ML19352A172

First Interim Deficiency Rept Re Lamination of Soil in ERCW Spray Pond,Initially Reported 810204.Laminations Possibly Caused by Overcompaction of Liner &/Or Excessive Speed of Hauling Equipment.Block Samples Will Be Evaluated

ML19352A172
Person / Time
Site:	Yellow Creek
Issue date:	03/05/1981
From:	Mills L TENNESSEE VALLEY AUTHORITY
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
References
10CFR-050.55E, 10CFR-50.55E, YCRD-50-566-81, NUDOCS 8103110584
Download: ML19352A172 (2)

Text

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400 Chestnut Street Tower II I March 5, 1981 \ #

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YCRD-50-566/81-03 8 g O: NAR &

Mr. James P. 'Reilly, Director

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Office of InspeAtion and Enforcement ,

U.S. Nuclear Regulatory Commission o)

Region II - Suite 00 /

101 Marietta Street W Atlanta, Georgia 303

Dear Mr. O'Reilly:

YELLOW CREEK NUCLEAR PLANT UNIT 1 - LAMINATION OF SOIL IN ERCW SPRAY POND -

YCRD-50-$66/81 FIRST INTERD4 REPORT The subject deficiency as initially reported to NBC-0IE Inspector R. W. Wright on February 4,1981, in accordance with 10 CFR 50.55(e) as NCR YC-144. Enclosed is our first interim report. We expect to submit our next report by August 11, 1981.

If you have any questions concerning this matter, please get in touch with D. L. Lambert at FTS 857-2581.

Very truly yours, TE!GESSEE VALLEY AUTHORITY I

l l L. M. Mills, Manager i

Nuclear Regulation and Safety l

Enclosure cc Mr. Victor Stello, Jr., Director (Enclosure), V [

Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission Washington, DC 20555 I

l foI4 5Ifl 81os11ogyf 7 '

O ENCLOSURE YELLOW CREEK NUCLEAR PLANT UNIT 1 LAMINATION OF SOIL IN ERCW SPRAY POND YCRD-50-566/81-03 FIRST INTERIM REPORT Description of Deficiency As part of TVA's construction testing, earthfill block samples are required to be taken from category I earthfill placement. Laminations in block samples have been observed in six out of seven samples taken from the west ERCW spray pond (unit 1). Most of the laminations occurred at a depth of one to three inches from the top of the block samples. Laminations in the earthfill liner in the west spray pond were possibly caused by overcompaction of the liner and/or excessive speed of hauling equipment.

Interim Progress TVA will evaluate the earthfill block samples to determine if the laminations will signi,ficantly affect seepage and/or the structural integrity of the west spray pond. TVA construction has been scarifying each completed earthfill layer before placing a new layer to achieve bond between-layers. Since nost of the block samples indicated laminations near '

~ the top of the upper layer and the samples were taken before scarifying, it

. is likely there will be less laminations in the actual fill. However, this

.needs to be confinmed -in the field. To achieve'this, additional block >

samples will be taken in the vicinity of the earlier block samples which indicated laminations. The samples and the walls of the pits which are excavated to obtain the samples will be inspected for laminations. If required, these pits will be' exten'ded horizontally and/or vertically to inspect the laminations. The samples with laminations will be tested for permeability, shear strength, soil classification, and density. The need for corrective action on the inplace earthfill will be evaluated on the basis of field obserystions and the laboratory test data.

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