ML19309G225
| ML19309G225 | |
| Person / Time | |
|---|---|
| Site: | Vallecitos File:GEH Hitachi icon.png |
| Issue date: | 04/29/1980 |
| From: | Darmitzel R GENERAL ELECTRIC CO. |
| To: | Eisenhut D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8005050216 | |
| Download: ML19309G225 (7) | |
Text
L 80050 502 /G 'P GENER AL k ELECTRIC
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ENGINEERING GENERAL ELECTRIC COMPANY, P.O. BOX 460. PLEASANTON, CALIFORNIA 94566 D1V1SION April 29, 1980 Mr. Darrell G. Eisenhut, Director Division of Operating Reactors Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D.C.
20555
Subject:
Analysis of Slip Rate of Shear Surfaces at the General Electric Test Reactor (G' 3) Site - License TR Docket 50-70
Dear Mr. Eisenhut:
L An analysis of the slip rate of shear surfaces at the General Electric Test Reactor (GETR) site is attached.
This analysis was completed to determine the likelihood of an offset of a specified size. This report shows that the amount of offset which can be expected is on the order of 1.5 feet.
I Very truly yours, t
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R. W. Darmitzel, Manager
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I AFFIRMATION The General Electric Company hereby submits the attached report entitled
" Analysis of Slip Rate of Shear Surfaces at the General Electric Test Reactor (GETR) Site".
To the best of my knowledge and belief, the information contained therein is accurate.
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\\ SE31@h vmriffi cdscobno 5 R. W. Darmitzel, Manager
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1 Submitted and sworn before me this 29th day of April,1980.
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l I&bytatcvO berected
, Notary Public in and for the
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l' County of Alameda, State of California.
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ANALYSIS OF SLIP RATE OF SHEAR SURFACES AT GETR SITE The average rate of slip on the existing shears at the GETR site can be determined fron measurements of the amount and time interval of past o f fsets.
Given the average rate of slip and the age of last movement "
(8,000 years B.P.), the amount of strain buildup since the last offset up to the present time can be estimated for each shear.
The maximum measured displacements on each. shear since deposition of the Stage 5 paleosol (70,000-125,000 years ago) are sunnarized on Table 1.
From this table, the attached graphs indicating average rate of slip for each shear have been constructed. The highest rate of slip (and there-fore most conservative) derives from the assumption that the total displace-ment on each shear since deposition of the Stage 5 paleosol occurred in the time interval 70,000 to 8,000 years B.P.
A lower rate of slip is obtained if it is assumed that the edge of last movement is younger than 8,000 years or that part of the measured displacement occurred prior to 70,000 years ago, perhaps 80,000 or 100,000 years ago.
The total measured offset and average rate of slip are greatest on the B-1/
B-3 shear.
From the graph it can be seen that, given the maximum average rate of slip of 2 feet (0.6 meter) in 10,000 year, the accumulated strain since the last offset, 8,000 years B.P., is about 1.5 feet (.46 meter).
Thus, the amount of offset which can be expected on the B-1/B-3 in the near future is on the order of 1.5 feet or.5 meter.
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TABLE 1 MAXIMUM MEASURED DISPLACEMENTS (feet) 8,000-15,000 to 17,000-20,000 0 to 17,000-20,000 years to 8,000-15,000 years (Pre-Cambic Horizons 70,000-125,000 years (Post-Cambic Horizons of Modern Solum and (Pre-Stoneline and Total Displacement Shear of Modern Solum)
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