ML20246K132

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Pcrv Tendon Surveillance Rept for Jul 1989.W/four Oversize Drawings
ML20246K132
Person / Time
Site: Fort Saint Vrain Xcel Energy icon.png
Issue date: 07/31/1989
From:
PUBLIC SERVICE CO. OF COLORADO
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ML20246K120 List:
References
NUDOCS 8907180065
Download: ML20246K132 (29)
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PCRV TENDON SURVEILLANCE REPORT JULY 1989 Fort St. Vrain Nuclear Generating Station Public Service Company of Colorado

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ABSTRACT 1

1 This report is the first twelve-month report to be submitted under the current requirements of the revised surveillance program established to provide continued monitoring of corrosion in the Prestressed Concrete Reactor Vessel (PCRV) prestressing tendons. I Surveillance findings are reported for the following revised surveillance program groups of tendons: (1) control tendons for visual inspection and liftoff testing, (2) "new" tendons for visual

~ inspection and liftoff testing, and (3) worst-case tendons for visual inspection.

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

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

  • Of 20 previously-surveilled "new" tendons, only one showed a slight increase in the number of noneffective wires.
  • One "new" circumferential tendon with no previous surveillance record was found with 19 noneffective wires, which is comparable to any of the 5 routinely-monitored worst-case tendons. A follow-up visual surveillance will be scheduled on this tendon prior to the end of FSV nuclear operations.
  • 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.
  • To date, 405 of the total 448 PCRV tendons, or 90.4 percent, have had a visual inspection on at least one end at least one time since March 1,.1984.
  • Of the 405 tendons surveilled since March 1, 1984, a total of 69, or 17.0 percent, have been observed with noneffective wires.

(' s) These 69 tendons consist of 63 tendons with only 7 or fewer

\~/ noneffective wires each and only 6 tendons with 16 or more noneffective wires each.

I CONTENTS PAGE

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1.0 INTRODUCTION

....................... 1 2.0 PCRV TENDON SURVEILLANCE INFORMATION ........... 1-2.1. FINDINGS OF THE FIRST TWELVE-MONTH REVISED SURVEILLANCE' PROGRAM PERIOD ........ 1 R.1.1 Visual Inspection .............. 2 2.1.1.1 Control Tendons .......... 2 2.1.1.2 New Tendons ............ 2 a 2.1.1.3" Worst-Case Tendons ........ 15 0 2.1.2 Liftoff Testing ............... 16 h 's / 2.1.2.1- Control Tendons .......... 16 2.1.2.2 New Tendons ............ 20 2 .' 2 ' COLLECTIVE TENDON SURVEILLANCE INFORMATION SUMMARIES . ......... .. 21

'2.2.1 Tendons with Noneffective Wires ...... 21 2.2.2 Tendon Surveillance Historical Information . 24 2.2.3 Number and Percentage of Tendons j Surveilled to Date

............. 24 APPENDIX A: PCRV TENDON SURVEILLANCE PLAN DRAWINGS ...... 26 l

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Page 1 of 26

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1.0 INTRODUCTION

i This report is being submi.tted to . comply with the requirements of the revised surveillance program which has been established to continue monitoring corrosion in the Prestressed Concrete Reactor Vessel-(PCRV) prestressing tendons. The requirements for the revised tendon surveillance program were given on Page 4 of previously-submitted Letter P-87234, dated July 20, 1987. The NRC provided approval to implement- the revised program in a letter dated August 30, 1988, from K.'L. Heitner to R. 0.

l Williams (G-88361). PSC notified the NRC of the revised program implementation in Letter P-88342, dated. September 27, 1988, with the first twelve-month. revised program report due approximately July 21, 1989.

This report follows six consecutive semiannual reports i submitted under the original interim surveillance program, the last of which was submitted under Letter P-88300, dated August 19, 1988.

The present submittal- reports the findings of tendon surveillance performed since the August 1988 report; more specifically, the actual tendon surveillance included in this report were performed between February 19 and June 7, O- 1989.

2.0 PCRV TENDON SURVEILLANCE INFORMATION 2.1 FINDINGS OF THE FIRST TWELVE-MONTH REVISED SURVEILLANCE PROGRAM PERIOD As indicated in Section 1.0, the PCRV tendon revised surveillance program scope and requirements were presented in detail in Letter P-87234. The findings of the surveillance performed during the first twelve-month revised surveillance period are reported here. For ease of comparison and cohesiveness from report to report, the tabular, graphical, text and organizational format of findings continue to appear in the same' manner in this report as in the earlier six-month reports submitted under the original interim surveillance program.

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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 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 (P-86042), 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 twelve-month surveillance period, is presented in Table 2.1-1.

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The general observation and discussion of findings' relative to the control tendons provided in Section 2.2.1.1 of the January 1986 report remains applicable here. Based on the line of reaso,ing from this discussion and referring to the findings reported in Table 2.1-1, it should be noted that no new noneffective wires have been observed .in any of the control tendons during this latest surveillance period as compared with previous surveillance. In fact, no now noneffective wires have been observed in any of the twelve (12) control tendons for the four 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 be extremely low or nonexistent and of no immediate concern. j i

2.1.1.2 New Tendons The new tendons (55 total) selected for visual inspection for this first twelve-month revised surveillance period are as follows:

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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 I 05/16/89 L 0 1342 (169) I 07/22/88 L 0 1336 I 11/03/87 L 0 1325 I 05/22/87 L 0 1347 I 11/04/86 L 0 1350 1 06/12/86 L 0 1371 1 10/15/85 L 0 1392 1 10/02/84 L 0 1315 III 05/18/89 L 0 1308 III 06/21/88 L 0 1314 III 10/27/87 L 0 1318 III 05/26/87 L 0 1318.

III 10/29/86 L 0 1318 06/11/86 0 1314

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\- III 10/17/85 L 0 1327 III ~10/02/84 L 0 1275 CO 14.4 II- 03/20/89 L 0 1214 (152) II 05/18/88 L 0 1220 II 09/17/87 L 0 1246 II 04/01/87 L 0 1224 II 10/29/86 L 0 1218 II 06/07/86 L 0 1275 II 12/20/85 L 0 1237 II 10/17/84 L 0 1180 VI 03/23/89 L 0 1161 VI 06/14/88 L 0 1182 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 (continued next page)

Page 4 of 26 , .)

(s,,/\ TABLE 2.1-1~(cont.)

e CONTROL TENDONS-HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

4 Tendon No. Number of (Number of. Tendon- Surveillan'ce Surv. Noneffective Liftoff Orig. Wires) End(1) Date Tyce(2) Wires (3) Load (kips)(4)-

L CM 16.3 III 04/28/89 L 0 1328-(169) III 05/31/88 L 0 1402 III 09/15/87 L 0 1374 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 V 05/10/89 L 0 1364 V 06/10/88 L 0 1370 V 09/15/87 L 0 1349 V 04/29/87 L 0 1360-V 10/16/86 L 0 1299

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V V

06/11/86 12/16/85 L

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0 1372 1373 V 03/26/85 L 0 1368 TIRM2 III-IV 04/13/89 L 0 1331 (169) III-IV 06/01/88 L 0 1358 III-IV' 11/06/87 L 0 1325 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 04/06/89 L 0 1339 VI-I 06/16/88 L 0 1370 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 VI-I 12/17/85 L 0 1380 VI-I 02/I3/85 L 0 1370 (continued next page)

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. TABLE 2.1-1 (cont.)

CONTROL TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

Tendon No. . Number of (Number of -Tendon Surveillance Sury. Noneffective Liftoff

. Orig. Wires) End(1) Dat'e Type (2) Wires (3) Load (kips)(4)

BIRM4 III-IV 05/24/89 L 0 1348 (169) III-IV 06/23/88 V 0 N/A III-IV 11/02/87 -L 0 1357 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 05/17/89 L 0 1312 VI-I 06/30/88 L 0 1299 VI-I 11/02/87 L 0 1333 i

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/ VI-I VI-I VI-I 03/16/87 11/05/86 04/29/86 L

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0 1289 1306 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 03/16/89 V 0 N/A

.(169) III-IV 03/15/88 V '0 N/A III-IV 11/03/87 V 0 N/A III-IV 03/09/87 V 0 N/A III-IV 10/31/86 V O N/A III-IV 04/18/86 L 0 1388 III-IV 01/03/86 L 0 1352 i

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 j

1 Os (continued next page)

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() - TABLE 2.1-1 (cont.)

. . CONTROL TENDONS HISTORICAL SURVEILLANCE INFORMATION $UMMARY Tenden No. '

Number of (Number of Tendon Surveillance Sury. Noneffective Liftoff.

, Orio. Wires)' End(1) Date lype(2) ' Wires (3) Load (kips)(4)

BILM3 (cont.) VI-I. 03/16/89 V 1 N/A VI-I 03/13/88 V 1 N/A-VI-I- 11/04/87 V 1- N/A 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 06/06/89 L 7 1384 (169) Top 03/28/88 L 7 1366 Top 07/16/87 L 7 1370

- (3 Top 02/05/87 L 7 1375'

(/ - To, 09/25/86 L 7 1305 Top 05/24/86 L 7 1413 Top. 06/20/85 L 7 1388 Top 01/17/85 V 7 N/A Top 04/09/84 L 3 1344 Top 03/28/84 V 3 N/A

.VI-20 Top 06/06/89 L 0 1432 (169) Top 03/29/88 L 0 1442 Top 07/17/87 L 0 1396 Top 02/03/87 L 0 1432 Top. 09/25/86 L 0 1391 Top 0F./24/86 L 0 1459 Top 06/21/85 L 0 1437 Top 01/30/85 V 3 N/A Top 04/17/84 L 0 1443 Top 03/27/84 V N/R N/A (p)

(continued next page) ,

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l ' CONTROL TENDONS-L HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

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

L VM-20 Top 06/06/89 V 0 N/A (169) Top M/29/88 V 0' N/A Top 07/17/87 V. 0 N/A Top 02/03/87 V 0 N/A LTop 09/24/86 V 0 N/A Top 05/24/86 V 0 N/A Top :06/21/85 V 0 N/A Top 01/30/85 V 0 N/A Top 04/17/84 L 0 1449-Top 03/27/84 / N/R N/A VM-37 Top- 06/07/89 V 1 N/A l (169) Top- 03/30/88 V 1 N/A Top 07/23/87- V 1 N/A

(~ Top Top 02/09/87 09/24/86 V 1 N/A N/A

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V 1 Top ,06/16/86 V 1 -N/A Top 06/19/85 V '- 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 l

VI-40. Top 05/30/89 V' O N/A (169) Top 03/31/88 V 0 N/A Top 07/24/37 V 0 N/A Top 02/09/87 V 0 N/A Top 09/24/86 V 0 N/A I

Top 06/04/86 V 0 N/A Top 06/18/85 V 0 N/A Top 01/30/85 V 0 N/A Top 04/19/84 L 0 1438

. Top 03/28/84 V N/R N/A h

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()- TABLE 2.1-1 (cont.)-

CONTROL TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of.

(Number of Tendon Surveillance Suiv. ' Noneffective Lif tof f Orig. Wires) End(1): Date Type (2) Wires (3) ' Load (kips)(4)

VM Top 06/05/89 L 0 1404 (169) Top 03/31/88 L 0 1439 Top 07/24/87 L 0 1416 Top 02/09/87 L 0 1416 Top 09/26/86 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/B4 L 0 1433

' Top 03/28/84 V N/R N.'A

,.3 k) _ NOTES-(by reference numberj:

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: - Li f tof f 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.

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Page 9 of 26 f~y Top Bottom Circumferential Crosshead Crosshead Longitudinal

.C0 1.3 CM 18.5 TORM2 BOLU4 VI-3 CO 2.3 CO 18.5 BIRU4- VM-3 CI 7.3 CI 19.5 BORU4 VM-4 CM 7.3 CM 19.5 VM-15

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CO 7.3 CM 1.6 VM-18 CI 13.3 CD 1.6 VI-21 CO 15.3 CI 7.6 VM-21 l CI 1.4 CM 7.6 V0-21 u CT. 2.4 CO 7.6 VM-26 CI 11.4 CI 8.6 VM-27 CM 11.4 CI 9.6 VI-41 CO 11.4 CM 9.6 V0-42 CI 18.4 C0 9 6 CM 18.4 CI 10.6

! CO 18.4 CM 10.6 CO 1.5 CO.10.6 CI 2.5 CO 11.6 C0 12.5 CM IL 6 CD 17.5 CO l'7.6 CI 18.5 O A summary of the latest surveillance information gathered

,V during this first twelve-month revised visual-surveillance period for each end of each new tendon is presented in Table 2.1-2. Those tendon ends surveilled for the first time

-since original installation in the year 1970 are noted in the table (all are circumferential tendons).

The number of new tendons for visual inspectica of each tendon type' observed with noneffective wires a're as follows:

six(6) out of thirty-nine(39) new circumferential, one(.1) out of'one(1) new top crosshead, one(1) 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 fifty-five(55) new tendons selected for >

visual inspection, twenty (20) have had at least one previous surveillance on at least one end since March 1984 (the date of discovery of the tendon corrosion problems). Out of these 20 previously-surveilled new tentens, only one has  ;

shown an increase in the number of nonef' ive wires. This one tendon, TORM2, had an increase from zero(0) noneffective wires when initially surveilled in February 1985 to two(2) noneffective wires observed during the current surveillance i of April 1989. This increase to two(2) noneffective wires i is considered very minor in nature when compared to the I

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evaluation criterion of 34 or more noneffective wires for crosshead tendons as given in the Updated FSAR, Section j 5.6.2.7.  ;

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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 (2) Wires Load (kips)(3)

CD 1.3 III 02/20/89(4) V 0 N/A (169) V 02/20/89(4) V 0 N/A CO 2.3 .III 02/20/89{4) V 0 N/A (169) V 02/20/89(4) V- 0 N/A

- CI 7. 3 III 05/12/89(4) V O N/A (152) V 03/09/89(4) V 0 N/A CM 7.3 III 05/12/89(4) V 0 N/A (152) V 03/09/89(4) V 0 N/A C0 7.3 III 03/09/89(4) V 0 N/A 7 (152)- V 03/09/89(4) V 0- N/A CI 13.3 III 05/05/89(4) L 0 1200 (152) V 05/09/89(4) L 0 1220 CO 15.3 III 04/28/89(4) V 0 N/A (152) V 05/09/89(4) V 0 N/A CI 1.4 II 03/03/89 V 0 N/A (169) VI 03/03/89 V 0 N/A CI 2.4 II 03/03/89.(4) V 0 ~N/A (169) VI 03/03/89(4) V 0 N/A .;

C1 11.4 II 03/21/89(4) L 0 1121 (152) VI 03/22/89(4) V 0 N/A CM 11.4 II 03/21/89(4) L 0 1185 (152) VI 03/22/89(4) L 0 1185 CD 11.4 II 03/21/89(4) V 0 N/A (152) VI 03/22/89(4) L 0 1177 CI 18.4 II 03/31/89(4) V 19 N/A (169) VI 03/28/89(4) L 0 1349 (continued next page)

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i,g8 TABLE 2.1-2 (cont.)

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)

CM 18.4 II 03/31/89(4) L 2 1315 (169) VI 03/28/89(4) L 0 1355 C0 18.4 II 03/31/89 L 0 1357 (169) . VI 03/29/89(4) L 0 1392 CO 1.5 I 02/19/89(4) V 1 N/A (169) V 02/19/89(4) V 0 N/A CI 2.5 I 02/19/89(4) V 1 N/A (169) V 02/19/89(4) V 0 N/A CO 12.5- I 03/14/89(4) V 0 N/A (169) V 03/14/89 V 0 N/A g-() CO 17.5 I 03/14/89(4) V 0 N/A (169) V 03/14/89(4) V 0 N/A CI 18.5 I 04/04/89(4) L 0 1347 (169) 'V 04/10/89 L 0 1379 CM 18.5 I 04/04/89(4) L 0 1368 (169) V 04/11/89(4) V 0 N/A -

CO 18.5 'I 04/04/89(4) V 0 N/A (169) V 04/11/89(4) L 0 1323 CI 19,5 I 04/04/89(4) V 0 N/A (169) V 04/11/89 V 0 N/A CM 19.5 1 04/04/89(4) V 0 N/A (169) V 04/11/89(4) V 0 N/A CM 1.6 II 03/03/89(4) V 0 N/A (169) IV 03/03/89(4) V 0 N/A CO 1.6 II 03/03/89 V 0 N/A

_(169) IV 03/03/89 V 0 N/A

-CI 7.6 II 03/08/89(4) V 0 N/A

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(152) IV 03/06/89(4) V 0 N/A (continued next page)

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d . TABLE 2.1-2 (cont.)

NEW TENDONS LATEST SURVEILLANCE INF0fd% TION

SUMMARY

Tendon No. .

. Number of (Number of Tendon Surveillance Surv, Noneffective Liftoff Orig.~ Wires) End(1) Date Type (2) _ Wires Load (kips)(3)

CM 7.6 II 03/08/89(4) V 0 N/A (152) 'IV 03/08/89(4) V 0 N/A C0 7.6 II 03/08/89(4) V 0 N/A (152) IV 03/08/89(4) V 0 N/A CI 8.6 II 03/15/89(4) V 0 N/A (152) IV 03/13/89(4) V 0 N/A CI 9.6 II 03/10/89(4) V 0 N/A (152) IV 03/13/89(4) V 0 N/A CM 9.6 II 05/12/89(4) V 0 N/A (152) IV. 03/13/89(4) V 0 N/A C0 9.6 II 03/10/89(4) V 0 N/A (152) IV 03/13/89(4) V 0 N/A CI 10.6 II 03/07/89(4) V 0 N/A (152) IV 03/07/89(4) V 0 N/A CM 10.6 II 03/07/89(4) V 0 N/A (152) IV 03/07/89(4) V 0 N/A CO 10.6(5) IV 03/07/89(4) V 0 N/A (152)

C0 11.6 II 0'5/12/89(4) L 0 1188 (152) IV 05/11/89 L 0 1152 CM 17.6 II 04/27/89(4) V 1 N/A (169) IV 04/25/89(4) L 0 1344 CO 17.6 II 04/27/89 L 0 1356 (169) IV 04/14/89 L 1* 1384 TORM2 III-IV- 04/13/89 V 2 N/A (169) VI-I M/06/89 L 0 1380 J

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Page 13 of 26 ,

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) 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)

BOLU4 I-II 03/15/89 V 0 N/A

, (169) IV-V 03/16/89 V 0- N/A BIRU4 I-II 03/15/89 V 0 N/A (169) IV-V 03/16/89 V 0 N/A BORU4 I-II 05/15/89 L 0 1320 (169) IV-V 05/23/89 L 3* -1308 VI-3(169) Top 06/05/89 V 0 N/A VM-3(169) Top 06/05/89 V 0 N/A VM-4(169) Top 06/05/89 V 0 N/A rT U VM-15(169) ' Top 06/06/89 L 0 1428 VM-18(169) Top 06/06/89 L 0 1428 VI-21(169) Top 06/06/89 V 0 N/A VM-21(169) Top 06/05/89 V 0 N/A.

V0-21(169) Top 06/06/89 V 0 N/A VM-26(169) Top' 06/07/89 L 0 1420 VM-27(169) Top 06/07/89 L 0 1420 VI 1(169) Top 05/26/89 V 0 N/A  ;

V0-42(169) Top 06/05/89 V 0 N/A NOTES (by reference number):

1) Indicated by PCRV buttress number. If between two buttresses, I indicated by both nearest buttress numbers. Longitudinal tendons I indicated by " Top" or " Bottom". j fy b (continued next page) ]

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.i )' . TABLE 2.1-2 (cont.)

NEW TENDONS

,. LATEST SURVEILLANCE INFORMATION

SUMMARY

NOTES (cont.):

2) L: Liftoff eid. 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 or'iginal installation in 1970,

5) End II of Tendon CO 10.6 is not accessible for inspection.

These numbers of noneffective wires were identified in previous surveillance reports and have not changed.

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b L' l0f' the- thirty-five(35).. remaining '.new. tendons for visual- m L Tinspection with no previous surveillance record on- either end, 'all' of which are circumferential tendons,. five(5) were-observed.with noneffective wire (s): ' Tendons CI. 18.4, CM 18.4, CO 1.5, CI 2.5 and CM 17.6, with. nineteen (19), two(2),

one(1), one(1) and one(1) noneffective' wires, respectively,.

, on one end only each. These noneffective. wire ~ numbers'for.

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a11'except Tendon CI 18.4 are well within the surveillance results for noneffecti've wires found previously in other '

circumferential tendons.

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3 Nineteen (19) noneffective wires in -Tendon CI 18.4 is significant; however, this number still falls well below the 34 or more noneffective-wire criterion for circumferential head tendons as given in Section 5.6.2.7 of the ' Updated-FSAR. Additionally, this relatively high number of noneffective wires is not without precedent, being comparable to any one of the five previously-discovered .and routinely-monitored worst-case. tendons (Reference Section 2.1.1.3). A liftoff performed on Tendon CI 18.4 at the end' opposite the noneffective wires resulted in a measured tendon. load of 1349 kips, 'well above the minimum liftoff load evaluation criterion'of 765 kips for circumferential head tendons given in the Updated FSAR,-Section 5.6.2.7; LJ .From visual observation of the failed wires removed from,the tendon, ranging in length from approximately.4 inches'to 10 inches, it is apparent from the buildup of corrosion on the.

fracture surfaces.that the wires'hav'e been in a broke'n' state-for a. considerable period of: time. These observations (length'of-failed wires and age of corrosion) are consistent with those for the other five- worst-case tendons and the vast majority- of all, other ' tendons observed with noneffective wires. It'is believed that-the major corrosion processes 'resulting in tendon wire breakage occurred during lthe ea rly ; state .of tendon life- following initial installation in.the year.1970.

A fol_l ow-up visual surveillance of Tendon CI 18.4, End II, will be scheduled for performance prior to the end of FSV nuclear operations (no later than June 30,-1990). The results of this surveillance will be reported along with the surveillance findings of the other five worst-case tendons in the final tendon report planned for submittal approximately one month after final PCRV depressurization

-(Reference Letter P-89026, dated January 20,1989).

2.1.1.3 Worst-Case Tendons The worst-case tendon group is that group of tendons established for periodic visual inspection in PSC Letter

'.P-86491, dated July 29, 1986, made up of the five(5) PCRV O tendons which possess significant' numbers of noneffective wires. This group consists of the following tendons:

5

~

4., Page 16 of 26'

..n grst-C Tendons Cl, . 5 Q CM 4.6 BILU3 BILU4 VM-30 m ~

S> A historical su, ;11ance information summary including the findings during this latest (first tweive-month) surveillance period for each end of each worst-case tendon is presented in Table 2.1-3.

The number of noneffective wires has not increased in any.of the worst-case tendons compared.to the numbers reported in the previous four surveillance reports for the first through fourth semiannual worst-case tendon surveillance periods.

Furthermore, there has been no incrt 'e in noneffective wires in the worst-case tendons for a period of at- le a s'.

four years (three years for Tendon CM 4.6, first surveilled 3 in March 1986) which continues to demonstrate that the corrosion rate is at a. very low or nonexistent level in these tendons.

Approximately one-third quart of water was drained from

()3

\, Tendon CM 4.6, which is consistent with previous six-month periodic accumulations. It is apparent from the on going lack of increase in noneffective wires in Tendon CM 4.6 that this continuous finding' of moisture has not been significantly detrimental' to this tendon's structural -!

effectiveness. In fact, all worst-case . tendon; remain j effective members of the PCRV tendon system. l 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 j identity and quantity during each period of the surveillance program. The tendons chosen as control tendons for liftoff testing, included in the control group for visual inspection, were selected during the first six-month interim surveillance period and initially presented in the January 4 1986 report. These liftoff control tendons are as follows: I Top Bottom Circumferential Crosshead Crosshead Longitudinal CM 1.1 TIRM2 BIRM4 VM-10 CO 14.4 (load cell) VI-20

- 3 CM 16.3 VM-40

l.

(.

, Page 17'of 26 ,

) TABLE 2.1-3 WORST-CASL-TENDONS HISTORICAL SURVI~-Jf.NCE INFORMATION

SUMMARY

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

CO 2 ' I 02/19/89 V 16 N/A (169, I 03/11/88 V 16 N/A I 09/30/87 V 16 N/A 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 02/19/89 V 2 N/A V 03/11/88 V 2 N/A V 09/30/S7 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

,O Aj CM 4.6 -11 05/26/89 V 20 N/A (169) II 07/23/88 V 20 N/A II 11/24/87 V 20 N/A II 05/27/87 V 20 N/A II 11/14/86 V 20 N/A II 06/20/86 V 20 N/A II 04/08/86 L 20 1235 I IV l

05/25/89 V 0 N/A IV 07/23/88 V 0 N/A 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 IV 04/08/86 V 0 N/A BILU3 I-II 03/15/89 V 18 N/A i (169) I-II 03/16/88 V 18 N/A i I-II 11/06/87 V 18 N/A l I-11 02/20/87 V 18 N/A I-II 11/14/86 V 18 N/A I-II 05/15/86 L 18 1016 I-II 03/16/85 V 16 N/A I-II 08/14/84 L 15 975 '

O

..g (continued next page)

v Page 18 of 26 ,

, . ]%

( ,)' TABLE 2.1-3 (cont. )

WORST-CAEE TENDONS HISTORICAL SURVEILLANCE $ INFORM TION

SUMMARY

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

BILU3(cont.) IV-V 03/16/89 V 20 N/A (169) IV-V 03/15'88 V 20 N/A IV-V 11/06/87 V 20 N/A IV-V 03/02/87 V 20 N /A IV-V 11/14/86 V 20- N/A L

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 IV-V 04/13/84 L 8 1228 BILU4 I-Il 03/15/89 V 28 N/A (169) 1-II 03/16/88 V 28 N/A I-II 11/06/87 V 28 N/A 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-II 05/15/04 L 17 1150 I-II 04/01/84 V 17 N/A IV-V 03/16/89 V 3 N/A IV"V 03/15/88 V 3 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 VM-30 Top 06/07/89 V 22 N/A (169) Top 03/30/88 V 22 N/A Top 07/22/87 V 22 N/A Top 02/11/87 _V 22 N/A Top 09/25/86 V 22 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 O

(continued next page)

r v.

Page 19 of 26 . ,

q Q .- TABLE 2.1-3 (cont.-)

WORST-CASE TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

0: .

NOTES-(by reference number):

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

2) L: Liftoff. and. visual inspection of anchor assemtsly 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 l (^j .liftcff tett performed. -

.L/

i u

r-.

Page 20 of 26

'/;

I I D-

I The most recent and historical measured liftoff loads for j l each of these liftoff control tendons is presented in Table 2,1-1. The load cell reading during the most recent liftuff on Tendon BIRM4 was 1274 kips, which compares favorably with an average of 1263 kips from six previous readings.

1 The tendon liftoff loads measured to date for the control I tendons, in all cases, continue to be well above the minimum liftoff load evaluation criteria for each tendon type as specified in the Updated FSAR, Section 5.6.2.7. Moreover, the ' measured lif toff loads do not exhibit any trend towards significant load relaxation or lot.d loss. The differences  ;

in measured liftoff load values noted #or each control  !

tendon from one liftoff to the next are ..' chin an acceptable and expected range of measurement system inaccuracies.

2.1.2.2 New Tendons As part of the PCRV tendon revised surveillance program requirements, a new tendon group is to be randcmly selected

.and liftoff tested during each twenty-four(24)-month program period. The new tendons. selected for liftoff testing may be included in any of the new tendon groups selected for twelve-month visual inspections during the 24-month period.

't

%s,, Under the current program, liftoff surveillance findings for the new tendons for liftoff' testing for the first 24-month

't- revised surveillance. period, covering July 21, 1988, to July 21, 1990, would have been reported in July 1990. However, due to tne planned cessation 'of nuclear. operations at FSV by mid-1990, only the control and worst-case tendons will be sLrveilled following submittal of tne current surveillance report (Reference Letter p-39026, dated January 20, 1989). _

Therefore, the new tendons for lift'off testing surveilled to date to have ocen included as part of the planned first 24-month liftoff surveillance period are presented with surveillance findings in this report. These new tendons, randomly se ected for lif toff testing, are as follows:

Top Bottom Circumferential Crosshead Crosshead Longitudinal CI 13.3 CI 18.5 TORM2 BORU4 VM-15 Cl 12.4 CM 18.5 VM-18 CM 11.4 CO 18.5 VM-26 CD 11.4 CO 11.6 VM-27 CI 18.4 CM 17.6 CM 18.4 CO 17.6 CO 18.4 m

c - _ _ _ _ - _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _

Sc'

  • Page 21 of 26 L

(q

' '") ' All of. the above new tendons for liftoff testing are included in the new tendon group for visual inspection. The most recent measured liftoff load for each of these liftoff.

new tendons is presented in Table 2.1-2.

Out of the total of nineteen (19) new tendons selected for liftoff testing, six(6) tendons have had a previcus liftoff test' since March 1984. Of the 6.new tendons for liftoff testing with a previous liftoff test, none have shown any signs of- significant load loss due to wire relaxation or tendon degradation. Moreover, the liftoff loads measured to date for all of the liftoff new tendons are well above the minimum liftoff load evaluation criteria for each tendon type as specified in the Updated FSAR, Section 5.6.2.7.

2.2 COLLECTIVE TENDON SURVEILLANCE INFORMATION SUMMARIES 2.2.1 Tendons with Noneffective Wires Table 2.2-1 provides a complete summary of all tendon ends surveilled through June 7,1989 (the effective surveillance cutoff date for th s report), which have been observed with noneffective wires, and the number of noneffective wires in each. Table 2.2-1 in this report is an update of Table

. 2.4-1 from the August 1988 report (P-88300).

Since the August 1988 report, six(6) additional tendons have been observed with noneffective wire (s): Tendons TORM2, CI 18.4, CM 18.4, C0 1.5, CI 2.5 and CM 17.6, with wo(2),

nineteen (19), two(2), one(1), one(1) and one(1) noneffective wires on one end each, respectively. All except Tendon TORM2 have not had a documented surveillance prior to the current surveillance since original installation in 1970.

Eleven (11) tendons previously surveilled with noneffective wires prior to the current surveillance were resurveilled within the past s'x months; of these eleven tendons, only one was observed w '. +.h an increase in the number of noneffective wires: 6 don TORM2 showed an increase from zero to two noneffective wires since its initial surveillance in February 1985.

To date, 405 of the total 448 PCRV tendons have been surveilled on at least one end since March 1, 1984. Of u

these 405 tendons survei'il ed , a total of sixty-nine(69) tendons, or 17.0 percent, have been observed with one or more . noneffective wires each. These 69 tendons consist of s sixty-three(C3) tendons with seven(7) or fewer noneffective wires each and six(6) tendons with sixteen (16) or more noneffective wires each.

I

'.. '.. j

Page 22 of.26 i

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1

Page 84 of 26-2.2.2 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 June 7, 1989.

These. updated drawings, Numbers 1A through 10, are included

.in Appendix A of this report. Reference the key on the-drawings for an explanation of the information provided for each tendon end.

2.2.3 Number and Percentage of Tendons Surve111ed To Date Table 2.2-2 provides a complete summary of the number and percentage of tendons of each-type which have had a given combination of lif toff and/or visual surveillance perfor.ned on them at least one time between March 1, 1984 (the approximate start date of increased tendon surveillance 5),

and June 7, 1989 (the effective surveillance cutoff date for this report). Table 2.2-2 is a revised update of Table 2.4-2 of the August 1988 tendon surveillance report (P-88300).

For the table count, no tendon has been counted more than O once. All possible end' combinations of surveillance types, V including no surveillance, for any tendon are categorically tabularized. Therefore, the.totc1 sum of surveillance (and no surveillance) shown for eauh tendon type (each column) equals the total number of tendons of that type in the PCRV.

.As observed in Table 2.2-2, 405 of' the total 448 PCRV tendons, or 90.4 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 9.5 percent in total tendons surveilled since the last (August 1988) tendon surveillance report. All remaining accessible tendons not surveilled to date are circumferential tendons.

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m APPENDIX A PCRV TENDON SURVEILLANCE PLAN DRAWINGS Drawing Number Tendon Type 1A Longitudinal IB Circumferentiai Layers 2, 5 and 4 i'

IC Circumferential Layers 1, 6 and 3 ID Top Crosshead Bottom Crosshead B

_.mm__2-. ____--, ...

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4, 4

to  ;

LOVERSIZE "

DOCUMENT PAGE PULLED

.i SEE' APERTURE CARDS;

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NUMBER OF OVERSIZE PAGES FILMED ON APERTURE CARDS ~

' APERTURE CARD /MARD COPY AVAILABLE FROM ,

QECORDS AND REPORTS MANAGEMENT BRANCM o-l l

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