ML051950491
| ML051950491 | |
| Person / Time | |
|---|---|
| Site: | Saxton File:GPU Nuclear icon.png |
| Issue date: | 07/08/2005 |
| From: | Kuehn G GPU Nuclear Corp |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| E910-05-030 | |
| Download: ML051950491 (50) | |
Text
N U NUCLEAR GPU Nuclear, Inc.
Three Mile Island Nuclear Station Route 441 South Post Office Box 480 Middletown, PA 17057-0480 Tel 717-948-8461 July 8, 2005 E910-05-030 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Gentlemen, Subject Saxton Nuclear Experimental Corporation (SNEC)
Operating License No., DPR-4 Docket No. 50-146 FSS Report for the Penelec Switch Yard The purpose of this letter is to submit for your review the attached FSS Report for Penelec Switch Yard. One CD-ROM is included in this submission. The CD-ROM labeled: FSS Report for Penelec Switch Yard - Publicly Available" contains the following 21 files:
Document Title File Name File Size (Mbytes)
Main Report 001 FSS Report - Penelec 0.576 Main_________
ReprtSwitch Yard.pdf Appendix A-1 (pages 1 to 9)
-002 Appendix A -1 (1-9).pdf 37.9 Appendix A-1 (attachments 1-1 to 4-3) 003 Appendix A -I(attachment 4-36.1 I to 4-3).pdf Appendix A-1 (attachment 5-1 to 9-2) 004 Appendix A-I (attachment 5-41.2 (attahmentI to 9-2).pdf Appendix A-2 005 Appendix A-2.pdf 8.13 Appendix B-1(pages 1 - 11) 006 Appendix B-1 (I-11).pdf 46.5 Appendix B-1 (attachment 1-1 to 1-8) 007 Appendix B-1 (attachment 1-47.3 Appendix B-I (attachment 1-9 to 1-13) 0x to 1(
e 1pdf42.8 Appendix B-1 (attachment 1-14 to 1-009 Appendix B-1 (attachment 1-34.0
- 17) 14 to 1-1__).pdf Appendix B-1 (attachment 1-18 to 1-010 Appendix B-1 (attachment 1-31.8
- 21) 18 to 1-21).pdf Appendix B-1 (attachment 1-22 to 2-4) 011 Appendix B- (attachment 1 -
34.1 Appendix B-1(attachment2-5 to 3-1)22 to 2-4).pdf Appendix B-l (attachment 2-5 to 3-1) 01 2 Appendix B-I (attachment 2-30.3
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _5 to _3 -I1 ).p d f l
I ;
,I.
GmU NUCLEAR GPU Nuclear, Inc.
Three Mile Island Nuclear Station Route 441 South Post Office Box 480 Middletown, PA 17057-0480 Tel 717-948-8461 Appendix B-1 (attachment 4-1 to 5-4) 013 Appendix B-I (attachment 4-26.9 Appendix_______________6-1_to_10-1)1 to 5-4).pdf Appendix B-1 (attachment 6-1 to 10-1) 014 Appendix B-1 (attachment 6-29.5 1)_
1-1 to 10-1).pdf Appendix B-1 (attachment 11-1 to 12-015 Appendix B-1 (attachment 11.6 I)
Il-I to 12-1).pdf Appendix B-I (attachment 13-I to 14-016 Appendix B-I (attachment 26.5
- 3) 13-1 to 14-3).pdf Appendix B-2 017 Appendix B-2.pdf 12.3 Appendix C-1 (1-10) 018 Appendix C-1 (1-10).pdf 41.4 Appendix C-1 (attachment 1-1 to 2-1) 019 Appendix C-1 (attachment 1-23.8 to 2-1).pdf Appendix C-1 (attachment 3-1 to 5-2) 020 Appendix C-I (attachment 3-19.2 Appendix____
C-2 021 Aeto 5-2).pdf 14.2 Appendix C-2 1
021 Appendix C-2.pdf 14.2 If you have any questions on this information, please contact Mr. Art Paynter at (814) 635-4384.
Program Director, SNEC cc:
NRC Project Manager NRC Project Scientist, Region 1 Mr. Tim Bauer, ORISE Project Leader 2
Final Status Survey Report For Saxton Nuclear Experimental Corporation PENELEC Switch Yard Area The PENELEC Switch Yard Area - Old Photo Showing Approximate Position of Remaining Section of the PENELEC Switch Yard Relative to Other Site Area Landmarks Prepared by GPU Nuclear, Inc.
July 2005 CO\\
Final Status Survey-PENELEC Switch Yard Table of Contents Section No.
Page Executive Sum m ary............................................................................................................. 1
1.0 Purpose and Scope
4 2.0 Survey Area Description............................................................
4 2.1 Overview 4
2.2 0L12-1 Open Land Area 5
2.2 OL12-1 Ope Land A.............................................................................,,,,,,,,,,...
2.3 The PENELEC Switch Yard Class I and 2 Open Land Area 5
2.4 PENELEC Switch Yard Class I Structures.5 2.5 PENELEC Switch Yard Class 3 Structures 6
3.0 Operating History..................................................................................................
7 3.1 OL12-1 Open Land Area 7
3.2 PENELEC Switch Yard 8
3.2.1 PENELEC Switch Yard Remediation Status 8
3.3 SNEC Facility Plant Operations 8...............................
8 4.0 Site Release Criteria 9
4.1 OL12-1 Area Specific DCGLw Values 10 4.2 PENELEC Switch yard DCGLw Values 10 5.0 Final Status Survey Design/DQO Process 1.
5.1 Survey Design for the OL12-1 Open Land Area,................................... 1.3 5.2 Survey Design for the PS4-1 and PS4-2 Open Land Areas 14 5.3 Survey Design for the PS3-2 Class I Structural Material 1 6 5.4 Survey Design for the PS3a-1 and PS3b-1 Class 3 Structural Material.16 6.0 Final Status Survey Results 1,8 6.1 Summary of Survey Results for OL12-1 Open Land Area 18 6.2 Summary of Survey Results for PS4-1 Open Land Area 19 6.3 Summary of Survey Results for PS4-2 Open Land Area 21 6.4 Summary of Survey Results for PS3-2 Structural Surfaces,2,3 6.5 Summary of Survey Results for PS3a-1 Structural Surfaces 24 6.6 Summary of Survey Results for PS3b-1 Structural Surfaces 25 7.0 Data Assessment 28.
i
Final Status Survey - PENELEC Switch Yard Table of Contents (continued)
Section No.
Page 7.1 Assessment Criteria 28 7.2 Survey Variations 29 7.2.1 Impact of Electrical Hazards 29 7.2.2 Sampling in the Switch yard Area 29 7~~~~~~~~~~~~~~.3QaiyCnrlmaueet,,,,,,,,,,,,,,,,,,........................................,,,,, 3......
7.3 Quality Control measurements 30.
7.4 Assessment Summary............................................,
30 8.0 Final Status Survey Conclusions......................................................................
.30 9.0 References 31.
9.0 References,,,.........
................................................,,..,........,.........................................,,,,,,,,,,,,,,,,,,,,,,,,1 10.0 Appendices 10.1 Appendix A SNEC Calculation No. E900-05-021, 'OL11 & Remaining 0L12 Open Land Area - Survey Design", April 8, 2005.
10.2 Appendix A Survey Request Summary Results for SR-021 1 (0L12-1).
10.3 Appendix B SNEC Calculation No. E900-05-002, "PENELEC Switch Yard, Class 1 Area - Survey Design", March 14, 2005.
10.4 Appendix B Survey Request Summary Results for SR-01 93 (PS3a-1, PS3-2
& PS4-1).
10.5 Appendix C SNEC Calculation No. E900-05-003, "PENELEC Switch Yard, Class 2 Area - Survey Design", March 14, 2005.
10.6 Appendix C Survey Request Summary Results for SR-0194 (PS3b-1 & PS4-2).
ii
Final Status Survey - PENELEC Switch Yard List of Figures Figure No.
Title Page 1
The PENELEC Switch Yard Area - Old Photo Showing Approximate...
Cover 2
PENELEC Switch Yard Open Land Areas 0L12-1, PS4-1 and PS4-2 1
3 PENELEC Switch Structural Areas PS3-2, PS3a-1 and PS3b-1 2
4 Northeast Corner of PENELEC Switch Yard Showing Class 1 Area Drainage...
6 5
Southern Sector of the Switch Yard Showing Class 3 Unpainted Concrete...
7 iii
Final Status Survey - PENELEC Switch Yard List ol Table 1
2 3
4 5
6 7
8 9
10 11 12 13 14 15
' Tables No.
Title OL12-1 Open Land Area DCGLw Values PENELEC Switch Yard DCGLw Values DQO/Design Parameters/Results - Open Land Area DQO/Design Parameters/Results - Structures 0L12 SR-211 Sample Results PS4 SR-193 Sample Results PS4-1 Alarm Point Investigation Results EMC Calculation for PS4-1 Area (1,614 M2)
PS4 SR-194 Sample Results PS4-2 Alarm Point Investigation Results PS3 SR-193 Sample Results PS3a SR-193 Sample Results PS3b SR-194 Sample Results Elevated Measurement Areas (PS3b-1)
PS3b SR-194 Concrete Sample Results Page 10 10 12 13 18 19 20 21 22 23 24 25 26 27 28 iv
Final Status Survey - PENELEC Switch Yard Executive Summary This report presents the results and conclusions of the Final Status Survey (FSS) conducted by GPU Nuclear, Inc. within the PENELEC Switch Yard area (El. 811'). This area includes a small section of open land area designated OL12-1 (see Figure 1), outside the Switch Yard fence that extends along the western, and portions of the southern and northern borders of the Switch Yard. This FSS report provides applicable summary results from surface measurements and volumetric sampling from these areas. The work associated with this FSS was performed in accordance with the SNEC License Termination Plan (LTP) (Reference 9.1), and was performed between March of 2005 and April 2005. The open land area associated with this report is shown in the following diagram as survey unit designations PS4-1, PS4-2 and 0L12-1.
131 137 136 135 134 133 132 131 130 129 128 PENELEC SWITCH YARD OPEN LAND AREA I
II I
I II I
BH
.l.
BO. -
-X L4'_-Cb TOT AG_
L_.- _ L_,,,ax.,
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L1 BF BE-B~C
_._.__d =._ -
S--
SUBS1 ATIO BA L
A 1 L _ =_AI AY VL_
ESS" r 1 11 ftrT ov>oI F
Figure 2, Showing a section of the SNEC Facility site map and the PENELEC Switch Yard (SY) open land area with current survey unit designations.
The original area Classification map found in the SNEC LTP (Reference 9.1), listed the Switch Yard as being part of four site areas; OL1, 0L2, OL4 and 0L8. A re-evaluation of the area Classification placed the Switch Yard in only three areas; OL1, OL2 and 0L12. However, OL1 should have ceased at the southern fence line and not at the grid line just beyond the fence.
This error was corrected during the survey design process. The survey design also re-designated the Switch Yard open land areas into more appropriate survey unit names. None of these changes lowered previous survey area Classifications as stated in Reference 9.1.
1
Final Status Survey - PENELEC Switch Yard The approximate locations of structures within the Switch Yard that have been identified for survey work are shown on the diagram of Figure 2. With the exception of the PS3-2 survey unit, these structures are all classified as Class 3 survey units. These structures have been surveyed in accordance with Class 2 survey criteria. Because of personnel safety concerns, only a portion of the surface area represented by the survey unit designations (shown in Figure 3), was available for FSS activities (a limited survey approach).
Figure 3. A Section of SNEC Facility site map showing areas where structural materials were identified for survey work.
Of the three groups of structural materials shown on Figure 3 (excluding the Switch yard Control building), only PS3-2 was designated a Class 1 survey unit. The PS3-2 structures contain two (2) Class 1 concrete block walls that reside in the heart of the Class 1 open land area. These walls act as head walls for the yard area drainage system. The surrounding area was previously remediated and consequently both block wall sections are classified as Class 1 structures with one designation (PS3-2).
The PENELEC Switch Yard Substation is an active operational facility. It contains energized electrical equipment and high voltage transport systems capable of delivering lethal electrical discharges well over 100,000 volts. Consequently, a limited survey approach is necessary in this hazardous environment.
2
Final Status Survey - PENELEC Switch Yard The PENELEC Switch Yard survey data was collected from each survey unit according to data collection requirements specified in FSS design criteria. The following types of measurements were performed on materials and locations within the PENELEC Switch Yard (fenced in area),
and the open land area designated 0L12-1:
- 1. Nal scanning measurements were performed in the accessible portions of PS4-1, PS4-2 and OL1 2-1, which represents approximately 6,400 m2 of Class 1 and Class 2 open land area combined. A portion of this area is unapproachable because of electrical hazards within the Switch Yard. Alarm points were thoroughly investigated.
- 2. Not counting QC sampling, repeat sampling and investigations, a total of 78 soil/soil-like material samples were obtained using a random start systematically spaced triangular grid system. These samples were analyzed by gamma spectroscopy.
- 3. Gas Flow Proportional Counter (GFPC) scan measurements were performed on approximately 149 m2 of Class 3 concrete in PS3a-1, and about 362 m2 of Class 3 structural concrete in PS3b-1. In addition, about 4 m2 of the Class 1 concrete block was scanned as survey unit PS3-2.
- 4. Static GFPC measurements, using a random start systematically spaced triangular grid system were performed on survey units PS3a-1, PS3b-1 and PS3-2. Sampling of elevated measurement areas resulted in extremely low concentrations of Cs-137 per unit area.
The mean concentration of Cs-137 was less than the applicable DCGLw in each respective survey unit. Areas where alarm points were exceeded were investigated as required by the SNEC LTP (Reference 9.1). Additional samples or measurement results collected as a result of exceeding alarm points were investigated in accordance with SNEC LTP requirements.
Therefore, this collection of FSS data demonstrate that each survey unit meets the radiological criteria for unrestricted use specified in 10 CFR 20.1402 (Reference 9.2).
Based on the results of this final status survey effort, GPU Nuclear, Inc. concludes that the OL12-1 open land area, and the PENELEC Switch Yard area (excluding the Switch Yard Control building which will be addressed in a separate report), meet the NRC requirements for release to unrestricted use.
3
Final Status Survey - PENELEC Switch Yard
1.0 Purpose and Scope
This report presents the results and conclusions of the final status survey performed on the following areas and structures:
- 1.
PENELEC Switch Yard Class 3 unpainted concrete base pads and pedestals (PS3a-1 and PS3b-1)
- 2.
PENELEC Switch Yard Class 1 concrete block (PS3-2)
- 3.
PENELEC Switch Yard Class 1 open land area (PS4-1)
- 4.
PENELEC Switch Yard Class 2 open land area (PS4-2)
- 5.
Open Land Area adjacent to the PENELEC Switch Yard fence on the northern, western and southern perimeter (0L12-1)
These surveys provide the information required by 10 CFR 50.82(a)(11) (Reference 9.3) and the SNEC License Termination Plan (LTP), and demonstrate that these areas meet the radiological criteria for unrestricted use specified in 10 CFR 20.1402.
2.0 Survey Area Description 2.1 Overview The PENELEC Switch Yard is contained within the area formed by site grid markers BG-137 and AY-137 on the west, and BF-128 and AY-128 on the east (Reference 9.4). The area is largely open land area, but contains an active electrical distribution facility (substation) south of the BD horizontal site grid line. In the substation area, base concrete pedestals and supports provide a lower buttress for steel superstructure that positions and stabilizes high voltage cabling, transformers and electrical switching components. The Switch Yard electrical distribution system is a combination of old and new equipment and base support construction. The older base pads and pedestal concrete are in poor condition while the newer structures and components have been added in more recent years.
A layer of crushed stone covers a large portion of the Switch Yard open land area and portions of 0L12-1. The material was added to improve accessibility for PENELEC employees who service power handling equipment, and has been added 'as needed" since the shut down of the SNEC reactor facility. A grounding mat is positioned below the surface at a depth of about sixteen (16) inches (more or less). and covers the Switch Yard footprint and portions of the OL12-1 area as well. Soil sampling below this depth is not permitted because of possible damage to the yards grounding system.
4
Final Status Survey - PENELEC Switch Yard 2.2 OL12-1 Open Land Area The PENELEC Switch Yard is located on the site grid map within the OL1, 0L2 and OL12 areas, but for purposes of FSS work has been re-designated individual survey unit names.
The Class 1 area (east of vertical grid line 131), has been designated PS4-1 and the Class 2 area west of vertical grid marker 131 has been designated PS4-2.
The OL12-1 area is a relatively small area (less than two (2) grids across at the widest point), which borders the Switch Yard fence line along the western, northern and southern sides (see Figure 1). It was originally part of the larger Switch Yard facility that existed during the time when the Saxton Steam Generating Station (SSGS) facility was in operation (see cover photo). The western segment of the OL12-1 area that runs vertically along the PENELEC Switch Yard fence line and is about two (2) meters wide (or less), and the entire area is a continuation of the same material types found in OL1-1, and in the Switch Yard general area. The Switch Yard grounding mat extends into OL12-1 at a depth of about sixteen (16) inches. Damaging this important operational and safety related component by sampling from above was not permitted.
2.3 The PENELEC Switch Yard Class 1 and 2 Open Land Area From Figure 3, the eastern Class 1 open land area (PS4-1) is approximately 1,600 square meters in area. The western sector, or Class 2 open land area (PS4-2) is less than about 3,600 square meters in total area'. Cinders, ash, soil, and stones make up the vast majority of material types found in the Switch Yard. A recent addition of crushed stone tops off a significant portion of the area and is six inches deep or more at some locations.
Sampling instructions for this area required two (2) samples at each selected location. The first sample included the more recently placed upper stone layer and the second was taken of older materials below the surface that are thought representative of materials at the depth of the grounding mat.
2.4 PENELEC Switch Yard Class I Structures A portion of the substation drainage system empties into an adjacent drainage ditch area (see Figure 4). The drainage ditch is located in the eastern sector of the Switch Yard, and empties through drain pipe to the northern most portion of the 0L2 open land area (Reference 9.4). Two (2) small head walls made of concrete block are located in this Area estimate includes some area covered by support structures.
5
Final Status Survey - PENELEC Switch Yard Class 1 area. These two structures (designated PS3-2) are considered one (1) survey unit of 4.2 square meters in total surface area.
Figure 4. Northeast comer of PENELEC Switch Yard showing Class 1 area drainage ditch.
2.5 PENELEC Switch Yard Class 3 Structures In the southern portion of Switch Yard, unpainted concrete base-pads and pedestals, and painted steel support structures cover a majority of the area within the substation. Many of these structures are in areas that prohibit survey work because of high voltage concerns.
All of these structures are considered Class 3 survey units (Table 5-2, Reference 9.1).
This is a hazardous area, where switch-gear and cabling carry thousands of volts of electrical energy. While a resolute effort was made to survey a significant portion of this facility, personnel safety issues took precedence. Thus survey work in the substation area was on a limited basis2. Metal surfaces were not surveyed in any portion of the Switch Yard except within and around the Switch Yard Control building.
The amount of Class 3 unpainted concrete surface area in the Class 1 open land area survey unit that could potentially be accessed was determined to be about 187 square meters (west of vertical site grid line 131). These surfaces (collectively) are considered one survey unit and were designated PS3a-1.
2 limited survey approach that required special training by PENELEC line personnel.
6
Final Status Survey - PENELEC Switch Yard In the Class 2 open land area (PS4-2), the amount of unpainted concrete surfaces that were thought available for survey work was estimated to be about 414 square meters of horizontal surface area. This structure was designated PS3b-1, and includes accessible unpainted concrete structures west of the site's 131 vertical grid line, and south of the BA horizontal grid line). It also includes the walk way north of the Switch Yard Control Building. These surfaces are considered one survey unit designated PS3b-1. See Figure 5 below.
Figure 5. Southern sector of the Switch yard showing Class 3 unpainted concrete structures.
3.0 Operating HistorV 3.1 OL12-1 Open Land Area No operational history is available for the OL12-1 area. However, a portion of a larger substation that existed at the time when the Saxton Steam Generating Station (SSGS) was operational, was partially positioned in what appears to be a section of the OL12-1 area (see cover page). There has been no previously reported remediation nor has the SNEC facility performed any radiological clean-up activities in this area. This area was designated a Class 2 area.
7
Final Status Survey - PENELEC Switch Yard 3.2 PENELEC Switch Yard The Switch Yard area was built at about the same time as the coal fired Saxton Steam Generating Station (SSGS), and has been physically modified since the time when it supported the operation of the SSGS facility. It is currently used to regulate and supply electricity to customers in western Bedford County and part of Huntington County.
3.2.1 PENELEC Switch Yard Remediation Status Remediation of the Class 1 open land area of the Switch Yard (survey unit PS4-1), was performed in about 1994 (Reference 9.5). Elevated activity concentrations were identified and were shown to extend within and along the drainage ditch that includes the exit pipe located in grid BD-129. Contaminated soils and soil like materials east of site grid marker No. 131 were collected and removed from the area and shipped as radioactive waste. Cs-137 activity levels were originally identified in this area up to about 9 pCi/g before remediation. This contamination was successfully lowered to a mean concentration of about 3 pCi/g (Reference 9.5). During FSS work in and near this vicinity, one elevated area was identified near the south fence line in site grid BA-1 30, which was most probably an area missed during the initial remediation effort. No other remediation work has been performed in the Switch Yard area.
3.3 SNEC Facility Plant Operations The Saxton Nuclear Experimental Corporation (SNEC) facility included a pressurized water reactor (PWR), which was licensed to operate at 23.5 megawatts thermal (23.5 MWth). The reactor, containment vessel and support buildings have all been removed from the site. The facility is owned by the Saxton Nuclear Experimental Corporation and is licensed by GPU Nuclear, Inc. The SNEC facility is maintained under a Title 10 Part 50 license and associated Technical Specifications. In 1972, the license was amended to possess but not operate the SNEC reactor.
The facility was build from 1960 to 1962 and operated from 1962 to 1972 primarily as a research and training reactor. After shutdown in 1972, the facility was placed in a condition equivalent to the current SAFSTOR status. Since then, it has been maintained in a monitored condition. The fuel was removed in 1972 and shipped to a (now DOE) facility at Savannah River, South Carolina, who is now the owner of the fuel. As a result of this, neither SNEC nor GPU Nuclear, Inc. has any further responsibility for the spent fuel from 8
Final Status Survey - PENELEC Switch Yard the SNEC facility. The building and structures that supported reactor operation were partially decontaminated by 1974.
In the late 1980's and through the 1990's, additional decontamination and disassembly of the containment vessel, support buildings and large and small component and equipment removal was completed. Final decontamination and dismantlement of the reactor support structures and buildings was finished by 1992. Large component structures, pressurizer, steam generator, and reactor vessel were removed in late 1998. Containment vessel removal (to below grade) and backfill was completed in late 2003. Currently, decontamination, disassembly and demolition of.the SNEC facility buildings and equipment has been completed and the facility is in the process of performing the Final Status Survey for unrestricted release and license termination.
4.0 Site Release Criteria The site release criteria as applied to the PENELEC Switch Yard area including OL12-1, corresponds to the radiological dose criteria for unrestricted use per 10 CFR 20.1402. The dose criteria is met "if the residual radioactivity that is distinguishable from background radiation results in a Total Effective Dose Equivalent (TEDE) to an average member of the critical group that does not exceed 25 mrem/yr, including that from groundwater sources of drinking water, and that the residual radioactivity has been reduced to levels that are as low as reasonably achievable (ALARA)."
Levels of residual radioactivity that correspond to the allowable dose to meet the site or survey unit release criteria were derived by analyses using either the building occupancy (surface area) or resident farmer (volumetric) scenarios. The dose modeling for these scenarios is explained in Chapter 6 of the SNEC LTP (Reference 9.1). The derived concentration guideline levels (DCGLs) determined in the LTP form the basis for satisfying the site release criteria.
As described in Chapter 6 of the SNEC LTP (Reference 9.1), a correction to the gross activity DCGLw is made to address de-listed radionuclides and provide a reasonable SNEC established safety factor. The SNEC facility has instituted an administrative limit of 75% for the allowable dose (DCGLw) for all measurement results. Thus the de-listed radionuclide dose is accounted for by using the 75% administrative limit.
9
Final Status Survey - PENELEC Switch Yard 4.1 OL12-1 Area Specific DCGLw Values The OL12-1 open land area borders the PENELEC Switch Yard on the northern, western and southern sides (see Figure 2). It also borders OL11 and is thought to have a higher probability of being impacted from work activities in OL11 than from physical work performed in the Switch Yard area. This is an application of conservative logic in that the DCGLw values used for the OL1 1 area are somewhat lower than those selected for the PENELEC Switch Yard area. The derivation of these DCGLw values is provided in Appendix A-1, Attachment 2-1 to 2-3. The OL12-1 DCGLw values are provided in Table 1 below.
Table 1, OL12-1 OPEN LAND AREA DCGLw VALUES
- Volumetric DCGLw (pCVg) for Cs-137 3.22 (2.41 A.L.) (mix is 40 % Cs-137)
NOTE: A.L. is the site Administrative Limit or 75% of the effective DCGLw for the area.
4.2 PENELEC Switch Yard DCGLw Values The PENELEC Switch Yard is adjacent to site areas OL1 and 0L2 on the east. As marked on the larger SNEC site grid map, it is contained within the OL1, 0L2 and OL12 areas (Reference 9.4). However, the Switch Yard area has since been re-designated by two basic survey units (PS4-1 and PS4-2) according to their impacted area classification (Reference 9.1, Table 5-5). PS4-1 is a Class 1 open land area of approximately 1,612 M2, and PS4-2 is a Class 2 open land area of less than 3,600 M2.
Because remediation efforts in the Class 1 area of the Switch Yard (PS4-1) are thought to result from contamination spread from the OL1 and OL2 areas, a sample listing from OL1/0L2 is used to represent the PENELEC Switch Yard area as well. Sample results from the OL1 and OL2 areas have been pooled. The resulting DCGLw values are provided below in Table 2 (from Appendix B-1, Attachment 2-1 to 2-8). Since there are structural surfaces in the Switch Yard as well as open land area, a gross activity DCGLw value is also listed.
Table 2, PENELEC SWITCH YARD DCGLw VALUES l Gross Activity DCGLw (dpm/100 cm2)
Volumetric DCGLw (pCilg) for Cs-137 l 44,317 (33,238 A.L.) (mix is 60 % Cs-137) 5.75 (4.31 A.L.)
10
Final Status Survey - PENELEC Switch Yard 5.0 Final Status Survey Design/DQO Process The Data Quality Objectives (DQO) process is a series of planning steps based on the scientific method for establishing criteria for data quality and developing survey designs.
The level of effort associated with planning is based on the complexity of the survey.
Large, complicated sites generally receive a significant amount of effort during the planning phase, while smaller sites may not require as much planning effort. Planning radiological surveys using the DQO Process can improve the survey effectiveness and efficiency, and thereby the defensibility of decisions. The use of the DQO Process assures that the type, quantity, and quality of environmental data used in decision making will be appropriate for the intended application. It provides systematic procedures for defining the criteria that the survey design should satisfy, including when and where to perform measurements, the level of decision errors for the survey, and how many measurements to perform.
SNEC facility Survey Designs (SD's) (Appendix A-1, B-1 and C-1) were developed in accordance with applicable sections of the SNEC License Termination Plan (LTP)
(Reference 9.1), and applicable site procedures (e.g.,
Reference 9.6). During development, characterization activities were reviewed along with any post-remediation survey or sampling activities (as applicable). Survey unit variability was established from the best available or most representative measurement and/or sampling data. The Compass computer program (Reference 9.7) was then used to develop MDCscan parameters (for structural surfaces), the number of survey or sampling points in each survey unit, and other DQO design parameters. For open land areas, methodology from NUREG-1507 (Reference 9.8) was used to calculate MDCscan values that are then input to the Compass computer program. For structural surfaces, representative background values were extracted from previous measurements of non-impacted like-materials of similar age whenever possible. For open land areas, background concentrations of relevant SNEC radionuclides are not subtracted from sample data sets prior to developing individual survey unit surrogate levels (of Cs-137). Thus the effective DCGLw values for these areas is conservatively biased.
The following tables provide the DQO parameters used in the survey designs for the OL12-1 and PENNELEC Switch Yard open land area.
11
Final Status Survey - PENELEC Switch Yard Table 3, DQO/Design Parameters/Results - Open Land Area 1"ufre Unit' I PS4 -
I-
_nn no ---
Survey Design Calculation. No.
tYUU-U5-U0l tWUU-U3-UU*
tYUU-U5-UU3 SNEC Survey Request No.
SR-211 SR-193 SR-194 Survey Area Classification Class 2 Class 1 Class 2 Total Area Size (M2) 1,152 1,612
- 3,600 Scanning Goal (M2) 576 (-50%)
1,612 (100%)
-3,600 (100%)
Actual Area Scanned (M2) 634 (55%)
1,548 (96%)
2742 (86%)
Applicable Statistical Test Sign Sign Sign Type I Decision Error (ca) 0.05 0.05 0.05 Type II Decision Error (p) 0.10 0.10 0.10 Soil DCGLw (Cs-137 pCi/g)*
3.22 (2.41 A.L.)
5.75 (4.31 A.L.)
5.75 (4.31 AL.)
LBGR (Cs-137 pCi/g) 1.7 3.5 3.6 Estimated car (Cs-137 pCi/g) 0.468 0.47 0.47 Actual a in Survey Unit (Cs-137 pCi/g) 0.27 0.44 0.47 A/a 1.52 1.72 1.51 Samples Required by Compass 14 16 14 Samples Specified by VSP**
17 19 20 Estimated Scan MDC (pCi/g) 5.97 3.2 3.2 Scan Speed (cm/sec) 25 25 25 Survey Instrument Type***
L-2350-1, w144-10 Probe (2" by 2" Nal)
Instrument Conversion (cpm/mR/h) 2 206,000 2 209,000 209,000 Nal Scan Alarm Point (cpm)
> 350
> 300
> 300 Detector Gap to Surface (inches) 4" 4"
4" A.L. is the SNEC Facility Administrative Limit (75% of applicable DCGLw).
VSP is Visual sample Plan. VSP is used to plot points on diagrams. Typically several additional points are added during this process to compensate for losses in the field.
Uses a narrow window detector setting that improves the signal to noise ratio for Cs-1 37.
The data provided in Tables 3 and 4 were collected from the appendices and actual survey results. Some of the values shown in these tables are consistently applied from survey unit to survey unit across the entire site. For instance, the Nal detector gap to surface distance for scanning is always set at four (4) inches over soil and soil-like materials. With few exceptions, scanning speed over soil and soil-like materials is set at 25 centimeter per second. Additionally, the type I (a) and 11 (p) decision errors are always set to 0.05 and 0.1 respectively for every survey design.
Table 4 provides the DQO parameters for structural areas within the PENELEC Switch Yard.
12
Final Status Survey - PENELEC Switch Yard Table 4, DQOIDesign Parameters/Results - Structures v
=CA--
N-o Survey Design Calculation. No, I _ L~P 3b..1
-I:____PS3_2 E900-05-002 E900-05-003 E900-05-002 SNEC Survey Request No.
SR-193 SR-194 SR-193 Survey Area Classification Class 3 Class 3 Class 1 Total Area Available for Survey Work (M2)
- 187
- 414 4.2 Scanning Goal (M2) 187 (100%)
414 (100%)
4.2 (100%)
Actual Area Scanned (M2) 148 (79%)
362 (87%)
4.2 Applicable Statistical Test WRS WRS WRS Type I Decision Error (a) 0.05 0.05 0.05 Type II Decision Error (0.10 0.10 0.10 Gross Activity DCGLw (dpm/0 c 2 *44,317'(33,238 A.L.)
Gross Activity DCGLw (cpm) 1,675 (A.L.)
LBGR (cpm) 1,300 (A.L.)
Estimated a (cpm) 205 Actual a From Survey Unit (cpm) 74 151 66 A/a 1.83 1.83 1.83 Static Measurements Required by Compass 11 11 11 Static Measurements Specified byVSP**
15 15 15 Estimated Scan MDC (dpm/100 cm2) 3,306 3,306 3,487 Scan Speed (cm/sec)
-2
-2
-2 Survey Instrument Type L-2350-1, w/43-68 GFPC Probe Instrument counts/disintegration (c/d) 0.041 GFPC Scanning Alarm Point (gcpm) 1,000 1,000 1,400 Detector Gap to Surface (inches)
Contact Contact Contact Detector c/d Correction for Rough Surface 0.285 A.L. is the SNEC Facility Administrative Limit (75% of the applicable DCGLw).
VSP is Visual sample Plan. VSP is used to plot points on diagrams. Typically several additional points are added during this process to compensate for losses in the field.
5.1 Survey Design for the OL12-1 Open Land Area OL12-1 is a Class 2 open land area of approximately 1,152 M2. The survey design for OL12-1 is provided as Appendix A-1. The initial scanning goal for this area was set at
-600 m2 (-52%). A review of the radiological survey data shows that approximately 634 m2 were actually scanned, or about 55% of the OL12-1 survey unit. Grid areas were randomly chosen from those available (see Appendix A-1, Attachment 5-1). The alarm point (AP) for this survey unit was set at 350 gross counts per minute (gcpm), which approximately equals a scan MDC of 5.97 pCi/g for Cs-137 (see Appendix A-1, -1 to 4-3).
13
Final Status Survey - PENELEC Switch Yard The number of random start, triangular grid, systematically spaced sample points were determined using the COMPASS computer program (Appendix A-1, Attachment 6-8 to 6-10). The minimum number of sample points selected by Compass was fourteen (14).
Each sample was to be one meter in depth to match the site area dose model discussed in Chapter 6 of the SNEC LTP (Reference 9.1). However, survey team personnel found that the Switch Yard grounding mat extended into the OL12-1 survey unit from the Switch Yard area. Sampling depth was then adjusted to less than the depth of the grounding mat, which was in most cases a surface sample of six (6) inches in depth. No significant amount of cover materials such as crushed stone, were encountered and this adjusted sample depth is considered reasonably representative of the area.
All sample points were placed on survey maps of the OL12-1 area using the Visual Sample Plan (VSP) computer code (Reference 9.9). Additional samples are added during this step to compensate for possible field losses. As a result, seventeen (17) samples were actually located and taken for the OL12-1 survey unit (Appendix A-1, Attachment 7-1). The actual variability of the FSS randomly placed sample data set was less than the planning value. See Table 3.
5.2 Survey Design for the PS4-1 and PS4-2 Open Land Areas PS4-1 is a Class 1 open land area of about 1,612 M2. Because this is a Class 1 area, the initial scanning goal was set 100% of the available open land area. The area estimate includes the footprint of some concrete structures in the substation, and is somewhat greater than the available open land area. A review of the radiological survey data shows that approximately 1,573 m2 were actually scanned or about 98% of the area estimated for the PS4-1 survey unit. This is a hazardous area with stringent survey limitations regarding the approach distance to substation power handling equipment. The survey design for PS4-1 is provided as Appendix B-1.
The alarm point (AP) for this survey unit was set at > 300 gross counts per minute (gcpm),
which approximately equals a scan MDC of 3.2 pCi/g for Cs-137 (Appendix B-1, -1 to 4-3).
The number of random start, triangular grid, systematically spaced sample points were determined using the COMPASS computer program (see Appendix B-1, Attachment 5-1 to 5-4). The minimum number of sample points selected by Compass was sixteen (16). As 14
Final Status Survey - PENELEC Switch Yard previously discussed, the Switch Yard area contains a grounding mat at a depth of about sixteen (16) inches (more or less). In addition, a layer of crushed stone has been added to improve walkways around substation power handling equipment. To accommodate this unique situation, two (2) samples were collected at each location where a stone layer was present. The first sample was of the overburden materials, in this case the crushed stone layer. The second sample was taken below the stone layer but above the grounding mat.
In all cases, the depth of the second sample was less than the depth of the grounding mat.
All sample points were placed on survey maps of the PS4-1 area using the Visual Sample Plan (VSP) computer code (Reference 9.9). Additional samples are added during this step to compensate for possible field losses. As a result, nineteen (19) samples were actually located and taken in this survey unit (Appendix B-1, Attachment 6-1). The actual variability of the randomly placed sample data set was less than the planning value. See Table 3.
PS4-2 is a Class 2 open land area of less than 3,600 M2. Just as in PS4-1, the area estimate includes the footprint of some concrete structures in the substation and therefore is somewhat greater than the available open land area. This is a hazardous area and the approach distance to some equipment is the limiting factor for survey planning purposes.
Therefore, the initial scanning goal for this area was set 100% of the available open land area in the hopes that a significant portion of the area could be accessed (at least 50%). A review of the radiological survey data shows that approximately 3,093 m2 were actually scanned or about 86% of the PS4-2 survey unit, which is more than adequate. The survey design for PS4-2 is provided as Appendix C-1.
The alarm point (AP) for this survey unit was set at > 300 gross counts per minute (gcpm),
which approximately equals a scan MDC of 3.2 pCi/g for Cs-137 (from Appendix B-1, -1 to 4-3).
The number of random start, triangular grid, systematically spaced sample points were determined using the COMPASS computer program (see Appendix C-1, Attachment 4-1 to 4-3). The minimum number of sample points selected by Compass was fourteen (14).
As previously discussed, the Switch Yard area contains a grounding mat at a depth of about sixteen (16) inches (more or less). In addition, a layer of crushed stone has been added to improve the walk areas around the substation power handling equipment. To 15
Final Status Survey - PENELEC Switch Yard accommodate this situation, two (2) samples were collected at each location where a stone layer was present. The first sample was of the overburden materials, in this case the crushed stone layer. The second sample was taken below the stone layer but above the grounding mat. In all cases, the depth of the second sample was less than the depth of the grounding mat.
All sample points were placed on survey maps of the PS4-2 area using the Visual Sample Plan (VSP) computer code (Reference 9.9). Additional samples are added during this step to compensate for possible field losses. As a result, twenty (20) samples were actually located and taken in this survey unit (Appendix C-1, Attachment 1-5). The variability of the randomly placed sample data set was the same as the planning value when all randomly placed samples are considered. See Table 3.
5.3 Survey Design for the PS3-2 Class I Structural Material PS3-2 is a Class 1 structural material of approximately 4.2 m2 (see Appendix B-1, -3, 1-5 and 1-6. The initial scanning goal for this area was set at -4.2 m2 (100%). A review of the radiological survey data shows that 4.2 m2 were actually scanned.
The alarm point (AP) for the scan of this survey unit was set at 1,400 gross counts per minute (gcpm). The DCGLw in terms of a gross activity count per minute is 1,675 cpm.
See Table 4 for all DQO/Design parameters.
The number of random start, triangular grid, systematically spaced static measurement points were determined using the COMPASS computer program (Appendix B-1, 3-1 to 13-4). The minimum number of static points was determined to be eleven (11). The VSP computer program was used to plot survey points on the survey map, and a few additional points are added at this time to compensate for possible field losses. VSP placed fifteen (15) points on the survey map (Appendix B-1, Attachment 7-1). Each static measurement was a one (1) minute count at each location marked on the survey map.
5.4 Survey Design for the PS3a-1 and PS3b-1 Class 3 Structural Material PS3a-1 is a Class 3 structural material of approximately 187 m2 (see Appendix B-1, -4, and 1-7 through 1-21). The initial scanning goal for this area was set at 100% of the listed surface area (187 M2) since this was not all of the surface area in the PS3a-1 area. There is no requirement to survey 100% of the surface area in a Class 3 16
Final Status Survey - PENELEC Switch Yard survey unit. A review of the radiological survey data shows that approximately 148 m2 were actually scanned (79%). The alarm point (AP) for the scan of this survey unit was set at 1,000 gross counts per minute (gcpm). The DCGLw in terms of a gross activity count per minute is 1,675 cpm. See Table 4 for all DQO/Design parameters.
The number of random start, triangular grid, systematically spaced static measurement points were determined using the COMPASS computer program (Appendix B-1, 4-1 to 14-3). The minimum number of static points was determined to be eleven (11). The VSP computer program was used to plot survey points on the survey map, and a few additional points are added at this time to compensate for possible field losses. VSP placed fifteen (15) points on the survey map (Appendix B-1, Attachment 7-2). Each static measurement was a one (1) minute count at each location marked on the survey map.
PS3b-1 is a Class 3 structural material of approximately 414 m2 (see Appendix C-1, -2, and 1-4. The initial scanning goal for this area was set at 100% of the listed surface area (414 M2), which is the horizontal surface area of the regions shown in -2 of Appendix C-1. However, there is no requirement to survey 100% of the surface area in a Class 3 survey unit (Reference 9.1, Table 5-5). A review of the radiological survey data shows that approximately 362 m2 were actually scanned (87%).
The alarm point (AP) for the scan of this survey unit was set at 1,000 gross counts per minute (gcpm). The DCGLw in terms of a gross activity count per minute is 1,675 cpm.
See Table 4 for all DQO/Design parameters.
The number of random start, triangular grid, systematically spaced static measurement points were determined using the COMPASS computer program (Appendix C-1, -1 to 5-2). The minimum number of static points was determined to be eleven (11). The VSP computer program was used to plot survey points on the survey map, and a few additional points are added at this time to compensate for possible field losses. VSP placed fifteen (15) points on the survey map (Appendix C-1, Attachment 1-4). Each static measurement was a one (1) minute count at each location marked on the survey map.
17
Final Status Survey - PENELEC Switch Yard 6.0 Final Status Survey Results 6.1 Summary of Survey Results for OL12-1 Open Land Area From Appendix A-2, approximately 55% of the total OL12-1 area was scanned during FSS activities. The scanning effort exceeded the requirements of the survey design (Appendix A-1), and met the requirements for a Class 2 open land area which is expected to be between 10 to 100% (Reference 9.1, Table 5-5). Therefore, the total area scanned in OL12-1 is considered adequate. Instrument response above 350 gcpm was used as the alarm point during the FSS scanning effort. Using this alarm point, no instrument alarms were encountered in this survey unit. Worth noting is that during characterization activities in this same area, the alarm point was set at 300 gross counts per minute (gcpm), which is at or near background levels. This resulted in a number of samples being taken based on exceeding an alarm point driven solely by background values. As expected, sample results from these alarm points were all below the applicable DCGLw, and alarms were attributed to elevated concentrations of naturally occurring radionuclides (see Appendix A-1, Attachment 8-1). Sample results from the Final Status Survey in OL12-1 are shown in Table 5.
Table 5. OL12 SR-211 SamDle Results I
I, I
I, Sample No;l Grid No. Sample Point Cs-137 (pCg) Sample Depth SXSL10167 BG-137 SP-4
<0.12
<16" SXSL10168 BG-136 SP-5 0.65
<16" SXSL10169 BG-136 SP-6 0.32
<16" SXSL10170 BG-135 SP-7 0.65
<16" SXSL10171 BG-134 SP-8 c 0.18-
<16" SXSL10172 BG-133 SP-9 0.18
<16" SXSL10173 BG-132 SP-10 0.13
<16" SXSL10174 BG-137 SP-11 0.50
<16" 1ISXSL10175 BG-137 SP-11 QC 1 0.51
<16" SXSL10176 I BG-1361 SP-12 1
1.06 I
<16"
81
2.A BG-135 SP-13 0.67
< 16" BG-134 SP-14 0.27
< 16" BG-133 SP-15 0.21
< 16" BG-132 SP-16 0.32
< 16" BG-132 SP-17 0.79
< 16" AY-137 SP-1 0.27
< 16" AY-136 SP-2 0.16
< 16" SP-2 QC I 0.13 SP-3 k'O.16 Average=,i 0.38
< 16" Sigrna=:
0.27 Maximumrn 1.06 Note: Shaded result is a Less Than' value.
18
Final Status Survey - PENELEC Switch Yard The variability of the samples identified in Table 5 are below the initial variability estimate used during the survey-planning phase (see Table 2 initial sigma value for 0L12-1).
6.2 Summary of Survey Results for PS4-1 Open Land Area From Appendix B-2, approximately 98% of the total PS4-1 area was scanned during FSS activities. The scanning effort met the requirements of the survey design (Appendix B-1),
and the requirements for a Class 1 open land area which is to have 100% of the available area scanned (Reference 9.1, Table 5-5). Therefore, the total area scanned in PS4-1 is considered adequate. Instrument response above 300 gcpm was used as the alarm point during the FSS scanning effort. Using this alarm point, instrument alarms were encountered and investigated, which resulted in a number of samples being taken based on exceeding the alarm set-point (see Appendix B-2). Sample results from the random start systematically spaced triangular grid system are reported in Table 6 and the results of the alarm point investigation are reported in Table 7.
.1. AR1A2 Wamnla Rescults I
Sample Polnt Cs-37 (pCUg)
Sample Depth SP-1-1
< 0.05 6"
SP-1-2 1.22
< 16' SP-2-1
<0.07 -
6" SP-2-2 1.10
< 16' SP-3-1
<0.05 6'
SP-3-2 0.96
< 16" SP4 1.23
< 16" SP-5-1
< 0.06 6'
SP-5-2 0.81
< 16" SP-6-1
< 0.05 6'
SP-6-2 0.86
< 16' SP-7 0.83
< 16" SP-8-1
< 0.06.
6" SP-8-2 0.84
< 16' SP-9-1
< 0.06 6"
SP-9-2 0.48
< 16" SP-10 0.73
< 16" SP-11-1
< 0.05 6'
SP-11-2 0.83
< 16' SP-12 0.91
< 16' SP-13 0.56
< 16" SP-14-1
< 0.05 6"
SP-14-2 0.32
< 16' SP-15 0.83
< 16' SP-16 0.53
< 16' SP-17 0.99
< 16' SP-18 0.71
< 16' SP-19 0.93
< 16' SP4 QC 1.58
< 16" sP-1s ac 0.83
< 16' Avea=7 0.62 l
Sigma=*l 0.44 Maximum=21 1.S8 Note: Gray shaded result are "Less Than' values. SXSO sample numbers are from upper stone layer.
19
Final Status Survey - PENELEC Switch Yard Random start systematically spaced sample results are reported in Table 6 (see Appendix B-2). The variability of FSS randomly spaced samples is less than the value used for survey planning purposes (see sigma values in Table 3).
Table 7, PS4-1 Alarm Point Investigation Results LSample No. Grid No.l Sample Point ICs-137 (pCUgth S I I Sa mplPoint Nal gcpm Area SXSLI0277 BA-130 AP-2 11.09
< 16-SXSL10293 BA-130 SP-1 4.48
< 16' SXSL10294 BA-130 SP-2 246
< 16' 3XSL9936 BA-130 AP-1 11.31
< 16-BA-130 AP-3 SP-1 0.78
< 16' SP-2 2.81
< 16' SP-3A 0.12 6-SP-33 1.14
< 16' SP-4A
< 0.05 6-SP-4B 0.73
< 16' SP-5A 0.14 6-SP-5B 1.12
< 16" Averagen 2.62 Sigma3 3.57 MaximumZ 11.31 AP-2 453& 525 0.9 mA2. 1.5 mA2 SP-1 SP-2 AP-1 366 0.9 mA2. 1.5 mA2 AP-3 358 1.5 m;2 SP-1 157 9.4 mr2 SP-2 233 SP-2 QC SP-3A 149 SP-3B SP-4A 132 _
SP-4B SP5A 173 SP-5B Note: Shaded result is a 'Less Than" value.
From Table 7 Nal gcpm scanning result, an elevated area in grid BA-130 was defined for survey unit PS4-1 to be about 1.5 m2 in total area (maximum size reported). Sample results at instrument alarm point locations yielded a high concentration of 11.31 pCi/g for Cs-137. These initial results are shown in the first four listings provided in Table 7. A larger -9.4 m2 (-2 meter radius) area around the inner 1.5 m2 elevated area was also surveyed and sampled to help define the extent of the actual boundary of the elevated area. The second group of sample numbers in Table 7 (sample No's. 10361 to 10369) are from the larger surrounding area. This second group of samples were all below the applicable DCGLw value of 4.3 pCi/g Cs-137. Therefore, the inner 1.5 m2 is a reasonable estimate of the area for this location.
The following EMC calculation was performed using these assumptions:
The mean of the randomly selected points from Table 6 is 0.62 pCi/g Cs-137
- The maximum concentration found in the 1.5 m2 elevated area is assumed to be the mean for the elevated area (11.31 pCi/g Cs-137)
- The DCGLw administrative limit (4.3 pCi/g) is the applicable limit for a 10,000 m2 area.
- The area factor (AF) for Cs-137 in a 1,613 m2 area is 2.6 and the AF for the 1.5 m2 area is 28.2 (interpolation of data from Table 5-15 of Reference 9.1).
20
Final Status Survey - PENELEC Switch Yard The resulting calculation is performed in a spreadsheet and the results are provided in Table 8. Using the most conservative assumptions, the PS4-1 survey unit meets the release criteria.
Table 8, EMC Calculation for PS4-1 Area (1,614 M2)
Site Report Analysis Based on MARSSIM Equation 8-2 EMC CALCULATOR Survey Unit Mean II Cs-137 ll 0.62 pcug D
DCGLwI 4.3Ipcug l
I Reference Bk nd
[
.28jpCug Remove Bkgnd7 No mA2 EMC Mean 0.62 pcIg MeanAFl 2.61 16131 PASS EM-1 11.31 pCI1g AF-1 28.21 1.51 PASS EM-2 p
pCUg AF-2 I
PASS EM-3 lPCUg AF-3 I
PASS RATI0 Eqj~uation 8-2. MARSSIM Pii asSS NOTE: Required Input values In RED.
6.3 Summary of Survey Results for PS4-2 Open Land Area From Appendix C-2, approximately 86% of the total PS4-2 area was scanned during FSS activities. The scanning effort exceeded the requirements of the survey design (Appendix C-1), and met the requirements for a Class 2 open land area which is expected to be between 10 and 100% of the available area (Reference 9.1, Table 5-5). Therefore, the total area scanned in PS4-2 is considered adequate. Instrument response above 300 gcpm were used as the alarm point during the FSS scanning effort. Using this alarm point, instrument alarms were encountered and investigated, which resulted in a number of samples being taken (see Appendix C-2). Sample results from the random start systematically spaced triangular grid system are reported in Table 9 and the results of the alarm point investigation are reported in Table 10.
21 C!t
Final Status Survey - PENELEC Switch Yard Table 9, PS4 SR-194 Sample Results I
I I
I I
I I
I I
l Sample No.
Grid No.
Sample Point Cs-137 (pCilg)
Sample Depth ISXOT9942 AZ-37 SP-1-1 0.10 1
-6" 2SXSL9943 AZ-137 SP-1-2
- 0.20
< 16" 3SXOT9944 BA-136 SP-2-1
.<C0.08
-6" 4SXSL9945 BA-136 SP-2-2
<0.21
< 16" SXOT9946:
BA-135 SP-3-1
<0.07
-6" SXSL9947 BA-135 SP-3-2 2.00
< 16" 7SXOT9948 BA-133 SP-4-1
- < 0.09
-6" 8 SXSL9949 BA-133 SP-4-2 0.72
< 16" 9 SXOT9950 BA-1 32 SP-5-1
<0.08
-6" 0 SXSL9951 BA-1 32 SP-5-2 0.80
< 16" 1 SXOT9952 BB-137 SP-6-1
<0.07
-6" 2 SXSL9953 BB-137 SP-6-2 0.47
< 16" 3 SXSL9954 BB-137 SP-6-2 QC 0.24
< 16" 4 SXOT9955 BB-135 SP-7-1
<0.07
-6" SXSL9956 BB-135 SP-7-2
<0.76
< 16" SXOT9957 BB-134 SP-8-1
<0.09
-6" SXSL9958 BB-134 SP-8-2 0.94
< 16" SXOT9959 BB-133 SP-9-1 0.06 -
-6" 9III SXSL9960 BB-133 SP-9-2 0.39
< 16" SP-10-1
<0.11
-6" SP-10-2 0.23
< 16" SP-11-1
<0.13-
-6" SP-11-2 0.80
< 16" SP-12-1
<0.03
-6" SP-12-2 1.52
< 16" SP-13-1
<.0.05
-6" SP-13-2 1.31
< 16" SP-13-20C 0.97
< 16" SP-14 0.70
< 16" SP-15 C0.30
<16" SP-16 0.25
< 16" 0.37
< 16" 0.84
< 16" 0.42
< 16" 0.39 0.45 0.47 2.00 Note: Gray shaded result are 'Less Than' values. SXSO sample numbers are from upper stone layer.
Sample results from the random start systematically spaced triangular grid system shown in Table 9, were all less than the applicable DCGLw value. The variability of this group of samples that includes QC results and samples of the upper crushed stone layer, is the same as the value used in survey planning process. See Table 3.
Table 10 provides the investigation results for the alarm points found in this survey unit within grid numbers BE-135, BF-137, BD-136, and BE-137. None of these or any of the random start systematic sample results were above the applicable DCGLw.
22
Final Status Survey - PENELEC Switch Yard I
Table 10. PS4-2 Alarm Point Investigation Results Sample No. Grid No. Sample Point Cs.137 (pCUg)l Sample Depth
'Sample Point Nal gcpm Area.
SXSL10278 BE-135 AP-1
< 0.21
< 16' 301 & 334 0.09 mA2 SXSL10279 BF-137 AP-1 0.34
< 16' i
301 1 mA2 SXSL10280 BF-137 AP-2 0.71
< 16' 316 1 mA2 SXOT10281 BD-136 AP-1
< 0.09
--6" 340 0.1 mA2 SXOT10282 BD-136 SP-1
< 0.09 SXSLI0283 BE-137 AP-6 1.22
< 16' AP-1 305 20 mA2 SXSL10284 BE-137 SP-1 1.83
< 16' AP-2 306 SXSL1 0285 BE-137 SP-2 1.04
< 16' AP-3 303 SXSL10286 BE-137 SP-3 1.22
< 16' AP-4 359 AP-5 325 I
AP-6 302 I
AP-7 353 I
< 16' SXSL10021 BE-137 AP-7 3.10
< 16' SXSL10022 BE-137 AP-7 QC 2.47
< 16' SXSL10023 BE-137 AP4 1.37
< 16' 325 [ -
-4
+
i Average=*
0.96 Sigmla=*
0.83 Maximum=*
3.1 0 Note: Gray shaded results are 'Less Than' values. SXSO sample numbers are from upper stone layer. These AP's are from grids BE-135, BF-137, BD-136 and BE-137. While not every AP within each elevated area was sampled, enough samples were taken within an area/grid to verify that the area/grid was below the DCGLw. No further action was indicated.
6.4 Summary of Survey Results for PS3-2 Structural Surfaces From Appendix B-2, 100% of the PS3-2 survey unit was scanned during FSS activities.
The scanning effort met the requirements for a Class 1 structural surface in accordance with Reference 9.1, Table 5-5. Gas Flow Proportional Counter (GFPC) instrument response above 1,400 gcpm were used as the alarm point during the FSS scanning effort.
No instrument alarms were encountered, and all scan measurements were below the alarm point as well as the applicable DCGLw (in cpm). Sample results from the random start systematically spaced triangular grid system are reported in Table 11.
The variability of the random start systematically placed samples is less than the variability used to plan the survey work. See Appendix B-1, Attachment 13-2. No further action or statistical testing is necessary since no measurement exceeds the applicable DCGLw (in cpm).
23
Final Status Survey - PENELEC Switch Yard 2
3 4
S 6
7 a
9 la 1 1 12 13 14 15 Table 11. PS3 SR-193 Sample Results Location No.
OWgcpm PS3-2-FP1 498 PS3-2-FP2 380 PS3-2-FP3 388 PS3-2-FP4 428 PS3-2-FP5 345 PS3-2-FP6 358 PS3-2-FP7 370 PS3-2-FP8 351 PS3-2-FP9 335 PS3-2-FP10 513 PS3-2-FP1 1 456 PS3-2-FP12 475 PS3-2-FP13 493 PS3-2-FP14 507 PS3-2-FP15 367 Average=l 418 Sigma=
66 Maximum=
513 Note:OWistheGFPCopen window result.
6.5 Summary of Survey Results for PS3a-1 Structural Surfaces From Appendix B-2, 79% of the available area estimated for PS3a-1 was scanned during FSS activities. The scanning effort met the requirements for a Class 3 structural surface in accordance with Reference 9.1, Table 5-5. Gas Flow Proportional Counter (GFPC) instrument response above 1,000 gcpm were used as the alarm point during the FSS scanning effort. No instrument alarms were encountered, and all scan measurements were below the alarm point as well as the applicable DCGLw (in cpm). Sample results from the random start systematically spaced triangular grid system are reported in Table 12.
The variability of the random start systematically placed samples is less than the variability used to plan the survey work. See Appendix B-1, Attachment 14-1. No further action or statistical testing is necessary since no measurement exceeds the applicable DCGLw (in cpm).
24
Final Status Survey - PENELEC Switch Yard Table 12, PS3a SR-193 Sample Results L Location No. :gOWcpm I PS3a1-FP1 596 2 PS3a1-FP2 451 3 PS3a1-FP3 464 4 PS3a1-FP4 432 5 PS3a1-FP5 445 6 PS3a1-FP6 412 7 PS3al-FP7 397 8 PS3a1-FP8 576 9 PS3a1-FP9 503 10 PS3a1-FP1O 449 11 PS3a1-FP11 307 12 PS3a1-FP12 560 13 PS3a1-FP13 458 14 PS3a1-FP14 417 15 PS3a1-FP15 489 Average 464 Sigma 74 Maximum 596 Note: OW is the GFPC open window result.
6.6 Summary of Survey Results for PS3b-1 Structural Surfaces From Appendix C-2, 87% of the available area estimated for PS3b-1 was scanned during FSS activities. The scanning effort met the requirements for a Class 3 structural surface in accordance with Reference 9.1, Table 5-5. Gas Flow Proportional Counter (GFPC) instrument response above 1,000 gcpm were used as the alarm point during the FSS scanning effort. Sample results from the random start systematically spaced triangular grid system are reported in Table 13. Instrument alarms during the scanning process have been reported in Table 14. However, all scan measurements were below the applicable DCGLw (in cpm).
The variability of the random start systematically placed samples is less than the variability used to plan the survey work. See Appendix C-1, Attachment 5-1. No further action or statistical testing is necessary since no measurement exceeds the applicable DCGLw (in cpm).
25
Final Status Survey - PENELEC Switch Yard 1
2 3
A I
.7 S
I C I11 12 13 14 Table 13, PS3b.1 - SR-194 Sample Results Location No.
OW-9cpmn PS3b1-FP1 408 PS3b1-FP2 360 PS3b1-FP3 532 PS3b1-FP4 394 PS3b1-FP5 466 PS3b1-FP6 394 PS3b1-FP7 430 PS3b1-FP8 544 3 PS3b1-FP9 569 PS3b1-FP10 366 PS3b1-FP11 378 PS3b1-FP12 347 PS3b1-FP13 667 PS3b1-FP14 824 PS3b1-FP15 754 Averagerl 496 SIgmanl 151 Maximum=*
824 Note: OW is the GFPC open window result.
Four (4) elevated measurement areas (EMA's) reported during the scanning process, were identified by an assigned name. The four (4) EMA areas are shown in Table 14. The maximum count rate for any location was 1,186 cpm. Most of the elevated measurement results are at or near 1,000 cpm and are probably the result of natural background interference. An alternate possibility is that some form of electrical field generated in the substation may have given rise to spurious count rates in the GFPC survey instrument. In order to verify that the count rate from these elevated areas was not derived from surface concentrations of Cs-137, survey team members were asked to sample the elevated survey points in the sensitive area of the GFPC probe (100 cm2 area). Samples were taken within the probe area to a depth of about 1 cm. The collected concrete materials were then gamma scanned to determine the Cs-137 concentration in pCi/g.
Consequentially, no sample contained enough Cs-137 to yield a surface concentration above the DCGLw. A necessary assumption is that all assayed results are a surface concentration. The calculated values are shown in Table 15 and clearly show that residual Cs-1 37 activity is not the cause of the elevated measurement results.
26
Final Status Survey - PENELEC Switch Yard Table 14, Elevated measurement Areas PS3b-1 -SR-194 EMA#1, Sample Results
- Location No. '
OWgcpm
-j I PS3b1-AP1 1028 PS3b1-AP2 1053 PS3b1-AP7 1004 Average=
1028 Sigma=*
25 Maximum*
1053 PS3b SR-194 EMA #2, Sample Results Location No. -
OW-qdpm I PS3b1-AP3 1030 2PS3b1-AP4 1122 1PS3b1l-AP5 1089 PS3b1-AP6 1011 Average=>
1063 lSigma=*
51 aximum:>l 1122 PS3b SR-194 EMA #3, Sample Results Location No.
OWOcpm I PS3b1-AP1 1033 PS3b1-AP2 1052 PS3b1-AP3 1031 4PS3b1-AP4 1008 Average=>
1031 Sigma=l 18 Maximum=*
1052 I1 PS3b SR-194 EMA #4. Sample Results i,
Location No.
-l
- OW.gcpm I PS3b1-AP1 1043 2 PS3b1-AP2 1186 Average=
1115 Sigma=*
101 Maximum=>
1186 Note: OW is the GFPC open window result.
27
Final Status Survey - PENELEC Switch Yard Table 15, PS3b SR-194 Concrete Sample Results Sample No. IGrid No. Sample Po0nt
.Cs137 (pCUg)2 1 SXCF10210 AZ-132 AP-2 R 0.12 2 SXCF10210 AZ-132 AP-2 R0.19 2
3 SXCF10211 AZ-132 AP-4 R 0.12 4 lSXCF10211 AZ-1 32 AP-4
.19 5
SXCF10211 AZ-132 AP-4 I-<0.22 - -_
6 SXCF10214 AZ-133 AP-2
<0.14 -_
SXCF10213 AZ-33 AP-2
-- 0.13 -:
8 SXCF10212 AZ-133 AP-2 0.27 _
(cm)l pC.I dpm/100cmA2 18.71 41.6 1.0 30.3 67.3 1.0 18.5 41.0 1.0 29.8 66.1 1.0 34.2 75.8 0.8 17.9 39.8 0.8 17.2 38.1 1.0 43.0 95.5 7.0 9 SXCF10213 IAZ-1331 AP-2R I
<0.10 131 1181.91 0.8 112.71 28.2
_j I
irage 0.16 Sigma=
0.06 l LMaxmum*
0.27 Note: Gray shaded results are 'Less Than' values.
Data Assessment 7.1 Assessment Criteria Final status survey data has been reviewed to verify authenticity, appropriate documentation, quality, and technical acceptability. The review criteria for data acceptability are:
- 1) The instruments used to collect the data were capable of detecting the radiation of the radionuclide of interest at or below the investigation levels.
- 2) The calibration of the instruments used to collect the data was current and radioactive sources used for calibration were traceable to recognized standards or calibration organizations.
- 3) Instrument response was checked before, and when required, after instrument use each day data was collected.
- 4) Survey team personnel were properly trained in the applicable survey techniques and training was documented.
- 5) MDC values and the assumptions used to develop them were appropriate for the instruments and the survey methods used to collect the data.
- 6) The survey methods used to collect the data were appropriate for the media and types of radiation being measured.
28
Final Status Survey - PENELEC Switch Yard
- 7) Special instrument methods used to collect data were applied as warranted by survey conditions, and were documented in accordance with an approved site Survey Request procedure.
- 8) The custody of samples that were sent for off-site analysis was tracked from the point of collection until final results were provided.
- 9) Final status survey data consists of qualified measurement results representative of current facility status and were collected in accordance with the applicable survey design package.
If a discrepancy existed where one or more criteria were not met, the discrepancy was reviewed and corrective action taken (as appropriate) in accordance with site procedures.
7.2 Survey Variations 7.2.1 Impact of Electrical Hazards The main variation in this survey effort was that some portion of the area (structures or soils) within the Switch Yard could not be accessed because of the serious electrical hazard present in the substation. This was addresses by limiting surveys to areas within the Switch Yard where personnel safety could be optimize. In addition, Class 3 structural areas were surveyed as though they were Class 2 structural areas, since laying out survey points using the random start systematically spaced triangular grid system is actually easier than laying out a series of purely random locations. Thus survey point layout time in the substation area was reduced. It was also recognized that if some structural survey units were really Class 2 and not Class 3 areas, the surveys may have to be re-done.
Treating them as Class 2 areas from the start lessened the possibility of having to return and perform additional surveys in this hazardous area.
7.2.2 Sampling in the Switch Yard Area The sites surface dose model in based on a 1 meter deep layer of soil which requires a one (1) meter deep sample at each sample location. However, the Switch Yard area contains a grounding mat that is present in all three (0L12-1, PS4-1 and PS4-2) open land survey units that is sixteen (16) inches deep (more or less). In addition, some portion of these survey units contain a recently placed crushed stone layer that is several inches deep. These issues required survey team personnel to sample the upper and lower layer of material at each sample point impacted by the addition of a crushed stone topping, and 29
Final Status Survey - PENELEC Switch Yard to limit the depth of the sampling effort to whatever material was above the grounding mat.
Crushed stone samples are listed with different sample numbers in the sample listing for each survey unit.
7.3 Quality Control Measurements Repeat scan measurements, soil samples and surface measurements were performed and met the applicable acceptance criteria established in Section 4.6 of SNEC Procedure E900-IMP-4520.04 (Reference 9.11). Quality Control (QC) measurements are reported in each of the applicable Appendix (A-2, B-2 & C-2). All QC measurements are taken in accordance with the requirements of Reference 9.1 and applicable site procedures which require at least 5% of the samples or static survey points to be re-done. No discrepancies are reported for these survey units and at least 5% or more of all sample and fixed point measurements were repeated with acceptable results. Many of these QC measurements or sample results are reported in the data tables.
7.4 Assessment Summary Statistical testing of the data does not need to be performed for these final status surveys since the data clearly show that the survey unit(s) meet the site release criteria. These survey units clearly meet the criterion because of the following:
- 1. : All measurements in the survey units were less than or equal to the DCGLw, and/or
- 2.
3 A background reference area was used within a structural survey design, and the difference between the maximum survey unit measurement and the lowest background reference area measurement are less than or equal to the DCGLw, and/or
- 3. 1 The mean concentration in every survey unit was less than or equal to the DCGLw, and any elevated measurement area was shown to be within the release criteria established for the SNEC facility in accordance with the SNEC LTP.
8.0 Final Status Survey Conclusions The FSS for the PENELEC Switch Yard area and was performed in accordance with the SNEC LTP and site implementing procedures. Final status survey data were collected to meet and/or exceed the quantity and quality specified for this survey unit as prescribed by the applicable survey design. The survey data for each survey unit met the following conditions:
30
Final Status Survey - PENELEC Switch Yard
- 1.
The average residual radioactivity within the 0L12-1, PS4-1 and PS4-2 open land area, and the mean gross activity concentration on structural surfaces within PS3-2, PS3a-1 and PS3b-1 is less than the applicable DCGLw.
- 2.
Areas tested met applicable EMC criteria in accordance with the SNEC LTP.
- 3.
No remediation was used to reduce levels of residual radioactivity below concentrations necessary to meet DCGLw values.
These conditions satisfy the release criteria established in the SNEC LTP and the radiological criteria for unrestricted use given in 10 CFR 20.1402. Therefore, it is concluded that the PENELEC Switch Yard Area including OL12-1 as described in this report are suitable for unrestricted release.
9.0 References 9.1 SNEC License Termination Plan 9.2 Code of Federal Regulations, 10 CFR 20.1402.
9.3 Code of Federal Regulations, 10 CFR 50.82(a)(1 1).
9.4 SNEC Facility Site Area Grid Map - Drawing Number SNECRM-020.
9.5 SNEC Calculation E900-05-021, UOL11 & Remaining OL12 Open Land Area -
Survey Design".
9.6 SNEC Procedure E900-IMP-4500.59, "Final Site Survey Planning and DQA" 9.7 COMPASS computer program, Version 1.0.0, Oak Ridge Institute for Science and Education.
9.8 NUREG-1507, 'Minimum Detectable Concentrations with Typical Radiation Survey Instruments for Various Contaminants and Field Conditions".
9.9 Visual Sample Plan computer program, Version 3.0, Battelle Memorial Institute.
9.10 SNEC Facility Historical Site Assessment Report, March 2000.
9.11 SNEC Procedure E900-IMP-4520.04, "Survey Methodology to Support SNEC License Termination".
9.12 SNEC Procedure E900-ADM-4500.60 'Final Status Survey Report".
9.13 NUREG 1575 "Multi-Agency Radiation Survey and Site Investigation Manual" (MARSSIM), revision 1 August 2000.
31
Appendix A-2
SURVEY REQUEST CONTINUATION SHEET SR NUMBER 0211 AREA/LOCATION OL12-1 SPECIFIC SAMPLING/SURVEY INSTRUCTIONS OR COMMENTS RESULTS
SUMMARY
FOR SR-0211 SR-0211 was issued to obtain radiological survey and sampling data to ensure Final Site Survey activities are complete. The survey unit covered under this SR is 0L12-1 (grids are listed in the SR). The SR required the following radiological measurements.
- Surface scan measurements using a 2-x 2" Nal detector (set to identify Cs-1 37). Survey techniques will be lAW the SR.
A total of 17 Site Surface Dose Model sample (SSDM) points were provided to be taken for analysis.
SNEC Calculation Sheet using 'COMPASS' program required 14 samples to be taken.
Site Surface Dose Model Samples (Auger Method). Obtain samples as directed in the SR. Using the auger, obtain a sample 1 meter in depth.
QC Repeat Measurements: A minimum of 5% of all surface scan measurements and sampling were re-performed using identical methodology. Soil sampling was performed by taking a second sample from the same drill hole.
QC Repeat Analysis: A minimum of 1 sample per SR or 5%, whichever is greater, of all SSDM samples were analyzed using identical methodology.
- Additional sampling/surveys were not performed.
- 1. Summary of Results A. Surface Scan Measurements (2" x 2" Nal Detector)
A 100% surface scan was required of certain grids, lAW the SR. Surface scanning was performed on all grids. A total of 55.02 % of this Class 2 area was surveyed, which is well within design basis.
Results: No areas indicated activity above the action level of >350 GCPM (gross counts per minute).
B. Surface Static Measurements No static measurements were obtained.
Results: Not Applicable.
Page 1 of2 5/31/2005 Apprwix A-2
SURVEY REQUEST CONTINUATION SHEET SR NUMBER l
0211 l AREA/LOCATION l
OL12-1 SPECIFIC SAMPLING/SURVEY INSTRUCTIONS OR COMMENTS C. Site Surface Dose Model Sampling Seventeen (17) soil samples were obtained. These samples were statistically spaced based on a random starting point due to the lack of noticeable elevated activity during final post remediation scan/static surveys.
Results: Three (3) SSDM samples taken for this SR did not contain Cs-1 37. These ranged in MDA activity from 0.12 pCig to 0.18 pCVg (for the surrogate isotope, Cs-137). For the fourteen (14) samples, not including QC samples, that did contain Cs-137, activities ranged from 0.13 pCig to 1.06 pCig. No other licensed isotopes identified for this particular SR.
- 2. Quality Control (QC) Measurements and Comparisons
- Repeat Scan measurements and Soil samples were performed and met the applicable acceptance criteria established in Section 4.6 of E900-IMP-4520.04. QC scan measurements were repeated for 7.89 % of the area scanned. Soil sample QC measurements were repeated for 11.76 % of soil samples.
- 3. Quality Control Sample Recounts
- Repeat QC replicate recount - SNEC has determined that, at a minimum, one soil sample, or five per cent (5%) of soil samples from each SR will have replicate gamma spectroscopy counts performed on them. In the case of this SR, I soil sample had a replicate count performed; sample # 5-23674, satisfying this requirement.
- 4. Exceptions and Discrepancies
- All 17 Site Surface Dose Model Samples and the 2 QC samples were taken at a depth of 6 inches to preclude interfering with the switchyard grounding grid system. Grids BB-137, BC-137, BD-137 received only a 17% scan survey due to the location of the Penelec substation. (Covered on SR-1 94).
Grid BG-132 received only 72.8 % scan survey coverage due to concrete blocks and scattered trees.
Grids BF-132 and BF-133 only received 55% scan survey and 49% scan survey coverage respectively due to the Penelec Switchyard.
- 5. Special Note(s)
- As stated previously, as this is a Class 2 area, scan coverage of approximately 10%-50% will suffice to show due diligence in survey technique for release of the site for unrestricted use.
PrintgSignature Ddte Page 2 of 2 5/31/2005
Appendix B-2
SURVEY REQUEST CONTINUATION SHEET SR NUMBER l
0193 l AREAILOCATION l PS3al, PS3-2, PS4-4 SPECIFIC SAMPLING/SURVEY INSTRUCTIONS OR COMMENTS RESULTS
SUMMARY
FOR SR-0193 SR-0193 was issued to obtain radiological survey and sampling data to ensure Final Site Survey activities are complete. The survey units covered under this SR are PS3al, PS3-2, PS4-1 (grids are listed in the SR). The SR required the following radiological measurements.
Surface scan measurements using a 2" x 2" Nal detector (set to identify Cs-1 37) and Gas Flow Proportional Counter (calibrated to Cs-1 37). Survey techniques will be lAW the SR.
- A total of 19 Site Surface Dose Model (SSDM) sample points were provided for samples to be taken for analysis in area PS4-1. SNEC Calculation Sheet using "COMPASS" program required 16 samples to be taken.
Site Surface Dose Model Samples: Obtain samples as directed in the SR. Obtain a sample 6 inches in depth.
- A total of 11 static measurements were required in area PS3a-1. A total of 11 static measurements were required in area PS3-2. This number of static measurements per survey unit is based on the 'Compass" computer program.
QC Repeat Measurements: A minimum of 5% of all surface scan measurements, surface static measurements and sampling were re-performed using identical methodology. SSDM sampling was performed by taking a second sample from the same drill hole.
QC Repeat Analysis (Replicate): A minimum of 1 sample per SR of all SSDM samples were analyzed using identical methodology.
- Additional sampling/surveys were performed at the request of the SR coordinator.
- 1. Summary of Results A. Surface Scan Measurements (2" x 2" Nal Detector)
A 100% surface scan was required of all accessible areas of certain grids, lAW the SR. A total of 89.50%
of PS4-1 a Class 1 area was surveyed, which is well within design basis.
Results: One grid, BA-1 30 contained three (3) locations greater than the action level. No other areas indicated activity above the action level of 300 GCPM (gross counts per minute). (See section #5)
Appehds?
5-2 Page I of`3 6/29/2005
SURVEY REQUEST CONTINUATION SHEET SR NUMBER l
0193 l AREAILOCATION l PS3al, PS3-2, PS4-1 SPECIFIC SAMPLING/SURVEY INSTRUCTIONS OR COMMENTS B. Surface Scan Measurements (GFPC)
A total of 100.00% of PS3-2 a Class 1 area was surveyed which is design basis. A total of 79.35% of PS3a-1, a Class 3 area was surveyed, which is well within design basis.
Results: No areas in unit PS3-2 indicated activity above the action level of >1400 GCPM (gross counts per minute). No areas in unit PS3a-1 indicated activity above the action level of >1000 GCPM C. Surface Static Measurements Design random static measurements were required in units PS3a-1 and PS3-2. In unit PS4-1 static measurements were taken in the locations of the elevated measurements.
Results: In area PS3-2, with 15 static points measured, no points exceeded the action level of > 1400 gcpm. In area PS3a-1, with 15 static points measured, no points exceeded the action level of > 1000 gcpm.
In area PS4-1, 3 static measurements were all greater than the action level at AP-1: 366 gcpm, AP-2: 525 gcpm and AP-3: 358 gcpm, which would be expected occur. (See section 4)
D. Site Surface Dose Model Sampling Twenty eight (28) SSDM samples were obtained. Two (2) SSDM QC samples were taken. These samples were statistically spaced based on a random starting point due to the lack of noticeable elevated activity during final post remediation scan/static surveys. (See section 4)
Results: Nine (9) SSDM samples taken for this SR were less than MDA. MDA activity range is from 0.05 pCi/g to 0.07 pCi/g (for the surrogate isotope, Cs-137). For the Nineteen (19) samples, not including QC samples, that did contain Cs-137activity greater than the sample MDA, activities ranged from 0.32 pCi/g to 1.23 pCi/g. No other licensed isotopes identified for this particular SR.
- 2. Quality Control (QC) Measurements and Comparisons
- Repeat Scan measurements Static Measurements and SSDM samples were performed and met the applicable acceptance criteria established in Section 4.6 of E900-IMP-4520.04.
QC scan measurements were repeated for 6.74% of the area scanned in unit PS3a-1. QC scan measurements were repeated for 23.81 % of the area scanned in unit PS3-2.. QC scan measurements were repeated for 5.09% of the area scanned in unit PS4-2.
QC scan measurements were repeated for 6.67% of the area scanned in unit PS3a-1. QC scan measurements were repeated for 6.67% of the area scanned in unit PS3-2.
SSDM sample QC measurements were repeated for 7.14% of SSDM samples.
Page 2 of 3 6/29/2005
SURVEY REQUEST CONTINUATION SHEET SR NUMBER l
0193 l AREA/LOCATION I PS3al, PS3-2, PS4-1 SPECIFIC SAMPLING/SURVEY INSTRUCTIONS OR COMMENTS
- 3. Quality Control Sample Recounts Repeat QC replicate recount - SNEC has determined that, at a minimum, one SSDM sample from each SR will have replicate gamma spectroscopy counts performed on them. In the case of this SR, 3 SSDM sample had replicate counts performed; sample #2-23334, #2-23332 and #5-23335, satisfying this requirement. In addition, monthly, approximately five per cent (5%) of all samples counted on the gamma spectroscopy system or Tri-Carb system, IAW SNEC Procedure E900-QAP-4220.02, are required to be counted for replicate analysis. (e.g. FSS soil samples) E900-IMP-4520.04 requires 5%
replicate recounts.
- 4. Exceptions and Discrepancies
- In area PS4-1 the 89.50% scan survey equates to 100% of the accessible surface areas. Items precluding 100% survey were concrete and covered in survey unit PS3-2 or PS3a-1.
- Three elevated measurements were located in grid BA-130. These elevated areas were sampled IAW..
SR Continuation Sheet.
- The SR/SD called for sampling of newly laid gravel, then sampling of soil to a depth of 4 inches. Instead of the nineteen samples called for, 28 samples were obtained at 19 locations.
- 5. Special Note(s)
- As stated previously, as this is a Class 1 area, scan coverage of approximately 100% of accessible areas will suffice to show due diligence in survey technique for release of the site for unrestricted use.
This SR is unique in that it contains Class 3 material in a class 1 area. The class 3 area also met site requirements for survey methodology.
- One QC soil sample was taken.
- Of the twelve (12) samples taken for resolution of the APs, one (1) sample was <MDA (for Cs-1 37) at 0.05 pCi/g. The eleven other samples showed positive Cs-137 activity from 0.12 pCi/g to 11.31 pCi/g
- AP-2 had a static QC measurement performed which read 453 gcpm.
- A replicate sample was performed on investigational samples for the AP #5-23852 010A S( m 14y hLLFJL BN L
(D/
Print/Signature ate Page 3 of 3 6/29/2005
Appendix C-2
SURVEY REQUEST CONTINUATION SHEET SR NUMBER l
0194 l AREA/LOCATION PS3b-I/PS4-2 SPECIFIC SAMPLING/SURVEY INSTRUCTIONS OR COMMENTS RESULTS
SUMMARY
FOR SR-0194 SR-0194 was issued to obtain radiological survey and sampling data to ensure Final Site Survey activities are complete. The survey units covered under this SR are PS3b-1 and PS4-2 (grids are listed in the SR). The SR required the following radiological measurements.
Surface soil scan measurements used a 2" x 2" Nal detector (set to identify Cs-137). Concrete scan surveys used a GFPC. Survey techniques will be lAW the SR.
- A total of 20 Site Surface Dose Model (SSDM) sample points were provided for samples to be taken for analysis. SNEC Calculation Sheet using 'COMPASS' program required 14 samples to be taken. (See Section 5).
Site Surface Samples: Obtain samples as directed in the SR. Using the auger, obtain a sample no greater than 40 cm. in depth. (See Section 4)
QC Repeat Measurements: A minimum of 5% of all surface scan measurements and sampling were re-performed using identical methodology. SSDM sampling was performed by taking a second sample from the same drill hole.
QC Repeat Analysis: A minimum of 1 sample per SR or 5%, whichever is greater, of all SSDM samples were analyzed using identical methodology.
- Additional sampling/surveys were performed at the request of the SR coordinator.
- 1. Summary of Results A. Surface Scan Measurements (2" x 2" Nal Detector)
A 100% surface scan was required of all accessible areas of certain grids, lAW the SR. A total of 76.18%
of this Class 2 area (PS4-2) was surveyed, which is well within design basis. Total surface area obtained through use of survey data.
Results: Except as indicated in Section 4, No areas indicated activity above the action level of >300 GCPM (gross counts per minute).
B. Surface Scan Measurements (Gas Flow Proportional Detector)
A 100% surface scan was required of all accessible areas of certain grids, lAW the SR. A total of 87.34%
of this Class 3 area (PS3b-1) was surveyed, which is well within design basis Results: Except as indicated in Section 4, No areas indicated activity above the action level of >1000 GCPM (gross counts per minute). Total surface area obtained through survey data.estimations and area walk downs.
Aao Apnd c-2 Page I of 4 6n28/200
SURVEY REQUEST CONTINUATION SHEET SR NUMBER 0194 AREA/LOCATION PS3b-1/PS4-2 SPECIFIC SAMPLING/SURVEY INSTRUCTIONS OR COMMENTS C. Surface Static Measurements A total of 15 points were provided in area PS3b-1 for static measurements. The COMPASS' program required a minimum of 11 static measurements in this area.
Results: Fifteen (15) static measurements were taken in PS3b-1. No areas indicated activity greater than the allowed action point of > 1000 GCPM D. Site Surface Sampling Thirty three (33) Site Surface soil samples were obtained. Two (2) Site Surface soil QC samples were taken. These samples were statistically spaced based on a random starting point due to the lack of noticeable elevated activity during final post remediation scan/static surveys. (See Section 4)
Results: Sixteen (16) Site Surface soil samples taken for this SR were less than MDA. MDA activity range is from 0.03 pCi/g to 0.23 pCi/g (for the surrogate isotope, Cs-137). For the seventeen (17) samples, not including QC samples, that did contain Cs-1 37activity greater than the sample MDA, activities ranged from 0.25 pCi/g to 2.00 pCi/g. No other licensed isotopes identified for this particular SR.
- 2. Quality Control (QC) Measurements and Comparisons Repeat Scan measurements and SSDM samples were performed and met the applicable acceptance criteria established in Section 4.6 of E900-IMP-4520.04.
QC scan measurements were repeated for 7.79% of the area scanned in Unit PS3b-1.
QC static measurements were repeated for 13.33% of the area scanned in Unit PS3b-1.
QC scan measurements were repeated for 5.82% of the area scanned in Unit PS4-2.
Site Surface soil sample QC measurements were repeated for 6.06% of Site Surface soil samples.
- 3. Quality Control Sample Recounts
- Repeat QC replicate recount - SNEC has determined that, at a minimum, one SSDM sample, or five per cent (5%) of SSDM samples from each SR will have replicate gamma spectroscopy counts performed on them. In the case of this SR, 4 Soil/Concrete sample had a replicate count performed; sample #5-23434, #1-24219, #2-23418 and #5-23417 satisfying this requirement. (See section #5)
Page 2 of 4 6/28/2005
SURVEY REQUEST CONTINUATION SHEET SR NUMBER l
0194 lAREA/LOCATIONl PS3b-1/PS4-2 SPECIFIC SAMPLING/SURVEY INSTRUCTIONS OR COMMENTS
- 4. Exceptions and Discrepancies
- Refer to the individual survey maps for locations and reasons each listed grid was not given a 100%
scan survey.
- SSDM samples were not taken for this SR. Due to the location of the Pennelec electric substation, a grounding grid is in place approximately 16 inches below the surface of the topsoil. To prevent damage to this grounding grid the majority of samples were taken from the surface to a maximum of 6" depth.
- In the case of a fresh cover of crushed rock, the surface of the rock was sampled, and then the area under the rock was sampled, which provided the large number of soil samples for this SR.
- For unit PS3b-1 the AP level was exceeded in seven (7) locations; Labeled AP-1 through AP-7.
AP-1 1028 gcpm
- AP-2 1053 gcpm
- AP-3 1030 gcpm AP-4 1122 gcpm
- AP-5 1089 gcpm
- AP-6 1011 gcpm AP-7 1004 gcpm
- A QC static point reading at AP-3 was 1135 gcpm
- For unit PS4-2 the AP level was exceeded in seven (7) locations in grid BE-1 37; Labeled AP-1 through AP-7.
AP-1 305 gcpm AP-2 306 gcpm
- AP-3 303 gcpm AP-4 359 gcpm
- AP-5 325 gcpm
- AP-6 302 gcpm AP-7 353 gcpm
- For unit PS4-2 the AP level was exceeded in grid BE-135, labeled as AP-1 with 301 gcpm
- For unit PS4-2 the AP level was exceeded in grid BF-137 twice, labeled as AP-1 with 301 gcpm and AP-2 with 316 gcpm
- For unit PS4-2 the AP level was exceeded in grid BD-136, labeled as AP-1 with 340 gcpm
- A QC static point reading at AP-1 in grid BE-1 35 was 334 gcpm Page 3 of 4 6f2812005
P SURVEY REQUEST CONTINUATION SHEET SR NUMBER 0194 AREA/LOCATION PS3b-1/PS4-2 SPECIFIC SAMPLING/SURVEY INSTRUCTIONS OR COMMENTS
- 5. Special Note(s)
- This SR covers a Class 2 area (PS4-2) and also a class 3 area (PS3b-1), scan coverage of approximately < 10%-50% will suffice to show due diligence in survey technique for release of the site for unrestricted use for these classifications. As both units received greater than a 75% minimum scan, Design Criteria has been met to a very high confidence for release of this area for unrestricted use.
- For the Alarm Points in unit PS4-2 the following action was taken Seven of the APs were sampled. Two of these samples were less than MDA for Cs-137. All others showed positive Cs-137 activity.
Four bounding samples were obtained. One of theses samples was less than MDA for Cs-137. All others showed positive Cs-1 37 activity.
MDA for samples with no positive Cs-137 activity ranged from 0.09 pCi/g to 0.21 pCi/g Samples with positive Cs-1 37 activity ranged from 0.34 pCilg to 3.10 pCi/g.
Two QC samples were obtained Two of the samples obtained were shale.
- For the Alarm Points in unit PS3b-1 the following action was taken Four of the APs were sampled. One of these samples was less than MDA for Cs-1 37. All others showed positive Cs-137 activity.
MDA for the sample with no positive Cs-137 activity was 0.10 pCi/g.
Samples with positive Cs-1 37 activity ranged from 0.11 pCi/g to 0.27 pCi/g.
One QC sample was obtained
- Guidance was provided on SR Continuation Sheets for the AP resolutions for both areas.
- SSDM samples were substituted with soil surface samples due to the Pennelec electrical grounding grid. In areas where the acronym SSDM is still in place, this acronym refers directly to the type of soil/concrete/stone sample taken for this SR.
Print/Signature
'Date Page 4 of 4 612812005