Text

Pcrv Tendon Interim Surveillance Rept. W/Four Oversize Drawings
	ML20154E098
Person / Time
Site:	Fort Saint Vrain
Issue date:	08/31/1988
From:	; PUBLIC SERVICE CO. OF COLORADO
To:	;
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ML20154E076	List: ML20154E072; ML20154E083; ML20154E098; ML20266C722; ML20266C726; ML20266C730; ML20266C733;
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PCRV TENDON i INTERE CURVEILLANCE REPORT i

i i AUGUST 1988 i

j Fort St. Vrain Nuclear Generating Station

Public Service Company of Coloraco 1

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hDR ADOCK 05000267 i PDC

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ABSTRACT This report is the sixth 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.

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

The major findings, facts and conclusions reported herein are summari.'.ed below:

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

Based on the control tendon surveillance results to date, the t rate of corrosion in the tendon system continues to be extremely

low or nonexistent and of no immediate concern.

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

Based upon tne lack of any increase in tne number of noneffective wires, there is no indication that corrosion is continuing in any of tne 33 previously-surveilled "new" tendons.

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

No increase in noneffective wires wrs observed in Tendon CM 4.6.

Approximately one-third quart of water was drained from Tenden CM 4.6, which is the same as the previous six-month amount.

To date, 370 of the total 448 PCRV tendons, or 82.6 percent, have had a visual inspection on at least one end at least one time since March 1, 1994 3

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Of the 370 tendons surveilled since March 1, 1984, a total of 63, (V or 17.0 percent, have been observed with noneffective wires.

These 63 tendons include 58 tendons with only 7 or fewer noneffective wires each and only 5 tendons with 16 or more noneffective wires each.

Tendon surveillance results continue to demonstrate that, left in their present condition, every PCRV tendon will likely sustain load above the rainimum required lead for many years to come.

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1.0 INTRODUCTION

. . . ... ................. 1 i

2.0 PCRV TENDON SURVEILLANCE INFORMATION ... ... ... 1 i 2.1 FINDINGS OF THE SIXTH SIX-MONTH i INTERIM SURVEILLANCE PROGRAM PERIOD . ....... 1 i i

l 2.1.1 Visual Inspection ............. . 2

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2.1.1.1 Control Tendons ... ....... 2 l 2.1.1.2 New Tendons . ... .... ... S 2.1.2 Liftoff Testing .... ........... 12 2.1.2.1 Control Tendons ... ....... 12 l

() 2.1.2.2 New Tendons ..... ....... 13 2.2 WORST-CASE TENDON SURVEILLANCES . . ........ 13 j l

2.2.1 Tend'en CM 4.6 ............ .... 14 2.3 SUPPLEMENTAL TENDON SLAVEILLANCE ....... ... 18 2.4 COLLECTIVE TENDON SURVEILLANCE INFORMATION SUMMARIES ........ ... .... 18 2.4.1 Tendons with Noneffective Wires ....... 18 2.4.2 Tendon Surveillance Historical Information . 21 2.4.3 Nu-cer and Percentage of Tendons Surveilled to Date .... .. .... . .. 21 ADPENDIX A: PCRV TENDON SURVEILLANCE PLAN ORAW!fras ... ... 24

Page 1 of 24

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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 sixth consecutive semiannual report to be submitted under this program; the first through fifth reports were submitted under Letters P-86042 (January 22,1986), P-86463 (July 18, 1986), P-87021 (January 19, 1987), P-87234 (July 20, 1987) and P-88002 (January 8,1988), 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 surveillances

performed curing each six-month interval to be reported at the end of each period.

i Based upon continuing favorable surveillance results showing

. virtually no progression of corrosion, Public Service Company of Colorado (PSC) uelieves it very appropriate to convert to an annual surveillance and reporting schedule as proposed and justified in Letter P-87234, dated July 20, 1987 (for ease of reference, included as Attachment 1 to the Cover Letter P-88300 for this report).

l The present submittal reprrts the findings of tendon surveillances performed since the January 1988 report; more specifically,, the actual tendon surveillances included in this report were performed between March 1 and July 23, 1988. i i

In addition to the control and new tendon groups as part of '

, the interim surveillance program, this report also covers i the findings of the fourth semiannual visual surveillances j i 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.

4 2.0 PCRV TENOCN SURVEILLANCE INFORMATION 2.1 FINDINGS OF THE SIXTH $1X-MONTH INTERIM $URVEILLANCE PROGRAM PERIOD l

The PCRV tendon interim surveillance program scope and j requirements were discussed in detail in Section 2.1 of the January 1986 report (P-86042). The fineting s of the j surveillances perforced during the sixth $ 1 x-r.1n t h interim surveillance period are reported here. For ease of )

comparison and cohesiveness from report to report, the I p tabular, graphical, text and organi:4tional format of )

v findings continue to appear in the same manner in this '

report as in the earlier reports.

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Page 2 of 24 s 2.1.1 Visual Inspec'.lon 2.1.1.1 Control Tendons The control tendon group for visual inspection is that groi.p of tendons which, once selected, remains t: same for each semiannual visual inspection period. The tendons chosen as control tendons for visuc1 inspection, selected during the 1 first six-month interim surveillance period and initially presented in the January 1936 report, are as follows:

Top Bottom Circumferential Crosshead Crosshead Loncitudinal 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 tenoon, including the findings during this latest six-month surveillance period, is presented in table 2.1-1.

The general observation and discussion of findings relative l to the control tendons provided in Section P. 2.1.1 of the

! January 1986 report (P-86042) remains applicable here.

Based on the line of reasoning from this discussion and

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, referring to tne findings reported in Table 2.1-1, it should 1 be noted that no new noneffective wires have been observed in any of the control tendons curing this latest (sixth) i semianr.ual surveillance period as compared with previous surveillances. In fact, no new noneffective wires have been ;

ooserved in any Of the twelve (12) control tendons fer the :

j three year period since the start o' the interim i surveillance program in June 1985.

! Based on the control tendon surveillance results to date, l I '

the rate of corrosion in the tendon system continues to be l extremely low or nonexis:ent and of no immediate concern.

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Page 3 of 24 TABLE 2.1-1 CONTROL TENDONS

, HISTORICAL SURVEILLARU INFORMATION St.WMARY ,

i Tendon No, Number of (Number of Tendon Surveillance Sury. 14eneffective Liftoff i Orig. Wires) End(1) Date Type (2) Wires (H Load (kips)(4)

CM 1.1 I 07/22/88 L 0 1336 (169) I 11/03/87 L 0 1325 4

I 05/22/87 L 0 1347 .

i I 11/04/86 L 0 1350

I 06/12/86 L 0 1371

! I 10/15/85 L 0 1392 I 10/02/84 L 0 1315 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 ;

, III 06/11/86 L 0 1314 :

III 10/17/85 L 0 1327 ,

III 10/02/84 L 0 1275 l I :

J CO 14.4 II 05/18/88 L 0 1220 :

) (152) II 09/17/87 L 0 1246 j II , 04/01/87 L 0 1224 7 II 10/29/86 L 0 1218 i.

i II 06/07/86 L 0 1275 I

II 12/20/85 L 0 1237 ,

II 10/17/84 L 0 1180 ;

i VI 06/14/85 L 0 1182 j VI 09/19/87 L 0 1160 '

VI 04/10/87 L 0 1175 VI 10/24/86 L 0 1167 t i

VI 06/09/86 L 0 1208 i V! 12/19/85 L 0 1196 VI 10/17/84 L 0 1150

! CM 16.3 III 05/31/88 L 0 1402 !

(169) III 09/15/87 L 0 1374 i

. III 05/01/87 L 0 1379 !

! !!I 09/29/86 L 0 1310

III 06/07/86 L 0 1387 i III 12/13/85 L 0 1380 '

, III 03/25/S5 L 0 1352 l i

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Page 4 of 24 TABLE 2.1-1 (cont.)

I CONTROL TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

, Tendon No. Number of (Num::er of Tendon Surveillance Surv. Noneffective Liftoff ,

J Orig. Wires) End(1) Date Type (2) Wires (3) load (kios)(4) .

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CM 16,3 (cont.) V 06/10/88 L 0 1370 (169) V 09/15/87 L 0 1349 V 04/29/87 L 0 1360 V 10/16/86 L 0 1299 V 06/11/86 L 0 1372 V 12/16/85 L 0 1373

! V 03/26/85 L 0 1368 TIRM2 III-IV 06/01/88 L 0 1358 '

d (169) III-IV 11/06/87 L 0 1325 III-IV 05/13/87 L 0 1376 l III-IV 10/24/86 L 0 1359 j III-IV 05/21/86 L 0 1392 l III-IV 12/18/85 L 0 1377 l

III-IV 02/05/85 L 0 1364 ,

VI-I 06/16/88 L 0 1370 ;

VI-I 11/05/87 L 0 1353 t VI I 05/19/87 L 0 1368 i l VI-I 10/21/S6 L 0 1281 VI-I 05/20/86 L u 1391 r i VI I 12/17/85 L 0 1380 !

t VI-I 02/13/85 L 0 1370 l

BIRM4 III-IV 06/23/88 V 0 N/A i (169) III-IV 11/02/87 L 0 1357 l

'l !!I-IV 03/09/87 L 0 1338 ;

III-IV 10/31/86 L 0 1363 III-IV 04/18/86 L 0 1395 4

III-IV 12/30/85 L 0 1372 III-IV 03/85 V 0 N/A i III-IV 09/11/84 L N/R 1291 III-IV 04/01/84 V N/R N/A '

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TABLE 2.1-1 (cont.)

CONTROL TENDONS HISTORICAL SURVEILLANCE ~IIff6RMATION

SUMMARY

Tendon No. Number of t (Number of Tendon Surveillance Sury. Noneffective Liftoff ;

Orio. Wires) End(i) Date Type (2) Wires (3) Load (kips)(4)

BIRM4 (cont.) VI-I 06/30/88 L 0 1299 (lead Cell) VI-I 11/02/87 L 0 1333 VI-I 03/16/87 L 0 3289 VI-I 11/05/86 L 0 1306 VI-I 04/29/86 L 0 1364

VI-1 11/27/85 L 0 1344 l VI-I 03/85 V 0 N/A ,

VI-I i 09/11/84 L N/R 1307 4

VI-I 04/01/84 V N/R N/A VI-I 12/71 V N/R N/A '

BILM3 III-IV 03/15/88 V 0 N/A (169) III-IV 11/03/87 V 0 N/A j 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 t i

III-IV 04/01/84 V N/R N/A VI-I 03/13/88 V 1 N/A VI-I 11/04/87 V 1 N/A I

VI-I 03/16/87 V 1 N/A

) VI-I 11/07/86 V 1 N/A VI-! 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 i

i VM-10 Top 03/28/88 L 7 1366 !

(169) Tep 07/16/87 L 7 1370 ;

Top 02/05/87 L 7 1375 :

! Top 09/25/86 L 7 1305

! Top 05/24/86 L 7 1413 ;

Top 06/70/85 L 7 1388 '

Top 01/17/85 V 7 N/A i Top 04/09/84 L 3 1344 i Top 03/28/84 N/A V 3 (continued next page) l l l i 1

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TABLE 2.1-1 (cont.)

CONTROL TENDONS j HISTORICAL SURVEILLANCE INF0lMATION

SUMMARY

l Tendon No. Number of

(Number of Tendon Surveillance Sury. Noneffective Liftoff Orio. Wires) End(D date Type (2) Wires (3) Load (kips)(4)

I VI-20 Top 03/29/88 L 0 1442 (169) Top 07/17/87 L 0 1396 Top 02/03/87 L 0 1432

Top 09/25/86 L 0 1391 1 Top 05/24/86 L 0 1459 j Top 06/21/85 L 0 1437 i

! Top 01/30/85 V 0 N/A I 04/17/84 Top L 0 1443 Top 03/27/84 V N/R N/A l

VM-20 Top 03/29/88 V 0 N/A (169) Top 07/17/87 V 0 N/A i Top 02/03/87 V 0 N/A Top 09/24/86 V 0 N/A Top 05/24/86 V 0 N/A !

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Top 06/21/?5 V 0 N/A 1 Top 01/30.'65 V 0 N/A i Top 04/17/84 L 0 1449 ;

Top , 03/27/84 V N/R N/A VM-37 Top 03/30<8S V 1 N/A !

i' (169) Top 07/23/87 V 1 N/A '

Top 02/09/87 V 1 N/A i Top 09/24/86 V 1 N/A l Top 06/16/86 V 1 N/A :

Top 06/19/85 V 1 N/A I Top 01/19/85 V 1 N/A 2

Top 04/09/84 L 1 1444 !

Top 03/28/84 V 1 N/A j VI-40 Top 03/31/89 V 0 N/A I i'

(169) Top 07/24/87 V 0 N/A Top 02/09/87 V 0 N/A Top 09/24/86 V 0 N/A

Top 06/04/86 V O N/A j Top 06/IE/S5 V 0 N/A

Top 01/30/85 V 0 N/A j Top 04/19/S4 L 0 1438 j Top 03/28/84 V N/R N/A O

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Page 7 of 24 TABLE 2.1-1 (cont.) ;

CONTROL TENDONS HISTORICAL SURVE!LLANCE TsTORMATION

SUMMARY

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

i Orio. Wires) EndQ) Date Type (2) Wires (3) Load (kips)(4) f

) VM-40 Top 03/31/88 L 0 1439 1 (169) Top 07/24/87 L 0 1416

Top 02/09/87 L 0 1416 i

Top 09/25/86 L 0 1355 1

Top 06/04/86 L 0 1454 i Top 06/18/85 L 0 1437 Top 01/30/85 V 0 N/A Too 04/19/84 L 0 1433 i Top 03/28/84 V N/R N/A I I

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O 1) Indicated by PCRV buttress number. If between two buttresses, indicated by coth nearest buttress numbers. Longitudinal tendons ,

indicated by "Top" ,or "Bottom". t 1

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

V: Visual inspection of ancnor assembly only. ,

l 3) N/R: Not reported j i

3 4) N/A: N0t Applicable for a visual-only surveillance; i.e., no l i liftoif test performed. ;

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Page 8 of 24 2 1.1.2 New Tendons The new tendons selected for visual inspection for this

- sixth six-ronth interim surveillance period are as follows:

Top Bottom Circumferential Crosshead Crosshead Lonoitudinal CI 14.1 TORM1 BOLM3 VI-4 VI-18

! CM 14.1 BIRM3 VM-5 VI-19 CO 14.1 BORM4 VI-9 VM-19 CI 16.1 BOLL 4 VI-10 VI-23 CM 16.1 BILL 4 VI-12 VM-24 CO 16.1 BIRL4 VM-12 VI-25 CM 6.2 VI-13 VM-25 CI 7.2 VI-14 VI-30 CM 7.2 VM-14 VM-31 CO 7.2 V0-14 VI-35 CI B.2 VI-15 VI-42 ,

CM S.2 VI-16 VM-42 CO 8.2

A summary of the latest surveillance information gathered l during this sixth six-month interir visual-surveillance i 3

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. l The number 'o f new tendons for visual inspection of each tencon type oeterved with noneffective wires are as follows:

'wo(2) out of thirteen (13) new circumferential, zero(0) out of one(1) new top crossnead, two(2) out of six(6) new bottom !

l Crosshead anc four(4) out of twenty-four(24) new l

1 longitudinal. The actual numcer of noneffective wires '

observed in each of these tendons is given in Table 2.1-2. ;

l l Out of the total of forty-four(44) new tencons for visual :

inspection, thirty-three(33) have had at least one previous l I

surveillance on at least one end since March 1984 (the date '

of discovery of the tencon corrosion problems). Out of these 33 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 tencons.

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TABLE 2.1-2 NEW TENDOP15 LATEST SURVEILLANCE INFORMATION

SUMMARY

Tendon No. Number of

{ (Number of Tendon Surveillance Sury. Noneffective Liftoff j Orio. Wires) End(1) Date Type (2) Wires Lead (kips)(3) i CI 14.1 1 05/11/8S(4) L 1 1226 (152) III 05/23/8S(4) L 0 1205 l

) CM 14.1 I 05/10/83(4) L 0 1225 j (152) III 05/23/8S(4) L 0 1196 i

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CO 14.1 I 05/11/SS(4) L 1 1176 (152) III 05/23/SS(4) L 0 1200

.I 16.1 I 05/13/SS(4) L 0 1378 i; 1370 (169) III 05/25/8S(4) L 0 CM 16.1 I 05/13/8S(4) L 0 1378 (169) III 05/25/88(41 L 0 1362 CO 16.1 1 05/13/8S(4) L 0 10/4

! N/A

(169) III 05/25/SS(4) V 0 CM 6.2 IV , 05/05/38(4) L 0 1151 (152) VI 04/07/SS(4) L 0 1174 CI 7.2 IV 05/04/38 L 0 1206 (152) VI 04/U7/SS(4) L 0 1213 CM 7.2 IV 05/04/88 L 0 1192 (152) VI 04/07/SS(4) L 0 1170 CO 7.2 IV 04/23/88(4) L 0 1135 (152) V! 04/07/SS(4) L 0 1188 CI S.2 IV 04/27/8A;4) L 0 1240 (152) VI 04/C5/88(4) L 0 1234 CM S.2 IV 04/27/SS(4) L 0 1170 (152) VI 04/06/8S(4) L 0 1222 C0 S.2 IV 04/27/SS(4) L 0 1169 (152) VI 04/06/8S(4) L 0 1186 TORM1 III-IV 06/02/33 V 0 N/A (169) VI-I 06/15/85 V 0 N/A (continued next page)

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TABLE 2.1-2 (cont.)

NEW TENDONS LATEST SURVEILLANCE INFOKMATION

SUMMARY

Tendon No. Number of (Num.cer of Tendon Surveillance Sury. Noneffective liftoff ;

Orig. Wires) End(1) Date Type (2) Wires Load (kios)(3) ;

20LM3 III-IV 03/15/88 V 1* N/A (169) VI-I 03/13/88 V O N/A BIRM3 III-IV 03/15/83 V O N/A (169) VI-I 03/13/88 V 0 N/A ;

EORM4 III-IV 03/14/85 V 3' N/A i (169) VI-I 03/13/88 V 0 N/A l

BOLL 4 II-III 03/12/SP V O N/A !

(169) V-VI 03/13/Ed 'i 0 N/A l BILL 4 II-III 03/12/88 V 0 N/A i

(169) V-VI 03/12/SS V O N/A [

BIRL4 II-III 03/13/83 V 0 N/A 1 (169) V-VI 03/13/88 V 0 N/A 1

VI-4(169) Top 03/27/88 V 0 N/A j 2

VM-5(169) Top 03/27/85 V O N/A ,

VI-9(169) Top 03/30/88 V 0 N/A VI-10(169) Top 03/2S/SB V 5' N/A

} VI-12(169) Top 03/28/88 L 0 1401:

VM-12(169) Top 03/28/S8 V 0 N/A j l VI-13(169) Top 03/28/88 L 0 1411 ,

l i VI-14(169) Top 03/28/83 V 0 N/A :

1 VM-14(169) Top 03/28/88 V 0 N/A

{ VO-14(169) Top 03/28/85 V 4' N/A t

l VI-15(169) Top 03/29/8S V 0 N/A VI-16(169) Top 03/29/88 V 0 N/A j 3

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i TABLE 2.1-2 (cont.)

L NEW TENDONS LATESTSURVEILLANCEINF0lMATIONSUMMAR Tendon No. Number of (Number of Tendon Surveillance Sury, Noneffective Liftoff l Orio. Wiresi End(1) _, Date Typel2] Wires Lead (kios)(3) ;

VI-18(169) Top 03/29/85 V 0 N/A l VI-19(169) Top 03/29/88 V 0 N/A i

l VM-19(169) Top 03/29/88 V 0 N/A VI-23(169) Top 03/29/83 V 0 N/A 1

VM-24(169) Top 03/29/8B V 0 N/A VI-25(169) Top 03/30/85 V 0 N/A VM-25(169) Top 03/30/83 V 0 N/A l

VI-30(169) Top 03/30/S8 V 0 N/A VM-31(169) Top 03/30/28 V 0 N/A 3 VI-35(169) Top . 03/30/83 V 1* N/A l '

J VI-42(169) Top 03/31/88 V 0 N/A

, VM-42(169) Top 03/31/83 V 2* N/A i

j NOTES (by reference numbert j

1) Indicated by PCRV buttress number. If between two buttresses, l indicated by both nearest buttress numbers. Longitudinal tencons !

indicated by "Top" or "Bottom".

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

t V: Visual inspection of ancnor assembly only. [

i 3) N/A: Not apeltcable for a visual-only surveillance: 1.e., no liftoff test performed.

4) First surveillance since original installation in 1970. '

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

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s Of the eleven (11) remaining new tendons' for visusi inspection with no previous surveillance record on either end, all of which are circumferential tendons, two(2) were observed with noneffective wire (s): Tendons CI 14.1 and CO 14.1, each with one(1) noneffective wire on one end only.

These noneffective wire numbers are well within the surveillance results of noneffective wires found previously in other circumferential tendons. ,

The new-tendon observations during the sixth six-month interim surveillance program peried continue to demonstrate

, that PCRV. tendon corrosion is randem in nature among the tendons of each tendon tyoe. The observations of the latest l new-tendon g*oup 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 Tencens ,

The control tendon group for liftoff testing is that group p )f tendons which, once selected, remains constant ir

, idercity and cuantity curing each six-month period of the interim surveillance program. The tendons cnosen as control i tercons for liftoff testing, included in the ontrol group <

for visual inspection, were selected during the first six-i mnnth interim surveillance period and initially presented in

! the January 1986 report. These liftoff control tencons are

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as follows:

Top Bottom ,

Circumferential Crossnead Crosshead Lenoitudinal ;

t a CM 1.1 TIRM2 BIRM4 VM-10 l

. CO 14.4 (load cell) VI-20 i CM 16.3 VM-40 The most recent and historical measured liftoff loads for each of these liftoff control tencons is presented in Table l 2.1-1. The loac cell reading during the most recent liftoff '

on Tendon BIRM4 was 1266 kips, which compares favorably with five previous readings of 1291, 1250, 1253, 1264 and 1257 kips, i

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Page 13 of 24 The tendon liftoff loads measured to date for the control tendons, in all cases, continue to be well above the minimum t

design loads for each tendon type as reported earlier in Letter P-84135, dated May 7, 19F4. 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 within an acceptable and expected range of 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 and liftoff tested during each eighteen (18)-month program

! period. The new tendons selected for liftoff testing may be

! included in any of the new tendon groups stlected for six-l month visual inspections during the 15-month period.

Liftoff surveillance findings on the new tendons selected for liftof f testing for the first 18-month period, covering July 21, 1985, to January 21, 1987, were reported ahead of the committed schedule in the tendon surveillance report submitted under Letter P-86463, dated July 18, 1986.

Liftoff surveillance findings on the new tendons selected for liftoff testing for the second 18-menth period, covering January 21, 1987 to July 21, 1988, were also renorted ahead i of the commit,ted schedule in the tendon surveillan:e report submitted under Letter P-88002, dated January 8, 1988.

Under the current orogram, the new tendons for liftoff testing for the third 18-month interim surveillance period, ,

covering July 21, 1988, to January 21, 1990, will be selected at a later date, with the report of the liftoff surveillance findings due January 21, 1990. ;

2.2 WORST-CASE TENDON SVRVEILLANCES 4

As indicated in Section 1.0, this report also covers the findings of the fourth semiannual visual inspections perforned on the tendons from the worst-case tendon group.

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

I Worst-Case Tendons CO 2.5 CM 4.6 BILV3 t BILV4 VM-30 i

Page 14 of 24 O

O A historical surveillance information summary including the findings during this latest (fourth) 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 previous three surveillance reports for the first, second and third semiannual worst-case tendon surveillance periods. Furthermore, there has been no increase in noneffective wires in the worst-case tendons for a period of at least three years (except for Teridon CM 4.6, first surveilled in March 1986) which continues to demonstrate that the corrosion rate 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 Tencon CM 4.6 was presented in the surveillance report dated July 1987 (P-87234). As indicated in that , report, a fluorescent dye was investigated for its use in the System 46 PCRV liner cooling water system as a means of determining whether O System 46 water is the source of water buildup in Tendon CM 4.6. As a result, a red fluorescent dye was added to tne System 46 water on September 3, 1937.

A visual surv'eillance of Tendon CM 4.6 was perforced on July 23, 1988. As snown 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-month accumulation is the same as the previous six-month accumulation as reported in the last (January 1988) surveillance report.

An analysis of the latest water sample from the tendon shows no conclusive trace of the fluorescent dye added to System 46.

The use of this particular red fluorescent dye will be discontinued because its detection separate from other color wavelengths in the tendon water sample is uncertain (d.'e to a "masking" effect) and it takes considerable man-hours to prepare the dye for injection and requires injection approximately weekly. A search has begun for a different, hopefully more effective, tracer ingredient for addition to System 46 cooling water requiring less preparation time.

O

Page 15 of 24

)

TABLE 2.2-1 WORST-CASE TENDONS HISTORICAL SURVEILLANCE INFORI TION

SUMMARY

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

CO 2.5 I 03/11/88 V 16 N/A (169) 1 09/30/87 V 16 N/A I 05/26/87 V 16 N/A 1 1 I 11/14/86 V 16 N/A

I 07/22/86 V 16 N/A I 06/14/84 L 3 1295 I

V 03/11/88 V 2 N/A V 09/30/87 V 2 N/A i V 05/26/87 V 2 N/A V 11/14/56 V 2 N/A V 07/22/86 V 2 N/A V 06/14/84 L 0 1327 CM 4.6 II 07/23/88 V 20 N/A fs (169) II 11/24/87 V 20 N/A l

Q II 11 05/27/87 11/14/86 V

V 20 20 N/A N/A

II 06/20/86 V 20 N/A '

II , 04/08/86 L 20 1235 1

IV 07/23/88 V 0 N/A IV 11/24/87 V 0 N/A

IV 05/27/87 Y 0 N/A IV 11/15/86 V 0 N/A IV 06/20/86 V 0 N/A IV 04/03/86 V O N/A

BILU3 I-II 03/16/88 V 18 N/A .

(169) I-II 11/06/87 V 18 N/A I-II 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 I O (continued next page)

Page 16 of 24 TABLE 2.2-1 (cont.)

WORST-CASE TENDONS l HISTORICAL SURVEILLANCE INF6 MATION

SUMMARY

l Tenden No. Number of ,

D (Number of Tendon Surveillance Sury. Noneffective Liftoff ;

} Orio. Wires) End(1) Date Type (2) Wires (3) Lead (kips)(4) ,

l BILU3 (cont.) IV-v 03/15/88 V 20 N/A (169) 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 :

IV-V 05/16/S6 L 20 1249 '

IV-V 03/16/85 V 20 N/A i

IV-V 08/14/84 L 12 1223 I IV-V 04/13/84 L 8 1228

BILU4 I-II 03/16/88 V 28 N/A 1

(169) 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 05/15/84 L 17 1150 ;

I-II 04/01/84 V 17 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 i 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 ,

t VM-30 Top 03/30/88 V 22 N/A (169) Top 07/22/87 V 22 N/A j Top 02/11/87 V 22 N/A i i Top 09/25/86 V 22 N/A !

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

t l

i l

l J I (continued next page) 7 I

l

--- _ - - - - _ - - - - - - - - - - - - - - - - - - - - - x

Page 17 of 24 TABLE 2.2-1 (cont.)

(}

WORST-CASE TENDONS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

1 NOTES:

1) Indicated by PCRV buttress number. If between two buttresses, ,

indicated by both nearest buttress numbers. Longitudinal tendons i

] indicated by "Top" or "Bottom". !

2) L- Liftoff and visual inspection of anchor assembly and wire bundle, t

, V: Visual inspection of anenor assembly only.

3) N/R: Not reported -

s

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

. liftoff test performed.

i F

1 i

i I

t I

l i

)

l l

t

(

Page 18 of 24 It therefore cannot be concluded at this time whether or not System 46 is the source of the water drained from the tendon tube. It is still believed, as reported earlier, highly unlikely that System 46 is the source and that, more likely,

the source is evaporation and recondensation of water from low spots within the horizontal tendon tube itself.

As evidenced by a liftoff test in April 1986 Ter. don CM 4.6 J is carrying effective DCRV prestress load and remains an j effective member of the tendon system.

2 2.3 SUPPLEMENTAL TENDON SURVEILLANCES One(1) additional tendon over and above the control, new and I worst-case tendon groups was surveilled during the past six-month period. This tendon, BORL4 (bottom crosshead), was i subjected to a visual surveillance on both ends. No }

increase in noneffective wires was observed over previous i surveillances. (Note: Previous surveillance indicated l one(1) noneffective wire in one end only.)

1 2.4 COLLECTIVE TENDON SURVEILLANCE INFORMATION SUMMARIES 1 2.4.1 Tendons with Noneffective Wires l Table 2.4-1 provides a complete summary of all tendon ends i surveilled through July 23, 1988 (the effective surveillance cutoff date for this report), which have been observed with noneffective wires, and tne number of reneffective wires in each. Table 2.4-1 in this report is an update of Table 2.4-

, I from the January 1983 report (P-SS002). .

Since the January 1988 report, two(2) additional tendons .

have been observed witn none'fective wire (s): Tendons CI l

14.1 and CO 14.1, each with one(1) noneffective wire on one '

< end. Neither of tnese two tendons had a documented surveillance prior to the January 1988 report since original installation in 1970. '

) Sixteen (16) tendons previously surveilled with noneffective i

wires prior to the January 1933 report were resurveilled within the past six months; of these sixteen tendons, none were observed with an increase in the number of noneffective j wires.

I I

i :

i l

i u___-_-__ - ___ ~ - - +

Page 19 cf 24

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1 Page 21 of 24 I
i O To date, 370 of the total 448 PCRV tendons have been surveilled on at least one end since March 1, 1984 Of i these 370 tendons surveilled, a total of sixty-three(63) :
tendons, or 17.0 percent, have been observed with one or more noneffective wires each. These 63 tendons include fifty-eight(58) tendons with seven(7) or fewer noneffective ,
wires each and only five(5) tendons with sixteen (16) or more j noneffective wires each (these are the five worst-case
tendons of Section 2.2 of this report). l 3 t
! 2.4.2 Tendon Surveillance Historical Information The PCRV Tendon Surveillance Plan Pawings, showing '
graphical end views, with specific historical surveillance j information, of all CCRV tendon ends, have been updated to j include all t<ndon surveillances through July 23, 1988.
These updated drawings, Numoers IA through 10, are included in Appendix A of this report. Reference the key on the i I
crawings for an explanation of the information provided for each tendon end.
I
! 2.4.3 Number and Percentage of Tendens Surveilled To Date 1
l Table 2.4-2 provides a complete summary of the number and !
I percentage of tenoons of each type which have had a given !
comsination of liftoff and/or visual surveillances performed '
on them at least one time between March 1, 1934 (the 4
aporeximate start date of increased tendon surveillances),
1 and July 23, J958 (the effective surveillance cutoff date l for this report). Table 2.4-2 is a revised update of Table ,
4 2,4-2 of the January 1983 tendon surveillance report i 1 (P-85002). l l l i For the table count, no tendon has been counted more than l
, ence. All possible end ccebinations of surveillance types, i 1 including no surveillance, for any tendon are categorically !
] tabularizec. Tnerefore, the total sum of surveillances (and j no surveillances) shown for cach tendon type (each column) ;
! equals the total nuroer of tendons of that type in the PCRV. !
i As observed in Table 2.4-2, 370 of the total 448 PCRV {i tendons, or 82.6 percent, have had at least a visual i inspection on at least one end at least one ilme since March (
! 1, 1984. This is an increase-of 3.1 7 ercent in total '
tencons surveilled since the last (January 1938) tendon ;
surveillance report.
] ;
i i
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Page 22 of 24 a
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. w w
.E
.. ;!E - gJ g
- .. - . p. . 6 1
4 !
- , - i .. ,
19 i !4 t 4
4 e i
, 3a wg g
=
I u g f
-# w i ii .4 I
l *81 lw 4e u - e g ,x m ]
1
! O<
lh .C. '6 .C
l. 3 10 16 e i
' .C. i. i i C.
4.C
, y
.g
.* w w
- y =
g w
% ;- th -
iw , i. g g ee .
I E t lg <
i.s. ,i - ig 'g t
Ig i '
ei - c . =
O d a i i i .
r.e -
' .* C C C d*
, ..3l C I IC !l 13 ,}
tC $, { C $. 6 C -. . {C i C 44 g f9
(.
u 4 w L rg <l<O ta to 2 44 '.2 44 2.
tt
12. . 't.t. - J
44. 2. .t.t 2 '44 i
g g w 4 C
. w .
g 1 3
.a 0 ..- * . l t , 6
& Cg g+= .,,g V 64
=. Gw p j
v II l ix -
f 3 l
p-1 i
i y {'
i
! y d
m g
si IC
. C l
l L .
. it' , *C C d w .
d O I l ( I C = b C j r. id l ,
i 6. l' 3 v w e 9,
v. [
l+ l 6 p b tg OC = .C. - L e j
= -
4 i
\ -
g I.
g I
sw w (' .J
- c. -
5
. m- C C 1 a a l 1
w I .. -w g w - t Id l I l C l C I% i .. t. ab u = C U se
'o t J'4
}
I ig i l 3 <
t t 6 i =. g Ce > s e a -
4 6 ; i . .
iy. . y l . I er g d
.f. (? Q g I yw 'y w =
l g a d * %
i]k ! d I
i 6-i
' w& l r. lE C I a4
.5 1..3 , -
t g
>C C -
4 4 C A d e f j
- f i w ;; , e t tC g :e .I d g a c .t.
i. ! . .
'1.( ,9 i= i g %. j .s [ g Ls a n y C .
.I & ie . 1 ."
lg J.+ ! ts . .> g yx . .= 4 ;
[
'.. 1v 3 i&- ,- {G- *w &r . . a w & 4 W W l2 i
. .g.
u - u 5 -g * . ,
w iw j
g. tg 6
.. l .; i L g . -x s. w j g !g ) .r .x <1, r, 3 9 >.
-. 1x4-w
. . t, i
5 d . g , Ii .
I l1. ; C ,
IC 45=C
'C-iC=
.- r. -
. = -
C C
-C 2
r. 4 L, -
C C
6 3 ..
i
- .- . 3 i
- t, A '
.C. l) w% - 3C - Iy --C 9 C i
i C 40m iC* 69 +4* . . ! wd a
w w t.w wt 1.* > lC > i.3.>. -
t x - 3 . .
i .n 1 8 - . t e.
- ., dC i .t i .s 1 4 .r.
. => * ( s ry' en i i
J {C t. - .
,C I. -.C. *= 1C . -g . % [ ta =
4 .=
> '- .2. '.>. '.). 2. .>.2 2 g
e g' g C
4, a g
> E a .C,,
=
f, 54 he,
{
enz> -<avw ->6- i -
l- . .. - - -
1 c -
g m
r,
- - - ~
m g c g ~.
p g 7 i
i i I h
l .
i i
Page 23 of 24 i
The remaining accessible ter< dons not surveilled to date, all
< of which are circumferential tendons, will be included in the groups of new tendons for subsequent surveillance cariods until all accessible PCRV tendons have been turveilled. The prooosed revised surveillance schedule, as outlined in Letter P-87234, would accelerate completion of surveillance of all remaining accessible tendons without a
surveillance to date.
4 I
A 4
e i
1
]
l 4
d i 1
i 1
I i 1
i l
1 i l '
i 1
!O 0
l 1
Page 24 of 24 l
l I
)
l APPENDIX A l PCRV TENDON SURVEILLANCE !
PLAN DRAWINGS l
1 Orawieg Number Tendon Type 1A Longitudinal i l
1B Circumferential 1 Layers 2, 5 and 4 !
1C Circumferential Layers 1, 6 and 3 I J l 10 Top Crosshead Bottom Crossnead
l 1
i s .. .
._a,a.m----A-,eL.-.mm amms-wasm--Aa,ma-s_-m,aam. s - ux. --m_nmam_.- -am.um,- __m-.,,,w- m -
r OVERSIZE DOCUMENT PAGE PULLED i
i l SEE APERTURE CARDS
_ ..R.,_.,z._.,_..._,_. e l
l i
, APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH j FT5 492-8989 I .
- ,- _ , _ - _ ~ _ -- _ ------_----

ML20154E098

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ML20154E098

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