ML17257A525
| ML17257A525 | |
| Person / Time | |
|---|---|
| Site: | Ginna  |
| Issue date: | 07/29/1981 |
| From: | Maier J ROCHESTER GAS & ELECTRIC CORP. |
| To: | Crutchfield D Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 8108100344 | |
| Download: ML17257A525 (6) | |
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ACCESSION NBR:81081003rfrf DOC ~ DATE: 81/07/29 NOTARIZED:
NO DOGKE>>T. ¹ FACIL'I:50-24rf Robert Emmet Ginna Nuclear Planti Unit Ii Rochester G
050002rfrf AOTH ~ AAHE 'UTHOR AFFILiATION NAIER p J ~ E, Baltimore Gas L Electric Co, RECIP ~ NANEr RECIPIENT AFFII.IATION CRUTCHF IELO g D ~
Operating Reactors Branch 5
SUBJECT:
Discusses resu,its-of containment surveillance
- program, conducted on 810713 22'.Detailed evaluation will be, submitted by 810930.
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89 EAST AVENUE,ROCHESTER,H Y.F.4649 JOHN E.
MAIER VICE PRESIDENT TELEPHONE AFFEA CDDK TIO 546.2700 July 29, 1981 Director of Nuclear Reactor Regulation Attention:
Mr. Dennis M. Crutchfield, Chief Operating Reactors Branch No.
5 U.
S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
Containment Tendon Surveillance Program R. E. Ginna Nuclear Power Plant Docket No. 50-244 FIUG 0 "C 1981 t Lt~ggggg laaeATOII J 7 gDANI5$N
Dear Mr. Crutchfield:
The 1981 Tendon Surveillance began on July 13th and was completed on July 22nd.
A total of eighteen (18) tendons were tested to determine their current liftoff force.
None of the tendons were found to have a force level less than the technical specification limit of 636 kips.
The average tendon force was 714.5 kips which was derived from a weighted average of fourteen (14) tendons retensioned in June 1980 and four (4) tendons retensioned at 1000 hours0.0116 days <br />0.278 hours <br />0.00165 weeks <br />3.805e-4 months <br /> after initial stressing.
The attached Table 1 lists for each tendon the last lock off force, predicted and measured liftoff force and a ratio of measured over predicted liftoff force.
Predicted liftoff forces were based on curves of tendon losses from initial pre-stressing to the retensioning in June 1980.
Two (2) load cells were reinstalled under tendon heads 93 and 133 and later calibrated.
The remaining two (2) load cells under tendon heads 13 and 63 were recalibrated to check the previous calibrations.
All four load cells are currently functioning and monitoring tendon forces.
A detailed evaluation of the tendon surveillance results will be presented in a final report of the Ginna Tendon Evaluation.
This report will be submitted by about September 30, 1981.
Very truly yours, n E. Maier Attachment 8108100344 810729 PDR ADQCK 05000244 PDR
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TABLE 1 Tendon Surveillance Results Tendon No.
13 155 17 21 51 53 62 63 74 76 84 93 125 133 33 36 111 116 Sece.
1 2
3 5
6 7
8 9
10 11 12 13=
14 15 16 17 18 Lock Off (Last)
~Ki s 761 754 776 765 765 761 773 769 746 754 753 761 ',
768 757
-770 763 744 757 Predicted Lift Off Ki s 737 745 760 749 748 742 754 740 680 729 732 740 755 734 655 667 637 634 Measured LiftOff
~Ki s 730 738 727 725 710 734 716 722 731 713
>>714 ',
g'7 13
'a 705 734 679 657 646 690 Measured Preda.cted 0.991 0.991 0.957 0.968 0.949 0.989 0.950 0.976 1.075 0.978 0.975 0.964 0.934 1.000 1.037 0.985 1.014 1.088
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