ML20023D133
| ML20023D133 | |
| Person / Time | |
|---|---|
| Site: | Midland |
| Issue date: | 05/05/1983 |
| From: | Meisenheimer J, Wieland R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.) |
| To: | |
| Shared Package | |
| ML20023D130 | List: |
| References | |
| NUDOCS 8305190284 | |
| Download: ML20023D133 (8) | |
Text
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Paga 1 of 2 Midland Energy Center Consumers Power Company EVALUATION OF PRESSURES IN LINES OF GROUTING EQUIPMENT CRACK REPAIR BWST FOUNDATIONS Requested By: NRC Region III Report Date: 5/5/83 Report By: J.K.Meisenheimer, MPQAD Soils R.H.Wieland, SMO (h h if i /0h3 INTRODUCTION This report is in response to the NRC unresolved item (329/82-18-04; 330/82-18-03) presented in the NRC Region III letter January 18, 1983 from R F Warnick to J W Cook, Consumers Power Company. Additional calibration tests were performed using pressure gauges on both pressure lines of grouting equipment used for crack repair of the borated water storage tank (BWST) foundations. The results of these tests are in-cluded in the following sections of this report.
CONCLUSIONS Results of tests performed on February 24, 1983 indicate that the pressure in both lines of the grout mixing equipment remains the same during grout injection operation.
Calibrated pressure gauges were attached to both lines going to the epoxy grout mixing gun and injection nozzle. Pressures in the lines and mixing gun were controlled by a valve in the injection nozzle. With every pressure adjustment and fluctuation, the gauges for each line always indicated identical pressures. The pressure in both gauges rose and dropped together, with no lag indicated between lines.
The results of this study indicate that a pressure reading from a single gauge installed on any one of the grout lines would be indicative of the pressure in both lines as well as pressures in the mixing gun.
INVESTICATIVE STUDY General l
On February 24, 1983, R H Wieland, CP Co SMO, J K Meisenheimer, CP Co MPQAD Soils and H E Entrekin,Bechtel, conducted the investigative study at Structural Bonding Company, Inc facilities in Flint, Michigan. Bechtel provided calibrated prcssure gauges and measuring cylinders used to calibrate equipment. Structural Bonding Company provided the epoxy grout, pumping equipment, and mixing gun used for the study. All instructions for conducting the study, data collection, witnessing of the results and analysis was performed by the CP Co representatives. The following sections provide details of the study conducted and the results.
Grout Pumping Equipment The grout pumping equipment used for this study is the same type that was used for crack repair'of the BWST foundation. According to Structural Bonding Company records, j the equipment (Unit No 18) used for this study was the same unit used at the Midland Plant.
8305190284 830512 PDR ADOCK 05000329 A PER
- Pags 2 of 2 I ,The'A andLB' components of;the epoxy grout are fed _to the pressure lines by positive
. displacement gear. pumps _ driven by-the same electric motor. Mixing ratios are con-
_ trolled by varying the' size of sprockets used to drive the pumps. Refer to Photo-J graph 1 for(the grout pumping equipmen't used _ and Photograph 2 for typical positive
' displacement pump used. ;
Y Calibration of Pumps
,' 'The~ pumps were calibrated to. verify that required mixing ratios were obtained while
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p operating .within backpressures ranging from 0 to 160 psi.
The Bech"tel approved Procedure for_ Grouting Cracks in the_ Borated Water Storage Tank
. Foundation Ri~ng Wall,1 FSC-426-1-1 was . used to calibrate the pumping equipment. Section
-3.3.2.1.of the Guideline Specification Structural Concrete Donding Process was used to_ test for proper ratio. Exception to the-procedure was taken for testing at the maximum _ discharge pressure of,200 psi. Since the calibrated gauges had a maximum capacity of 200 psi, the maximum test pressure-for calibration was maintained at E
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approximately 185 psi, which is well above the maximum allowable grouting pressure of 160 psi. The same type of epoxy grout admixtures A and B used for crack repair i
of the BWST foundation was utilized for this study, CONCRESIVE:1380, Lot 28306, from
-Adhesive Engineering Company.
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' Calibrated _ pressure gauges and graduated cylinders provided by Bechtel were used for mix ratio calibration. The grout lines were calibrated at 0 psi and 185 psi line i pressures. The valves for both the A~and B lines had to have minor adjustments during calibration to maintain the higher pressure at steady level. The line pressures were both maintained at approximately_185 psi, but'would fluctuate between 180 to 190 psi
- t. ~during the test. _The required mixing ratio was maintained within a tolerance of iS%
by volume. Refer to Photographs 3 through 6, calibration at 0~and 185 psi. Data and test-results are presented on Test Data Sheet.
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1 Calibration Line Pressures Two calibrated pressure gauges were attached to the mixing gun and injection nozzle.
(Refer to Photograph No 7). With both grout lines attached to-the mixing gun, the pressure in both lines was monitored as the valve in the injection nozzle was adjusted to change pressure within the system. Adjustment of the nozzle valve simulated flow P
~ restrictions'that occur during actual grouting operations causing backpressure fluc-tuations within the sytem.
With the nozzle valve wide open, a backpressure in the lines of approximately 28 psi
.was observed and recorded for the gauges on both lines. The valve was adjusted so the system was operating at approximately 100 psi and again adjusted so the system i .was operating at approximately 160 psi.
.With every pressure' adjustment and fluctuation, the gauges in each line always indicated'the identical pressures. The pressure in both gauges rose and dropped together, with~no lag indicated between lines. Refer to Photographs 8 through 10 for pressures in lines when operating at steady pressure.
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TEST REPORT SHEET Prepared By: Date(/4)#$
Checked By / Date 0[86 TEST LOCATION All data from: Field Test Data Sheet dated 2/24/83 Structural Bonding Company - Flint, Michigan Prepared by J K Meisenheimer TEST STUDY'
' Calibration grout equipment used for BWST foundation crack repair.
UNIT - No; 18, positive displacement pump MATERIAL -Concresive 1380, Lot 82306 Adhesive Engineering Company
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CALIBRATION GAUGES AND GRADUATED CYLINDERS Supplied by Bec'tel h and Calibrated by U.S. Testing Test Used Gauge No. BPCM1194(200 psi) Cal. Due'Date 5-23-83 (A-Component)
Gauge No. BPCM1190(200 psi) Cal. Due Date 5-23-83 (B-Component) 1000 ml. cylinder no. 525 Cal. Due Date 2-23-84 (o psi) 500 ml. cylinder no. '745 Cal. Due Date 2-23-84 (o psi)
.1000 ml. cylinder no. 574 Cal. Due Date 2-23-84 (185 psi) 500 ml. cylinder no. 744 Cal. Due Date 2-23-84 (185 psi)
RATIO TEST Volume 15% deviation Ratio 2:1 0 psi component A 1005'ml. satisfactory satisfactory component B 503*ml.
'(photograph No. 4)
-185 psi- component A .1000*ml. satisfactory satisfactory component B 503*ml.
(photograph No. 6)
- Estimated Volume using calibration marks on cylinders.
._ MIXING GUN AND PRESSURE LINE TESTS PHOTO NO.
1.- Mixing gun and nozzle with pressure gauges mounted 7
.2. Valve on nozzle open - pressure both lines *28 psi 8 3 Valve closed to maintain pressure at 98-100 psi - both lines same 9 4 Valve closed to maintain pressure at a 160 psi - both lines same 10 Note: Both gauges raise and drop together with pressure adjustment.
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