ML19290E093

Responds to NRC 791212 Ltr Re Violations Noted in IE Insp Repts 50-498/79-20 & 50-499/79-20.Corrective Actions: Possibility of Concrete Segregation Discounted by Insp of Placement Form Removal

ML19290E093
Person / Time
Site:	South Texas
Issue date:	01/09/1980
From:	Eric Turner HOUSTON LIGHTING & POWER CO.
To:	Seidle W NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19290E091	List: ML19290E093
References
ST-HL-AE-404, NUDOCS 8003040228
Download: ML19290E093 (3)

Text

'

Houston Lighting f, j 4

& Power

/ -

Com3any Electric Tower PO. Box 1700

/ l I I- A I Houston. Texas 77001 January 9, 1980 ST-HL-AE-404 SFN: C-0570 Mr. W. C. Seidle Reactor Construction 6 Engineering Support Branch U.S. Nuclear Regulatory Commission Office of Inspection and Enforcement Region IV 611 Ryan Plaza Drive, Suite 1000 Arlington, Texas 76012

SUBJECT:

S0lTTH TEXAS PROJECT ELECTRIC GENERATING STATION RESPONSE TO NRC INSPECTION FINDINGS DOCKET NOS. 50-498/79-20 AND 50-499/79-20

Dear Mr. Seidle:

The following is Houston Lighting 6 Power Company's (HL6P) response to the item of noncompliance identified in IE Inspection Report Numbers 50-498/79-20 and 50-499/79-20, dated December 12, 1979.

Failure to Maintain an Unrestricted Vertical Dron of Concrete Corrective Action The placing operation for MEI-WO43-08A was arranged so concrete flowed through reinforcing steel while restricted to a chute as shown on the a -rached sketch. The deviation to ACI 304, Section 6.2, re.alted when the flow of concrete bounced off of the far side reinforcing steel instead of dropping vertically into forms.

For wall MEI-WO43-08A the possibility of concrete segrega-tion was discounted by inspection of the placement after form removal which showed no signs of segregation or rock pockets. Additionally, the placing inspector indicates satisfactory results for the placing operation including vertical drop and consolidation.

80080402 7

Houston bgh ng & Power Company Mr. Seidle January 9, 1980 Page Two Recurrence Control This problem was remedied by providing a batter board against the far side reinforcing steel so as to direct the concrete flow vertically into the forms. To pre-vent the recurrence, the QC Placing Inspectors have been instructed as to the proper arrangement of placing equipment for 12" wall placements using a side chute.

All corrective action and recurrence control measures have been implemented.

Very truly yours, c4 2.c./ -

E. A. Turner, Vice President Power Plant Construction 6 Technical Services EAT:rka Attachment cc: Messrs. G. W. Oprea, Jr.

D. G. Barker R. A. Fra:ar T. D. Stanley G. B. Painter M. L. Borchelt (CPL)

J. W. Moore (CPL)

J. B. Poston (CPS)

' R. C. Mecke (CPS)

R. L. Hancock (C0A)

M. C. Nitcholas (C0A)

M. D. Schwar: (Baker 6 Botts)

H. S. Phillips (NRC)

J. R. Guerts (BbR)

C. W. Vincent (B6R)

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