ML20004C088

Final Deficiency Rept Re Damage to Steel Liner Plate in Unit 2 Reactor Containment Bldg.Caused by Excessive Hydrostatic Pressure Applied to Portion of Liner Plate.Repair of Liner Plate Completed on 810430

ML20004C088
Person / Time
Site:	South Texas
Issue date:	05/22/1981
From:	Oprea G 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-669, NUDOCS 8106010500
Download: ML20004C088 (4)

Text

The Light comPuy Houston Lighting & Power eo. Box 1 00 Houston. Texas 77001 (713) 228-9211 May 22, 1981 ST-HL-AE-669 SFN: V-0530 N

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Rf .([y Q Mr. Karl Seyfrit Director, Region IV h gg{,291937 ,

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Nuclear Regulatory Comission O 611 Ryan Plaza Drive, Suite 1000 ME **h r %* .

Arlington, Texas 76012  % s' f

Dear Mr. Seyfrit:

• , d South Texas Project Units 1 & 2 Docket Nos. STN 50-498, STN 50-499 Final Report on Damage to the Steel Linee Plate in the Unit 2 Reactor Ci,$tainment Building On March 19, 1380, Houston Lighting & Power comitted to provide to your office a written report concerning damage to the steel liner plate in the Unit 2 Reactor Containment Building on the South Texas Project which would address the criteria outlined in 10CFR50.55(e). Attached is the final report concerning this item. -

l If you have any questions, please contact Mr. M. E. Powell at (713) 676-8592.

l Very truly yours, l

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Ex .. u ti v ce President HEP /fij Attachments

$17 8106 010 f00 l s'

if Hogton gigh ingt o Company May 22,1981 D. G. Barker ST-HL-AE-669 C. G. Robertson SFN: V-0530 Howard Pyle Page 2 R. L. Waldrop H. R. Dean D. R. Beeth J. D. Parsons L. K. English 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. Newnan (Lowenstein, Newnan, %is, & Axelrad)

Director, Office of Inspection & Enforcement /

Nuclear Regulatory Connission Washington, D. C. 20555 M. L. Borcnelt Charles Bechhoefer, Esquits President Chairman, Atomic Safety & Licensing Board Central Power & Light Company U. S. Nuclear Regulatory Commission P. O. Box 2121 Washington, D. C. 20555 Corpus Christi, Texas 78403 R. L. Range Dr. Janes C. Lamb, III Central Power & Light 313 Woodhaven Road P. O. Box 2121 Chapel Hill, North Carolina 27514 Corpus Christi, Texas 78403 R. L. Hancock Mr. Ernest E. Hill Director of Electrical Utilities Lawrence Livermore Laboratory City of Austin University of California P. O. Box 1088 P. O. Box 808, L-123 Austin, Texas 78767 Livermore, California 194550

. T. H. Muehlenbeck Citizens for Equitable Utilities, Inc.

I City cf Austin c/o Ms. Peggy Buchorn P. O. Box 1088 Route 1, Box 1684 Austin, Texas 78767 Brazoria, Texas 77422 J. B. Poston Pat Coy Assistant General Manager of Operations Citizens Con:erned About Nuclear Power City Public Service Board 5106 Casa Oro P. O. Box 1771 San Antonio, Texas 78233 San Antonio, Texas 78296 A. vonRosenberg Lanny Sinkin City Public Service Board 2207-0, Nueces P. O. Box 1771 Austin, Texas 78705 San Antonio, Texas 78296 Brian E. Berwick, Esquire Jay Gutierrez, Esquire Assistant Attorney for the State of Texas Hearing 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 4-28-81

i Mr. David P. Hoffman" April 24,1981 l

CC Mr. Paul A. Perry, Secretary U. S. Environmental Protection Consumers Power Conpany Agency 212 West Michigan Avenue Federal Activities Branch Jackson, Michigan 49201 Region V Office .

ATTN: EIS COORDINATOR Judd L. Bacon, Esquire 230 South Dearborn Strea Consumers Power Conpany Chicago, Illinois 60604 212 West Michigan Avenue Jackson, Michigan 49201 Herbert Grossman, Esq. , Chairman Atomic Safety and Licensing Board Joseph Gallo, Esquire U. S. Nuclear Pegulatory Comission Isham, Lincoln & Beale Washington, D. C. 20555 1120 Connecticut Avenue

. Room 325 Dr. Oscar H. Par' Washington, D. C. 20036 Atomic Safety an .icensing Board U. S. Nuclear Re story Comission t Peter W. Steketee, Esquire Washington, D. C 20555 505 Peoples Building Grand Rapids, Michigan 49503 Mr. Frederick J. 2n i

Atomic Safety a ' censing Board Alan S. Rosenthal, Esq. , Chairman U. S. Nuclear R story Comission Atomic Safety & Licensing Appeal Board Washington, D. ;0555 a U. S. Nuclear Regulatory Comission Washington, D. C. 20555 Big Rock Point ear Power Plant ATTN: Mr. C. J. -tman Mr. John O'Neill,11 Plant Sur ntendent l Route 2, Box 44 Charlevoix, Mich .;&n 49720 Maple City, Michigan 49664 Christa-Maria "

Charlevoix Public Library Route 2, Box 108C 107 Clinton Street Charlevoix, Michigan .49720 Charlevoix, Michigan

. William J. Scanlon, Esquire Chairman 2034 Pauline Boulevard County Board of Supervisors Ann Arbor, Michigan 48103 Charlevoix County l Charlevoix, Michigan 49720 Resident Inspector Big Rock Point Plant Office of the Governor (2) c/o U.S. NRC Room 1 - Capitol Building RR #3, Box 600 Lansing, Michigan 48913 Charlevoix, Michigan 49720 Director, Criteria and Standards Mr. Jim E. Mills Division Route 2, Box 108C Office of Radiation Programs Charlevoix, Michigan 49720 (ANR-460) l U. S. Environmental Protection Thomas S. Moore Agency Atomic Safety & Licensing Appeal Board i

Washington, D. C. 20460 U. S. Nuclear Regulatory Comission Washington, D. C. 20555 N ,

n FINAL REPORT DAMAGE TO THE STEEL LINER PLATE IN THE UNIT 2 REACTOR CONTAINMENT BUILDING I. Summary of The Incident On January 14, 1980, while performing hydrostatic flushing to determine flow paths between voids behind a specific area of liner plate in the Unit 2 Reactor Containment Building, excess hydrostatic pressure was inadvertently applied resulting in deformation to a portion of the liner plate.

On March 19, 1980, Houston Lighting & Power connitted to provide to your office a written report which would address the criteria outlined in 10CFR50.55(e).

An engineering evaluation was not performed to determine the safety significance of leaving the steel liner in the deformed condition due to Houston Lighting & Power's decision to repair the steel liner plate. The repair was subsequently completed on April 30, 1981.

!!. Description of The Incident On January 14, 1980, while performing hydrostatic flushing to determine the flow paths between voids in preparation for the repair of the concrete vo1J behind a specific section of the Unit 2 Reactor Containment Building liner plate, excess hydrostatic pressure was inadvertently applied resulting in the deformation to a 10 feet X 14 feet portion of the steel liner. The deformation of the steel liner measured approximately 4 inches at its maximum point. Upon identification of this item of nonconformance, it was determined that che deformed portion of the steel liner should be removed and replaced.

III. Corrective Action Due to the extent of the deformation and the inability to determine the possible damage to the containment liner stiffeners and concrete behind the liner, a decision was made to repair the damaged portion of the liner plate. The following actions were initiated to repair the deformed steel liner:

a. The damaged portion of the liner plate, measurino 10'-0" by 14'-11 1/2", was removed. The liner seam edges were prepared for welding in accordance with the subcontractor's contain-ment liner erection drawings.

b. Concrete behind the removed portion of plate was examined by Engineering for loose or damaged sections and no unusual or unexpected concrete void formations were identified.

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c. A B&R drawing, defining supplemental reinforcing steel details and the extent of grout repair, was prepared and issued for construction.

d. The removed section of tne plate was replaced with a new liner section, fabricated complete with stiffeners. A large section of previously fabricated stiffened liner plate, which was removed earlier to permit an opening for the equipment hatch, was utilized for the replacement liner section. A piece was cut from this large section to fit the dimensions of the removed panel.

e. 'The vold behind the newly installed section of plate was grouted in accordance with procedures previously established for the grouting of concrete voids in the RCB shell wall.

These procedures were previously transmitted to your office in the Final Report on Lift Fifteen for the Unit 1 Reactor Containment Building.

f. The reoair of the liner plate was successfully conpleted in the field on April 30, 1981.

IV. Recurrence Control The liner bulge was created by additional pressure which resulted because the control skid (with the monitoring pressure gauge) was located approximately twenty feet above the injection point on the liner. This created head pressure in addition to the gauge pressure.

Therefore, the recurrence control was to:

1. Locate the. control skid within ten feet of elevation of the injection point (s) on the liner.

2. Maintain continuous observation by QC of the gauge pressure on the control skid and at the injection point (s) during both j water and grout injection.

3. Use a gauge and a shutoff valve at the point of injection.

4. Maintain direct communication between the pump and the control skid.

V. Safety Analysis A safety analysis was not performed due to the decision to repair the deformed liner plate. The corrective action taken will insure that the containment liner will function as intended.

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