ML20031B629
| ML20031B629 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 02/28/1981 |
| From: | Riccardella P NUTECH ENGINEERS, INC. |
| To: | |
| Shared Package | |
| ML20031B627 | List: |
| References | |
| RTR-NUREG-0619, RTR-NUREG-619 NUDOCS 8110050266 | |
| Download: ML20031B629 (46) | |
Text
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i NUTECil'S FEEDWATER N0ZZLE BYPASS LEAKAGE MONITORING SYSTEM PRESENTED BY:
4 l
P. C. RICCARDELLA FEBRUARY,1981 I
l l
I.
INTRODUCTION II.
TECHNICAL. BASIS LEAKAGE MONITOR 4
III.
PHYSICAL Iris'ilduul0N l
IV.
INITIAL DATA ANALYSIS AND INTERPRETATION i
V.
ADVANCED DATA ANALYSIS AND INTERPRETATION VI.
SENEFITS i
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e NOEELE CRACKS HOT h R.bCTOR Y WATER 2
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L IfflERMAL FATIGUE CRACKS IN BWR FEEDWATER NOZZLES l
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Flow T
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Map Rate Feedwater Reactor p
Region t
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it' 1-100 363 546 5883 2
N 2
84 352 544 1248 m
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TECHNICAL BASIS FOR LEAKAGE MONITOR i
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BASIC CONCEPT e ANALYTICAL MonEL
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I, ANNULUS FLUID TEMPERATURES FOR LEAKAGE MONITORING CALCULATIONS i
edwater Normalized Temperature (T
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- BOTTOM T/Cs (ALL FOUR N0ZZLES) 10 20 30 40 50 60 70 80 90 100 FEEDWATER FLOW RATE (t OF RATED) 3 C.
r=e RESULTS OF FEEDWATER N0ZZLE BYPASS LEAKAGE O7 MONITORING AT MONTICELLO
S 8
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i RAPID CYCLE FATIGUE USAGE CURVE FOR l
INTERPRETATION OF LEAKAGE MONITORING DATA h.#r Tc U c-f L O nutech ng u
III.
PHYSICAL INSTALLATION DETECTORS WELDABLE TYPE T (COPPER-C0ilSTANTAl0 TilERM0 COUPLE ATTACHED T0 il0ZZLE BY ELECTRIC RESISTA! ICE SPOT WELDIi1G OUALIFICATION TESTS INDICATE THAT WELDS ARE RELIABLE, FREE OF CRACKS, LACK OF PENETRATION, OTHER ANOMALIES MAX DEPTH OF llAZ IS 0.0023 INCHES MAX HARDNESS IS R 52.5 C
EVALUATION INDICATES THAT llAZ IS LESS THAN 1/10 0F SECTION XI ALLOWABLE FLAW SIZE FOR PLANAR INDICATIONS DETECTED DURING PRE-SERVICE OR IN-SERVICE INSPECTIONS.
THERMOCOUPLES '?ISUALLY EXAMINED ONCE PER OPERATING CYCLE.
CONCLUDE THAT THE SPOT WELDS WILL HAVE NO DETRIMENTAL EFFECT ON RPV INTEGRITY.
U SIX THERM 0 COUPLES PER l!0ZZLE (345, 0, 15, 165, 130, 190 )
AXIAL LOCATI0il SHOWil O!! FIGURE DilE.
BASIS FOR AXIAL LOCATI0tl Sil0Wil Oil FIGURE TWO.
111-1
e DATA PRESENTATION EXTENSION LEADS ROUTED BETWEEN RPV INSULATION AND BIO SHIELD TO JUNCTION E0X ON TOP 0F BIO SHIELD (SEE FIGURES THREE, FOUR AND FIVE),
ISI REQUIREMENTS CONSIDERED IN ROUTING 0F LEADS, MULlirAIR THERM 0 COUPLE EXTENSION LEAD CARRIES SIGNAL TO DW PENETRATION TO RECORDER, RECORDER IS L&N SPEEDOMAX 250 MULTIPOINT LOCATED IN REACTOR BUILDING, ACCURACY OF FW N0ZZLE TEMPERATURE MONITORING SYSTEM IS i2 F.
PROCESS COMPUTER IS USED TO READ 10 MINUTE AVERAGES OF OTHER PARAMETERS HEEDED FOR LEAKAGE CALCULATION, FW TEMP 1/2 F
l FW FLOW i
1/2% OF RANGE Rx Paess 1/2% OF RANGE i
INSTRUMENT ACCURACY OF SYSTEM IS i.1 GPM.
CALIBRATION PERFORMED ON AN ANUUAL BASIS, III - 2
4 t
NO2 ELE T/C LOCATION l
SAFE-ENQ Agog CLASS 2.
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+ N $' b
wasqqheedibybee f
)
o 4 ~3!# si M n@ % s @ $l f
SC w*
.A.r tu W
- fddhkhNf/N y9MW,dN k
U
~
- 9 N *~ ' "
i
_e s a _k-[ NY^NINha'kN+kh I
i LEAKAGE '$ 'PRgggCTIONS.6n
~
A N A L.YTIC A *
+
v h N khh
' * *n
% ~e y
- 'v *
+
u' lswl' eyek s@a@n%ji<%,p n g
+>
4$$!
i m,. y %4tw?{?$$Y$i'
/
- gg.py ~n I
fi<f' d+i i
mm wi+[;w2,1ff+':%sbtMLk:,4% ~ '
^
'd A
L' I
a
' ":'+;S:sh s e
W<..
- f. % RV;;;F #;A;+r
/
y%
mN
%,W '. % *
.s k$Y lG5$:h.
/
4 sG.. yW;d,eW, ^ :x':
l Q
l f8hrNMet*hk4 N'$k$$'h$ rw$F;':ih yg M ?M 9%b ~
u f
hbd'$hfSGh:{bY5'!%'s:$@gs h.w'k j
l W e$hW$%m?Mf'd'p!OMM?;A@
s.es l
iungtMGi@o lhy W "I g$f!@~ $$j,a'.y#n"eW {t@on.,
~
h 68)
.,r9 t Q
gw w
~
l D
ww
- E-
/
me,.a
. a:qjiSUN@yM#se.J:!,"'t% g m e s W j h g g a:g a v d:' ' hIlbN$kkkhkkd'5$)m'I$h[fy$xf$kk'h. [e
/
/
s bN I l
l h
mynNy#e8 n; by n
3 am
'2*ftMb'd$;#6@@h qw I
'< w-I i
J J
i O
2 4
6 8
10 12 14 16 DISTANCE FROM THERMAL SLEEVE SEAL (IN) j FIGURE TWO.
T/C LOCATION BASIS
)
4 1
FIGURE THREE.
L01lELIZC_LolATLOILS
/
(
Iss' w-18 0' C
/6 5'-
/ES* -
\\)
x\\
FEEDl!ATER i!0ZZl E "OlTOM V!0l 7
If!DICATES T/C LOCATI0ii O
li DICATES HOLD D0h'il CLIP LOCATION III - 5
}
FIGURE FOUR, UPPER T/C LOCATI0ilS
]
/
(
ajo,=
C
'C C
D-345'-
N FEED'..'ATER H0ZZLE TOP VIF!!
U lilDICATES T/C LOCATIO:1 O
IriDICATES HOLD DOWil CLIP LOCATIO;!
III - 6
i FIGURE FIVE; T/C INTEGML_ LEAD WIRE ROUTif'G
\\
T/C ItJTEGRAL t
BIOLOGIC AL SHIELD P
f
/
i RPV i
1 b
-g r-l L e -- J r
(
FW NOZZLE V
r* - K h
/
I l
/
BIOLOGIC AL SHIELD v
s III - 7
a I
l IV.
IllITIAL DATA AtlALYSIS AllD INTERPRETATION 1
i 1
l e
FIELD DATA IIONITORING PROCEDURE
- DATA RECORDED
- FREQUENCY
- INTERPRETATION e
SUMMARY
OF FIELD DATA TO DATE
- LEAKAGE PROJECTIONS
- USAGE FACTOR PROJECTIONS l
i i
i i
Iv - 1 nutech
FIELDDATAMONITORINGPROC(DURES PERIODICALLY RECORD TEMPERATURES OF ALL SIX o
THERMOCOUPLES ON EACH N0ZZLE AT OR NEAR FULL REACTOR POWER.
SIMULTANEOUSLY OBTAIN FOLLOWING DATA FROM PLANT e
PROCESS COMPUTER FEEDWATER INLET TEMPERATURE FEEDWATER FLOW RATE REACTOR PRESSURE / TEMPERATURE i
CALCULATE NORMALIZED THERMOCOUPLE TEMPERATURE IN e
ACCORDANCE WITH FOLLOWING EQUATION IT/c Tpg T=
-T REACTOR Fw CALCULATE THERMAL SLEEVE BYPASS LEAKAGE IN e
ACCORDANCE WITH FOLLOWING EQUATION:
L(GPM) = (3.14-4.9x10-3 Q
-3.53T)hD Fw EXTRAPOLATE MEASURED LEAKAGE TO 100% POWER a
i IV - 2
TYPICAL RESULT OF FEEDWATER BYPASS LEAKAGE
~
MONITORING AT MONT!CEl_LO DATE:
2/6/80 FLOW RATE:
74.6%
TREACTOR
'O N0ZZLES A & B)
TFEEDWATER:
0 356.4 F (N0ZZLES C 8 D)
TEMP LEAKAGE i
THERMOCOUPLE N0ZZLE AZIMUTH T/C LOCATION OF T
(GPM) 1 A
345 TOP 532
.93 2
A 000 TOP 527
.90 l
3 A
015 TOP 523
.88 4
A 165 BOTTOM 520
.86 0
5 A
180 BOTTOM 516
.84 0
6 A
195 BOTTOM 515
.84 0
l 7
B 345 TOP 536
.95 8
B 000 TOP 536
.95 9
B 015 TOP 536
.95 10 B
165 BOTTOM 505
.78 0.03 11 B
180 BOTTOM 493
.72 0.31 4
12 B
195 BOTTOM 501
.76 0.12 13 C
345 TOP 534
.94 14 C
000 TOP 534
.94 15 C
015 TOP 534
.94 16 C
165 BOTTOM 515
.84 0
17 C
180 BOTTOM 18 C
195 BOTTOM 504
.78 0.03 19 D
345 TOP 534
.94 20 D
000 TOP 535
.94 21 D
015 TOP 535
.94 22 D
165 BOTTOM 476
.63 0.74 23 D
180 BOTTOM 494
.73 0.26 24 D
195 BOTTOM 508
.80 0
IV - 3
1.25
/
LEAKAGE MONITOR e
/
DATA 1.0
/
N0ZZLE D
/
N0ZZLE B f
f l
x x
/
/
Q 1
.75 PROJECTED RATE OF f
f SEAL DEGRADATION
/
/
v BASED ON DESIGN
/
/
2 ua
/
BASIS CORR 0 ION x
(.35 GPM/YR
.c
/
/
/
/
.50
/
/
/
?
/
/
/
/
/
X x/
.25
/
/
/
/
/
/
/
N0ZZLES f
f A&C
/
y 1.0 2.0 3.0 3C TIME SINCE SPARGER (YEARS)
INSTALLATION g=
..i....__
PROJECTED FATIGUE USAGE FACTOR BASED ON LEAKAGE MONITOR RESULTS 0,5 N0ZZLE D e
0,4
=
x N0ZZLE B 3
0,3 2
E W
Bs 0,2 E
S E
LL 0,1 f
f s
I 1
3 I
"l3 1.0 2.0 3.0 C
.-+.
TIME SINCE SPARGER INSTALLATION (YEARS) 7
V.
ADVANCED DATA ANALYSIS AND INTERPRETATION e
OBJECTIVES
- IMPROVE ACCURACY
- CONSIDER LOCAi_ LEAKAGE e
APPROACH
- MORE DETAILED LOOK AT FIELD DATA TO ESTABLISH BASE-LINE AND TRENDS
- CIRCUMFERENTIAL HEAT FLOW MODEL TO EXPLAIN LOWER THAN EXPECTED TOP-TO-BOTTOM GRADIENT
- FLUID FLOW / JET MODEL TO ADDRESS LOCAL LEAKAGE EFFECTS e
RESULTS V-1
FIELD. DATA e
e BOTTOM TC's:
floz A & C hot l
Noz B & D COLD 1
e TC a 180 Is NoT ALWAYS COLDEST e
Down TREND WITH IIME FOR D Noz I
345 0*
15" i
i l
i t
i l
l 195 180 165 1
nutech V-2
.___-...._ _ _. c _ _ _
E
~
I F-I m
g
?
ut e
r w
s,%;[
d' 3
,g
- [
,p g
8 I
EE' 55 I
5&
'l EM
<i H5 y-Eg
.6
=
.5 N0ZZLE A
(NON-LEAKING) 11/78 12/78 1/79 2/79 3/79 4/79 5/79 6/79 7/79 8/79 9/7910/7911/7912/7h 1/80 2/80 3
TIME (MONTHS)
Cp BOTTOM THERMOCOUPLE IEMPERATURES VS IIME FOR 95% TO 100% RATED FEEDWATER FLOW
1\\
l l
ll,1I 1
1 l
0 8
~
/
~
2
~
0
~
8
/
1 d
7
/
2 1
9 7
/
9 1
1
~
~
N 7
/
~
0 N
,N 1
9 7
/
9 E
/
/
M
,d-9 I
N.
7 I
/
W 8
S O
)
V L
G 9
F 7
N S
/
I
/
E R
K 7
f
/
R E
A U
T y
q E
9
)
T A
L 7
S A
W
(
/
H R
D 6
T S
\\
E E
N P
E K
O 9
M F l
M E
7
(
/
I D
f[
/
D 5
E E
E T
M L
A 9
E
.q N
4 I
7 P R L
T U
/
~
y Z
~
4 O %
Z C 0
\\
0 9
0 0 N
e
/
7 M 1
/
R
[
3 E
O m
H T
9 I
~
7
/
M 5 2
O 9 T
9 T
R 7
G O
/
U F
1 "N
8 7
/
2 1
8
~
7
~
/
0 1
8 7
6 5
1 E*i gSW=s gO,h=i5S l
E r, ub~
my E3 S 3CgO7 g#
l
u 1.0 ZERO LEAKAGE IREND_Cl) AVES INITIAL CORRELATION (P 11-7)
I
/7 ADVANCED CORRELATION
.9
.9
~
Q
' # q'
-l.
"/l/o
-u-8
- j::
I a #
c -JT'
")
e e
N x
x' e
i e
x
- --:e j3
.8 Nr x
3J{
x F.
.8 u
~
s u
'N x
6 3
x I ~E'v if N
tY n
K w
f i
.7
.7 8
m Sw iE s w s
/
THREE T/ 'S i
BOTT0F
.6
(
n___o _..,c_u,n_i.
.6 w
d t" dz 5
I FALL
[9f8'~
'5 Z
3 STARTUP
):
fWINTER1980
)(
C00LDOWN o
t 10%
20%
30%
11 0 %
50%
60%
70%
80%
90%
100%
{
FEEDWATER FLOW RATE (% OF RATED)
+
0 N0ZZLE A - BOTTOM THERMOCOUPLE TEMPERATURES VS 7
FEEDWATER FLOW RATE (POWER LEVEL)
1.0
{
- ADVANCED ZERO LEAKAGE o
.9 y
TREND CURVE
.9
~ ~. '. -
a
\\
",e C
'~
x
=
~
o "x*N N
o t,,
i e
x x i
~
s CEI I
iP 1'
O N
in gi ip
<p
.. fN'(q, R
d
,8 xd 4.
.8 I
T!
- N,
- e u n '
~
r l
t x
a s
x" g~s xx.
x I
o I
',' 'ic3/,
"y
%,,: ;4 l
l C
s m
s
.m x x x
s j'
l l
l a:l l
)
~E~
"d d
T i
.7
\\
.e x
7 f
8 EE_ jj...j" lx o
p s
i m
a w N
x si j
re
,N x a l
s w s s
r-<
LOWER BOUND OF N
H m s,,
N0ZZLE D DATA
.6 S g
.6 9
]"
Eeo c
1
=
i FALL 1978
.5 f.c J
STARTUP
)
l I
WINTER 1980 5
C00LDOWN
)
3C 10%
20%
30%
11 0 %
50%
60%
70%
80%
90%
100%
(D FEEDWATER FLOW RATE (% OF RATED)
Oy N0ZZLE D - BOTTOM THERMOCOUPLE IEMPERATURES VS FEEDWATER FLOW RATE (POWER LEVEL)
CIRCUMFEREi1TAL HEAT FLOW MODEL M
T 4.0 g
(
m
'hTft=6.90 T
=0.0 f-T3 2 0.50 To 0.70 3
a 4
AXISYMMETRIC MODEL Trt = 1.0 i,
+
q T
= 0.0 g
- ]
RING j/
MODEL nutech V-7
s
- 1 D-1.00 -
e B
O I
s s
.625 A
h - 1000, t
~
E d
H H
B h=
250, t =.625 and j
1.25 h - 1000, t 1.25 and m ~-
C h-250, t 4
gg 1.875
/
h - 1000, t
=
~
H a m d
A 1.875
]$
/
D h=
250, t
=
5 :)
/
s!
ox 0.0 0
15 30 45 60 75 90 4
ANGill.AR LOCATION (DlIG FROM BOTTOM)
RING MODl!L RESULTS - OUTSIN! SURFACII 3
TliMPliRATURiiS FOR COLD FLUID S?RATIFIT!D Ch IN BOTTOM 30 SliGMENT OF N0ZZLE o
"Y
1 00 -
H H
.625 A
h = 1000, t =
g m
s s
.50 B
h=
250, t =.625 and O
h = 1000, t = 1.25 m
c.-
l b
D/
C h=
250, t = 1.25 and H
hh j
h = 1000, t = 1.875
~"
C
/
B m
D h=
250, t = 1.875 0.0 60 75 90 0
15 30 45 f
ANGULAR LOCATION (DEG FROM BOTTOM)
RING MODEL RESULTS - OUTSIDE SURPACE 3C TEMPERATURES FOR COLD FLUID STRATIFIED e=+
IN BOTTOM 60* SEGMENT OF N0ZZLE 0
'T
s i
APPLICATION OF RING MODEL RESULTS i
e COMPARISON OF RING MODEL RESULTS TO FIELD DATA LEADS TO CONCLUSION THAT CASE B APPROXIMATION IS MOST APPLICABLE WITH COLD FLUID STRATIFIED 0
0 BETWEEN 30 AND 60 l
e ASSUMING SAME APPROXIMATION STILL APPLICABLE TO LEAKAGE CASE LEADS TO FOLLOWING ADJUSTMENT l
TO AXISYMMETRIC ANALYSIS:
T.5 T
1 ZERo LEAKAGE GPM FLUID TEMPERATURE
.53 e
i METAL TEMPERATURE
.43 (AXISYMMETRIC ANAL)?
l l
METAL TEMPERATURE
.39 (RING MODEL) i l
5 V - 10 4
, _, -, _ - _ - _.. _ _ _., _, _..,. _. - - _.,.., _.,. _ _ -. _ _.. _ _ _ _.,. ~,,.. _ _..,..,..
I
~
FLUID TEMPERATURE OBSERVATIONS FROM SPARGER TEST DATA TOP
\\
)
HOT SAFE END BLEND RADIUS (SEAL)
- ~ [- -
o MIXING
_ COLD BOTTOM 0
rg HOT o
^
W l-THERMOCOUPLE j
LOCATIONS
(
J D
HOT s
m l
nutech V-11
a JET MODEL e
TURBULENT JET e
INITIAL VELOCITY BASED ON FLOW AND PRESSURE DROP e
F0uMD DISTANCE TO REACH 1 FT/SEC JET PEN'N 9
JET PENETRATION DIST.
~
(GPM)
DIST. (IN.)
1r-q O DEG
.5 1.0 1.5
]
e 90 1.1 3.2 5.8 d
180
.3 1.1 2.0 360
.1
.3
.7 e
ASSUMPTION - GRAVITv PULLS JET STREAM TO BOTTOM llHEN JET VELOCITY REACHES 1 FT/SEC nutech V-12
}
~
^
UNIFORM
]
LEAKAGE
]
]
o J
(
~-_
LOCAL N
- -s LEAKAGE E
?
W J
AT BOTTOM
~
LOW LOCAL LEAVAGE
~
AT TOP
\\?
-l
)
?
THE TEMP M0ilITOR DETECTS THESE CASES ADEQUATELY WITH
[10 SPECIAL EVALUATI0il REQUIRED V-13 nutech
HIGH LOCAL LEAKAGE AT TOP aa v
SPECIAL EVALUATION REQUIRED ASSUMPTIONS:
JET MODEL/ DENSITY IREND o
LEAKAGE INCREASED WITH IIME e
ASSUME LEAKAGE IS LINEAR WITH POWER EVALUATION:
o0 oo c [
O o o o c ooo g
o TEMP VS TIME O
JET STREAM PASSES TC g
$0 C 0 c 0gooo TIME (MONTHS)
~s c
c c 0
TEMP VS POWER c
c EXTRAPOLATE LEAKAGE g a o
6
~
-- s f,,
C D
TO RATED CONDITIONS
~o POWER (%)
V-14 nutech l
I
CONCLUSIONS FROM FLUID FLOW / JET MODEL 1
I t
e NO SPECIAL EVALUATION REQUIRED FOR LOCIAL LEAKAGE AT BOTTOM AND L0w LEAKAGES AT IOP 0
HIGH LOCIAL LEAKAGES AT TOP DETECTED BY
~
SPECIAL EVALUATION o
"HIGH" IOP LEAKAGE IS 1 GPM x
90 OR ABOVE V-15
\\
ADVANCED LEAKAGE M0illTOR CORRELATI0l1 RESULTS h.:=
fto i
i i
-_=
~5 9 %
F 5
.8
~ _
~ ' ~
u U
1 ZERO J LEAKAGE
~-
Q
.7 ADVANCED CORRELATION o
'6
- --- ORIGINAL CORRELATION g
o 55
.i.5 gg g
-~_
m
.4 3P
~
1.5 GPM LEAKAGE 5a
.3 S
.2 I
I I
I 0
20 40 60 80 100 FEEDWATER FLOW MTE (% OF RATED)
PROCEDURE o
BASE LINE DATA 0
IAKE DATA PERIODICALLY AT RATED POWER 0
IAKE DATA DURING POWER LOADING AND UNLOADING IF LEAKAGE IS DETECTED 0
ALWAYS USE MINIMUM IHERM0 COUPLE IEllPERATURE AT EACH N0ZZLE nuteCh v-16
1 l
4 l
j 1,0 2
Oi ADVANCED CORRELATION e
O y
/'
?
E
'75 t
2 ca Y
n
/
/
g
.50 N/
/
ORIGIONAL CORRELATION
.25 3
0 a
8 I
C 0
1.0 2.0 3.0 (h
TIME SINCE SPARGER INSTALLATION (YRS) h-PROJECTED LEAKAGE FOR fiONTICELLO FEEDWATER N0ZZLE D
. o 1
?
~
PROJECTED FATIGUE USAGE FACTOR FOR N0ZZLE D 0.5 -
BLEND RADIUS - BASED ON ADVANCED LEAKAGE MONITOR CORRELATION e
0, l4 Sa L'
/
tu d;
e 0.3 BASED ON ADVANCED
/
LEAKAGE CORRELATION
/
o
/ /
O
?
/
/
0,2
,/
/
/
/
l 0,1 f
/
BASED ON ORIGINAL
/
,/
LEAKAGE CORRELATION 5
0.0
~
~ ' ~ ~ ~ ~ ~ '
0 1.0 2.0 3.0 c
e6;)
O TIME SINCE SPARGER INSTALLATION
- r (YEARS)
as
(
i VI.
BENEFITS e
NUREG-0619 ENCOURAGES USE OF ON-LINE LEAKAGE MONITORING AS POTENTIAL MEANS OF REDUCING AND EVEN ELIMINATING IN-VESSEL PT EXAMINATION OF N0ZZLE.
o EARLY INSTALLATION PERMITS ESTABLISHMENT OF SUBSTANTIAL DATA BASE FOR NON-LEAKING N0ZZLE/SPARGER CONFIGURATION.
8 IF BYPASS LEAKAGE OCCURS, THE SYSTEM PROVIDES SUFFICIENT EARLY WARNING TO PERMIT ORDERLY PLANNING FOR CORRECTIVE ACTION DURING ROUTINE REF ELING OUTAGE.
O LEAKAGE MONITORING SYSTEM MAY BE USED TO SUPPODT ARGUMENTS FOR NOT IMPLEMENTING NUREG-0619 SYSTEM MODIFICATIONS.
(RWCU REROUTE AND LOW FLOW CONTROLER MODIFICATION) fl deb saK E
A iI eau enwnf m +- +o ecy cn cbiAdch coo /I VI-1 nutech
/tj 6<it ti iLi4 =l--(,.
o
SUMMARY
- N0ZZLE INNZR RADIUS EXAMS
=
The Feedwater inner radius exams performed at Vermont Yankee were performed from the vessel shell.
The sound beam was directed at a 20' skew angle which
~.,
pioduced a beam center lane tangent to the inner radius.
The angle of examination was a 70' shear wave.
(fig 1)
The examination was performed in accordance with NES procedure 80A3223, as
~
approved by YAEC.
The procedure included a nozzle bore examination (fig 2) from the nozzle barrelm This examination required a low shear angle to place the beam center on a chord which would be tangent to the ID of the nozzle.
This low angle had a compressional wave (longitudinal) component which caused significant interference in calibration.
The mode converted beam interference made calibration impossible and this portion of the exams was deleted.
A significant<
area of the inner radius and bore are covered by the plate ride exam, The barrel exam will be modified to liminate the difficulties caused by the mode conversion of the low shear angle beam.
Using the plate side and barrel exam provides coverage of the area of interest with some limited coverage in a narrow band between the inner edge of l
l the radius and the bore.
The band of limited coverage must be assumed because beam t
center-line methods are used to plot areas of coverage and overlap.
These e-car, l
occur at the 3 and 9 0' Clock positions on the nozzle.
If the argument of beam vidth (beam spread) is used in examining coverage of limited areas, the areas which are not interogated are reduced significantly. This coverage will be the l
l subject of a detailed investigation along with the improvement of bore side examinations, i
(
/
.4o Vermont Yankee w;11 continue to require that examination personnel be All data vill be plotted which trained and qualified on norzle mock-up.
This level is currently exceeds the reference Icvel as de' fined in the procedure.
at 30% FSH peak.
Scanning is therefore 50% FSH above the clad noise which is set at 80% FSH when clad noise is 30% FSH.
set e
e