ML20084L032

Soniscope Investigation of Turkey Point Plant Unit 3 Containment Mat

ML20084L032
Person / Time
Site:	Turkey Point
Issue date:	05/29/1969
From:	Whitehurst E AFFILIATION NOT ASSIGNED
To:
Shared Package
ML17198A202	List: ML20084L029 ML20084L032 ML20084L206 ML20084L209 ML20084L812
References
NUDOCS 8305200142
Download: ML20084L032 (8)

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, AN n IEBL j 1970,s yNISCOPE INVESTIGATION OF THE TURKEY P d p }.g:4, -

UNIT NO. 3 CONTAINMENT MAT ffi27,

%/ (3 INTRODUCTION s

In accordance with an agreement for consulting services between the undersigned and Bechtel Corporation, Soniscope tests have been performed on Section 6-l' of the containment mat of the No. 3 Unit of the' Turkey Point Plant, located near Homestead, Florida. All testing was accomplished on Monday, ,

May 26, ' 196 9.

In a previous report to Becntel, dated April 30, 1968, describing the '

original testing of the containment mat of the No. 3 Unit of this plant, the test equipment and procedure used in performing these tests were described in detail.

The report also provided information concerning the extent of, and limitations of, usefulness of this testing approach, and described procedures for analysing the

' data collected during such tests. For such information, the reader is referred to

'that report.

The same notations were employed for identifying test positions during the testing described herein as were used to identify test positions during the original tests of this unit. Testing was limited to horizontal tests from the wall of the reactor pit liner to the outer wall of the containment mat. A total of 180 tests are described herein.

TEST RESULTS The results of all tests performed are tabulated in Table I and shown graphically in Figures 1 and 2.

Figure 1 shows the results of horizontal measurements from the wall of the reactor pit to the outer wall of the containment mat in which the transmitting transducer was moved successively in two degree increments around the outer wall of the mat. During these tests the receiver, held against the inner wall of the .

reactor pit, occupied only three different positions. Tests were made at elevations 3 ft. , 4 ft. , 5 ft. , 7 ft. , and 9 ft. A successful test was accomplished at each position occupied.

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Reference to th'e original report will show that in the earlier tests on the section at elevation 3 ft.the' re w~ere two positions (61-3 and 61-12) at which no signal was received and fifteen positions at which the received signal was too weak to be interpreted. In the tests made on May 26, 1969 all received signals were of adequate strength and the average velocity mcasured throughout the eleva-

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tion was slightly greater than the average of those velocities measured in April, 1968.

In the original tests at elevation 4 ft. , no signal was received at test position 61-1 and at position 61-22 the received signal was too weak to be inter-preted . Signals of adequate strength were received at all positions during the more

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recent tests. Velocities measured at positions from 61-1 through 61-21 were the same or a little higher than those me.asured in April,1968. A larger than average difference between adjacent readings ' occurred as the transmitting transducer was moved from position 61-22 to position 61-23, and the velocities measured from position 61-23 through 61-29 were slightly lower than those measured in 1968.

It should be noted that the receiving transducer, held against the wall of the re-actor pit, was moved 30 degrees around the wall between tests involving position 61-22 and position 61-23, and remained at the latter position through the remainder of the tests on the section. It is believed that the reduction in velocities noted from

, position 61-23 through position 61-29 at elevation 4 ft.may be attributed to a slight lessening of bond between the reactor pit liner and the containment mat at position 61-30 on the reactor pit liner. Some substantiation of this belief will be pointed out on Figure 2.

In the original tests at elevation 5 ft. , unreadably weak signals were received at test positions 61-22 through 61-29. Adequate signals were received at all of these positions during the more recent tests. Velocities measured through the section were about the same or slighgly higher at this elevation when measured in May,1969 than when measured in April,1968.

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original tests at this eleveation. No unusual variations in velocity were found.

In the original tests at elevation 9 ft. , no signal was received at test positions 61-2, 61-5, 61-8, 61-14, 61-15, 61-18, 61-19, 61-20, 61-21, and 61-22, and unreadably weak signals were received at eight other inst positions.

Successful tests were made at only twelve of the thirty test positions , in the recently completed tests, readings were completed at all thirty positions. Signals observed in these were, however, weakor than those observed in tests at the other four elevations, and the average velocity measured in the thirty tests, 13,380 ft, per second, was somewhat lower than that measured at the other elevations (13,630 ft. per second at elevation 3 ft. ,13,620 ft per second at 4 ft. ,

13,760 ft. per second at 5 ft. , and 13,850 ft, per second at 7 ft.) .

In the original report, the difficulties associated with achieving adequate test results at the 9 ft. elevation were attributed to the presence in the si,st of a shear key into which the wall would subsequently be erected. It was noted that the shear key was approximately 4 ft, deep throughout most of the section, begin-ning at about position 61-7, and was of sufficient depth to intercept the test signal. With the erection of the wall, the shear key has been 1111ed with concrete and a continuous path should be available for the test sig?al. This construction would result, however,in two vertical construction joints which would intercept the signal path, each of which would be expected to result in some attenuation of the signal. It may be noted that the velocities measured through test position 61-6 are of approximately the same level as those measured at other elevations. At test positions beyond 61-6 the velocity began to fall of f and remained lower throughout the remainder of the section. It is believed that this decrease is attribut-able to the presence of the two vertical construction joints in the signal path. The uniformity of tile velocity measured over a large porition of the slab at the 9 ft.

elevation after the general decrease in velocity had occurred suggests adequate uniformity of the concrete.

Figure 2 shows the results of supplemental horizontal tests in which the transmitting transducer was held at only two positions on the outer wall of the mat and the receiving transducer w:s wed through a succession of ten degree intervals L.

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o against the liner to the reactor pit wall. Successful tests were accomplished at all locations. In general, velocities were about the same or a~ little higher than those measured in April,1968 and variability of the readings was about the same. One difference occurred at elevation 4 ft. Involving test positions 61-20, 61-25, and 61-30. In the recent tests, the velocities measured at these positions were somewhat lower than those measured earlier, and increased as the transducer was moved away from position 61-30, reaching a high level of velocity by the time the transducer reached position 61-15. Attention is redirected to the horizontal tests at elevation 4 ft. in which all tests made to the outer wall (positions 61-23 through 61-29) for which the receiving transducer was held at position 61-30 against the reactor pit liner showed lower readings than average for that elevation. It is believed that these results substantiate the conclusion that there has been some lessening of the intimacy of bond between the reactor liner and the mat at and near position 61-30 at elevation 4 ft.

CONCLUSIONS On the basis of the testing described above and of the test results enumerated in this report, together with a comparison of the results reported under date of April 30, 1968, the following conclusions have been drawn:

(1) The degree of uniformity of the concrete throughout Section 6-1 of the containment mat is materially greater than it was at the time of the initial tests.

(2) No significant evidence of lack of uniformity, as evidenced by inability to obtain a test signal, an unreadsbly weak test signal, or abnor'.rtal variations in velocities, was discovered during these tests.

b i E. A. Whitehurst, Consulting Engineer Knoxville, Tennessee May 29,1969 L

TABLE I

• PULSE VELOCITIES MEASURED HORIZONTALLY THROUGH CONTAINMENT SLAB Transducer Positions Wall of Outer face Pulse Velocity (ft../sec.)

reactor of Path length pit slab (ft.) Elev. 3 ft. Elev. 4 ft. Elev. 5 ft. Elev. 7 ft. Elev. 9 ft.

56-30 56-30 55.0 13,600 13,630 13,850 13,990 13,550 61- 1 2

55.1 55.1 13.550 13,620 13,620 13,550 13,840 13,980 13,710 h

13,790 13,930 13,880 3 55.1 13,660 13,590 13,720 13,970 13,600 4 55.2 13,580 13,560 13,680 14,050 13,730 5 55.2 13,630 13,530 13,600 13,990 13,660 6 55.3 13,500 13,550 13,626 14,050 13,710 4'

7 55.4 13,550 13,530 13,650 14,060 13,600 8 55.5 13,590 13,520 13,600 13,980 13,600 61-15 61- 9 54.8 13,720 13,770 13,860 13,730 13,450 61-10 54.7 13,660 13,760 13,760 13,740 13,420 11 54.6 13,370 13,700 13,740 13,750 13,250 12 54.6 13,380 13,770 13,790 13,750 13,320 13 54.6 13,370 13,810 13,860 13,680 13,270 14 54.5 13,560 13,760 13,800 13,710 13,120 15 54.5 13,640 13,870 13,890 13,730 13,210 16 54.5 13,570 13,850 13,940 13,810 13,180 17 54.6 13,680 13,820 13,980 13,880 13,330 18 54.6 13,450 13,860 14,000 13,790 13,240 m

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TABLE 1 (Continued) .

PULSE VELOCITIES MEASURED HORIZONTALLY THROUGH CONTAINMENT SIAB Transducer Positions Wall of Outer face Pulse Velocity (ft./sec.)

reactor of Path length pit slab (ft .) Elev. 3 ft. Elev. 4 ft. Elev. 5 ft. Elev. 7 ft. Elev. 9 ft.

61-15 61-19 54.6 13,650 13,930 13,960 13,750 13,200 20 54.7 13,740 13,990 13,990 13,730 13,210 h 21 54.8 13,730 13,890 13,940 13,700 13,200 22 54.8 13,580 13,800 13,870 13,750 13,240 61-30 61-23 54.4 13,550 13,330 13,630 13,720 13,270 24 54.3 13,610 13,210 13,590 13,800 13,150 .

25 54.2 13,670 13,220 13,600 13,830 13,090 h

26 $4.2 13,720 13,270 13,720 13,860 13,160 -

27 54.1 13,700 13,260 13,710 13,820 13,120 28 54.1 13,710 13,290 13,750 13,890 13,040 29 54.0 13,780 13,240 13,830 13,900 13,120 61-25 61-23 54.2 13,810 13,450 13,700 13,950 13,350 61-20 54.4 13,820 13,530 13,620 13,900 13,520 61-15 54.9 13,850 13,900 13,780 14,060 13,690 61-15 61- 8 54.9 13,740 13,830 13,780 13,710 13,540 61-10 54.7 13,620 13,590 13,340 13,730 13,390 61- 5 54.9 13,730 13,610 13,590 14,090 13,380 U-