ML19305B294
| ML19305B294 | |
| Person / Time | |
|---|---|
| Site: | Vallecitos File:GEH Hitachi icon.png |
| Issue date: | 03/17/1980 |
| From: | Darmitzel R GENERAL ELECTRIC CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8003190469 | |
| Download: ML19305B294 (2) | |
Text
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,s GENER AL h ELECTRIC
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- ENGINEERING GENERAL ELECTR'C COMPANY, P.O. BOX 460, PLEASANTON, CALIFORNIA 94566 D1 VISION l
l March.17 1980 3
Mr. Darrell G. Eisenhut, Acting Director Division of Operating Reactors l
Office of Nuclear Reactor Regulations U.S. Nuclear Regulatory Commission i
Washington, D.C.
20555 1
Dear Mr. Eisenhut:
SUBJECT:
Probability Analyses of Surface Rupture Offset Beneath Reactor Building General Electric Test Reactor - License TR-1-Docket 50-70 In relation to the additional probability analyses of surface rupture offset beneath the General Electric Test Reactor building, the NRC staff requested an additional calculation using a soil age of 40,000 years.
Effects of varying this parameter between 128,000 and 195,000 years were included in the analysis report forwarded to the NRC March 12, 1980.
Reference should be made to that report (Additional Probability Analyses of Surface Rupture Offset Beneath Reactor Building, General Electric Test Peactor) for definition of terms
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and for a more thorough description of the anal 4s.
Additional Analysis In order to observe the effect of an arbitrary variation in soil age data on the results, this one additional analysis was performed to calculate the annual probability of a surface rupture offset beneath the reactor building.
For this analysis the age of soil beneath the reactor building, t*, and the time period 4
for offsets on existing shears, t, were assumed to be equal to 40,000 years.
s In other words, the age of all the geologic materials encountered in trenches B-1 and B-2 was assurrad to be 40,000 years.
However, this value is believed to be unrealistically low because it neglects soil age data obtained from the recent trench excavations (Ref.1).
Using this value in place of the correspond-4 ing values used for the best estimate case, annual probability values of 1.7 x 10-5 and 1.5 x 10-5 were calculated for the Analytical Approaches 1 and 2 respectively.
It is believed that these results are unrealistically high and do not represent the geological conditions which exist at the GETR.
Very truly yours,
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R. W. Darmitzel, Manager m mR ig Irradiation Processing Operation Nuclear Engineering Division
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i Ref. 1:
Earth Sciences Associ ':es, " Geological Investigation, Phase 2, General Electric Test Reactor Site, Vallecitos, California",
Report to General Electric Co., Vallecitos, California, February 1979, i
8003190 &
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i,'4 AFFIRMATION The General Electric Company hereby submits the attached letter, subject
" Additional Probability Analysis of Surface Rupture Offset Beneath Reactor Building General Electric Test Reactor".
To the best of my knowledge and belief, the information contained therein is accurate.
wueuw.w.._ _
J OFFICIAL,'
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V!Mt?UA C. Carn *i n )'
R. W. Darmitzel, Manager mTAn pucuc - cAuroud, ?
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Irradiation Processing Operation 1 to:e ex;hes ytn n s
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Su itted and sworn before me this 17th day of March 1980.
un d basta
, Notary Public in and for the County of
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r Alameda, State of California.
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