IR 05000454/1979013
| ML19209C118 | |
| Person / Time | |
|---|---|
| Site: | Byron  |
| Issue date: | 08/31/1979 |
| From: | Hayes D, Suermann J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| Shared Package | |
| ML19209C117 | List: |
| References | |
| 50-454-79-13, 50-455-79-13, NUDOCS 7910110727 | |
| Download: ML19209C118 (5) | |
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U.S. NUCLEAR REGULATORY LOMMISSION OFFICE OF INSPECTION AND ENFORt'EMENT
REGION III
Report No. 50-454/79-13; 50-455/79-13 Docket No. 50-454; 50-455 License No. CPPR-130; CPPR-131 Licensee:
Commonwealth Edison Company P. O. Box 767 Chicago, IL 60690 Facility Name: Byron Nuclear Power Station, Units 1 and 2 Inspection At: Byron Site, Byron, IL Inspection Conducted: August 23 and 24, 1979
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Inspector:
J. F. Suer (lk 3/, / W7
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[77 Approved By:
yes Engineering Support Section 1 Inspection Summary Inspection on August 23 and 24, 1979 (Report No. 50-454/79-13; 50-455/79-13)
Areas Inspected: Routine, unannounced inspection:
review of procedures and observation of containment post tensioning tendon installation, button-heading, stressing and greasing; review of tendon QA records, observatio..
of containment structural concrete work. The inspection involved a total of 13 inspector-hours onsite by one (1) NRC inspector.
Results: Of the four areas inspected, no items of noncompliance or unresolved items were identified.
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DETAILS Persons Contacted Principal Licensee Employees
- R.
C. Aken, QA Coordinator K. J. Hansing, QA Engineer
- f. A. Klink, QA Inspector
- J. J. Mihovilovich, Lead Structural Engineer
- M. J. Pendleton, Engineer, SCD J. T. Porter, Mechanical QA Coordinator G. Sorensen, Superintendent, SCD
- M. A. Stanish, OA Engineer
- Denotes those at exit meeting Blount Brothers Cor.struction Company J. Eugren, Production Foreman D. H.crel, QC Inspector D. Hoffman, QC Inspector H. Jackson, QC Inspector E. Keen, QC Inspector W. Schneider, QC Inspector Inland-Ryerson Steel Company J. Johnston, Inryco Field Representative 1.
Review of Post Tensioning Tendon QA Procedures The inspector reviewed Sargent & Lundy Specification F/L-2721,
" Containment Post Tensioning," Amendment 1, dated December 9, 1977.
The specification was posted through Engineering Change Notice (ECN)
586 which revised the number of shims allowed for use in the stressing operation.
Sargent & Lundy Specification F/L-2722, " General Structures Work", Revision 14, dated May 18, 1979 was also reviewed for it's application to the tendon operation. The following implementing procedures were reviewed against the requirements of the above specifications and appeared to be acceptable:
a.
Blount Brothers QA-QC Work Procedure No. 44, " Installation of Post Tensioning Tendons," Issue 6, Revision 5, dated May 7, 1979.
b.
QA-QC Procedure No. 45, " Installation of Field Anchor Heads and
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Field Button Heading of Post Tensioning Tendons," Issue 4, Revision 3, dated May 7, 1979.
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c.
QA/QC Procedure No. 46, " Stressing of Post Tensioning Tendons,"
Issue 5, Revision 4, dated May 22, 1979.
All three procedures had been reviewed by the Commonwealth Edison staff and approved by Sargent & Lundy.
2.
Observation of Tendon Installation, Button Heading, Stressing and Grease Work a.
Tendon installation. On August 23, 1979, the IE inspector witnessed the installation of tendon V-40, a 221' long vertical
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tendon positioned on the north side of containrent unit 1.
The tendon sleeve curves around the equipment hatch in the north vall and,after several attempts to insert the tendon, two tendon wires would not insert properly with the remainder of the bundle. The tendon was extracted and relocated to a storage barn where the tendon was to be tagged with a HOLD tag.
The licensee stated possible further action would be to uncoil the tendon and reband it, or remove the two wires for ease of insertion, or requisition another tendon frca the supplier. On August 24, the inspectar witnessed the installation of tendons V-44 and V-45.
Tendon V-44 was 221'-7+" in length and fitted with shop anchor head HX-385.
Tendon V-45 was 222' in length and fitted with shop anchor head GT-266.
Both tendons had a Category A wire condition and the QC inspector performed the required checks on the wire protrusion length, shop anchor head, and corrosion protection. Both tendons were installed without complication and according to the procedures.
b.
Tendon stressing: On August 23, 1979, the IE inspector witnessed the stressing of the H-55 tendon set. The H-55 set c'ausisted of three tendons spanning buttresses A-B-C in a horizontal direction. All three tendons were stressed simultaneously from both ends according to procedure. The required elongation and pressure gauge recdings were taken and none of the tendons axperienced any broken wires during the stressing operation.
The number of shims were within the specification limits.
c.
Tendon button heading: On August 24, 1979, the inspector witnessed the continuation of button heading of tendon V-60 which was fitted with field anchor head NX-386. Approximately 70% of the 170 tendon wires had been button headed on a previous day and when seven unacceptable button heads were found, the problem was traced to a dir*.y butten head jack. After thoroughly cleaning the jack jaws, the button heading proceeded smoothly.
The required tensile test per procedures was run before the button heading started for the day and the test results were acceptable. The inspector witnessed the production of approxi-mately 15 button heads which met the required QC checks.
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Buttonheading progressed on the remaining tendon wires with one
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additional defective button head (for a total of eight) being formed.
Per procedures the eight defective button heads were cut off, the wires re-button headed, and checked. All eight new button heads were found acceptable.
d.
Tendon greasing: On August 24, 1979, the inspector witnessed the greasing operation being performed on horizontal tendon H-61AC. The operation was being performed within the 90 day installation to grease time frame permitted by the specit'ication.
The inspector verified the tank temperature to be 200 F (speci-
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fication limits are 150-210 F); the measured eitlet temperature at the grease can was 90 F.
No problems were encountered.
3.
Review of Tendon QA Records a.
Blount Brothers Corporation personnel were executing the record of outside storage as required bv procedures.
BBC Forms (Duration of Outside Tendon Storage) dateo June 4, 1979 and August 24, 1979 indicated the storage times for tendon H-55CB, H-55AC, H-55BA and V-40.
The entry for tendon V-40 indicated that the tendon was tagged and returned to inside storage after the installation problems were encountered.
b.
Tendon stressing cards for tendons H-55CB, H-55Bi and H-55AC, all dated August 23, 1979, were reviewed by the IE inspector.
All three records were executed as required.
Lockoff pressures, elongations, and number of shims were all within the soecified tolerances or limits. The Field Gauge Accuracy Verification Record for all six gauges used in the stressing operation indicated the gauges were calibrated prior to use as required and fell within the calibration tolerances specified. Aidi-tionally, all s!.auges had been calibrated in June on a Dead Weight Pressure device and met the required calibration standards.
Post fensioning Tendon Stressing Inspection Checklists for tendons H-55AC, H-55CB, and H-55AB indicated all checkpoints had been verified.
c.
The Report of Button Head Sample Test, dated August 24, 1979, on tendon V-60 cas reviewed by the inspecter. The inspection found the G0/N0-GO test, eccentricity, slips and splits to be acceptable on the sample buttonhead. Additionally, the rupture test resulted in a Type A rupture which was acceptable.
4.
Other Areas Inspected The IE inspector was notified by the station construction department late on August 24, 1979 that a concrete pour was to be made on the Containment Unit I construction opening shortly.
Containment No. 1
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Construction Opening Pour No. 3 was a pour approximately 10 feet-4-1129 019
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deep at elevation 453'-7" consisting of approximately 80 CY of 5500 psi concrete (Type II Cement) using mix design M55-99. The " Concrete Placement Checkout Sheet" was signed as required. The placement portion of the " Concrete Inspection Checklist" had been executed and signed by the QC inspector. The placement and post placement portions were to be done as work progressed. The QC inspector had completed his final checks and the order was sent to the batch plant requesting the grout which not only primed the pumpline but also served to form a construction joint for the pour. The forms had been wetted down previously and the vibration crew was organized and ready for operation.
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Two 3" air driven vibrators were to be used on the pour. The " Post Tensioning Embedment Inspection Checklist" was completed and signed by the QC inspector. Other inspection requirements prevented the observation of the placing techniques and vibrator s.
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in operation.
The activities and documents noted appeared to be acceptable.
No items of noncompliance were identified in the above areas.
Exit Interview The inspector met with site staff rep':esentatives at the conclusion of the inspection en August 24, 1979. The inspector discussed the scope and findings of the inspection which were acknowledged by the licensee.
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