ML19326B692: Difference between revisions
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{{#Wiki_filter:. ,. - . - .. , . . . - - . .. | {{#Wiki_filter:. ,. - . - .. , . . . - - . .. | ||
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(/ -1.: TAbnormal= Occurrence Repo'rt No. ~-50-313/74-12A- | (/ -1.: TAbnormal= Occurrence Repo'rt No. ~-50-313/74-12A- | ||
?2. . Report Dato: '3. Occurrence Date: 11/9/74 | ?2. . Report Dato: '3. Occurrence Date: 11/9/74 | ||
;4.- Facility: Arkansas Nuclear One-Unit 1 i | ;4.- Facility: Arkansas Nuclear One-Unit 1 i | ||
Russellville,' Arkansas S.- Identification'of Occurrence: - | Russellville,' Arkansas S.- Identification'of Occurrence: - | ||
. PDT-103S,' PDT-1037, and PT 1039 Reactor Protection System (RPS) instrument'line. socket-weld failure. | . PDT-103S,' PDT-1037, and PT 1039 Reactor Protection System (RPS) instrument'line. socket-weld failure. | ||
M 6.. Conditions Prior to' Occurrence: - | M 6.. Conditions Prior to' Occurrence: - | ||
Steady-State Power Reactor Power 'O FlWth - | Steady-State Power Reactor Power 'O FlWth - | ||
| Line 48: | Line 32: | ||
Refueling Shut'down Load Changes During Routine. | Refueling Shut'down Load Changes During Routine. | ||
. Power Operation | . Power Operation | ||
,Routinc Startup Operation- | ,Routinc Startup Operation-Routine Shutdown -' | ||
Routine Shutdown -' | |||
} Operation | } Operation | ||
.' Other '(specify) s-s- | |||
.' Other '(specify) s- | f | ||
s-f | |||
: 7. Description of Occurrence: | : 7. Description of Occurrence: | ||
4 | 4 | ||
:See Abnormal Occurrence Report 50-313/74-12. | :See Abnormal Occurrence Report 50-313/74-12. | ||
1 i :: | 1 i :: | ||
? * | ? * | ||
: p. . | : p. . | ||
L u | L u | ||
(~'N ' s o 04170[3[ . | (~'N ' s o 04170[3[ . | ||
. A+- | . A+- | ||
~ Mareh 4,.1975 1NSP-10, Rev.r2'. : Page 2 of 4 | ~ Mareh 4,.1975 1NSP-10, Rev.r2'. : Page 2 of 4 | ||
\' | \' | ||
o | o | ||
. ,a : .. ... z - | . ,a : .. ... z - | ||
__-m..-.._.._..- _.~_-.m..- .- . _ . . - - - . - | __-m..-.._.._..- _.~_-.m..- .- . _ . . - - - . - | ||
3 | 3 | ||
* y; ~ - .- | * y; ~ - .- | ||
. s, | . s, | ||
~ | ~ | ||
( t | ( t 5 (~Nt | ||
5 (~Nt | |||
~~ | ~~ | ||
5 Abnormal Occurrence Report .No. 50-313/74-12A | 5 Abnormal Occurrence Report .No. 50-313/74-12A | ||
| Line 112: | Line 63: | ||
_ Installation / X Construction- Component Failure Operator Other ;(specify) - | _ Installation / X Construction- Component Failure Operator Other ;(specify) - | ||
: 9. Analysis of Occurrence: | : 9. Analysis of Occurrence: | ||
Two instrument line samples each containing a weld which showed liquid penetrant: indications were subjected to metallurgical examination. | |||
Photographs of the samplesL are attached -(Figures 1 and 2). -Both samples Jwere~ sectioned to explore the cause of the examinations. Visual exam-ination of longitudinal sections prepared from the samples disclosed | Photographs of the samplesL are attached -(Figures 1 and 2). -Both samples Jwere~ sectioned to explore the cause of the examinations. Visual exam-ination of longitudinal sections prepared from the samples disclosed crsvices- open to the external surface at the locations of the liquid penetrant indications. An over-all view of the longitudinal section -- | ||
crsvices- open to the external surface at the locations of the liquid penetrant indications. An over-all view of the longitudinal section -- | |||
- sm | - sm | ||
.from PDT-1039 is provided_in the attached Figure 3. The crevices of both samples are in the same relative position, that is, at the center of the weld face. | .from PDT-1039 is provided_in the attached Figure 3. The crevices of both samples are in the same relative position, that is, at the center of the weld face. | ||
Examination at a higher magnification of the surface crevices (as shown 2 | Examination at a higher magnification of the surface crevices (as shown 2 | ||
.in Figure 4). indicate that they are interdendritic shrinkage imperfec- , | .in Figure 4). indicate that they are interdendritic shrinkage imperfec- , | ||
tions. These are limited in_depty to 0.009 and 0.034 inch for sample PDT-1037 and PDT-1039 respectively. , | tions. These are limited in_depty to 0.009 and 0.034 inch for sample PDT-1037 and PDT-1039 respectively. , | ||
L I). | L I). | ||
.bbrsh 4,1975 NSP-10, Rev._2 Page 3Of4 - | .bbrsh 4,1975 NSP-10, Rev._2 Page 3Of4 - | ||
u ' | u ' | ||
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~ Alniorma~1: Occurrence Rcport No. 313/7_4-12A- | ~ Alniorma~1: Occurrence Rcport No. 313/7_4-12A- | ||
; | ; | ||
I | I | ||
. 210.1 Corrective ' Action: | . 210.1 Corrective ' Action: | ||
| Line 179: | Line 97: | ||
!? :- ! | !? :- ! | ||
1_ . . i W - | 1_ . . i W - | ||
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- See 'AOR :50-313/74-12.c -! | - See 'AOR :50-313/74-12.c -! | ||
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: 11. ;Fabure Data: . I | : 11. ;Fabure Data: . I | ||
.. 1 s-- cNo;pr'iorJ failures of_this type, o | |||
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: c. .. March'4 (11375 . !NSP_-10,:Rev. 2: Page 4 of _4_- | : c. .. March'4 (11375 . !NSP_-10,:Rev. 2: Page 4 of _4_- | ||
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h.b L,27 i . 3. . . ., . r . . . ,3 .y | |||
; | ; | ||
- Figure 1 Instrument Line Sampics - | - Figure 1 Instrument Line Sampics - | ||
| Line 365: | Line 195: | ||
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II. . | II. . | ||
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1 , | 1 , | ||
S,jfhy.;> '' | S,jfhy.;> '' | ||
, b -- (..5 , l7.1 | , b -- (..5 , l7.1 | ||
| Line 403: | Line 215: | ||
'r , f,gl,,. .'b, a | 'r , f,gl,,. .'b, a | ||
.' ".~. jiy ,:... .._ , | .' ".~. jiy ,:... .._ , | ||
d k' *, ' | d k' *, ' | ||
.%.t f. '' | .%.t f. '' | ||
y,:.w s'' w_ ".0.tn ,c;v1: n (;. | y,:.w s'' w_ ".0.tn ,c;v1: n (;. | ||
'. G ; '. c%. 91. | '. G ; '. c%. 91. | ||
. I - | . I - | ||
:s . a4. | :s . a4. | ||
..y... ,, | ..y... ,, | ||
(@f.y 4 | (@f.y 4 | ||
: ?. ''i*0f..; h - | : ?. ''i*0f..; h - | ||
t | t | ||
'P | 'P | ||
?! 4[(',f, - h' .. | ?! 4[(',f, - h' .. | ||
,>, I- b: | ,>, I- b: | ||
.? . 'i , | .? . 'i , | ||
; c. | ; c. | ||
hi | hi | ||
: r. .. | : r. .. | ||
s e3 9 '; f.;, | s e3 9 '; f.;, | ||
;, | ;, | ||
. i } ' | . i } ' | ||
] Q. | ] Q. | ||
;I, . *- d. | ;I, . *- d. | ||
a k'a?!hY,'q .1 l& | a k'a?!hY,'q .1 l& | ||
.W | .W | ||
?4 g ,. e;. | ?4 g ,. e;. | ||
PD T-1037 PDT- 1039 | PD T-1037 PDT- 1039 | ||
~ | ~ | ||
Figure 2 Close-up view of welds which showed liquid penetrant indications. | Figure 2 Close-up view of welds which showed liquid penetrant indications. | ||
'l l | 'l l | ||
l | l l | ||
l r-wn-y - .,-,w-. , . , . - . . ~ . - . . . - , -.,----w,--.- . . - ,,-,e- , , - . -_ _ _ - . . , - - . . , _ . _ _ _ _ ._,.ewm-m_ memtwe | |||
r-wn-y - .,-,w-. , . , . - . . ~ . - . . . - , -.,----w,--.- . . - ,,-,e- , , - . -_ _ _ - . . , - - . . , _ . _ _ _ _ ._,.ewm-m_ memtwe | |||
r~ | r~ | ||
-j,. | -j,. | ||
0 | 0 | ||
: l l' | |||
: l | |||
' | |||
l l | l l | ||
l | |||
\ | \ | ||
s ni l | s ni l | ||
l . . | l . . | ||
I s | I s | ||
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: l. 4 f:04[4 | |||
: l. 4 | |||
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.s | .s | ||
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y . | y . | ||
;,t . | ;,t . | ||
! ! . .I . .,. | ! ! . .I . .,. | ||
;_,_ i. | ;_,_ i. | ||
i Electrolytic Oxalic Etch 5X Figure 3 A longitudinal section of Instrument Line PDT-1039 i | |||
6 b | |||
i Electrolytic Oxalic Etch 5X | |||
Figure 3 A longitudinal section of Instrument Line PDT-1039 i | |||
4 r- | 4 r- | ||
- sem | - sem | ||
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l H!?s | l H!?s | ||
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?}%':1 ,5) | ?}%':1 ,5) | ||
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:' - 'w$6g{$v.egwg[p M e .r.: | :' - 'w$6g{$v.egwg[p M e .r.: | ||
f w, si. y | f w, si. y | ||
^ | ^ | ||
' ... fi W t-T .5 M y $'?2kh {$y h1p6ip ' 3' '3'i6p h G)j l 4.h$Q,'d..kshfr.k.,,fgQ3%.7 4x | ' ... fi W t-T .5 M y $'?2kh {$y h1p6ip ' 3' '3'i6p h G)j l 4.h$Q,'d..kshfr.k.,,fgQ3%.7 4x | ||
~ | ~ | ||
.s Q.'i.9$lJi | .s Q.'i.9$lJi l | ||
l | |||
;:M.'w. h $-.vn. .h | ;:M.'w. h $-.vn. .h | ||
-l '(.h):-)N%. | -l '(.h):-)N%. | ||
..n | ..n | ||
%; 'P) .y}p;gg;;byw! | %; 'P) .y}p;gg;;byw! | ||
'r W'gg', | 'r W'gg', | ||
m: | m: | ||
. f' . y,Ngt;y.q- y H 'kh.h \ | . f' . y,Ngt;y.q- y H 'kh.h \ | ||
-i ffsikN kAl I | -i ffsikN kAl I | ||
/ % E s sii845bsh Electrolytic Oxalic Etch 100 X W M[ $55ffh ll t | / % E s sii845bsh Electrolytic Oxalic Etch 100 X W M[ $55ffh ll t | ||
I (a) PDT-1037 | I (a) PDT-1037 | ||
.l | .l | ||
: 4. '7, g.f::: ~ ' .b ' | : 4. '7, g.f::: ~ ' .b ' | ||
w,Qt., 41.Jh4"'$ .x % . .;. . ' .., | w,Qt., 41.Jh4"'$ .x % . .;. . ' .., | ||
.,,t L/;1; SE h :*: i Th@y.[. is W h(,$.?-@%7}!$.. , | |||
.,,t | |||
L/;1; SE h :*: i | |||
Th@y.[. is W h(,$.?-@%7}!$.. , | |||
. jQ. W . l,- | . jQ. W . l,- | ||
.p; . | .p; . | ||
- 'I | - 'I | ||
~ | ~ | ||
Wi"hJ ;. u rs. . . | Wi"hJ ;. u rs. . . | ||
if4N, ? - | if4N, ? - | ||
..s.: | ..s.: | ||
f ti,,g%cc b.,c(Db y@'? a f.,( d,N.Y.q"! | f ti,,g%cc b.,c(Db y@'? a f.,( d,N.Y.q"! | ||
gy. | gy. | ||
d?, .! [h'j | d?, .! [h'j 3 | ||
3 | |||
$5' | $5' | ||
, 'I Electrolytic Oxalic Etch 100 X (b) PDT-1039 | , 'I Electrolytic Oxalic Etch 100 X (b) PDT-1039 | ||
| Line 634: | Line 320: | ||
\ | \ | ||
indications shown in figure 2. | indications shown in figure 2. | ||
b e - e. ,- | b e - e. ,- | ||
- - - - , , _ , - ,.-,,e- - ,,-,,.--.we-o. .ny..wr,-.- --,.r.-.rweww.--mew}} | - - - - , , _ , - ,.-,,e- - ,,-,,.--.we-o. .ny..wr,-.- --,.r.-.rweww.--mew}} | ||
Revision as of 00:38, 1 February 2020
| ML19326B692 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 03/04/1975 |
| From: | ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19326B689 | List: |
| References | |
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| Download: ML19326B692 (7) | |
Text
{{#Wiki_filter:. ,. - . - .. , . . . - - . .. r J. * , p , .
,4j , f .
(/ -1.: TAbnormal= Occurrence Repo'rt No. ~-50-313/74-12A-
?2. . Report Dato: '3. Occurrence Date: 11/9/74
;4.- Facility: Arkansas Nuclear One-Unit 1 i
Russellville,' Arkansas S.- Identification'of Occurrence: -
. PDT-103S,' PDT-1037, and PT 1039 Reactor Protection System (RPS) instrument'line. socket-weld failure.
M 6.. Conditions Prior to' Occurrence: - Steady-State Power Reactor Power 'O FlWth - llot Standby Not Output 0 h!Ne
. Cold Shutdown- X Percent of Full Power 0 %
Refueling Shut'down Load Changes During Routine.
. Power Operation
,Routinc Startup Operation-Routine Shutdown -'
} Operation
.' Other '(specify) s-s-
f
- 7. Description of Occurrence:
4
- See Abnormal Occurrence Report 50-313/74-12.
1 i :: ? *
- p. .
L u (~'N ' s o 04170[3[ .
. A+-
~ Mareh 4,.1975 1NSP-10, Rev.r2'. : Page 2 of 4
\'
o
. ,a : .. ... z -
__-m..-.._.._..- _.~_-.m..- .- . _ . . - - - . -
3
- y; ~ - .-
. s,
~
( t 5 (~Nt
~~
5 Abnormal Occurrence Report .No. 50-313/74-12A
- . ;
- 8. - -Designation of Apparent Cause of Occurrence:
Desi~ng Procedure bhndfacture Unusual Service Condition _ Installation / X Construction- Component Failure Operator Other ;(specify) -
- 9. Analysis of Occurrence:
Two instrument line samples each containing a weld which showed liquid penetrant: indications were subjected to metallurgical examination. Photographs of the samplesL are attached -(Figures 1 and 2). -Both samples Jwere~ sectioned to explore the cause of the examinations. Visual exam-ination of longitudinal sections prepared from the samples disclosed crsvices- open to the external surface at the locations of the liquid penetrant indications. An over-all view of the longitudinal section --
- sm
.from PDT-1039 is provided_in the attached Figure 3. The crevices of both samples are in the same relative position, that is, at the center of the weld face.
Examination at a higher magnification of the surface crevices (as shown 2
.in Figure 4). indicate that they are interdendritic shrinkage imperfec- ,
tions. These are limited in_depty to 0.009 and 0.034 inch for sample PDT-1037 and PDT-1039 respectively. , L I).
.bbrsh 4,1975 NSP-10, Rev._2 Page 3Of4 -
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~ Alniorma~1: Occurrence Rcport No. 313/7_4-12A-
;
I
. 210.1 Corrective ' Action:
- i
!? :- ! 1_ . . i W -
'[
- See 'AOR :50-313/74-12.c -!
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.. 1 s-- cNo;pr'iorJ failures of_this type, o
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- Figure 1 Instrument Line Sampics -
A) PDT-1039 - B) PDT 1037 -
*O e
49 - 9
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