ML20213E312
| ML20213E312 | |
| Person / Time | |
|---|---|
| Site: | Wood River Junction |
| Issue date: | 10/15/1986 |
| From: | Berger J OAK RIDGE ASSOCIATED UNIVERSITIES |
| To: | Crow W NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 27525, NUDOCS 8611130099 | |
| Download: ML20213E312 (8) | |
Text
*" * " W h W r-RETURN IQ 396-SS
- 1. 34c&&66 Oak Ridge Manpower Education, Associated Post Office Box 117 Research, and Training Universities Oak Ridge, Tennessee 37831-0117 Division
-9,
o' 9
October 15, 1986 RECEIVED h:.
g.
l OCT 211986 Mr. William Crow (U.LNE!IAR U
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Division of Fuel CycleC&l'efaterial
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- p'. go NMSS-SS396, Nucl a
.eguj to C mission C
Washington, D.C.
0 $$ 4 I
Y 119N p~._
Subject:
FOLLOWUP SURVEY OF OUTSIDE AREAS AT UNC - WOOD RIVER El T16h I
'I WhvJ8 sT t i,. n_,.,
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Dear Mr. Crow:
s (E
On September 26,1986, I visited the UNC f acilities in Wood Riv f or the purpose of resurveying those areas where residual radionuclide contamination had been identified by earlier surveys (Figure 1).
Walkover gamma scans were conducted over each of these grid blocks. Additional grid blocks in.
the area of the lagoon were also scanned. Locations exceeding twice ambient background levels were identified in grid blocks B-036, D-094, B-024, B-082,.
B-084, B-085, B-137, B-138, B-139, B-140, B-049, B-050, B-058, and B-059.
These locations, shown on Figures 2 and 3, were small, compared to the grid block area, and maximum levels were less than 10 times the background exposure rate.
At 1 meter above the surf ace, exposure rates are less than 10 pR/h above background. The sources of the elevated levels in blocks B-024 and D-036 were identified and removed. No actions were conducted on other locations during my visit to the site.
Composite soil samples were then obtained f rom the surf ace of grid blocks.
Sampling was perf ormed by obtaining approximately equal quantities of soil f rom the grid center and f our locations, midway be, tween the grid center and the grid corners. The 5 samples were mixed and about 1 kg was removed f or laboratory analysis. For grids which were only partially soil covered, the composite was prepared f rom 5 samples spaced throughout the soil area. Several grids were predominantly asphalt surf aces and composites included residual soil deposits which had accummulated on the asphalt surf ace. There were no attempts to selectively sample areas of elevated surf ace gamma radiation.
The results of soil analysis, presented in Table 1, indicate residual U-235, i
U-238 and Cs-137 in some of the grid blocks. Concentrations of other radionuclides are within the ranges for background soil f rom this region.
1 Two samples were also obtained f rom " hot-spots" in excavated areas of grid l
blocks B-138 and B-139.
These samples contained 8612 and 7812 pCi/g of Cs -137.
No other radionuclides were noted at elevated concentrations.
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Mr. William Crow 2
October 15, 1986 On the basis of these results, there appear to be areas of U-235 surf ace soil contamination, indicative of total uranium concentrations in excess of the Branch Technical Position levels. Isotopic uranium to determine 234/235 rates will be perf ormed on selected samples and results provided later.
Questions should be ref erred to me at FTS 626-3305.
Sincerely, James D. Berger, Manager Radiological Site Assessment Program JDB/sjf Enclosure cc:
J. Roth, NRC, Region I i
TABLE 1 RADIONUCLIDE CONCENTRATIONS IN COMPOSITE SURFACE SOIL SAMPLES UNC - WOOD RIVER JUNCTION Grida Radionculide Concentrations (pCi/g)
Block U-235 U-238 Cs-137 B002 1.4 i 0.9 1.5 i 1.9 0.2 0.1 B021 4.5 1 0.8 4.0 i 1.0 0.2 0.1 B023 0.5 1 0.5 1.1 1 2.0 0.4 i 0.2 B024
<0.2 1.6 i 1.3
<0.1 B027
<0.3 2.7 i 1.7
<0.1 B028 0.6 1 0.6 1.1 i 2.2
<0.1 B033 0.5 1 0.5 1.7 i 0.7
<0.1 B036 3.1 1 0.7 3.1 1 0.9 0.6 i 0.1 B037 1.0 1 0.9
<1.1 0.2 1 0 1 B038 1.2 1 0.5 0.7 1 0.7
<0.1 B055
<0.3 1.5 i 1.6
<0.1 B064 0.3 1 0.7 1.4 1.6
<0.1 B083
<0.3 0.9 1 1.0 2.3 1 0.2 B085
<0.3 1.5 1 2.0 7.5 1 0.4 B126 7.3 i 1.0 6.8 1 1.2 0.5 1 0.1 B130 0.4 0.7 2.0 t 1.7 1.8 1 0.2 B134 0.8 1 0.6 1.9 0.6 1.5 1 0.2 B135 1.0 1 0.7 1.6 i 1.6 1.3 1 0.2 B137 0.9 1 0.9 5.8 i 2.1 17 11 B134
<0.5
<l.3 22 i1 B140
<0.4 1.2 i 0,9
,7.9 1 0.5 D064 3.4 1 0.7 1.9 i 1.9 0.2 i 0.1 D065 1.8 i 0.6 1.0 1 0.7 0.1 0.1 D066 1.1 1 0.8 3.3 i 1.7 0.1 1 0.1 D067 1.4 1 0.6 0.9 1 1.9 0.1 1 0.1 D068 3.2 t 0.9
<l.0 0.2 i 0.1 D069 34 i2 2.9 1 3.5 0.8 1 0.2 D070 13 1 1 8.4 1 1.3 0.4 1 0.1 D072 6.1 i 0.9 2.1 1 1.4 0.7 1 0.2 D078 13 12 1.2 1 3.2 0.3 1 0.1 D081 1.8 i 1.0 1.8 i 1.4 0.3 0.2 D085 36 i2 32 i3 1.5 1 0.2 D089 1.7 1 1.0
<l.1 1.0 1 0.3 D092 0.6 1 0.6 1.4 i 1.6 0.9 i 0.2 D094 27 12 20 13 0.3 i 0.1 D096 8.7 i 1.6 3.9 1 2.2 0.2 0.1 D102
<0.2 1.3 i 1.4
<0.1 a Ref er to Figure 1.
b Errors are 2a based on counting statistics.
3
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ANNEX 8014 D071' '
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01:FICE P RODUC TION M.'. 8044 D096d4D101 8076 8090 8104 8118 B015 B016 DO53 AREAL AREA i
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I" FIGURE 1:
Grid System Established for Reference Indicating Blocks Resurveyed (shaded areas)
UNC A
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80C1 8003 8009 8013 8019 8023 8026 8029 8032 8035 8042 8049 8058 POC7 -
8081 8095 8109 I
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8002 D064 D072 0080 8122 8127 8132
- B137, 8050 8059 8048 8082 8096 8110 tl s
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D551~'HT25j e128 esas eU8 B051 8060 8069 8083 8097 8111 l
l WAREHOUSE 0066 DD74 B124 8129 B134 B139 8052 8061 8070 8084 8098 8112 s,
NGAS 0039 0 049 D067 0075 BLDG.
B130 B135 8140 8053 B062 8071 BOSS 8098 8113 D0 52 B125 4
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26 a 3i Bi36 Bi4i w92 w97 8072 8086 Biw Sn4
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8074 8088 8102 8116
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ANNEX e
8014 0071 0079
.D086 8037 B043 D095 0100 8075 8089 8103 8117 i)05 2 8004 B0 11 l
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1 0053 8005[ 8015 8016 I
P RODUCTION D102 8044 D 70 6 D101 8076 8090 8104 8118 OrFICE AREAL AREA
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8038 8045 B054 8063 8077 8091 8105 8119 8010 I
I DOS 5 B007 8011 8017 8021 8024 8027 8030 B033 8039 B046 B055 8064 8078 8092 8106 8120 e
I D056 8008 B012 8018 B022 B025 8028 B031 B034 8040 8047 8056 8065 8079 8093 8107 8121 I
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N FIGURE 2: Locations (e) of Elevated Contact Gamma Radiation Identified by Surface Scans a
UNC2 B042 8049 BOSS B067 8081 B095 l
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/i 805 [ J B059 '
B068 B082 8096 B137 L
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B053 B062 9071 h085 B140
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AREAS OF Lj'J i
ELEVATED CONTACT
-d RADIATION BO41 8092 B097 B072 BOS6 B100 FIGURE 3: Locations of Elevated Contact Gamma Radiation Levels identified by Surface Scans of the Lagoon Area u.
80(1 8003 8009 8013 8019 8023 8026 8029 8032 8035 8042 8049 8058 8067 8081 8095 8109 I
8002 0064 0072 0080 8122 8127 8132 8137 8050 8059 6068 8082 8096 8110 I
E 073 15531 8123 8128 8133 83 8 8051 8080 8069 8083 8097 8111 l
l WAREHOU SE 0066 0674 8124 8129 8134 8139 8052 8061 8070 8084 8098 8112
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NG LS 0039 0 049 D067 0015 BLDG.
8130 8135 8140 8053 8062 8071 8085 8099 8113 D0 52 8125 4
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D068 D076 0083 8126 8131 810..
8141 0092 0097 8072 8086 8100 8114 s
L D057 0060 D063 I
DO! O 005 L D061 0065 0077 0084 D087 0088 0089 0090 D093 0098 8073 8087 8101 8115 I
'D05 1 00!9 0062 0070 Ob78' D685 8036 0091 0094 0099 8074 8088 8102 8116
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ANNEX 0052 8004 Bot!
8 014 0071 D079 0086 8037 8043 D005 ~
01C0 8075 8089 8103 8117 l
a l
l 0053 8005[801 OFFICE P RODUCTION D102 807 4' DOS 3 D101 8076 8090 8104 8118 6
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0054 8006 'd 8015A g
8038 8045 8054 8063 8077 8091 8105 8119 8010 1
1 005 5 8007 8011 8017 8021 8024 8027 8030 8033 8039 8046 8055 8064 8078 8092 8106 8120 I
D058 8008 B012 8018 8022 8025 8028 8031 8034 80 W$647 5056 8065 8079 8093 8107 8121 I
J 30ft.
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FIGURE 4:
Grid System Established for Survey Reference Within the Restricted Zone
,