ML20149E626
| ML20149E626 | |
| Person / Time | |
|---|---|
| Site: | 07000734 |
| Issue date: | 07/02/1997 |
| From: | Asmussen K GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER |
| To: | Gaskin C NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| Shared Package | |
| ML19317C505 | List: |
| References | |
| 696-2753, NUDOCS 9707180260 | |
| Download: ML20149E626 (5) | |
Text
. _ _. _
,k f CENERAL ATDhNCE.
f July 2,1997 696-2753 VIA OVERNIGHT EXPRESS SERVICE Mr. Charles E. Gaskin Licensing Section 1/ Licensing Branch Division of Fuel Cycle Safety and Safeguards, NMSS U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Docket No.70-734; SNM 696; Request for Release of "Non Impacted" GA Facilities and Surrounding Areas to Unrestricted Use and Their Deletion from License SunplementalInformation
Reference:
Asmussen, Keith E., letter No. 696-2717 to Mr. Charles E. Gaskin,
" Docket No. 70 734; SNM 696; Request for Release of "Non-Impacted" GA Facilities and Surrounding Areas to Unrestricted Use," dated April 30,1997.
Dear Mr. Gaskin:
General Atomics (GA) recently submitted a request (Reference) for the release of "non-impacted" GA facilities and associated surrounding land areas to unrestricted use. These non impacted land areas have never been used for work involving radioactive materials and they are isolated from areas where any activities involving radioactive material were conducted.
1 The non-impacted area on GA's Main Site was shown on the Figure 1 enclosed with the referenced request and which is also herein enclosed. It includes the following buildings k
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numbered: 1,7,13,14,15,19,29 and 29-2 and associated surrounding land areas. All of these buildings, except 19, house engineering and management offices. Building 7 also houses GA's cafeteria and conference rooms. Building 19 consists of change rooms and rest rooms located next to the swimming pool, t
The non impacted area located on GA's Sorrento Valley Site was shown on Figure 2 enclosed with the referenced request and is again enclosed herein. It consists of raw land on a hillside up-gradient of, and to the north, west and south of Buildings 37,39,41 and 42.
This land has never been used to store or use radioactive material and is, for the most part, unusable and inaccessible. The raw land is located between the fence surrounding GA's Buildings 37,39,41 and 42 and GA's property line as shown in Figure 2.
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Following your receipt of our request, discussions were held with you and Messrs, l
Chuck Hooker and can Chaney regardin the proximity of the non-impacted area on the f,
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Mr. Charl^O Gaskin, U.S. NRC July 2,1997 696-2753 Page 2 i
l Sorrento Valley site to adjacent radiation restricted areas. In particular, there were two issues.
l These were: 1) the lack of soil sampling and analysis along the boundary separating the non-l impacted area and the remainder of the Sorrento Valley site and 2) the close proximity of this l
boundary to GA's building no. 39 (a.k.a. building SV B). GA addressed these issues by: 1) conducting additional surveys along the boundary between the non-impacted area and the remainder of the site and 2) by moving the boundary nearest to building 39 further away to the north by about 45 feet. The re-defined boundary delineating the revised Sorrento Valley "non-impacted area" is shown on the enclosed Figure 2A.
Soil samples were collected near the perimeter of the "non-impacted" area approxi-l mately every 50 meters and in a few biased locations as shown in Figure 2A. A total of 21 soll l
samples were collected and analyzed by gamma spectroscopy. The results, which are shown in Table 1, are at or near normal background levels (See Table 2 for background values) and are well below previously approved soll release criteria for the GA site (i.e.,30 pCi/g for enriched uranium,35 pCl/g for depleted uranium and 10 pCi/g for thorium).
l Exposure rate meas irements were also taken along the perimeter of the "non-impacted" area. The approximate locations where measurements were taken are shown on Figure 2A. The measured values are summarized in Table 3. No elevated levels were l
observed. Ilowever, since activities are currently ongoing in some of the Sorrento Valley facilities ( Building 39,41 and 42 currently have radiation restricted areas), it would not be l
unusual to measure elevated radiation levels along the perimeter boundary attributable to those activities; but not due to contaminants in the soil.
In view of the above described supplemental information, GA requests that its license be amended to release to unrestricted use the "non impacted" areas as described above and as l
shown on the enclosed Figures I and 2A and to delete these areas from the license.
Since GA's state of California broad scope radioactive material license No. 0145 37 l
has similar language regarding the " authorized place of use," GA is (under separate cover) also requesting the state of California to issue a license amendment releasing these same "non-impacted" areas to unrestricted use and deleting them from license No. 0145-37.
If you have any questions regarding the above, please do not hesitate to contact me at (619) 455-2823, or Ms L. aura Gonzales at (619) 455-2758.
Very Truly Yours,
& ' ' f.
2 Dr. Keith E. Asmussen, Director Licensing, Safety and Nuclear Compliance
Enclosures:
Figures 1,2, and 2A; Tables 1,2, and 3 i
cc:
F. Wenslawski, U.S. NRC, Region IV, WCFO
l Mr. Charles G: skin, U.S. NRC July 2,1997 696-2753 Page 3 i
Table 1.
Gamma Spectroscopy Results of Soll Samples Collected Near the Perimeter of the "Non-impacted" Land Areas at GA's Sorrento Valley Site (Rao Floure 9A for Annrnvimata Ramnia i nentinna) l Radlonuclide Concentration (pCilg) - Note: Background not subtracted Sample ID
- Cs 2eTh 22e Ra Total Thorium 2aag assy j
(Th)
A rage of A erage of 22eTh + 232Th 92.77 kev peak 144 (185) kev peak 661.6 kev peak i
j Perimeter 1 ND 0.72 0.06 1.58 0.30 2.30 2.07
- 0.59 0.16 0.07 i
j Perimeter 2 ND 0.98 0.10 1.87 0.43 2.85 2.21
- 0.63 0.19 0.08 l
Perimeter 3 ND 1.01 0.11 1.74 0.37 2.75 2.01 0.67 0.17 i 0.08
)
Perimeter 4 ND 0.81 0.09 1.54
- 0.32 2.35 1,47 0.49 0.16
- 0.06 i
Perimeter 5 ND 0.99 0.10 1.36 0.23 2.35 1.80 0.47 0.17 0.06 Perimeter 6 ND 0.79 0.10 1.3410.31 2.13 1.23
- 0.49 0.16 0.09 Perimeter 7 0.0810.05 0.67 i 0.13 1.30 0.25 1.97 1.57
- 0.53 0.11
- 0.06 l
Perimeter 8 0.0910.05 1.19
- 0.11 2.05 0.38 3.24 2.13 0.58 0.16 0.07 Perimeter 9 ND 1.35 0.12 2.44 0.37 3.79 2.21 0.65 0.21
- 0.09 l
Perimeter 10 ND 1.27 0.11 1.99
- 0.37 3.26 2.12 0.55 0.26
- 0.08 Perimeter 11 ND 1.09 0.09 1.92 0.37 3.01 1.7910.51 0.1410.06 Perimeter 12 0.4010.09 1.17 0.10 2.06 0.48 3.23 2.29 0.70 0.18 0.08 Perimeter 13 0.0710.05 0.04 0.08 1.81 0.34 2.65 1.44
- 0.47 0.14 0.07 j
Perimeter 14 0.2910.07 0.77 0.14 1.59 0.34 2.36 1.17 0.68 0.11 0.07 Perimeter 15 0.07 i 0.05 0.93 0.11 1.62 0.31 2.55 1.45 0.51 0.14 0.07 Perimeter 16 0.0710.05 0.96 0.11 1.53
- 0.40 2.49 2.28
- 0.64 0.17
- 0.08 Perimeter 17 ND 0.80 0.09 1.4 0.33 2.20 2.08 0.72 0.13 0.07 i
Perimeter 18 ND 0.95 0.11 1.68
- 0.35 2.63 1.79
- 0.45 0.16 0.06 Perimeter 19 0.0810.08 0.88
- 0.11 1.60 0.33 2.48 1.81
- 0.55 0.12 0.06 Perimeter 20 ND 0.87 0.10 1.54
- 0.45 2.41 2.38
- 0.73 0.19
- 0.08 Perimeter 21 ND 1.19
- 0.09 1.94 + 0.38 3.13 2.49 t 0.66 0.19 + 0.07
Mr. ChIrl:s Giskin, U.S. NRC July 2,1997 696-2753 Page 4 Table 2:
Background Radionuclide Concentrations (pCl/g) in Soil Sample Cs-137 Th-228 Ra-228 Total U-238 U-235 8
ID (Th-232)
Th-232 AJ ND 1.2820.07 1.47
- 0.14 2.75 1.98 0.31 0.15
- 0.03 G2 0.12 0.03 0.92 0.07 1.01
- 0.12 1.93 1.86 0.29 0.12.* 0.02 AC ND 1.29 0.07 1.34 0.14 2.63 2.27
- 0.27 0.20 0.03 BKG-1 ND 1.40 t 0.16 1.44 0.28 2.84 2.06
- 0.48 0.19
- 0.06 BKG-2 ND 1.54 0.15 1.57 i 0.27 3.11 2.30
- 0.45 0.17
- 0.05 BKG-3 ND 1.4020.14 1.62 0.26 3.02 ND 0.19 0.05 BKG-4 ND 0.67 0.09 0.84
- 0.17 1.51 1.15
- 0.37 0.0910.04 BKG-5 ND 1.51 0.16 1.79 0.31 3.30 2.77 0.67 0.12 0.06 BKG-6 ND 0.68
- 0.09 0.76 0.16 1.44 ND 0.08 0.03 BKG-7 ND 1.17
- 0.12 1.28 0.22 2.45 1.83 0.43 0.11 0.04 Mean i 2 a 1.19 i 0.64 1.31 0.68 2.5 1.32 2.03
- 0.93 0.14 0.09 Samples gamma scanned for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.
ND=
< 0.1 pCi/g for Cs-137, < 1.0 pCi/g for U-238 Samples collected in June and August 1993, typically about 1-2 miles from the Building 37 site at the following locations:
AJ Collected on a hillside west of Building 39 & northwest of building 37, ~3' from GA's fence.
G2 Collected about 1200 feet west of Bldg 1 (near T.P. RD.), and ~7/8 of a mile southwest of Building 37.
AC Collected about 1 mile southeast of the main site & about 2 miles southeast of Building 37.
BKG-1 Collected about 1 mile from Building 37 at the Scripps Hospital Entrance, east of Genesse Ave.
BKG-2 Collected about 1.2 miles from Building 37 at Sorrento Court Rd., by the Post Office entrance (North Side).
BKG-3 Collected about 1.5 miles from Building 37 at Sorrento Vista Parkway near Lusk Blvd. South.
l BKG 4 Collected about 1 mile west from Buildh q 37, west off Genesee corner of North Torrey Pines Road j
and Torrey Pines Scenic Drive l
BKG 5 Collected about 2 miles west of GA off s f a Jolla Shores Drive.
BKG-6 Collected about 2 miles northwest of Building 37 on North Torrey Pines Road BKG-7 Collected about 2 miles near V.A. Hospital on La Jolla Village Drive (southwest)
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Mr. Charle3 CO: kin, U.S. NRC July 2,1997 696-2753 Page5 l
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l Table 3:
Exposure Rate Measurements Collected st the Perimeter of the "Non-impacted" Land Areas at GA's Sorrento Valley Site ~
(see Figure 2A for Approximate Locations)~~ '
LOCATION EXPOSURE RATE (pR/hr)
P1 14 P2 14 P3 16 P4 14 P5 15 P6 12 P7 14 P8 15 P9 14 P10 14 P11 13 P12 13 P13 12 P14 12 P15 13 P16 12 P17 14 P18 12 P19 14 P20 12 P21 14
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