ML20154Q944
| ML20154Q944 | |
| Person / Time | |
|---|---|
| Site: | 07000036 |
| Issue date: | 05/20/1988 |
| From: | Eskridge H ABB COMBUSTION ENGINEERING NUCLEAR FUEL (FORMERLY |
| To: | Bidinger G NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 24372, NUDOCS 8806070172 | |
| Download: ML20154Q944 (6) | |
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Division of Fuel Cyc al Academic, and Commercial Use Safety
' @h U.S. Nuclear Regulatory Commission Washington, DC 20555
Dear Mr. Bidinger:
As we discussed during your recent visit to the Hematite plant, this is a status report to furnish additional data for the evaporation pond decommissioning and the spent limestone monitoring projects.
After removing over 2600 cubic feet of contaminated material from the primary retention pond, core samples were obtained in October 1987 from the bottom and sides of the pond.
A sample was taken from each core at six (6) inch intervals and analyzed for alpha activity.
Results of these analyses are shown in the attached table.
Soil from areas of the primary pond that had contamination levels above 250 picocuries per gram remaining after the previous years' decontamination effort was removed to reduce residual contamination to below this level. A solubility test was conducted on a composite sample of the removed material. The test showed the uranium present in the sample to have approximately the same solubility as calcium diuranate, which is considered insoluble.
Water present in the primary pond, sampled after removing the cover that was present during your visit, has now decreased to 33% of MoC for alpha activity (U-234) and 4% of MPC for beta activity (Tc-99).
This is a significant decrease from the levels present in previous years, indicating that the decontamination effort was largely effective.
About 1200 cubic feet of soil and rock was also removed from the secondary retention pond during 1987. As shown in the attached
- ule, some areas are still above the target contamination level and require removal of additional material.
Also attached is a summary of continuous high-volt.me air sampling conducted above the spent limestonc piles.
The results, shown in the attached table, include natural back round from ambient dust loading and 3
any contribution from normal operating stack em%sions, 8806070172 880520 ADOCK 070 6
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Power Systems Post Offce Box 107 (314) 937-4691 Combustion Engineenng, Inc.
Highway P (314) 296-5640 Hematite, Missouri 63047 g
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d-George Bidinger.
May 20,~1988 U.S.N.R.C.
Page~2-Now that the air sampling has been completed, we will sample the spent limestone piles _in accordance with the sampling plan required by Condition.18.to License SNM-33, which was previously submitted and approved. The results of this sampling will.be sent to you when analyses are: completed.
We also plan to take additional samples of the primary pond this year and will send an updated contamination level mapping when this is completed.
Cordially, COMBUSTION ENGINEERING,1NC.
^
H.E. Eskridge, Supervisor Nuclear Licensing, Safety and Accountability HEE / sly NIS/88/6018 Attachments e
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PRIMARY RETENTION POND CORE SAMPLES 1
i No (North), So (South), Ea (East), We (West), Avg. (Average)
PCi Uranium /Gm Soil Depth Bottom Side Inches No So Ea We Ava.
No So Ea We Avo.
6 87 86 123 101 99 81 62 54 674 218 12 71 87 37 89 71
._76 55 21 106 65-18 60 77 30 76 61 73 35 24 66 50 24 43 68 31 87 57 85 35 35 72 57 30 25 98 24 87 59 64 37 32 38 43 36 35 102 14 79 58 57 37 35 72 50 42 26 42 18 70 39 16 34 38 56 36
.._ 4 8 22 20 14 74 33 29 38 38 65 43 54 24 9
6 86 31 38 26 46 37 60 9
2 3
95 27 l
29 38 53 40 54 65 Assume West 6" and 12" samples were contaminated and use avg. of No, So, &
Ea for We value.
6" - 66 PC1/gm i
12" - 51 PCi/gm Overall Avg. is then 47 PCi/gm.
1/2 gm samples of bottom cores composited, mixed & 1/2 gm sample taken and counted - 70 PCi/gm Composite - 48 PCi/gm
SECONDARY RETENTION POND
=
SURFACE SOIL SAMPLES PCi/Gm 205 81 249 217 251 13 262 55 57 338 220 133 229 78 72 468 361 277 304 56 307 370 251 356 103 213 339 173 316 292 291 164 354 84 208 432 357 209 344 136 93 448 181 188 121 378 745 198 321 121 369 233 329 229 114 229 200 41 39 676 74 58 277 88 154 90 35 46 184 181 34 46 198 34 50 72 51 102 173 47 19 191 146 49 311 100 51 81 61 77 188 218 69 211 189 109 153 118 131 176 139 146 393 302 294 264 63 35 145 138 71 124 76 382 145 208 86 131 56 180 133 58 116 129 30 21
]
142 38 105 108 27 190 98 41 179 35 61 39 129 32 111 34 291 38 97 75 54 176 250 605 a
1019.1 Samples taken 09-11-87 on a 3 foot grid after 1170 ft3 (13 tote boxes) of soil and rock were removed, i
QUARTERLY COMPOSITE AIR SAMPLING AB0VE LIMESTONE PILES Concentration (x10-15pCi/ml)
Inside Fence Eq11
}[qs1 1985 July - September 4.7 2.6 8.3 October - December 7.8 3.9 2.7 1986 January - March 1.6 1.8 2.0 April - June 1.2 1.0 July - September 9.5 6.0 5.6 October - December _
8.8 7.6 5.8 1987 January - March 6.5 3.3 4.4 April - June 5.8 4.0 2.0 July - September 3.1 2.8 2.4 October - December 6.6 4.4 3.8
- Sampler Down Continuous air sampling was conducted at the center of, and approximately 1 meter above, the uncovered spent limestone piles. The weekly samples were composited and analyzed for Uranium activity on a quarterly basis.
The lower limit of
-16 detection was less than 10 Ci/ml.
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