ML19326B692
| 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) | |
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-1.: TAbnormal= Occurrence Repo'rt No.
~-50-313/74-12A-
?2.. Report Dato:
'3.
Occurrence Date:
11/9/74
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Facility:
Arkansas Nuclear One-Unit 1 Russellville,' Arkansas i
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Identification'of Occurrence:
. PDT-103S,' PDT-1037, and PT 1039 Reactor Protection System (RPS) instrument'line. socket-weld failure.
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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
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Operation
.' Other '(specify) s-s-
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Description of Occurrence:
- See Abnormal Occurrence Report 50-313/74-12.
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- 8. - -Designation of Apparent Cause of Occurrence:
Desi~n Procedure g
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.
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both samples are in the same relative position, that is, at the center of the weld face.
2 Examination at a higher magnification of the surface crevices (as shown
.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.
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- Figure 1 Instrument Line Sampics A) PDT-1039 B) PDT 1037
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Figure 2 Close-up view of welds which showed liquid penetrant indications.
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Figure 4 Micrographs of the weld sections through the
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