ML20214M698
| ML20214M698 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 05/22/1987 |
| From: | Bailey J GEORGIA POWER CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML20214M702 | List:
|
| References | |
| GN-1368, NUDOCS 8706010405 | |
| Download: ML20214M698 (10) | |
Text
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Georgia Pbwer Company.
1 Post Offica Box 282 Waynesboro, Georgia 30830 Telephone 404 554-9961 -
404 724 8114 Southern Company Services, Inc.
Post Office Box 2625 Birmingham, Alabama 35202 Telephone 205 8704011 VOgtie Project May 22, 1987 U.S. Nuclear Regulatory Commission File: X7BC35 Atta: Document Control Desk Log:
GN-1368 Washington, D.C.
20555 NRC DOCKET NUMBERS 50-424 AND 50-425 OPERATING LICENSE NPF-68 CONSTRUCTION PERMIT NUMBER CPPR-109 V0GTLE ELECTRIC GENERATING PLANT-UNITS 1 AND 2 SETTLEMENT MONITORING PROGRAM Gentlemen:
VEP is currently committed to reading all plant settlement markers at 60-day intervals. With the onset of the operation of Unit 1, this task has become increasingly expensive and time-consuming due to operational interferences and the installation of security barriers. We have therefore reviewed our settlement program and det. ermined that modifications can be made which will continue to provide ample data for settlement evaluation purposes while reducing the amount and difficulty of the work involved.
The proposed modifications to the settlement monitoring program are as follows:
o Change the reading frequency on 65 of the most stable markers on the Unit 1 side (at or east of the plant centerline) and six markers on the Unit 2 side, from 60-day intervals to 6-month intervals. Affected markers are located in completed areas where neither concrete placement nor backfilling have recently occurred.
o Improve the accessibility of 30 markers located in Unit 2.
This will primarily consist of moving markers currently located within the smaller category 1 structures to points on the outside of the structures but still within a few feet of the original marker location. In some cases markers will be moved to a higher elevation.
o Discontinue the readings of two markers: 423-1 and 423-lb.
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.e U.'S. Nuclear Regulatory 1 Commission File:',X7BC35-1GN 1368 May 22,-1987.
Log:-
Page 2 The justification for the. proposed reading-frequency modification is as
-follows:-
<(1).
The markers affected -(see : Table 1). are stable. :This can be verified
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by reviewing the_ settlement' drawings provided with Appendix A.
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drawings, which show'the graphical plot of settlement as a function of time,- demonstrate that the ' settlement. of. these. markers.has essentially leveled off.
(2)
Where the affected markers have been used to calculate.. differential
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settlement between structures the gross differential settlement is, low. These' low ' differentials 'are shown in Table' 2.. They are calculated.from the first date.both markers;were monitored, not merely subsequent to installation of piping.
(3)
The: differentials which have been' measured'are~substantially less than the differentials for which the piping has been analyzed.' It can be~
seen from' Table 2 that in the unifkely event that-relatively substantial differentials were to develop in the future at these interfaces, enough margin remains so that' piping would not be overstressed.
The above data demonstrate that no changes are likely to occur within a 6-month period which would affect our evaluation of the settlement data.-
The markers which will be moved to improve their accessibility will continue to provide accurate data for the portion of the structure they represent.
Their plan view location will continue to be essentially the same as shown on drawing AX2D55V001 in Appendir A so that continuity with their original locations will be preserved. Moving these marker locations. to the exterior of structures or to higher elevations will increase settlement monitoring efficiency without detracting from the accuracy of the; program.
Finally, we will discontinue reading markers 423-1 and:423-1b. Subsequent to-heavy rains and erosion in the power block backfill. in 1979 (reference Final Report en Dewatering and Repair of Erosion in Category 1 Backfill:in-Power Block Area,- August 15, 1980), three sar'kers were installed to monitor:any unanticipated settlement which might occur near eroded areas. These markers have'never shown any unusual settlement and their settlement has stabilized.
None of the markers is used in the calculation of' differential settlements.
One of' the three markers, number 423-la, will continue to be read, but at - month-intervals.. Readings for the - remaining two markers,' 423-1 and 423-1b, will be discontinued but the markers will be retained so that - they will be available Lif readings are requested at some future date.
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U.S. Nuclear Regulatory Commission File:' X7BC35 May 22, 1987 Log:
.GN-1368-Page 3 4
We would appreciate-your. reviewing these modifications to our settlement monitoring program and. notifying us as to your acceptance.
Should your staff require further information, please do not hesitate to contact me.
Sincerely,
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J. A. Bailey Project Licensing Manager JAB /KWK/caa Enclosures (Drawings listed in Appendix A) 1 xc:
J. P. O'Reilly.
R. E. Conway P. D. Rice L. T. Gucwa R. A. Thomas J. E. Joiner, Esquire B. W. Churchill, Esquire M. A. Miller (2)
G. Bockhold, Jr.
NRC Regional Administrator NRC Resident Inspector R. Goddard, Esquire D. Feig R. W. McManus Vogtle Project File f
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TABLE 1 (Page 1 of 3)
List of Markers Whose Reading Frequency Will Be Reduced From Once Every 60 Days to Once every 6 Months Marker No.
Location - Unit 1 100 Turbine Building (Non-Category 1) 101 102 103 104 105 106 163 164 165 Mainsteam Tunnel (Non-Category 1) 166 167 168 159 Radwaste Solidification Building (Non-Category 1) 160 161 119 Control Building 120 121 162 169 170 220 223 420-1 423-1 (Discentinue) 423-1A 423-1B (Discontinue) 4 137 Category 1 Tunnels 171 172 173 174 175 176 177 184 191 196 198
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Table'l (Continued)
-(Page 2 of 3)-
Marker'No.
Location - Unit i 126-
- Fuel Handling Building.
127.
229 133 Auxiliaryj Building.
136 234-124 Containment Unit 1 149 -
Auxiliary Feedwater Pumphouse 150 129-Diesel Generator Building -
130 131 132 145 Diesel Fuel Oil Storage Tank Pumphouse 146 199 1000 143 Category 1 Tanks 144 146 148 138 NSCW Cooling Tower and Valvehouse 152 1001 1002' Marker No.
Location - Unit 2
-202 Turbine Building (Non-Category 1) 203-269 Control Building 420-2 3
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- i Table.1 (Continued)
(Page~3'of-3)-
(Marker No.
Location ~- Unit 2
- 268i Category 1 Tunnels
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230 Fuel l Handling Building 2
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TABLE 2 (Page'1 of 2).
Interfaces to be Read:st Reduced (6-Month) Frequency (Based on Readings Submitted February, 1987)
Actual Min. Differential Marker Diff.
Used in Piping Design Interface Structure Interface.
(In.)
(In.)
163/165 Turbine /Mainsteam 0.04 0.5 164/165 0.03 0.5 104/167 0.12 0.5 168/169
~ Control /Mainsteam 0.05 0.6 170/171 Control / Tunnel 1T4A, 4B 0.06 0.6 150/144 Auxiliary FD Water PMPHS/
0.05 0.5 149/143 Condensate Storage Taak 0.01 0.5 129/172 Diesel Generator Building /
.0.11 0.5
'130/172 Tunnel 1T4A, 4B
- 0. 06 0.5 131/174 Diesel Gen. Bldg./ Tunnel 1T3B 0.11 0.5 132/173 Diesel Gen. Bldg./ Tunnel IT3A 0.05 0.5 130/145 Diesel Generator Building /
0.16 0.5 132/146 Diesel Fuel Oil Storage 0.11 0.5 132/1000 Tank Pamphouse 0.01 0.5 124/121 Containment / Control 0.14 0.6 175/176 Tunnel / Tunnel 0.01 0.3 176/177 Interfaces 0.02 0.3 177/175 1T3A, 1T3B, 1T2A, 1TSA 0.00
-0.3 177/184 0.04 0.3 197/198 0.02 0.3 152/137 NSCW Valve House /
0.07 0.5 137/1001 Tunnel 1T2A, 5A 0.07 0.5 162/127 Control Building / Fuel 0.04 0.6 223/229 Handling Building 0.18 0.6
s Table 2'
~(Page 2 of 2)
Actual
-Min. Differential' Marker Diff.
Used in Piping Design
-Interface Structure Interface (In.)
(In.)
.191/196 Tunnel / Tunnel 1T2B, 5B/1T2B 0.02 0.3.
268/269 Tunnel 2T4A, 4B/ Control (Unit - 2) 0.14 0.6:
423-2/230 Control / Fuel (Unit 2) 0.10 0.6 426/230 containment / Fuel Handling 0.08 0.5
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e TABLE l3 Markers to be Relocated to Improve Access
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Marker No.
' Location -~ Unit 2' 200 Turbine Building (Non-Category 1) 201~
202
.203 204 205 206 263 264 Mainsteam Tunnel (Non-Cateyory 1) 265-267 283 222 Control Building 266 423-2 270 Category 1 Tunnels 228 Fuel Handling Building 230 258 284 Auxiliary Building 247 Auxiliary Feedwater Pumphouse 248 253 Diesel Fuel Oil Storage Tank Pumphouse 254~
295 296 26 0 NSCW Valvehouses 297 299 2000
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f APPENDIX A List of Settlement Drawings Drawing No.
Revision No.
AX2D55V001 13 AX2D55V006 14 AX2D55V007 14 AX2D55V008 14 AX2D55V009 13 AX2D55V010 14 AX2D55V011 14 AX2D55V012 12 AX2D55V013 10 AX2D55V017 6
AX2D55V018 6
AX2D55V019 6
AX2D55V020 5
AX2D55V024 3
AX2D55V025 3
AX2D55V026 3
AX2D55V027 3
AX2D55V028 3
AX2D55V029 2
AX2D55V030 2
AX2D55V050 3
AX2D55V051 3
AX2D55V052 3
AX2D55V053 3
AX2D55V054 3
AX2D55V055 3
AX2D55V056 3
AX2D55V057 3
AX2D55V058 3
AX2D55V059 3
AX2D55V060 3
AX2D55V061 3
AX2D55V062 3
AX2D55V063 3
1164V
l OVERSIZE DOCUMENT PAGE PULLED SEE APERTURE CARDS 1
NUMBER OF OVERSIZE PAGES FILMED ON APERTURE CARDS t
i APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH,TIDC FTS 492-8989 l
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