ML19242A364

Forwards Dames & Moore 790423 Ltr Documenting Telcons W/Usgs Re non-subsidence Potential of Cretaceous Sandstone

ML19242A364
Person / Time
Site:	Comanche Peak
Issue date:	07/27/1979
From:	Feist C TEXAS UTILITIES SERVICES, INC.
To:	Burwell S Office of Nuclear Reactor Regulation
References
TXX-3020, NUDOCS 7908010490
Download: ML19242A364 (5)

Text

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Log # TXX-3020 File 10010 TEXAS UTILITIES SERVICES INC.

2001 H14Y A N TOW Eft . D ALLAN. TEX AN 7520t July 27, 1979

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Light Water Reactors Branch No. 2 Division of Project Management Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Comission Washington, D.C. 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION GEOLOGIC INFORMATION NRC QUESTIONS 361.17 AND 361.25 C0CKET NOS. 50-445 AND 50-446 Dear Mr. Burwell.

A copy of the Dames & Moore letter dated April 23, 1979, which ,

documents telephone conversations with the U. S. Geological Survey regarding the non-subsidence potential of the Cretaceous sandstone, is attached.

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' Job No. 4486-028-12 Texas Ucilities Generating Company 2001 Bryan Tower Dallas, Texas 75201 Attention: Mr. Robert W. Caudle Project Manager - Nuclear Plants Gentlemen:

FSAR Question 361.4 Subsidence Potential in Cretaceous Sandstone Comanche Peak Steam ElectrL Station For Texas Utilities Generat .tg Comoany In Question 361.4, the NRC asked us to provide copies of the communi-cations with A. Winslow and J. Montgomery of the U.S. Geological Survey re-garding the non-subsidence potential of Cretaceous sandstone (FSAR p.2.5.38).

The appropriate portion of the FSAR text is quoted below:

" Sedimentary strata under the site are indurated or semi-indurated.

The semi-indurated strata are co= posed of poorly graded granular materials which are not subject to change in volume upon dewatering.

The United States Geological Survey in Austin, Texas, reports that subsidence of Cretaceous sandstones in the site vicinity has never been observed and is highly unlikely to ever occur (Al Winslew, personal co=munication). The United States Geolegical Survey in Forth Worth, Texas, also has no knowledge of subsidence in Cretaceous sandstone in the site vicinity (John Montgomery, personal co=muni-cation)."

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e D A ?d 3 S S /si co ;2 5 Texas Utilities Generating Company April 23, 1979 Page Two Dames & Moore was unable to find the original telec.o=munications (circa 1970). On April 19, 1979 we called Mr. A. Winslow and Mr. J. Montgomery to ascertain if what was said in the FSAR are still valid. Their responses are summarized below:

1) Mr. Allen G. Winslow U.S. Water Resources Division Federal Building 300 E. Eight Street Austin, Texas 78701 (512)397-5766 Af ter providing Mr. Winslow with the background information and reading the above portion of the FSAR, he said that to his knowledge there was no evidence of subsidence related to ground water withdrawal in the 2retaceous sandstones. Furthermore, based on his knowledge of the geology and hydrology of these strata he would not expect any. These strata have experienced heavy ground water withdrawal in the Dallas-Forth Worth area with no reported adverse effects. He added that the aquifers are deeper in that area than in the vicinity of CPSES. Mr. Winslow concluded that he thought what was stated in the FSAR was still valid.

2) Mr. John Montgomery Retired from USGS Presently with Freese and Nichols 811 Lamar Forth Worth, Texas 76102 (817)336-7161 Af ter providing Mr. Montgomery with the background information, he said that he vaguely remembers the discussion. He added that he is a hydro-logist and at the time he had checked with Mr. Winslow who is a geologist /

hydrologist before making a statement. Any statement Mr. Montgomery made would have echoed Mr. Winslow',s.

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C Aht 2S 3 Moons Texas Utilities Generating Company April 23, 1979 Page Three Should you have any questions concerning these telecommunications, please contact us.

Yours very truly, DAMES & MOORE zla /0 /ht"' ,/d .

Eric McHuron Project Geologist EJM:ge (Three copies submitted) cc: Mr, Charles Oliver - DSM - HS Mr. Allen Winslow - USGS Mr. John Montgomery - Freese & Nichols 485 282