ML20034A294

Provides Proposed Refinement to Essential Raw Cooling Water Action Plan,For Comments

ML20034A294
Person / Time
Site:	Sequoyah
Issue date:	04/13/1990
From:	Wallace E TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
NUDOCS 9004230004
Download: ML20034A294 (4)

Text

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TENNESSEE VALLEY AUTHORITY '

CH ATTANOOGA. TENNESSEE 37401 i

SN 157B Lookout Place APR 131990 i

U.S. Nuclear Regulatory Commission Washington, D.C.

20555-Attention:

Document Control Desk Gentlemen:

In the Matter of

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Docket Nos. 50-327.

Tennessee Valley Authority

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50-328 SEQUOYAH NUCLEAR PLANT (SQN) - ESSENTIAL-RAH COOLING HATER (ERCW) PUMPHOUSE.

FOUNDATION AND ERCH AWMPING STATION ACCESS CELLS'

References:

1.

TVA letter to NRC dated December 28,:1988, "Sequoyah Nuclear, Plant (SQN) - Essential Raw Cooling Water (ERCW) Pumphouse

• Foundation and ERCH Pumping Station Access Cells" 2.

TVA letter to NRC dated October 20, 1988, "Sequoyah Nuclear Plant (SQN) - Essential Raw Cooling Hater (ERCW) Pumphouse Foundation and ERCH Pumping Station Access Cells" This letter provides a proposed refinement to SQN's ERCH action plan. -The

-f changes have been discussed with Tom Cheng and Jack Donohew of your-staff..As a

required by TVA's Commitment 0 in Enclosure.1-of

Reference:

1, NRC's written concurrence with the proposed refinement is requested, The enclosure to this letter contains a' labelled sketch of the proposed hole T

locations in the ERCH pumphouse foundation.

A sketch of the original locations was provided as Figure A-1 in.the enclosure of Reference 2.

TVA proposes that two of the original holes in Element D be replaced with new Holes PSD-7 and PSD-8.

Hole PSD-7 will be located near the perimeter of the foundation cell in Element D.

This hole will be located between the original two outside holes (PSD-1 and PSD-2) proposed in the exploration plan. Hole PSD-8 will be positioned to intersect Hole 39 (1977 drilling) at.

4 Elevation 629.0.

The total number of holes drilled and grouted in Element D will remain at six.

These changes are to increase the effectiveness of the grouting on the perimeter of the cell and to intersect Hole 39 to' further verify that cavities do not exist.

In Element B, Hole PSB-1, the hole closest to the cell perlaieter, is scheduled a

to be drilled first.

If this hole indicates acceptable concrete, TVA proposes that the second hole originally planned in this element not be drilled.

It should also be noted that the second drill crew.has been transferred from this job to support an emergency investigation at Wilson Lock. -They will be.

-i available to assist the pumping station drilling on June 1,'1990, if.

i required.

No change in the September 1, 1990, completion date is anticipated.

l 9004230004 900413 PDR ADOCK 05000327 1

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I j An Equal Opportunity Employer '

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APR 131990:

U.S. Nuclear Regulatory Commission

-i There are no commitments contained in this submittal.

Please direct questions

-l concerning this issue to Kathy S. Whitaker at.(615) 843-7748.

Very truly yours, l

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TENNESSEE' VALLEY AUTHORITY l-I

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E. G. H lace, Man r

Nuclear Licensing and

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-Regulatory Affairs 1

Enclosure cc: Ms. S.-C. Black, Assistant Director-(Enclosure)-

for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockvil_le Pike Rockville, Maryland 20852 NRC Resident Inspector (Enclosure) 4 Sequoyah Nuclear Pl_ ant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 Mr. B. A. Wilson, Assistant Director (Enclosure) for Inspection Programs TVA Projects Division U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 l

Atlanta, Georgia 30323 t

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I ENCLOSURE ESSENTIAL RAN COOLING HATER (ERCH)

PUMPHOUSE FOUNDATION SKETCH.

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92 doi ERCW POMPING STATION AT ELEVATION SSS

@ - PREVIOV". 'NVESTIGATION HOLE LOCATION-TYPICAL

+ - RECOMMt.WDED EXPLORATION HOLE LOCATION AT ELEVATION i

620'. 630' s

NOTE: HOLES MAY BE DRILLED AT AN ANGLE IN ORDER TO ACCOMMODATE ACCESSIBILITY AT ELEV 666*

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