REGULATORY FORMATION DISTRIBUTION SY*EM (RIDS)

ACCESSION NBR:8703100027 DOC.DATE: 87/03/02 NOTARIZED: NO DOCKET # FACIL:50-270 Oconee Nuclear Station, Unit 2, Duke Power Co. 05000270 AUTH.NAME AUTHOR AFFILIATION

TUCKERH.B. Duke Power Co. RECIP.NAME RECIPIENT AFFILIATION

Document Control Branch (Document Control Desk)

SUBJECT: Inservice insp rept for 860901-1231.Containment bldg tendon surveillance inspected for anchorage condition & tensioning force.

DISTRIBUTION CODE: A047D COPIES RECEIVED:LTR 4 ENCL _ SIZE:_ TITLE: OR Submittal: Inservice Inspection/Testing

NOTES:AEOD/Ornstein:lcy. 05000270

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL

PWR-B ADTS 1 1 PWR-B EB 1 1 PWR-B PD6 LA 1 0 PWR-B PD6 PD 04 5 5 PASTISH 1 1

INTERNAL: ADM/LFMB 1 0 AEOD/PTB 1 1 NRR/DSRO/EIB 1 1 NRR/ 1 1 OGC/HDS2 1 0 01 1 1

EXTERNAL: LPDR 03 1 1 NRC PDR 02 1 1 NSIC 05 1 1

NOTES: 1 1

TOTAL NUMBER OF COPIES REQUIRED: LTTR 19 ENCL 16

DuKE POWER GOMPANY P.O. BOX 33189

CHARLOTTE, N.C. 28242 HAL B. TUCKER TELEPHONE

VICE PRESIDENT (704) 373-4531 NUCLEAR PRODUCTION

March 2, 1987

U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D. C. 20555

Subject: Oconee Nuclear Station, Unit 2 Docket No. 50-270 Tendon Surveillance Report

Gentlemen:

Pursuant to Oconee Nuclear Station Technical Specification 6.6.3 please find attached the Oconee Unit 2 Reactor Building Tendon Surveillance Program Report. This report is submitted to fulfill the requirements of Technical Specification 4.4.2.1 regarding tendon inservice inspections.

Very truly yours,

Hal B. Tucker

PJN/18/sbn

Attachment

xc: Dr. J. Nelson Grace, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia' 30323

Ms. Helen Pastis Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Mr. J. C. Bryant NRC Resident Inspector Oconee Nuclear Station

870O3100027 8 7 0 3 0 2 ~ PDR ADOCK 05000270 1 PDR

OCONEE NUCLEAR STATION UNIT 2 CONTAINMENT BUILDING

TENDON SURVEILLANCE

SUMMARY

Containment Building tendon surveillance was performed on Oconee Unit 2

during the period September, 1986 through December, 1986 in accordance with

Technical Specification 4.4.2. This was the fourth inspection for the

unit, and all tendons inspected have remained in satisfactory condition.

There were no significant findings.

DISCUSSION

Nine surveillance tendons were inspected for anchorage condition and

tensioning force and, of these, one tendon in each surveillance group was

detensioned for wire removal-for wire condition inspection and destructive

examination. These tendons were then re-stressed to the as-found

configuration. One tendon shim became damaged when stressing ram pressure

was released too quickly. Although still serviceable, the shim was.

replaced to prevent further damage which would mask surveillance aspects.

The removed shim had been field modified by torch-cutting to allow.

installation on the 93 wire tendon (1D28). The replacement shim was

machined slightly for the same reason.

1) Lift-off forces remain within the acceptable range for all ,

tendons. Lift-off readings and average lift-off force per wire

are given on Tables 1 and 2. Force-time trends are shown on

Figures 1 through 10.

2) All tendons and components remain in excellent condition. Grease

coverage of components was satisfactory. No moisture was

detected. No change in grease coloring or condition was noted.

No significant change in corrosion level of anchorage components

or wires was found. .Anchorage and wire conditions are detailed

in Table 3.

3) Tensile testing performed on wire samples removed from the

designated tendons shows all wires continue to meet the

requirements of ASTM A421 to which the tendons were manufactured.

Test results are shown on Table 4.

CONCLUSION.

Based on the results of this surveillance, the Unit 2 Contairnent Building

post-tensioning system is in satisfactory condition and is capable of

continuing to perform its intended function.

TABLE 1

LIST-OFF FORCES

(KIPS)

TENDON 1974 1978 1984 1986

1D28 688/767 716 738 760/744

2D28 685 693/681 N/A N/A

2D29 N/A N/A 672/705 730

3D28 699 707 708/726 715

23V14 689/760 748 732 748/742

45V16 697 659/670 665/702 711

61V16 699 694 714/705 717

13H9 661/770 740 720 730/711

53110 691 722 654/708 699

51H9 685 679/771 750 754

NOTES: 1. All values are the average of the values obtained at each

end of the tendon.

2. Double entries.are, respectively, the as-found and as-left

values for re-tensioned tendons.

3. Lift-off forces prior to 1984 were computed from ram area.

No calibration data for these years are available.

TABLE 2

AVERAGE LIFT OFF

FORCE PER WIRE

TENDON FORCE (KIPS)

1D28 8.26

2D29 8.20

3D28 7.77

23V14 8.13

45V16 7.73

61V16 7.80

13H9 7.93

53H10 7.68

51H9 8.19

TABLE 3

TENDON COMPONENT CONDITION

TENDON WIRES BUTTONHEADS WASHERS SHIMS BEARING PLATE

1D28 A A B B B

2D29 N/A A B B B

3D28 N/A A B B B

13H9 A A B B B

51H9 N/A A B B B

53H10. N/A A B B B

23V14 A A B B B

45V16 N/A A B B B

61V16 N/A A B B B

CORROSION LEVELS

A Bright metal, no visible oxidation

B Reddish brown color, no pitting

C 0 < Pitting < .003"

D .003" < Pitting < .006"

E .006" < Pitting < .010"

TABLE 4

TENDON TENSILE DATA

% Elongation Maximum Ultimate Sample Diameter (8 in. Gage) Load (lbs.) Strength (PSI)

13H9 End A (1) .2504" (2) 12,420 253,470 13H9 End A .2503" 5.0 12,400 253,060 13H9 Middle .2498" 5.0 12,680 258,780 13H9 Middle .2500" 5.0 12,580 256,730 13H9 End b (1) .2501" 5.4 12,900 263,270 13H9 End B .2500" 5.1 12,400 253,060 1D28 End B .2497" 5.0 12,760 260,410 1D28 End B .2498" 5.0 12,760- 260,410 1D28 Middle .2503" 3.9 12,390 252,860 1D28 Middle .2503" (3) 12,380 252,650 1D28 End A .2497" 4.9 (4) 12,790 261,020 1D28 End A (1) .2498" 5.6 12,840 262,040 23V14 Middle .2500" 5.0 12,260 250,200 23V14 Middle .2500" 3.8 12,400 253,060 23V14 Bottom .2498" 4.8 12,440 253,880 23V14 Bottom .2497" 4.0 12,400 253,060 23V14 Top .2500" 5.0 12,440 253,880 23V14 Top .2500" 4.9 12,440 253,880

(1) Original specimen bowed. (2) Specimen broke in grips, outside of gage marks. (3) Specimen broke outside gage marks. (4) Specimen broke just inside gage marks.

NOTE: Testing performed by Duke Power Company Physical Science Center

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