IR 05000317/1993008
| ML20046A766 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 07/20/1993 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | |
| Shared Package | |
| ML20046A765 | List: |
| References | |
| 50-317-93-08, 50-317-93-8, 50-318-93-08, 50-318-93-8, NUDOCS 9307300024 | |
| Download: ML20046A766 (1) | |
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Inservice Inspection Data Ultrasonic examination data associated with safety injection system weld 6-ISI-2202-10, a 6"
diameter, stainless steel valve to pipe weld, was selected for inspection to ascertain that the
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examination was performed by qualified examiners, and that the data were properly recorded l
r and evaluated.
Examination access was limited to the pipe side because of the valve configuration. The
SWRI Profile and Thickness Information Record Sheet No. 135002, dated i
February 26,1993, was prepared to show the amount of coverage accomplished by the one side examination. The transducers were placed on the pipe side of the weld with sound
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transmission toward the valve side using the shear mode and entry angles of 45 and 60. A note on the profile sheet stated that "100% two directional coverage obtained from pipe side," however, the inside surface contour of the weld suggests that complete coverage of the weld was unlikely from only one side. A plot of the coverage constructed by the SWRI j
examiner appeared to confirm the coverage claimed by the note. A subsequent attempt by the NRC to confirm the claimed coverage using the EPRI developed RAYTRACE computer
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software suggested that portions of the required weld examination volume were not covered
by the ultrasound and that 100% coverage was not attained. The matter was discussed with cognizant licensee personnel. If it is found that less than 90% of the required volume can be.
t examined, a request for relief from the code requirement will be submitted to the NRC.
t Conclusion The Baltimore Gas & Electric Company (BG&E) oversight of ISI vendor activities shows a i
need for improvement as exemplified by the selection, by the vendor, of an inappropriate
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ultrasonic examination technique to evaluate defects originally detected by the magnetic
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particle method. A second example is the claim of 100% examination coverage of safety injection weld 6-SI-2202-10 by the vendor and accepted by BG&E. The weld profile
suggests that complete coverage was unlikely and an NRC attempt using the EPRI developed
RAYTRACE computer software to confirm that 100% coverage was attained showed that a j
portion of the required examination volume was not examined by the pipe side examination l'
documented by the ISI vendor. Further evidence of the need for improved BG&E involvement in vendor inservice inspection activities is the acceptance of incomplete l
qualification /ccrtification records of vendor nondestructive examination personnel who were l
responsible for performing inservice inspection at Calvert Cliffs.
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2.0 EXIT AIEETfNG The inspector met with licensee representatives, denoted in Attachment 1, at the conclusion of the inspection on March 19, 1993. The inspector summarized the scope and findings of the inspection.
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