0 are found in Attachment A2-3.

Table D Difference Between Under Vessel (UV) and Table B Geometry SOF UV Geometry* Geometry From SOF Table B SOF 0.597 0.536 0.102 (10.2%)

The SOF spreadsheet used to create Table 4.0 is found in Attachment A2-4.

As noted in both Tables C and D, the UV geometry which using a thicker depth of contamination (17.8 cm) and larger DRL (8.6 cm) is ten percent more conservative than the Table B geometries.

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Attachment 2A-1 Unit 1 --Under Vessel Core Results Core Results for Contamination Depth and DRL Parameters

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Attachment 2A-2 Unit 1 --Under Vessel Core Results Core Results for Contamination Depth and DRL Parameters

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Attachment 2A-3 Gamma Spectrum Analysis Reports for Table C

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Attachment 2A-4 Under Vessel Sum Of Fractions for Current and Activity Derived Geometry for Table D SYSTEMATIC ISOCS MEASUREMENTS FSS Unit B1-01110B-F Description Unit 1 Containment Under Vessel Classification 1 Type Structural Surface Area 294 m2 Location Measured Inferred Activity Operational FOV Fraction of Sample ID ID# ROC Activity Ratio Activity per ROC DCGL OpSOF OpDCGL (Grid No.) (m2) (pCi/m2) (pCi/m2) (pCi/m2) (pCi/m2)

B1-01110AF-SFC-003-GD 003 28 H-3 1.76 7.29E+06 7.29E+06 2.37E+08 3.08E-02 0.597 Co-60 3.10E+06 3.10E+06 1.56E+08 1.99E-02 Ni-63 442 1.37E+09 1.37E+09 4.00E+09 3.42E-01 Original Geometry Sr-90 0.021 8.70E+04 8.70E+04 1.42E+06 6.13E-02 3M90D 17.8cm 8.6cm Cs-134 1.64E+05 1.64E+05 2.99E+07 5.48E-03 Cs-137 4.14E+06 4.14E+06 3.92E+07 1.06E-01 Eu-152 1.10E+07 1.10E+07 3.64E+08 3.01E-02 Eu-154 4.30E+05 4.30E+05 3.17E+08 1.36E-03 B1-01110AF-SFC-003-GD 003 28 H-3 1.76 6.48E+06 6.48E+06 2.37E+08 2.74E-02 0.536 Co-60 2.80E+06 2.80E+06 1.56E+08 1.80E-02 Ni-63 442 1.24E+09 1.24E+09 4.00E+09 3.10E-01 Sr-90 0.021 7.74E+04 7.74E+04 1.42E+06 5.45E-02 3M90D 15.24cm 6.9cm Cs-134 1.45E+05 1.45E+05 2.99E+07 4.85E-03 Cs-137 3.68E+06 3.68E+06 3.92E+07 9.40E-02 Eu-152 9.70E+06 9.70E+06 3.64E+08 2.66E-02 Eu-154 3.86E+05 3.86E+05 3.17E+08 1.22E-03

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Attachment 2A-5 Under Vessel (In Core) Geometries (3M90D_ECP_17.8.geo)

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Attachment 2A-6 Under Vessel Geometries (Zion Unit 1 In-Core Tunnel Sump)

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 ATTACHMENT 3 SIGN TEST

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Sign Test - Unit 1 Containment Basement Above 565 ft. Elevation Survey Area 01100 Description Unit 1 Containment Survey Unit B1-01100A-F Description Area above 565 foot elevation Classification 1 Type I Error 0.05 Number of Measurements 164 SOF

1-Ws Sign (Ws) 1 0.1008 0.90 +1 2 0.0589 0.94 +1 3 0.0504 0.95 +1 4 0.1036 0.90 +1 5 0.1406 0.86 +1 6 0.0912 0.91 +1 7 0.1083 0.89 +1 8 0.0826 0.92 +1 9 0.1273 0.87 +1 10 0.0965 0.90 +1 11 0.0546 0.95 +1 12 0.1251 0.87 +1 13 0.1426 0.86 +1 14 0.0703 0.93 +1 15 0.0652 0.93 +1 16 0.0837 0.92 +1 17 0.0870 0.91 +1 18 0.0605 0.94 +1 19 0.0617 0.94 +1 20 0.0745 0.93 +1 21 0.1166 0.88 +1 22 0.0646 0.94 +1 23 0.0432 0.96 +1 24 0.1409 0.86 +1 25 0.0944 0.91 +1 26 0.0550 0.95 +1 27 0.0546 0.95 +1

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Sign Test - Unit 1 Containment Basement Above 565 ft. Elevation (continued)

SOF

1-Ws Sign (Ws) 28 0.0759 0.92 +1 29 0.0956 0.90 +1 30 0.0595 0.94 +1 31 0.0397 0.96 +1 32 0.1127 0.89 +1 33 0.1250 0.87 +1 34 0.0629 0.94 +1 35 0.0882 0.91 +1 36 0.1309 0.87 +1 37 0.1448 0.86 +1 38 0.0843 0.92 +1 39 0.0829 0.92 +1 40 0.1600 0.84 +1 41 0.1621 0.84 +1 42 0.1116 0.89 +1 43 0.1751 0.82 +1 44 0.1068 0.89 +1 45 0.0578 0.94 +1 46 0.1087 0.89 +1 47 0.1016 0.90 +1 48 0.7919 0.21 +1 49 0.2156 0.78 +1 50 0.1373 0.86 +1 51 0.2098 0.79 +1 52 0.2841 0.72 +1 53 0.0926 0.91 +1 54 0.1674 0.83 +1 55 0.1675 0.83 +1 56 0.0748 0.93 +1 57 0.0617 0.94 +1 58 0.1707 0.83 +1

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Sign Test - Unit 1 Containment Basement Above 565 ft. Elevation (continued)

SOF

1-Ws Sign (Ws) 59 0.1713 0.83 +1 60 0.0583 0.94 +1 61 0.0931 0.91 +1 62 0.2024 0.80 +1 63 0.2431 0.76 +1 64 0.0867 0.91 +1 65 0.0556 0.94 +1 66 0.1674 0.83 +1 67 0.1157 0.88 +1 68 0.0476 0.95 +1 69 0.3165 0.68 +1 70 0.1523 0.85 +1 71 0.2371 0.76 +1 72 0.0855 0.91 +1 73 0.1141 0.89 +1 74 0.1454 0.85 +1 75 0.2508 0.75 +1 76 0.2232 0.78 +1 77 0.1399 0.86 +1 78 0.0449 0.96 +1 79 0.1025 0.90 +1 80 0.1109 0.89 +1 81 0.0468 0.95 +1 82 0.0694 0.93 +1 83 0.1993 0.80 +1 84 0.2720 0.73 +1 85 0.0487 0.95 +1 86 0.0504 0.95 +1 87 0.0758 0.92 +1 88 0.3081 0.69 +1 89 0.2087 0.79 +1 90 0.0537 0.95 +1

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Sign Test - Unit 1 Containment Basement Above 565 ft. Elevation (continued)

SOF

1-Ws Sign (Ws) 91 0.0304 0.97 +1 92 0.1662 0.83 +1 93 0.2367 0.76 +1 94 0.0396 0.96 +1 95 0.0425 0.96 +1 96 0.0818 0.92 +1 97 0.1092 0.89 +1 98 0.0541 0.95 +1 99 0.0513 0.95 +1 100 0.0827 0.92 +1 101 0.2889 0.71 +1 102 0.2649 0.74 +1 103 0.0465 0.95 +1 104 0.0779 0.92 +1 105 0.0671 0.93 +1 106 0.1385 0.86 +1 107 0.5134 0.49 +1 108 0.1426 0.86 +1 109 0.0481 0.95 +1 110 0.0367 0.96 +1 111 0.1427 0.86 +1 112 0.1032 0.90 +1 113 0.0332 0.97 +1 114 0.0630 0.94 +1 115 0.1390 0.86 +1 116 1.1565 (0.16) -1 117 0.2072 0.79 +1 118 0.0422 0.96 +1 119 0.0709 0.93 +1 120 0.0460 0.95 +1 121 0.2473 0.75 +1 122 0.1899 0.81 +1

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Sign Test - Unit 1 Containment Basement Above 565 ft. Elevation (continued)

SOF

1-Ws Sign (Ws) 123 0.0747 0.93 +1 124 0.0299 0.97 +1 125 0.0372 0.96 +1 126 0.0574 0.94 +1 127 0.2115 0.79 +1 128 0.0798 0.92 +1 129 0.0401 0.96 +1 130 0.0227 0.98 +1 131 0.0274 0.97 +1 132 0.0851 0.91 +1 133 0.0932 0.91 +1 134 0.0312 0.97 +1 135 0.0370 0.96 +1 136 0.0352 0.96 +1 137 0.0338 0.97 +1 138 0.0413 0.96 +1 139 0.0380 0.96 +1 140 0.0261 0.97 +1 141 0.0750 0.93 +1 142 0.1644 0.84 +1 143 0.2179 0.78 +1 144 0.0338 0.97 +1 145 0.0422 0.96 +1 146 0.0426 0.96 +1 147 0.0259 0.97 +1 148 0.0281 0.97 +1 149 0.0257 0.97 +1 150 0.0535 0.95 +1 151 0.2299 0.77 +1 152 0.1055 0.89 +1 153 0.0476 0.95 +1 154 0.0401 0.96 +1

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Sign Test - Unit 1 Containment Basement Above 565 ft. Elevation (continued)

SOF

1-Ws Sign (Ws) 155 0.0635 0.94 +1 156 0.0816 0.92 +1 157 0.1986 0.80 +1 158 0.0924 0.91 +1 159 0.1884 0.81 +1 160 0.2609 0.74 +1 161 0.2815 0.72 +1 162 0.6749 0.33 +1 163 0.0099 0.99 +1 164 0.0401 0.96 +1 Number of positive differences (S+) 163 Critical Value 93 Survey Unit Meets the Acceptance Criteria

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Sign Test Unit 2 Containment Basement Under Vessel Area Survey Area 01100 Description Unit 1 Containment Survey Unit B1-01110A-F Description Undervessel Area Classification 1 Type I Error 0.05 Number of Measurements 60 HTDs Inferred Using Table 5-15 Ratios HTDs Inferred Max Measured HTD SOF of 0.3991 SOF SOF

1-Ws Sign # 1-Ws Sign (Ws) (Ws) 0 0.0745 0.93 +1 0 0.4736 0.53 +1 1 0.0315 0.97 +1 1 0.4305 0.57 +1 2 0.2051 0.79 +1 2 0.6041 0.40 +1 3 0.0294 0.97 +1 3 0.4285 0.57 +1 4 0.0950 0.90 +1 4 0.4941 0.51 +1 5 0.2053 0.79 +1 5 0.6043 0.40 +1 6 0.3174 0.68 +1 6 0.7165 0.28 +1 7 0.2176 0.78 +1 7 0.6166 0.38 +1 8 0.2437 0.76 +1 8 0.6428 0.36 +1 9 0.0964 0.90 +1 9 0.4955 0.50 +1 10 0.0530 0.95 +1 10 0.4521 0.55 +1 11 0.2926 0.71 +1 11 0.6917 0.31 +1 12 0.0176 0.98 +1 12 0.4166 0.58 +1 13 0.1494 0.85 +1 13 0.5485 0.45 +1 14 0.3004 0.70 +1 14 0.6994 0.30 +1 15 0.0971 0.90 +1 15 0.4962 0.50 +1 16 0.0931 0.91 +1 16 0.4922 0.51 +1 17 0.1494 0.85 +1 17 0.5485 0.45 +1 18 0.0997 0.90 +1 18 0.4988 0.50 +1 19 0.1495 0.85 +1 19 0.5486 0.45 +1 20 0.2104 0.79 +1 20 0.6094 0.39 +1 21 0.0499 0.95 +1 21 0.4490 0.55 +1 22 0.0585 0.94 +1 22 0.4575 0.54 +1 23 0.0622 0.94 +1 23 0.4613 0.54 +1 24 0.2413 0.76 +1 24 0.6404 0.36 +1 25 0.3317 0.67 +1 25 0.7308 0.27 +1 26 0.1821 0.82 +1 26 0.5812 0.42 +1 27 0.1043 0.90 +1 27 0.5034 0.50 +1 28 0.0885 0.91 +1 28 0.4876 0.51 +1 29 0.1117 0.89 +1 29 0.5108 0.49 +1 30 0.1546 0.85 +1 30 0.5537 0.45 +1 31 0.3388 0.66 +1 31 0.7379 0.26 +1 32 0.1204 0.88 +1 32 0.5194 0.48 +1 33 0.0663 0.93 +1 33 0.4653 0.53 +1 34 0.0986 0.90 +1 34 0.4977 0.50 +1

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Sign Test (continued) Unit 2 Containment Basement Under Vessel Area Survey Area 01100 Description Unit 1 Containment Survey Unit B1-01110A-F Description Undervessel Area Classification 1 Type I Error 0.05 Number of Measurements 0 HTDs Inferred Using Table 5-15 Ratios HTDs Inferred Max Measured HTD SOF of 0.3991 35 0.1409 0.86 +1 35 0.5399 0.46 +1 36 0.1108 0.89 +1 36 0.5099 0.49 +1 37 0.1640 0.84 +1 37 0.5631 0.44 +1 38 0.1424 0.86 +1 38 0.5414 0.46 +1 39 0.2408 0.76 +1 39 0.6399 0.36 +1 40 0.2152 0.78 +1 40 0.6143 0.39 +1 41 0.2360 0.76 +1 41 0.6351 0.36 +1 42 0.0653 0.93 +1 42 0.4643 0.54 +1 43 0.0247 0.98 +1 43 0.4238 0.58 +1 44 0.0346 0.97 +1 44 0.4337 0.57 +1 45 0.1277 0.87 +1 45 0.5267 0.47 +1 46 0.0596 0.94 +1 46 0.4587 0.54 +1 47 0.0813 0.92 +1 47 0.4803 0.52 +1 48 0.0709 0.93 +1 48 0.4699 0.53 +1 49 0.0694 0.93 +1 49 0.4685 0.53 +1 50 0.0665 0.93 +1 50 0.4655 0.53 +1 51 0.0528 0.95 +1 51 0.4519 0.55 +1 52 0.0982 0.90 +1 52 0.4973 0.50 +1 53 0.1160 0.88 +1 53 0.5151 0.48 +1 54 0.2101 0.79 +1 54 0.6091 0.39 +1 55 0.0752 0.92 +1 55 0.4743 0.53 +1 56 0.0887 0.91 +1 56 0.4878 0.51 +1 57 0.1059 0.89 +1 57 0.5050 0.50 +1 58 0.0818 0.92 +1 58 0.4809 0.52 +1 59 0.1166 0.88 +1 59 0.5157 0.48 +1 Number of positive differences (S+) 60 Number of positive differences (S+) 60 Critical Value 36 Critical Value 36 Survey Unit Meets the Acceptance Criteria Survey Unit Meets the Acceptance Criteria

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 ATTACHMENT 4 QC MEASUREMENT ASSESSMENT

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Above 565 ft Sample Plan#: B1-01100A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #36. The standard measurement was B1-01100AF-SWM-036-GD, the comparison sample was B1-01100AF-QWM-036-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 2.34E+05 3.72E+04 6.30 0.5 - 2.0 2.46E+05 3.77E+04 1.05 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the standard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

4/25/2018 2/28/2019

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Above 565 ft Sample Plan#: B1-01100A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #100. The standard measurement was B1-01100AF-SFM-100-GD, the comparison sample was B1-01100AF-QFM-100-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 2.82E+05 4.29E+04 6.57 0.5 - 2.0 2.70E+05 4.08E+04 0.96 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the standard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

4/25/2018 2/28/2019

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Above 565 ft Sample Plan#: B1-01100A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #100. The standard measurement was B1-01100AF-SFM-100-GD, the comparison sample was B1-01100AF-QFM-100-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 2.82E+05 4.29E+04 6.57 0.5 - 2.0 2.70E+05 4.08E+04 0.96 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the standard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

4/25/2018 2/28/2019

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Above 565 ft Sample Plan#: B1-01100A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #124. The standard measurement was B1-01100AF-SFM-124-GD, the comparison sample was B1-01100AF-QFM-124-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 9.43E+04 2.07E+04 4.57 0.5 - 2.0 7.59E+04 1.64E+04 0.81 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the standard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

4/25/2018 2/28/2019

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FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Above 565 ft Sample Plan#: B1-01100A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #125. The standard measurement was B1-01100AF-SFM-125-GD, the comparison sample was B1-01100AF-QFM-125-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 2.62E+05 4.20E+04 6.24 0.5 - 2.0 2.76E+05 4.45E+04 1.05 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the standard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

4/25/2018 2/28/2019

[171]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Above 565 ft Sample Plan#: B1-01100A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #143. The standard measurement was B1-01100AF-SFM-143-GD, the comparison sample was B1-01100AF-QFM-143-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 1.08E+05 2.24E+04 4.80 0.5 - 2.0 9.35E+04 2.11E+04 0.87 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the standard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

4/25/2018 2/28/2019

[172]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Above 565 ft Sample Plan#: B1-01100A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #146. The standard measurement was B1-01100AF-SFM-146-GD, the comparison sample was B1-01100AF-QFM-146-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 1.98E+04 1.20E+04 1.65 0.5 - 2.0 2.15E+04 1.32E+04 1.09 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the standard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

4/25/2018 2/28/2019

[173]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Above 565 ft Sample Plan#: B1-01100A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #150. The standard measurement was B1-01100AF-SFM-150-GD, the comparison sample was B1-01100AF-QFM-150-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Co-60 3.46E+04 1.25E+04 2.76 0.5 - 2.0 2.00E+04 7.32E+03 0.58 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the standard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

4/25/2018 2/28/2019

[174]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Above 565 ft Sample Plan#: B1-01100A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #153. The standard measurement was B1-01100AF-SFM-153-GD, the comparison sample was B1-01100AF-QFM-153-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 2.41E+05 3.71E+04 6.48 0.5 - 2.0 2.30E+05 3.68E+04 0.96 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the standard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

4/25/2018 2/28/2019

[175]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Undervessel Area Sample Plan#: B1-01110A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #6. The standard measurement was B1-01110AF-SFC-006-GD, the comparison sample was B1-01110AF-QFC-006-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 7.88E+06 9.68E+05 8.14 0.6 - 1.68 7.60E+06 9.35E+05 0.96 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the stadard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

3/28/2018 2/28/2019

[176]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Undervessel Area Sample Plan#: B1-01110A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #16. The standard measurement was B1-02110AF-SWC-016-GD, the comparison sample was B1-01110AF-QWC-016-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 3.98E+05 1.19E+05 3.34 0.5 - 2.0 4.95E+05 1.56E+05 1.25 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the stadard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

3/28/2018 2/28/2019

[177]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 Duplicate Sample Assessment Form Survey Unit #: 01100 Survey Unit # 01110 Survey Unit Name: Unit 1 Containment Undervessel Area Sample Plan#: B1-01110A-F Sample

Description:

Comparison of duplicate ISOCS measurements collected from measurement location #51. The standard measurement was B1-01110AF-SWC-051-GD, the comparison sample was B1-01110AF-QWC-051-GD.

STANDARD COMPARISON Activity Standard Agreement Activity Standard Comparison Acceptable Radionuclide Resolution Value Error Range Value Error Ratio (Y/N)

Cs-137 2.06E+06 2.71E+05 7.59 0.6 - 1.66 2.12E+06 2.83E+05 1.03 Y Comments/Corrective Actions: There was acceptable agreement between Table is provided to show acceptance criteria used to the stadard measurement and the replicate measurement. No further assess split samples.

action is necessary.

Performed by: D. Mihalik Date: Reviewed by: Date:

3/28/2018 2/28/2019

[178]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 ATTACHMENT 5 GRAPHICAL PRESENTATIONS

[179]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 QUANTILE PLOT FOR Co-60 Survey Unit: B1-01100A-F Survey Unit Name: Unit 1 Containment Above 565 ft Mean: 7.40E+04 pCi/m2 Quantile Plot For Co-60 1.00E+06 9.00E+05 8.00E+05 Concentration (pCi/m2) 7.00E+05 6.00E+05 5.00E+05 4.00E+05 3.00E+05 2.00E+05 1.00E+05 0.00E+00 0% 20% 40% 60% 80% 100%

Percentage

[180]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 RANK Co-60 % RANK Co-60 % RANK Co-60 % RANK Co-60 % RANK Co-60 % RANK Co-60 %

1 7.40E+03 0% 31 2.89E+04 19% 61 3.98E+04 37% 91 5.02E+04 55% 121 7.64E+04 73% 151 1.44E+05 92%

2 1.49E+04 1% 32 2.91E+04 19% 62 3.98E+04 38% 92 5.16E+04 56% 122 7.66E+04 74% 152 1.49E+05 92%

3 1.49E+04 2% 33 2.93E+04 20% 63 4.06E+04 38% 93 5.25E+04 56% 123 7.74E+04 75% 153 1.50E+05 93%

4 1.53E+04 2% 34 2.93E+04 20% 64 4.07E+04 39% 94 5.38E+04 57% 124 7.74E+04 75% 154 1.52E+05 94%

5 1.60E+04 3% 35 2.94E+04 21% 65 4.09E+04 39% 95 5.43E+04 58% 125 7.91E+04 76% 155 1.55E+05 94%

6 1.66E+04 3% 36 2.97E+04 22% 66 4.09E+04 40% 96 5.44E+04 58% 126 8.47E+04 77% 156 1.74E+05 95%

7 1.67E+04 4% 37 2.99E+04 22% 67 4.12E+04 41% 97 5.45E+04 59% 127 8.67E+04 77% 157 1.81E+05 95%

8 1.67E+04 5% 38 2.99E+04 23% 68 4.14E+04 41% 98 5.51E+04 59% 128 9.04E+04 78% 158 1.90E+05 96%

9 1.70E+04 5% 39 3.01E+04 23% 69 4.15E+04 42% 99 5.52E+04 60% 129 9.67E+04 78% 159 2.04E+05 97%

10 1.71E+04 6% 40 3.02E+04 24% 70 4.28E+04 42% 100 5.56E+04 61% 130 9.81E+04 79% 160 2.04E+05 97%

11 1.73E+04 6% 41 3.08E+04 25% 71 4.33E+04 43% 101 5.73E+04 61% 131 9.84E+04 80% 161 4.51E+05 98%

12 1.81E+04 7% 42 3.23E+04 25% 72 4.38E+04 44% 102 5.78E+04 62% 132 1.00E+05 80% 162 5.34E+05 98%

13 1.89E+04 8% 43 3.24E+04 26% 73 4.39E+04 44% 103 5.81E+04 63% 133 1.01E+05 81% 163 5.77E+05 99%

14 1.91E+04 8% 44 3.25E+04 27% 74 4.43E+04 45% 104 5.92E+04 63% 134 1.01E+05 81% 164 9.01E+05 100%

15 1.91E+04 9% 45 3.25E+04 27% 75 4.44E+04 45% 105 5.98E+04 64% 135 1.03E+05 82%

16 1.94E+04 9% 46 3.25E+04 28% 76 4.50E+04 46% 106 6.28E+04 64% 136 1.07E+05 83%

17 1.96E+04 10% 47 3.29E+04 28% 77 4.54E+04 47% 107 6.34E+04 65% 137 1.08E+05 83%

18 2.23E+04 11% 48 3.36E+04 29% 78 4.57E+04 47% 108 6.34E+04 66% 138 1.08E+05 84%

19 2.36E+04 11% 49 3.37E+04 30% 79 4.59E+04 48% 109 6.39E+04 66% 139 1.09E+05 84%

20 2.38E+04 12% 50 3.44E+04 30% 80 4.63E+04 48% 110 6.52E+04 67% 140 1.12E+05 85%

21 2.45E+04 13% 51 3.51E+04 31% 81 4.66E+04 49% 111 6.63E+04 67% 141 1.14E+05 86%

22 2.46E+04 13% 52 3.53E+04 31% 82 4.70E+04 50% 112 6.65E+04 68% 142 1.15E+05 86%

23 2.53E+04 14% 53 3.56E+04 32% 83 4.71E+04 50% 113 6.66E+04 69% 143 1.19E+05 87%

24 2.62E+04 14% 54 3.60E+04 33% 84 4.73E+04 51% 114 6.70E+04 69% 144 1.20E+05 88%

25 2.63E+04 15% 55 3.62E+04 33% 85 4.76E+04 52% 115 6.87E+04 70% 145 1.25E+05 88%

26 2.65E+04 16% 56 3.66E+04 34% 86 4.80E+04 52% 116 7.00E+04 70% 146 1.30E+05 89%

27 2.81E+04 16% 57 3.68E+04 34% 87 4.82E+04 53% 117 7.42E+04 71% 147 1.32E+05 89%

28 2.82E+04 17% 58 3.94E+04 35% 88 4.90E+04 53% 118 7.47E+04 72% 148 1.39E+05 90%

29 2.84E+04 17% 59 3.94E+04 36% 89 4.94E+04 54% 119 7.52E+04 72% 149 1.41E+05 91%

30 2.84E+04 18% 60 3.95E+04 36% 90 4.97E+04 55% 120 7.55E+04 73% 150 1.43E+05 91%

[181]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 HISTOGRAM FOR Co-60 Survey Unit: B1-01100A-F Survey Unit Name: Unit 1 Containment Above 565 ft Mean: 7.40E+04 pCi/m2 Median: 4.71E+04 pCi/m2 ST DEV: 9.91E+04 Skew: 5.43E+00 Frequency Plot For Co-60 90%

80%

70%

60%

Frequency 50%

40%

30%

20%

10%

0%

9.75E+04 2.78E+05 4.58E+05 6.38E+05 8.19E+05 Upper End Value (pCi/m2)

Observation Observation Upper Value Frequency %

9.75E+04 129 79%

1.88E+05 28 17%

2.78E+05 3 2%

3.68E+05 0 0%

4.58E+05 1 1%

5.48E+05 1 1%

6.38E+05 1 1%

7.29E+05 0 0%

8.19E+05 0 0%

9.09E+05 1 1%

TOTAL 164 100%

[182]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 QUANTILE PLOT FOR Cs-137 Survey Unit: B1-01100A-F Survey Unit Name: Unit 1 Containment Above 565 ft Mean: 1.59E+05 pCi/m2

[183]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 RANK Cs-137 % RANK Cs-137 % RANK Cs-137 % RANK Cs-137 % RANK Cs-137 % RANK Cs-137 %

1 9.28E+03 0% 31 4.89E+04 19% 61 8.16E+04 37% 91 1.34E+05 55% 121 2.15E+05 73% 151 3.58E+05 92%

2 1.49E+04 1% 32 4.97E+04 19% 62 8.17E+04 38% 92 1.37E+05 56% 122 2.17E+05 74% 152 3.91E+05 92%

3 1.78E+04 2% 33 5.06E+04 20% 63 8.19E+04 38% 93 1.40E+05 56% 123 2.20E+05 75% 153 3.99E+05 93%

4 1.83E+04 2% 34 5.16E+04 20% 64 8.20E+04 39% 94 1.40E+05 57% 124 2.22E+05 75% 154 3.99E+05 94%

5 1.85E+04 3% 35 5.22E+04 21% 65 8.45E+04 39% 95 1.43E+05 58% 125 2.23E+05 76% 155 4.05E+05 94%

6 1.98E+04 3% 36 5.29E+04 22% 66 8.46E+04 40% 96 1.44E+05 58% 126 2.26E+05 77% 156 4.16E+05 95%

7 2.01E+04 4% 37 5.35E+04 22% 67 8.46E+04 41% 97 1.48E+05 59% 127 2.30E+05 77% 157 4.27E+05 95%

8 2.70E+04 5% 38 5.46E+04 23% 68 8.76E+04 41% 98 1.48E+05 59% 128 2.32E+05 78% 158 4.28E+05 96%

9 3.20E+04 5% 39 5.53E+04 23% 69 9.01E+04 42% 99 1.48E+05 60% 129 2.34E+05 78% 159 4.36E+05 97%

10 3.22E+04 6% 40 5.61E+04 24% 70 9.43E+04 42% 100 1.56E+05 61% 130 2.34E+05 79% 160 4.67E+05 97%

11 3.24E+04 6% 41 5.65E+04 25% 71 9.47E+04 43% 101 1.56E+05 61% 131 2.36E+05 80% 161 4.74E+05 98%

12 3.42E+04 7% 42 6.04E+04 25% 72 9.56E+04 44% 102 1.64E+05 62% 132 2.38E+05 80% 162 7.37E+05 98%

13 3.46E+04 8% 43 6.05E+04 26% 73 9.83E+04 44% 103 1.66E+05 63% 133 2.41E+05 81% 163 7.67E+05 99%

14 3.56E+04 8% 44 6.10E+04 27% 74 9.84E+04 45% 104 1.68E+05 63% 134 2.42E+05 81% 164 9.07E+05 100%

15 3.71E+04 9% 45 6.18E+04 27% 75 1.00E+05 45% 105 1.69E+05 64% 135 2.49E+05 82%

16 3.74E+04 9% 46 6.30E+04 28% 76 1.06E+05 46% 106 1.70E+05 64% 136 2.50E+05 83%

17 3.78E+04 10% 47 6.34E+04 28% 77 1.08E+05 47% 107 1.70E+05 65% 137 2.60E+05 83%

18 3.82E+04 11% 48 6.57E+04 29% 78 1.11E+05 47% 108 1.74E+05 66% 138 2.62E+05 84%

19 4.17E+04 11% 49 6.60E+04 30% 79 1.12E+05 48% 109 1.83E+05 66% 139 2.62E+05 84%

20 4.19E+04 12% 50 6.62E+04 30% 80 1.18E+05 48% 110 1.83E+05 67% 140 2.72E+05 85%

21 4.39E+04 13% 51 6.66E+04 31% 81 1.21E+05 49% 111 1.86E+05 67% 141 2.82E+05 86%

22 4.45E+04 13% 52 6.71E+04 31% 82 1.23E+05 50% 112 1.87E+05 68% 142 2.91E+05 86%

23 4.47E+04 14% 53 6.87E+04 32% 83 1.26E+05 50% 113 1.88E+05 69% 143 2.91E+05 87%

24 4.55E+04 14% 54 6.93E+04 33% 84 1.27E+05 51% 114 1.98E+05 69% 144 2.92E+05 88%

25 4.56E+04 15% 55 7.15E+04 33% 85 1.30E+05 52% 115 1.99E+05 70% 145 2.96E+05 88%

26 4.58E+04 16% 56 7.44E+04 34% 86 1.31E+05 52% 116 2.01E+05 70% 146 3.06E+05 89%

27 4.76E+04 16% 57 7.52E+04 34% 87 1.33E+05 53% 117 2.04E+05 71% 147 3.12E+05 89%

28 4.77E+04 17% 58 7.66E+04 35% 88 1.33E+05 53% 118 2.05E+05 72% 148 3.14E+05 90%

29 4.77E+04 17% 59 7.92E+04 36% 89 1.34E+05 54% 119 2.06E+05 72% 149 3.44E+05 91%

30 4.82E+04 18% 60 7.99E+04 36% 90 1.34E+05 55% 120 2.14E+05 73% 150 3.51E+05 91%

[184]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 HISTOGRAM FOR Cs-137 Survey Unit: B1-01100A-F Survey Unit Name: Unit 1 Containment Above 565 ft Mean: 1.59E+05 pCi/m2 Median: 1.25E+05 pCi/m2 ST DEV: 1.41E+05 Skew: 2.20E+00 Frequency Plot For Cs-137 50%

45%

40%

35%

Frequency 30%

25%

20%

15%

10%

5%

0%

1.06E+05 2.87E+05 4.68E+05 6.50E+05 8.31E+05 Upper End Value (pCi/m2)

Observation Observation Upper Value Frequency %

1.06E+05 75 46%

1.96E+05 38 23%

2.87E+05 28 17%

3.78E+05 10 6%

4.68E+05 9 5%

5.59E+05 1 1%

6.50E+05 0 0%

7.40E+05 0 0%

8.31E+05 2 1%

9.22E+05 1 1%

TOTAL 164 100%

[185]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 QUANTILE PLOT FOR Eu-152 Survey Unit: B1-01100A-F Survey Unit Name: Unit 1 Containment Above 565 ft Mean: 1.28E+05 pCi/m2 Quantile Plot For Eu-152 6.00E+06 5.00E+06 Concentration (pCi/m2) 4.00E+06 3.00E+06 2.00E+06 1.00E+06 0.00E+00 0% 20% 40% 60% 80% 100%

Percentage

[186]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 RANK Eu-152 % RANK Eu-152 % RANK Eu-152 % RANK Eu-152 % RANK Eu-152 % RANK Eu-152 %

1 0.00E+00 0% 31 1.34E+04 19% 61 2.42E+04 37% 91 3.42E+04 55% 121 5.66E+04 73% 151 1.06E+05 92%

2 0.00E+00 1% 32 1.34E+04 19% 62 2.44E+04 38% 92 3.45E+04 56% 122 5.75E+04 74% 152 1.12E+05 92%

3 2.53E+03 2% 33 1.36E+04 20% 63 2.48E+04 38% 93 3.48E+04 56% 123 5.77E+04 75% 153 1.12E+05 93%

4 2.61E+03 2% 34 1.41E+04 20% 64 2.49E+04 39% 94 3.70E+04 57% 124 5.82E+04 75% 154 1.13E+05 94%

5 3.01E+03 3% 35 1.42E+04 21% 65 2.51E+04 39% 95 3.72E+04 58% 125 5.93E+04 76% 155 1.27E+05 94%

6 3.23E+03 3% 36 1.42E+04 22% 66 2.53E+04 40% 96 3.72E+04 58% 126 5.93E+04 77% 156 1.33E+05 95%

7 3.39E+03 4% 37 1.43E+04 22% 67 2.53E+04 41% 97 3.76E+04 59% 127 6.06E+04 77% 157 1.60E+05 95%

8 3.77E+03 5% 38 1.43E+04 23% 68 2.54E+04 41% 98 3.86E+04 59% 128 6.14E+04 78% 158 6.30E+05 96%

9 4.98E+03 5% 39 1.51E+04 23% 69 2.56E+04 42% 99 3.87E+04 60% 129 6.33E+04 78% 159 6.71E+05 97%

10 5.54E+03 6% 40 1.54E+04 24% 70 2.65E+04 42% 100 3.89E+04 61% 130 6.38E+04 79% 160 7.67E+05 97%

11 6.32E+03 6% 41 1.56E+04 25% 71 2.69E+04 43% 101 3.89E+04 61% 131 6.74E+04 80% 161 9.12E+05 98%

12 6.94E+03 7% 42 1.57E+04 25% 72 2.83E+04 44% 102 3.96E+04 62% 132 6.79E+04 80% 162 2.94E+06 98%

13 7.23E+03 8% 43 1.68E+04 26% 73 2.85E+04 44% 103 3.96E+04 63% 133 6.99E+04 81% 163 3.21E+06 99%

14 7.43E+03 8% 44 1.68E+04 27% 74 2.88E+04 45% 104 4.17E+04 63% 134 7.20E+04 81% 164 5.71E+06 100%

15 8.04E+03 9% 45 1.95E+04 27% 75 2.89E+04 45% 105 4.34E+04 64% 135 7.33E+04 82%

16 8.34E+03 9% 46 2.07E+04 28% 76 2.92E+04 46% 106 4.59E+04 64% 136 7.48E+04 83%

17 8.49E+03 10% 47 2.07E+04 28% 77 2.95E+04 47% 107 4.66E+04 65% 137 7.90E+04 83%

18 8.56E+03 11% 48 2.08E+04 29% 78 2.97E+04 47% 108 4.68E+04 66% 138 7.92E+04 84%

19 9.18E+03 11% 49 2.08E+04 30% 79 3.00E+04 48% 109 4.68E+04 66% 139 7.93E+04 84%

20 9.32E+03 12% 50 2.12E+04 30% 80 3.07E+04 48% 110 4.68E+04 67% 140 7.95E+04 85%

21 9.38E+03 13% 51 2.13E+04 31% 81 3.11E+04 49% 111 4.86E+04 67% 141 7.97E+04 86%

22 1.08E+04 13% 52 2.19E+04 31% 82 3.15E+04 50% 112 4.90E+04 68% 142 8.31E+04 86%

23 1.09E+04 14% 53 2.19E+04 32% 83 3.19E+04 50% 113 5.32E+04 69% 143 8.36E+04 87%

24 1.09E+04 14% 54 2.20E+04 33% 84 3.27E+04 51% 114 5.38E+04 69% 144 8.47E+04 88%

25 1.10E+04 15% 55 2.21E+04 33% 85 3.32E+04 52% 115 5.41E+04 70% 145 8.87E+04 88%

26 1.13E+04 16% 56 2.28E+04 34% 86 3.35E+04 52% 116 5.43E+04 70% 146 9.21E+04 89%

27 1.19E+04 16% 57 2.33E+04 34% 87 3.36E+04 53% 117 5.44E+04 71% 147 9.58E+04 89%

28 1.20E+04 17% 58 2.37E+04 35% 88 3.36E+04 53% 118 5.48E+04 72% 148 1.04E+05 90%

29 1.22E+04 17% 59 2.39E+04 36% 89 3.37E+04 54% 119 5.50E+04 72% 149 1.05E+05 91%

30 1.24E+04 18% 60 2.41E+04 36% 90 3.37E+04 55% 120 5.52E+04 73% 150 1.05E+05 91%

[187]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 HISTOGRAM FOR Eu-152 Survey Unit: B1-01100A-F Survey Unit Name: Unit 1 Containment Above 565 ft Mean: 1.28E+05 pCi/m2 Median: 3.17E+04 pCi/m2 ST DEV: 5.62E+05 Skew: 7.91E+00 Frequency Plot For Eu-152 120%

100%

80%

Frequency 60%

40%

20%

0%

5.71E+05 1.71E+06 2.85E+06 4.00E+06 5.14E+06 Upper End Value (pCi/m2)

Observation Observation Upper Value Frequency %

5.71E+05 157 96%

1.14E+06 4 2%

1.71E+06 0 0%

2.28E+06 0 0%

2.85E+06 0 0%

3.43E+06 2 1%

4.00E+06 0 0%

4.57E+06 0 0%

5.14E+06 0 0%

5.71E+06 1 1%

TOTAL 164 100%

[188]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 QUANTILE PLOT FOR Eu-154 Survey Unit: B1-01100A-F Survey Unit Name: Unit 1 Containment Above 565 ft Mean: 3.40E+04 pCi/m2

[189]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 RANK Eu-154 % RANK Eu-154 % RANK Eu-154 % RANK Eu-154 % RANK Eu-154 % RANK Eu-154 %

1 0.00E+00 0% 31 5.69E+03 19% 61 1.23E+04 37% 91 2.18E+04 55% 121 3.41E+04 73% 151 7.22E+04 92%

2 0.00E+00 1% 32 6.16E+03 19% 62 1.23E+04 38% 92 2.23E+04 56% 122 3.47E+04 74% 152 7.53E+04 92%

3 0.00E+00 2% 33 6.23E+03 20% 63 1.24E+04 38% 93 2.26E+04 56% 123 3.57E+04 75% 153 7.58E+04 93%

4 0.00E+00 2% 34 6.24E+03 20% 64 1.27E+04 39% 94 2.29E+04 57% 124 3.57E+04 75% 154 7.67E+04 94%

5 0.00E+00 3% 35 6.31E+03 21% 65 1.31E+04 39% 95 2.30E+04 58% 125 3.59E+04 76% 155 8.19E+04 94%

6 0.00E+00 3% 36 6.79E+03 22% 66 1.34E+04 40% 96 2.38E+04 58% 126 3.62E+04 77% 156 8.37E+04 95%

7 0.00E+00 4% 37 7.08E+03 22% 67 1.39E+04 41% 97 2.42E+04 59% 127 3.63E+04 77% 157 8.43E+04 95%

8 0.00E+00 5% 38 7.30E+03 23% 68 1.40E+04 41% 98 2.43E+04 59% 128 3.65E+04 78% 158 1.22E+05 96%

9 0.00E+00 5% 39 7.44E+03 23% 69 1.46E+04 42% 99 2.43E+04 60% 129 3.71E+04 78% 159 1.28E+05 97%

10 0.00E+00 6% 40 7.49E+03 24% 70 1.49E+04 42% 100 2.48E+04 61% 130 3.76E+04 79% 160 1.38E+05 97%

11 0.00E+00 6% 41 7.53E+03 25% 71 1.49E+04 43% 101 2.50E+04 61% 131 3.82E+04 80% 161 2.74E+05 98%

12 3.55E+02 7% 42 8.02E+03 25% 72 1.49E+04 44% 102 2.53E+04 62% 132 3.82E+04 80% 162 3.63E+05 98%

13 7.04E+02 8% 43 8.63E+03 26% 73 1.59E+04 44% 103 2.53E+04 63% 133 3.82E+04 81% 163 4.53E+05 99%

14 1.37E+03 8% 44 8.92E+03 27% 74 1.60E+04 45% 104 2.60E+04 63% 134 4.00E+04 81% 164 5.65E+05 100%

15 1.43E+03 9% 45 8.95E+03 27% 75 1.67E+04 45% 105 2.65E+04 64% 135 4.05E+04 82%

16 1.92E+03 9% 46 9.21E+03 28% 76 1.69E+04 46% 106 2.70E+04 64% 136 4.37E+04 83%

17 2.04E+03 10% 47 9.57E+03 28% 77 1.70E+04 47% 107 2.92E+04 65% 137 4.40E+04 83%

18 2.33E+03 11% 48 9.71E+03 29% 78 1.70E+04 47% 108 2.93E+04 66% 138 4.46E+04 84%

19 2.50E+03 11% 49 9.87E+03 30% 79 1.77E+04 48% 109 2.93E+04 66% 139 4.54E+04 84%

20 2.71E+03 12% 50 9.99E+03 30% 80 1.82E+04 48% 110 2.98E+04 67% 140 4.58E+04 85%

21 3.17E+03 13% 51 1.00E+04 31% 81 1.85E+04 49% 111 3.00E+04 67% 141 5.01E+04 86%

22 3.19E+03 13% 52 1.02E+04 31% 82 1.92E+04 50% 112 3.03E+04 68% 142 5.08E+04 86%

23 3.37E+03 14% 53 1.04E+04 32% 83 1.95E+04 50% 113 3.11E+04 69% 143 5.15E+04 87%

24 4.26E+03 14% 54 1.04E+04 33% 84 1.95E+04 51% 114 3.11E+04 69% 144 5.22E+04 88%

25 4.30E+03 15% 55 1.05E+04 33% 85 1.99E+04 52% 115 3.13E+04 70% 145 5.52E+04 88%

26 4.43E+03 16% 56 1.07E+04 34% 86 1.99E+04 52% 116 3.15E+04 70% 146 5.69E+04 89%

27 4.66E+03 16% 57 1.10E+04 34% 87 2.04E+04 53% 117 3.18E+04 71% 147 6.19E+04 89%

28 4.97E+03 17% 58 1.11E+04 35% 88 2.06E+04 53% 118 3.20E+04 72% 148 6.34E+04 90%

29 5.28E+03 17% 59 1.22E+04 36% 89 2.10E+04 54% 119 3.22E+04 72% 149 6.36E+04 91%

30 5.48E+03 18% 60 1.22E+04 36% 90 2.13E+04 55% 120 3.30E+04 73% 150 6.43E+04 91%

[190]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 HISTOGRAM FOR Eu-154 Survey Unit: B1-01100A-F Survey Unit Name: Unit 1 Containment Above 565 ft Mean: 3.40E+04 pCi/m2 Median: 1.93E+04 pCi/m2 ST DEV: 6.70E+04 Skew: 5.66E+00 Frequency Plot For Eu-154 100%

90%

80%

70%

Frequency 60%

50%

40%

30%

20%

10%

0%

5.65E+04 1.69E+05 2.82E+05 3.95E+05 5.08E+05 Upper End Value (pCi/m2)

Observation Observation Upper Value Frequency %

5.65E+04 145 88%

1.13E+05 12 7%

1.69E+05 3 2%

2.26E+05 0 0%

2.82E+05 1 1%

3.39E+05 0 0%

3.95E+05 1 1%

4.52E+05 0 0%

5.08E+05 1 1%

5.65E+05 1 1%

TOTAL 164 100%

[191]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 QUANTILE PLOT FOR Co-60 Survey Unit: B1-01110A-F Survey Unit Name: Unit 1 Undervessel Mean: 7.74E+05 pCi/m2 RANK Co-60 % RANK Co-60 % RANK Co-60 %

1 3.10E+04 1% 21 1.82E+05 34% 41 3.98E+05 68%

2 5.89E+04 3% 22 1.91E+05 36% 42 3.99E+05 69%

3 6.19E+04 4% 23 1.98E+05 38% 43 4.11E+05 71%

4 8.28E+04 6% 24 2.04E+05 39% 44 4.11E+05 73%

5 8.48E+04 8% 25 2.13E+05 41% 45 6.00E+05 74%

6 9.88E+04 9% 26 2.13E+05 43% 46 6.36E+05 76%

7 1.10E+05 11% 27 2.14E+05 44% 47 6.54E+05 78%

8 1.20E+05 13% 28 2.43E+05 46% 48 6.83E+05 79%

9 1.30E+05 14% 29 2.44E+05 48% 49 1.30E+06 81%

10 1.39E+05 16% 30 2.45E+05 49% 50 2.16E+06 83%

11 1.39E+05 18% 31 2.58E+05 51% 51 2.17E+06 84%

12 1.43E+05 19% 32 2.60E+05 53% 52 2.35E+06 86%

13 1.47E+05 21% 33 2.65E+05 54% 53 2.45E+06 88%

14 1.48E+05 23% 34 2.92E+05 56% 54 2.64E+06 89%

15 1.55E+05 24% 35 2.95E+05 58% 55 2.95E+06 91%

16 1.61E+05 26% 36 2.97E+05 59% 56 3.10E+06 93%

17 1.65E+05 28% 37 3.08E+05 61% 57 3.30E+06 94%

18 1.66E+05 29% 38 3.11E+05 63% 58 3.84E+06 96%

19 1.67E+05 31% 39 3.27E+05 64% 59 3.85E+06 98%

20 1.79E+05 33% 40 3.63E+05 66% 60 3.90E+06 99%

[192]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 HISTOGRAM FOR Co-60 Survey Unit: B1-01110A-F Survey Unit Name: Unit 1 Undervessel Mean: 7.63E+05 pCi/m2 Median: 2.52E+05 pCi/m2 ST DEV: 1.11E+06 Skew: 1.82E+00 Frequency Plot For Co-60 90%

80%

70%

60%

Frequency 50%

40%

30%

20%

10%

0%

4.21E+05 1.20E+06 1.98E+06 2.76E+06 3.54E+06 Upper End Value (pCi/m2)

Observation Observation Upper Value Frequency %

4.21E+05 1 2%

8.11E+05 47 78%

1.20E+06 0 0%

1.59E+06 1 2%

1.98E+06 0 0%

2.37E+06 3 5%

2.76E+06 2 3%

3.15E+06 2 3%

3.54E+06 1 2%

3.93E+06 3 5%

TOTAL 60 100%

[193]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 QUANTILE PLOT FOR Cs-137

[194]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 RANK Cs-137 % RANK Cs-137 % RANK Cs-137 %

1 3.98E+05 1% 21 2.44E+06 34% 41 4.64E+06 68%

2 5.21E+05 3% 22 2.48E+06 36% 42 4.66E+06 69%

3 5.79E+05 4% 23 2.51E+06 38% 43 5.30E+06 71%

4 5.90E+05 6% 24 2.52E+06 39% 44 5.37E+06 73%

5 8.23E+05 8% 25 2.81E+06 41% 45 5.97E+06 74%

6 8.61E+05 9% 26 2.90E+06 43% 46 6.36E+06 76%

7 8.93E+05 11% 27 2.93E+06 44% 47 6.93E+06 78%

8 9.52E+05 13% 28 3.22E+06 46% 48 7.78E+06 79%

9 1.29E+06 14% 29 3.28E+06 48% 49 7.88E+06 81%

10 1.41E+06 16% 30 3.49E+06 49% 50 8.22E+06 83%

11 1.45E+06 18% 31 3.64E+06 51% 51 8.28E+06 84%

12 1.51E+06 19% 32 3.64E+06 53% 52 8.44E+06 86%

13 1.68E+06 21% 33 3.74E+06 54% 53 8.93E+06 88%

14 1.72E+06 23% 34 3.88E+06 56% 54 8.97E+06 89%

15 1.75E+06 24% 35 3.95E+06 58% 55 9.24E+06 91%

16 1.76E+06 26% 36 4.14E+06 59% 56 9.35E+06 93%

17 1.78E+06 28% 37 4.21E+06 61% 57 1.14E+07 94%

18 1.85E+06 29% 38 4.24E+06 63% 58 1.23E+07 96%

19 2.01E+06 31% 39 4.48E+06 64% 59 1.29E+07 98%

20 2.06E+06 33% 40 4.50E+06 66% 60 1.32E+07 99%

[195]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 HISTOGRAM FOR Cs-137 Survey Unit: B1-01110A-F Survey Unit Name: Unit 1 Undervessel Mean: 4.35E+06 pCi/m2 Median: 3.56E+06 pCi/m2 ST DEV: 3.35E+06 Skew: 1.05E+00 Frequency Plot For Cs-137 25%

20%

Frequency 15%

10%

5%

0%

1.72E+06 4.36E+06 7.00E+06 9.64E+06 1.23E+07 Upper End Value (pCi/m2)

Observation Observation Upper Value Frequency %

1.72E+06 14 23%

3.04E+06 13 22%

4.36E+06 11 18%

5.68E+06 6 10%

7.00E+06 3 5%

8.32E+06 3 5%

9.64E+06 6 10%

1.10E+07 0 0%

1.23E+07 2 3%

1.36E+07 2 3%

TOTAL 60 100%

[196]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 QUANTILE PLOT FOR Eu-152

[197]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 RANK Eu-152 % RANK Eu-152 % RANK Eu-152 %

1 0.00E+00 1% 21 5.49E+05 34% 41 1.72E+06 68%

2 2.42E+04 3% 22 5.57E+05 36% 42 1.83E+06 69%

3 7.55E+04 4% 23 5.89E+05 38% 43 2.12E+06 71%

4 7.96E+04 6% 24 6.14E+05 39% 44 2.34E+06 73%

5 1.11E+05 8% 25 6.74E+05 41% 45 2.51E+06 74%

6 1.15E+05 9% 26 7.29E+05 43% 46 3.17E+06 76%

7 1.33E+05 11% 27 7.33E+05 44% 47 3.62E+06 78%

8 1.40E+05 13% 28 7.61E+05 46% 48 3.64E+06 79%

9 1.44E+05 14% 29 8.63E+05 48% 49 6.92E+06 81%

10 1.73E+05 16% 30 9.38E+05 49% 50 8.49E+06 83%

11 1.92E+05 18% 31 9.55E+05 51% 51 8.84E+06 84%

12 2.41E+05 19% 32 1.09E+06 53% 52 1.10E+07 86%

13 3.52E+05 21% 33 1.12E+06 54% 53 1.21E+07 88%

14 3.71E+05 23% 34 1.17E+06 56% 54 1.22E+07 89%

15 3.94E+05 24% 35 1.22E+06 58% 55 1.36E+07 91%

16 4.19E+05 26% 36 1.24E+06 59% 56 1.61E+07 93%

17 4.69E+05 28% 37 1.44E+06 61% 57 2.35E+07 94%

18 5.16E+05 29% 38 1.51E+06 63% 58 3.11E+07 96%

19 5.21E+05 31% 39 1.66E+06 64% 59 3.17E+07 98%

20 5.47E+05 33% 40 1.70E+06 66% 60 3.60E+07 99%

[198]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 HISTOGRAM FOR Eu-152 Survey Unit: B1-01110A-F Survey Unit Name: Unit 1 Undervessel Mean: 4.35E+06 pCi/m2 Median: 3.56E+06 pCi/m2 ST DEV: 3.35E+06 Skew: 1.05E+00 Frequency Plot For Eu-152 25%

20%

Frequency 15%

10%

5%

0%

1.72E+06 4.36E+06 7.00E+06 9.64E+06 1.23E+07 Upper End Value (pCi/m2)

Observation Observation Upper Value Frequency %

1.72E+06 14 23%

3.04E+06 13 22%

4.36E+06 11 18%

5.68E+06 6 10%

7.00E+06 3 5%

8.32E+06 4 7%

9.64E+06 5 8%

1.10E+07 0 0%

1.23E+07 1 2%

1.36E+07 3 5%

TOTAL 60 100%

[199]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 QUANTILE PLOT FOR Eu-154

[200]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 RANK Eu-154 % RANK Eu-154 % RANK Eu-154 %

1 0.00E+00 1% 21 5.49E+05 34% 41 1.72E+06 68%

2 2.42E+04 3% 22 5.57E+05 36% 42 1.83E+06 69%

3 7.55E+04 4% 23 5.89E+05 38% 43 2.12E+06 71%

4 7.96E+04 6% 24 6.14E+05 39% 44 2.34E+06 73%

5 1.11E+05 8% 25 6.74E+05 41% 45 2.51E+06 74%

6 1.15E+05 9% 26 7.29E+05 43% 46 3.17E+06 76%

7 1.33E+05 11% 27 7.33E+05 44% 47 3.62E+06 78%

8 1.40E+05 13% 28 7.61E+05 46% 48 3.64E+06 79%

9 1.44E+05 14% 29 8.63E+05 48% 49 6.92E+06 81%

10 1.73E+05 16% 30 9.38E+05 49% 50 8.49E+06 83%

11 1.92E+05 18% 31 9.55E+05 51% 51 8.84E+06 84%

12 2.41E+05 19% 32 1.09E+06 53% 52 1.10E+07 86%

13 3.52E+05 21% 33 1.12E+06 54% 53 1.21E+07 88%

14 3.71E+05 23% 34 1.17E+06 56% 54 1.22E+07 89%

15 3.94E+05 24% 35 1.22E+06 58% 55 1.36E+07 91%

16 4.19E+05 26% 36 1.24E+06 59% 56 1.61E+07 93%

17 4.69E+05 28% 37 1.44E+06 61% 57 2.35E+07 94%

18 5.16E+05 29% 38 1.51E+06 63% 58 3.11E+07 96%

19 5.21E+05 31% 39 1.66E+06 64% 59 3.17E+07 98%

20 5.47E+05 33% 40 1.70E+06 66% 60 3.60E+07 99%

[201]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 HISTOGRAM FOR Eu-154 Survey Unit: B1-01110A-F Survey Unit Name: Unit 1 Undervessel Mean: 4.73E+05 pCi/m2 Median: 3.51E+05 pCi/m2 ST DEV: 4.36E+05 Skew: 1.11E+00 Frequency Plot For Eu-154 25%

20%

Frequency 15%

10%

5%

0%

1.72E+06 4.36E+06 7.00E+06 9.64E+06 1.23E+07 Upper End Value (pCi/m2)

Observation Observation Upper Value Frequency %

1.67E+05 20 33%

3.34E+05 8 13%

5.01E+05 7 12%

6.68E+05 10 17%

8.35E+05 4 7%

1.00E+06 4 7%

1.17E+06 1 2%

1.34E+06 1 2%

1.50E+06 3 5%

1.67E+06 2 3%

TOTAL 60 100%

[202]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 ATTACHMENT 6 EBERLINE REPORTS

[203]

[204]

[205]

[206]

[207]

[208]

[209]

[210]

[211]

[212]

[213]

[214]

[215]

[216]

[217]

[218]

[219]

[220]

[221]

[222]

[223]

[224]

[225]

[226]

[227]

[228]

[229]

[230]

[231]

[232]

[233]

[234]

[235]

[236]

[237]

[238]

[239]

[240]

FSS RELEASE RECORD UNIT 1 CONTAINMENT BASEMENT SURVEY UNITS 01100 AND 01110 ATTACHMENT 7 ISOCS ANALYTICAL REPORTS (See Separate Attachment 7 File)

[241]

ML19077A041

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