ML20210B275
| ML20210B275 | |
| Person / Time | |
|---|---|
| Site: | U.S. Geological Survey |
| Issue date: | 03/18/1987 |
| From: | Rusling D INTERIOR, DEPT. OF, GEOLOGICAL SURVEY |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML20210B248 | List: |
| References | |
| CAL-87-05, CAL-87-5, NUDOCS 8705050277 | |
| Download: ML20210B275 (1) | |
Text
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CU 77-os-United States Department of the Interior i
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GEOL OGICAl. St *p24 VEY llOX 25016
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i 41 I)ENVER FEI)ERAl. CENTER 1
l I)ENVER, Col.ORAI)O 80223 March 18, 1987 n.m.......
Reactor License:R-113 Docket No.
50-274 Administrator
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U.S. Nuclear Regulatory Commission
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.T Region IV I'
611 Ryan Plaza Drive Suite 1000 iij l MAR 231981 j
Arlingto'n, Texas 76011 4:
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Dear Sir:
i This letter is to notify you that we have found some holes in the aluminum l
reactor tank liner that have penetrated the k" aluminum liner. Our reactor is a TRIGA Mark I with the tank below ground level.
The tank is surrounded 4
j with four feet of concrete.
We have not been able to determine a leak rate. Annual water loss due to evaporation and possible leakage has not shown a trend. Our loss rate has l
been approximately 4000 gallons per year. Over the past six years, the maximum difference between the lowest and highest usage is about 500 gallons, j
but there is no trend shown.
The variations each year are cyclical.
4 l
The radiation levels in the reactor water are low.
The most recent analyses
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show a gross < concentration of 4.4 X 10-9 pC1/ml, and a gross ( concentration of 4.8 X 10-8 pCi/ml. H3 concentrations have had a stable history of abouc 1
l 9 X 10-5 pCi/ml.
We do not believe there is an immediate safety problem. We have suspended l
routine operations while we seek to determine the extent of the problem and a feasible solution.
We will conduct cperations that are needed to satisfy surveillance requirements of our Tech Specs.
i We will notify you of actions we propose to take to correct the problem prior to resuming routine operations.
This matter was discussed by telephone with Mr. Ron Baer of Region IV, and 4
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Mr. Bob Carter of NRR on March 18, 1987.
Sincerely, l
Qk((
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Donald H. Rusling i
Reactor Supervisor F
l cc: Document Control Desk (2)
Mr. Robert Carter l
Standardization and Special Projects Directorate Division of PWR Licensing - B I
Office of Nuclear Reactor Regulation 614G b
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