ML19316B121

Interim Deficiency Rept Re Nonconforming Backfill Matl Areas Around Unit 2 Power Block.Borings Into Structural Backfill Showed Unit 1 Area in Conformance.Four Areas within Unit 2 Found Potentially Below QC Criteria.Boring Diagram Encl

ML19316B121
Person / Time
Site:	South Texas
Issue date:	05/30/1980
From:	Eric Turner HOUSTON LIGHTING & POWER CO.
To:
References
ST-HL-AE-471, NUDOCS 8006110337
Download: ML19316B121 (5)

Text

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The Light Company nosm upw- m w700 nosmus77ooi m3msmn May 30,1980 ST-HL-AE-471 SFN: V-0530 Mr. W. C. Seidle, Chief Reactor Construction & Engineering Support Branch U.S. Nuclear Regulatory Commission ."

Office Of Inspection & Enforcement Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

Dear'Mr. Seidle:

South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Interim Report On The Possibly Reportable Deficiency Concernino Backfill Material On March 21, 1980, pursuant to 10CFR50.55(e), Houston Lighting and Power Company notified your office concerning certain non-conforming backfill material areas located around the South Texas Project Unit 2 power block. Provided for your information is a summary of the progress to date regarding this potential deficiency.

1. During the period of January 28 to February 8,1980, Woodward Clyde Consultants drilled twenty-one (21) borings into the structural backfill surrounding Units 1 & 2. Through the ini-tial field investigation, the structural backfill within the Unit 1 area was found to be in conformance with the backfill specification criteria. However, the field investigation also identified four (4) areas within the Unit 2 area where densities are potentially below the specified quality control criteria of 80% relative density, as interpreted from Standard Penetration Tests.

- Area 1 was identified by Woodward Clyde Consultants as an area West of the Unit 2 Reactor Containment Building near the tendon gallery main access shaft at a depth of about 70 feet (boring 204).

- Area 2 was identified by Woodward Clyde Consultants as an area Northwest of the Unit 2 Reactor Containment Building at a depth of about 34 feet (boring 205).

- Area 3 was identified by Woodward Clyde Consultants as an Bo/9 area East of the Unit 2 Mechanical Electrical Auxiliary S Building at a depth of about 30 feet (borings 208 and 209). j 80 0 6110 B7 y

• W*$ L M C*P3"1 May 30, 1980

• ST-HL-AE-471 ,

SFN: V-0530 Paa_e 2

- Area 4_ was identified by Woodward Clyde Consultants as an area West of the Unit 2 Fuel Handling Building (boring 203).

Figure 1 identifies the specific boring area investigated during the initial field investigation.

2. Subsequently, during the period of March 24 to April 11, 1980, a second field investigation was conducted by Woodward Clyde Con-sultants in order to determine more precisely the extent and characteristics of the four (4) potentially non-conforming areas previously identified. The second field investigation involved .

the drilling of twenty-eight additional borings. The sampling depths and intervals wi' thin the second field investigation were selected in order to provide better definition of the extent and properties of the non-conforming areas. The structural backfill was tested by Standard Penetration Testing starting at a depth of about 5 feet above the zone of interest and continued to a depth of about 5 feet below or until subgrade was encountered.

At this time, HL&P and Brown & Root, Inc. are currently reviewing the preliminary report submitted by Woodward Clyde Consultants detailing their second field investigation. An infonnational copy of this report has been previously given to the South Texas Project NRC Resident, Mr. S. Phillips.

3. The soil compaction test fill program has not been completed at this time due to adverse weather conditions at the South Texas Project site. The soil compaction test however is anticipated to be completed the middle part of June,1980.

4. As previously agreed to by HL&P, a meeting is scheduled for June 23, 1980 to present the findings and subsequent course of action regarding this potential deficiency. Following the June 23 meet-ing, a date will be established for the submittal of the next interim report. .

Questions concerning this matter should be directed to Mr. Shawn Rodgers at (713) 676-7953.

Very truly yours, l

E. A. Turner Vice-President Power Plant Construction &

Technical Services RRH/aks )

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Mtp.l ;htg i & M Caymy

.ST-HL-AE-Page cc: G. W. Oprea, Jr.

D. G. Barker C. L. McNeese H. R. Dean R. L. Waldrop G. B. Painter A. J. Granger R. A. Frazar M. D. Schwarz (Baker & Botts)

R. Gordon Gooch (Baker & Botts)

J. R. Newman (Lowenstein, Newman, Reis, Axelrad & Toll)

Director, Office of Inspection & Enforcement Nuclear Regulatory Commission Washington, D.C. 20555 M. L. Borchelt

• Executive Vice President .

Central Power & Light Company P. O. Box 2121 Corpus Christi, Texas 78403 R. L. Range Central Power & Light Company P. O. Box 2121 Corpus Christi, Texas 78403 R. L. Hancock Director of Electrical Utilities City of Austin P. O. Box 1088 Austin, Texas 78767 M. C. Nitcholas City of Austin P. O. Box 1088 Austin, Texas 78767 J. B. Pcston Assistant General Manager of Operations City Public Service Board .

P. O. Box 1771 San Antonio, Texas 78296 A. vonRosenberg  !

City Public Service Board P. O. Box 1771 San Antonio, Texas 78296 1

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Aoustb'0ghting & Pour company

, ST-HL-AE-Page .

Charles Bechoefer, Esqui t Chairman, AL;mic Safety & Li nsing Board U.S. Nuclear Regulatory Commission Washington, D.C. 205

Dr. James C. Lamb, III 313 Woodhaven Road Chapel Hill, North Carolina 21514 Dr. Emmeth A. Luebke Atomic Safety & Licensing Commission ,

U.S. Nuclear Regulatory Commission Washington, D.C.20555 Steven A. Sinkin, Esquire .

116 Villita Street -

San Antonio, Texas 78205 Citizens for Equitable Utilities c/o Ms. Peggy Buchorn Route 1, Box 432 Brazoria, Texas 77422 Richard W. Lowerre Esquire Assistant Attorney General for the State of Texas P. O. Box 12548 Capitol Station Austin, Texas 78711 Henry J. McGurren, Esquire Hearing Attorney Office of the Executive Legal Director U.S. Nuclear Regulatory Comn.ission Washington, D.C. 20555 4

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