ML043500248

Final Status Survey Release Record FA-0100-02, Rev 0, Containment Building Survey Unit 2

ML043500248
Person / Time
Site:	Maine Yankee
Issue date:	12/07/2004
From:	Donna Anderson, Broutigom T, Pillsbury G Maine Yankee Atomic Power Co
To:	NRC/FSME
References
FA-0100-02, Rev 0
Download: ML043500248 (30)

Text

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FA-0100 CONTAINMENT BUILDING SURVEY UNIT 2 Prepared By:

Date:

-3°-oV FSS Enginee r, Signature Printed 'ame Reviewed By:

Date: to Wo (o4 FS pecialist - Signature LIA.

f y 90 te Printed Name Reviewed By:

A" $?lcU4D Date: n i 1o/4 Independent Revievw - Signature n,1 pir#Nme/

Approved By:

V f A Date: //2 crintcnde

-gnature Printed Nm Approved By:

t Date: Z,)/o, KFSS, MOP - Signature Printed Name Revision 0

MAINE YANKEE FINAL STATUS SURVEY RELEASE RECORD FA-0100 CONTAINMENT BUILDING SURVEY UNIT 2 A. SURVEY UNIT DESCRIPTION Survey Unit 2 is located in Survey Area FA 0100, the Containment Building interior. The Containment Building is located in the restricted area between the Fuel Building and the Spray Building centered at site coordinates 407,575 N and 623,810 E. The Containment Building is show n in relation to other major site structures in map FA 0100. All maps referenced in this release record are provided in Attachment 1, unless otherwise noted.

Survey Unit 2 consisted of the surface of the Containment Building floor (bare steel liner) on the

-4 foot elevation. The physical configuration of Survey Unit 2 in relation to the remaining survey units in the Containment Building is provided in map FA 0100-UNITS (Attachment 1).

The survey unit has a surface area of approximately 102.1 in2.

B. SURVEY UNIT DESIGN INFORMATION The survey unit was known to have been contaminated to levels in excess of the release limits and required an extensive remediation effort prior to FSS. Given the high probability of residual contamination, the area was designated a Class I survey unit per the LTP.

The survey unit design parameters are shown in Table 1. Given a relative shift of 1.3, it was determined that 21 direct measurements were required for the Sign Test. The design was conservatively based on 30 direct measurements. Thirty-two measurements actually fell in the survey unit. Each sample location was determined using a fixed square grid with a random start point. These locations are presented on survey map FAOI00-U2-DIRECTS (Attachment 1).

Once the direct readings were completed, removable contamination samples were obtained at each measurement location.

A 100% scan coverage of the area was required. The survey was designed to include 588 scan grids each of approximately 2 m2 area. Instrument scan setpoints were conservatively set below the DCGLEN1C, as shown in Table 2-2 (Attachment 2). The location of the scan grids is shown on maps FA 0100-U2-A through FA 0100-U2-J (Attachment 1).

To accommodate measurement geometry requirements for surfaces of non-uniform smoothness (including junctures), the SHP-360 and the 43-68 probes were used to augment the scan survey.

First, a 43-37 scan was performed on all surfaces, including those unlikely to meet geometry requirements for that model of probe. Then a repeat scan, using the SHP-360, was performed on areas with surface irregularities that required a smaller probe size. Ninety-degree surface junctures (i.e., wall-pedestal junctures) were scanned using the 43-68 probe with a reduced efficiency.

Background values were established for each particular instrument probe application based on ambient background values in the survey area. No material backgrounds were included because of the minor background contribution from bare steel. The background values, listed in Table 1, were used to establish net activity for direct measurements, scan investigation levels, and to confirm the scan MDCs used were appropriate.

FA-0100-02, Revision 0 Page 2 of 30

The instruments used in this survey unit are listed by model and serial number in Attachment 2 (Table 2-1). Scan MDCs are also listed in Attachment 2 (Table 2-2) and are also compared to the DCGL, the investigation level, and the DCGLENMC. As shown in this table, the scan MDC is less than the investigation criteria in all cases, thus providing high confidence (95% or higher) that an elevated area would be detected in the scanning process. Since the investigation level at the alarm setpoint was always less than the design DCGLENMC, no EMC sample size adjustment was necessary.

TABLE I SURVEY UNIT DESIGN PARAMETERS Survey Unit J Design Criteria l

Basis Area 1,102.1 m' Section 5, LlP, Class I (Reference 1)

Number of Direct Measurements Required 21 Based on an LBGR of

2.

1 9,000 dpm/100 cm, sigma of 6,853 dpmn/I00 cm2, and a relative shift of 1.3.

Type =Type II = 0.05 Sample Area 36.7 m2 1,102 m2 / 30 samples' Sample Grid Spacing 6.0 m (36.7) l Scan Grid Area 2 m' (approx.)^

2 Area Factor 1.3 50 m /36.7 m' per LTP, Rev. 3 Scan Area 1102.1 m2 Class I - 100%

Background

g

?

43-68 Direct and Scan (flat surfaces) 584 dpm/100 cm2 Ambient only SHP-360 Scan (surface irregularities) 940 dpm/100 cm2 Ambient only 43-68 Junctures 1,519 dpm/I00 cm2 Ambient only 43-37 Scans (flat surfaces) 334 dpm/100 cm2 Ambient only Scan Investigation Level DCGL plus See Table 2-2 background (Attachment 2)

DCGL 18,000 dpm/100 cm2 LTP, Rev. 3 (Reference 1)

Design DCGLENIC 23,400 dpm/19F cm2 LTP, Rev. 3 (Reference 1)

C. SURVEY RESULTS Thirty-two direct measurements were made in Survey Unit 2. All direct measurements were less than the DCGL. Direct measurement data are presented in Table 2.

Scanning resulted in four verified alarms. Three alarms occurred while scanning flat surfaces with the 43-37 probe. One alarm was verified while scanning with the SHP-360. No alarms occurred while scanning junctures. The subsequent investigation work is discussed in the following section.

LTP Revision 3, Table 5-IA for Containment El.-2 ft., AOI00 2

Number of required measurements increased as a measure of conservatism. This survey unit was initially designed for N = 30 samples. The N = 30 design led to a survey unit map with 32 locations on the systematic grid.

FA-0100-02, Revision 0 Page 3 of 30

TABLE 2 DIRECT MEASUREMENTS Gross ctiviNet Activity Sample Location GrossActiiit (Table I Background Subtracted) dpmflOO cm dpm/100 cm 2 FA0100-2-M001 640 55 l FA0100-2-M002 606 22 IAO 1 00-2-M003 914 329 FA0100-2-M004 743 159 FA0100-2-M005 729 144 J-A0100-2-M006 688 103 FA010f--2-M007 700 115 FAO100-2-M008 587 2

FA0100-2-M009 637 53 FA0100-2-M010 868 284 FAOI00-2-MOI1 815 231 F A0100-2-M012 719 135 F A0100-2-M013 529

-55 FA0100-2-M014 608 24 FAOIOO-2-M015 777 192 FA0100-2-M016 661 77 FAO 100-2-MO 17 998 414 FAA0100-2-M018 630 46 FAO100-2-M019 671 87 FAOIOO-2-M020 729 144 FA0100-2-M021 859 274 FIA0100-2-M022 832 248 FA0100-2-M023 676 91 FAI0100-2-M024 676 91 FA0100-2-M025 681 96 FAO100-2-M026 782 197 FAO100-2-M027 2,744 2,160 FAO100-2-M028 652 67 FA0100-2-M029 709 125 FA0100-2-M030 652 67 FAO100-2-M031 700 115 FAO10O-2-M032 760 176 Sample Mean 780 196 Median 700 115 Standard Deviation 372 372 Sample Range 529 - 2,744 2,160 D. SURVEY UNIT INVESTIGATIONS PERFORMED AND RESULTS The scan process identified 4 locations of potentially elevated activity. An investigation was performed for each location using survey investigation package XAOIOO-02. The investigation results and assessment are summarized in Attachment 3 (Table 3-1).

FA-0100-02, Revision 0 Page 4 of 30

E. SURVEY UNIT DATA ASSESSMENT An analysis of the direct sample measurement results, including the mean, median, standard deviation, and sample range, are provided in Table 2. The direct measurements were all below the DCGL without subtracting background. The maximum result, with background subtracted, is equivalent to 2,160 dpm/100 cm2. When adjusted for background (ambient background subtracted), the mean residual contamination level is 196 dpmllr00 cm2. For a DCGL of 18,000 dpm/l 00 cm2, this is equivalent to an annual dose rate of 0.003 mremny.3 The four alarms wvere investigated as shown in Table 3-1 of Attachment 3 and determined to be less than 1.2% of the Elevated Measurement Comparison unity limit, thereby satisfying the EMC criterion.

F. ADDITIONAL DATA EVALUATION provides additional data evaluation associated with Survey Unit 2, including relevant statistical informnation. Based on survey unit direct measurement data, this attachment provides the Sign Test Summary, Quantile Plot, Histogram, and Retrospective Power Curve.

I. The Sign Test Summary provides an overall summary of design input (Table 1) and resulting calculated values used to determine the required number (N) of direct measurements (per LTP Section 5.4.2). The Sign Test Summary is a separate statistical analysis that also calculates the mean, median, and standard deviation of the direct measurements.

The critical value and the result of the Sign Test are provided in the Sign Test Summary Table, as well as a listing of the key release criteria. As shown in the table, all of the key release criteria were clearly satisfied for FSS of this survey unit.

2. The Quantile Plot was generated from direct measurement data listed in Table 2 and indicates general symmetry about the median. The data set and plot are consistent with expectations for a Class I survey unit. There is no reason to conclude that the data set represents other than random variations in a Class 1 basement survey unit. It also should be noted that the 22 maximum net activity (2,160 dpm/100 cm2 at location M027) is well below the DCGL of 18,000 dpmll 00 cm2.

3. A histogram plot was also developed on the direct measurement values. This plot shows that the direct data were essentially a log-normal distribution with I outlier.

4. A Retrospective Power Curve was constructed based on FSS results. The curve shows that the survey unit having a mean residual activity at a small fraction of the DCGL, has a high probability ("power") of meeting the release criteria. Thus, it can be concluded that the direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and that the data quality objectives were met.

3 This annual dose equivalent is based on LTP Table 6-1 1 which shows the contaminated concrete dose contribution (for surfaces contaminated at the DCGL) to be 0.301 mrem/y.

FA-0100-02, Revision 0 Page 5 of 30

As mentioned in Section B, removable contamination samples wvere obtained at each (direct) measurement location. In that this survey unit involved a (backfilled) basement and not a standing building, the removable contamination measurements were not applicable to release decisions for the survey unit. However, the samples were obtained and evaluated, indicating less than MDA values for alpha and beta activity (i.e., < 3.8 dpm/100 cm2). Thus, in comparison with the mean survey unit net activity (Table 2), the removable contamination sampling effort indicated that the activity is fixed.

G. CHANGES IN INITIAL SURVEY UNIT ASSUMPTIONS ON EXTENT OF RESIDUAL ACTIVITY The survey was designed as a Class I area; the results were consistent with that classification.

The post-remediation direct measurement sample standard deviation was less than the design sigma. Thus, a sufficient number of sample measurements were taken and no additional measurements are required.

II. LTP CHANGES SUBSEQUENT TO SURVEY UNIT FSS The FSS of Survey Unit 2 was designed and performed using the criteria of the approved LTP, Revision 3 Addenda (Reference 1, 2, 3) and the license amendment for activated concrete (Reference 4).

1. CONCLUSION The FSS of this survey unit was designed based on the LTP designation as a Class I area. The survey design parameters are presented in Table 1. The required number of direct measurements wvas determined for the Sign Test in accordance with the LTP. As presented in Table 2, all beta direct measurements were less than the DCGL of 18,000 dpm/l 00 cm2.

A Sign Test Summary analysis demonstrated that the Sign Test criteria were satisfied. The direct measurement sigma wvas determined to be less than that used for design, thus indicating that a sufficient number of samples wvere taken.

The Retrospective Powver Curve shown in Attachment 4 confirmed that sufficient samples were taken to support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and the data quality objectives were met. Attachment 4 also revealed that direct measurement data represented essentially a log-normal distribution, with variance consistent with expectations for a Class I survey unit.

The scan survey design for this survey unit was developed in accordance with the LTP with significant aspects of the design discussed in Section B and Table 1. Attachment 3 shows the areas identified by verified alarms and provides the results of the investigation actions. The areas under investigation were evaluated using the appropriate area factor. The survey unit wvas determined to satisfy the elevated measurement comparison unity rule per the LTP methodology.

In addition, while not part of the release decision criteria, removable contamination sampling confirmed that the majority of remaining activity in this basement survey unit was fixed.

It is concluded that FAO 100 Survey Unit 2 meets the release criteria of I OCFR20.1402 and the State of Maine enhanced criteria.

FA-0100-02, Revision 0 Page 6 of 30

J. REFERENCES

1. Maine Yankee License Termination Plan, Revision 3, October 15, 2002

2. Maine Yankee letter to the NRC, MN-02-061, dated November 26, 2002

3. NRC letter to Maine Yankee, dated February 28, 2003

4. Maine Yankee letter to the NRC, MN-03-049, dated September 11, 2003 FA-0100-02, Revision 0 Page 7 of 30

Attachment I Survey Unit Maps FA-0100-02, Revision 0 Page 8 of 30

Maine Yankee Decommissioning Team Maine Ynkee Decoiniissioniiig Project Sini'ey For ap ID

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nI 00 FA-0100-02, Revision 0 Page 21 of 30 Survey Unit Instrumentation FA-0 100-02, Revision 0 Page 22 of 30

TABLE 2-1 INSTRUMENT INFORMATION E-600 S/N

[ Probe S/N (type) 1625 190329 (43-37) 1648 168748 (43-37) 2488 190327 (43-37) 2489 190327 (43-37) 2618 190752 (43-37) 1929 148934 (43-68) 1933 149075 (43-68) 1648 148937 (43-68) 2489 148932 (43-68) 1625 459 (SHP-360) 2618 453 (SHP-360) 2618 464 (SHP-360) 2618 461 (SHP-360)

TABLE 2-2 INSTRUMENT SCAN MDC, DCGL, INVESTIGATION LEVEL, AND DESIGN DCGLENIC 43-68 43-68 SHP-360 43-37 Detector 43-68 4uc6e Surface Flats j

Junctures Irregularities Flats Scan MDC 722 1,875 2,247 1,404 (dpm/100 cm2)

(Note 1)

(Note 1)

(Note 1)

(Note 1)

DCGL 18,000 18,000 18,000 18,000 Investigation 19,400 Level 18,579 19,498 18,797 DCGL plus (Alarm Setpoint)

- DCGL plus

- DCGL plus

- DCGL plus

Background

(dpm/l 00 cm2)

Background

Background

Background

(Note 2)

(Reference 2)

Design DCGL ic (dpm/I00 cm) 23,400 23,400 23,400 23,400 (from RR Table 1)

NOTES:

1. Scan MDC from LTP, Revision 3, Table 5-6, was adjusted for a change in efficiency due to different material and/or geometry.

2. Investigation level was calculated for only 126 cm2 of detection surface area.

FA-0100-02, Revision 0 Page 23 of 30 Investigation Table FA-0100-02, Revision 0 Page 24 of 30

TABLE 3-1 INVESTIGATION TABLE Scan Alarm Scan Investigation

_____DCGLEMC Comparison Alarm Initial Maximum Area Elevated Area XGLESC Elevated Area

.t Scan Scaler Area ar DCGLEMC Atvity Grid No.

Sepmt Value Value (cm2)

F)t (dpm/100 cm2)

(dpm/A00 cmt2i Factor (cpm)

(cpm)

(cpm)4 A) dm10c 2 6 Fco M151 (43-37) 8,800 18,110 6,420 N/A N/A N/A

< DCGL 0.OOE+00 M165 (43-37) 8,800 9,720 2,070 N/A N/A N/A

< DCGL 0.OOE+00 M169 (43-37) 8,800 13,300 2,030 N/A N/A N/A

< DCGL O.OOE+00 M483 (SHP-360) 8007 2,790 1,994 200 2,500 4.50E+07 46,852 0.0010 Survey Unit DCGL =

Survey Unit Remainder N/A N/A N/A N/A 18,000 Mean = 196 0.0109 Total 0.0119 4

5 6

7 Scan alarms occurring with the 43-37 were investigated with the 43-68 detector.

For investigation purposes, consistent with LTP dose modeling for basement concrete surfaces and LTP Section 6.8.1, a conservative area factor was determined by the formula of AF = 50 m2/actual size of the elevated area.

As an additional conservatism, the background and survey unit mean activity have not been subtracted in calculating the elevated area activity.

The original SHP-360 alarm setpoint was 1000 cpm. The data was evaluated using a revised setpoint of 800 cpm.

FA-0100-02, Revision 0 Page 25 of 30 Statistical Data FA-0100-02, Revision 0 Page 26 of 30

Survey Package FA-0100 Unit 2 Surface Sign Test Summary Survey Package:

FA-0100 Containment Building Survey Unit:

02 Evaluator:

GP DCGLw:

18,000 DCGLerm:

23,400 LBGR:

9,000 Sigma:

6,853 Type I error:

'0.05 Type II error:

0.05 Total Instrument Efficiency:

33.0%

Detector Area (cm2):

126 Choosing 'N/A' sets material Material Type:

NIA background to "0"

.=iesi:;z

.- Mb M

Z<: ;1 645 Z1: 645 Sign p:

0.903199 Calculated Relative Shift-:

3 Relative Shift Used:

3'i 3 Uses 3.0 if Relative Shift >3 N-Value:

+

N-Value+20%:

-z.

21l

,;*i;SR"U~~Static if a'Mci.uValu.

,Gi 1

Number of Samples:

32 Median:

1 i_

Mean:

Net Static Data Standard Deviation: :

-372 Total Standard Deviation:.!

372 SRSS Maximum: I' i

2 160 Adjusted N Value:

e.

i.-2A',__

___32 S+ Value:,..-

?.',

32 Critical Value: :W *z;->'¢"21

't e r

r~~~ia-'Stisfaton,6,-X Sufficient samples collected: 'c.P ass L

Maximum value <DCGL,:.....

2.

Pass Median value <DCGL,:

Mean value <DCGL,:

ass Maximum value <DCGL,,,: '

Total Standard Deviation <=Sigma: a Sign test results:,

The survey unit passes all conditions: -.

fPass FA-0100-SU2-SudfaceSign 11)10)04 2:39 PM FA-0100-02, Revision 0 Page 27 of 30

FA-0100 SU-2 Quantile Plot I

2500

,2000 0

5 1

• Activity (dpm/i 00 cm2)

{ - Median (dpm/100 500 cm I

0 25 50 75 10 Percent l-

Page/Date/Time Database Variable One-Sample T-Test Report 2 11/22/04 10:13:11 AM C:\\Program Files\\NCSS97\\FA0100SU-2.S0 C2 Plots Section Histogram of FA-0100, SU-2 30.000.

Un a)C.E 0E z

22.500-15.000-7.500-v d.v0loVO 250.000 0o00.000 1750.000 2500.000 Activity (dpml100 cm2)

FA-0 100-02, Revision 0 Page 29 of 30

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