ML20141D972
| ML20141D972 | |
| Person / Time | |
|---|---|
| Site: | Farley  |
| Issue date: | 05/13/1997 |
| From: | WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP. |
| To: | |
| Shared Package | |
| ML20141D970 | List: |
| References | |
| NUDOCS 9705200253 | |
| Download: ML20141D972 (15) | |
Text
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I I
J.M. Farley Unit 1 Alternate Plugging Criteria Return to Power Report a
May 1997 Westinghouse Eledde Corporatim Nudear Services Divisim Ma<Haan, PA 15663 9705200253 970513 PDR ADOCK 05000348:
O PDR 1
J.M. Farley Unit 1 Altemate Plugging Cdteria Return to Ptmer Repad I
1.0 (ntmdudian This report provides the J.M. Farley Unit 1 steam generator tube Eddy Current (EC) inspection results at the end of Cycle 14 together with Steam Line Break (SLB) leak rate and tube burst probability analysis results calculated using the measured voltage data, to implement a 2.0 volt Alternate Plugging Criteria (APC). The results based on the actual measured EOC-14 voltage distributions are compared with the projected indication distributions based on the EOC-10 data. Preliminary (pending final repair list) projected EOC-15 SLB leak rate and burst probability are also included in this report. The methodology used in these evaluations is in accordance with previously submitted Westinghouse methodology report (Reference 1).
t l 2.0 S====ry and Condusions l
SLB leak rate and tube burst probability analyses were performed for all three steam generators (SG) based on their actual wasured EOC-14 voltage distributions and the results compared with the projections performed during the last cutage. The total number of indications found at tube support plates (TSPs) during the current inspections are significantly less than those projected at the beginning of the cycle ]
using a POD of 0.6. Actual peak voltages, and leakage rates and tube burst j probabilities calculated using the actual measured voltages are also lower than l projected, except for peak voltage and tube burst probability for SG-C as described l beloW.
I For the actual EOC-14 bobbin voltage distributions, the largest SLB laak rate is calculated for SG-C and its magnitude is 7.6 gpm; the correspondin i burst probability is 5.2x10'8 These values are lower than the allowable Cycle 14 SLB leakage limit of 11.4 gpm and the NRC reporting guideline of 10 8 for the conditional tube burst probability. However, the burst probability is modestly higher than that projected and the difference is caused by detection of a 13.7 volts indication which is significantly above the predicted peak voltage (7.6 volts).
SLB leak rate and tube probability projections were also performed for EOC-15 conditions, and all results except for SG-C leak rate are within the allowable limits.
Based on NRC mandated constant POD of 0.6, the EOC-15 SLB leak rate for SG-C is projected to be 15.4 gpm, which exceeds the current licensed limit of 11.4 gpm.
q:\ ape \ala97\ report \ cycle 14.rty Monday. May 5,1997,16.08 pm l
..j
However, a license amendment to revise the acceptable SLB leakage limit to 19 gpm "i s pending and it envelopes the projected leak rate. The limiting i arst probability, also ca!culated for SG-C, is 9.6x10 ' which is below the 10 8 allowable limit. If a voltage-dependent POD based on POPCD is applied, the SLB burst probability is
- reduced to 4.4x10 8 and the leak rate is reduced to 9.6 gpm which is within the
- current limit of 11.4 gpm.
J A total of 3075 indications were found in the EOC-14 inspection of which 564 were '
2 inspected with a Rotating Pancake Coil (RPC) probe (including a minimum of 20 % ,
of hot leg indications between 1 and 2 volts and all hot leg indications above 2 volts r in SGs A and B and above 1.5 volts in SG-C), and 402 were confirmed as flaws. The RPC confirmed indications included 271 above 1.0 volt. The largest number of bobbin ,
indications,1140 indications, were found in SG-C, 319 of those were inspected by ,
RPC, and 208 were confirmed as flaws. One hundred and seven indications were f found above 2 volts in all SGs combined, of which 46 occurred in SG-C, and 34 of ,
them were confirmed by RPC. No volumetric-type RPC signals were found. !
A large number of tubes in SGs A and C previously plugged in accordance with prior repair criteria were deplugged, inspected and repaired in accordance with APC by
- . installing sleeves or replugged. No deplugged tubes were returned to service in SG-B.
Only 7 indications, all below the APC repair limit, were left unrepaired in tubes +
returned to service in SGs A and C.
The tube with the largest indication found in the current inspections (13.7 volta, R2C85 in SG-C) is scheduled for removal and detailed examination.
3.0 EOC 14 Inspedian Results and Voltage Growth Rates >
, 3.1 EOC 14 Inspedion Results In accordance with the APC guidance provided by the NRC Generic Letter 95-05 (Reference 1), the end of Cycle 14 inspection of the Farley Unit 1 steam generators -
i (SG) consisted of a complete,100% EC bobbin probe, full length examination of the tube bundles in all three SGs. A 0.720 inch diameter probe was used for all hot and cold leg TSPs where APC was applied. Subsequently, RPC examination was performed for a minimum of 20 percent of the hot leg indications with an amplitude between 1 and 2 volts, all hot leg indications with an amplitude 2 volts and above, and all cold leg indications. One hundred and seven indications had a bobbin voltage above 2 volts; 86 were confirmed as flaws and 88 were removed from service due to tube repairs.
qispe\ala97\ report \ cycle 14.rtp *2- Monday, May 5,1997.16.08 pm
t- .
. i In addition, an augmented RPC inspection was performed consistent with the NRC i requirements. All dented intersections with a bobbin voltage greater than 5 volts and a minimum of 20 percent of the dented intersections with a bobbin voltage between 2.5 and 5 volts were inspected with RPC. Large bobbin residual artifact signals were also RPC inspected. There were no RPC circumferential indications at the TSPs, no H indications extending outside the TSPs, and no RPC indications with potential ID phase angles.
1 A summary of EC indications for all three steam generators is shown on Table 1, j which tabulates the number of field bobbin indications, the number of those j indications that were RPC inspected, the number of RPC confirmed indications, and l the number ofindications removed from service due to tube repairs. The indications i that remain active for Cycle 15 operation is the difference between the observed and l the ones removed from service. A large number of tubes in SGs A and C previously !
plugged in accordance with prior repair criteria were deplugged, inspected and '
repaired in accordance with APC by installing sleeves or replugged. No deplugged tubes were returned to service in SG-B. Only 7 indications, all below the APC repair 1
limit, were left unrepaired in tubes returned to service in SGs A and C.
i A review of Table 1 indicates that more indications (a quantity of 973, with 561 l indications above 1.0 volt) would be returned to service in SG-C, more than the other SGs, thereby it potentially will be the limiting SG at EOC-15. It is noted that SG-C
- had the largest indication (13.7 volts) found in the EOC-14 inspection. Figure 1 shows the actual bobbin voltage distribution from the EOC-14 EC inspection; Figure 2 shows the population distribution of those EOC-14 indications removed from service due to tube repairs; Figure 3 shows the indications which could be returned to service for Cycle 14, per the preliminary tube repair list. Of the 425 indications to be removed from service,88 indications exceeding 2 volts are repaired due to ODSCC at TSPs. The rest of the indications are in tubes plugged for degradation mechanisms other than ODSCC at TSPs .
3.2 Voltage Gmwth Rates Table 2 shows the cumulative probability distribution function for growth rate of each !
Farley Unit I steam generator during the last 2 operating periods (Cycles 13 and 14). l The growth rates are presented on an EFPY basis to account for the difference in the length of the two operating periods. Figure 4 provides a comparison of the composite voltage growth from all three steam generators for the last four operating periods.
For Cycle 14 operation, SG-C has a larger average voltage growth among the three
- steam generators, and it also has the indication with the largest voltage growth. The composite growth rates from all SGs for Cycle 14 shown in Figure 4 appear to be higher than those for the two prior operating periods. ,
i !
q:\ ape \al.97\roport\ cycle 14.rty wond.y. u.y s,1997.1s:08 pm l l
1
.._ In Farley Unit-2, tubes deplugged and returned to service at EOC-10' had a significantly higher growth rate during Cycle 11 than the tubes active during Cycle
- 10. Therefore, it was recommended in Reference 5 that, for ARC projections following ;
return of deplugged tubes to service, an increased growth allowance be made for the i indications in the recovered tubes. If plant-specific historical growth . data for '
deplugged tubes are not available from prior cycles, it was suggested that Farley ,
j Unit-2 data be used. Accordingly, a composite growth distribution was used for Cycle _ j 15 projections and it was obtained by combining the Cycle 14 growth distribution !
with the Farley Unit-2 deplugged tube growth rates based on weighting the two ;
separate growth distributions by the number of each type ofindication returned to 2
service. However, as there a only a total of 7 indications active'in the deplugged i tubes returned to service for Cycle 15 (the rest are sleeved), the growth distributions used for Cycle 15 projections are essentially the same as the Cycle 14 distributions. !
4.0 Imak and Tube Analysis Ma*hada Monte Carlo analysis methods are used to calculate the SLB leak rates and tube burst probabilities for the actual voltage distributions. The methodology used complies with the Farley Unit 1 SER (hference 2) and GL 95-05 (Reference 1) and is described in the Westinghouse generic methods report of Reference 2. NDE uncertainties applied for the Cycle 14 voltage distributions in the Monte Carlo analyses for leak rate and burst probability are the same as those described in the Farley Unit 1 APC report of Reference 3. SLB leak and tube burst correlations based i on the database for 7/8" diameter tubes documented in Reference 4 were applied. The i
database does not meet the NRC requirement for a leak correlation and therefore the SLB leak rate was assumed to be independent of bobbin voltage. Leak rates and burst probabilities calculated using the actual voltage distributions are compared ;
, with the corresponding prior projections for EOC-14.
5.0 SLB Tmak Rate and Tube Burst Penhahility for EOC-14 l
L Using the methodology described above, analyses were performed to calculate EOC-14 l
SLB leak rates and tube burst probabilities for the actual bobbin voltage distribution l presented in Table 1. The results are summarized on Table 3. The corresponding results from the calculations performed during the last outage to project EOC-14 leak rates and tube N ' ?robabilities are also shown in Table 3. A comparison of the EOC-14 actuals d the corresponding predictions indicates the following:
b) The actual number ofindications found during EOC-14 inspection in all SGs
. are significantly below those projected during the last outage. The peak voltage measured is the same or lower for SGs A and B, but a single indication of 1 q:\ ape \ala97\ report \ cycle 14.rty Monday, May 5,1997,16:08 pm
""--71: we -
\
magnitude 13.7 volts found in SG-C exceeded the projection. i a)' SG-C was projected to be the limiting steam generator for EOC 14 based on EOC-13 EC data and SG-C was also determined to have the highest SLB leak rate based on actual EC bobbin measurements for EOC-14. For all SGs, SLB leak rate based on the actual voltages is less than the projections with a POD ;
of 0.6; they are also below the acceptance limit (11.4 gpm). I c) For SGs A and B, tube burst probability based on the actual voltages is less
! than the projections with a POD of 0.6; they are also below the NRC L -acceptance limit of10 8. The tube burst probability of 5.2x10'8 based on actual voltages for SG-C exceeds its projected value, but it is still much lower than .
l the allowable limiting value of 10'8 The difference between the actual and projected burst probability in SG-C is attributable just to the single large indication (13.7 volts) found above the predicted peak voltage (7.6 volts).
In summary, the limiting SLB leak rate (7.6 gpm) and tube burst probability (5.2x10-
- 8) calculated using the actual measured EOC-14 bobbin voltage distributions are l
below the correspondinglimits (11.4 gpm and 10'8, respectively). In the limiting SG-C, the leak rate of 7.6 gym based on the actual voltages is less than the 10.2 gpm projected using a constant POD value of 0.6, and the burst probability of 5.2x10 8 exceeds the projected value of 1.4x10 8. The results meet the APC requirement for continued operation.
6.0 IAnk and Tube Bumt Pndections fbr EOC-15 l Monte Carlo analyses have also been performed to predict the EOC-15 performance
! of all three steam generators in Farley Unit-1, and the results are summarized in Table 3. The results are preliminary pending determination of the final tube repair list following completion of sleeving operation. As discussed in Section 3, an allowance was made to account for potentially increased growth in indications among deplugged tubes returned to service for Cycle 15. A composite growth distribution obtained by combining Cycle 14 growth distribution with the Farley Unit-2 deplugged tube growth rates, based on weighting the two separate growth distributions by the number of each type of indication returned to service, was used for Cycle 15 ,
i projections.
Since SG-C has both the highest number indications as well as the largest indication returned to service for Cycle 15, it was projected to be the limiting SG. The predicted EOC-15 SLB leak rate for SG-C based on the present licensing-basis database and
. method (constant POD of 0.6 and a leak rate independent of voltage) is 15.4 gpm which exceeds the current licensed limit of 11.4 gpm. However, a license amendment
\ \ala97\repen\ cycle 14.np 4 ape Monday, May 5,1997,16:06 pm
. h
to revise the acceptable SLB leakage limit to 19 gpm is pending and it envelopes the projected leak rate. The EOC-15 SLB tube burst probabilities for all three SGs are below 4
the NRC reporting guideline for tube burst probability of 1.0 x 10 . Thus, projected
. EOC-15 results meet the APC requirement for continued operation.
The use of a POD value of 0.6 is conservative beyond 1 volt and it is unrealistic beyond l about 3 volts where POD is likely to be unity. So, the EOC-15 SLB leak rate and tube burst probability for SG-C were also estimateA using two other POD distributions: 1) a !
step distribution with POD =0.6 up to 10 volts and POD =1 above 10 volts,2) voltage-i dependent POPCD distribution presented in Reference 5. These results are also shown in
! Table 3. The step POD distribution affects only the contribution of the 13.7 volt, repaired indication which is large enough to reduce the projected SLB burst probability for SG-C .
3 by 50% (from 9.6x10 to 6.3x10'3), further increasing margin to the allowable limit. With -
the voltage-dependent POPCD, the SLB burst probability is further reduced to 4.4x10-3 ,
and the leak rate is reduced to 9.6 gpm which is within the current limit of 11.4 gpm.
1
)
l 7.0 References
- 1. NRC Generic Letter 95-05, " Voltage-Based Repair Criteria for the Repair of Westinghouse Steam Generator Tubes Affected by Outside Diameter Stress Conosion Cracking", USNRC Office of Nuclear Reactor Regulation, August 3, 1995.
2, WCAP-14277, "SLB Leak Rate and Tube Burst Probability Analysis Methods for ODSCC at TSP Intersections", Revision, Westinghouse Nuclear Senices Division, December 1996.
- 3. SG-%-01-003, "Farley Unit-1,1995 Interim Plugging Criteria 90 Day Repc::," i Westinghouse Nuclear Senices Division, January 1996.
- 4. NSD-SGD-1212, "EPRI ARC Databases for 3/4" and 7/8" Dia. Tubes and Updated ARC Conelation for 7/8" Dia. Tubes," Westinghouse memorandum dated February 26,1996 transmitted to Duquesne Light Company and Tennessee Valley Authority.
- 5. SG-97-03-001, "Farley Unit-2,1996 Altemate Plugging Criteria 90 Day Report,"
Westinghouse Nuclear Services Division, March 1997. ,
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I 87 6 6 7 80 2 87 116 9 8 10 106 0 10 I 1.1 84 2 2 3 81 0 81 92 9 5 11 81 0 SI 1.2 60 5 5 10 50 0 50 71 4 4 4 67 0 67 ~
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- i Table 2 :
Farley Unit 1 April 97 -
Signal Growth Statistics For Cycle 14 on an EFPY Basis ggg Stessa Generator A Steam Generator B Steam Generator C Cuanulative l Volts Cycle 13 Cycle 14 Cycle 13 Cycle 14 Cycle 13 Cycle 14 Cycle 13 Cycle 14 No. of No. of No. of No. of ;
CPDF CPDF CPDF CPDF CPDF CPDF CPDF CPDF ;
Inds Inds Inds Inds .
-0.4 0.0 0 0.0 _ 0.001 0 0.0 _ 0.001 _ O 0.0 _ 0.001 0 0.0
, 0.0 _ _ 0.0 _ 0 ,__
-03 0.004 0 0.009 0 0.004 0.0 0.005, 0 0.0
- -0.2 0.024 1 0.001 0.03I I 0.00I 0.009 6 0.005 0.02I 8 0.003
_-0.l_ 0.I07 8 0.01 0.107 6 0.007 0.059 19 0.022 0.089 33 _ _ ,,0.013 _
_0.12I_
0 __0337_ 100 _0.118 0387_ _116 0.245_ 98 0.108 0317 _314 0.115 0.1 0.667 389 0.541 0.754 492 0.607 0.697 383 0.444 0.706 1264 0.527 0.2 0.838 281 0.847 0.919 294 0.896 0.906 407 0.801 0.889 982 0.846 03 0.945 86 0.94 0.978 73 0.968 0.972 150 0.932 0.%3 309 0.947 0.4 0.97 28 0.971 0.99 16 0.984 0.987 49 0.975 0.982 93 0.977 ,
0.5 0.986 I5 0.987 0.994 6 0.99 0.993 19 0.992 0.991 40_ _
0.99 7
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0.7 0.997_ 2 _ 0.996 0.996 5 0.998_ 0.996 2 0.996 0.996 0.996 _ '
0.8_ 0.999_ _O _ _0.996 1996_ 0 0.998 0.996 2 0.997 0.997_ 2 __ _
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Total 920 1014 1140 3074 GROWT11 als CPDFdata 5/1/971.59 PM ,
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! TaNe 3 l
! Farley Unit 1 1997 EOC-14 Outage l Summary of Cahmalations of Tube imak Rate and Burst ProbaMilty i
Nn=ha" SLB i
- Steam POD of Max. Burst Prv4=hility Ik i Generatar Indications Volt 4" Rate (sped 1 Tube 2 Tubes EOC - 14 PROJECTIONS
~
4 A 0.6 1276 6.9 7.5 x10
- 2.5 x10 7.1 a
B 0.6 1310 6.7 7.1 x 10' ' 1.9 x10 ' 6.0 C 0.6 1545 7.6 1.4 x10 8 1.9 x10.a 10.2 1
EOC - 14 ACTUAIR i
A 1 921 6.9 6.2 x10
- 1.9 x10 8 5.3 B 1 1014 3.7 1.9 x10 4 < 4 x 10 ' 4.2 C 1 1140 14.9 5.2 x10-a < 4 x 108 7.6
, EOC - 15 PROJECTIONS
- i A 0.6 1411'8' 13.5 2.5 x10 a 5.9 x 10- 8 10.7 B 0.6 156312> 13.4 2.1 x 10- 8 < 4 x 10- ' 9.3 0.6 1733'8' 14.7 9.6 x10 4 1.2 x10
- 15.6
, 0.6 s 10 Volts 1732'8) 14.1 6.3 x10 8 6.6 x10 8 15.4
- C 1.0 > 10 volts POPCD 119942' 13.0 4.4 x10 4 3.1 x 10- 6 9.6 jinta
! (1) Voltages include NDE uncertainties from Monte Carlo analyses and exceed measured voltages.
(2) Adjusted for POD.
l (3) Based on a Projected Cycle 15 length of 486 EFPD (1.33 EFPY) q:\ ape \ala97\ report \cyclel4.rtp Monday, May 5,1997,16:08 pm l
l l
t
. . ~ _ _ . - - - - ___ . . __ . = -.. . . - - . - . -. .-. -.-.. . -_. . - - . .- - - . - . _-
i Figure 1 Farley Unit 1 April 97 Outage Bobbin Voltage Distributions at EOC-14 for Tubes in Service During Cycle 14 140
~
120 -
BA
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100 - - -
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l j l s
- - - - - ~ ~ - -
20 - - -
^; ; ; ; ;
" " l ";' " -l : :- l -
O l l l l l . . . . : . l l l g
m n n % m n n n m m n
n a
n a
n n
n m
m M
m o o o o - - - - - g Bobbin Voltage 4
mw uisii ___ _ _ __-_-_____ - _ _ _ - _ _ - - _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - - - . - _ _ _ _ _ _ _ _ _ - _ - _ _ _ _ _ _ _ _ _ - - _ - _ _ - _ _ - _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ - - ._ --
4 i
Figure 2 Farley UnW 1 April 97 M10utage ,
Bobbin Voltage Distribution for Tubes Repaired After Cycle 14 Senice 20 18 - - - - - -
- BA 16 - -
14 - -
DB E
42- 1 l - -- -- -
J l ac 1 l l s'~
i.
l l
l l
l .
2 8-l l l l j
g j j l 2 l l l 6- ,
l l l
-l l l l l l l l l 4- l l L l -
i l l l l l 2- - - - - - - -
r l
l .
H ' - -
m -
2 : : : : 2 -w ;a: ; ; ; ; ; : ;
e3:
Bobbin Voltage Bobarpc abhg2
.. . .__. . - _ . _ _ . _ . _ _ . - _ _ _ _ _ _ _ _ _ _ . . _ - - _ . . _ . -_. _ . _ . _ - - -- ~. . ._ -__ ---- - -
i i
. i
- t Figure 3 Farley Unit 1 April 97 Outage
}
l Bobbin Voltage Distributions for Tubes Returned to Service for Cycle 15 120
.. (
i
- EA
- 300 ,
OB - --
80 -
l g ,
t l 4 !, .
i ac l
C 60 -
o l u . ;
2 i
, l z
l l
4o . _l j . _ _ _ . _ _
I E _
20 - - - - - - - - -
j j ;
i l i
l l
i !
O ^: : : : : : : : : ; ; ; ; ; ; ; : : A;- l -l :" : :
0.30.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 2.1 2.22.3 2.4 2.52.6 2.7 2.8 2.9 Bobbin Voltage ,
i i
1 % mo I !
l
a I
Figure 4 Farley Unit - 1 Growth History Cumulative Probability Distributions for Voltage Growth on am EFPY Basis Composite of All Three Steam Generators 1.0
,,_j g.;-;-: = ; = ; = = = = = =
r.A 0.9 -
- - - - - - p, ,'
j - - - - - - - - - - - - --
- 4 Y
0.8 -+1 ; - - - - - - - -
ll -
- I .I f 0 .7 -C* '
N
- I g
=
- g *
- -x- - Cycle 1 I l c0 .6 -
-s._t . _ _ _
& : : i j *4
--o-Cycle 12 0.5 ---:-l-
.I I
-- o --Cycle 13
? 0.4
- I3
-+ t ./ -~
a .
3 *
--* - Cycle 14
- ,d-: ' 1-u l0.3 l I p' i
0.2 -
g./ -- - - - - _ _ . - - -
l l
! 0.1 gj-i.f - - - - - _ - - -
0.0 A
, , - o - , , , , , , , , - - , , , , . - , . . .
9 9 9 o o o o o o o o o - - - - - a n W M 6 Voltage Growth At MJB T10 shPige 93r1PW7 $ 98 Pte r
_- - - - - - - - - - - - - - - - _ - - - - - - _ _ - - _ _ - - - - - - - _ _ _ _. - - - - -. . - _ - - - - -- _ ---- - - - - - - -