ML19326B692: Difference between revisions
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5 Abnormal Occurrence Report .No. 50-313/74-12A | 5 Abnormal Occurrence Report .No. 50-313/74-12A | ||
- 8. - -Designation of Apparent Cause of Occurrence: | - 8. - -Designation of Apparent Cause of Occurrence: | ||
Desi~ng Procedure bhndfacture Unusual Service Condition | Desi~ng Procedure bhndfacture Unusual Service Condition | ||
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, , , 3s. .- | , , , 3s. .- | ||
:n - | :n - | ||
6 g . , | 6 g . , | ||
z;D , - , - | z;D , - , - | ||
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l:L - - | l:L - - | ||
~ 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: | ||
- i | - i | ||
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': .. ::t 3 h.b L,27 i . 3. . . ., . r . . . ,3 .y | ': .. ::t 3 h.b L,27 i . 3. . . ., . r . . . ,3 .y | ||
- Figure 1 Instrument Line Sampics - | - Figure 1 Instrument Line Sampics - | ||
A) PDT-1039 - | A) PDT-1039 - | ||
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: l. 4 f:04[4 | : l. 4 f:04[4 | ||
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Revision as of 18:06, 18 February 2020
| ML19326B692 | |
| Person / Time | |
|---|---|
| Site: | Arkansas Nuclear  |
| Issue date: | 03/04/1975 |
| From: | ARKANSAS POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML19326B689 | List: |
| References | |
| NUDOCS 8004170531 | |
| Download: ML19326B692 (7) | |
Text
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(/ -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-
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- 7. Description of Occurrence:
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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 --
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.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).
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Figure 2 Close-up view of welds which showed liquid penetrant indications. 'l l l l l r-wn-y - .,-,w-. , . , . - . . ~ . - . . . - , -.,----w,--.- . . - ,,-,e- , , - . -_ _ _ - . . , - - . . , _ . _ _ _ _ ._,.ewm-m_ memtwe
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