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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SECTION TABLE OF CONTENTS TITLE PAGE

1.0 INTRODUCTION

2.0 EVALUATION PROCEDURE 3.0 4.0 5.0 RESULTS OF EVALUATION CONCLUSIONS REFERENCES TABLES Table Table Table Table 1 - Force and Temperature Data Tendon 13 2 Force and Temperature Data Tendon 53 3 Force and Temperature Data Tendon 93 4 Force and Temperature Data Tendon 133 FIGURES Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure Figure 1

Temperatures vs Time 2 Temperatures vs Time 3 - Temperatures vs Time 4 - Temperatures vs Time 5 Temperatures vs Time-6a

& 6b Conduit Internal 7a

& 7b Conduit Internal 8a

& Bb Conduit Internal 9a

& 9b Conduit Internal 10 Monthly Average Force ll - Monthly Average Force 12 Monthly Average Force 13 Monthly Average Force 14 Tendon Locations Tendon 13 Tendon 53 Tendon 93 Tendon 126 Tendon 133 Temperature vs Force Tendon 13 Temperature vs Force - Tendon 53 Temperature vs Force Tendon 93 Temperature vs Force - Tendon 133 vs Time Tendon 13 vs Time Tendon 53 vs Time Tendon 93 vs Time Tendon 133 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 the'bove five tendons.

Tendon 126, although not having a load cell, 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 ~

d 0 corrected tendon force vs tendon conduit internal temperature 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

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Force TABLE 2 and Temperature Data Tendon 53 fg 8

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~A~LF~4 Force and Temperature Data Tendon 133 ths t'ion f"t"0

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