ML20009F036

Interim Deficiency Rept Re Concrete Repair Program of Reactor Containment Bldgs,Per NRC 810520 Request.Containment Liner Sounded in Order to Map Potential Void Areas. Exploratory Drilling Performed.No Voids Found

ML20009F036
Person / Time
Site:	South Texas
Issue date:	06/22/1981
From:	Goldberg J HOUSTON LIGHTING & POWER CO.
To:	Seyfrit K NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
References
10CFR-050.55E, 10CFR-50.55E, ST-HL-AE-684, NUDOCS 8107280622
Download: ML20009F036 (3)

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.gca/9s em The Light Company n ,mi... u a hs a a>.,m mm, mon n ,mi.,ii.wimonwomsmn June 22, 1981 ST-HL-AE-684 SFN: V-0530 fs g v, h \\,.,g@# -'

Mr. Karl Seyfrit D 6-

,h Director, Region IV Nuclear Regulatory Commission i p '1 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

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Dear Mr. Seyfrit:

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South Texas Project Units 1 & 2 Docket Nos. STN 50-498, 50-499 Supplemental Information Regarding the Concrete Repair Program of the Reactor Containment Buildings On May 20, 1981, during an inspection of Houston Lighting & Power's documentation for 10CFR50.55(e) items, Mr. J. Tapia of your office requested supplemental information concerning the concrete repair program utilized in the rcoair of the Reactor Containment Building (RCB) shell walls. The request for additicnal information was limited to those concrete repairs required as a result of the Lift No. 8 Concrete Void Investigation. Therefore the following information is provided in response to Mr. Tapia's request.

The method for repair of the concrete voids in the Reactor Containment Building shell walls basically comprised the following steps:

(1) The containment. liner was " sounded" in order to map potential void areas.

(2) Exploratory holes were drilled to determine the actual void area.

(3) All voids were hydrostatically pressure tested using the holes to determine which voids were interconnected behind the liner plate.

(4) Pumping of the grout was then initiated. Grout injection was made at the lowest open insert for an individual repair area as determined by the hydrostatic pressure test. As the grout filled the void successively higher insert holes were shut off N7 / f (closed) as full consistency grout flowed through the hole (i.e. j/ /

water-dilluted grout and/or air bubbles were allowed to escape). H hjj7280622810622 S ADOCK 05000498 PDR

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8 o llouston I.ighting & Power Company June 22, 1981 ST-HL-AE-684 SFN: V-0530 Page 2 (5) The holes drilled into the liner plrte were repaired using couplings and plugs. These couplings were machined to fit the holes and welded to the liner to meet ASME requirements. Plugs were inserted into the couplings and seal welded.

(6) Training was requirad of all personnel involved in the repair program.

(7) Repairs were witnessed by a Brown & Root QA/QC 'nspector and performed under th direction of, and evaluated by, Design Engineering or a professional consultant.

The adequacy of this repair method was verified following the repair of Lift 15 in RCB 1. Holes were drilled through the liner into the grouted area to determine whether there were any ungrouted voids, and to inspect the quality of the grout in place and the grout-concrete interface. Examination of each of these holes revealed solid grout, concrete, or both. No voids were found, and the interfaces between the. grout and concrete were tight. Additionally, a polar crane girder bracket was successfully load tested, also demonstrating that this repair method was adequate.

If there are any questions regarding this item, please contact Mr. R. R.

Hernandez at (713) 676-8211.

Very truly yours,

n. 9su J. H. Goldburg Vice President Nuclear Engineering and Construction RRH/SSR/amj i

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h Ilouston cc: J.Li h.tinkroldberg k Power Coinpan June 22, 1981 D. G. Barker ST-HL-AE-684 C. G. Robertson SFN: V-0530 Howard Pyle Page 3 R. L. Waldrop H. R. Dean D. R. Beeth J. D. Parsons

, J. W. Williams

J. W. Briskin R. A. Frazar STP RMS H. S. Phillips (NRC)

J. O. Read (Read-Poland,Inc.)

M. D, Schwarz (Baker & Botts)

R. Gordon Gooch (Baker & Botts)

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

Director, Office of Inspection & Enforcement Uuclear Regulatory Commission Washington, D. C. 20555 M. L. Borchelt Charles Bechhoefer, Esquire President Chairman, Atomic Safety & Licensing Board Central Power & Light Compar. U. S. Nuclear Regulatory Commission P. O. Box 2121 Washington, D. C. 20555 Corpus Christi, Texas 78403 R. L. Range Dr. James C. Lamb, III Central Power & Light 313 Woodhaven Road P. O. Box 2121 Chapel Hill, North Carolina 27514 Corpus Chrirti, Texas 78403 R. L. Hancoch Mr. Ernest E. Hill Director of f lectrica; Utilit c Lawrence Livermore Laboratory City of Austin University of California P. O. Box 1088 P. O. Box 808,l.-123 Austin, Texas 78767 Livermore, California 94550 T. H. Muehlenbeck William S. Jordan, III City of Austft Harmon & Weiss P. O. Box 108d 1725 I Street, N. W.

l Austin, Texas 78767 Suite 506 i Washing'.on, D. C. 20006

. J. B. Pos+.on Lanny Sinkin Assistant General Manager of Operations Citizens, Concerned About Nuclear Power City Public' Service Board 5106 Casa Oro P. O. Box 1771 San .intonio, Texas 78233 j San Antonio, Texas 78296 A. vonRosenberg Citizens for Eqeitable Utilities, Inc.

City Public Service Board c/o Ms. Peggy Buchorn-P. O. Box 1771 Route 1, Box 1684 San Antonio, Texas 78296 Brazoria, Texas 77422 ,

Brian E. Berwick, Esquire Jay Gutierrez, Esquire Assistant Attorney for the State of Texas Haaring Attorney P. O. Box 12548 Office of the Executive Legal Director Capitol Station U. S. Nuclear Regulatory Commission Austin, Texas 78711 Washington, D. C. 20555 6-9-81 L