ML17255A763

Re Ginna Nuclear Power Station Containment Vessel Tendons Load Cell Evaluation.

ML17255A763
Person / Time
Site:	Ginna
Issue date:	03/31/1984
From:	Chen C, Demoss G, Fulton J GILBERT/COMMONWEALTH, INC. (FORMERLY GILBERT ASSOCIAT
To:
Shared Package
ML17255A762	List: ML17255A761 ML17255A763
References
2521, NUDOCS 8404160175
Download: ML17255A763 (36)

Text

GAI REPORT NO. 2521 March, 1984 ROBERT E. GINNA NUCLEAR POWER STATION CONTAINMENT VESSEL TENDONS LOAD CELL EVALUATION PREPARED FOR:

ROCHESTER GAS AND ELECTRIC COMPANY NRIYYEN BY:

G. T. DeMoss/J. F. Fult n REVIEWED BY:

J.- C."'er.

APPROVED BY:

C, Ch

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TABLE OF CONTENTS SECTION TITLE PAGE

1.0 INTRODUCTION

2.0 EVALUATION PROCEDURE 3.0 RESULTS OF EVALUATION

4.0 CONCLUSION

S

5.0 REFERENCES

TABLES Table 1 - Force and Temperature Data Tendon 13 Table 2 Force and Temperature Data Tendon 53 Table 3 Force and Temperature Data Tendon 93 Table 4 Force and Temperature Data Tendon 133 FIGURES Figure 1 Temperatures vs Time Tendon 13 Figure 2 Temperatures vs Time Tendon 53 Figure 3 - Temperatures vs Time Tendon 93 Figure 4 - Temperatures vs Time Tendon 126 Figure 5 Temperatures vs Time- Tendon 133 Tendon 13 Figure 6a & 6b Conduit Internal Temperature vs Force Figure 7a & 7b Conduit Internal Temperature vs Force - Tendon 53 Tendon 93 Figure 8a & Bb Conduit Internal Temperature vs Force Figure 9a & 9b Conduit Internal Temperature vs Force - Tendon 133 Figure 10 Monthly Average Force vs Time Tendon 13 Figure ll - Monthly Average Force vs Time Tendon 53 Figure 12 Monthly Average Force vs Time Tendon 93 Figure 13 Monthly Average Force vs Time Tendon 133 Figure 14 Tendon Locations S'there /Commonwealth

1.0 INTRODUCTION

The NRC requested RG&E to establish a short term tendon force monitoring program following the 1980 tendon retensioning program to ensure tendon prestress levels prior to the scheduled July 1981 surveillance. The program actually started in March, 1981 using four 800,000 pound capacity split load cells which had been installed in April, 1969. Their original function had been to monitor tendon force levels during the initial Structural Integrity Test. These load cells were installed beneath the anchorages of tendons 13, 53, 93 and 133.

In addition to the force monitoring, RG&E also instituted a temperature monitoring program. This was to determine the effect of seasonal variations on tendon forces. Thermocouples were installed in each of five tendon conduits (the four tendons previously mentioned plus tendon 126) about two feet down from the top anchorage. Thermocouples were also installed on the exterior surface of the containment building wall adjacent to each of five tendons. Tendon 126, although not having a load cell, the'bove was included in the temperature monitoring because it passes around a steam line penetration, as does tendon 53.

The long term monitoring program began in August 1981, following calibration of the load cells during the July, 1981 surveillance, and was concluded in July, 1982.

2.0 EVALUATION PROCEDURE Five variables were presented in the field data supplied for the evaluation (Reference 1):

a. tendon conduit internal temperature

b. concrete surface temperature Qbert IComeewealS

c. containment building internal temperature

d. average outdoor ambient temperature

e. tendon force In an effort to determine the relationships between the data, the following curves were developed for each tendon:

a ~ temperature vs time

b. measured tendon force vs tendon conduit internal temperature c~ corrected tendon force vs tendon conduit internal temperature d 0 monthly average tendon force vs time 3.0 RESULTS OF EVALUATION a ~ Temperature vs Time (Figures 1 through 5) These figures indicate that, for tendons 13, 93 and 133, the tendon conduit internal temperature closely follows the concrete surface temperature and the outside ambient temperature. The conduit internal temperature, being measured at an elevation where the containment is exposed to outside ambient temperature, is not significantly affected by the containment temperature.

For tendons 53 and 126, which are both adjacent to steam penetrations, the conduit internal temperature still basically follows the variations in concrete surface and outdoor temperatures but is somewhat higher in temperature, as would be expected.

It is expected that temperatures further down in each conduit, below the adjacent building roofs, would show less variation with the outside ambient temperature. The temperatures at these locations would be higher, being close to the average of the temperatures inside the containment and the adjacent building.

b. Measured Tendon Force vs Conduit Internal Temperature l

(Figures 6b through 9b) Since tendon 126 had no load cell, Qbert ICommonweaIth

it is not included in these figures. For the remaining four tendons (with load cells), the plotted data are scattered, but the data does display the trend of a reduction in tendon force with increasing temperature. It is noted that, since the data covers a twelve month period, the tendon forces are being affected not only by temperature, but by stress relaxation as well. To see the effect of temperature only on the tendon force, the stress relaxation losses over the period of interest must be added to the load cell values.

In order to establish the approximate amount of stress relaxation experienced by each of these tendons over the one-year period, two data sets of equal temperature, as many months apart as possible, were selected for each tendon.

From the differences in the force readings, monthly rates of stress relaxation loss were derived and applied to the load cell force readings. Tables 1, 2, 3 and 4 are included to show the tabulation of these values.

c- Corrected Tendon Force vs Tendon Conduit Internal Temp.

(Figures 6a through 9a) Once the tendon forces have been corrected for stress relaxation and are then plotted against temperature, a more linear relationship between tendon force and conduit internal temperature becomes apparent. For the four tendons for which force and temperature was available, the tendon force reduces by about 2 kips for each 10 F increase in the internal temperature of the tendon conduit within the temperature range of available data.

It should be noted that only a small vertical portion (17 ft.

average) of the exterior wall is exposed to outside ambient air temperatures, with the balance (94 ft. average) being adjacent to the interior areas of other buildings.

Calculations show that if the full Length of the tendons were subjected to the temperature change recorded by the conduit Qbert /Commonwealth

internal thermocouples, the force change would be about an 8 kips reduction for each 10oF increase in tendon conduit internal temperature.

d. Monthly Average Tendon Force vs Time (Figures 10 through 13)

The tendon load cells were read on the 10th, 20th and 30th of each month (Reference 1). The average of the three values of tendon forces measured each month are plotted as solid dots against time. The result is a curve showing basically a constant or even a slightly increasing tendon force as the testing program progressed from warm weather (Aug. '81) through the winter months up to about April 1982. This trend occurs because the stress relaxation of the tendon is offset by the general trend of decreasing ambient temperatures.

Beyond April 1982 the tendon forces fall off as warm weather is encountered. The average tendon force reduced by 15 kips from April 1982 to July 1982, and most of this decline can be attributed to temperature, as discussed below.

The monthly average of the tendon forces has been corrected for stress relaxation in Tables 1, 2, 3 and 4 and entered on Figures 10, 11, 12 and 13 as "X"s. The corrected curves show an average increase in tendon force of 5 kips, which is associated with the decreasing temperature trend as the testing progressed from August 1981 to April 1982. There is an average loss of force of 12 kips as warmer months were again encountered from April 1982 to July 1982. Therefore, of the 15 kips average force Loss over this latter period, 12 kips on the average is due to the general increase in ambient temperature which occurred.

4.0 CONCLUSION

S The load cell results indicate that the tendon forces were reasonably stable over the period from August 1981 to July 1982, and no abnormal force Losses occurred. Most of the fluctuation in Gilbert/Comnenwealth

g t measured force during this period can be attributed to seasonal variations in outside air temperature.

The results indicate that a tendon could exhibit a force loss as large as 16 kips between two measurements taken first in Winter and then in Summer, and most of this loss would relate to temperature. An approximation of the temperature effect is that tendon force is inversely proportional to temperature, and the tendon force declines about 2 k'ips for each 10 F increase in outside monthly average ambient temperature.

5.0 REFERENCES

1. Ginna Containment Vessel, TENDON LOAD CELL MONITORING REPORT, Jan., 1984. Letter from C.A. Forbes (RG&E) to D.R. Campbell, dated February 2, 1984 (13NI-RG-L0627).

Qbert/Commonwealth

TABLE 1 Force and Temperature Data Tendon 13 t'10'O'Cl i& l'1ea.."- . TIerI)P . Str em=- F+>>Pi F+SR

'i"OIR FQl~I.e peg. F I~)p $ q wr <Kr Five.

stark F ':K) SPi 4 K) :K) 8 714 li I' 4 8 P] If.

8 ri8 718 8 786 8 786 1 r'88 1 789 1 7rjp >>9 r89 1 68 7l19

Qc 55 2 ;i>>

'.7 718 2 712 711 "18 2 712 r lri 51 rL 718 '5 l ~t y

713 714 71 c$ 1 3 715 4 r18 714 718 VI 4 I 14 714 4 ) 4 41 714 5 718 w7 '5 71) I 3 718 715 I 15 I~ 718 ~I 71' r88 5 1~3 786 +I 711 712 6 ;86 5 711 7 788 714 I

r 6. 712 713 7 78I6 l2 8 .lf8 >>I 8

Pp )

71~:

ip r rj6 I 713 r86 I r

782 64 718 8 718 718 9 I Pf (>> 718 18 ",8'88 c3 788 18 f.s -rrj8 8M 18 Cg 786 11 694 91 783 il 11 698 69/

9'5 86 CI 699 I 83 78 '

pP TABLE 2 Force and Temperature Data Tendon 53 I'1c Rs. TBNP. S'~rl p.~s F+SR F+SR FrJl'r s ile9. F Rr= 1 ax. (K) O'Fr=.

F (K) SR (K) (K) fg 738 76 738 8 82 ry (~b I7 J IPh 8 724 86 8 4 l 64 1 721 1 726 I 1 (I7 ( 725 l (~bI7 70

'76 l 727 f~ss

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5J 1 F29 7 -'8 '5c 1 72 l (7Q 7 (28 64 1 729 738 C'L 2 7 2 3 2 738 7~1 3 728 7'8 4 (28 41

.I Py Q

4 728 Ap 731 46 7'2 I

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ge wp2 734

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724 69 729 1 24 J 729 I 2'3 9 772 (3 M Jg 1 l3 728 ( w8 726 18 6 776 18 728 8 726 li li 714 716 91 (

~l 721 I 23 722 ll 716 I

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hi TABLE 3 Force and Temperature Data Tendon 93 f'lontl i= flea . O't P,P F+SR t I"oft Force TeNF' V'V',"e'La~.

F~r P Rve.

SYRI'~ F (lz) De9. F SR (K) r,K) rk) 8 r82 P wy 8 , 82 8I i A 8 696 r8 rj 696 73 1 699 1 64 1 698 64 1 699 2 698 55 1 699 2 r r.c 1 781 2 8'8'88 55 1 781 VQ V'i 55 2 r82 788 46 2 782 78?

782 4c ~

784 4 782 37 r84 782 46 2 784 784 4 782 2 r84 5 785 5 784 ng I

Vy I r8, 5 r84 784 v g7 4 ~8Q 6 782 ~C 786 787 lg 782 g Vg 786 r r82 41 786 r r82 41 %8 (85 r 788 4 784 8 r82 5 787

~r  ; 8c< 58 5 785 38

, 88 64 785 9 5 699 694 ~f Pga 699 c <g'9 73 F/9 18 692 78 698 V y~

18 82 6 698 r J,8 91 ll ll 688 6P~6 95 91 F

7 7

695 11 95 7 693

~A~LF~4 Force and Temperature Data Tendon 133 t'ion ths P1ea"=. F+SR f"t"0 Fql rP Temp . F+ P Il Ave.

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1 69 1 I 23

'7t II II 72 1 722 55 1 iC 2 722 55 2 724 24 (24 7 r2 58 2 724 722 51 (24 3' (22 51 II r'4 (-5 724 41 2 726 42 3 722 37 3 725 41 725 5 32 4 726 rp 5 r28 ~( 4 T24 5 728 27 724 728 32 5 725 728 37 I 20 ( I I 6 rc'"'8 Pg 5 I 25 r 728 32 726 m Pg I r28 41 6 726 (~o 7 728 ar 6 726 IQ I~ T28 n2 726 Pg T28 46 726 IQ I/I 728 726 9 7],6 64 I 723 9 716 69 7 723 716 (3 7 (~i l.8 ~il 4 73 722 1n 18

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