ML19332A891

Submits Addl Characterizations of Two Categories of Surface Irregularities Identified & Mapped in Accordance W/Const Verification Program

ML19332A891
Person / Time
Site:	Marble Hill
Issue date:	08/13/1980
From:	Shields S PSI ENERGY, INC. A/K/A PUBLIC SERVICE CO. OF INDIANA
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 8009180533
Download: ML19332A891 (3)

Text

b

/

[ A.]

PUBLIC SERVICE August 13, 1980 INDIANA S. W. Shields Senior Vice Presdent -

Nuclear Dmsion Marble Hill P. O. Box 190 New Washington, IN 47162 Mr. James G. Keppler U. S. Nitelear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137

Subject:

Marble Hill Nuclear Generating Station, Units 1 & 2 Special Process Procedure SPP-5

Dear Mr. Keppler:

Pursuant to a conference call on August 8, 1980 between Region III Staff Personnel Messers C. Will'sms, D. Hayes and F. Hawkins and PSI Personnel Messers G. Brown, V. McMahon, L. Ramsett, T. Burns, D. Ingmite and myself, PSI is transmitting some additional characterizations of the two categories of surface irregularities which were defined, identified and mapped in accordance with PSI's Construction Verification Program.

If Region III Personnel need any additional information, please feel free to call.

Sincerel,

,(

. W. Shields Senior Vice-President Nuclear Division DI/dc cc:

C. Williams D. Hayes F. Hawkins J. Harrison

.MID 181980' god K>eot 9-60 PM P.O. Box 190, New Washington, Indiana 47162 812. 293.4441

. 8009180 5 3 3 Af

/ocation MARBLE HILL FIELD OFFICE date AUGUST 11, 1980 V\\ E subject; MARBLE HILL NUCLEAR GENERATING STATION, UNITS 1 & 2 S

INDIANA SPECIAL PROCESS PROCEDURE SPP-5 attention:

G. BROWN Pursuant to several recent conversations between Region III Staff Personnel and PSI, Project Engineering would like to provide Region III with some additional information and characterizations of the two (2) categories of concrete surface irregularities at the Marble Hill Nuclear Generating Station, Units 1 & 2.

These two concrete surface irregularities, concrete patches and repair areas, were defined, identified and mapped in accordance with PSI Special Process Procedure SPP-5 entitled " Concrete Surface Irregularities" as part of PSI's Construction Verification Program.

In a review of the comment sheets and drawings compiled during the SPP-5 inspection 2936 concrete patches and 3060 repair areas were identified.

PSI has committed to remove these patches to sound concrete and replace the removed patch area with approved concrete material in accordance with procedures reviewed and approved by PSI.

In a like manner the repair areas will be evaluated and unsound concrete which affects the service and integrity of the structure will be removed and replaced.

As part of the concrete repair program, PSI will take the necessary precautions to assure that the loading of the structural members is adequate to support the members during the concrete removal, repair and curing processes to assure the safety of the structure and construction personnel.

It should be noted that by reviewing the comment sheets and drawings compiled during the SPP-5 inspection PSI has estimated that ninety to ninety-five percent of the concrete patches and repair areas are characterized as insignificant. These areas consist of bug holes, seams at form work, shallow sand streaking, tie holes, concrete overlap (form mismatch), mortar loss from form work, minor honeycomb at form joints or construction joints and around embeds and pipe sleeves and embedded wood splinters. These are considered cosmetic in nature and should not affect the integrity of the structure.

Of the remaining patches and repair areas identified, approximately three to five hundred may be characterized as minor structural defects or structural defects. These areas are lacking complete consolidation of concrete which may reduce the load carrying capacity of concrete members. Minor structural defects are these 1/2 to 2 1/2 inches in depth, depending on the concrete cover required, which may cause a decrease in corrosion resistance or fire protection. Structural defects are those that exceed the depth of minor structural defects. Concrete members with either minor structural and structural defects or both must be evaluated on a case by case basis depending upon loading and in-service conditions. The Engineering evaluation will be completed on a case by case basis for each concrete member and repairs made as necessary. There will be no cumulative effects on the overall safety or integrity of the structure. Both the integrity of the individual structural members and the structure as a whole will not be jeopardized prior to the completion of the repairs.

$ H 6-1102 R SIM

~

August 11, 1980 - P go 2 l

Subj:ct: Sp;cisi Pr:ccco Pr:ctdure SPP-5 Based on PSI commitments in the " Description of Licensee Activities Addressing Order Confirming Suspension of Construe. tion", dated February 28, 1980, and the procedure SPP-5 which had Region III concurrence prior to implementation, PSI is prepared to begin rework of the patches and repair areas as soon as Region III releases PSI to restart Category I Concrete Work.

It has been PSI's understanding that the Region III approval of the Construction Verification Program and the subsequent demonstrations and release for Category I work is not contingent on the patching program identified and mapped in accordance with SPP-5. With the submittal of SPP-5 on July 18, 1980, PSI has co=pleted the confirming order co=mitments and will await Region III approval of the Construction Verification Program Final Report. Upon receiving this approval PSI will begin construction demonstrations.

If there are any questions, please feel free to contact me.

Kr ENGINEERING DAVID B. INGF R Construction V -ification Coordinator m

APPROVED:

frofsckTngineeringMa r

DBI/dke e