ML19263D926
| ML19263D926 | |
| Person / Time | |
|---|---|
| Site: | 07000025 |
| Issue date: | 03/22/1979 |
| From: | Remley M ROCKWELL INTERNATIONAL CORP. |
| To: | Rouse L NRC OFFICE OF NUCLEAR MATERIAL SAFETY & SAFEGUARDS (NMSS) |
| References | |
| 79ESG-2663, NUDOCS 7904170065 | |
| Download: ML19263D926 (4) | |
Text
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- 4 Energy Systems Group
'9 8900 De Soto Avenua i
Canoga Park. CA 91304
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March 22, 1979 In reply ~ refer to 79fSG-2663
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s Mr. Leland C. Rouse, Chief
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Fuel Processing & Fabrication Branch
'a G ' 7!9 Division of Fuel Cycle and Material Safety U.S. Nuclear Regulatory Commission g'
n Washington, D.C.
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Dear Mr. Rouse:
Condition 42 to our Special Nuclear Materials License Stim-21, as amended in your letter of March 29, 1978, imposes a requirement for sampling retention pond water at Santa Susana and sewage outflow at De Soto and analyzing these samples for tritium.
This condition stipulates that if the maximum concentration determined in a 12-month period is 55% of the applicable limits specified in 10 CFR 20, sampling may be discontinued.
The applicable limits are 1 x 10-3 Ci/ml for the De Soto release to the sewer and 3 x 10-3 Ci/ml for the S nta Susana retention pond.
Five percent of these limits are 5 x 10-Ci/ml or 11,100 dpm/ml and 1.5 x 10 4 ;tCi/ml or 333 dpm/ml for the De Soto and Santa Susana sites, respectively.
Daily samples have been taken from the De Soto sewage outfall, com-posited, and analyzed monthly, as required by Condition 42, starting in December 1977. Similarly, samples of the Santa Susana retention pond were taken prior to release and analyzed.
The analyses were done by the U.S. Testing Company, Richland, Washington, with a stated detection limit for tritium in water of 25 dpm/al, well below the lower of the two action levels of 333 dpm/ml.
A summary of the results of these analyses is presented as an enclosure to this letter.
You will note that over the period of time covered by this sampling (14 months at De Soto and 15 months at Santa Susana), the maximum counting rates observed (13.9 dpm/ml at De Soto and 22.2 dpm/ml at Santa Susana) not only were much less than 5% of the applicable limits specified in 10 CFR 20, but also were less than the statistically significant counting rate for detection of tritium in water.
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March 22, 1979 Page 2 Therefore, in compliance with Condition 42, we are discontinuing the sampling and analysis for tritium. Our inventory of tritium and the operations involving tritium have not changed significantly during this monitoring period and do not justify continuance of this surveillance.
Sincerel ou 4
M.
eml'ey, Director Health, Safety & Radiation Services Energy Systems Group abg:4/5-6 Enclosures
Enclosure 79ESG-2663 l
SUMMARY
OF ANALYTICAL RESULTS FOR TRITIUM IN WATER Santa Susana Site
- dpm/ml Ci/ml November 11, 1977 7.8 3.5 x 10-6
-5 December 2, 1977 22.2 1.0 x 10
-6 January 5, 1978 10.6 4.8 x 10
-6 January 16 12.2 5.5 x 10
-6 February 6 15.8 7.1 x 10 February 16 8.3 3.7 x 10-6
-6 February 21 13.7 6.2 x 10 March 1 2.5 1.1 x 10-6 March 10 0
0
-6 March 22 3.0 1.4 x 10 March 30 7.7 3.5 x 10-6
-6 April 7 3.4 1.5 x 10
-6 April 19 4.2 1.9 x 10
-6 September 7 1.3 5.9 x 10 November 13 0
0
-6 November 22 9.1 4.1 x 10 December 18, 1978 10.9 4.9 x 10-6 January 5, 1979 0
0 January 15 0
0 January 31 0
0
- 0omestic water supply in December 1977 showed 3.1 dpm/ml tri tium. Major source of water for this pond is rainfall runoff.
Enclosure 79ESG-2663 l
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SUMMARY
OF ANALYTICAL RESULTS FOR TRITIUM IN WATER De Soto Site
- dpm/ml pCi/ml December 1977 10.2 4.6 x 10-6 January 1978 6.7 3.0 x 10-0 February 2.5 1.1 x 10-6 March 0
0 April 0
0 May 7.3 3.3 x 10-6 June 0
0 July 3.7 1.7 x 10-6 August
?.8 1.3 x 10-6 September 0
0 October 13.9 6.3 x 10-6 November 0
0 December 1978 0
0 January 1979 3.3 1.5 x 10-6 rDomestic water supply in January 1978 showed 7 dpm/ml tritium 2
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