ML20207E955

Pcrv Tendon Interim Surveillance & Status Rept. W/Four Oversize Drawings

ML20207E955
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Site:	Fort Saint Vrain
Issue date:	07/31/1986
From:	PUBLIC SERVICE CO. OF COLORADO
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NUDOCS 8607220449
Download: ML20207E955 (31)

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I PCRV TENDON INTERIM SURVEILLANCE j

AND STATUS REPORT 1

l July, 1986 j

j FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO i

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Ab ABSTRACT This report is the second 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, (2) "new" tendons for visual inspection and (3) "new" tendons for liftoff testing.

Also, the findings of surveillances performed during the past six months on tendons in addition to the above program groups are summarized.

The major findings and conclusions reported herein include the following:

e No new non-effective wires have been observed in any of the control tendons, e

The load-carrying effectiveness of each control tendon for liftoff testing is not showing any signs of significant relaxation or degradation.

e Based upon the lack of an increase in non-effective wires, there o

is no indication that corrosion is continuing in all but one of

()

the thirty-four "new" tendons for visual inspection with previous surveillances.

e The PCRV tendon corrosion problem continues to be random in nature among the tendons of each tendon type.

e Top crosshead and circumferential tendon observations continue to show that these tendon types have not been subjected to the degree of corrosion observed in the bottom crosshead and longitudinal tendons, with one unique exception: Tendon CM 4.6.

e Approximately twenty-eight gallons of water was drained from the tube and end caps of Tendon CM 4.6.

e Liftoff loads measured for each of the "new" tendons for liftoff testing are well above the minimum design load for each tendon.

e All supplemental tendons lifted off possess loads well above the minimum design load for each tendon.

e Only one of the nineteen supplemental tendons surveilled was observed with a non-effective wire.

e Three hundred and nineteen (319) of the total 448 PCRV tendons, or l

71.2 percent, have had at least a visual inspection on at least

/7 one end at least one tiiie since March 1,1984.

U e

Of the 319 tendons surveilled since March 1, 1984, a total of fifty-one, or 16.0 percent, have been observed with non-effective i

l

Od wires--forty-six tendons with seven or less non-effective wires each and only five tendons with at least sixteen non-effective wires each.

e In general, there continues to be no significant increase in wire breakage in those tendons surveilled more than once since March 1, 1984.

e From monthly tendon load cell data, there are no signs in any of the load-cell tendons of a general trend toward load relaxation or lead loss.

f l

Investigations and preparations are continuing with respect to l

remedial measures to improve tendon corrosion protection.

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1 CONTENTS

1.0 INTRODUCTION

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

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

2.1.1 Visual Inspection

................2 2.1.1.1 Control Tendons............. 2 2.1.1.2 New Tendons............... 2 2.1.2 Li f tof f Te sti ng.................

15 4

2.1.2.1 Control Tendons............

15 2.1.2.2 New Tendons..............

16 1

2.2 SUPPLEMENTAL TENDON SURVEILLANCES...........

18

()

2.3 COLLECTIVE TENDON SURVEILLANCE INFORMATION SUMMARIES..

18 l

2.3.1 Tendons with Non-Effective Wires........

18 1

2.3.2 Tendon Surveillance Historical Information...

21 2.3.3 Number and Percentage of Tendons Surve111ed To Date.....................

22 2.4 TENDON LOAD CELL SURVEILLANCE.............

22 I

3.0 STATUS OF PREPARATIONS TO REMOVE AND 1

REPLACE EXISTING PCRV TENDONS................

24

{

APPENDIX A: PCRV TENDON SURVEILLANCE PLAN DRAWINGS.......

26 l

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Page 1 of 26

1.0 INTRODUCTION

This report is being submitted to comply with the requiremerts 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).

This report is the second semiannual report to be submitted under this program; the first six-month report was submitted in January, 1986, under Cover Letter P-86042, dated January 22, 1986.

As explained in the January report, this interim surveillance program has been implemented for a period of three years or until such time that effective corrosion control has been established. The effective start date for this three year program was established as July 21, 1985, with the findings of the tendon surveillances performed during each six-month period to be reported at the end of each period.

The present report therefore reports the findings of tendon surveillances performed since the January report; more specifically, the actual tendon surveillances covered under this report were performed during the period January 5,

1986 through June 20, 1986. Also (O

included are the findings of the liftoff tests performed V

on the new-tendon group selected for liftoffs for the first eighteen (18)-month interim surveillance program period.

Investigations and preparations are continuing with respect to remedial measures to improve tendon corrosion protection, to deal with existing corrosion-caused effects and to improve the continuous monitoring of tendon effectiveness. The proposed measures and actions being studied and prepared for were discussed in detail in the January,

1986, report.

The updated status of preparations to remove and replace existing PCRV tendons is included in this report.

2.0 PCRV TENDON SURVEILLANCE INFORMATION 2.1 FINDINGS OF THE SECOND SIX-MONTH INTERIM SURVEILLANCE PROGRAM PERIOD The PCRV tendon interim surveillance program scope, definitions and requirements were reviewed in detail in Section 2.1 of the January, 1986, report. The findings of the surveillances performed during the second six-month interim surveillance period are reported here.

For ease of comparison and cohesiveness from report to

report, the tabular, graphical and text format of findings are reported in the same manner in this report l

Page 2 of 26

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as they were for the January report.

(J 2.1.1 Visual Inspection 2.1.1.1 Control Tendons The control tendon group for visual inspection is that group of tendons which, once selected, remains the same for each semiannual visual inspection period.

The tendons chosen as control tendons for visual inspection, selected during the first six-month interim surveillance period and initially presented in the January, 1986, report, are as follows:

Top Bottom Circumferential Crosshead Crosshead Longitudinal CM 1.1 TIRM2 BIRM4 VM-10 C0 14.4 BILM3 VI-20 CM 16.3 VM-20 VM-37 VI-40 VM-40 A complete historical surveillance information summary including the findings during this second six-month (O

interim surveillance period of each end of each control d

tendon is presented in Table 2.1-1.

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

Therefore it is concluded that, to date, the rate of corrosion in the control tendons has still not approached any level of immediate concern.

2.1.1.2 New Tendons l

The new tendons selected for visual inspection for this second six-month interim surveillance period are as follows:

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.p PJtd af 3 TABLE 2.1-1 CONTROL TENDO _MS HISTORICAL SURVEILLANCE INFORMATION

SUMMARY

Number of Tendon No.

(No. of Tendon Surv.

Su rv.

Non-Effective Liftoff JypeL2]

Wires (3)

Load 1 kips _1 Co rros ion Cond i t ion (8 )/Rema_r_hs L

y Orig. Wirest

[rLd{ 11 Date CM 1.1 1

06/12/86 L

0 1371 Disc On washer. No disc. On wires.

(169)

I 10/15/85 L

0 1392 No disc. found on washer or wi res.

Mold found on wires, i

10/02/8fs L

0 1315 Lack of grease present. Rust visible throughout wire bundle.

Ill 06/11/86 L

0 13184 Di sc. On washer. No disc. On wires.

Ill 10/17/85 L

0 1327 No disc. found on washer or wi res.

Ill 10/02/814 L

0 1275 Ve ry l i t t l e g rea se p resent. Rust visible throughout wire bundle.

L 0

1275 Disc. On washer. No disc on wires.

(152) 18 12/20/85 L

0 1237 No disc. on washer or wires. Wires CO 14.4 11 06/07/86 greasy.

Il 10/17/84 L

0 1180 Some grease present. Rust present throughout wire bundle.

VI 06/09/86 L

0 1208 Disc. on washer. No disc on wires.

VI 12/19/85 L

0 1196 No d i sc. On wa she r.

No oxid, on wires.

VI 10/17/884 L

0 1150 Lack of grease present. Rust visible throughout wi re a rea.

CM 16.3 Ill 06/07/86 L

0 1387 Disc. on washer. No disc on wires.

(169) til 12/13/85 L

0 1380 No disc. on washer or wires. Wi res clean and greasy.

Ill 03/25/85 L

0 1352 No rust on washer or wi res.

Medium grease on wi res.

V 06/11/86 L

0 1372 Disc. On washer. No d i sc. On wi res.

V 12/16/85 L

0 1373 No disc. on washer.

Oxid. 5n both sides of wire bundle.

V 03/26/85 L

0 1368 No rust on washer. Rust and medium grease on both sides wire bundle.

TIRM2 til-IV 05/21/86 L

0 1392 No, disc. on washer.

Oxid. on some wires.

(169)

Ill-IV 12/18/85 L

0 1377 No disc. on washer or wires, No visible rust on washer or wi res.

Oxid, lit-IV 02/05/85 L

0 1364 on shims inside surface.

VI-I 05/20/86 L

0 1391 Disc. on washer.

Oxid, on some wi res.

VI-t 12/17/85 L

0 1380 No disc. On washer or wi res. Wi res greasy.

VI-I 02/13/85 L

0 1370 No rust on washer. Rust and scale on shims. Rust, scale and pitting on wires.

01/18/86 L

0 1395 Disc. on Washer. No disc. on wi res.

(169) til-IV 12/30/85 L

0 1372 No disc. On washer or wires.

,3 Ill RMrs lit-IV 4

m lit-IV 03/85 V

O Not reported.

til-IV 09/11/884 L

N/R 1291 No rust found on wires. Wires need grease.

01/01/84 V

N/R Brg, plate and shims rusted.

w Ill-IV 4

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M P.d%,j c r 3 TABLE 2.1-1 (cont.1 CONTROL TENDOMS HISTORICAL SURVEILLANCE INf0RMATION

SUMMARY

Tendon No.

Number or (No. of lendon Surv.

Surv.

Non-Errective Liftorr Oria. Wires)

End(1)

Date hoei2)

Wiresf3) toad 1 kipM Corrosion Conditionf 41/Rema rks (Load Cell)

Vl-l 04/29/86 L

0 1364 Disc. on washer. No disc. on wires, toad cell liftorr value: 1264 kips.

VI-l 11/27/85 L

0 1344 No disc. on washer or wi res.

Load cell liftorr value: 1257 kips.

VI-I 03/85 V

O Not reported.

VI-I 09/11/84 L

N/R 1307 Rust present in wire bundle.

Lack of grease present.

VI-I 04/01/84 V

N/R Brg, plate corroded.

VI-I 12/71 V

N/R Co rroded.

BILM3 lit-IV 014/18/86 L

0 1388 Disc. On washer. No disc. On wi res.

(169) til-lV 01/03/86 L

0 1352 No disc. on washer or wi res, lil-IV 03/85 V

O Not reported, ill-IV 09/12/884 L

0 1287 Mold and rust present in wire bundle.

Lack or grease present.

Ill-IV 014/01/84 V

N/R Brg plate rusteo.

Of/30/86 L

1 1319 Disc. on washer. No d i sc On wi res.

VI-I 4

VI-I 12/03/85 L

1 1298 No disc. On washer or wires. Greasy.

VI-I 03/85 V

1 Not repo rted.

VI-I 09/12/884 L

1 1279 Rust on tendon tube.

Wires well g rea sed.

VI-I 014/ 0 1 / 814 V

N/R B rg. plate and shims corroded.

1813 Disc. on washer. No disc. on wires.

VH-10 Top 05/28/86 L

7 4

4 (169)

Top 06/20/85 L

7 1388 Disc. on brg. plate.

No disc. on washer.

Localized oxid, in wire bundle.

Top 01/17/85 V

7 No disc.

01/09/884 L

3 1344 Not reported.

Top 4

Top 03/28/84 V

3 Condensation in cover.

1159 0xid, on Washer. No d i sc. on wi res.

VI-20 Top 05/28/86 L

0 4

4 (169)

Top 06/21/85 L

0 1437 Washer, shims, b rg. plate and accessible wires in good condition.

j Top 01/30/85 V

0 Not reported.

02/17/814 L

0 14f3 Co rros ion in interior or wire bundle.

Top 4

4 l

Top 03/27/884 V

N/R No disc.

I VM-20 Top 05/28/86 V

O Disc. On washer.

i 4

(169)

Top 06/21/85 V

0 Di sc. on brg. plate.

i 10p 01/30/85 V

O Not reported.

1819 Co rros ion in interior of wire bundle.

01/17/884 L

0 Top 44 4

Top 03/27/8f4 V

N/R Dry spots.

u VM-37 Top 06/16/86 V

1 Di sc. on washer.

i (169)

Top 06/19/85 V

1 Sca l ing shims and brg, plate.

m One ra i sed btnhd. bent over.

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r 3 TABLE 2.1-1 (cont.)

CONTR01 T ENDOftS HISTORICAL SURVEllLANCE INFORMATION

SUMMARY

Tendon No.

Number or (No. 00 Tendon Surv.

Surv.

Non-Errectivo Liftorr Orio. Wires)

Ind(1)

Date Type _[Z1 Wiresf31 Load Ikiost Corrosion Condition [41/Rema rks Top 01/19/85 V

1 No disc.

01/09/814 L

1 1444 Corrosion on -interior or Top 4

wire bundle.

Top 03/28/84 V

1 Water in cover.

V I-r40 Top 06/04/86 V

O Disc. on washer.

(169)

Iop 06/18/85 V

O No disc.

Top 01/30/85 V

O Not repo rted.

Top Ol4/19/814 L

0 1438 Corrosion in core of wire bundle.

Top 03/28/84 V

N/R Water in cover.

VM-40 Top 06/04/86 L

0 14514 Di sc. on washer.

Oxid. on one wire.

(169)

Top 06/18/85 L

0 1437 Localized oxid. on wi res in interior or bundle. No disc. On washer.

Top 01/30/85 V

O Not repo rted.

01/19/884 L

0 If433 Localized corrosion in core of wire bundle.

Top 4

Top 03/28/84 V

N/R Wa ter in cover.

, NOTES fby reference number):

1) Indicated by PCRV buttress number.

If between two buttresses, indicated by both nea rest buttress numbers. Longitudinal tendons indicated by "Iop".

2) L: Liftorr and visual inspection of anchor assembly and wi re bundle.

V: Visual inspection of anchor assembly only.

3) N/R: Not repo rted

4) Disc.: Discoloration - Signifies the presence or any coloration which may have been caused by incipient corrosion.

ScIg.:

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

Oxid.: Oxidation - Indicates the presence or rust-like deposits which are heavy enough to indicate that they could flake 000 the surface.

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Top Bottom

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Circumferential Crosshead Crosshead Lonoitudinal C0 5.5 TOLL 1 BILU3 VI-1 VI-25 CM 6.5 BIRU3 VM-1 VI-26 CO 8.5 BORU3 VI-2 VI-30 CM 9.5 BOLM3 VM-2 VM-30 C0 9.5 BIRM3 VI-10 VM-31 CM 11.5 BORM4 VI-11 VI-32 CO 11.5 VM-11 VI-33 CO 2.6 VI-13 VI-34 CI 4.6 VM-14 VI-35 CM 4.6 V0-14 V0-35 CI 5.6 VI-17 VI-42 CM 5.6 VM-17 VM-42 CI 6.6 A complete historical surveillance information summary including the findings during this second six-month interim surveillance period of each end of each new tendon is presented in Table 2.1-2.

The number of new tendons for visual inspection of each tendon type which have been observed at any time recently or previously with at least some discoloration and/or corrosion on any of the anchor assembly parts or in the

(T

)

wire bundle (observable only during liftoff) on either end are as follows:

circumferential:

twelve (12) out of thirteen (13); top crosshead:

one(1) out of one(1);

bottom crosshead:

six(6) out of six(6);

and longitudinal: twenty-one(21) out of twenty-four(24).

The total number of n2w tendons for visual inspection of each tendon type observed with non-effective wires are as

.follows:

two(2) circumferential, four(4) bottom crosshead and ten (10) longitudinal. The actual number of non-effective wires observed in each of these tendons is given in Table 2.1-2.

Out of a total of forty-four(44) new tendons for visual inspection, thirty-four(34) have had at least one surveillance prior to the start of the interim surveillance program. Based upon non-effective wires, there is no indication that corrosion is continuing in thirty-three(33) of these thirty-four(34) ney? tendons; i.e.,

there has been no increase in the number of non-effective wires in these 33 new tendons when the most recent surveillances are compared to the next previous surveillances. Tendon BILU3 did show an increase from sixteen (16) to eighteen (18) non-effective wires in a fourteen-month period.

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l'a g e 1 of 8 TABLt 2.1-2 N1W 11NDONS H I SJ 0!!1 CAI SURVill.lANCr INf0HMATION

SUMMARY

f Tendon No.

Number or (Number of lendon Surv.

Surv.

Non-ifrective Iirtorf' Orim_ Mires) f rad [1]

Site lype[?]

Wi res(11_

Load _lkips[

Co rros ion Cond i t io!!18 }/ftema r k s CO 3.1 1

IH/?5/ 8's 1

0 1389 No disc. on washerr or wa res.

Wi res d ry.

Smal1 amouret or mold present.

i169)

(load Cell) lli IU/31/flS I

O 1367 No disc. on washer.

Oxid. on a few wires.

Load cell value at liftoff = 1219 kips.

i Cs 4.3 1

t o/ 3n/tt's I

H I?9'>

No d i sc. on wa she r o r wi res.

(IS?)

lli 11/uS/t$5 1

0 12$9 Disc. on washer and shims.

Ossd.

on one wire, others no disc.

t I

CO 12.2 IV OS/1//8's I

1 I l 9's No d i sc. on wa she r o r wi res.

( 15. ' )

VI O's/06 / ft's 1

1 1205 No disc. on washer or wi res.

I CM I$.2 IV 0S/31/85 i

O I?33 No disc. on washer or wi rus.

( l'22 )

VI O's/ Pla /ft's t

0 1243 No disc. On washer or wi r es.

CM *>. 3 Ill 09/06/8's 1

0 12$8 No disc. on washer or wires.

( l's? )

V 09/Ols /t!'s L

0 I?39 No disc. on washer or wires.

CM 10.3 Ill 10/HP/85 I

O 118 9 Disc. On washer.

Oxid. on shims.

8 No degradation or wires noted.

(152)

V 10/O l/t!'s t

0 1215 No disc. on washer.

No degradation or wires noted.

Cl 4.14 ll 08/19/8's 1

0 1397 No disc. on washer or wires.

(169)

VI 08/??/8S l

u 18:11 No d i sc. on wa she r o r w i re s.

C1 10.4 it U / /16/ 3's 1

0 1176 Oxid. On shim.

No d i sc. on wa she r o r wires.

(152)

VI O l/Pls /tt's t

0 12184 No d i sc. On wa she r o r w i re s.

Cl 5.5 1

01/13/tl6 L

0 1197 No d i sc. On washe r or w i e n s,

(152)

V 01/16/fl6 6

0 12384 No disc. On washer or wi res, left s info

( right side not accessible for inspection).

CO S. ')

i Ol/18 /fl6 1

0 1225 No disc. on washer or wires.

4 (152)

V 01/11/86 1

0 1213 No disc on washer os wires.

CM 6.5 1

01/IS/tl6 1

0 12?S Disc. On washer.

Oxid, on P wires, m

(15?)

V nl/?I/tl6 I

0 1219 No disc. on washer.

Oxid. on 3 wires.

]

V 03/30/84 V

N/R Washer rusted. Bea rsng plate corroded.

4 CM !!. 5 1

02/03/t56 1.

O 1185 No disc. On washer or wi res.

N (15?)

V 01/30/fl6 1

0 1832 Disc. on washer.

No disc. on weres.

- continued next page ym

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Page 3 of 8 TAHIE 2.1-2 icont.I Ni W_1( NDONS HISJOHICAl. SURVI til ANCI INF0HMATION

SUMMARY

lendon No.

Number of (Number of letedon Susv.

Saas v.

Non-1Irective tirLofT Dew _

lype(P)

___MiresOj__

[,o a d l h igts {

Co rros i orj_Cond i t iord 80/Mayna ds O r_i& Wires)

1. s u.1( 1 )

i Cl

's. 6 Il n 3/1//tl6 i

O 1186 0xid. on washer threads. No desc. on wires.

(15?)

IV H 3/7 //t16 V

H Disc. on wa stie r.

CH 's. 6 II H3/1//tl6 1

0 1116 Dis, on washer. No alisc. on wi res.

( l'>2 )

IV 03/2//86 1

0 1262 Di sc. on wa sher.

No disc. on wi res.

Cl 6.6 11 ol/?6/tt6 1

0 11684 Disc. on washer. No disc. on wires.

( l's? )

IV 03/26/ti6 V

U Disc. on washer.

i CM 6.6 11 03/20/86 8.

0 1139 0xid. on washer tisreads.

No omid, on wires.

( l'>2 )

11 0 3 / 30/till V

N/H Washer rusted.

llea ring pla te corroded.

IV 03/26/86 L

0 12184 Disc. oli washer. No disc. ose wires.

10t l 1 1-11 o's /11/ fl6 1

0 18:29 No disc. On washer or wires.

(169) 1-18 u?/ lts/ tW L

U 18409 No disc. On washer or wi s es.

IV-V O's/2P/fl6 L

0 13h8 0xid. on washer race.

No disc. On wires.

IV-V O2/ 26 / tt'>

I O

1331 No d i sc. On washer or wi res.

1 (18103 1-11 0's /1's/86 1

18 1016 Disc. on washer. No disc. on wires.

(169) l-ll H3/16/8'>

V 16 Not repo r ted.

1-11 08/18a / 8's i

N/R 1233 0xid. on wires. Detensioned, IP non-eff'ective wires pulled, retensioned.

IV-V O's/16/86 1

20 121s9 Disc. on washer. No disc. on wires.

IV-V 0 3 /16/ tt's V

20 Not repo r t ed.

IV-V Utl/ I ta / tils L

19 1209 Oxid, ore wires. Detensioned, 12 non-eff'ective wires pulled ( same wi r es ass I nd 1-1I), retensioned ( l wi res ia a led durisig re ten s ion i sig ).

i IV-V Ols/13/8's i

12 1228 Oxid, on washer.

(84 wires failed during i

lirtorr.)

Ill HU 3 1-18 o's /1's / 86 1

1 1390 Di sc. on washer. No disc. on wires.

(169) 1-11 O S /1 *> / ts's V

1 Not reported.

1-11 011/ ? 1/ 884 l-N/R 1215 No disc.

01/01/88:

V N/R Scale on washer.

1-11 4

IV-V O's/16/ti6 1.

O 13114 Di sc. on washer. No disc. on wises.

IV-V 0 3 /1's/ tt's V

O Not reported.

IV-V uti/71/tils i

N/R 1339 No disc.

o 4/-V Ols/u l/tlla V

N/H Oxid, on washer, su in*

150HU 3 1-11 O*s/1 1/t16 i

O 13914 Disc. On washer. No disc. on wires.

to (169) l-1i ul/16/ tt's V

O Not repo r ted.

1-11 Ot1/Pn/ flit i

N/H 1219 Scale on l owe r 1/ 3 o f' w i r e bund l e,

o 08 / 0 1/ 884 V

N/H Scaleng on washer.

4-18 4

- continued next p.s y e

4 m

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V

%.J G

P.sgu la of 8 IABtf 2.1-2 Icont.1 i

NTW ![NDONS H1SIORICAl SURYL1ttANCE INIORMAIION SHMMARY lendon No.

Number of

( Numbe r o f lernlon Susy.

Suev.

Non-ffrective t.i f tof f Ofim_ Wires)

[ ey1( 1 )

D.i t e _

lypot[2]

Wiresf3) t oad JMMI Co rro s i on Cond i t ionL4U.Heaialhs DOHul (cont.)

IV-V 0's/16/fl6 1

0 1399 Disc. on wa sher.

Oxid. on S wires.

Not repo r ted.

(169)

IV-V U1/16/85 V

U IV-V ut1/?u/884 i

N/H 13$2 No disc.

Sca le on washer.

IV-V His/01/8ts V

N/R Illi t 1 11-111 11/1?/ tis I

1 13614 0xid. On washer. No disc. On wires.

(169) li-lil 01/1 ts/t1S V

1 Not reported.64-111 o's / 01/ 8's V

N/H Scale on washer.

V-VI II/Pu/85 1

0 1380 No disc. on washar.

Oxid. On 6 wires.

V-VI 01/18/8';

V ll Not reported.

V-VI Ols/01/ fl8s V

N/R Sca le ors washer, llot M3 lit-IV 08s / I t1/t16 1

1 13/6 Disc. ori washer. no disc. on wises.

(169) til-IV 01/03/86 1

1 13848 No. disc. on washer or wises, til-IV H 3 /11'>

V 1

Not repo rted.

til-IV 0 9 / 18s/ 886 i

N/R 1283 Scale on wire and sh i sis.

Ill-IV uts /01/ tt8s V

1 Not repo r ted.

VI-l US/u l/t16 1

0 13/6 Disc. on washer.

No disc. on wires.

VI-I I?/03/85 1

0 1360 No disc. wastier or wi res.

Not reported.

VI-l 01/85 V

U VI-I 09/ lis/ ttle i

N/H 1311 No disc.

i Scale on washer.

VI-I Hls/01/888 V

O Ill HH1 til-IV His /??/ti6 1

0 1350 Disc. on washer.

No disc. on wires.

(169) til-IV U 1/H?/t56 1

0 1321 No d i sc. On wa she r or w a res.

Not reported.

lit-IV 0 3/ tl5 V

U lit-lV 09/06/888 I

N/H 1309 No disc.

Ill-IV His/01/88:

V N/H Scale on washer.

VI-I H84/ 30/86 1

0 1385 Di sc. on washer. No disc. on weres.

VI-l I?/uls/8S I

o 1312 No d i sc. on wa she r o r w i re s.

VI-l H 1/11'>

V H

Not reported.

VI-I 09/06/884 i

N/H 1279 No disc.

I VI-l His/O l/8is V

N/H Scale on washer.

j DORHis lil-IV 08s/1 1/116 4

3 13$6 Di sc. on washer. No disc. on wires.

(169)

Ill-IV 12/31/85 1

3 1356 No disc. On washer or wi res, Not re po rted.

til-IV 03/85 V

3 Ill-IV 09/05/tlis t

N/R 1299 0xid, on wires and tube, m

D' til-IV uts/01/tlla V

1 Sca le on washer.

VI-l 08s/P S/tl6 t

0 18 05 Disc. on washer. No disc. on wires.

VI-I 11/P6/8S I

O 1380 No disc. on washer or wi res.

VI-I 05/8S V

O Not reported.

VI-I 09/ 05/ 88e I

N/f 1332 No disc.

O VI-l 08s/ 0 1/ 886 V

N/R Sca le on washer.

- continued nemt page ro m

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Page 6 of 8 LABLF 2.1-2_.[corL J NIW 1[NDONS lilSIORICAL SURVElll AliCl INFORMATION

SUMMARY

Number of tendon No.

(Number of lersdon Surv.

Surv.

Non<!frective Iirtoff O_ rig. Wiresj i nd[J_)

the t e Iypq(2)

Wires [J1_

[.p a d lkipsi Corros ion Cond i tion [fijfjlema r ig Disc. ori washer.

VM-18e lup o's / ?'s / ft 6 V

O No disc. On washerr.

(169) lop u 1/1// 8*2 V

n 18 30 No disc.

lap 04/14/84 1.

O 4

lop 03/28/814 V

N/H No disc. On washer.

18 2's Disc. on wa she r.

Wires siot. accessible VO-18e lup 06/11/86 L

86 4

for inspection, (169)

No disc. On washer, lop 01/11/8's V

84 0 #/09/8Ja 1

8s 1380 Not reported. Wi res riot accessible.

3 lop Oil emulsified witti water.

lop 03/28/8f4 V

14 1860 No disc. on washer or wi res.

V8-l/

lop O's/28s/86 L

0 4

No disc. on washer.

(169) lop 01/11/8')

V O

08/16/81a 1.

O 18:33 No visible corrosion, loss 4

No disc. On washer.

lop 03/28/81s V

N/R VM-11 lop OS/?ta/86 L.

6 18 16 Disc. On washer.

Oxid. on 2 wires.

No disc. On washer.

(169)

Iop 01/I//8S V

6 lop 084/11/88a I

6 131$

Oxid on 2 wires. Detensioned. suspected, retensioned (one wire railed during retensioning).

No d i sc. on washer. One wiro removed tor Iop uts/OS/8ts V

examination.

lop 03/23/88 V

is Crease coverage poor; dry spots.

No disc on washer. No water.

(Load Cell) llottom O*2/21/85 V

3 No disc. on washer. Detensioned.

08 /0$/81s V

3 Sottom 4

2 wi res removed for examina t ion.

Di sc. On wa sher.

V I -2's top 06/16/86 V

O Not repo rted.

(169) lop 01/3../85 V

O 18 32 No visible corrosion, lop 04/18/84 1.

O 4

No disc. On washer.

lop 03/28/88:

V N/R No disc. On washer.

VI-26 lop 06/16/86 V

O Not reported, (169) lop 01/30/8*>

V O

No disc. on washer.

lop 03/21/884 V

N/R VI-30 top 06/11/86 L

0 1316 Di sc. On washer. No disc.on wires.

No disc. on washer.

[

(169) lop 0 1/ I 1/882 V

O in 08 / 0 9 / 88:

I o

18:06 No disc.

4 lop No disc.

lop 03/29/88a V

N/H VM-30 lop 06/16/t16 4

22 1312 Disc. on washer.

Oxsd. on one wise.

f No disc. On washer, o,,

(169) lop O I / l l/M's V

22 lop O'4/09/8'4 4

21 1296 0xid. obse rved in wares.

Not reported, lop 03/29/88s V

21 m

1

- continued next page

Page 13 of 26

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1 AIM ?.1-? (cont.1 NJW_JJNDONS lii S I Olt I CAL SUHVE I L t. ANCf 1NIOl<MATION

SUMMARY

i NOIIS { t>y,y e f e rence pumise r ) :

1) todica ted by PI:HV t,ut t ress numtses.

It between two buttresses, indicated by both nearest buttresu numbers.

t orig i t ted i na l t e ntf ut e.

e nd ica terd by " lop" o r " Hot tom"

]

5

?)

t.:

i i f tuf'r acid v e su.e l inspection of anctior assembly and wi re t2undle, j

V: Visual suspecison of a f ectio r a s senta s y uni t y.

i

3) N/It: Not reported 84)

Disc.:

Discolorat enes - Signifies trio presernce or ariy coloration which may have been caused by incipient cortosion.

s i

Scig.,

Scaling - Indicates time presence of rust-like deposits which Lightly adhere to the surface.

Oxid.:

Oxidatiori - Indicates the presence of rust-like deposits which are heavy enough to indicate that they could i' t a ke o f f the surface.

i i

1 I

1 l

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Os to 6

(D

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ru e

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Page 15 of 26

[V]

Of the ten (10) remaining new tendons for visual inspection with no previous surveillance record, two(2) tendons were observed with non effective wire (s): Tendon CM 9.5 with one(1) non-effective wire and Tendon CM 4.6 with twenty (20).

Tendon CM 4.6 deserves special comment. On March 13, 1986, during the course of normal tendon surveillance as part of the interim surveillance program, approximately twenty-eight(28) gallons of water were drained from the tube and end caps of Tendon CM 4.6.

This was the first time that this tendon has had a document inspection since original installation in 1970. This finding, including a postulation as to the source of the water and the corrective action taken to date, was reported fully in Voluntary Licensee Event Report (LER) Number 84-005-04, Report Date June 16, 1986, submitted under Letter P-86394.

Since the submittal of the above LER, on June 20, 1986, the tendon end caps were again removed frorn Tendon CM 4.6 for a visual inspection. This inspection re: ulted in an additional approximately 1.8 liters of wtter being collected from the end caps. No additional non-effective wires beyond the twenty (20) wires observed during the original surveillance in April, 1986, were found.

It is believed possible that the additional water found in CM 4.6 in June could be a result of evaporation of water from the interior interstices of the tendon wire bundle which did 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 anain in a few months for further water accumulation and wi.e failure.

The new-tendon observations during the second six-month interim surveillance program period continue to demonstrate that the PCRV tendon corrosion problem is random in nature among the tendons of each tendon type.

The observations of the latest new-tendon group also r

i continue to show that the circumferential tendons have been subjected to some corrosion, but not to the degree observed for the bottom crosshead and longitudinal tendons.

The sole exception to this is Tendon CM 4.6, observed with unique and unprecedented conditions, as discussed above.

2.1.2 Liftoff Testing 2.1.2.1 Control Tendons O

s The control tendon group for liftoff testing is that l

v group of tendons which, once selected, remains constant

Page 16 of 26

(*)

in identity and number during each six-month period of t'-^'

the interim surveillance program. The tendons chosen as control tendons for liftoff testing, selected during the first six-month interim surveillance period and first presented in the January, 1986, report, are as follows:

Top Bottom Circumferential Crosshead Crosshead Longitudinal CM 1.1 TIRM2 BIRM4 VM-10 C0 14.4 (load cell)

VI-20 CM 16.3 VM-40 The historical surveillance information

summary, including measured liftoff loads, for each of these liftoff control tendons (included in the control group for visual inspection) is presented in Table 2.1-1.

The load cell reading during the most recent liftoff on BIRM4 was 1264 kips, which very closely compares with the previous liftoff reading of 1257 kips.

The load-carrying effectiveness of each of the control tendons is not showing any signs of significant relaxation or degradation as compared to earlier liftoff test surveillance results. The differences in measured 7

liftoff load values noted for each control tendon from (V

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

The range of these liftoff load differences is not considered to be overly significant.

The tendon liftoff loads measured to date for the control tendons, in all cases, continues to be well above the minimum design loads as reported previously in Letter P-84135, dated May 7, 1984.

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 selected for six-month visual inspections during the 18-month period.

The new-tendon group for liftoff testing for the first 18-month interim surveillance program period, covering July 21, 1985, to January 21, 1987, has been s..t.cted and the liftoff tests completed. The findings of the liftoff surveillances performed on these tendons are reported in this tendon surveillance report.

The next 18-month surveillance report on new tendons for liftoff testing O

will be due July 21, 1988.

C

Page 17 of 26 m

(

)

The new tendons randomly selected for liftoff testir, for G'

this first 18-month interim surveillance period ar1 as follows:

Top Bottom Circumferential Crosshead Crosshead Longitudinal C0 3.1(load cell) TOLL 1 BIRU3 VM-1 CI 4.1 BILL 3 VI-2 CO 12.2 BORM4 VI-10 CM 15.2 VM-11 CM 5.3 V0-14 CM 10.3 VI-17 CI 4.4 VM-17 CI 10.4 VI-30 CI 5.5 VM-30 CM 8.5 VM-31 CM 10.5 VI-35 CM 2.6 VM-42 CM 6.6 The historical surveillance information

summary, including measured liftoff loads, for each of these liftoff new tendons is presented in Table 2.1-2.

Tendon CO 3.1 is the only new tendon selected with a lead cell O

at its liftoff end. The load cell reading at liftoff was Q

1219 kips.

The number of new tendons for liftoff testing of each tendon type which have been observed at any time recently or previously with at least some discoloration and/or corrosion on any of the anchor assembly parts or in the wire bundle on either end are as follows:

circumferential:

nine(9) out of thirteen (13);

top crosshead:

one(1) out of one(1); bottom crosshead:

three(3) out of three(3); and longitudinal:

eleven (11) out of twelve (12).

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

one(1) circumferential, three(3) bottom crosshead and ten (10) longitudinal. The actual number of non-effective wires observed in each of these tendons is given in Table 2.1-2.

Out of a total of twenty-nine(29) new tendons for lif tof f testing, seventeen (17) have had at least one visual inspection prior to the start of the interim surveillance program and, of these 17, fifteen (15) tendons have had a liftoff test.

Based upon non-effective wires, there is no indication that corrosion is continuing in these 17 O

new tendons; i.e.,

there has been no increase in the V

number of non-effective wires in these 17 new tendons

Page 18 of 26

/7 when the latest surveillances are compared to the next d

previous surveillances.

Additionally, of the 15 new tendons for liftoff testing which have had a liftoff test prior to the start of the interim surveillance program, none have shown any signs of significant liftoff load loss, due to wire relaxation or tendon degradation, when compared to earlier liftoff loads. Moreover, the liftoff loads measured to date for each of the new tendons are well above the minimum design load for each tendon.

2.2 SUPPLEMENTAL TENDON SURVEILLANCES In an effort to complete at least one surveillance on all accessible PCRV tendons in a timely manner, additional tendons over and above the control and new tendon groups for the interim surveillance program were surveilled during the past six-month period.

The supplemental tendons which were surveilled are as follows:

Liftoff Test Visual Inspection At least One End Both Ends One End Only BOLU3 CO 10.5 CI 4.5 CO 7.5 i

CM 5.5 CI 11.5 CM 4.5 g)

CI 6.5 CI 2.6 C0 4.5 i

,b C0 6.5 C0 4.6 CI 7.5 CM 7.5 C0 5.6 CI 8.5 CI 10.5 CO 6.6 CI 9.5 All of the above tendons except Tendons 80LU3 and CO 6.6 have no record of previous surveillance since original installation.

Only one(1) of the nineteen (19) supplemental tendons surveilled, CM 7.5, was observed with a non-effective wire.

All supplemental tendons which had a liftoff test possess loads which are well above the minimum design load for each tendon.

2.3 COLLECTIVE TENDON SURVEILLANCE INFORMATION SUMMARIES 2.3.1 Tendons with Non-Effective Wires Table 2.2-1 provides a complete summary of all tendon ends surveilled through June 20, 1986 (the effective surveillance cutoff date for this report), which have been observed with non-effective wires, anc the number of non-effective wires in each. Table 2.2-1 is a revised update of Table 2.3-1 of the January,

1986, tendon surveillance report.

AU

~ _.

~

O, P;93 1 of' 2 IABLE 2.2-1

SUMMARY

Of TENDONS OBSERVED Wi1H NON-EFFECTIVE WIRES Number of New Total Number or Additiona l 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 Su rve i l l a nce Wires Observed Latest Survell-Latest Surveil-EJt m Wires Dale thru 02/26/85 (21.f31 lance Date f41 lance Date

_d Number VM-1 Bottom 169 06/02/86 1(5) 1 O

VI-2 Iop 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

VM-10 Top 169 05/24/86 7

7 0

VM-11 Top 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

VM-29 Top 169 06/21/85 1

1 O

VM-30 iop 169 ti6/16/86 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 06/16/86 1

1 0

VM-42 Top 169 06/03/86 2

2 O

Bitu3 l-11 169 05/15/86 16(8) 18 2(13)

B1LU3 iV-V 169 05/16/86 20 20 0

BIRU3 1-11 169 05/15/86 0

1 1

BILU4 l-11 169 03/15/85 28 28 0

BILU4 IV-V 169 03/15/85 3(9) 3 o

BORU4 IV-V 169 03/15/85 3

3 0

BILL 3 11-111 169 11/12/85 0

1 1

BOLI4 V-VI 169 03/18/85 1

0 0

BORL4 V-VI 169 03/18/85 2

1 0

BOLM3 Ill-IV 169 04/18/86 1

1 0

BILM3 VI-l 169 04/30/86 1

1 0

BOLM4 Ill-IV 169 12/26/85 3

3 0

BORM4 til-IV 169 04/17/86 1

3 2

IIRL2 IV-V 169 02/22/85 1

N/S IORl2 1-11 169 02/19/85 1(10)

N/S TORL2 IV-V 169 02/22/85 1(10)

N/S TOLMI til-IV 169 02/01/85 1

N/S 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 Cl 15.1 1

152 12/03/84 1

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

N/S CO 12.2 IV 152 05/17/85 N/S 1

1 CO 12.2 VI 152 05/06/85 N/S 1

1 CO 16.2 IV 169 06/13/85 N/S 1

1 a7 CM 1.3 V

169 09/21/84 1

N/S ua*

CO 5.3 Ill 152 09/06/85 N/S 1

1 CO 8.3 Ill 152 09/19/85 N/S 3

3 so

- continued next page o

-s

(

\\,j

. \\j P gt 2 cr 2 TABLE 2.2-1 (cont.1

SUMMARY

Of TENDONS OBSERVE D WlIN NON-EFrECTIVE WIRES Number of New.

Total Number or Additional of Non-effective Non-effective Number Totai Number Wi res Observed Wires Observed or latest of Non-effective 02/27/85 thru 02/27/85 thru lendon Tendon Original Surveillance Wi re s Ob se rved Latest Surveil-Latest Surveil-Number End(1)

Wires Date thru 02/26/85 (21.t31 1ance Date f41 Iance Date Cl 10.3 Ill 152 10/02/85 N/S 1

1 CO 16.3 Ill 169 03/22/85 N/S 1

1 CO 16 3 V

169 03/22/85 N/S 1

1 CI 5.4 VI 152 08/16/85 N/S 2

2 CM 6.4 Il 152 08/07/85 N/S 1

1 CM 7.4 Il 152 08/06/85 N/S 1

1 00 9.4 vt 152 07/25/85

.N/S 1

1 CO 2.5 1

169 06/14/84 3

N/S CO 2.5 V

169 06/14/84 16(11)

N/S CM 7.5 V

152 01/24/86 N/S 1

1 CM 9.5 1

152 02/05/86 N/S 1

1 CM 15.5 8

152 11/01/84 1

N/S CM 15.5 V

152 11/01/84 1

N/S CM 4.6 11 169 06/20/86 N/S 20 20 C1 12.6 11 152 12/04/84 1(12)

N/S Cl 12.6 IV 152 12/04/84 1(12)

N/S Cl 14.6 il 152 01/11/85 2(12)

N/S CM 14.6 IV 152 01/07/85 1(12)

N/S CO 17.6 N/R 169 01/75 1

N/S NOTrS lby reference number):

1) Indicated by PCRV buttress number, ir between two buttresses, indicated by both nea rest buttress numbers.

Longitudinal tendons indica ted by " Top" or " Bottom".

"N/R" means end surveilled not repo rted.

2) Reported in Ma rch 18, 1985 Tendon Surveillance Report, except as noted.

3)

"N/S" means that this tendon end was not surveilled before 02/27/85.

4)

"N/S" means that this tendon end has not been surveilled since 02/26/85.

5) Not reported Ma rch, 1985; top end observation (no non-effective wires) was reported.

6) This is a correction; rive (5) non-ef fective wires were reported March, 1985.

7) Not repo rteJ Ma rch, 1985; top end observation only was reported. Number reported here is a correction f rom January, 1986, report.

8) Not reported Ma rch, 1985; End IV-V observation only was reported.

9) Not reported Ma rch, 1985; End 1-18 observation only was reported.

10) This is a correction; no non-ef fective wi res were reported Ma rch, 1985.

o

11) This is a correction; rif teen (15) non-effective wi res were reported Ma rch, 1985.

12) act reported Ma rch. 1985.

y

13) These two (2) additional wires were not observed prior to the January, 1986, Tendon Survei l lance Report.

Q

Page 21 of 26 mQ Since the January report, three additional tendons have been observed with non-effective wires: CM 7.5, CM 9.5 and CM 4.6.

None of the three had been surveilled prior to the January report. Tendon CM 4.6, discovered with an unusual amount of water and twenty (20) non-effective wires on one end in March, 1986, was discussed in Section 2.1.1.2.

Also since the January report, only one tendon, BILU3, was observed with additional non-effective wires (two additional, from 16 total to 18 total) on one end since its next previous surveillance in March, 1985.

Through June 20, 1986, since March 1, 1984, of the total of 896 tendon ends existing on the PCRV, a total of 533 ends have been surveilled.

Of these 533, a total of sixty-one(61) tendon ends, or 11.4 percent, have been observed with one or more non-effective wires. Presented another way, the 533 tendon ends surveilled represent a total of 319 tendens; i.e., 319 of the 448 PCRV tendons have been surveilled on at least one end since March 1,

1984. Of these 319 tendons surveilled, a total of fifty-one(51) tendons, or 16.0 percent, have been observed with non-effective wires--forty-six(46) tendons with seven(7) or less non-effective wires each and only five(5) tendons O

with at least sixteen (16) non-effective wires each.

G' As can be seen in Table 2.2-1, not all of those tendon ends observed with non-effective wi.es prior to February 27, 1985 (the cutoff date for the March,1985, tendon surveillance report), 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 2.2-1 shows that, in general, there continues to be no significant increase in wire breakage in those tendon ends surveilled more than once since increased surveillances began in March, 1984.

With the exception of the special case tendon, CM 4.6, the circumferential tendon group continues to exhibit only isolated cases of tendons with minor wire breakage.

2.3.2 Tendon Surveillance Historical Information The PCRV Tendon Surveillance Plan drawings, showing graphical end

views, with specific historical surveillance information, of all PCRV tendons, have been updated to include all tendon surveillances through June 20, 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

l Page 22 of 26 im provided for each tendon end.

2.3.3 Number and Percentage of Tendons Surveilled 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 liftoff and/or visual surveillances performed on them at least once between March 1,

1984 (the approximate start date of increased tendon surveillances), and June 20, 1986 (the effective surveillance cutoff date for this report). Table 2.2-2 is a revised update of Table 2.3-2 of the January,

1986, tendon surveillance report.

For the table count, no tendon has been counted twice.

All possible end combinations of surveillance types, including non-surveillance, for any one tendon are categorically tabularized. Therefore, the total sum of surveillances (and non-surveillances) shown for each tendon type (each column) equals the total nu,nber of tendons of this type in the PCRV.

As observed in Table 2.2-2, 319 of the total 448 PCRV tendons, or 71.2 percent, have had at least a visual inspection on at least one end at least one time since

(]

March 1, 1984. This is an increas-~ of 6.9 percent of v

total tendons surveilled since the January,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 been surveilled.

2.4 TENDON LOAD CELL SURVEILLANCE J

As committed to the NRC in April,1984 (

Reference:

PSC Letter P-84110, dated April 12,1984),

the twenty-seven (27) tendon load cells are being monitored monthly for signs of excessive relaxation or load loss.

Data has been recorded monthly from May, 1984, through the current month (latest data available for review for this report is June,1986).

A review and discussion of load cell data available through December, 1985, was included in the January, 1986, tendon surveillance report.

From a review of the monthly data from May, 1984, through June, 1986, there are no signs in any of the load-cell tendons of a general trend toward load relaxation or load loss.

Moreover, all load-cell tendons continue to possess a substantial load margin above the minimum G

design load for each respective tendon type.

, - -. ~ - -., - -., - -

.~.%.--,4.-.-.,,3-

-,me-

---

m,..

. - ~ <,. -.... - - -.. - -. - -

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\\j Page 1 of 1 I ABL E 2.2-2 1

i

SUMMARY

Of TENDONS LififD-OffLll AND/OR VISUAL-ONIYL2_1 3

1.!LSPE CT ED AT L EAST ONE TIME BEIWEEN MARCH 1.

1984. AND JUNE 20. 1986 I

TENDON TYPE (31 i

ll l

80110M i IOP li CIRCUMILHJNLI AL I

l IlLONGITUDINAL l CROSSHEAD lCROSSHEAD HEAD l BARREL l TOTALS I

ll 141 l

l l

l 110tal Number Or iendons lhis type (S) l 90 1

24 l

24 l 100 l 210 1

448 l

l l

1 I

l l

l l L i f'to f f, both ends l Number l

N/A 19 l

13 33 l

95 160 l

l I

l l

1 l

i l

l 1% or Totall N/A

!i 79.2 l

$4.2 33.0 45.2 144.7(6) l; l SI l

___l Il i

11 l

1 l

l U ILiftorr, one end I Numtw I

8 l

1 l

9 l

11 1

17 1

46 1

l R IVisual only, other end I.

l l

l l

_,1 l

l l V j 1% of Totall 8.9 l

4.2 l

37.5 11.0 1

8.1 l 10.31 l

j l E I I

l l

l l

l l

l l 8 Itirtori, one end INumber 1

66 l

0 l

2 1

9 1

0 l

71 l l

?

l L INo visual or lif tos f, other end l

l l

1 l

l l

ll 319 l l t i 1% of lotall 73.3 1

0 l

8.3 l

9.0 1

0 1

11.2 l

i l A l l

l l

l l

l l

71.2% l 3

l C l l_

l l

l l

l

.i 8 l l

IN IVisual only, both etc2s l Number l

2 l

0 1

0 l

3 1

3

'I

,l l

1E l 1% or Totall 2.2 ll 0

l 0

1 3.0 l

1.4 1.8l l

l l

1 I

l l

1 l

l l

l Visual only, one end INumber l

N/A 4

0 l

3 l

8 1

15 1 1

I i lNo visual or lif tof f, other end l

l l

i l

l ll l

l IY l 1% of Totall N/A i

16.7 1

0 l

3.0 l

3.8 l 4.216)l l

1 1P I l._

l l

l l

l l

11 l

l E IVisual only, top end INumber i

13 i

N/A N/A l N/A l N/A l

13 I

I l

lNo visual, bottom end 1.

l l

l l

l i

1 l

l% of lotall 14.4 l

M/A ll N/A ll N/A l N/A l14.4(/)l l

l l_

l..

l I

i 1

l l

l l

1 l

l l

1 I

I

,1 41 I

87 l 129 l I

INo lif tof f or visual, either end INumber l

1 l

0 1

0 l

l 1

l l

l% or totall 1.1 1

0 1

0 41.0 l

41.4 l 28.81 l_1 I

I I

l ll l

l I

NOTES:

1) A liftoff includes visual inspection of anchorage assembly and wire bundle; therefore, a lif toff takes precedence over a " visual - only" inspection in the tabulation. No tendons are counted more than once in the tabulation.

21 " Visual - only" means visual inspection of anchorage assembly only; i.e.,

no liftoff performed to inspect wire bundle, j

3) N/A: Not applicable for this tendon type.

7 u3 1

88

4) tongitudinaI tendons can on1y be Iifted off on top end.

a N

$) Most, but not all, tendons are accessible for liftoff and/or visual inspection, ta E

6) longitudinal tendons excluded f rom tota l number of tendcris for this total pe rcen ta ge.

7: inis totai percentage is based on tne number or iongitudinai tendons.

M j

Page 24 of 26

(

3.0 STATUS OF PREPARATIONS TO REMOVE AND REPLACE EXISTING PCRV TENDONS As reported in the January,

1986, tendon report, preparations are under way to remove existing PCRV tendons and replace them with newly-fabricated tendons.

The primary reason for this removal / replacement operation is to make original, grease-covered tendons available for the testing of old grease flushing and replacement grease filling operations.

The purpose of the flushing and replacement grease testing is (1) to identify an effective flushing agent and/or corrosion protection filler grease and (2) to develop the flushing and/or grease-fill techniques which can be used safely and effectively on the PCRV inside the FSV reactor building.

The January report discussed, in Section 3.1.1.2, some work items which were required to be completed prior to the start of the tendon removal / installation operations.

An update on the status of these preliminary work items follows:

1)

Tendon twisting:

Unidirectional twisting of the newly-fabricated tendons has been justified and is acceptable as an alternative to the dual-direction 3

twisting called for in the original FSV tendon (V

fabrication specification.

2)

Tendon wire buttonheads:

The tendon fabrication vendor is still in the process of modifying its buttonheading machine dies to produce buttonheads which comply with the FSV buttonhead specification with regards to configuration, dimensional and strength requirements.

Development buttonhead samples have been dimensionally inspected and strength tested and do not at this time meet the strength requirement.

3) Tendon procedures: Procedures have been developed by the vendor for tendon fabrication, quality control during fabrication, tendon removal / installation and tendon anchorhead proof testing. A major review was performed on the original draft of these procedures for compliance with FSV specifications.

Numerous revisions to the drafts were required. The revised drafts are now being reviewed again.

New anchorhead machining and heat treating procedures have been completed and implemented.

A tendon tube cleaning and leak testing procedure still requires investigation and development.

b 4)

Tendon anchorheads:

New anchorhead outer bushings have been machined. All new anchorhead parts (washers

Page 25 of 26 pd and bushings) have been heat treated per specification requirements.

Mechanical proof testing of the new anchorheads will be performed by the tendon fabrication vendor. The new anchorheads are to be used with the new replacement tendons as required.

5)

Tendon wire relaxation:

1000-hour stress relaxation tests at 120 degrees-F have been completed on the heats of wire to be utilized for new-tendon fabrication. The relaxation results demonstrate that the relaxation properties of the wire are in compliance with the FSV specification criterion.

6)

A Change Notice will be required prior to tendon fabrication to justify any deviations from FSV fabrication specifications.

7) Tendon fabrication can begin once Items (2), (3), (4) and (6) above have been fully resolved and completed.

8)

The development of an approved Controlled Work Procedure will be required prior to the start of the tendon removal / replacement operations.

Work is continuing towards completion of the above preparations for tendon removal / replacement.

I I

I

}

l

.lO 1

i.

i-I Page 26 of 26

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i 1

l-APPENDIX A

.j-4 l

PCRV TENDON SURVEILLANCE PLAN ORAWINGS i

Drawing Number Tendon Type l

j 1A Longitudinal IB Circumferential Layers 2, 5 and 4 1C Circumferential 3

Layers 1, 6 and 3 i

1D Top Crosshead Bottom Crosshead 4

!O 4

i i

I l

l I

t r

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4 ik,.---_,..____

i OVERSIZE DOCUMENT PAGE PULLED SEE APERTURE CARDS NUMBER OF PAGES:

ACCESSION NUMBER (S):

% 6799-0 V6%

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l V67 p69 l

l l

l APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH,TIDC FTS 492-3939 l

l l

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_., _, _. -. _. _ _ _, _. _ _ _ - _ _ _. _ _