IR 05000327/1979037
| ML19208D375 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 08/08/1979 |
| From: | Compton R, Herdt A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML19208D367 | List: |
| References | |
| 50-327-79-37, 50-328-79-22, NUDOCS 7909280328 | |
| Download: ML19208D375 (5) | |
Text
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Report No. 50-327/79-37 and 50-328/79-22 Licensee: Tennessee Valley Authority 500A Chestnut Street Chattanooga, Tennessee 37401 Facility Name: Sequoyah Units 1 and 2 Docket Nos. 50-327 and 50-328 License Nos. CPPR-72 and CPPR-73 Inspection at Sequoyah Site near Chattanooga, Tennessee E!7!77 Inspector h
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./R.' Herd ~t, Section Chief, RCES Branch Date Signed
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SUMARY Inspected on July 18-20, 1979 Areas Inspected This routine, unannounced inspection involved 18 inspector-hours onsite in the areas of safety related structures (structural steel and supports), safety related components and followup on IE Bulletin 79-02.
Results Of the 3 areas inspected, no items of noncompliance or deviations were identified.
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DETAILS 1.
Persons Contacted Licensee Employees G. G. Stack, Project Manager
- J. E. Wilkins, Construction Engineer
- D. W. Mack, Assistant Construction Engineer
- H. J. Fischer, Mechanical Engineering Unit Supervisor
- E. L. Burke, Electrical and Instrumentation Inspection Unit Supervisor
- R. C. Miles, Unit 1 Coordination Unit Supervisor, Construction L. W. Jones, Welding and Mechanical Inspection Unit Supervisor Other licensee employees contacted included field engineers and QC inspectors.
NRC Resident Inspector
- W. T. Cottle
- Attended exit interview 2.
Exit Interview The inspector met with licensee representatives denoted in paragraph 1) at the conclusion of the inspection on July 20, 1979. The inspector summarized the scope and findings of the inspection of safety related structures (structural steel and supports), safety related components and followup on IE Bulletin 79-02. The licensee was advised that no items of noncompliance or deviations were identified during this inspection.
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 field installation and associated quality assurance records of the structural steel support for the Unit 1 mixed bed demineralizer were exam-ined. Installation and inspection requirements are detailed on TVA drawings 48N1232 and 48N1237, Inspection Instructions (II) 1, 36, 38, 75 and 93 and Construction Procedure C-2.
Completed data cards for the above II's were reviewed.
No items of noncompliance or deviations were identified.
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SafetyRelatedComponentsI-ObservationofforkandWorkActivities(Unit 2)
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The four installed CRDM coolers, including fan and motor units, were examined for conformance to TVA drawings 47W915-2, Revision 14; 48N950, Revision 6; and 48N951, Revision 6.
The general condition and cleanliness of these units indicated that they were being adequately protected from the environment.
No items of noncompliance or deviations were identified.
7.
Safety Related Components I - Review of Quality Records (Unit 2)
The inspector examined the completed quality records for the installation of the CRDM coolers. Inspection requirements for this equipment are con-tained in the following site procedures:
II-32 (Construction Procedure P-6), " Preventive Maintenance for Permanent Equipment" II-36, " Orientation and Alignment" II-75, " Visual Examination of Weld Joints" II-93, " Testing of Expansion Anchors Set in Hardened Concrete" Records examined were data cards and sheets for the above II's and Equipment Data Sheets from Procedure P-6 dated from January, 1978 through June 1979.
Maintenance Discrepancy Report M-65 was also reviewed.
No items of noncompliance or deviations were identified.
8.
Safety Related Structures (Structural Steel and Supports II) Review of Quality Records (Unit 2)
The structural steel access platform on the 724 elevation of the auxiliary building, detailed on TVA drawing 48N1216, was selected for inspection.
The installed platform was inspected against drawing requirements for basic configuration, expansion anchor installation and a sample check of material sizes and types. Erection of this structure is governed by Construction Procedure C-2, " Fabrication and Erection of Structural Steel".
Completed data cards (including revision B cards) and sheets for the following II's were reviewed:
II-1, " Inspection of Bolted Connections" II-36, " Orientation and Alignment" II-38, " Inspection of Site Fabricated Assemblies" II-75, " Visual Examination of Weld Joints" II-93, " Testing of Expansion Anchors Set in Hardened Concrete" In addition, pertinent engineering field notebook entries were reviewed.
The qualification records for the responsible QC inspectors were also examined.
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No items of noncompliance or deviations were identified.
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IE Bulletins (IEB)
(Open) IEB No. 79-02, Revision No. 1, Pipe Support Base Plate Designs Using Concrete Expansion Anchor Bolts, Units 1 and 2.
TVA's letter of July 5,1979 is being reviewed to determine whether the requested actions of the bulletin have been acceptably addressed.
The inspector examined the following specifications and procedures pertaining to expansion anchor (including mounting bolts) installation, inspection and testing:
- II-1, " Inspection of Bolted Connections"
- II-38, " Inspection of Site Fabricated Assemblies"
- II-66, " Inspection of Supports"
- II-93, " Testing of Expansion Anchors Set in Hardened Concrete"
- Construction Procedure C-8, " Expansion Anchor Installation, Testing and Documentation"
- Construction Procedure M-20, " Pipe Support Installation and Documentation"
" Construction Specification G-32 for Bolt Anchors Set in Hardened Concrete"
- These procedure apply to installations after early 1977
- These procedures apply to installations prior to early 1977
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^ J Tae following selection of anchor test data sheets (CP C-8 or II-93) were reviewed:
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Self Drilling Anchors (Pipe Supports)
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Auxiliary Building, Elevation 763, December 1975
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Auxiliary Building, Elevation 690, October 1974
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through February 1975
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Reactor Building 1, Crane Wall to Containment, Elev 669, February
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through December 1975 Reactor Building 2, July 23,1976 through September 23, 1976 Wedge Anchors
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g Reactor Building 2, Piping and ductwork supports, December 1977 l-through February 1979
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Reactor Building 2, Cable trays, November 1977 through June 1979 Instrumentation Hangers:
random sample of 1978 and 1979 data sheets The approximately 400 self drilling anchor test data sheets reviewed covered an earlier time period than the test data summary provided in TVA's response.
This review indicated that approximately 35% of installed anchors had been tested with less than 1 1/2t failures; a good correlation with tt - test information previously provided by TVA.
The review of wedge anchor test data sheets and discussions with inspection personnel revealed that 100% of wedge anchor installations were being torque checked by QC for cable tray and instrumentation supports, but only the sampling program required by 11-93 was being accomplished on pipe supports. However, the QC inspectors indicated that the craftsmen did not use a torque wrench during anchor installation and that some anchors did require additional tightening to achieve the preload torque specified in Construction Specification G-32.
Therefore some wedge anchors in pipe support installations may not have the preload required by specification.
TVA is reviewing all mechanical application wedge anchor test data sheets and will torque all wedge anchors not previously checked. The licensee agreed to revise site procedures to require torque preloading during instal-lation or require a 100% QC torque check of preload. It is noted that very few wedge anchors are installed at Sequoyah, mostly in the Unit 2 Shield Building.
This bulletin remains open pending completion of licensee actions concerning preloading of wedge anchors and final evaluation of TVA's response to this bulletin.
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