ML18052A567

HEM-15-MEMO-042 Radium Ingrowth Background - Distribute

ML18052A567
Person / Time
Site:	07000036
Issue date:	05/15/2015
From:	Evers W Westinghouse
To:	Jakub E, Barry Miller Westinghouse
References
HEM-18-7, HEM-I5-MEMO-042
Download: ML18052A567 (5)

Text

Westinghouse Non-Proprietary Class 3 Westinghouse TNTER-OFF ICE MEMORANDUM Date:

To:

From:

Cc:

May 15,2015 Brian Miller, FSS Manager Ellen Jakub, FSS Data Manager W. Clark Evers, Radiation Safety Officer Steven A. Grice HEM-I5-MEMO-042

Subject:

RadiumlngrowthBackground During review of the Survey Area Release Record for Land Survey Area 10, Survey Units 0l and 02 (LSA 10-01 and LSA 10-02), it was noted that none of the results for radium-226 (Ra-226) were positive after the background was subtracted. The value for background for Ra-226 with a 2l day ingrowth is 1.47 picoCuries per gram (pci/g). This value is the mean of the data set obtained for DO-08-003, the Hematite Radiological Characterization Report (HRCR). The data set, with the 2l day ingrowth, is presented in Table 2 of Attachment 8 of HEM-l0-80. The samples were taken and analyzed in 2005; Paragon Analytics performed the analyses.

A review of the data set for the LSAs associated with Area I (10-01, 10-02,10-03, 10-04, and 10-12) was performed. Table I presents the results for Ra-226 from Area I with a 2l day ingrowth period with sorted values for ease of reference. A total of 8 of the 72 samples taken had values above 1.47 pCilg. The mean of the data set was l.2l pCilg. [t was determined that the value of 1.47 pCilgmay not be a good representation of background.

HDP-RPT-FSS-301, Off-Site Boruow Soil Analysis 2ll2 Horine Road, Festus, Missouri, was created due to the NRC questioning the methodology and conclusions of HEM-l4-3 1. HDP staff prepared HEM-14-3l, Hematite Decommissioning Project: Radiological Testing of Bacffill Soil from an Off-site Borrow Location, to inform the U.S. Nuclear Regulatory Commission (NRC) of the measures that HDP was using for radiological testing of backfill soil brought to HDP from off-site borrow locations. HDP made the decision to collect additional samples and perform statistical analyses on the results of the borrow materials to demonstrate radiological compliance of the soils originating from the 2112 Horine Road location. The intent was also to develop a statistically acceptable methodology for use in assessing soil at other potential offsite borrow locations.

O 2015 Westinghouse Electric Company LLC, All Rights Reserved This document is the property of and contains Proprietary Information owned by Westinghouse Electric Company LLC and/or its subcontractors and suppliers. It is transmitted to you in confidence and trust, and you agree to treat this document in strict accordance with the terms and conditions of the agreement under which it was provided to you.

HEM-15-MEMO-042 May 15,2015 Page2 of 5 The radiological data that was used in HEM-14-31 was based on samples collected over a period of years for varying purposes and utilizing differing counting methodologies. To normalize analytical methods and laboratories, HDP made the decision to collect an entirely new set of data for these analyses. The Westinghouse HDP collected and analyzed soil samples from sites used to establish background soil concentrations for the HRCR. HDP collected new soil samples at 8 sample points at each of the two locations previously specified in the HRCR. Each sample location was sampled in 3 foot intervals to a depth of at least 6 feet, or until refusal was met. A total of 32 samples were taken from the two reference areas.

All the samples were analyzed for Tc-99 by ICP-MS, isotopic uranium by alpha spectroscopy, and gamma spectroscopy both with and without radium ingrowth. The same laboratory, Test America, also performs these analyses for FSS samples. The decision has been made to use the mean of the HDP-RPT-FSS-301 Ra-226 data set for 2l day ingrowth samples. Table 2 presents the HDP-RPT-FSS-301 data set for Ra-226 with 2l day ingrowth; this mean is 1.07 pCi/g. For Area l, 53 of the 72 sample results are above this value. The unknown ingrowth value of 0.9 pCilg for Ra-226 will be retained, as this value is conservative compared to HDP-RPT-FSS-301 data set (0.99 pCilg). The value for subtracting background forTh-232 (1.0 pci/g) has also been retained, since the HDP-RPT-FSS-301 data set is very close to this value.

For these reasons, please use a Radium ingrowth background of I.07 pCilg for evaluation of Final Status Survey samples effective immediately.

Attachments:

Table I - Area I Ra-226 21-day ingrowth results Table 2 - HDP-RPT-FSS-301 Ra-226 2l-day ingrowth results 5 "'(

W. Clark Evers RSO Reviewed & Approved By:

teven A. Grice Date Owner/Author:

FSS Task Manager Date 9-ao - aotf

HEM-I5-MEMO-042 May 15,2015 Page 3 of5 Ta ble I - Area I Ra-226 Results (21-dav insrow Sample ID Result (pCi/g)

Uncertainty (pCi/e)

MDA (pCi/g)

L 0-02-r2-B-E-S-00 0.734

0. 07 0.041 L 0 l2-B-E-s-00 0.763

0. 4 0.148 L 0-04-09-B-E-S-00 0.782 0.

aJ 0.059 L 0-02-r l-B-E-Q-00 0.812

0. 25 0.059 L 0-12-02-B-E-S-00 0.904 0.

6 0.094 L 0-04-05-B-E-S-00 0.929

0. 47 0.074 L 0-04-08-B-E-Q-00 0.931

0. 36 0.067 L 0 l0-B-E-s-00 0.941

0. 5t 0.086 L 0- l2-01-B-E-s-00 0.949

0. 36 0.06 L 0-02-13-B-E-B-00 0.953 0.

0.1 01 L 0-02-l l-B-E-s-00 0.956 0.

54 0.074 L 0-04-03-B-E-S-00 0.981

0. 39 0.061 L 0-04-02-B-E-S-00 0.983

0. 4 0.061 L 0-04-08-B-E-S-00 0.997

0. 44 0.068 L 0-02-01-B-s-s-00 0.998

0. 46 0.067 L 0-01-01-B-s-s-00 1.01

0. -

0.087 L 0-01-l l-B-R-s-00 1.03

0. 55 0.081 L 0-02-09-B-E-S-00 1.03

0. 67 0.083 L 0-04-01-B-R-s-00 1.06 0.

63 0.07 L 0-01-0s-B-R-s-00 1.08

0. 64 0.068 L 0-04-04-B-R-S-00 1.08

0. 54 0.06 L 0-02-02-B-R-S-00 1.11

0. 72 0.083 L 0- l2-06-B-E-S-00 l,t2

0. 72 0.076 L 0-03-06-B-E-S-00 1.13 0.

63 0.075 L 0-0 r B-E-s-00 t.t4

0. 6l 0.071 L 0-04-06-B-E-S-00 t.t4

0. 56 0.06 L 0-01-04-B-s-s-00 l.l6 0.

7 0.075 L 0-02-04-B-s-s-00 l.l6 0.

81 0.055 L 0-02-08-B-E-S-00 t.l6

0. 59 0.066 L 0-04-07-B-E-S-00 1.16

0. 77 0.06 L 0-r2-04-B-E-S-00 1.16 0.

7 0.079 L 0-02-07-B-E-S-00 t.t7

0. ll 0.1 34 L 0-01-07-B-R-s-00 r.2

0. 67 0.07 L 0-04-14-B-E-B-00 t.2 0.

88 0.099 L 0-0 r B-E-s-00 t.2l

0. 97 0.103 th)

HEM-I5-MEMO-042 May 15,2015 Page 4 of 5 Ll0-01-l s-B-s-s-00 t.2l

0. 78 0.09 L l0-02-05-B-R-S-00 t.2l

0. 65 0.067 L I 0-03 B-E-S-00 t.2l

0. 64 0.064 L l 0-03 B-R-S-00 1.23 0.

85 0.087 L l0-01 B-R-S-00 1.24

0. 79 0.079 Ll0-04-l 1-B-E-S-00 1.25

0. 98 0.1 01 Ll0-12-05-B-R-S-00 1.25 0.

85 0.077 Lr0-12-r2-B-E-S-00 t.2s

0. 7l 0.07 Ll0-04-10-B-R-s-00 1.26 0.

82 0.075 L l0-01 B-R-S-00 1.27

0. 79 0.078 Ll0-01-18-B-E-B-00 1.27

0. 99 0.099 Ll0-01-16-B-R-S-00 1.3 0.

81 0.067 Lt0-04-12-B-E-S-00 1.3 0.

9 0.081 L l0-03-04-B-E-S-00 l.3l

0. 93 0.094 L I 0-03 B-E-S-00 1.32

0. 87 0.086 Lt0-t2-t4-B-E-B-00 1.33 0.

85 0.077 L l0- l2-08-B-R-S-00 1.34

0. 77 0.06 L10-12-13-B-E-B-00 1.34 0.217 0.1 07 L10-03-07-B-E-Q-00 r.35 0.r97 0.085 Ll0-12-10-B-R-S-00 1.35 0.221 0.121 L l0-12-03-B-E-S-00 1.39 0.192 0.087 Ll0-01-14-B-E-S-00 1.4 0.1 83 0.074 Ll0-01-13-B-E-Q-00 1.4 0.219 0.121 Ll0-03-12-B-E-B-00 l.4l 0.1 83 0.08s L l0- l 2-07-B-E-Q-00 t.43 0.2t4 0.093 Ll0-03-03-B-E-S-00 t.44 0.201 0.085 L l 0 13-B-E-B-00 1.44 0.199 0.08 Ll0-03-0s-B-E-s-00 t.46 0.2rs 0.087 Ll0-01-13-B-E-s-00 1.47 0.2 0.069 Ll0-03-01-B-E-s-00 1.5 0.2r 0.093 Ll0-t2-07-B-E-S-00 r.53 0.204 0.083 Ll0-12-09-B-E-S-00 1.6 0.247 0.1 l5 L l 0 I 3-B-E-B-00 t.6l 0.242 0.1 09 L I 0-03 B-E-S-00 t.62 0.241 0.1 13 Ll0-03-10-B-E-B-00 r.63 0.244 0.111 Lt0-t2-l l-B-E-s-00 r.63 0.208 0.078 Ll0-03-l 1-B-E-B-00 1.8 0.243 0.098

HEM-15-MEMO-042 May 15,2015 Page 5 of5 Table 2 - HDP-RPT-FSS-301 Ra-226 Data Set 2l-da Reference Area Results Sample ID Radium-226 (pcilg) 2l Day Ingrowth (pCi/g)

Result Error MDC 9574-SS-409 0-0 -01 l.l5

0. 64 0.0678 9574-SS-409 0-0 -02 0.719

0. 03 0.0447 9574-SS-409 0-0 -03 1.04

0. 66 0.0772 9574-SS-409 0-0

-04 l.0l 0.

38 0.0513 9574-SS-409 0-0 -05 0.995 0.

6 0.0848 9574-SS-409 0-0

-07 0.858 0.

JJ 0.0642 9574-SS-409 0-0 -08 1.03

0. 43 0.064 9574-SS-409 0-0 -09 1.08

0. 69 0.0702 9574-SS-409 0-0 -10 l.17

0. 74 0.0772 9574-SS-409 0-0 -l I 0.972

0. 36 0.0838 9574-SS-409 0-0 -t2 1.22

0. 84 0.0858 9574-SS-409 0-0 -13 1.02

0. 4 0.0759 9s74-SS-409 0-0

-14 l.0s 0

46 0.060s 9s74-SS-409 0-0 -15 0.80s

0. 2l 0.0579 9s74-SS-409 0-0 -t6 r.32 0.201 0.0904 9574-SS-409 0-0

-17 l.l9 0.1 65 0.0698 9574-SS-409 0-0 -18 1.34 0.193 0.0845 9574-SS-409 0-0 -20 1.26 0.206 0.1 09 9574-SS-409 0-0

-21 1.07 0.1 56 0.0738 9s74-SS-409 0-0 11

-LL 0.922 0.131 0.0573 9574-SS-409 0-0 -zJ l.13 0.17 0.083s 9s74-SS-409 0-0 -24 1.2 0.1 6s 0.0649 9574-SS-409 0-0

-25 l.23 0.r64 0.06s3 9s74-SS-409 0-0 -26 1.08 0.1 59 0.079 9574-SS-409 0-0 -27 l.3l 0.1 85 0.0818 9574-SS-409 0-0 -28 r.28 0.1 88 0.089 9574-SS-409 0-0

-29 1.08 0.1 54 0.0808 9574-SS-409 0-0 -30 0.96 0.1 61 0.0864 9s74-SS-409 0-0 -31 1.06 0.146 0.0498 9574-SS-409 0-0 -JZ 1.06 0.157 0.0709 9574-SS-409 0-0

-33 1.03 0.147 0.0689 9574-SS-409 0-0 -34 0.618 0.0993 0.04 rowth)