ML20086C482

Interim Deficiency Rept Re Incomplete Concrete Fill in Reactor Containment.Initially Reported on 740516.Caused by Failure to Use Special Concrete Mixture Prescribed by United Engineers & Constructors,Inc

ML20086C482
Person / Time
Site:	Salem
Issue date:	06/18/1974
From:	Betz J Public Service Enterprise Group
To:	Knuth D US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20086C480	List: ML20086C482
References
10CFR-050.55E, 10CFR-50.55E, NUDOCS 8311280025
Download: ML20086C482 (2)

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J f) v John F. Betz Pubhc Service Sectric and Gas Company 80 Park Place Newark, N J. 07101 201/622-7000 Vice-President in Charge of Electric Operation June 18, 1974 U. S. Atomic Energy Commission Directorate of Regulatory Operations 7920 Norfolk Avenue Bethesda, Maryland 20014 Attention of Mr. Donald F. Knuth, Director Gentlemen:

INCOMPLETE CONCRETE FILL REACTOR CONTAINMENT NO. 2 UNIT SALEM NUCLEAR GENERATING STATION DOCKET NO. 50-311 On May 16, 1974, a verbal report was made to Region 1, Directorate of Regulatory Operations, advising of a suspected incomple te concrete pour on the No. 2 Unit containment in the vicinity of the equipment hatch. This verbal report was in accordance with provisions of 10CFR50.55(e).

A review of the cause has determined that the special concrete mixture prescribed by United Engineers & Constructors, Inc.

Field Procedure 13 was not used. The special mix which was specified in the procedure was to improve the concrete flow and account for expected difficulty in consolidation which would be encountered in the congestion of reinforcement rod.

The nonconformance was observed during inspection the following day when the QC Supervisor noted the-presence of 3/4-inch ; stone in the area. The mixture prescribed by United Engineers &

Constructors, Inc. Field Procedure 13 requires 3/8-inch-maximum aggregate. A review of Batch Plant records confirmed the omission of the required mixture,'both in pour number nine as well as numbe r ten. Pours prior to1these.were reviewed and found acceptable on both No. 1 and 2 Units..

PSE&G Electric Engineering. Department has initiated an -investi-gation with the' aid offa consultant to determine the magnitude-and condition of any. voids. An ultrasonic inspection confirmed the presence of a relatively large void adjacent to.the liner in the equipment-hatch area. Further investigation is being conducted, consisting of the preparation of an. opening in the' 4 5 63-8311290025 PDR p p 0740712 6 g.

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<j t-U.S. Atomic Energy 6-18-74 Commission steel liner. After the opening has been made, the configuration of the void and sound concrete will be mapped and the liner r plate will be restored. Repair of the void pocket will be by filling with a non- shrinking, high strength grout via grout holes in the containment liner. Detailed procedures for all phases of this repair are being prepared and will be reviewed and approved prior to start of repair work. The repair pro-cedures, results of the investigation and final repair documenta-tion will be available at the site for further review by the Directorate of Regulatory Operations Inspector.

The seriousness of this nonconformance which resulted from a failure to follow approved procedures has led to disciplinary action on those individuals responsible. The authority and responsibility for stringent enforcement of procedures by the Field Quality Control Engineers will be furthe r emphasized through field orientation and training sessions.

If you desire additional information on the subject item, please contact us.

Very truly yours, i

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