ML20212K126

Prestressed Concrete Reactor Vessel Tendon Interim Surveillance Rept. W/Four Oversize Drawings

ML20212K126
Person / Time
Site:	Fort Saint Vrain
Issue date:	01/31/1987
From:	PUBLIC SERVICE CO. OF COLORADO
To:
Shared Package
ML20212K102	List: ML20212K098 ML20212K126 ML20265F730 ML20265F741 ML20265F746 ML20265F751
References
NUDOCS 8701280520
Download: ML20212K126 (28)

Text

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PCRV TENDON INTERIM SURVEILLANCE-REPORT January, 1987 l Fort St. Vrain Nuclear Generating Station j Public Service Company of Colorado i

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l l@ B701290520 870119 PDR ADOCK 05000267 P PDR

ABSTRACT

(

V' This report is the third consecutive semiannual report to be submitted under the requirements of the interim surveillance program set up 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 first semiannual visual surveillances on the newly-established worst-case tendon group are reported.

The major findings, facts and conclusions reported herein include the following:

o The rate of corrosion in the control tendons remains at a level of no immediate concern and is quite possibly only infinitesimal in nature.

o 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. ,

o Based upon the lack of an increase in non effective wires, there is no indication that corrosion is continuing in any of the 32 previously-surveilled "new" tendons, o Existing PCRV tendon corrosion continues to be random in nature among the tendons of each tendon type, o Based on the latest available liftoff loads, each of the worst-case tendons continues to provide effective prestress for the PCRV.

o It appears that there is no constant influx of water into the tendon tube of the special case Tendon CM 4.6.

o 334 of the total 448 PCRV tendons, or 74.6 percent, have had at least a visual inspection on at least one end at least one time since March 1, 1984.

o Of the 334 tendons surveilled since March 1, 1984, a total of 55, or 16.5 percent, have been observed with non-effective wires.

These 55 tendons include 50 tendons with only 7 or less non-effective wires each and only 5 tendons with at least 16 non-effective wires each, o Of the 298 total tendons liftoff tested on at least one end since March 1, 1984, representing 66.5 percent of all 448 PCRV tendons, all possess load significantly above the minimum required load for each tendon type.

l o Of the 334 total tendons surveilled (visual or liftoff) since l

March 1, 1984, which represents 74.6 percent of all 448 PCRV t

tendons, no tendon (including the 5 worst-case tendons) possesses a number of non-effective wires above the maximum allowable

(~')/

s-- number which would trigger a specific engineering evaluation.

Moreover, except for 1 tendon, the number of non-effective wires for each worst-case tendon has remained constant for a period of at least 21 months.

o Based upon the lack of any increase in non-effective wires, t

evidence strongly suggests that corrosion is not continuing at any significant rate, if at all, in a very high percentage (probably 97 percent or better) of the PCRV tencons.

I i o From monthly tendon load cell data, there continue to be no signs in any of the load-cell tendons of a general trend toward load relaxation or load loss, o It can be safely stated that there is a very high probability that every PCRV tendon will maintain viability, i.e., the capability of continuing effectiveness to carry load above the minimum required load, for at least several more years and possibly quite longer.

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CONTENTS

1.0 INTRODUCTION

. . . . . . . . . . . . . . . . . . . . . . . . . . 1 2.0 PCRV TENDON SURVEILLANCE INFORMATION. . . . . . . . . . . . . . 1 l

2.1 FINDINGS OF THE THIRD SIX-MONTH INTERIM SURVEILLANCE PROGRAM PERIOD. . . . . . . . . . . . 1 1

2.1.1 Visual Inspection . . . . . . . . . . . . . . . . . 1 1

2.1.1.1 Control Tendons. . . . . . . . . . . . . . 1 i

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2.1.1.2 New Tendons. . . . . . . . . . . . . . . . 2 l 2.1.2 Li f to f f Te s ti ng . . . . . . . . . . . . . . . . . 11 2.1.2.1 Control Tendons. . . . . . . . . . . . . 11 2.1.2.2 New Tendons. . . . . . . . . . . . . . . 11 i

l 2.2 WORST-CASE TENCON SURVEILLANCES. . . . . . . . . . . . . 11 i

l l 2.3 SUPPLEMENTAL TENDON SURVEILLANCES. . . . . . . . . . . . 15 2.4 COLLECTIVE TENDON SURVEILLANCE l

INFORMATION SUMMARIES. . . . . . . . . . . . . . . . . . 16 i

2.4.1 Tendons with Non-Effective Wires. . . . . . . . . 16 2.4.2 Tendon Surveillance Historical Information. . . . 20 I 2.4.3 Humber and Percentage of Tendons Surveilled to Date. . . . . . . . . . . . . . . . 20 2.4.4 Conclusions . . . . . . . . . . . . . . . . . . . 20

2.5 TENDON LOAD CELL SURVEILLANCE. . . . . . . . . . . . . . 22 l APPENDIX A

PCRV TENDON SURVEILLANCE PLAN ORAWINGS. . . . . . . . 24 i

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Page I cf 24 l

1.0 INTRODUCTION

I 1:

D This is being submitted to comply with the (V report requirements of the interim surveillance program which has been sat up to monitor corrosion in the Prestressed Concrete  :

Reactor Vessel (PCRV) prestressing tendons (

Reference:

P-85071, dated March 5, 1985). This is the third consecutive semiannual report to be submitted under this program; the first six-month report was submitted under Letter P-86042, dated January 22, 1986, and the second semiannual report was submitted under Letter P-86463, dated July 18, 1986. 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 during each six-month interval to be reported at the end of each period.

The present report therefore reports the findings of tendon surveillances performed since the July,1986, report; more specifically, the actual tendon surveillances covered under this report were performed during the period June 21, 1986, ,

through November 30, 1986.

i In addition to the control and new tendon groups as part of the interim surveillance program, this report also covers 2 the findings of the first semiannual visual surveillances

! performed on the five(5) " worst-case" tendons as proposed by Public Service Company of Colorado (PSC) in Letter P-86491 O Attachment, Pages 10 and 11 of 13, in response to NRC Question II.1 as submitted to PSC in a letter from C. S.

l Hinson to R. F. Walker, Jated June 12,1986(G-86314).

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

PERIOD l The PCRV tendon interim surveillance program scope, definitions and requirements were reviewed in detail in .

Section 2.1 of the January,1986, report (P-86042). The findings of the surveillances performed during the third six-month interim surveillance period are reported here.

For ease of comparison and cohesiveness from report to i report, the tabular, graphical, text and organizational i format of findings will continue to appear in the same manner in this report as in the January and July, 1986, reports, j 2.1.1 Visual Inspection 1

2.1.1.1 Control Tendons i

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

[

r Paga 2 cf 24 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 complete historical surveillance information summary, including the findings during this third six-month interim surveillance period, of each end of each control tendon is presented in Table 2.1-1.

The general observation and discussion of findings relative to the control tendons as reported in Section 2.2.1.1 of the January, 1986, report (P-86042) remains applicable. Based on the line of reasoning from this discussion and referring to the findings reported in Table 2.1-1, it is again noted that no new non-effective wires have been observed in any of the control tendons during this latest (third) semiannual surveillance period as compared with previous surveillances.

In fact, no new non-effective wires have been observed in any of the twelve (12) control tendons since the interim program surveillances began in June, 1985.

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It is therefore concluded that, to date, the rate of

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corrosion in the control tendons remains at a level of no immediate concern and is quite possibly only infinitesimal in nature.

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

Top Bottom Circumferential Crosshead Crosshead Longitudinal CI 5.1 TORL2 OILU4 VI-3 VM-19 CM 5.1 BORU4 VI-4 VI-23 C0 5.1 BOLL 4 VI-5 VM-24

, CI 6.1 BILL 4 VM-5 VM-25 l CM 6.1 BIRL4 VI-12 VM-26 CO 6.1 BORL4 VM-12 VM-27 CO 1.2 VI-14 VI-31 CO 2.2 VM-15 VM-32 CM 3.2 VI-16 VM-33 C0 3.2 VI-18 VM-34 CI 4.2 VM-18 VM-35 CM 4.2 VI-19 VM-41 l /~'N CO 4.2 N] --

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a 1 Page 1 or as TABLE 2.1-1 COctiROL TfIs004S HISTORICAL SURVEILtAseCE IIIIORMAT 4Oel SupetARY Tendora no. Number of (plumber of Tendon Sury. Sury. Ston-[ f fec t ive Liftoff crieu wiresj Endijj page Type (21 wiresf31 toad Ikipsl Corrosion Conditionf 41/ Remarks CM 1.1 8 11/04/86 L 0 1350 Disc. on washer. 360 disc. on wires.

(169) 8 06/12/86 L 0 1371 Di sc. On wa she r. 800 disc. on wi res, t 10/15/85 L 0 1392 No disc. found on washer or wires.

Mold found on wires.

I 10/02/84 L 0 1315 Lack of grease present. Rust visible throughout wire bundle.

III 10/29/86 L o 1318 Disc. on washer. Sto disc. on wi res.

888 06/11/86 L 0 3314 Disc. on washer, eso d i sc. on wi res.

III 10/17/85 L 0 1327 No disc. found on washer or wires.

488 10/02/84 L 0 1275 Very little grease present. Rust y visible throughout wire bundle.

CD 14.4 88 10/29/86 L 0 1218 Disc on washer. No disc. On wires.

(152) II 06/07/86 L 0 1275 Disc. on washer. 800 disc. on wires.

( II 12/20/85 L 0 1237 No disc. on washer or wires. Wi res l g rea sy.

l 8I 10/17/84 L 0 1180 Some grease present. Rust present throughout wire bundle.

l VI 10/24/86 L 0 1167 Disc. on washer. 860 disc. on wi res.

VI 06/09/86 L 0 1208 Disc. on washer. No disc. on wi res.

V8 12/19/85 L 0 1196 No disc. On washer. 100 oxid, on wires.

V8 10/17/84 L 0 1150 Lack of grease present. Rust visible throughout wi re area.

l CM 16.3 III 09/29/86 L 0 1310 Disc on washer. 86o disc. on wi res.

(169) 888 06/07/86 L 0 1387 D i sc. on wa she r. 80 0 disc. on wires.

III 12/13/85 L 0 1380 leo disc. on washer or wires. Wi res clean and greasy. .

III 03/25/85 L 0 1352 peo rust on washer or wires. Medium grease '

on wi res.

V 10/16/86 L 0 1299 D i sc. On wa she r. leo disc. On wi res. N V 06/11/86 L 0 1372 Disc. on washer. 800 disc. on wi res. er V 12/16/85 L 0 1373 No d i sc. on wa she r. Oxid. On both sides or wire bundle.

V 03/26/85 L 0 1368 feo rust on washer. Rust and medium grease 8**

. on both sides wire bundle. o 1IRM2 8II-IV 10/24/86 L 0 1359 Di sc. on wa she r. Iso disc. on wires, m (169) til-IV 05/21/86 L 0 1392 peo disc. on washer. Oxid. on some wi res. a lit-IV 12/18/85 L 0 1377 Ito disc. On washer or wires.

III-IV 02/05/85 L 0 1364 Iso visible rust on washer or wires. Oxid.

on shies inside surface.

VI-I 10/21/86 L 0 1281 Di sc On wa she r. 300 disc. On wi res.

VI-8 05/20/86 L 0 1391 Di sc. on wa she r. Oxid. on some wires.

VI-1 12/17/85 L 0 1380 800 disc on washer or wires. Wi res greasy.

(continued next page)

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H $TORICAL SURVEILLAfgCE INFOftetATIOff SuestARY lendon No. Number or (soumber or Tendon surv. Sury. soon-Errective Liftorr Oreg. wirest T_ndW _Da ge_ typef?) wirest31 toad Ik ioM Corrosion Conditionf 41/ftemerks 1sFfe (cont.) VI-t 02/13/85 L 0 1370 80 0 rust on washer. . Rust and scale on (169) shies. Rust, scale and pitting on wires, B:Rees sa -sV 10/31/86 L 0 1363 Disc. on washer. sto disc. on wires.

(169) II8-IV G4/18/86 L 0 1395 Di sc. On wa she r. Ito disc. On wi res.

5II-IV 12/30/85 L 0 1372 Iso disc. On washer or wires.

tit-8V 03/85 V O - Itot reported.

188-IV 09/11/84 L N/R 1291 Bio rust round on wires. Wi res need g rea se.

8It-tv b4/01/84 V N/R -

Brg, plate and shims rusted.

(toad Cet4) VI-I 11/05/86 L 0 1306 Disc. on washer. Disc. on wires.

Load cell littorr value: 1253 F.ips.

Va-8 04/29/86 L 0 1364 Disc. on washer. Ito disc. on wires.

Load cell Iirtorr value: 1264 kips.

VI-I 11/27/85 L 0 1344 880 disc. On washer or wires. Load cell littorr value: 1257 kips.

VI-I 03/85 V O -

Isot repo rted.

V8-8 09/11/84 L N/R 1307 Rust present in wire bundle. Lack of g rease present.

V8-8 04/01/84 V N/R -

Srg, plate corroded.

VI-I 12/71 V 88/R -

Corroded.

DILM3 8II-IV 10/31/86 V O -

D i sc. on wa she r.

(169) 8I8-BV 04/18/86 L 0 1388 Disc. on washer. 80 0 disc. On wi res.

ItI-8V 01/03/86 L 0 1352 Ito disc. On washer or wi res.

8II-IV 03/85 V O -

Isot reported.

III-IV 09/12/84 L 0 1287 feald and rust present in wire bundle.

Lack or grease present.

III-IV 04/01/84~ V N/R -

Brg, plate rusted.

VI-I 11/07/86 V 1 -

Disc. on washer. N l V8-t Vl-8 04/30/86 12/03/85 L 1 1319 1298 Disc. on washer. 80 0 disc on wires. g I

l L 1 300 4 i sc. On weshe r or wI res. Greasy. e VI-B 03/85 V 1 -

Ilot reported.

V8-8 09/12/84 L 1 1279 Rust on tendon tube. Wires well greases. * ,

I V8-t 04/01/84 V 18/R -

Brg. plate and shies corroded. O

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%91- 1 0 Top 09/25/86 L 7 1305 Disc. on wesher. Ito disc. on wires. m i (169) Iop 05/24/86 L 7 1413 Disc. on washer. Ito d i sc. On wi res. * '

Top 06/20/85 L 7 1388 Disc. on brg. plate. Ito disc. On washer.

Lc::alized oxid, in wire bundle.

Top 01/17/85 V 7 -

100 d i sc.

Top 04/09/84 L 3 1344 960t repo rted.

Top 03/28/84 V 3 -

Condensation in cover.

(continued next page)

s.s-Page 3 of 4 TABtt 2.1-1 (cont.)

N[W TINQCNS HISTORICAL SURVEltLANCE INf0RMATIOP6

SUMMARY

Tencon No. Nteber or (Nuater or Tendon Sury. Sury. Non-[ffective Liftoff OrJL ws res) (pd[1] Dale _ J.ype[2] hires (3) toad Ikipsl C_o rros ion Cond i t ion t 41/Rema rks V8-?O fop 09/25/86 1 0 1391 Disc. on washer. No disc. on wi res.

(169) Top 05/24/86 L O 1459 Ox id. on wa she r. No disc. on wi res.

Top 06/21/85 L o 1437 Wa she r, shios, brg. plate and accessible wires in good condition.

Top 01/30/85 V O - Not reported.

Iop 024/ I T/84 L o 1443 Corrosion in interior of wire bundle.

Top 03/2T/84 V N/R -

ho disc.

VM-?O lop 09/24/86 Y O -

Disc. on washer.

(169) Top U$/24/86 V O -

Disc. on washer.

Top 96/21/85 V O -

Di sc. on brg. plate.

Iop 01/30/85 V - 0 -

Not repo rted .

Top 04/17/84 L 0 1449 Corrosion in interior or wire bundle.

Iop 03/21/84 V N/R - Dry spots.

VM-3T lop 09/24/86 V 1 -

Disc. on washer.

(169) Top 09/24/86 V 1 -

D i sc. on wa she r.

Top '06/16/86 V i -

D i sc. on wa she r.

Top 06/19/85 V 1 -

Scaling shims and brg. plate.

One ra ised btnhd. bent over.

Top 01/19/85 V 1 -

No disc.

Top 04/09/84 L 1 1444 Corrosion on interior or wire bundle.

Tcp 03/28/84 V 1 -

Water in cover.

VI-40 lop 09/24/86 V O -

Di sc. on wa she r.

(169) Top 06/04/86 V O -

Disc. on washer.

Top 06/18/85 V O -

No disc.

Top 01/30/85 V O -

Not reported.

Top 04s/19/84 L O 4438 Corrosion in core or wire bundle.

Top 03/28/84 V N/R -

Water in cover.

VM-40 Top 09/25/86 L 0 1355 Disc. on washer. No disc. on wires.

(169) Top D6/G4/86 L O 1454 Top 06/18/85 L O 1437 Disc. on washer. Oxid. on one wire.

Localized oxid, on wires in interior or 7 en bundle. No d i sc. on wa she r, 89 Top 01/30/85 V O - Not reported. ,

Top 04/19/84 L 0 1433 Localized corrosion in core of wire bundle.

Top 03/28/84 V N/R -

Water in cover. Q (continued next page) g

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NJ N Page 4 or 4 TABLE 2.1-1 (cont.1 COMTPOL_i!MDONS l HISTORICAL SURVI ttANC[ INtOPMATION

SUMMARY

l h01Slby reference niemb Je:

1) Irdicated by PCRV besttress number. I f betwers two buttresses, irdicated by both nearest buttress numbers.

Longatudenal tendons irdicated by "Icp" or " Bottom".

2) L: L i f to f f ard vi sua l inspection of anchor assembly and wire bundle.

V: V e sana s enspect eon of anchor assemb 6y only.

3) N/R. r.o t re ported

4) Disc.: Cescoloration - Signifies ttic presence of any coloration which may have been caused by incipient corrosion.

Scag.: Scaling - Indicates the presence or rust-like deposits which tightly adhere to the surface.

Onsd.: Ovidation - Indscates time presence of rust-like deposits w*sich are heavy enough to indicate that they could flabe of f tre surface.

T 40 8

01 O

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Page 7 of 24 A summary of the latest surveillance information gathered ,

g during this third six-month interim visual-surveillance g 1 period for each end of each new tendon is presented in Table i V 2.1-2. Those tendon ends receiving their first surveillance '

since original installation in 1970 are noted in the table.

The majority of the new tendons were observed with only a discoloration of the anchorhead (washer); oxidation was noted on one or more wires on seven(7) of the fifteen (15) new tendons with a liftoff test.

The number of new tendons for visual inspection of each tendon type observed with non-effective wires are as l follows: circumferential: four(4) out of thirteen (13) new circumferential; top crosshead: one(1) out of one(1);

bottom crosshead: three(3) out of six(6); and longitudinal:

zero(0) out of twenty-four(24). The actual number of non-effective 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-two(32) have had at least one previous surveillance on at least one end since original installation. Based upon non-effective wires, there is no indication that corrosion is continuing in any of these thirty-two(32) previously-surveilled new tendons (this historical surveillance information is on file).

Of the twelve (12) remaining new tendons for visual inspection with no previous surveillance record on either l end, all of which are circumferential tendons, four(4) were l

observed with non-effective wire (s): Tendons CI 5.1, CM 6.1 l and CO 4.2, each with one(1) non-effective wire on one end, I and Tendon CO 1.2 with five(5) non-effective wires on one l end and one(1) on the other end. These non-effective wire '

numbers are not out of line with non-effective wire numbers found previously in other circumferential tendons.

The new-tendon observaticas during the third six-month interim surveillance progran period continue to demonstrate that the PCRV tendon corresion problem is random in nature  !

anong the tendons of each tendon type. The observations of I the latest new-tendon group also continue to show that the circumferential tendons have been subjected to some corrosion, but not to the degree of severity observed previously for the bottom crosshead and longitudinal tendons.

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\vl Page 1 of 3 TAatr 2.1-2 NEW 1_f_II.D0ms t ATIST SuetVEt ttAlgCE S m6 0RMAf t0II SusetAltY Tendon No. stumber or (her or tendon Sury. Serv. non-Effective Liftoff Orig. warest [ndLD DJe e_ I J pe(2) Wires toad lltiost Corrosion Cooditiont 31/ftomarks CI 5.1 8 08/12/86(4). L 0 1184 Disc. on washer. 800 disc. on wires.

(152) II8 08/15/86(4) L 1 1175 Di sc. on wa she r. 800 disc. on wi res.

Ot 5.1 8 08/12/86(4) L 0 1085 Disc. On washer. Ito disc. on wires.

(1523 888 08/15/86(4) t_ 0 1119 Disc. On washer. No d i sc. On wi re s.

CD 5.1 8 08/12/86(4) L 0 1164 Di sc. on wa ste r. 800 disc. On wires.

(1523 III 08/15/86(4) L 0 1167 Disc. o s waster. 0=id on 4 wires.

Cs 6.1 3 08/14/86(4) L 0 1171 Disc. on washer. Sto disc. On wires.

(152) 888 08/15/86(4) L 0 1175 Disc. On washer. Oxid, on 10 wires.

Of 6.1 3 08/14/86(4) L 0 1094 Disc. On washer. 100 d i sc. on wi re s.

(152) III 08/15/86(4) L 1 1138 Disc. on washer. Oxid, on 1 wire.

CD 6.1 I u8/14/86(4) L 0 1126 Disc. on vaster. Ito disc. On wi res.

(152) III 08/15/86(4) V O -

Disc. on washer.

CD 1.2 8V 09/20/86(4) L 5 1293 Disc. on washer. Oxid. on severa I wi res.

(169) VI 09/10/86(4) L 1 1314 Disc. on washer. Oxid on 6 wires.

CD 2.2 8V 09/19/86 V O -

Disc. on washer.

(169) VI 08/28/86(4) L 0 1242 Disc. on washer. 800 disc. on wires.

Of 3.2 IV 09/16/86(4) V O -

Disc. on washer.

(169) VI 08/20/86(4) L 0 1313 Di sc. on wa she r. Oxid, on 5 wires.

CD 3.2 av 09/16/86(4) L 0 1381 Di sc. on wa she r. Ito d i sc. on wi re s.

(169) Load ceII liftoff value: 1412 kips, (load celi) VI 08/20/86(4) L 0 1326 Di sc. On wa she r. Ito disc. on wi res.

N C8 4.2 IV 09/15/86(4) L 0 1193 Disc. on washer. Ito disc. On wi res. *

(169) ~VI 08/21/86(4) L 0 1239 Disc. on washer. 800 disc. on wires. I CM 4.2 av 09/15/86(4) L 0 1187 Disc. On washer. 800 disc. on wires. 88 (1693 VI 08/20/86(4) L 0 1191 Disc. on washer. Oxid. on 2 wires. o CD 4.2 av 09/15/86(4) L 0 1185 Disc. On washer. 300 disc. On wires, (169) m VI 08/20/86(4) L 1 1230 Disc. on washer. 100 disc. on wires, a (continued next page) 0

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l Page 3 of 3 T Ast t 2.1-2 f eont.1 htw_Tf_4 DONS (Ai[ST S:M EtttANCE :Nf0PMATICfs

SUMMARY

lencon Iho. Ember of

( kmoer of tendon Surv. Sury. Non-Effective t.iftoff cree. weres] Irw [1] Cate Typet?) wires toad !kiosi Co rros ion Cond i t ionl 31/Reat rb s

%W19(169) Top 06/23/S6 V O -

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VI-?3(169) Top 06/27/86 V O -

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%M-?T(169) Top C6/2T/86 V 0 -

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vs-31(169) Top 06/23/86 V O -

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%?9-32(169) Iop 06/23/86 V O -

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%?t- 3 3 ( 169 ) Icp 06/23/86 V O -

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201 E S f t y ref er_ence russbeJ:

1) trad scated by PCRV buttress number. If between two buttresses, indicated by both nearest buttress numbers. "O t ong e ttut i na l tendons indica ted by "Iop" or "Bottos". g'

2) L: L i f to f f and vi sua l in!pection of anchor assembly and wire bundle.

V: Ve sua s inspection of anchor assembly only. 5

3) Desc.: Descoloratson - Signifies the presence of any coloration which may have been caused by incipient corrosion. Q Sc89.: Scaleng - Indicates Ele presence of rust-like deposits which tightly adhere to the surface. g Omid.: Oxidatson - Indicates the presence of .ust-like deposits which are heavy enough to indicate that they could flake off the surface.

%) forst surve s i tance since original snstallation.

Paga 11 of 24 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 control group for visual inspection, were selected during the first six-month interim surveillance period and first presented in the January, 1986, report. These liftoff control tendons are as follows:

Top Bottom Circumferential Crosshead Crosshead Longitudinal CM 1.1 IIRM2 BIRM4 VM-10 CO 14.4 (load ceII) VI-20 CM 16.3 VM-40 The historical surveillance information summary, including 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 1253 kips, which compares very favorably with the two previous readings of 1264 kips and 1257 kips.

O. 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. The differences in measured liftoff load values noted for each control tendon

'from one liftoff ta the next are considered due to measurement system inaccuracies.

2.1.2.2 New Tendons Liftoff surveillance findings on the new tendons selected for liftoff testing for the first eighteen (18)-month interim surveillance program period covering July 21, 1985, to January 21, 1987, were reported in the last surveillance report, submitted under Letter P-86463, dated July 18, 1986.

The new tendens for liftoff testing for the second 18-month interim surveillance period, covering January 21, 1987, to July 21, 1988, wil be selected at a later date, with the report of the liftoff surveillance findings due July 21, 1988.

2.2 WORST-CASE TENDON SURVE!LLANCES As indicated in Section 1.0, this report also covers the O findings of the first performed on the tendons from the worst-case tendon group.

semiannual visual inspections

Pago 12 of 24-This group consists of the following five(5) tendons:  !

Worst-Case Tendons CO 2.5 CM 4.6 BILU3 BILU4 VM-30 A complete historical surveillance information summary including the findings during this first semiannual period for each end of each worst-case tendon is presented in Table 2.2-1.

Based on the latest available measured Ifftoff loads, each of the worst-case tendons continues to provide effective prestress for the PCRV. The latest liftoff load measured for each tendon is above the minimum design load for each tendon type as reported in Letter P-84135, dated May 7, 1984.

In addition, the number of non-effective wires for each worst-case tendon remains below the established criteria for the number of non-effective wires above which is mandated a specific engineering evaluation as established in Letter P-85071, dated March 5, 1985. For convenience, this non-O effecthe wire criteria is restated here: A specific engineering evaluation is mandated when the number of non-effective wires in any circumferential barrel (152-wire) tendon or in any other (169-wire) tendon is greater than or equal to twenty-three(23) or thirty-four(34) non-effective wires, respectively.

The number of non-effective wires observed for each end of each worst-case tendon has remained constant since at least March, 1985 (a period to date of over 21 months), except for Tendon 81LU3 in which was observed an increase of two(2) non-effective wires on End I-II between March, 1985, and May, 1986 (this increase was reported in the July, 1986, tendon report). This constancy in non-effective wire numbers for the worst-case tendons is a good sign that the rate of corrosion has likely subsided to a very low level in these tendons. This is a significant and optimistic observation with respect to the other PCRV tendons which currently exist in a considerably lesser-corroded state.

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Pag 215 of 24 Tendon CM 4.6, from which was drained approximately twenty-

m eight(28) gallons of water in March, 1986, and another

[d

) approximately 1.85 liters of water about 2-1/2 months later in June, 1986, was again opened and surveilled in November, 1986. At that time, a total amount of approximately 450 milliliters of water was drained from the tendon end caps.

Therefore, it was found that approximately one quarter the amount of water accumulated over approximately twice the time period when the November amount is compared to the June amount. This would seem to indicate that there is no constant influx of water into the tendon tube. Also, no additional non-effective wires beyond the twenty (20) wires observed during the original surveillance in April, 1986, were found in November.

It is still believed quite possible that the additional water found in November could be a result of additional evaporation of water from the interior interstices of the tendon wire bundle and from low spots in the horizontal tendon tube which could not fully drain during the original opening, followed by a recondensation of this water in the cooler regions of the end caps. The tendon has been closed back up and will be monitored again in a few months as part of the worst-case tendon group for signs of further water accumulation and/or any additional wire failure.

2.3 SUPPLEMENTAL TENDON SURVEILLANCES O

Q In a continuing effort to complete at least one surveillance on all accessible PCRV tendons, three(3) additional tendons over and above the control and new tendon groups for the interim surveillance program and the worst-case tendon group were surveilled during the past six-month period. The supplemental tendons which were surveilled are as follows:

Liftoff Test Visual Inspection One End Both Ends CM 1.2 CI 1.2 CM 2.2 Each of the above three tendons has no record of previous surveillance since original installation. Tendon CI 1.2 is not accessible for liftoff testing from either end, while Tendons CM 1.2 and CM 2.2 are accessible for liftoff from one end only.

1 No non-effective wires were' observed in any of the three tendons. The two supplemental tendons which had a liftoff test possess loads which are well above the minimum design load for that tendon type.

!o l

Page 16 of 24 2.4 COLLECTIVE TENDON SURVEILLANCE INFORMATION SUMMARIES

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2.4.1 Tendons with Non-Effective Wires Table 2.4-1 provides a complete summary of all tendon ends surveilled through November 30, 1986 (the effective surveillance cutoff date for this report), which have been observed with non-effective wires, and the number of non-effective wires in each. Table 2.4-1 is a revised update of Table 2.2-1 of the July,1986, tendon surveillance report (P-86463).

Since the July, 1986, report, four(4) additional tendons have been observed with non-effective wires: CI 5.1, CM 6.1, C0 1.2 and CO 4.2. None of the four tendons had been surveilled prior to the July report since original installation. As stated previously in Section 2.1.1.2, the number of non-effective wires found in these circumferential tendons is not out of line with non-effective wire numbers found previously in other circumferential tendons.

Of the twelve (12) tendons previously surveilled with non-

-effective wires prior to the July, 1986, report and resurveilled within the past six months, none were observed with an increase in the number of non-effective wires.

Through November 30, 1986, since March 1, 1984, of the total of 896 tendon ends existing on the PCRV, a total of 566 ends eI have been surveilled. Of these 566, a total of sixty-U' six(66) tendon ends, or 11.7 percent, have been observed with one or more non-effective wires. Presented another way, the 566 tendon ends surveilled represent a total of 334 tendons; i.e., 334 of the 448 total PCRV tendons have been surveilled on at least one end since March 1, 1984. Of these 334 tendons surveilled, a total of fifty-five(55) tendons, or 16.5 percent, have been observed with one or more non-effective wires. These 55 tendons include fifty (50) tendons with seven(7) or less non-effective wires each and only five(5) tendons with at least sixteen (16) non-i effective wires each.

I As can be seen in Table 2.4-1, not all of those tendon ends i observed with non effective wires prior to February 27, 1985 l (the cutoff date for the March, 1985, tendon surveillance report (P-85084)), have been resurveilled since that date.

Conversely, not all of the tendon ends observed with non-effective wires after February 27, 1985, were surveilled prior to that date.

The information in Table 2.4-1 shows that, in general, there continues to be no significant increase in wire breakage in those tendons surveilled more than once since increased surveillances began in March, 1984. With the exception of

(- the worst-case tendons, C0 2.5 and CM 4.6 (special case),

( the circumferential tendon group continues to exhibit only isolated cases of tendons with minor wire breakage.

l

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1 i

Page 1 of 3 TABLE 2.4-1 I

SUMMARY

Of TENDONS OBSERVLO WiiH NON-EFFECTIVE WIRIS Number of New 1ota1 Number or Additionai of Non-effective Non-effective-Number Total Number Wi res Observed Wi res Observed of Latest of Non-effective 02/27/85 thru 02/27/85 thru Tendon Tendon Original Surveillance Wi res observed La test Survel l- Latest Surveil-Number Endt11 Wires Date thru 02/26/85 f21. (3) lance Date f41 . lance Date VM-1 Bottom 169 06/02/86 1(5) 1 0 VI-2 Top 169 06/04/86 5 5 0 VM-8 Top 169 06/20/85 4 4 0 VI-10 Top 169 06/17/86 5 5 0 yM-10 Top- 169_ 09/2M 36 7 7 0 VM-11 lop 169 05/24/86 1 1 0 VO-14 Top 169 06/17/86 4 4 0 VM-17 Top 169 05/24/86 6(6) 6 0 VM-17 Bottom 169 05/21/85 3(7). 3 0 yM-29 Top 169 06/21L85 1 1 0 VM-30 Top 169 09/25/86 22 22 0 VM-31 Bottom 169 05/21/85 N/S 1 1 VI-35 Top 169 06/17/86 1 1 0 VM-37 Top 169 09/24/86 1 1 0 VM-42 lop 169 06/03/86 2 2 0 DILU3 1-11 169 11/14/86 16(8) 18 2(13)

BILU3 IV-V 169 11/14/86 20 20 0 BIRU3 1-11 169 05/15/86 0 1 1 i D I Luis I-Il 169 08/11/86 28 28 0 MLUls IV-V 169 07/22/f6 3f91 3 0 DORuis IV-V 169 O//01/86 3 3 0 81LL3 11-1Ii 169 11/12/85 0 1 1 00Li fs V-VI 169 11/13/86 1 0 0 BORL4 V-VI 169 11/13/86 2 1 0 BOLM3 fil-IV 169 08s/18/86 1 1 0 BILM3 VI-I 169 11/07/86 1 1 0 BOLMis ill-IV 169 12/26/85 3 3 0 DORMis Ii1-lV 169 04/17/86 1 3 2 y TIRL2 IV-V 169 02/22/85 1 N/S -

N 10RL2 1-11 169 06/26/86 1(10) 1 0 g TORL2 IV-V 169 06/26/86 1(10) 1 0 %a

, TOLM1 111-IV 169 02/01/85 1 N/S O ,

CO 1.1 N/R 169 10/85 2 O(Both Ends) O CM 2.1 1 169 10/21/85 N/S 2 2 P@

Cl 5.1 IIi 152 08/15/86 N/S 1 1 CH 6.1 Ill 152 08/15/86 N/S 1 1 Cl 15.1 1 152 12/03/84 1 N/S -

Cl 15.1 Ill 152 12/03/84 1 N/S -

CO 1.2 IV 169 09/20/86 N/S 5. 5 CO 1.2 VI 169 09/10/86 N/S. 1 1 CO 4.2 VI 152 08/20/86 N/S 1. 1 (continued next page)

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Pag 2 20 of 24 2.4.2 Tendon' Surveillance Historical Information

~

The PCRV Tendon Surveillance Plan drawings, showing (V graphical end views, with specific historical surveillance information, of all PCRV tendons, have been updated to include all tendon surveillances through November 30, 1986.

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.

2.4.3 Number and Percentage of Tendons 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 surveillances performed on them at least one time between March 1, 1984 (the approximate start date of increased tendon surveillances),

and November 30, 1986 (the effective surveillance cutoff date for this report). Table 2.4-2 is a revised update of Table 2.2-2 of the July, 1986, tendon surveillance report (P-86463).

For the table count, no tendon has been counted twice. All possible end combinations of surveillance types, including no surveillance, for any one tendon are categorically tabularized. Therefore, the total sum of surveillances (and m no surveillances) shown for each r.endon type (each column) equals the total number of tendons of this type in the PCRV.

As observed in Table 2.4-2, 334 of the total 448 PCRV tendons, or 74.6 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 4.7 percent in total tendons surveilled since the July,1986, tendon surveillance report. 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 interim surveillance periods until all accessible PCRV tendons have l

I been surveilled.

2.4.4 Conclusions l

l The following facts and conclusions can be drawn from the collective tendon surveillance information gathered to date since increased tendon surveillances began in March, 1984:

o Of the 298 total tendons' liftoff tested on at least one

end since March 1, 1984 (see Table 2.4-2), representing 66.5 percent of all 448 PCRV tendons, all possess load significantly (at least thirteen (13) percent) above the l minimum required load for each tendon type per GA l Document No. 907441, "FSV-PCRV Tendon Evaluation",

p submitted to the NRC under Letter P-86491, dated July Q 29, 1986.

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Page 22 of 24

~l o Of the 334 total tendons surveilled (visual or liftoff)

,, since March 1, 1984, which represents 74.6 percent of

~ all 448 PCRV tendons, none possess a number of non-(V) effective wires above the maximum allowable number which would trigger a specific engineering evaluation as established in Letter P-85071, dated March 5, 1985.

Moreover, of the fifty-five(55) tendons observed to date with non-effective wires (see Table 2.4-1),

fifty (50) tendons exist with only seven(7) or less non-effective wires each, and only five(5) tendons possess at least sixteen (16) non-effective wires each.

o Of the 131 tendons (29.2 percent of the total 448 tendons) surveilled after February 26, 1985 (effective surveillance cutoff date for the March, 1985, tendon surveillance report (P-35084)), and which had also been surveilled prior to that date, only four(4) tendons were observed to have an increase in the number of non-effective wires with the maximum increase in any one(1)

/ of those four(4) tendons being only two(2) wires. Even on those four(4) tendons showing an increase of one or two non-effective wires, it is quite conceivable that a liftoff test and/or tendon retensioning could have provided the impetus for these additional wire failures.

Therefore, based upon the lack of any increase in non-fs effective wires, evidence strongly suggests that Q corrosion is not continuing at any significant rate, if at all, in a very high percentage (probably 97 percent or better) of the PCRV tendons.

o It can be safely stated that there is a very high probability that every PCRV tendon will maintain viability, i.e., the capability of continuing effectiveness to carry load above the minimum required ,

load, for at least several more years and possibly quite longer.

2.5 TENDON LOAD CELL SURVEILLANCE As committed to the NRC in April,1984 (Letter P-84110, i dated April 12, 1984),. the twenty-seven(27) tendon load e cells are being monitored on a monthly basis for signs of excessive relaxation or load loss. Data has been recorded

(  ; monthly from May, 1934, through the current month (latest

data available for review for this report is November, 7 1986).

l A

review anywas June, discussion of load cell data available through 1986 included in the July, 1986, tendon

,urveillanci report (P-86463).

s From a review of the monthly data from May, 1984, through j November, 1986, there continue to be no signs in any of the i load-cell tendons of a general trend tcward additional load l

. _ . _ ____.....__..-.._.-____._.._.._____.___.______._.____.__.m

,s.

Page 23 of 24  ;

l-relaxation or load loss. Moreover, all load-cell _ tendons continue to possess a substantial load margin above the i- minimum design load for each respective tendon type.

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APPENDIX A i

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!- PCRV TENDON SURVEILLANCE l PLAN ORAWINGS

!- Drawing Number Tendon Type i i i 1A Longitudinal

! IB Circumferential i

Layers 2, 5 and'4-IC Circumferential

Layers 1, 6 and 3

-10 Top Crosshead Bottom Crosshead l

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OVERSIZE DOCUMENT .

PAGE PULLED i  :

SEE APERTURE CARDS NUMBER OF OVERSIZE PAGES FILMED ON APERTURE CARDS 4 l

APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH,TIDC FTS 492-8989 D

h 4

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