ML20352A254

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Response to Request for Additional Information Re Revised Final Status Survey Final Reports, B3-012-109 Release Record, Revision 1, Security Station
ML20352A254
Person / Time
Site: La Crosse  File:Dairyland Power Cooperative icon.png
Issue date: 11/02/2020
From:
La CrosseSolutions
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML20356A041 List:
References
LC-2020-0023
Download: ML20352A254 (36)
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Text

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LACROSSESOLUTIONS LA CROSSE BOILING WATER REACTOR FINAL STATUS SURVEY RELEASE RECORD SECURITY STATION SURVEY UNIT B3-012-109 REVISION 1

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Robert F. Yetter III Oct 25 2020 1:51 PM PREPARED BY / DATE: cosign R. F. Yetter III, FSS Specialist Mitchell Uz Oct 27 2020 7:56 AM REVIEWED BY / DATE: cosign M. D. Uz, FSS Specialist Robert F. Yetter 9wl,.e,tt9-.'lj.etwt, Oct 27 2020 11 :00 AM REVIEWED BY / DATE: cosign R. Yetter, Director, Radiological Site Closure Sarah Roberts Oct 27 2020 12:49 PM REVIEWED BY / DATE: cosign S. Roberts, VP Radiological Programs Scott G. Zoller Oct 29 2020 9:31 AM APPROVED BY / DATE:

S. Zoller, FSS Manager 1

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS TABLE OF CONTENTS

1. EXECUTIVE

SUMMARY

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

2. SURVEY UNIT DESCRIPTION ....................................................................................................................... 5
3. CLASSIFICATION BASIS ................................................................................................................................. 6
4. DATA QUALITY OBJECTIVES (DQO) .......................................................................................................... 7
5. SURVEY DESIGN ............................................................................................................................................... 9
6. SURVEY IMPLEMENTATION ...................................................................................................................... 14
7. SURVEY RESULTS .......................................................................................................................................... 15
8. QUALITY CONTROL ...................................................................................................................................... 17
9. INVESTIGATIONS AND RESULTS .............................................................................................................. 17
10. REMEDIATION AND RESULTS ................................................................................................................... 17
11. CHANGES FROM THE FINAL STATUS SURVEY PLAN ........................................................................ 17
12. DATA QUALITY ASSESSMENT (DQA) ....................................................................................................... 17
13. ANOMALIES ..................................................................................................................................................... 18
14. CONCLUSION .................................................................................................................................................. 18
15. REFERENCES................................................................................................................................................... 18
16. ATTACHMENTS .............................................................................................................................................. 19 ATTACHMENT 1 FIGURES AND MAPS ............................................................................................................. 20 ATTACHMENT 2 SCAN DATA ............................................................................................................................. 22 ATTACHMENT 3 SIGN TEST ............................................................................................................................... 24 ATTACHMENT 4 QUALITY CONTROL ASSESSMENT ...................................................................................... 26 ATTACHMENT 5 GRAPHICAL PRESENTATIONS ............................................................................................. 28 ATTACHMENT 6 LUDLUM 2350-1 DOWNLOAD REPORTS ............................................................................ 32 2

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS LIST OF TABLES Table 3-1 Static Measurements for Characterization of Above Grade Buildings ................................................ 6 Table 3-2 Summary Statistics for Characterization of Above Grade Buildings .................................................. 6 Table 4 Dose Significant Radionuclides and Mixture for Above Grade Buildings ........................................... 8 Table 4 Base Case DCGLs for Above Grade Buildings (DCGL AGB) .................................................................. 9 Table 4 Operational DCGLs for Above Grade Buildings (OpDCGL AGB) ......................................................... 9 Table 5-1 Survey Unit B3-012-109 Measurement Designations........................................................................... 12 Table 5-2 Investigation Levels ................................................................................................................................ 13 Table 5-3 Synopsis of Survey Design...................................................................................................................... 13 Table 7-1 Synopsis of Scan Results ........................................................................................................................ 15 Table 7-2 Detector Efficiencies .................................................................................... Error! Bookmark not defined.

Table 7-3 Summary of Random, Judgmental, and QC Static Measurements ................................................... 16 Table 7-4 Basic Statistical Properties of Random Measurement Population ..................................................... 16 Table 16-1 Survey Unit B3-012-109 Complete Scan Data .................................................................................... 23 Table 16-2 Survey Unit B3-012-109 Sign Test ....................................................................................................... 25 Table 16-3 Survey Unit B3-012-109 QC Assessment ............................................................................................ 27 LIST OF FIGURES Figure 16-1 Survey Unit B3-012-109 Random and Judgmental Measurement Locations Map ....................... 21 Figure 16 Quantile Plot for Gross Activity ......................................................................................................... 29 Figure 16 Histogram for Gross Activity .............................................................................................................. 30 Figure 16 Retrospective Power Curve for Survey Unit B3-012-109 ................................................................. 31 3

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS LIST OF ACRONYMS AND ABBREVIATIONS ALARA As Low As Reasonably Achievable ASP Alarm Set Point DQA Data Quality Assessment DQO Data Quality Objective DCGL Derived Concentration Guideline Level DCGLAGB Above Grade Building Derived Concentration Guideline Level FSS Final Status Survey GPS Global Positioning System G-1 Genoa 1 HSA Historical Site Assessment IC Insignificant Contributors LACBWR La Crosse Boiling Water Reactor LBGR Lower Bound of the Gray Region LTP License Termination Plan MARSSIM Multi-Agency Radiation Survey and Site Investigation Manual MDC Minimum Detectable Concentration MDCR Minimal Detectable Count Rate OpDCGLAGB Above Grade Building Operational Derived Concentration Guideline Level QAPP Quality Assurance Project Plan QC Quality Control ROC Radionuclides of Concern SOF Sum of Fractions TEDE Total Effective Dose Equivalent UBGR Upper Bound of the Gray Region UCL Upper Confidence Limit URS Unconditional Release Survey USNRC United States Nuclear Regulatory Commission 4

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS

1. EXECUTIVE

SUMMARY

This Final Status Survey (FSS) Release Record for survey unit B3-012-109, Security Station, has been generated in accordance with LaCrosseSolutions procedure LC-FS-PR-009, Final Status Survey Data Reporting (Reference 1) and satisfies the requirements of Section 5.11 of the La Crosse Boiling Water Reactor License Termination Plan (LACBWR LTP) (Reference 2).

An FSS sample plan for this survey unit was developed in accordance with LaCrosseSolutions procedures LC-FS-PR-015, Final Status Surveys for Structures (Reference 3) and LC-FS-PR-002, Final Status Survey Package Development (Reference 4), the LACBWR LTP, and with guidance from NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) (Reference 5).

Survey unit B3-012-109, an above grade building survey unit, has a MARSSIM classification of 3. A survey plan was designed based upon use of the Sign Test as the nonparametric statistical test for compliance. Both the Type I ( a) and Type II ( ) decision error rates were set at 0.05. As a random measurement population, fourteen (14) static beta measurements were acquired from the survey unit. In addition, surface scanning was performed on approximately 12% of the total surface area in the survey unit. The data assessment results for survey unit B3-012-109 indicate that the maximum gross activity among random measurements is equal to 215 dpm/100 cm 2, which is 6.80% of the Adjusted Gross Operational Derived Concentration Guideline Level (DCGL) for above grade buildings (see Section 5 of this release record for the calculations of adjusted gross DCGLs).

Therefore, the null hypothesis of the Sign test is rejected and survey unit B3-012-109 is acceptable for unrestricted release. The mean gross activity among random measurements is equal to 43 dpm/100 cm2, which is 0.22% of the Adjusted Gross Base Case DCGL. The mean gross activity in the survey unit divided by the Adjusted Gross Base Case DCGL and then multiplied by 25 mrem/yr results in a calculated dose for the survey unit of 0.0541 mrem/yr.

2. SURVEY UNIT DESCRIPTION B3-012-109 is an impacted Class 3 above grade building survey unit. The survey unit consists of the interior and exterior surfaces of the Security Station. The Security Station served as the security force housing and access point for the Dairyland Power property. The Security Station is a small one-story building measuring 4.3 m long by 3.1 m wide by 2.7 m high, which equates to a total surface area of 122 m 2. Refer to Attachment 1 of this report for figures and maps depicting survey unit B3-012-109.

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS

3. CLASSIFICATION BASIS Based on the La Crosse Boiling Water Reactor Historical Site Assessment (HSA)

(Reference 6), survey unit B3-012-109 was identified as a Class 3 structure survey unit. The following summarizes the results of the characterization surveys for seven (7) of the above grade buildings to be left on-site upon termination of the license.

The characterization surveys for the above grade buildings were conducted between November 8, 2016, and November 18, 2016. In total, fifty-six (56) static beta measurements were collected in the buildings (eight [8] in each of seven [7] buildings). No measurements exceeded their respective action levels. A summary of the static measurements is presented in Table 3-1. The summary statistics for the characterization data are provided in Table 3-2.

Table 3-1 Static Measurements for Characterization of Above Grade Buildings Static Beta Measurements (dpm/100 cm 2)

Barge Back-Up Transmission LACBWR G-3 Crib Wash G-1 Crib Security Control Sub-Station Crib House House Break House Station Center Switch House Room 313 1,264 588 213 0 751 0 13 13 363 226 38 0 150 0 38 0 0 0 0 0 1,702 26 88 889 0 1,514 0 138 0 0 376 0 0 38 0 450 0 238 0 551 100 0 100 0 0 163 438 225 0 2,203 651 0 0 1,089 13 Table 3-2 Summary Statistics for Characterization of Above Grade Buildings Standard Mean Median Minimum Maximum Deviation (dpm/100 cm2) (dpm/100 cm2) (dpm/100 cm2) (dpm/100 cm2) (dpm/100 cm2) 267 I 32 I 0 I 2,203 I 473 Based upon 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 unit B3-012-109 was determined to be Class 3.

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS

4. DATA QUALITY OBJECTIVES (DQO)

FSS planning and design relies on a properly executed Data Quality Objective (DQO) process to ensure, through compliance with explicitly defined inputs and boundaries, that the primary objective of the survey is satisfied. The DQO process, utilized in accordance with MARSSIM, is described in the LACBWR LTP. The appropriate design for a given survey was 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 unit B3-012-109 did not exceed the release criteria specified in the LTP and that the potential dose from residual radioactivity is As Low As Reasonably Achievable (ALARA).

EnergySolutions TSD RS-TD-313196-001, Radionuclides of Concern during LACBWR Decommissioning (Reference 7) established the basis for an initial suite of potential ROC for decommissioning. Insignificant contributors (IC) were determined consistent with the guidance contained in Section 3.3 of NUREG-1757, Volume 2, Revision 1, Consolidated Decommissioning Guidance Characterization, Survey, and Determination of Radiological Criteria, Final Report (Reference 8). In all soil and concrete scenarios, Cs-137, Co-60, Sr-90, Eu-152 and Eu-154 contribute nearly 100% of the total dose. The remaining radionuclides were designated as IC and were eliminated from further detailed evaluation. Therefore, the final ROCs for LACBWR above grade buildings, soil, basement concrete, and buried piping are Cs-137, Co-60, Sr-90, Eu-152 and Eu-154.

The LTP, Section 6.14.1 discusses the process used to derive the ROC for the decommissioning of LACBWR, including the elimination of IC from the initial suite.

Table 4-1 presents the ROC for the decommissioning of above grade buildings at LACBWR and the normalized mixture fractions based on the radionuclide mixture.

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Table 4 Dose Significant Radionuclides and Mixture for Above Grade Buildings Fraction of Total Activity Radionuclide (normalized)(1)

Co-60 0.0644 Sr-90 0.0981 Cs-137 0.829 Eu-152 0.00549 Eu-154 0.00281 (1) Based on maximum percent of total activity from Table 22 of RS-TD-313196-001, normalized to one for the dose significant radionuclides.

LTP, Section 5.2 states that 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/yr to an Average Member of the Critical Group. 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/yr 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 LC-FS-TSD-002, Operational Derived Concentration Guideline Levels for Final Status Survey (Reference 9).

At LACBWR, compliance is demonstrated through the summation of dose from five (5) distinct source terms (i.e., basements, soils, buried pipe, above grade buildings, and groundwater) for the end-state. When applied to above grade buildings, the DCGLs are expressed in units of activity per surface area (dpm/100 cm 2).

The Screening Values in NUREG-1757, Volume 2, Revision 1, Consolidated Decommissioning Guidance Characterization, Survey, and Determination of Radiological Criteria, Final Report, Table H-1, are applied to the FSS of above grade buildings. The Table H-1 Screening Values are presented as Base Case DCGLs (equivalent to 25 mrem/yr) and are reproduced in Table 4-2 below.

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Table 4 Base Case DCGLs for Above Grade Buildings (DCGL AGB)

DCGLAGB Radionuclide (dpm/100cm2)

Co-60 7,100 Sr-90 8,700 Cs-137 28,000 Eu-152 12,700 Eu-154 11,500 The Operational DCGLs are then used as the DCGL for the FSS design of the survey unit (calculation of surrogate DCGLs, investigation levels, etc.). The Operational DCGLs for the unrestricted release of above grade buildings are provided in Table 4-3.

Table 4 Operational DCGLs for Above Grade Buildings (OpDCGL AGB)

OpDCGLAGB Radionuclide (dpm/100cm2)

Co-60 1,136 Sr-90 1,392 Cs-137 4,480 Eu-152 2,032 Eu-154 1,840 Instrument DQOs included a verification of the ability of the survey instrument to detect the radiation(s) of interest relative to the Operational DCGL. Survey instrument response checks were required prior to issuance and after the instrument had been used. Control and accountability of survey instruments was required to assure the quality and prevent the loss of data. The minimum acceptable MDC for measurements obtained using field instruments was 50% of the applicable Operational DCGL.

5. SURVEY DESIGN The level of effort associated with planning a survey is based on the complexity of the survey and nature of the hazards. Guidance for preparing FSS plans is provided in procedures LC-FS-PR-015, Final Status Surveys for Structures and LC-FS-PR-002, Final Status Survey Package Development.

For the FSS of above grade buildings, Adjusted Gross DCGLs are calculated. This is done 9

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS because radionuclide-specific data is not acquired with static measurements. The equation for calculating the Adjusted Gross DCGL is as follows:

Equation 1 1

DCGLAc = [( fi ) ( fz ) ( h )]

DCGL 1 + DCGL 2 + ... DCGLi Where: DCGLAG = Adjusted Gross DCGL in units of dpm/100 cm 2 DCGLi = Gross DCGL for detectable radionuclide in units of dpm/100 cm2 fi = Mixture fraction of detectable radionuclides Using Equation 1, and values within Tables 4-1 and 4-3, the Adjusted Gross Operational DCGL was calculated as follows:

Equation 2 OpDCGLAG 1

= -----------,--,-------------,.---,-------------,--,------=--..,...----,-----------~

[( 0.0644 ) + ( 0.0981 ) +( 0.829 ) +( 0.00549 ) +( 0.00281 )]

1136(co-60) 1392(sr-90) 4480(cs-137) 2032(Eu-152) 1840(Eu-154)

= 3160 dpm/100 cm 2 The Adjusted Gross Operational DCGL was calculated as 3,160 dpm/100 cm 2. The action level for survey unit B3-012-109 was equivalent to 50% of the Adjusted Gross Operational DCGL, or 1,580 dpm/100 cm2.

Using Equation 1, and values within Tables 4-1 and 4-2, the Adjusted Gross Base Case DCGL was calculated as follows:

Equation 3 BcDCGLAc 1

=-------------------------------~

0.0644 ) + ( 0.0981 ) + ( 0.829 ) + ( 0.00549 ) + ( 0.00281 )]

[(

7100(co-60) 8700(sr-90) 28000(cs-137) 12700(Eu-152) 11500(Eu-is 4)

= 19751 dpm/100 cm 2 10

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS The Adjusted Gross Base Case DCGL was calculated as 19,751 dpm/100 cm 2. The mean activity from the FSS random measurements is compared to the Adjusted Gross Base Case DCGL, and the dose contribution from the survey unit is calculated.

The Sign test was selected as the non-parametric statistical test for compliance with the release criteria. The number of measurements for use with the Sign test was determined in accordance with procedures LC-FS-PR-002 and LC-FS-PR-015. The relative shift (Mcr) for the survey unit data set is defined as shift(~), which is the Upper Boundary of the Gray Region (UBGR), or the DCGL, minus the Lower Bound of the Gray Region (LBGR),

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

The optimal value for ~/cr should range between one (1) and three (3). The largest value the

~/cr can have is three (3). If the calculated value of Mcr exceeds three (3), an adjusted value of three (3) will be used for Mcr. The ~/cr for survey unit B3-012-109, based on the amalgamated gross measurement data from characterization of the LACBWR above grade buildings to remain at license termination, was calculated as follows:

Equation 4

~/cr = 1580/473 = 3.34 As the calculated relative shift was greater than three (3), a value of three (3) was used as the adjusted Mcr. Both the Type I error (i.e., a value) and the Type II error (i.e., value) was set at 0.05. The sample size from Table 5.5 of MARSSIM that equates to the Type I and Type II error of 0.05 for use with the Sign test is an N value of fourteen (14).

A Prospective Power Curve was generated using COMPASS, a software package developed under the sponsorship of the United States Nuclear Regulatory Commission (USNRC) 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.

As the survey unit was designated Class 3, measurement locations were selected at random.

The random locations of the static measurements were selected using Visual Sample Plan (VSP). Input parameters included the use of survey unit drawings and the random sampling tool set with a predetermined number (14) of samples. The random measurement locations were identified in the field using dimension parameters provided on the survey unit map (see Attachment 1). Table 5-1 lists the random, judgmental, and QC measurements collected for FSS of survey unit B3-012-109.

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Table 5-1 Survey Unit B3-012-109 Measurement Designations Measurement ID B3-012-109-FRWW-001-BD B3-012-109-FRWM-002-BD B3-012-109-FRWM-003-BD B3-012-109-FRCW-004-BD B3-012-109-FRFC-005-BD B3-012-109-FRWM-006-BD B3-012-109-FRWM-007-BD B3-012-109-FRFC-008-BD B3-012-109-FRCW-009-BD B3-012-109-FRWM-010-BD B3-012-109-FRRA-011-BD B3-012-109-FRWW-012-BD B3-012-109-FRRA-013-BD B3-012-109-FRFC-014-BD B3-012-109-FJWM-015-BD B3-012-109-FQWM-007-BD The implementation of quality control measures as referenced in LTP, Section 5.9 and LaCrosseSolutions LC-QA-PN-001, Final Status Survey Quality Assurance Project Plan (QAPP) (Reference 10) includes the collection of a replicate measurement on 5% of the measurements collected in a survey unit, with the locations selected at random. One (1) replicate measurement, B3-012-109-FQWM-007-BD, was selected at random for the QC replicate measurement analysis for the FSS of this survey unit.

LTP Chapter 5, Section 5.6.4.4 and Table 5-15 specifies that for Class 3 structure survey units, surface scans will be performed on a judgmental percentage of the surface area in the survey unit. Typically, surface scans would be performed judgmentally on areas with the greatest potential for contamination. In the absence of any peculiar features identified during the survey unit walkdown that would indicate contamination, and because historical radiological information did not provide sufficient evidence for increased contamination potential, the survey design elected that scanning be performed at random. This allowed for the even distribution of scan surveys around the entire survey unit. For survey unit B3-012-109, 10% scan coverage was selected, which equates to 12.2 m 2. Fourteen (14) scan areas (one [1] 1 m2 scan area at each random measurement location), covering 14 m 2 of the survey 12

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS unit (more than the required minimum), were established. Refer to Attachment 1 for figures and maps depicting the measurement and scan locations in survey unit B3-012-109.

For this Class 3 structure survey unit, the "Investigation Levels" for area scanning and direct measurement results are those levels specified in the LTP, Table 5-16, and are reproduced below in Table 5-2.

Table 5-2 Investigation Levels Direct Investigation Classification Scan Investigation Levels Levels

>Operational DCGL or >MDC scan if Class 3 MDCscan is greater than Operational >50% Operational DCGL DCGL Table 5-3 provides a synopsis of the survey design for survey unit B3-012-109.

Table 5-3 Synopsis of Survey Design Feature Design Criteria Basis Survey Unit Surface Area 122 m2 Building Dimensions

  • cr = 473
  • UBGR = 3,160 Number of Random 14
  • LBGR = 1,580 Measurements (N)
  • Type I & II error = 0.05
  • Mcr = 3 (adjusted)
  • MARSSIM Table 5.5 Adjusted Gross Operational DCGL/Action Level 3,160 dpm/100 cm2 DCGL (Equation 2)

>50% Operational DCGL (1,580 Direct Investigation Level LTP, Table 5-16 dpm/100 cm2)

Scan Investigation Level >Operational DCGL or >MDCscan LTP, Table 5-16 14 m2 or ~10% areal coverage LTP, Table 5-15 Scan Areal Coverage 15 m2 (with 1 judgmental grid) or Actual Scan Coverage

~13%

Judgmental Measurements 1 Per Survey Design 1 replicate measurement selected QC LTP, Section 5.9 at random location 13

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS

6. SURVEY IMPLEMENTATION For survey unit B3-012-109, compliance with the unrestricted release criteria was demonstrated through a combination of surface scanning and surface static measurements with a Ludlum Model 44-116 beta/gamma detector.

An FSS Supervisor performed a visual inspection and walk-down of the survey unit during the Unconditional Release Survey (URS) that was performed prior to FSS. The purpose of the walk-down was to assess the physical condition of the survey unit, evaluate access points and travel paths, and identify potentially hazardous conditions. At the time of FSS, the interior of the building was dry, and the exterior (in areas not subject to random surveys) was sparsely covered (nearest to the ground) with ice. The grounds around the building were muddy and partially covered in snow, making travel paths a safety concern. No conditions prohibited the proper collection of static and scan measurements.

FSS field activities were conducted under the FSS Sample Plan, which included DQOs, survey design, detailed FSS instructions, job safety analysis, and related procedures for reference. FSS field activities were projected to take four (4) working days to complete.

Daily briefings were conducted to discuss the expectations for job performance and to review safety aspects of the job. A "Field Log" was used to document field activities and other information pertaining to the performance of the FSS. FSS field activities commenced on February 13, 2019 and were concluded on February 14, 2019.

A total of fifteen (15) different scan areas (fourteen [14] random and one [1] judgmental),

constituting an area coverage of 15 m2, were scanned using a Ludlum 2350-1 paired with a Ludlum Model 44-116 detector (125 cm2 detector area). The background was established as the average of five (5) 1-minute static measurements, while maintaining the detector waist high with the detector face pointed away from the surface of interest. In survey unit B3-012-109, background ranged from 182 cpm up to 193 cpm.

All designated scan areas were scanned using a Ludlum 2350-1 paired with a Model 44-116 beta/gamma detector operated in the rate-meter mode and using audio response. The probe was positioned as close to the surface as possible and was moved at a scan speed of approximately one (1) detector width per second. Scan MDC was sufficient to detect residual radioactivity at the action level of 1,580 dpm/100cm 2 (50% of Adjusted Gross Operational DCGL). Complete scan results are provided in Attachment 2.

The fourteen (14) random static measurement locations were marked based on the dimensions provided on the survey map. One (1) judgmental measurement location was selected and marked as per the sample plan. Using the Ludlum 2350-1 paired with a Model 44-116 detector, a 1-minute static measurement was acquired at each designated random and judgmental survey location.

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS The implementation of survey specific QC measures included the collection of one (1) replicate static measurement (B3-012-109-FQWM-007-BD) for QC analysis.

7. SURVEY RESULTS All areas identified in the FSS plan were scanned for elevated radiation levels. No alarms were produced during the scanning of survey unit B3-012-109. Table 7-1 provides an overview of the scan results. Complete scan results are provided in Attachment 2.

Table 7-1 Synopsis of Scan Results Highest Action # of Logged Investigation Scan Area Level(1) Scan Reading Measurements Alarms (cpm) (cpm) 1 264 403 0 0 2 266 403 0 0 3 191 403 0 0 4 292 403 0 0 5 360 403 0 0 6 257 403 0 0 7 215 403 0 0 8 251 403 0 0 9 272 403 0 0 10 293 403 0 0 11 354 387 0 0 12 275 403 0 0 13 251 387 0 0 14 261 403 0 0 15 221 403 0 0 7 QC 231 387 0 0 (1) Action Level based on the average background plus MDCR Surveyor. MDCRSurveyor = (1.38jBackground(fo)60)/'10.S .

Background was subtracted from all measurements, then were converted from cpm to dpm/100 cm2 (net cpm divided by detector efficiency) for direct comparison to the Adjusted Gross DCGLs. Table 7-2 below presents the detector efficiencies used for conversions. A summary of the results for the fourteen (14) random static measurements, one (1) judgmental static measurement, and one (1) QC static measurement is provided in Table 7-3. The basic statistics for the random measurement population are summarized in Table 7-4.

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Table 7-2 Detector Efficiencies44-116 Efficiency Detector # (c/d)

PR 357439 0.2381 PR 357009 0.2047 Table 7-3 Summary of Random, Judgmental, and QC Static Measurements Gross Activity Fraction of Measurement ID Adjusted Gross (dpm/100 cm2) OpDCGL B3-012-109-FRWW-001-BD 0 0.0000 B3-012-109-FRWM-002-BD 0 0.0000 B3-012-109-FRWM-003-BD 0 0.0000 B3-012-109-FRCW-004-BD 34 0.0106 B3-012-109-FRFC-005-BD 118 0.0372 B3-012-109-FRWM-006-BD 8 0.0027 B3-012-109-FRWM-007-BD 0 0.0000 B3-012-109-FRFC-008-BD 25 0.0080 B3-012-109-FRCW-009-BD 0 0.0000 B3-012-109-FRWM-010-BD 0 0.0000 B3-012-109-FRRA-011-BD 156 0.0495 B3-012-109-FRWW-012-BD 0 0.0000 B3-012-109-FRRA-013-BD 215 0.0680 B3-012-109-FRFC-014-BD 42 0.0133 B3-012-109-FJWM-015-BD 0 0.0000 B3-012-109-FQWM-007-BD 0 0.0000 Table 7-4 Basic Statistical Properties of Random Measurement Population Adjusted Mean Mean Median Max Min Std. Dev. Gross Adjusted BcDCGL Gross Dose BcDCGL (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2) (dpm/100cm2)

Fraction 43 0 215 0 66 19751 0.0022 0.0541 16

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS The mean activity from random static measurements was divided by the Adjusted Gross Base Case DCGL to derive a mean fraction. The mean fraction was then multiplied by twenty-five (25) mrem/yr to calculate the dose attributed to the survey unit. For survey unit B3-012-109, the calculated dose from residual activity is 0.0541 mrem/yr.

8. QUALITY CONTROL The implementation of survey specific QC measures included the collection of one (1) replicate static measurement (B3-012-109-FQWM-007-BD) for QC analysis. The acceptance criterion for replicate static measurements is that the same conclusion is reached for each measurement. The acceptance criterion is satisfied if the replicate measurement is within 20% of the standard measurement. In cases where the replicate measurement is not within 20% of the standard measurement, but both measurements are below the Operational DCGL as well as the static MDC, there is an acceptable agreement. The QC replicate measurement fell within the 20% criteria, and there is an acceptable agreement between standard and replicate results. Refer to Attachment 4 for QC analysis results.
9. INVESTIGATIONS AND RESULTS No investigations were performed during the performance or analyses of the survey.
10. REMEDIATION AND RESULTS No radiological remedial action as described by MARSSIM Section 5.4 was performed in this survey unit prior to or as a result of the FSS. Chapter 4 of the LTP determined that remediation beyond that required to meet the release criteria is unnecessary and that the remaining residual radioactivity in above grade buildings was ALARA.
11. CHANGES FROM THE FINAL STATUS SURVEY PLAN There were no addendums to the FSS plan.
12. DATA QUALITY ASSESSMENT (DQA)

The DQO sample design and data were reviewed in accordance with LC-FS-PR-008, Final Status Survey Data Assessment (Reference 11) for completeness and consistency.

Documentation was complete and legible. Scan surveys and the collection of static measurements were consistent with the DQOs and were sufficient to ensure that the survey unit was properly designated as Class 3. The survey design had adequate power as indicated by the Retrospective Power Curve (see Attachment 5).

17

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS The measurement results indicated that all measurements were less than 50% of the Adjusted Gross Operational DCGL.

Although MARSSIM states that the Sign test need not be performed in the instance that no measurements exceed the DCGL, the test was conducted to demonstrate coherence to the statistical principles of the DQO process. The Sign test was performed on the data and compared to the original assumptions of the DQOs. The evaluation of the Sign test results clearly demonstrates that the survey unit passes the unrestricted release criteria, thus, the null hypothesis is rejected.

The preliminary data review consisted of calculating basic statistical quantities (e.g., mean, median, standard deviation). The mean and median values of the data were well below the Adjusted Gross Operational DCGL. Also, the retrospective power curve shows that a sufficient number of measurements 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 survey unit data is presented graphically through a frequency plot and quantile plot. All graphical presentations are provided in Attachment 5.

13. ANOMALIES No anomalies were observed during the performance or analyses of the survey.
14. CONCLUSION Survey unit B3-012-109 has met the DQOs of the FSS plan. The ALARA criteria as specified in Chapter 4 of the LTP were achieved.

The sample data passed the Sign test. The null hypothesis was rejected. The Retrospective Power Curve showed that adequate power was achieved. The survey unit is properly classified as Class 3. Therefore, in accordance with the LTP, Section 5.11, the survey unit meets the release criteria.

The dose contribution from survey unit B3-012-109 is 0.0541 mrem/yr TEDE, based on the mean activity of measurements used for non-parametric statistical sampling.

Survey unit B3-012-109 is acceptable for unrestricted release.

15. REFERENCES
1. LC-FS-PR-009, Final Status Survey Data Reporting
2. La Crosse Boiling Water Reactor License Termination Plan
3. LC-FS-PR-015, Final Status Surveys for Structures 18

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS

4. LC-FS-PR-002, Final Status Survey Package Development
5. NUREG-1575, Revision 1, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM)
6. La Crosse Boiling Water Reactor Historical Site Assessment
7. RS-TD-313196-001, Radionuclides of Concern During LACBWR Decommissioning
8. NUREG-1757, Volume 2, Revision 1, Consolidated Decommissioning Guidance Characterization, Survey, and Determination of Radiological Criteria, Final Report
9. LC-FS-TSD-002, Operational Derived Concentration Guideline Levels for Final Status Survey
10. LC-QA-PN-001, Final Status Survey Quality Assurance Project Plan
11. LC-FS-PR-008, Final Status Survey Data Assessment
16. ATTACHMENTS Attachment 1 Figures and Maps Attachment 2 Scan Data Attachment 3 Sign Test Attachment 4 Quality Control Assessment Attachment 5 Graphical Presentations Attachment 6 Ludlum 2350-1 Download Reports 19

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS ATTACHMENT 1 FIGURES AND MAPS 20

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Figure 16-1 Survey Unit B3-012-109 Random and Judgmental Measurement Locations Map

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS ATTACHMENT 2 SCAN DATA 22

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Table 16-1 Survey Unit B3-012-109 Complete Scan Data Scan Avg Action Detector Detector M2350-1 Logged Scan Location Background Level(1)

Type ID ID Result Alarms (cpm) (cpm) (cpm)44-116 357439 325261 1 264 193 403 0 44-116 357439 325261 2 266 193 403 0 44-116 357439 325261 3 191 193 403 0 44-116 357439 325261 4 292 193 403 0 44-116 357439 325261 5 360 193 403 0 44-116 357439 325261 6 257 193 403 0 44-116 357439 325261 7 215 193 403 0 44-116 357439 325261 8 251 193 403 0 44-116 357439 325261 9 272 193 403 0 44-116 357439 325261 10 293 193 403 0 44-116 357009 325246 11 354 182 387 0 44-116 357439 325261 12 275 193 403 0 44-116 357009 325246 13 251 193 387 0 44-116 357439 325261 14 261 193 403 0 44-116 357439 325261 15 221 193 403 0 44-116 357009 325246 7 QC 231 182 387 0 (1) Action Level based on the average background plus MDCR Surveyor. MDCRsurveyor = (1.38jBackground(:0 )60 )/../ff.5 23

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS ATTACHMENT 3 SIGN TEST 24

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Table 16-2 Survey Unit B3-012-109 Sign Test SOF

  1. 1-WS Sign (WS) 1 0.0000 1.00 +1 2 0.0000 1.00 +1 3 0.0000 1.00 +1 4 0.0106 0.99 +1 5 0.0372 0.96 +1 6 0.0027 1.00 +1 7 0.0000 1.00 +1 8 0.0080 0.99 +1 9 0.0000 1.00 +1 10 0.0000 1.00 +1 11 0.0495 0.95 +1 12 0.0000 1.00 +1 13 0.0680 0.93 +1 14 0.0133 0.99 +1 Number of positive differences (S+) 14 Critical Value 10 Survey Unit Meets the Acceptance Criteria 25

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS ATTACHMENT 4 QUALITY CONTROL ASSESSMENT 26

FSS RELEASE RECORD REVISION 1 SECURITY STATION SURVEY UNIT B3-012-109 Table 16-3 Survey Unit B3-012-109 QC Assessment Activity Activity Within Standard -20% +20% Comparison (dpm/100cm2) (dpm/100cm2) 20%

B3-012-109-FRWM-007-BD 0 0 0 B3-012-109-FQWM-007-BD 0 Y 27

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS ATTACHMENT 5 GRAPHICAL PRESENTATIONS 28

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Figure 16 Quantile Plot for Gross Activity 250 200 N

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Figure 16 Histogram for Gross Activity 12 10 8

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36 72 107 143 179 215 UPPER END VALUE (DPM/100CM 2) 30

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS Figure 16 Retrospective Power Curve for Survey Unit B3-012-109 P ob ilL 1.0 I

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SURVEY UNIT B3-012-109 LACROSSESOLUTIONS ATTACHMENT 6 LUDLUM 2350-1 DOWNLOAD REPORTS 32

B3-012-109 Probe Serial Sample Survey Unit D=Direct Source Detector Logged Units Count Logging Alarm=l No Inst Serial Tech Model Number Number Grid Location S=Scan BKG Check Date/ Time Setup Reading (cpm) Time Mode(min) Alarm=O Number Name 44-116 357009 0 B3109 BD PRBKG 2/14/2019 7:03 2 178 C 60 1 0 325246 SB 44-116 357009 1 B3109 BD PRCHK 2/14/2019 7:06 2 2475 C 60 1 1 325246 SB 44-116 357009 2 B3109 FLDBK BO 2/14/2019 9:00 2 177 C 60 1 0 325246 SB 44-116 357009 3 B3109 FLDBK BD 2/14/2019 9:01 2 181 C 60 1 0 325246 SB 44-116 357009 4 B3109 FLDBK BD 2/14/2019 9:03 2 184 C 60 1 0 325246 SB 44-116 357009 5 B3109 FLDBK BD 2/14/2019 9:04 2 186 C 60 1 0 325246 SB 44-116 357009 6 B3109 FLDBK 8D 2/14/2019 9:05 2 184 C 60 1 0 325246 SB 44-116 357009 7 B3109 11 BS 2/14/2019 9:37 2 354 C 0 0 0 325246 SB 44-116 357009 8 B3109 11 BD 2/14/2019 9:39 2 214 C 60 1 0 325246 SB 44-116 357009 9 B3109 13 BS 2/14/2019 10:04 2 251 C 0 0 0 325246 SB 44-116 357009 10 B3109 13 BD 2/ 14/2019 10:07 2 226 C 60 1 0 325246 SB 44-116 357009 13 B3109 BD PSBKG 2/14/2019 12:08 2 211 C 60 1 0 325246 SB 44-116 357009 14 B3109 BD PSCHK 2/14/2019 12:12 2 2507 C 60 1 1 325246 SB Reviewed By: w1?- Pag ~

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