Text

Pcrv Tendon Interim Surveillance Rept
	ML20235W609
Person / Time
Site:	Fort Saint Vrain
Issue date:	07/31/1987
From:	; PUBLIC SERVICE CO. OF COLORADO
To:	;
Shared Package
ML20235W591	List: ML20235W589; ML20235W609; ML20266J571; ML20266J576; ML20266J578; ML20266J584;
References
	NUDOCS 8707230618
	Download: ML20235W609 (31)
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l.

O' PCRV TENDON INTERIM SURVEILLANCE REPORT July, 1987 Fort St. Vrain Nuclear Generating Station Public Service Company of Colorado l

O i

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870723061e 070720 i

PDR ADOCK 05000267 R

PDR

1 ABSTRACT O

V This report is the fourth consecutive semiannual report to be i

submitted under the current requirements of the interim surveillance i

program established to monitor corrosion in the Prestressed Concrete Reactor Vessel (PCRV) nrestressing 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.

i

Also, the findings of the second semiannual visual surveillance on the worst-case tendon group are reported.

Included in the worst-case tendon section of this report is a discussion of Tendon CM 4.6, in j

which an unusually large quantity of water was discovered in March, 1986.

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

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

i l

Based on the control tendon program results to date, the rate of j

p corrosion in the tendon system is extremely low or nonexistent

()

and of no immediate concern.

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

Based upon a lack of noneffective wires or G e lack of an increase in noneffective wires, there is no indication that corrosion is continuing in any of the 32 previously-surveilled "new" tendons.

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

l Based on the latest available liftoff loads, each of the worst-l case tendons provides effective prestress for the PCRV with the measured load for each tendon above minimum design load.

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

This is a significant and favorable sign with regard to all other lesser-corroded PCRV tendons.

O C/

Approximately 3.4 quarts of water /cil mixture was collected from the end caps of the special-case Tendon CM 4.6.

Eeing investigated is the addition of a traceable ingredient to System

46 liner cooling water which may allow positive. identification or 7

elimination'of System 46 as the source of water in Tendon CM 4.6.

l0f 313 total. tendons liftoff tested on at least one end since March 1,-1984, representing 69.9 percent of all.448 PCRV tendons, I

all possess load significantly above the minimum required load

)~

for each tendon type.

To date, 346 of the total 448 PCRV tendons,'or 77.2 percent, have had a visual inspection on at least one end at-least one time since MLrch 1, 1984. Of these 346 tendons, 141 tendons have had a visual inspection on at least one end two or more times.

Of the 346 tendons surveilled since March 1, 1984, a tctal of 58, or 16.8 percent, have been observed with noneffective wires.

Thest 58 tendons include 53 tendons with only 7 or 'less noneffective wires each and only 5 tendons with at least 16 noneffective wires each.

No tendon surveilled to date (including the 5 worst-case tendons) posesses a number of noneffective wires above the maximum allowable number which would trigger a specific engineering evaluation.

Of the total of 58 tendons observed with noneffective wires, only 12 tendons have shown'an increase in noneffective wires between the first' and latest surveillance dates for each tendon.

It is PSC's conclusion that a significant-contribution to these increases in noneffective wires is attributed to the increased stress induced during a liftoff and/or retensioning of the p:

d tendons, and not due directly to corrosion alone.

Based on this conclusion, the increases in noneffective wires in these 12 tendons are therefore insignificant with regard to corrosion rate concerns.

Based upon (a) the lack of any increase in noneffective wires d_ue directly to corrosion alone since the first surveillance date (March 17 1984, or after) for each of the 12 tendons showing an increase (as concluded above), (b) no increase in noneffective

wires, as of the latest surveillance date, in each of the remaining 46 tendons observed with noneffective wires, and (c) zero noneffective wires, as of the latest surveillance date, in each of the remaining 288 tendons with at least one surveillance since March 1, 1984, evidence continues to strongly suggest that corrosion is not continuing at any significant rate, if at all, in a very high percentage (97 percent or better) of all PCRV tendons.

From monthly tendon load cell data, there continue to be no signs in any of the load-cell tendons of a general trend toward any significant load relaxation or load loss.

Tendon surveillance results continue to demonstrate that, left in their present condition, every PCRV tendon will likely maintain design effectiveness, i.e.,

the capability of sustaining load above the minimum required load, for many years to come.

i i

U l

CONTENTS

1.0 INTRODUCTION

1 2.0 PCRV TENDON SUP.VEILLANCE INFORMATION.............

1 I

2.1 FINDINGS OF THE FOURTH SIX-MONTH INTERIM SURVEILLANCE PROGRAM PERIOD,..........

1 I

2.1.1 Vi sual Inspection.................

2 1

2.1.1.1 Control Tendons.............

2 2.1.1.2 New Tendons.

7 2.1.2 Liftoff Testing.................

11 2.1.2.1 Control Tendons.............

11 2.1.2.2 New Tendons...............

12 2.2 WORST-CASE TENDON SURVEILLANCE...........

12 2.2.1 Tendon CM 4.6..................

15 2.3 SUPPLEMENTAL TENDON SURVEILLANCE 1S 2.4 COLLECTIVE TENDON SURVEILLANCE INFORMATION SUMMARIES..

18 2.4.1 Tendons with Noneffective Wires.........

18 2.4.2 Tendon Surveillance Historical Information....

22 2.4.3 Number and Percentage of Tendons Surveilled to Date....

22 2.4.4 Conclusions.........

25 2.5 TENDON LOAD CELL SURVEILLANCE,....

.26 APPENDIX A:

PCRV TENDON SURVEILLANCE PLAN DRAWINGS...

.27 C(

L Page 1 of 27-

1.0 INTRODUCTION

l'

.This report is being submitted to comply' with. the requirements of the interim surveillance program which has l

been set up to monitor corrosion in the Prestressed Concrete Reactor Vessel (PCRV) prestressing.tencons (

Reference:

P-85071, dated March 5, 1985).

This is the fourth consecutive.

semiannual report to be submitted under.this program; the-

first, second and third six-month reports were submitted under letters P-86042 (January 22, 1986), P-86463 (July 18, 1986) and P-87021 (January. 19, 1987), respectively. As explained in the January,1986, report, the effective start date for,the interim surveillance program was established as July 21, 1985, with the findings of the tendon surveillance performed during each six-month interval to be reported at the end of each period.

The present report therefore reports the fin' dings of tendon-surveillance performed since the January,

1987, report; more specifically, the actual tendon surveillance included in this report were perfor:ned between January 21 and May 31, 1987.

In addition to the control and new tendon groups as part of the interim surveillance program, this report, also covers the findings of the second semiannual visual' surveillance performed on the five(5) worst-case tendons as established

.A in the Attachment (Pages 10 and 11) to Letter P-86491, dated

.V.

July 29, 1986.

A discussion of Tendon CM 4.6, in.which an unusually large quantity of water was discovered in March, 1986, is included in the worst-case tendon section of this report.

2.0 PCRV TENDON SURVEILLANCE I.NFORMATION 2.1 FINDINGS OF THE FOURTH SIX-MONTH INTERIM SURVEILLANCE PROGRAM PERIOD The PCRV tendon interim surveillance program scope, definitions and requirements were discussed in detail in Section 2.1 of the January, 1986, report (P-86042). The findings of the surveillance performed during the fourth six-month interim surveillance period are reported here.

For ease of comparison and cohesiveness from report to

report, the tabular, graphical, text and organizational format of findings continue to appear in the same manner in this report as in the earlier reports, with the exception of Table 2,4-1 for which the manr.er of presentation of the tendons observed with noneffective wires has been revised to better represent changes in numbers of noneffective wires with time.

A discussion of Table 2.4-1 is included in Section 2.4.1.

I l-Page 2 of 27 j

2.1.1 Visual Inspection 2.1.1.1 Control: Tendons The control' tendon group for_ visual inspection is that group.

f of, tendons which, once selected, remains the same for each l

semiannual.' visual inspection period. The tendons chosen as

{

control tendons for visual inspection,. selected 'during the first-six-month interim surveillance period and initially.

presented in the January,1986, report, are as follows:

' Top

. Bottom Circumferential Crosshead Crosshead Longitudinal CM 1.1-TIRM2 BIRM4 VM-10 VM-37 C0 14.4 BILM3 VI-20 VI-40 1

CM 16.3 VM-20 VM-40 i

A complete historical surveillance information summary, including the findings during this fourth 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, rep _ ort (P-86042) remains applicable.

Based h().

that no new noneffective wires have been observed in any of on the line of reasoning from this discussion and referring to the findings reported in Table 2.1-1, it is again noted the-control tendons during this latest (fourth) semiannual surveillance period as compared with previous surveillance.

In fact, no new noneffective wires have been observed in any

(

of the twelve (12) control tendons since the start of the I

interim surveillance program in June, 1985.

l The reported observance of discoloration on certain tendon parts is of little or no c.oncern as this discoloration is superficial, surface corrosion having insignificant effect on the overall structural strength and integrity of the part

involved, nor is it likely to endanger the future strength or_ integrity of that part.

Observance of discoloration is subjective in nature and of little value in judging the extent or rate of degradation of a tendon.

Tendon degradation is more reliably monitored by observance of any increase in the number of noneffective wires.

Based on the control tendon program resu7ts to date, the rate of corrosion in the tendon system is extremely low or nonexistent and of no immediate concern.

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2.1.' 1. 2 New Tendons t

The new ten' dons selected for visual.' inspection for this fourth six-month interim surveillance period are as follows:

Top Bottom Circumferential Crosshead Crosshead Longitudinal C1 11.3 TIRL2 BILL 3 VM-3 VI-15 CM 11.3 BOLL 3 VM-4 VM-16 CO 11.3 BOLU3 VI-6 VI-21 CI 12.3 BILM4 VM-6 VM-21 CM 12.3 BOLU4 VI-7 V0-21 C0 12.3 BIRU4 VM-7 VI-22 CO 14.3 VO-7 VM-23 CI 15.4 VI-8' VI-24 CM 15.4 VM-8 VI-27 C0 15.4 VI-9 VM-39 CI 16.4 VM-9 VI-41 CM 16.4 VM-13 V0-42 CO 16.4 A summary of the latest surveillance information gathered during this fourth six-month interim visual-surveillance period for each end of each new tendon is presented in Table 2.1-2. -Those tendon ends receiving their first surveillance since ~ original installation in 1970 are noted in the table.

Many of the new tendons were observed with a discoloration of the anchorhead (washer) or wires, which, as indicated earlier, represents only surface corrosion having negligible effect on overall structural integrity.

Three(3) of the forty-1:.e(45) new-tendon ends with a liftoff were observed with scaling on some of the~ wires; however, this is not an

. unusual ratio in initially-surveilled circumferential tendons compared to previous reports.

One(1) of these three(3) tendon. ends was observed with one(1) noneffective wire, while the other two(2) ends had none.

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

circumferential:

three(3) out of thirteen (13) new circumferential; top crosshead: one(1) out of one(1); bottom crosshead:

one(1) out of six(6); and longitudinal: one(1) out of twenty-four(24).

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

Out of the total of forty-four(44) new tendons for visual inspection, thirty-two(32) have had at least one previous surveillance on at least one end since March, 1984 (the date of discovery of the tendon corrosion problems).

Based upon a lack of noneffective wires or the lack of an increase in noneffective wires, there is no indication that corrosion is L

continuing in any of these thirty-two(32) previously-surveilled new tendons.

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Page 11 of 27 Of the twelve (12) remaining 'new tendons for visual

.I inspection with no previous surveillance record on either end, all of which are circumferential tendons, three(3) were observed with noneffective fwire(s): Tendon CO 15.4 with one(1) noneffective wire on each end, and Tendons CM 11.3 and CM 16.4,-each with one(1) noneffective wire on one end only.

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

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

The observations of the latest new-tendon group also continue to show that the circumferential tendons have been subjected to some corrosion, but not to the extent or degree of severity l

observed previously for the bottom crosshead and longitudinal tendons.

2.1.2

Liftoff Testing 2.1.2.1 Control Tendons The control tendon group for liftoff testing is that group of tendons which, once selected, remains constant in identity and quantity during each six-month period of the r-g-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 initially presented in the January,1986, report.

These liftoff control tendons are as follows:

Top Bottom Circumferential Crosshead Crosshead Longitudinal CM l'.1 TIRM2 BIRM4 VM-10 CO 14.4 (load cell)

VI-20 CM 16.3 VM-40 l

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 Tenden BIRM4 was 1250 kips, which compares very favorably with the three previous readings of 1253 kips,1264 kips and 1257 kips.

The tendon liftoff loads measured to date for the control tendons, in all cases, continue to be well above the minimum desion loads for. each tendon type as reported earlier in Letter P-84135, dated May 7, 1984.

Moreover, the measured liftoff loads do not exhibit any trend towards significant load relaxation or load loss.

The differences in measured liftoff load values noted for each control tendon from one 1

l

Page 12 of 27 liftoff to 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 ahead of.the committed schedule in the tendon surveillance report submitted under Letter P-86463, dated July 18, 1986.

Under the. current program, the new tendons for liftoff testing for the second 18-month interim surveillance period, covering January 21,

1987, to July 21, 1988, will be selected at a later date, with the report of the liftoff surveillance findings due July 21, 1988.

2.2 WORST-CASE TENDON SURVEILLANCE As indicated in Section 1.0, this repart also covers the findings of the second semiannual visual inspections performed on the tendons from the worst-case tendon group.

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

Worst-Case Tendons 1

CD 2.5 l

CM 4.6 BILU3 BILU4 VM-30 l

l A.

complete historical surveillance information summary including the findings during this second semiannual period l

for each end of each worst-case tendon is presented in Table 2.2-1.

Based on the latest available measured liftoff loads, each of the worst-case tendons provides effective prestress for the PCRV.

(These tendons are not liftoff tested semiannually since exercising degraded tendons may have the undesirable effect of causing unnecessary further degradation of the tendons.)

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.

The number of noneffective wires has not increased in any of the worst-case tendons relative to the numbers reported in the January,

1987, surveillance report (P-87021) for the first semiannual worst-case tendon surveillance period.

Section 2.4.1 of this report discusses the increases in

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noneffective wire numbers which occurred during earlier surve_illances as shown in Table 2.2-1.

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l Page 15 of 27 Based upon a lack of increase in noneffective wires in the worst-case. tendons over a ' period of at least two years

!]n (except Tendon CM 4.6, first surveilled in March, 1986), it is evident that the rate of corrosion has subsided-to a very low level in.these tendons.

This continues to be a significant and favorable sign with -respect to all other PCRV. tendons which currently exist in a substantially lesser-corroded state.

U.2.1 Tendon CM 4.6 With respect to 'NRC concerns about Tendon CM 4.6'(NRC letter, Heitner to Williams, dated March 25, 1987 (G-87105)),

a _ full chronological summary of events, current status and future planned action for the tendon is provided here.

Most of the information provided here' is a reiteration of information previously provided in earlier submittals: P-86394, P-86463, P-86491 and P-87021.

l Approximate Date Event March 13, 1986 During the course of normal tendon surveillance as part of the interim. surveillance program, Tendon CM.

4.6 was opened for inspection.

This.was the first

-surveillance since original installation in 1970.

A total of approximately 28 gallons of water was drained from both ends.

As indicated by raised buttonheads, there were no noneffective wires in End IV and twenty (20) noneffective wires in End II. All noneffective wires from End II, varying in length from 5 inches to 9-1/2 feet, were removed.

After cleaning of the anchorheads on both ends, it was apparent that both were in very good condition, with some surface _ corrosion especially at the water line about 2/3 up on the anchorheads.

A major "as-found" discovery at End II was that the 1/2-inch-diameter 0-ring on the end cap, intended to provice a seal from exterior elements, was permanently deformed for a span of approximately 2 inches near the top of the 0-ring circumference.

This breach in the 0-ring seal left a gap open to atmosphere of approximately 1-1/2 inches long by 1/2 inch wide.

Adjacent tendons were opened for inspection with no water, noneffective wires or corrosion observed.

March 13-19, 1986 Water was allowed to completely gravity-drain until i

all dripping ceased.

Page 16 of 27 March 19, 1986 A ncnconformance report was initiated on the tendon with respect to the finding of an unusual amount of water.

March 31, 1986 The nonconformance report was dispositioned specifying a magnetic particle inspection of the End II anchornead followed by a liftoff on End II.

(End IV is not accessible for liftoff due to interference from System 46 liner cooling supply / return tubes.)

April 7, 1986 A fluorescent magnetic particle inspection was performed on the End II anchorhead with "no relevant indications" found.

A liftoff test was performed on End II with a resultant tendon load of 1235 kips being measured (minimum design load is 765 kips for this tendon type (

Reference:

Letter P-84135)). The inspection of the wire bundle showed scaling on most of the visually-accessible wires.

No additional wires failed during liftoff.

April 8, 1986 The damaged 0-ring on the tendon cap, End II, was replaced and the cap reinstalled.

Water Chemistry completed a report on analys h of O

water samples from Tendon CM 4.6.

The conclusion V

was that positive identification of the source was not possible.

April 15, 1986 The end cap was again removed from End II.

No additional water or noneffective wires were found.

June 16, 1986 A

voluntary Licensee Event Report (LER) was submitted reporting the fi ndi r.g s and corrective action taken on Tendon CM 4.6 (LER No. 84-005-04 submitted under Letter P-86394). Corrective action included the replacement of the breached 0-ring and future monitoring of the tendon for additional water collection and/or noneffective wires.

June 20, 1986 A

visual inspection of Ends II and I '/ was performed.

No additional noneffective wires were found and approximately 2.0 cuarts of water was collected, believed to have been a result of evaporation of water from the interior interstices of the tendon bundle and low spots in the tendon tube, followed by a recondensation of this water in tne cooler end caps.

Fcilowing inspection the caps were reinstalled.

July 18, 1986 The July, 1986, tendon surveillance report was O

submitted (P-86463) reporting the findings on Tendon CM 4.6.

Page 17 of 27 July 29, 1986 PSC submitted responses. (P-86491) to NRC tendon-related questions (NRC letter, Hinson.to Walker, dated June 12,.1986 (G-86314)).

Included in-these V

responses was a new commitment by PSC to establish

a group of " worst-case" tendons to be visually inspected on'a semiannual. basis.

Tendon CM 4.6 was included as part of this group..The semiannual period established coincides with the current interim surveillance program schedule. Therefore, Tendon CM 4.6 ~ is now inspected at a formal semiannual frequency.

Nov. 14-15, 1986 Both ends of Tendon CM 4.6 were visually inspected.

Approximately 1/2 quart of water was collected. No additional noneffective wires were found.

Nov. 26, 1986_

A Water' Chemistry lab report was received on the water sample taken Nov. 15. The report indicated that, based on pH, the water was not believed to be System 46 liner cooling water..

January 19,.1987 The January, 1987, tendon surveillance report was submitted (P-87021) reporting the findings on Tendon CM 4.6 over the previous six months.

May 27, 1987 Both ends of Tendon CM 4.6 were opened for. visual inspection. No nor. effective wires in addition to the original twenty (20) were found. ' Approximately 3.4 quarts of water / oil mixture was collected. The sample was forwarded to Water Chemistry.

It has been considered highly unlikely that the source of water being found-in Tendon CM 4.6 is internal to the PCRV 4

in 'the form' of System 46 liner cooling water (the only possible internal source).

It has been postulated that the most' likely source of.the water was external to the'PCRV, having made its way into the tendon cavity through the breach in the 0-ring seal discovered in the end cap.

It has also been believed that the acJitional water collected during subsequent surveillance is a result of evaporation from the tendon internals and recondensation in the end caps.

External sources of water which could have entered through the breached 0-ring include rain and/or snow-melt. du ing original' construction prior to placement of the reactor building, wash water used to clean the PCRV during plant construction following tendon installation and during any subsequent cleaning jobs, and reported large quantities of water allowed to flow (cascade) over and down the sides of the PCRV from the top head at various times within the last ten years (all of these sources are very difficult, if not impossible, to confirm).

i The. latest finding of approximately 3.4 quarts of water / oil mixture was more than expected considering the downward

Page 18 of 27 1

trend which was occurring up to and reported in the January, 1987, tendon report (P-87021).

,.I

~

Although; it.is still considered that the most likely source of the water in Tendon CM 4.6 was exterior to' the PCRV entering by way of the breached 0-ring, Water Chemistry is investigating the possibility of adding a

traceable L

ingredient to ' System 46 which may allow. positive identification or elimination of System 46 as the source.

The intent is to add a fluorescein dye to System 46 which would be- _ detectable by ultraviolet (U.V.)

visible spectrophotometry.

Baseline analytical data would be obtained'on the water sample collected during the latest May 27 -surveillance' to make sure that no elements or compounds at the frequency of the fluorescein dye currently exist in the water sample,in order to verify that this technique will provide the posithe identification desired.

Future water samples collected from the tendon during subsequent surveillance (if such samples become available) would then be analyzed for existence of this dye.

Results would be reported in future ' tendon report submittals.

Before the dye can be used in System 46, it must be tested-in the lab for any possible negative effects of the dye on the _ system or the system on the dye.

If it should unexpectedly turn out that the dye is not acceptable for

use, then_

some other traceable ingredient will be I

investigated for use.

l In any event, _PSC will proceed with the addition of a l

suitable traceable ingredient to System 46 as soon as one is identified.

2.3

. SUPPLEMENTAL TENDON SURVEILLANCE Due to extensive maintenance activities over the past six months on other plant systens, time did not allow for surveillance of any a c'di t'. on al tendons not previously surveilled in PSC's continuing effort to complete at least one surveillance on all accessible PCRV tendons.

2.4 COLLECTIVE TENDON SURVEILLANCE 7 FORMATION SUMMARIES l

2.4.1 Tendons with Noneffective Wires Table 2.4-1 provides a complete summary of all tendon ends surveilled through May 31, 1987 (the effective surveillance cutoff date for this report), which have been observed with noneffective wires, and the number of noneffective wires in each.

Table 2.4-1 is similar to Table 2.4-1 of the January, 1987, tendon surveillance report (P-87021); however, t-he manner of presentation of the tendons observed with noneffective wires has been revised to better represent Q

changes in numbers of noneffective wires with time.

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Page 21 of 27 The revised Table 2.4-1 in this report provides for each n

tendon end (a) the "as-found" number of noneffective wires

!Q observed during the first surveillance of that tendon end on or after March 1,1984 (the date of discovery of the tendon corrosion problems),

(b) the number of noneffective wires observed during the latest surveillance and (c) the total number of new or additional noneffective wires observed

)

since the first surveillance date, i.e.,

the difference between the Item (b) and (a) numbers.

Since the January,1987, report, three(3) additional tendons have been observec with noneffective wire (s):

Tendon CO 15.4 with one(1) noneffective wire on each end, and Tendons CM 11.3 and CM 16.4, each with one(1) noneffective wire on

{

one end only.

None of these three tendons had a cocumented j

surveillance prior to the January report since original installation in 1970.

As stated previously in Section 2.1.1.2, the number of noneffective wires found in these circumferential tendons is not out of line with noneffective wire numbers found previously in other circumferential tendons.

Eleven (11) tendons previously surveilled with noneffective wires prior to the January, 1987, report were resurveilled within the past six months; of these eleven tendons, none were observed with an increase in the number of noneffective wires.

To date, 346 of the 448 total PCRV tendons have been surveilled on at least one end since March 1,

1984.

Of these 346 tendons surveilled, a total of fifty-eight(58) tendons, or 16.8 percent, have been observed with one or more noneffective wires.

These 58 tendons include fifty-three(53) tendons with seven(7) or less noneffective wires each and only five(5) tendons with at least sixteen (16) noneffective wires each (these are the five worst-case tendons reported on in Section 2.2 of this report). With the exception of two worst-case tendons, C0 2.5 and CM 4.6, the circumferential tendon group continues to exhibit only isolated cases of tendons with minor wire noneffectiveness.

Many, if not all, of the increases in noneffective wire numbers between the first and latest surveillance dates shown in Table 2.4-1 for some of the tendon ends are believed not to be due directly (and in some cases, not at all) to corrosion alone.

It is believed that, where not directly attributable to documented test wire removal, these increases in noneffective wire numbers are a result of impetus provided to degraded wires during a liftoff and/or retensioning of the tendon.

?

Page 22 of 27 Table 2.4-2 is an attempt to fully account for the increase o

in noneffective wires between the first and latest 4

surveillance dates for each tendon end.

The reasons given for each increase are based on a detailed review of historic surveillance records; however, in some cases the reason given is only a probable-reason in that some of the earlier surveillance records do not provide complete and thorough information with regard to wire failure. The last column of Table 2.4-2 indicates whether the reason given is fully documented or probable based on deduction from available surveillance information.

2.4.2 Tendor Surveillance Historical Information The PCRV Tendon Surveillance Plan drawings, showing graphical end views, with specific historical surveillance information, of all PCRV tendon ends,have been updated to include all tendon surveillance through May 31, 1987.

These updated drawings, Numbers IA 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 2.4-3 provides a complete summary of the number and percentage of tendons of each type which have had a given D

combination of liftoff and/or visual surveillance performed on them at least one time between March 1,

1984 (the approximate start date of increased tendon surveillance),

and May 31, 1987 (the effective surveillance cutoff date for this report).

Table 2.4-3 is a revised update of Table 2.4-2 of the January 1987, tendon surveillance report (P-87021).

For the table count, no tendon has been counted more than once. All possible end combinations of surveillance types, including no surveillance, for any one tendon are categorically tabularized.

Therefore, the total sum of surveillance (and no surveillance) shown for each tendon type (each column) equals the total number of tendons of this type in the PCRV.

As observed in Table 2.4-3, 346 of the total 448 PCRV 1

tendons, or 77.2 percent, have had at least a visual I

inspection on at least one end at least one time since March j

1, 1984. This is an increase of 3.6 percent in total tendons surveilled since the

January, 1987, tendon surveillance report. Of the 346 tendons with at least one O

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Page 25 of 27 surveillance, 141 tendons have had at least a visual inspection on at least one end two or more times (this

(,,)

information is not reflected in Table 2.4-3).

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

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

Of the 313 total tendons liftoff tested on at least one end since March 1,

1984 (from Table 2.4-3),

representing 69.9 percent of all 448 PCRV tendons, all possess load significantly (at least thirteen (13) percent) above the minimum required load for each tendon type per GA Document No. 907441, "FSV-PCRV Tenon Evaluation",

submitted to the NRC as an enclosure to Letter P-86491, dated July 29, 1986.

Of the 346 total tendons surveilled (visual or liftoff) on at least one end since March 1,

1984 (from Table 2.4-3),

which represents 77.2 percent of all 448 PCAV tendons, none possess a number of noneffective wires p

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-eight(58) tendons observed to date with noneffective wires (from Table 2.4-1), fif ty-three(53) tendons exist with only seven(7) or less noneffective wires each, and only five(5) tendons possess at least sixteen (16) noneffective wires each.

Out of the total of fifty-eight(58) tendons observed with noneffective wires, only twelve (12) tendons (including sixteen (16) tendon ends) have shown an increase in noneffective wires during the period from the first surveillance date (June, 1984, or earlier) to the latest surveillance date (December,1985, or later)

(from Table 2.4-1.)

Moreover, based on the probable and dccumented reasons given in Table 2.4-2 for the increases in noneffective wires in these twelve tendons, to date there have been no increases in noneffective wires for any probable or fully-documented reason for at least thirty-two(32) months in any of these twelve tendons.

Additionally, as shown in Table 2.4-2, out of the O

twenty-three(23) instances of an increase in k

noneffective wires (one date = one instance) in the sixteen (16) tendon ends (representing twelve (12) tendons), sixteen (16) of the instances are a documented

Page 26 of 27 case of the noneffective-wire increase being due to either test wire removal or the impetus provided to O'

degraded-wtces by a

liftoff test or

. tendon reter. stoning.

For the remaining seven(7) instances of noneffective-wire increases, it is PSC's conclusion that every one is probably due to the impetus provided to degraded wires by

a. liftoff test or tendon retensiorinc.

Based on.the above conclusions, the increases in noneffective 4 wires in these twelve

. tendons are insignificant with regard to corrosion rate concerns.

Based upon (a) the lack of any increase in noneffective wires due directly to corrosion alone since 'the first surveillance date (March 1, 1984, or after) for each of i

the twe'ive tendons showing an increase- (as concluded above),

(b) no increase in noneffective wires, as of the latest surveillance date, in each of the remaining 46 tendons observed with noneffective wires,- and (c) zero noneffective wires, as of the latest surveillance

'date, in 'each of the remaining 288 tendons with at least one surveillance since March 1,

1984, evidence continues to strongly suggest that corrosion is not continuing at any significant rate, if at all, in a very high. percentage (97 percent or better) of all PCRV tendons.

Tendon surveillance results continue to demonstrate that, left in their present condition, every PCRV tendon will likely maintain design effectiveness, i.e., the capability of sustaining load above the minimum required load, for many years to come.

2.5 TENDON LOAD CELL SURVEILLANCE As committed to the NRC in April, 1984 (Letter P-84110, dated April 12, 1984),

the twenty-seven(27) tendon load cells are being monitored on a monthly basis 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, 1987).

A review and discussion of load cell data available through

June, 1986, was included in the July,

1986, tendon surveillance report (P-86463).

From a review of the monthly data from May, 1984, through June 1987, there are no signs in any -of the load-cell tendons of a general trend toward any significant -load relaxation or load loss. Moreover, all load-cell tendons continue to possess a substantial load margin above the minimum design load for each respective tendon type.

()

Page 27 of 27 l

APPENDIX A

?CRV TENDON SURVEILLANCE PLAN DRAWINGS Drawing Number Tendon Type 1A Longitudinal 18 Circumferential Layers 2, 5 and 4 1C Circumferential Layers 1, 6 and 3 N

10 Top Crosshead Bottom Crosshead l

4 1

I 1

]

Qes l

i

OVERSIZE DOCUMENT PAGE PULLED SEE APERTURE CARDS NUMBER OF OVERSIZE PAGES FILMED ON APERTURE CARDS APERTURE CARD /HARD COPY AVAILABLE FROM RECORD SERVICES BRANCH,TIDC FTS 492-8989

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