RC-97-0218, Forwards Response to 970507 RAI Re fifteen-yr Tendon Surveillance Rept.Reactor Bldg post-tensioned Tendon Surveillance Records & Elongation/Tendon Force Comparison Data,Shown in Encl Table

Forwards Response to 970507 RAI Re fifteen-yr Tendon Surveillance Rept.Reactor Bldg post-tensioned Tendon Surveillance Records & Elongation/Tendon Force Comparison Data,Shown in Encl Table

ML20212E644
Person / Time
Site:	Summer
Issue date:	10/28/1997
From:	Gabe Taylor SOUTH CAROLINA ELECTRIC & GAS CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
RC-97-0218, RC-97-218, TAC-M96490, NUDOCS 9711040009
Download: ML20212E644 (11)

Text

_ _ _ . ._ -_ _ _.- _ _ _ _ . .

', soum coronu n.ctric a o . comp.nr gry J.Tevier 2NS.sc2006s H arNath (603) 345-4344 SO E Asetan0ergey October 28,1997 RC 97 0218 Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 ,

Gentlemen:

Subject:

VIRGIL C. SUMMER NUCLEAR STATION (VCSNS)

DOCKET NO. 50/395 OPERATING LICENSE NO. NPF 12 REQUEST FOR ADDITIONAL INFORMATION - FIFTEEN YEAR TENDON SURVEILLANCE REPORT FOR VIRGIL C. SUMMER  ;

NUCLEAR STATION (TAC NO. M96490)

South Carolina Electric and Gas Company (SCE&G) hereby submits the follow!ng i respnnse to your request for additional information dated May 7,1997, regarding the fifteen year tendon surveillance report. This information is provided for you to complete your review.

Should you have any questions, please call Mr. Michael J. Zaccone at (803) 345-4328.

Very Truly yours, f

Gary ay M 90 v

MJZ/GJT I

\

Attachment c: J.L. Skolds NRC Resident Inspector W.F. Conway J.B. Knotts, Jr.

R.R. Mahan (w/o attachment) NSRC R.J. White RTS (TSP 960001)

L.A.Reyes File (813.20)

A.R. Johnson DMS General Managers 9711040009 971029 PDR *  !! hhh ADOCK 05000395 Y PDR NUCLEAR LCELLENCE - A SUMMER TRADITION!

)

, Attachment t3 Document Control Desk RC 97 0218 ,

Page 1 of 10 l l

RESPONSE TO NRC REQUEST FOR ADDITIONAL INFORMATION i l

VIRGIL C. SUMMER NUCLEAR STATION FIFTEEN-YEAR TENDON SURVElLLANCE REPORT REQUFST 1: Provide the force and the corresponding elongation at installation and at retensioning for each of the retensioned tendons for the live ,

surveillances performed to date, and the pertinent comparison. '

RESPONSE TO 1: The Reactor Building Post Tensioned Tendon Surveillance Reco:ds and Elongation / Tendon Force comparison data is shown in the following table. This attached table provides the requested data and the pertinent comparison. The elongation at initial stressing is compared with the elongation at retensioning. With the exception of three tendons from the first surveillance and one tendon from the second curveillance, the remaining 23 of the 27 tendons that have been retensioned (and elongations compared) during the first five 14urveillances are within the 5% correlation acceptance criteria.

The percent difference between elongation at retensioning and the original elongation is calculated as follows:

a. Subtract the total elongation (measured at overstress) for the orlginal stressing from the total elongation (measured at overstress) at retensioning;

b. Divide the result of a. by the total elongation (at overstress) for original stressing.

Multiply the result of b. by 100 to calculate %.

VirgN C.Sunumer Nucker SteWon Fleector BulkSng Post Tensioned Tendon Systeen SurveNIonce Records ..

Elongedon/ Tendon Force Cosuperison Initialinstallation Data Retensioning Data ,

Surveillance Number No.of Years After SIT Tendon 10 Force at Overstress Total Bongation Force et Total  % DIIIerence Betussen g i

Overstrees BongeWon Potenssoning SongeWon m (idps) (inches) (kips) (inches) and Originsi Bongsson N 3

8- 8 1 1 D328 1502 7.05 1502 73125 3.72 g$0 1 1 D220 1527 830 1527 10 20.48 0 1 1 D105 1522 63 1522 7375 8.45 .

1 1 D104 1519 6.9 1519 7.031 1.9 -

1 1 38AC 1602 15.45 1583 16282 -1.09 37AC 1602 g

i 1 1 1430 1583 14375 0 524 3 1 1 36AC 1602 14.50 1602 14.875 2.5  !

1 1 8BA 1602 15.05 1602 15218 1.12 ,

1 1 V69 1602 105 e 1583 9.156 12.8 Er  ;

f~ 1 V46 1499 9.65 1489 9.531 -124 SL O .

2 3 D-220 1527 830 1491 7.8 -6.02 I 2 3 14BA 1602 15.15 1602 e 5.6 2_97 l 2 3 D-228 1514 735 1505 7.435 136 l 2 3 V76 1480 9.50 1471 9.70 2.11 2 3 28BA 1602 15.45 1583 1530 -0.97 3 5 D-316 1516 8.45 1508 8.50 0.6 3 5 V-83 1602 9.70 1540 10.00 3.09  ;

3 5 38 CB 1602

• 15.40 1574 15.0 -2.59 3 5 18 BA 1602 14.90 1592 153 2.68 4 10 D117 1513 8.65 1513 825 -4.62 4 10 14 AC 1602 1440 1583 14.75 2.43 4 10 D332 1487 5.75 1478 6.00 434 4 10 VS1 1602 1030 1593 10.45 1.45 4 10 43 AC 1602 15.90 1593 1530 -3.77 l 5 15 V8 1602 1030 1592 10.50 1.94 5 15 43BA 1S02 15.40 1593 14.95 -2.92 5 15 D226 15.19 i 7.70 1524 7.80 130 i t i

, ' Attachment to Document Control Desk P.C 97 0218 Page 3 of 10 RESPONSE TO NRC REQUEST FOR ADDITIONAL INFORMATION VIRGIL C. SUMMER NUCLEAR STATION FIFTEEN-YEAR TENDON SURVElLLANCE REPORT REQUEST 2: Perform a regression anstlysis for the lift off forces for each of the three groups of tendons. Provide all the lift off force data so that an independent analysis can be performed.

RESPONSE TO 2: Three figures labeled as Figures V 1, D 1. and H 1 provide the regression analyses for the three groups of tendons - vertical, dome, and hoop.

It is noted that the vertica! tendons have been retensioned concurrent with the fourth surveillance. Data for the same three vertical tendons is plotted for both the fourth and the fifth surveillances.

The regression analysis graphs include the individual normalized surveillance tendon liftoff data plotted as individual points versus time.

The three plots demonstrate that the requirement has been met to ensure that the minimum required average tendon force for the vertical, dome, and hoop tendon groups will be available beyond the next scheduled tendon surveillance.

The requested individual surveillance tendon lift off data for each tendon group is provided on the pages following the figures.

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1. ' Attachment to Document Control Desk FIC 97 0218 Page 7 of 10 >

i Table 1 Virgil C. Summer Nuclear Station i Vertical Tendon Surveillance Average Liftoff Force i

Surventance Tendon Surveillance Time ANor Average Normallaing Average

1. ID Date Concrete Measured Factor Normallaed (Average) Placement Liftoff Force (Kips) Liftoff Force (Hours) (Kips) (2) (Kips)

(1) (1) + (2) 1 V23 3/82 49,600 1318 15 1303 1 V92 1282 25 1307 ,

1 V11S 1297 10 1287

-1 V67 1296 21 1275 1 V66 1306 8 1314 1 V68 1003 8 1311 1 V46 1315 11 -1326 2 ,_

V23 11/83 64,200 1286 15 1271 2 V30 1229 31 1260 2 V53 1283 24 1259 2 V76 1267 11 1278 2_ V99 1254 5 1259 3 V22 11/85 81,800 1231 15 1246 3 V23 1242 15 1227 3 V24 1240 3 1243 3 V37 1247 5 1242 3 V59 1231 ~6 1227 3 V60 1219 11 1230 3 V61 1231 -6 1225 3 V83 1258 15 1243 3 V106 1231 7 1238 4 V1 3/90 119,600 1170 1 1171 4 V2 1161 23 1184 4- V3 1187 10 1177 4 V4 1188 12 1200 ,

4 V5 1193 -13 1180 4 V7 1197 14 1183 4 VS1 1199 9 1190 4 V63 1216 9 1207 4 V90 1187 12 1199 4 V94 1218 12 1206 5 V8 $/96 172,100 1306 17 1289 5 V40 *307

. 7 1314 5 V90 1316 10 1326

-. . .. _- . __ __ - - . _- - - - = _. . _-.

' Attachnient t) Document Control Desk RC 97 0218 Page 8 of 10 Table 2 Virgil C. Summer Nuclear Station Dome Tendon Surveillance Average Liftoff Force Survelliance Tendon SurveNiance Time Amer Avere0e Normalizing Average

1. ID ' Date Concrete Measured Factor Normallaed (Average) Placement Liftoff Force (Kips) LINoff Force (Hours) (Kips) -(2) (Kips)

(1) (1) + (2) i 1 D219 4/82 34,600 1207 10 1217 l 1 D220 1217 42 1217 1 D218 1223 26 1223 1 D103 1215 38 1253 1 D327 1229 35 1264 1 D127 1206 33 1239-1 D128 1264 43 1221 ,

1 D130 1235 9 1244 1 D104 ,

1228 24 1204 1 DIOS 1251 28 1279 2 D125 11/83 48,800 1174 9 1210 2 D213 1199 46 1245 ,

2 D219 1168 10 1178 2 D228 1217 -28 1189

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4 D211 1145 32 1177 4 D226 1145 0 1145 4 D303 1147 8 1155 4 D332 1185 16 1169 5 D112 5/96 156,700 1146 36 1110

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• Attachment 13 Document Control Desk RC 97 0218 i P40s 9 of 10 l i

Table 3. i Virgil C. Summer Nuclear Station i Hoop Tendon Surveillance J Average Liftoff Force ,

Normalising Survenience Tendon Surveillance Time After Average Average

=# 10 Date conorote Measumd Factor Normalised (Average) Plecement Liftoff Force (Kips) Liftoff ,

(Hours) (Kips) (2) Force >

(1) (Kips) .

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-1 36AC 1212 0 1212 1 35AC 1250 40 1210 1 39AC 1240 33 1207 1 40AC 1231 3 1228 ,

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o. . Attachment to Document Control Desk RC 97 0218 Page 10 of 10 Table 3 Virgil C Sum:ner Nuclear Station Hoop Tendon Surveillance Average Liftoff Force Surveillance Tendon Sunelitance l Time After Average Normalizing Average

1. ID Date Concrete Measured Factor Normalized -

(Averego) Plecoment Liftoff Force (Kips) Lifloff (flours) (Kips) (2) Force (1) (Kips)

(1) + (2) 3 2AC 11/85 81,800 1264 12 1276 3 3AC 1234 56 1178 3 4AC 1205 33 1238 3 27AC 1209 50 1159 3 28AC 1167 10 1177 3 29AC 1195 10 1205 3 17BA 1155 5 1150 ~

3 18BA 1097 34 1131 3 19BA 1166 34 1132 3 32BA 1154 15 1169 3 33BA 1171 16 1155 3 34BA 1174 23 1197 3 7CB 1201 45 1156 3 800 1140 26 1166 3 900 1184 34 1150 '

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1141 44 1097 4 15BA '

1140 -53 1087 4 16BA ~

1081 7 1068 4 32AC 1102 15 1117 4 33AC 1121 10 1111 34AC 1053 50 1103 4 34CB 1099 58 1157 4 43AC 1167 34 1133 4 46AC 1141 41 1100 5 13AC 5/96 173,600 1214 -44 NA (PREVIOUSLY RESTORED) 5 43BA 1128 25 1103 5 30C0 1080 28 1108 1

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