ML20046D218
| ML20046D218 | |
| Person / Time | |
|---|---|
| Site: | General Atomics |
| Issue date: | 08/10/1993 |
| From: | Asmussen K GENERAL ATOMICS (FORMERLY GA TECHNOLOGIES, INC./GENER |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 67-2110, NUDOCS 9308160352 | |
| Download: ML20046D218 (6) | |
Text
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F AX: (6191455 3865 l
August 10 199."
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67-2110 i
Document Control Desk U. S. Nuclear Regulatory Commission j
Washington D C. 20555
Subject:
Docket No. 50-163; Reactor Facility License No. R-67: Detection of Trace -
j Levels ofFission Product Activity from Tramp Uranium - Update No. 2 j
References:
- 1. K, E. Asmussen, Letter No. 67-1997 to U. S. Nuclear Regulatory l
Commission, Document Control Desk,' dated December 9,1992.
- 2. K. E. Asmussen, Letter No. 67-2023 to U. S. Nuclear Regulatory
?
Commission, Document Control Desk, dated February 9,1993.
Gentlemen:
[;
i In the letters referenced above, General Atomics (GA) had reported the detection of trace levels of fission product radionuclides in the reactor pool water and-air surrounding GA's~
l TRIGA Mark F reactor, and the results of ong'oing surveillance. :The' source of the activity that 'was being detected..was' believed to be from " tramp uranium," rather than damaged clad j
~
on one or more fuel elements. Reference 2 provided an update on surveillance' activities that-l were being carried out for a continual assessment of the levels of activity associated with this '
source of radionuclides. This second update. provides a summary of results of continued surveillance, which was carried out at decreased frequencies because of the continuously'-
decreasing levels of radioactivity that was being measured (Ref. 2).'
j d
Figures 1 through 4 (attached) show updated results of continued surveillance from the initial -
date of detection of the radionuclides. The plots entitled " Ratio of MPCs" refer to the ratio of i
the measured concentration to the appropriate MPC. The levels of the various fission product
'l radionuclides have continued to show a marked decrease in the levels detected, as is evident from the attached activity plots. To that end, GA instituted a further reduced frequency of sampling fbr the purpose of n easuring the fission product radionuclides. ' Air activity is now:
being measured on a monthly basis, and the fission product activity in the reactor pool water ~
on a quarterly basis The radionuclides ofinterest are at near zero concentrations, as can be i
seen from the activity plots.: The real time continuous' air monitor (CAM) count rate-indication in the reactor control roo~m is also at normal levels.' Any future potential increase in ~
~
activity can readily ;be ' detected from^ this CAM indication, at which time an-increased.
frequency of sampling. for' specific fission product activity 'can be: instituted if considered q
necessary by the Physicist-in-Charge.'
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l 3550 GENE RAL A10MICS COURT. SAN DitGO, CA 9212i1194
' PO BOX B5608. SAN DIEGO. CA 92186-9784 16191455 3000 U
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L U. S. Nuclear Regulatory Commission -
" August 10,1993 Rage 2 GA will apprise the NRC of any notable changes in the levels of fission product activity from -
the tramp uranium, detected as a result of our surveillance activity.
If you have any questions concerning this matter, please contact Dr. Junaid Rarvi at (619) 455-2441, or the undersigned at (619) 455-2823.
Very truly yours, Keith E. Asmussen, Director Licensing, Safety and Nuclear Compliance
/jr
Enclosures:
Figures 1-4 cc:
Mr. Alexander Adams, Jr., Sr. Project Manager Non-Power Reactors & Decommissioning Project Directorate Division of Operating Reactor Support Office of Nuclear Reactor Regulation Mr. Phillip 'Qualls, Reactor Inspector NRC Region V h
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6 FIGURE 1.
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FIGURE 2.
MARK F REACTOR ROOM ACTIVITY GOC k
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Rb = 3E-6
-m-Rb-89 Te-132 0
-x-Ba-139
-A-Sum of Ratios sa - 3E-s
FIGURE 3.
MARK F STACK ACTIVITY 0.12 A
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02-Jan 93 30 dan-93 27-Feb-93 21 Nov-92 19-Dec-92 16-Jan-93 13-Feb-93 13-Mar-93 DATE OF SAMPLE
-m-Rb-09 Te-132 O
Cs-138
-x-Ba-139 -
-A-Sum of Ratios
a MARK F PIT EAYER ACTIVITY GE A
ee
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'DATE OF SAMPLE
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.