ML20235A559

Pcrv Tendon Interim Surveillance Rept. W/Four Oversize Drawings

ML20235A559
Person / Time
Site:	Fort Saint Vrain
Issue date:	01/31/1988
From:	PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20235A554	List: ML20235A552 ML20235A559 ML20265C760 ML20265C764 ML20265C769 ML20265C773
References
NUDOCS 8801120322
Download: ML20235A559 (28)

Text

, _ _ _ _ _ _ _ _ _ _ - _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

PCRV TENDON INTERIM SURVEILLANCE ,

REPORT  !

r JANUARY 1988 Fort St. Vrain Nuclear Generating Station  :

Public Service Company of Colorado I

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8801120322 880108 PDR ADOCK 05000267 R PDR I

/^\

ABSTRACT This report is the fifth consecutive semiannual report to be submitted under the current requirements of the interim surveillance program established to monitor corrosion in the Prestressed Concrete Reactor Vessel (PCRV) prestressing tendons.

Surveillance findings are reported for the following interim surveillance program groups of tendons: (1) control tendons for visual inspection and liftoff testing, and (2) "new" tendons for visual inspection and liftoff testing.

'Also, the findings of the third semiannual visual surveillance on the worst-case tendon group, including Tendon CM 4.6, are reported.

The major findings, facts and conclusions reported herein are summarized below:

• No new noneffective wires have been observed in any of the control tendons since the start of the interim surveillance program in June 1985.  !

• Based on the control tendon surveillance results to date, the (q/

rate of corrosion in the tendon system continues to be extremely low or nonexistent and of no immediate concern.

The tendon liftoff loads measured to date for the control  !

tendons, in all cases, continue to be well above the minimum design loads for each tendon type; moreover, the measured liftoff loads do not exhibit any trend towards significant load relaxation or load loss.

• Based upon the lack of any increase in the number of noneffective wires, there is no indication that corrosion is continuing in any of the 31 previously-surveilled "new" tendons.  ;

• The liftoff loads measured to date for each of the 29 "new" tendons for liftoff testing are well above the minimum design load for each tendon. Of the 12 "new" tendons for liftoff testing with a previous liftoff test, none have shown any signs of significant load loss.

• Based upon a lack of increase in noneffective wires in the worst-case tendons, it is evident that the corrosion rate remains at a very low level in these tendons.

• No increase in noneffective wires was observed in Tendon CM 4.6.

Approximately one-third quart of water was drained from Tendon CM 4.6, which is a ten-fold reduction compared to the previous six-month amount.

1 I

l To date, 359 of the total 448 PCRV tendons, or 80.1 percent, have

-.had a visual inspection on at least one end at least one time  ;

since March 1, 1984.  ;

Of the 359 tendons surveilled since March 1, 1984, a total of 61, or 17.0 percent, have been observed with noneffective wires.

These 61 tendons include 56 tendons with only 7 or.' fewer noneffective wires each and only 5 tendons with 16 or more noneffective wires each.

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Tendon surveillance results continue to demonstrate that,-left-in their present condition, every PCRV tendon .w ill likely sustain load above the minimum required lo'd a for many years to come.

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. _ _ - _ _ _ _ _ - _ _ _ _ _ - _ - _ _ _ ___m

LO CONTENTS

1.0 INTRODUCTION

. . . . .. ................... 1 1

2.0 PCRV TENDON SURVEILLANCE INFORMATION. . . . . . . . ..... 1 2.1' FINDINGS OF THE FIFTH SIX-MONTH INTERIM SURVEILLANCE PROGRAM PERIOD. . . . . . . . . . . l' 2.1.1 Visual Inspection . . .............. 2 2.1.1.1 Control Tendons. . . . . . . . . . . . . 2 2.1.1.2 New Tendons. . . . . . . . . . . . . . . .-2 2.1.2 Lifto'ff Testing . . . . . . . . . . . . . . . 12 2.1.2.1 Control. Tendons. . . . . . . . . . . . . 12 2.1.2.2- New Tendons. . . . . . , . . . . . . . . 12

~

2.2 WORST-CASE TENDON SURVEILLANCE. . . . . . . . . . . . . 14

^2.2.1 Tendon CM 4.6 . . . . . . . . . . . . . . 14 2.3 SUPPLEMENTAL TENDON SURVEILLANCE . . . . . . . . . . . 17 2.4 COLLECTIVE TENDON SURVEILLANCE INFORMATION SUMMARIES. . . . . . . . . . . . . . . . . . 17 2.4.1' Tendons with Noneffective Wires . . . . . . . . . 17 2.4.2 Tendon Surveillance Historical Information. . . . 20 2.4.3 Number and Percentage of Tendons Surveilled to Date. . . . ........,...20 APPENDIX A: PCRV TENDON SURVEILLANCE PLAN DRAWINGS . . . . . . . . 23 OL

Page 1 of 23 t

1.0 INTRODUCTION

This- report is being . submitted to comply with the requirements of the interim surveillance program which' has been set up to monitor corrosion in the Prestressed Concrete Reactor Vessel (PCRV) prestressing tendons (

Reference:

P-85071, dated March 5, 1985). This is the fifth consecutive semiannual report.to be submitted under this program; the first, second, third and fourth six-month reports were submitted under Letters P-86042 (January 22, 1986), P-86463 (July 18, 1986), P-87021 (January 18, 1987) and P-87234' (July 20,1987), respectively. As explained in the January 1986 report, the effective start date for the interim surveillance. program was established as July 21, 1985, with the findings of the tendon surveillance performed during each six-month interval to be reported at the end 'of each period.

Pending NRC concurrence, future tendon surveillance will be performed and reported on an annual schedule as proposed in-Letter P-87234, dated July 20, 1987.

The present submittal reports the findings. of tendon surveillance performed since the July 1987 report; more specifically, the. actual tendon surveillance included in p this report were performed between July 1 and November 30, 1987.

In addition to the control and new tendon groups as part of the interim surveillance program, this report also covers the findings of the third and final semiannual visual surveillance performed on the five(5) worst-case tendons as established in the Attachment (pp. 10 and 11) to Letter P-86491, dated July 29, 1986. Future surveillance on the worst-case tendons will also be performed and reported annually as proposed in Letter P-87234.

2.0 PCRV TENDON SURVEILLANCE INFORMATION 2.1 FINDINGS OF THE FIFTH SIX-MONTH INTERIM SURVEILLANCE PROGRAM PERIOD -

The PCRV tendon interim surveillance program scope and requirements were discussed in detail in Section 2.1 of the

-January 1986 report (P-86042). The findings of the surveillance performed during the fifth six-month interim surveillance period are reported here.

For ease of I comparison and cohesiveness from report to report, the i tabular, graphical, text and organiz'ational format of  !

findings continue to appear in the same manner in this report as in the eariier reports. I O

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Page 2 of 23 j

l . 2.1.1- Visual Inspection 2.1.1.1 Control Tendons The control tendon group for visual inspection is that group of tendons which, once selected, remains the same for each semiannual visual inspection period. The tendons chosen as-control tendons for visual inspection, selected during the first six-month interim surveillance period and initially presented in the January 1986 report, are as follows:

Top Bottom-Circumferential Crosshead Crosshead Longitudinal CM 1.1 TIRM2 BIRM4 VM-10 VM-37 CO 14.4 BILM3 VI-20 VI-40 CM 16.3 VM-20 VM-40 A historical surveillance information summary for each end of each control tendon, including the findings during this latest six-month interim surveillance period, is presented in Table 2.1-1.

The general observation and discussion of findings relative to the control tendons provided in Section 2.2.1.1 of the p January 1986 report (P-86042) remains applicable here.

Based on the line of reasoning from this discussion and referring to the findings reported in Table 2.1-1, it is noted that no new noneffective wires have been observed in any of the control tendons during this latest (fifth) semiannual surveillance period as compared with previous surveillance. In fact, no new noneffective wires have been observed in any of the twelve (12) control tendons for the 21s year period since the start of the interim surveillance program in June 1985.

Based on the control tendon surveillance results to date, the rate of corrosion in the tendon system continues to ba extremely low or nonexistent and of no immediate concern.

2.1.1.2 New Tendons l The new tendons selected for visual inspection for this fif th six-month interim surveillance period are as follows:

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Page 3 of 23 TABLE 2.1-1 CONTROL TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of (Number of Tendon Surveillance Sury. Noneffective Liftoff Orig. Wires) End(1) Date Type (2) Wires (3) Load (kips)(4)

CM 1.1 1 11/03/87 L 0 1325 (169) I 05/22/87 L 0 1347 I 11/04/86 L 0 1350 1 06/12/86 L 0 1371 I 10/15/85 L 0 1392 I 10/02/84 L 0 .1315 III 10/27/87 L 0 1318 III 05/26/87 L 0 1318 III 10/29/86 L 0 1318 III 06/11/86 L 0 1314 III 10/17/85 L 0 1327 III 10/02/84 L 0 1275 q CO 14.4 II 09/17/87 L 0 1246 V (152) II II 04/01/87 10/29/86 L

L 0

0 1224 1218 II 06/07/86 L 0 1275 II 12/20/85 L 0 1237 II 10/17/84 L 0 1180 i VI 09/19/87 L 0 1160 VI 04/10/87 L 0 1175 VI 10/24/86 L 0 1167 VI 06/09/86 L 0 1208 VI 12/19/85 L 0 1196 VI 10/17/84 L 0 1150 CM 16.3 III 09/15/87 L 0 1374 (169) III 05/01/87 L 0 1379 III 09/29/86 L 0 1310 III 06/07/86 L 0 1387 III 12/13/85 L 0 1380 III 03/25/85 L 0 1352 I

V 09/15/87 L 0 1349 V 04/29/87 L 0 1360 V 10/16/86 L 0 1299 l V 06/11/86 L 0 1372 V 12/16/85 L 0 1373 V 03/26/85 L 0 1368 L

(continued next page)

Page 4 of 23

( TABLE 2.1-1 (cont.)

CONTROL TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of (Number of Tendon Surveillance Sury. Noneffective Liftoff Oric. Wires) End(1) Date Type (2) Wires (3) Load (kips)(4)

TIRM2 III-IV 11/06/87 L 0 1325 (169) III-IV 05/13/87 L 0 1376 III-IV 10/24/86 L 0 1359 III-IV 05/21/86 L 0 1392 III-IV 12/18/85 L 0 1377 III-IV 02/05/85 L 0 1364 VI-I 11/05/87 L 0 1353 VI-I 05/19/87 L 0 1368 VI-I 10/21/86 L 0 1281 VI-I 05/20/86 L 0 1391 i VI-I 12/17/85 L 0 1380 VI-I 02/13/85 L 0 1370 BIRM4 III-IV 11/02/87 L 0 1357

(,,g)

.f- (169) III-IV 03/09/87 L 0 1338 III-IV 10/31/86 L 0 1363 III-IV 04/18/86 L 0 1395 III-IV 12/30/85 L 0 1372 III-IV 03/85 V 0 N/A III-IV 09/11/84 L N/R 1291 III-IV 04/01/84 V N/R N/A (Load Cell) VI-I 11/02/87 L 0 1333 VI-I 03/16/87 L 0 1289 VI-I 11/05/86 L 0 1306 VI-I 04/29/86 L 0 1364 VI-I 11/27/85 L 0 1344 VI-I 03/85 V 0 N/A VI-I 09/11/84 L N/R 1307 VI-I 04/01/84 V N/R N/A VI-I 12/71 V N/R N/A BILM3 III-IV 11/03/87 V 0 N/A (169) III-IV 03/09/87 V 0 N/A III-IV 10/31/86 V 0 N/A III-IV 04/18/86 L 0 1388 III-IV 01/03/86 L 0 1352 III-IV 03/85 V 0 N/A III-IV 09/12/84 L 0 1287

(

\_

III-IV 04/01/84 V N/R N/A (continued next page)

Page 5 of 23 I

g TABLE 2.1-1 (cont.J CONTROL TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of (Number of Tendon Surveillance Sury. Noneffective Li f tof f Orig. Wires) End(1) Date Type (2) Wires (3) Load (kips)(4J l

BILM3 (cont.) VI-I 11/04/87 V 1 N/A (169) VI-I 03/16/87 V 1 N/A VI-I 11/07/86 V 1 N/A VI-I 04/30/86 L 1 1319 VI-I 12/03/85 L 1 1298 VI-I 03/85 V 1 N/A VI-I 09/12/84 L 1 1279 VI-I 04/01/84 V N/R N/A VM-10 Top 07/16/87 L 7 1370 (169) Top 02/05/87 L 7 1375 Top 09/25/86 L 7 1305 .

Top 05/24/86 L 7 1413 1 Top 06/20/85 L 7 1388 e3 Top 01/17/85 V 7 N/A

() Top Top 04/19/84 03/28/84 L

V 3

3 1344 N/A VI-20 Top 07/17/87 L 0 1396 (169) Top 02/03/87 L 0 1432 Top 09/25/86 L 0 1391 Top 05/24/86 L 0 1459 Top 06/21/85 L 0 1437 Top 01/30/85 V 0 N/A Top 04/17/84 L 0 1443 Top 03/27/84 V N/R N/A VM-20 Top 07/17/87 V 0 N/A (169) Top 02/03/87 V 0 N/A Top 09/24/86 V 0 N/A Top 05/24/86 V 0 N/A i Top 06/21/85 V 0 N/A I Top 01/30/85 V 0 N/A ,

Top 04/17/84 L 0 1449  !

Top 03/27/84 V N/R N/A (continued next page)  !

Page 6 of 23

,~.,

(); TABLE 2.1-1 (cont.)

CONTROL TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of (Number of Tendon Surveillance Surv. Noneffective Li f tof f Orig. Wires) End(1) Date Type (2) Wires (3) I. cad ( kips)(4)

VM-37 Top 07/23/87 V 1 N/A (169) Top 02/09/87 V 1 N/A Top 09/24/86 V 1 N/A Top .06/16/86 V 1 N/A Top 06/19/85 V 1 N/A Top 01/19/85 V 1 N/A Top. 04/09/84 L 1 1444 Top 03/28/84 V 1 N/A VI-40 Top 07/24/87' V 0 N/A (169) Top 02/09/87 V 0 N/A

. Top 09/24/86 V 0 N/A Top 06/04/86 V 0 N/A Top 06/18/85 V 0 N/A f

\

Top Top 01/30/85 04/19/84 V

L 0

0 N/A 1438 Top 03/28/84 V N/R N/A VM-40 Top 07/24/87 L 0 1416 (169) Top 02/09/87 L 0 1416 Top 09/25/86 L 0 1355 Top 06/04/86 L 0 1454 Top 06/18/85 L 0 1437 Top 01/30/85 V 0 N/A Top 04/19/84 L 0 1433 Top 03/28/84 V N/R N/A NOTES (by reference number):

1) Indicated by PCRV buttress number. If between two' buttresses, indicated by both nearest buttress numbers. Longitudinal tendons indicated by " Top" or " Bottom".

2) L: Liftoff and visual inspection of anchor assembly and wire bundle.

V: Visual inspection of anchor assembly Way.

3) N/R: Not reported O 4) N/A: Not applicable for a visual-only surveillance; i.e., no liftoff test performed.

s Page 7 of 23.

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Top Bottom Circumferential Crosshead Crosshead Longitudinal CI 12.5 TILMI. BIRU3 VI-1 V0-28 CM 12.5 BORU3 'VM VI-29 CI 14.5 BIRL3 VI-2 VM-29 i CM 14.5 BORL3 VM-2 VI-32 '

C0 14.5 BORM3 VI-11 VI-33 CM 17.5 BOLM4 VM-11 VI-34 CM 8.6 VI-17' V0-35 CO 8.6 VM VI-36 CI 11.6 VM-22 VM-36 CM 11.6 VI VI-38 CI 13.6' VI-28 VM-38 CM 13.6 VM-28 VI-39 C0 13.6 A summary of the latest surveillance information gathered during this fifth six-month interim. visual-surveillance period for each end of each new tendon is presented inLTable 2.1-2. Those tendon ends surveilled: for the first time  !

since original installation in the year 1970 are noted in the table.

The number .of new tendons for visual inspection of each L e-- tendon type observed with noneffective wires are as follows:

three(3) out of thirteen (13) new circumferential,'zero(0) out of one(1) new top crosshead, two(2) out' of six(6) new bottom crosshead and four(4) out. of twenty-four(24) new

-longitudinal. The actual number of noneffective wires observed in each of these tendons is given.in Table 2.1-2.

Out of the total of forty-four(44) new tendons for visual inspection, thirty-one(31) have had at least one previous surveillance on both ends since March 1984 (the date of discovery of the tendon corrosion problems). Out of these 31 previously-surveilled new tendons, none have shown any increase in the number of noneffective wires. Based upon this lack of increase in the number of noneffective wires, there is no indication that corrosion is continuing in any  ;

of these tendons.  !

Of the thirteen (13) remaining new tendons for visual inspection with no previous surveillance record on either end,' all of which are circumferential tendons, three(3) were observed with noneffective wire (s): Tendons CI 14.5 and CM 13.6, each with one(1) noneffective wire on one end only, and Tendon CM 17.5 with three(3) noneffective wires, two(2) of which became noneffective (i.e., failed) during liftoff.

These noneffective wire numbers are not out of line with numbers of noneffective wires found previously in other circumferential tendons.

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Page 8 of 23

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TABLE 2.1-2 NEW TENDONS LATEST SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of (Number of Tendon Surveillance Sury. Noneffective Liftoff Orig. Wires) End(1) Date , Type (?.,} Wires Load (kips)(3)

CI 11.3 III 05/01/87(4) L 0 1236 (152) V 04/23/87(4) L 0 1199 CM 12.3 III 05/01/87(4) L 0 1207 (152) V 04/27/87(4) L 0 1195 CO 14.3 III 05/06/87(4) L 0 1212 (152) V 04/23/87(4) L 0 1216 CI 15.4 II 04/06/87(4) L 0 1212 l (152) VI 04/14/87(4) L 0 1236 l CO 15.4 II 04/02/87(4) L 1 1255 l (152) VI 04/14/87(4) L 1 1224 9 CM 16.4 (169)

II VI 04/09/87(4) 04/15/87(4)

L L

1 0

1350 1383 CI 12.5 I 07/09/87(4) L 0 1199 (152) V 07/06/87(4) L 0 1203 CM 12.5 I 07/09/87(4) L 0 1199 (152) V 07/06/87(4) L 0 1195 CI 14.5 I 07/07/87(4) L 1 1231 (152) V 07/13/87(4) V 0 N/A CM 14.5 I 07/07/87(4) L 0 1226 (152) V 07/13/87(4) V 0 N/A CO 14.5 I 07/07/87(4) L 0 1154 (152) V 07/13/87(4) L 0 1201 CM 17.5 I 10/06/87(4) L 3 1374 (169) V 10/02/87(4) L 0 1329 CM 8.6 II 10/26/87(4) L 0 1209 (152) IV 10/23/87(4) L 0 1164 CO 8.6 II 10/26/87(4) L 0 1175 (152) IV 10/23/87(4) L 0 1205 (continued next page)

l Page 9 of 23 TABLE 2.1-2 (cont.)

i NEW TENDONS LATEST SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of (Number of Tendon Surveillance Surv. Noneffective Liftoff Orig. Wires) End(1) Date Type (2) Wires Load (kips)(3)

CI 11.6 II 09/10/87(4) L 0 1201 (152) IV 07/28/87(4) L 0 1187 CM 11.6 II 09/10/87(4) L 0 1191 (152) IV 07/28/87(4) L 0 1187 CI 13.6 II 09/11/87(4) L 0 1207 (152) IV 07/30/87(4) L 0 1236 CM 13.6 II 09/11/87(4) L 1 1118 (152) IV 07/30/87(4) L 0 1142 CO 13.6 II 09/11/87(4) L 0 1154 (152) IV 07/30/87(4) L 0 1179 TIRL2 I-II 05/21/87 L 0 1387

(]

U (169) IV-V 05/15/87 L 1 1318 TILM1 III-IV 11/06/87 V 0 N/A (169) VI-I 11/05/87 V 0 N/A BIRU3 I-II 11/06/87 V 1 N/A l (169) IV-V 11/06/87 V 0 N/A BORU3 I-II 11/06/87 V 0 N/A (169) IV-V 11/06/87 V 0 N/A BOLU4 I-II 02/25/87 L 0 1365 (169) IV-V 03/03/87 L 0 1327 BIRU4 I-II 02/25/87 L 0 1330 (169) IV-V 03/03/87 L 0 1333 BIRL3 II-III 10/27/87 V 0 N/A (169) V-VI 10/29/87 V 0 N/A BORL3 II-III 10/28/87 L 0 1353 (169) V-VI 10/29/87 L 0 1335 BORM3 III-IV 11/02/87 V 0 N/A (169) VI-I 11/04/87 V 0 N/A v

(continued next page)

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Page 10 of 23 l

(J TABLE 2.1-2 (cont.)

NEW TENDONS LATEST SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of (Number of Tendon Surveillance Sury. Noneffective Liftoff Orig. Wires) End(1) Date Type (2) Wires Load (kips)(3)

BOLM4 III-IV 11/03/87 V 3 N/A (169) VI-I 11/04/87 V 0 N/A VI-1(169) Top 07/15/87 V 0 N/A VM-1(169) Top 07/15/87 V 0 N/A VI-2(169) Top 07/16/87 V 5 N/A VM-2(169) Top 07/16/87 V 0 N/A VM-3(169) Top 02/06/87 L 0 1452 i

VI-6(169) Top 01/30/87 L 0 1465 VI-11(169) Top 07/16/97 V 0 N/A VM-11(169) Top 07/16/87 V 1 N/A VM-13(169) Top 02/04/87 L 0 1424 VI-17(169) Top 07/17/87 V 0 N/A VM-17(169) Top 07/17/87 V 6 N/A VM-22(169) Top 07/20/87 L 0 1414 VI-24(169) Top 02/03/87 L 0 1433 VI-26(169) Top 07/21/87 L 0 1447 VI-27(169) Top 02/04/87 L 0 1428 VI-28(169) Top 07/20/87 V 0 N/A VM-28(169) Top 07/20/87 L 0 1398  !

V0-28(169) Top 07/20/87 L 0 1400 VI-29(169) Top 07/21/87 L 0 1444 VM-29(169) Top 07/21/87 L 1 1414

{

(continued next page) {

i

Page 11 of'23 r

TABLE 2.1-2 (cont.)-

NEW TENDONS LATEST SURVEILLANCE INFORMATION

SUMMARY

. Tendon No. Number of

-(Number of Tendon Surveillance Sury. Noneffective Liftoff Orig. Wires) End(1) Date Tvoe(2) Wi re s -.- Load (kips)(3)

VI-32(169) Top 07/22/87 L 0 143'O VI-33(169)' Top 07/22/87 V 0 N/A VI-34(169)- Top 07/22/87 LV 0 N/A V0-35(169) Top 07/22/87- V 0 N/A-VI-36(169) Top 07/22/87 L 0 1447 VM-36(169) Top 07/22/87 L Oi 1435 VI-38(169). Top 07/23/87 L 0 -' '1443 VM-38(169) Tcp G7/23/87 L 0 1447 VI-39(169) ' Top 07/24/87 L. 0 1416 VM-39(169) Top 02/09/87 L 0 1420 NOTES (by reference number):

1) Indicated' by PCRV buttress number. If between two buttresses, indicated by both nearest buttress numbers. Longitudinal tendons indicated by " Top" or " Bottom".

2) L: Liftoff and visual inspection of anchor assembly and wire bundle.

V: Visual inspection of anchor assembly only.

'3) N/A: Not applicable for a visual-only surveillance; i.e., no liftoff test performed.

4) First surveillance since original installation in 1970. I O

{

Page 12 of 23-f3

(") The new-tendon observations during the fifth six-month interim surveillance program period continue to demonstrate that PCRV tendon corrosion is random in nature among the tendons of each tendon type. The observations of the latest new-tendon group also continue to show that the circumferential tendons have been subjected to some corrosion, but not to the general extent or degree of severity observed previously for the bottom crosshead and longitudinal tendons.

2.1.2 Liftoff Testing 2.1.2.1 Control Tendons The control tendon group for liftoff testing is that group of tendons which, once selected, remains constant in identity and quantity during each six-month period of the interim surveillance program. The tendons chosen as control tendons for liftoff testing, included in the centrol group for visual inspection, were selected during the first six-month interim surveillance period and initially presented in the January 1986 report. These liftoff control tendons are as follows:

Top Bottom

/] Circumferential Crosshead Crosshead Longitudinal L._)

CM 1.1 TIRM2 BIRM4 VM-10 CO 14.4 (load cell) VI-20 CM 16.3 VM-40 The most recent and historical measured liftoff loads for each of these liftoff control tendons is presented in Table 2.1-1. The load cell reading during the most recent liftoff on Tendon BIRM4 was 1291 kips, which compares favorably with four previous readings of 1250,1253,1264 and 1257 kips.

The tendon liftoff loads measured to date for the control tendons, in all cases, continue to be well above the minimum design loads for each tendon type as reported earlier in Letter P-84135, dated May 7, 1984. Moreover, the measured liftoff loads do not exhibit any trend towards significant load relaxation or load loss. The differences in measured liftoff load values noted for each control tendon from one liftoff to the next are consid? red primarily due to measurement system inaccuracies.

2.1.2.2 New Tendons As part of the PCRV tendon interim surveillance program requirements, a new tendon group is to be randomly selected O and liftoff tested during each eighteen (18)-month program 1 (d period. The new tendons selected for liftoff testing may be included in any of the new tendon groups selected for six-j

! month visual inspections during the 18-month period.

L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Page 13 of 23 Lif tof f surveillance findings on the.new tendons selected  !

for liftoff testing for the first 18-month period, covering July. 21, 1985, to Jan'uary 21, 1987, were reported ahead of

.the committed schedule in the tendon surveillance report -

submitted under Letter P-86463, dated July 18, 1986. '

Under the current > " gram, the new tendons for liftoff testing for the second 18-month interim surveillance period, covering January 21, 1987, to July 21, 1988, are presented with surveillance findings in this report, six months ahead of the final July 1988 commitment date.

The new tendons randomly selected for liftoff testing for the second 18-month interim surveillance period are as follows:

Top Bottom

_Ci rcumferential Crosshead Crosshead Longitudinal CI 11.3 CI 12.5 TIRL2 BORL3 VM-3 VI-27 .;

CM 12.3 CO 14.5 BOLU4 VI-6 VM-28 '

CO 14.3 CM 17.5 BIRU4 VM-13 VI-32 CI 15.4 CM 8.6 VM-22 VM-36 CO 15.4 CI 11.6 VI-24 VI-38 CM 16.4 CM 13.6 VI-26 .VM-39 O

%./

CO 13.6 The. most recent measured liftoff load for each of these liftoff new tendons is presented in Table 2.1-2. .!

The total number of new tendons for liftoff testing of each tendon type observed with noneffective wires are as follows:

four(4) out of thirteen (13) new circumferential, one(1) out of one(1) new top crosshead, zero(0) out of three(3) new bottom crosshead and zero(0) out of twelve (12)- new longitudinal. The actual number of noneffective wires observed in each of these tendons is given in Table 2.1-2.

Out of the total of twenty-nine(29) new tendons for liftoff testing, sixteen (16) have had at least one previous visual inspection and, of these 16, twelve (12) tendons have had a previous liftoff test. Based on noneffective wires, there is ' no indication that corrosion is continuing in these 16 previously-surveilled new tendons; i.e., there has been no increase in the number of noneffective wires in these 16 new tendons since the original surveillance of each.

Additionally, of the 12 new tendons for lif toff testing with a previous liftoff test, none have shown any signs of significant load loss due to wire relaxation or tendon f- degradation. Moreover, the liftoff loads measured to date 8 for each of the liftoff new tendons are well above the minimum design load for each tendon.

l.

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Page 14 of 23 l 2.2' WORST-CASE' TENDON SURVEILLANCE i

As indicated in Section 1.0, this report also covers the l findings of the third semiannual visual inspections l performed on the tendons from the worst-case tendon group, {

This group consists of the following five(5) tendons:

1 Worst-Case Tendons .

9 CO 2.5 CM 4.6 BILU3 BILU4 VM-3n A historical surveillance information summary including the findings during this latest (third) semiannual period for each end of each worst-case tendon is presented in Table

^2.2-1.

The number of noneffective wires has not increased in any of the worst-case tendons compared to the numbers reported in the last two (January and July,1987) surveillance' reports for 'the first and second semiannual worst-case tendon

. surveillance periods. Furthermore, there has been no i increase in noneffective wires in the worst-case tendons for

\ a period of at least 215 years (except for Tendon CM 4.6, first surveilled in March 1986) which continues to demonstrate. that the corrosion Vate is at a.very low or nonexistent level in .these tendons. This remains a favorable sign with respect to all other PCRV tendons which currently exist in a substantially lesser-corroded state.  !

2.2.1 Tendon CM 4.6 A full chronological summary of events relative to Tendon CM 4.6 was presented in the last surveillance report (July 1987, P-87234). As indicated in that repurt, a' fluorescent dye was investigated for its use in the System 46 PCRV liner cooling water system as a means of determining whether System 46 water is the source of water buildup in Tendon CM 4.6. As a result, a red fluorescent dye was added to the' .

System 46 water on September 3, 1987. 1 i

A visual surveillance of Tendon CM 4.6 was performed on November 24, 1987. As shown in Table 2.2-1, no increase in noneffective wires was observed. Approximately one-third quart of water was drained from the tendon. This six-r ' nth accumulation is a favorable ten-fold reduction from che i previous six-month accumulation of approximately 3.4 quarts ,

as reported in the last (July 1987) surveillance report, l O '

Page 15 of 23 A

V TABLE 2.2-1 WORST-CASE TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of (Number of Tendon Surveillance Sury. Noneffective Liftoff Orig. Wires) End(1) Date Type (2) Wires (3) Load (kips)(4) ]

CO 2.5 1 09/30/87 V 16 N/A (169) I 05/26/87 V 16 N/A I 11/14/86 V 16 N/A I 07/22/86 V 16 N/A I 06/14/84 L 3 1295 V 09/30/87 V 2 N/A V 05/26/87 V 2 N/A V 11/14/86 V 2 N/A V 07/22/86 V 2 N/A V 06/14/84 L 0 1327 CM ?.6 II 11/24/87 V 20 N/A l (169) II 05/27/87 V 20 N/A  !

II 11/14/86 V 20 N/A p) s_

II II 06/20/86 04/08/86 V

L 20 20 N/A 1235 IV 11/24/87 V 0 N/A ,

IV 05/27/87 V 0 N/A IV 11/15/86 V 0 N/A ,

IV 06/20/86 V 0 N/A I IV 04/08/86 V 0 N/A BILU3 I-II 11/06/87 V 18 N/A (169) I-II 02/20/87 V 18 N/A I-II 11/14/86 V 18 N/A I-II 05/15/86 L 13 1016 I-II 03/16/85 V 16 N/A I-II 08/14/84 L 15 975  !

IV-V 11/06/87 V 20 N/A IV-V 03/02/87 V 20 N/A l IV-V 11/14/86 V 20 N/A IV-V 05/16/86 L 20 1249 IV-V 03/16/85 V 20 N/A IV-V 08/14/84 L 12 1223 4 IV-V 04/13/84 L 8 1228

)

(continued next page)

Page 16 of 23 h- TABLE 2.2-1 (cont.)

~

WORST-CASE TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of (Number of Tendon Surveillance Surv. Noneffective Liftoff Orig. Wires) End(1) Date Type (2) Wires (3) Load (kips)(4) l BILU4 I-II 11/06/87 V 28 N/A I (169) I-II 02/20/87 V 28 N/A I-II 08/11/86 L 28 1056 I-II 07/22/86 V 28 N/A I-II 03/15/85 V 28 N/A i I-II 05/15/84 L 17 1150 '

I-II 04/01/84 V 17 N/A IV-V 11/06/87 V 3 N/A IV-V 03/02/87 V 3 N/A IV-V 07/22/86 V 3 N/A IV-V 03/15/85 V 3 N/A IV-V 05/15/84 L N/R 1140 '

IV-V 04/01/84 V N/R N/A 9 VM-30 (169)

Top Top Top 07/22/87 02/11/87 09/25/86 V

V V

22 22 22 N/A N/A N/A Top 06/16/86 L 22 1312 Top 01/17/85 V 22 N/A Top 04/09/84 L 21 1296 Top 03/29/84 V 21 N/A I

NOTES:

1) Indicated by PCRV buttress number. If between two buttresses, indicated by both nearest buttress numbers. Longitudinal tendons indicated by " Top" or " Bottom"

2) L: Liftoff and visual inspection of anchor assembly and wire bundle.

V: Visual inspection of anchor assembly only.

,. 3) N/R: Not reported

4) N/A: Not applicable for a visual-only surveillance; i.e., no liftoff test performed.

Page 17 of 23

.( ,.,) An analysis of the latest water sample from the tendon shows no trace of the fluorescent dye added to System 46. This is not considered at this time, however, as conclusive evidence that the water is not originating from System 46. Any buildup of water with dye in the tendon since the addition of the dye to System,46 may have been sufficiently diluted by a previous non-dye water buildup so as not to be detectable. Another water sample will be collected and analyzed for traces of dye after another six to twelve months of water accumulation (if any) in the tendon.

As evidenced by a liftoff test in April 1986, Tendon CM 4.6 is carrying effective PCRV prestress load and remains an effective member of the tendon system.

2.3 SUPPLEMENTAL TENDON SURVEILLANCE Due to extensive maintenance activities over the past six months on other plant systems, time did not allow for surveillance of any additional tendons not previously surveilled in PSC's continuing effort to complete at least one surveillance on all accessible PCRV tendons. The revised surveillance schedule, as outlined in Letter P-87234, will accelerate completion of surveillance of all remaining accessible tendons.

2.4 COLLECTIVE TENDON SURVEILLANCE INFORMATION SUMMARIES 2.4.1 Tendons with Noneffective Wires Table 2.4-1 provides a complete summary of all tendon ends surveilled through November 30, 1987 (the effective surveillance cutoff date for this report), which have been observed with noneffective wires, and the number of noneffective wires in each. Table 2.4-1 in this report is I an update of Table 2.4-1 from the July 1987 report (P-87234).

Since the July 1987 report, three(3) additional tendons have been observed with noneffective wire (s): Tendons CI 14.5 and Cli 13.6, each with one(1) noneffective wire on one end, {

and Tendon CM 17.5 with, on one end, one(1) "as-found" i noneffective wire and two(2) additional noneffective wires l which failed during liftoff. None of these three tendons had a documented surveillance prior to the July 1987 report  ;

since original installation in 1970.

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] Fourteen (14) tendons previously surveilled with noneffective wires prior to the July 1987 report were resurveilled within the past six months; of these fourteen tendons, none were observed with an increase in the number of noneffective wires.

To date, 359 of the total 448 PCRV tendons have been surveilled on at least one end since March 1, 1984. Of these 359 tendons surveilled, a total of sixty-one(61) l tendons, or 17.0 percent, have been observed with one or more noneffective wires each. These 61 tendons include l fifty-six(56) tendons with seven(7) or fewer noneffective l wires each and only five(5) tendons with sixteen (16) or more noneffective wires each (these are the five worst-case tendons of Section 2.2 of this report).

2.4.2 Tendon Surveillance Historical Information The PCRV Tendon Surveillance Plan drawings, showing graphical end views, with specific historical surveillance information, of all PCRV tendon ends, have been updated to  ;

include all tendon surveillance through November 30, 1987. l

. These updated drawings, Numbers IA through 10, are included i'. Appendix A of this report. Reference the key on the drawings for an explanation of the information provided for each tendon end.

2.4.3 Number and Percentage of Tendens Surveilled To Date Table 2.4-2 provides a complete summary of the number and percentage of tendons of each type which have had a given combination of liftoff and/or visual surveillance performed on them at least one time between March , 1984 (the approximate start date of increased tendon surveillance),

and November 30, 1987 (the effective surveillance cutoff date for this report). Table 2.4-2 is a revised update of Table 2.4-3 of the July 1987 tendon surveillance report (P-87234).

For the table count, no tendon has been counted more than once. All possible eno combinations of surveillance types, including no surveillance, for any tendon are categorically tabularized. Therefore, the total sum of surveillance (and no surveillance) shown for each tendon type (each column)  ;

equals the total number of tendons of that type in the PCRV.

As observed in Table 2.4-2, 359 of the total 448 PCRV tendons, or 80.1 percent, have had at least a visual inspection on at least one end at least one time since March 1, 1984. This is an increase of 3.8 percent in total tendons surveilled since the last (July 1987) tendon surveillance report.

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Page 22 of 23 fh V The remaining accessible tendons not surveilled to date, all of which are circumferential tendons, will. be included in the groups 'of new tendons for subsequent surveillance periods until all accessible PCRV tendons have been surveilled.

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i APPENDIX A j PCRV TENDON SURVEILLANCE PLAN DRAWINGS Drawing Number Tendon Type I 1A Longitudinal 1B Circumferential Layers 2, 5 and 4  ;

IC Circumferential layers 1, 6 and 3  :

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OVERSIZE DOCUMENT PAGE PULLED SEE APERTURE CARDS 1

NUMBER OF OVERSIZE PAGES FILMED ON APERTURE CARDS J

APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH

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