IR 05000424/1979019
| ML19309B609 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 01/22/1980 |
| From: | Conlon T, Lenahan J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML19309B599 | List: |
| References | |
| 50-424-79-19, 50-425-79-19, NUDOCS 8004040430 | |
| Download: ML19309B609 (4) | |
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UNITED STATES
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g NUCLEAR REGULATORY COMMISSIOfJ
g ua REGION 11
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o, 101 MARIETTA ST,, N.W., SulTE 3100
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ATLANTA, CEORGIA 30303
JAN 2 31980 Report Nos. 50-424/79-19 and 50-425/79-19 Licensee: Georgia Power Company 270 Peachtree Street, N.W.
Atlanta, Georgia 30303 Facility Name: Vogtle P1 at Docket Nos. 50-424 and 50-425 License Nos. CPPR-108 sad CPPR-109 Inspection at Vogtle site near Waynesboro, Georgia Inspector:_
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. J. Lenahan Date Signed Approved by:
/-Z2.~80 T. E: Conlon, Section Chief, RC&ES Branch Date Signed SUMmfARY Inspection on December 27, 1979 Areas Inspected This special unannounced inspection involved five inspector-hours onsite in the areas of licensee identified items, soils and concrete laboratory, and construc-tion status.
Results Of the areas inspected, no items of noncompliance or deviations were identified.
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DETAILS 1.
Persons Contacted Licensee Employees
- H. H. Gregory, III, Assistant Project Manager
- E. D. Groover, QA Site Supervisor
- B. C. Harbin, Civil Project Section Supervisor
- L. Kinney, Civil Engineering Supervisor Other licensee emploes contacted included two civil QC inspectors.
Other Organizations
- J. E. Mah1meister, Senior Resident Engineer, Bechtel
- J. M. Lovekamp, Civil Resident Engineer, Bechtel
- J. M. Duf'y, General Superintendent, Walsh Construction Co.
- F. R. McCarty, Project Manager, Walsh Construction Co.
- Attended exit interview
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2.
Exit Interview The inspection scope and findings were summarized on December 27, 1979, with those persons indicated in Paragraph 1 above.
3.
Licensee Action on Previous Inspection Findings Not inspected.
4.
Unresolved Items Unresolved items were not identified during this inspection.
5.
Independent Inspection Effort The inspector examined the project soils and concrete laboratory and the project's construction status.
No deviations or items of noncompliance were identified.
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Licensee Identified Items [10 CFR 50.55(e)]
Prior to the inspection the license identified the following items under 10 CFR 50.55(e):
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(Open) Item (424/425/79-18-01):
-Erosion of Category I Back Fill.
a.
The inspector toured the powerblock area and observed the measures which had been taken to stabilize the excavation slopes and Category I back fill from further erosion. These measures included regrading, placement of sandbag dikes, and stabilization of fill and excavation slopes with grout and lean concrete.
The licensee had completed installation of piezometers. Reading of the piezometers and recording of the ground water elevation in the powerblock excavation area was to begin on the date of the inspection following completion of testing which was being performed to verify the piezometers were functioning properly. The installation of the dewatering system was in progress.
The inspector witnessed installation of well point 13 and observation well 13A. The well points were being installed in accordance with NRC requirements and licensee commitments.
The drill holes were being cased to one foot below top of marl and the volume of material required to backfill the holes following installation of the well point was being accurately determined. Drilling and we11 point installation was being continuously monitored by a QC inspector. The licensee will obtain Region II concurrence prior to startup of the dewatering system.
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(0 pen) Item (424/425/79-19-01): Voids in Auxiliary Building Concrete.
The licensee notified Region II on December 20, 1979, of a potential deficiency involving voids in the concrete in walls of the Auxiliary Building. The voids occurred in walls which were heavily congested with reinforcing steel, embedments, pipe sleeves and blockouts.
In addition, small voids were detected along the edges and in corners at the bottoms of heavily congested walls.
Stop work notice number SW-C-13 was issued on December 20, 1979, to stop concrete placement in heavily c*ongested auxiliary building walls.
The inspector examined the auxiliary building walls which contained voids. The voids occurred between and under adjacent blockouts when the space between the blockouts was less than 12 inches. There were approximately six voids in three walls which varied in size from l ' X l ' X 6" to 6' X 3' X l'.
There were several smaller voids and treas of honeycomb in the same three walls and other walls. The void size is related to the amount of congestion in the walls. In addition there were small voids along the edges and in corners at the bottoms of several walls.
These voids were two to three inches in height at the face of the wall and extended a distance of 3" into the wall. The lengths of these voids varied from one to four feet and resulted from improper cleaning of forms prior to concrete placement. The walls containing the voids are 3' thick.
The inspector reviewed the stopwork notice. The corrective action proposed by the licensee to address the void problem is as Jollows:
(1) To assure proper cleanout at base of forms and adequate preplacement inspection, one foot high by four feet wide forms will be installed along the entire length at the base of walls. Every other panel will
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be lef t out until after final cleanout and inspection is completed.
The wal) forms which were in place were being reworked to meet this requirement.
(2) To eliminate voids in heavily congested areas.
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(a) Port holes will be provided for inspection, placement and consolidation of concrete around blockouts, pipe sleeves and other heavily congested areas.
(b) Additional horizontal construction joints will be provided to insure sufficient access for preplacement inspection, placement, consolidation, and inspection of consolidation.
The voids are contained in walls which were placed for their full height of 21 feet. The addition of horizontal construc-tion joints will reduce the height of placement.
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(c) Small diameter fone inch) vibrators will be provided for use in congested areas.
(d) Additional training v4.ll be provided to re-emphasize to craft and QC personnel the importance of proper consolidation of concrete.
The inspector reviewed the paragraphs of Becthel Specification X2AP01,
" Forming, Placing, Finishing and Curing of Concrete", and GPC procedure CD-T-02, " Concrete Quality Control", which address repairs to concrete.
The inspector also reviewed nonconformance reports written to disposition and repair the voids. Removal of unsound material and honeycomb around the voids was in progress. The licensee stated that NRC will be notified
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prior to resumption of concrete placements in heavily congested auxiliary
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building walls.
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