IR 05000528/1993024
| ML20056E720 | |
| Person / Time | |
|---|---|
| Site: | Palo Verde  |
| Issue date: | 08/06/1993 |
| From: | Miller L NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V) |
| To: | |
| Shared Package | |
| ML20056E520 | List: |
| References | |
| 50-528-93-24, 50-529-93-24, 50-530-93-24, NUDOCS 9308250105 | |
| Download: ML20056E720 (1) | |
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corrosion ultrasonic test inspections and records, component evaluations (engineering evaluation reports), and corrective
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maintenance work orders. The NRC inspector found that the licensee had performed random quality assurance reviews of the erosion
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corrosion program in accordance with licensee in service inspection / inservice testing /special process module
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(ISI/IST/Special Process Module) Quality Monitoring Manual.
Personnel Interview and Review of Lamination Area Mao t
Interview The inspector interviewed the licensee erosion corrosion NDE UT thickness inspector who performed the examination which produced i
different results than the NRC NDE mobile laboratory inspectors.
l The licensee's NDE inspector did not recall noting any abnormal t
l wall thickness readings or. piping flaws during the inspection of
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interest. The NDE inspector also stated that he typically applied
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couplant, measured piping thickness by UT, and wiped off couplant
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on three lines of an inspection grid at a time, i
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The NDE inspector discussion of the UT pipe wall thickness l
measuring procedure and process that he utilized, indicated that he i
l was both knowledgeable and capable of performing the UT pipe wall l
thickness measuring procedure. The NDE inspector appeared credible l
l and convincing to the NRC inspector. In addition, reinspection of a
sample of his previous inspections confirmed the adequacy of those inspections. The NRC inspector concluded that the licensee i
inspector had performed the inspection in accordance with licensee
procedures and within the skills of a level II nondestructive test i
(NDT) inspector.
i lamination Mao Review i
The inspector reviewed the laminar indication mapped by the
t licensee. The inspector found that the lamination appeared in an area that included thirteen 3"x 3" grid inspection squares.
Each
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of the grid inspection squares indicated a portion of the (
lamination. The lamination was not detected in 100% of any one of the thirteen grid inspection squares.
In one of the thirteen 3"x l
3" grid inspection squares, the lamination covered approximately 90% of the square. This square had the largest area of recorded lamination. The remaining grid inspection squares varied from one at approximately 60% recorded lamination to the remaining eleven at
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approximately 5% to 40% recorded lamination within the grid l
inspection squares.
The inspector concluded that the licensee NDE UT inspector could have obtained the recorded thickness measurements in all of the grid inspection squares using licensee procedure, 73TI-0ZZO2, Revision 04.01, Ultrasonic Thickness Measurement.
The grid that was 90% occupied by the lamination would have necessitated
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9308250105 930806 PDR ADOCK 05000528 O
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