ML20128K045
| ML20128K045 | |
| Person / Time | |
|---|---|
| Site: | General Atomics |
| Issue date: | 02/09/1993 |
| From: | Asmussen K GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 67-2023, NUDOCS 9302180054 | |
| Download: ML20128K045 (6) | |
Text
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4 ksamurm,monaes j
February 9,1993
. 2023 l
l Document Control Desk U.S. Nuclear Regulatory Commission Washington, D.C. 20555
Subject:
Docket No. 50-163; Reactor Facility License No.- R 67: Detection of Trace Levels of Fission Product Activity Update No; 1 q
Reference:
K. E. Asmussen letter No. 671997, " Detection of Trace levels of Fission Product-Activity," to U.S. Nuclear Regulatory Commission, Document Control Desk, dated r
December 9,1992 Gentlemen:
i In the referenced letter, General Atomics (GA) reported that it had detected trace levels of fission product radionuclides in the pit water and air surrounding GA's Mark F reactor. The levels detected were well below the maximum pennissible concentrations (MPCs) for unre-stricted areas. At that time, GA indicated that it had instituted a program of increased surveil-lance to monitor the levels of these radionuclides. Further, GA indicated ittwould make an
- i assessment of our surveillance plan or other appropriate actions following the restart of the 1
reactor after GA's December 1992 holiday shutdown. : Attached is a summary of the results of our surveillance to date, and our plans for future surveillance is given below.
[
Figures 1 through 4 (attached to this letter) show the results of our surveillance from the :
date the radionuclides were initially detected. Note that the plots titled;" Ratio of MPCs" refers to the ratio of the measured concentration to the appropriate MPC. From-the time of-the
~t referenced letter to the time the reactor'was shut down for ine holidays, the level of radio-nuclides appeared to have leveled off. The reactor was shutdown on the 23rd of December:19921 and restarted on the 5th of January 1993. Samples taken on the 4th of January 1993, prior to -
l plant start-up, showed no detectable levels of radionuclides in the pit water or air surrounding l
the reactor.
After start-up, trace levels of these radionuclides were again detected-in the water -
t followed by a sharp drop off. The air surrounding the Mark F reactor had much lower levels
- of trace radionuclides than prior to the shutdown. In addition, there are currently no detectable levels of radionuclides in the stack.-
c, As a result of these lower trace levels of radionuclides, GA has decreased the frequency of surveillance to only one sample a week.
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U.S. Nuclear Regulatory Connuission February 9,1993 67-2023 Page 2 OA will continue to appraise the NRC of the results of its surveillance; another update on the results will be submitted by letter in about three months.
If you have any questions concerning this letter, please contact Dr. Junaid Razvi at (619) 455-2441, or me at (619) 455-2823.
Very truly yours, Ys {,.
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Keith E. Asmussen, Director Licensing, Safety and Nuclear Compliance KEA:shs
Enclosures:
Figures 1-4 cc:
Mr. Alexander Adams, Jr., Senior Project Manager Non-Power Reactors and Decommissioning Project Directorate Division of Operating Reactor Support Office of Nuclear Reactor Regulation Mr. Phillip Qualls, NRC Region V.
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