ML20062B535

Forwards Updated Piezometer & Settlement Readings for Svc Water Pumphouse & Intake Structure,Updating Rept, Svc Water Intake Structure Settlement Effects & Related Work, Submitted on 780710

ML20062B535
Person / Time
Site:	Summer
Issue date:	10/27/1978
From:	Crews E SOUTH CAROLINA ELECTRIC & GAS CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NUDOCS 7810310083
Download: ML20062B535 (10)

Text

{{#Wiki_filter:._ .,i SOUTH CAROLINA ELECTRIC & GAS COMPANY nos, amer.o= ve. COLUMBIA. SOUTH CAROLINA 29218 E.H. Ca rws, J n. vico.u.u.....o .cuev1.. October 27, 1978 - ~ .s c. .u. ... c.. c,. t Mr. Harold R. Deo'on, Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Subject:

Virgil C. er Nuc ear Station Docket No 50-3'95 Update for Report No. 2 Service Water Intake Structure Settlement Effects and Related Work

Dear Mr. Denton:

South Carolina Electric & Gas Company, acting for itself and as agent for South Carolina Public Service Authority, herewith files forty-three (43) copies of updated piezometer and settlement readings for the service water pumphouse and intake structure. This trans-mittal is issued as an update to the report entitled " Report No. 2, Service Water Intake Structure Settlement Effects and Related Work" which was submitted to NRC n July 10, 1978. The material submitted contains three (3) signed iginaftransmittallettersandforty(40) conformed copies thereof. ~ V ry rul

yours, E. ". m i 1.

t l EHCJr:RBW:rh I cc: H. T. Babb G. H. Fischer W. C. Mescher W. A. Williams, Jr. W. S. Murphy T. B. Conner, Jr. B. A. Bursey I NPCF/Dixon l File 78103100U \\ l ) 1

Co'fiA*O*ng Woodward Clyde Consultants Pennsylvania 19482 October 23, 1978 215-e25-3000 reier 848-343 71 C 72 South Carolina Electric & Gas Company Post Office Box 764 Columbia, South Carolina 29218 Attention: Mr. Robert Whorton Re: Piezometer and Settlement Readings Service Water Pumphouse and Intake Structure Virgil C. Summer Nuclear Station Gentlemen: Enclosed herewith is the following data in connection with the Service Water Intake Structure and Pumphouse at the Virgil C. Summer Nuclear Station: Table 3A: Pumphouse settlement readings from June 6, 1978 through October 11, 1978. This table is a continuation of Table 3 in Report No. 2, Service Water Intake Structure, Settlement Effects And Related Work, dated June 28, 1978. Table 10A: Intake Structure settlement mast readings f rom June 6, 1978 through October 11, 1978. This is a continuation of Table 10 in the report. Table ll: Readings through October 6, 1978 of piezo-(, meters which were installed in the West Embankment in August, 1978. Figure 9A: A new figure showing the movement since January, 1978 of Pumphouse Settlement Points A, B, C and D at an expanded scale. l Figure 24: Figure taken from the Settlement Report showing movement of the Intake Structure Monitoring Masts has been updated l through October 11, 1978. F_igure 25: A new figure showing the locations and pro-files of the new piezometers. 1 Figure 26: A new figure showing the piezometer data through October 6, 1978. The settlement data indicates that after some initial downward movement due to filling the Service Water Pond in February and March, 1978 the Pumphouse rebounded approximately 0.5 inches from Consuting Engineers.deologists and EnvironmentalScientists Offices in Ctner Pnncipal Cities

Woodward.Clyde Consultants South Carolina Electric & Gas Company October 23, 1978 Page two March to June. From June through October the rebound has been less than 0.1 inches and appears to have essentially ceased. The monitoring masts indicate that the Intake Structure also rebounded about 0.5 inches between March and June, 1978, and less than 0.2 inches between June and October. The piezometer data shows that the groundwater elevation increases with distance from the Service Water Pond. This indicates that the fill is probably being saturated by a gradual rising of the groundwater f rom within the natural ground beneath the fill in reponse to the filling of Monticello Reservoir and the li' Service Water Pond. This is also indicated at the two locations (- where piezometers are installed at two levels. In both of these cases, the lower level piezometer shows a higher piezometric level, indicating an upward gradient in the groundwater flow. I If we may provide any additional information, please do not hesitate to contact us. Very truly yours, WOO WARD-CLYDE CONSULTANTS Frank S. Waller, P.E. Principal AHD/b Enclosures (75 copies) cc: Mr. James L. Harris Dr. M. Ayub Iqbal Mr. James E. Lisney Dr. Arthur H. Dvinoff Master File 6.9

(~. ( i TABLE 3A

SUMMARY

OF SERVICE WATER PUMPHOUSE SLfTLEMENT READINGS APPR0XIMATE MEASURED SETTLEMENT (inches) DATE FILL CONCRETE A B C D ELEVATION ELEVATION 6/07/78 435 459 11.988 11.352 12.336 13.128 6/14/78 435 459 12.036 11.412 12.408 13.188 6/ 21/78 435 459 12.000 11.304 12.324 13.104 6/20/78 435 459 12.024 11.412 12.444 13.164 7/05/78 435 459 11.976 11.424 12.408 13.104 7/12/78 435 459 11.964 11.340 12.360 13.092 7/19/78 435 459 11.976 11.364 12.336 13.044 7/26/78 435 459 12.048 11.412 12.396 13.104 8/02/78 435 459 12.048 11.388 12.372 13.080 8/09/78 435 459 11.916 11.316 12.312 13.008 8/16/78 435 459 11.976 11.376 12.372 13.068 8/23/78 435 459 11.964 11.256 12.240 13.056 8/28/78 435 459 11.964 11.376 12.360 13.068 8/30/78 435 459 11.940 11.376 12.324 13.032 8/31/78 435 459 11.916 11.328 12.300 13.020 9/05/78 435 459 11.988 11.364 12.360 13.092 9/07/78 435 459 12.000 11.340 12.336 13.068 9/11/78 435 459 11.880 11.268 12.288 12.996 9/14/78 435 459 11.940 11.304 12.288 13.056 9/18/78 435 459 11 '28 11.328 12.300 13.020 9/19/78 435 459 11.916 11.316 12.312 13.008 9/21/78 435 459 11.940 11.340 12.312 13.056 9/27/78 435 459 11.964 11.304 12.276 13.068 10/04/78 435 459 11.976 11.376 12.360 13.080 10/11/78 435 459 11.952 11.376 12.360 13.080

TABLE 10A l SETTLEMENT READINGS SERVICE WATER INTAKE STRUCTURE MASTS i l Elevation Settlement (inches) Date of Service 4ast No. I Mast No. 2 Mast No. 3 Water Pond 4 6/07/78 424.1 -0.02 -0.19 -0.29 6/14/78 423.8 0.01 -0.17 -0.24 6/21/78 422.6 -0.08 -0.25 -0.28 6/28/78 422.4 0.00 -0.17 -0.24 7/05/78 424.6 -0.05 -0.20 -0.30 7/12/78 422.6 -0.08 -0.24 -0.34 7/19/78 423.0 -0.01 -0.25 -0.31 7/26/78 422.4 0.01 -0.25 -0.28 8/02/78 422.6 0.01 -0.23 -0.28 8/09/78 422.7 -0.10 -0.34 -0.38 8/16/78 421.9 -0.08 -0.31 -0.37 8/23/78 421.0 -0.08 -0.35 -0.34 8/28/78 422.8 -0.05 -0.31 -0.31 8/30/78 422.8 -0.08 -0.37 -0.35 8/31/78 422.2 -0.12 -0.36 -0.35 4 9/05/78 421.9 -0.06 -0.32 -0.30 9/07/78 421.7 -0.06 -0.32 -0.30 9/11/78 4 21.6 -0.12 -0.40 -0.38 9/14/78 421.4 -0.10 -0.38 -0.34 9/18/78 421.2 -0.12 -0.38 -0.37 9/19/78 421.1 -0.07 -0.35 -0.37 9/21/78 4 21. 0 -0.11 -0.37 -0.32 9/27/78 420.9 -0.07 -0.35 - 0. 31 10/04/78 420.9 -0.08 -0.37 -0.34 10/11/78 420.9 -0.05 -0.37 -0.35 I '~~~7

l' TABLE 11 i' WEST EMBANKMENT PIEZOMETER DATA PIEZOMETER NUMBER: WE-8 WE-9 WE-9A WE-10 WE-ll WE-12 WE-12A WE-13 TIP ELEVATION: 377.3 371.3 383.1 406.6 411.4 375.2 385.1 402.3 DATE ELEVATION OF WATER LEVEL 8/17/78 Dry 405.9 403.3 398.8 Dry 8/18/78 378.6 405.9 403.0 408.0 412.8 408.8 386.4 Dry 8/21/78 381.4 407.6 402.5 414.3 418.7 409.2 386.5 Dry 8/23/78 383.7 406.6 402.4 413.8 418.8 409.6 387.2 Dry 8/25/78 385.8 406.8 402.4 414.6 419.1 409.7 387.7 Dry 8/28/78 386.8 407.0 402.2 414.4 419.0 409.9 389.5 Dry 8/30/78 386.9 407.1 402.2 414.4 419.0 410.0 388.8 Dry 9/01/78 387.2 406.9 402.1 414.9 418.7 410.0 389.0 Dry () 9/06/78 288.0 407.0 402.0 415.1 418.7 410.1 389.8 Dry 9/08/78 388.4 407.0 402.0 415.3 418.8 410.5 390.1 Dry 9/14/78 389.0 406.7 401.7 414.6 418.4 410.4 390.6 Dry 9/21/78 390.0 406.8 401.7 415.6 418.3 410.6 391.2 Dry 9/28/78 391.9 407.3 402.1 416.0 418.3 410.7 391.8 Dry 10/06/78 392.2 407.5 402.2 413.9 418.2 414.4 392.5 Dry

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