IR 05000287/1979013
| ML15222A054 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 06/19/1979 |
| From: | Ang W, Herdt A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML15222A052 | List: |
| References | |
| 50-287-79-13, NUDOCS 7907260076 | |
| Download: ML15222A054 (4) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION
REGION II
101 MARIETTA ST., N.W., SUITE 3100 ATLANTA, GEORGIA 30303 Report No. 50-287/79-13 Licensee:
Duke Power Company Post Office Box 33189 422 S. Church Street Charlotte, North Carolina 28242 Facility Name: Oconee Nuclear Station, Unit 3 Docket No.:
50-287 License No.: DPR-55 Inspection at Oconee Nuclear Station near Seneca, South Carolina and at Duke Corporate Office, Charlotte, North Carolina Inspector: _U (, -
C11 W. P Date Signed Approved by:
A. R. Herdt, ection Chief, RC&ES Branch Date Signed SUMMARY Inspection on May 31 - June 1, 1979 and June 6-8, 1979 Areas Inspected This routine unannounced inspection involved 30 inspector-hours onsite and the Duke Power Company corporate office in the areas of concrete expansion anchor testing procedures, work activities and record Results Of the areas inspected, no apparent items of noncompliance or deviations were identifie n7907260076
DETAILS 1. Persons Contacted Licensee Employees Oconee Nuclear Site
- J. E. Smith, Plant Manager
- J. M. Davis, Superintendent of Maintenance
- D. M. Thompson, Mechanical Maintenance Engineer
- L. V. Wilkie, Mechanical Maintenance B. W. Carney, Mechanical Maintenance Other licensee employees contacted included 3 construction craftsme NRC Resident Inspector
- F. Jape Duke Corporate Office
- J. R. Wells, Corporate QA Manager
- S. B. Hager, Chief Engineer, Civil Engineering Division
- R. B. Priory, Principal Engineer, Civil Engineering Division
- C. L. Ray, Design Engineer M. Cline, Technical Associate, Mechanical Nuclear Division
- Attended exit interview on June 1, 1979
- Attended exit interview on June 8, 1979 2. Exit Interview The inspection scope and findings were summarized on June 1, 1979 at Oconee Nuclear Station and June 8, 1979, at the Duke Corporate Office with those persons indicated in Paragraph I abov. Licensee Action on Previous Inspection Findings Not inspecte. Unresolved Items Unresolved items were not identified during this inspectio. Concrete Expansion Anchor Testing Procedures, Work Activities and Records a. Testing Results (Site)
As a result of IE Bulletin No. 79-02, Duke Power Company (DPC), initiated an inspection and test program to identify and correct deficiencies found in concrete expansion anchors for s4fety related pipe support DPC has issued the following procedures for the inspection and test program:
(1)
MP/O/A/3018/50 Change 0 - Pipe Support Surveillance (2)
MP/O/A/3018/51 Change 0 - Self Drilling Anchor Testing on Pipe Supports The pipe support surveillance procedure identifies and documents
"as-built" information for all safety related pipe supports and their concrete expansion anchor The self drilling anchor test procedure is being used for verifying,on a sampling basis, the anchor design strength and its proper installatio b. Observation of Work Activities and Record Review (Site)
The "pipe support surveillance" had been started inside the containment buildin Reports on 32 hangers were reviewe Fifteen hangers were reported to be discrepan The discrepancies noted ranged from no hanger detailed drawings, and not per plan configuration/dimensions, to smaller than plan required bolt installed and loose concrete anchor Approximately 100 additional preliminary reports were also available but had not yet been reviewed by site engineer Twelve inspections and test of self drilling concrete expansion anchors have been performe Four (4) inspections revealed insufficient bolt thread engagement, one inspection showed a loose anchor, one inspection showed concrete cracked around 3 of 12 concrete expansion anchors in a base plate, and 2 inspections showed a total of 4 bolts welded to the backside of baseplates and no anchor shells installed in the concret Four of the twelve bolts inspected and tested passe An inspection of one of the installed baseplates that had a welded concrete expansion anchor bolt did not reveal any readily apparent reason for not installing an anchor sleev The baseplate installation with the concrete cracked around 3 bolts was also examine The inspection and testing of hanger number RJ-48-1036 were observe c. Design Engineering Work Activities DPC Design Engineers prepared work packages for the surveillance and testing of the concrete expansion anchor The surveillance and testing is being performed by the site and the results are being sent to the Design Engineers for evaluation and preparation of any subsequent repair instructions that may be necessar DPC's record keeping system was reviewed to assure that all concrete expansion anchors that need to be inspected and tested, are tested, results are evaluated, and any necessary repairs are accomplishe The surveillance and test procedures were discussed with the Design Engineer Several inspections regarding verification of proper installation of self drilling anchors are not required to be performed by the DPC procedures. These inspections are for embedment depth of
-3 the anchor, inspection for enlargement of base plate bolt holes and inspection for full expansion of the anchor shell by measuring cone engagement. The licensee indicated that embedment depth and bolt hole enlargement was now being inspected for at the sit However, the licensee felt that inspection for full expansion of the anchor shell was not necessary since proper installation was being verified by a static pull test at a load equivalent to kth the anchor ultimate capacit An inspector follow-up item, 50-287/79-13-01, inspections required by Procedure for IE Bulletin 79-02, was opened on the above three items to assure that inspection for proper installation is accomplishe The DPC approach for considering base plate flexibility was discussed with Design Engineers. The DPC approach to responding to IE Bulletin 79-02 questions regarding design requirements for cyclic loads was also discusse DPC Design Engineers indicated that tests are being performed by an independent laboratory to verify their requirements for cyclic loads and to confirm their requirements on preloading concrete anchor bolts. However, DPC felt that the noted tests may not support the desired start-up date for Oconee Unit A few sleeve or wedge type anchors may be installed at Oconee Unit DPC Design Engineers feel that if these require testing, procedures used by Catawba would be issued for Oconee. The Catawba procedure for testing sleeve and wedge type concrete anchors, Construction Procedure 115, Rev. 4 was reviewe No items of noncompliance or deviations were identified.