ML19224D188
| ML19224D188 | |
| Person / Time | |
|---|---|
| Site: | 07001379 |
| Issue date: | 06/05/1979 |
| From: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | Wells C PARKWELL LABORATORIES, INC. |
| References | |
| NUDOCS 7907110056 | |
| Download: ML19224D188 (10) | |
Text
.
/ph MCu UNITEo STATES NUCLEAR REGULATORY COMMISSION f3 REGloN ill 799 ROOSEVELT RC AO e
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CLEN E LLYN. ILLINot5 60137
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JUN 5 1979 Parkwell Laboratories, License No. S.01-1347 Incorporated ATTN:
Mr. Charles E. Wells 429 North High Street Croton, OH 43013 Gentlemen:
This refers to :.he confirmatory radiation measurements performed at your facility on May 1 through 4, 1979, by Ms. F. A. Ferrell and Messrs. R. A. Paul and D. J. Sreniawski of the Nuclear Regulatory Commission, Region III (NRC-RIII). The measurements consisted of:
direct surveys for maximum and average contamination levels; smear surveys for removable contamination, an air sample, soil and water samples from the sanitary drain outlet pipe, and verification of the response of your radiation instrumentation.
The direct and smear surf ace measurements for alpha contamination 2 level for (Appendix A) showed 31 areas exceeded the 300 dpm/100 cm 2
maximum contamination and nine areas exceeded the 20 dpm/100 cm level for removable contamination. These limits are for transuranic elements as listed in the " Guidelines For Decontamination of Facilities and Equipment Prior to Release For Unrestricted Use or Termination of Licenses For Byproduct, Source or Special Nuclear Material." A copy of these guidelines were included as Appendix A to our March 14, 1979, letter to you.
The air sample taken May 3, 1979, during the unwrapping and survey of the exhaust manifold showed 3.4 x 10-13 microcuries/=1 (Appendix C).
This level is below the Part 20, Appendix B Standards, Table 1, Columu 1 of the Code of Federal Regulations.
The sampler, taker; from the sanitary drain outlet were less than 10-6 microcuriet per milliliter alpha and less than 6 x 10-5 microcuries per milliliter beta-g e for water. The soil samples were less than 10-6 microcuries per gram alpha and 6 x 10-5 microcuries per gram beta-ga==a (Appendix D).
These values are equal to our background readings for field surveys, 0) t M W7 ul'l5[
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Parkwell Laboratories, JUN 5 1979 Incorporated The verification of your calibration of radiation instrumentation showed your Th-230 source to have a nominal value of 3.75 x 10-3 microcuries (8250 dpm) when compared to the NRC check source (Appendix E).
The NRC-RIII confirmatory measurements show your facility requires additional decontamination.
We will gladly discuss any questions you have concerning these measurements.
Sincerely, UJames G. Keppler Director Attachments: as stated cc w/ attachments:
Central Files Reproduction Unit NRC 20b PDR NSIC
})O
Appendix A Page 1 of 2 DIRECT AND SMEAR SURFACE MEASUREMENTS Map Direct Survey Smears 2
Location Description of Area Surveyed Alpha dom /61 cm2 Alpha dom /100 cm2 Alpha dpm/100 cm 1
No survey made - box disposed of as active waste 2
Small wooden shelf 400 660 9
3 Top of 55 gallon drum NAD 4
4 On electrical box 500 820 6
5 Floor under engine 200 330 5
6 General floor area along concrete edge 400 to 1200 660 to 2000 2
7 Electrical panel 1000 1600 1
8 Table top 500 to 600 820 to 980 5
9 Electical panel 1000 1600 4
10 Floor under balance table 2400 to 3000 3900 to 4900 134 11 Shelf under balance table 20,000 33,000 33 12 General floor area NAD to 8000 13,000 21 13 Vacuum pump base under table 5000 8200 155 14 llorizontal table support NAD 15 15 Floor under glove box 400 660 4
16 General floor area NAD to 1200 980 19 17 Floor under glove box NAD 4
18 Inside of exhaust duct vent in glove box 200 330 25 19 110 volt recaptacle box 1300 3000 1
20 110 volt receptacle box NAD 1
21 On wooden ladder (7 ft.) steps 3000 8200 2894 22a Floor in corner 8000 13000 2117 23 Inside glove box:
floor NAD 14 wall 200 to 400 330 to 660 I
seam at front 2000 to 3000 3300 to 4900 e.o data 24 Inside glove box:
floor 200 to 600 330 to 980 1
t;-s wall 500 820 13 tja seam at front 4000 6660 na data CE) 25 llorizontal bar on bench NAD 12 r- )
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Appendix A Page 2 of 2 DIRECT AND SMEAR SURFACE MEASUREMENTS Map Direct Survey Smears 2
2 2
1.ocation Description of Area Surveyed Alpha dpm/61 cm Alpha dpm/ LOO cm Alpha de.a/100 cm 26 Steps of two foot wooden ladder NAD 1
27 Top of power supply NAD 1
28 Floor in washroom NAD 4
29 Spot on floor - approximately I sq. ft.
1200 2000 6
30 General floor NAD 1
31 Spot on desk top - approximately 1 sq. ft.
1000 1600 1
32 Floor in office NAD 2
33 Floor in main room NAD 3
34 Floor in front of glove box 200 te 20uu 330 to 2000 5
35 Inside squirrel cage of fan NAD 4
36a Inside duct where it joins 'auilding NAD 37 Bottom of mop hucket 1400 to 5000 2300 to 8200 10 13 Shelf on wall 13000 21000 15 38 Spot on floor (reading 5 mrad /hr open window, 100,000 160 000 4
<0.1 mrad /hr thru probe side) -
approximately I sq. ft.
39 Shelf on wall NAD 40 Inside grove box - hole for vent 4000 6600 31 41 Top plate of pellet press 6000 9800 69 42 llole in wall (edges). This area was cut out
> 200,000
> 330,000 no data and section place in active waste Roof NAD 1
Roof NAD 1
Roof NAD 7
L/J Light fixture - Room 7 NAD 2
LN I,1 gh t fixture - Room H NAD 2
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Appendix B Page 1 of 2
~ EXHAUST MANIFOLD SURVEY Alpha Survey of Exhaust Manifold Pieces (47 Sections, each approximately 1 sq. ft.)
Section No.
Results i
(uC1/100 cc )
1 0.33 x 10-3 2
0.33 x 10-3 3
0.33 x 10-3 4
0.33 x 10-3 5
0.33 x 10-3 6
0.82 x 10-3 7
0.33 x 10-3 8
41.0 x 10-3 9
82.0 x 10-3 10 40.0 x 10 3 11 0.33 x 10-3 12 8.2 x 10-3 13 0.33 x 10-3 14 0.82 x 10-3 15 0.25 x 10-3 16 57.0 x 10-3 17 90.0 x 10-3 18 57.0 x 10-3 19 J7.0 x 10-3 20 49.0 x 10-3 21 82.0 x 10-3 22 49.0 x 10-3 23 82.0 x 10-3 24 57.0 x 10-3 25 164.0 x 10-3 26 82.0 x 10-3 27 24.0 x 10-3 28 98.0 x 10-3 29 2.5 x 10-3 30 33.0 x 10-3 31 40.0 x 10-3 32 1.6 x 10-3 33 1.5 x 10-3 34 11.5 x 10-3 35 82.0 x 10-3 36 3.3 x 10 3 3,0 2 /i 1
Appendix B Page 2 of 2 Section No.
Results 37 6.5 x 10-3 38 14.7 x 10-3 39 57.0 x 10-3 40 66.0 x 10-3 41 24.0 x 10-3 42 0.96 x 10-3 43 16.0 x 10-3 44 0.32 x 10-3 45 0.32 x 10-3 46 33.0 x 10-3 47 0.32 x 10-3 TOTAL = 1518 x 10-3 pC1/100 cm2
= 1.52 pCi/100 cm2 1.52 '
930 14.1 pCi total activity on
=
exhaust manifold, with the conservative assumption that the maximum activity per section, as listed above, was equal to the average activity per section.
330 242
Appendix C AIR SAMPLE Air Sample Date T35 a:
May 3, 1979 Tine: 0950 to 1029 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.915345e-4 months <br /> (30 minutes)
Ficw Rate:
20 cfm De;cription: Taken in glove box Room 7 while exhaust manifold pieces were unwrapped and surveyed.
Count of Air Sample at 0950 hours0.011 days <br />0.264 hours <br />0.00157 weeks <br />3.61475e-4 months <br /> on May 4,1979: Trial 1 - 4c/2 min.
Trial 2 - 18c/2 min.
Councer BKGD - 8c/10 min.
Counter Yield - 0.37 cpm /dpm
- 0.8c/ min 4c/2 min + 18c/2 min. = 5.5 cpm 2
Activity = (5.5 cmp - 0.8 cpm BKGD) x 1 dpm x 1 uCi
= 5.77 x 10 6 pc 6
0.37 cpm 2.2 x 10 dpm 4
7 Volume sampled - 20 x 2.83 x 10 ml x 30 min. run = 1.70 x 10 al f3 5.77 x 10-6 pCi 3.4 x 10-13 pCi/ml Concentration = Activity
=
=
Volume 1.70 x 107 ml Comparing this concentration with Part 20, Appendix B Standards, Table 1, Column 1 Isotope Standard Percentace Soluable Am 241 6 x 10-12 pCi/ml 6%
Insoluable Am 241 1 x 10-10 uCi/ml
<1%
Soluable Pu 238 2 x 10-12 pCi/ml 17%
Insoluable Pu 238 3 x 10-11 uCi/ml 1%
Soluable Pu 239 2 x 10-12 uC1/ml 17%
Insoluable Pi 239 4 x 10-11 uCi/ml 1%
330 243
Appendix D SOIL AND WATER SAMPLES Soil and water samples from the sanitary drain outlet point were collected on a planchet, evaporated to dryness and counted in the h'RC scaler.
Sample a dpm By dpm Water #1 BKGD BKGD Water #2 BKGD BKGD Soil #1 BKGD BKGD Soil #2 BKGD BKGD 3.6 to 9.8 x 10-7 pCi % 10-6 a instrument BKGD = 0.3 to 0.8 c/m
=
4.2 to 5.7 x 10-5 pC1 % 6 x 10-5 Sy instrument BKGD = 24 to 32.5 c/m
=
330-0 l} i*
c.
..i -
Appendix E DETERMIN1NG NOMINAL ACTIVITY OF LICENSEE'S CALIBRATION SOURCE 1.
NRC Th-230 source (13,200 dpm,6 x 10-3 uC1) = 7074 c/100 sec. on licensee's scaler Licensee's Th-230 source
= 4324 c/100 sec. on licensee's scaler Lic.
4324 0.61
=
h1C 7074 Lic. = 13,200 dpm x 0.61 - 8052 dpm or 6 x 10-3 pCi x 0.61 = 3.7 x 10-3 pCi nominal activity of licensee's source.
7815 c/100 sec. on NRC scaler 2.
NRC S -230 (13,200 dpm)
=
Licensee's Th-230 4983 c/120 sec. (5026 on NRC scaler
=
Lic.
4983 0.64
=
NRC 7815 Lic. = 13,200 dpm x 0.64 = 8448 dpm
= 3.8 x 10 3 pCi nominal activity of licensee's source.
3.
NRC source CS-11 = 4 x 103 cpm License source CS-10 = 2.5 x 103 cpm 4
8.25 x 103 1.32 x 10 dpm x 2.5 4
6 x 10-3 uCi x 2.5 3.75 x 10-3 pCi nominal activity of
=
4 licensee's source.
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