ML20132A674
| ML20132A674 | |
| Person / Time | |
|---|---|
| Site: | Vogtle  |
| Issue date: | 05/07/1985 |
| From: | Blake J, Newsome R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| Shared Package | |
| ML20132A678 | List: |
| References | |
| 50-424-85-18, 50-425-85-18, NUDOCS 8507230173 | |
| Download: ML20132A674 (2) | |
See also: IR 05000424/1985018
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NUCLEAR REGULATORY COMMISSION
UNITED STATES
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REGloN 11
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101 MARIETTA STREET, N.W.
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ATLANTA, GEORGI A 30323
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Report Nos.:
50-424/85-18 and 50-425/85-18
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Licensee: Georgia Power Company
P. O. Box 4545
Atlanta, GA 30302
Docket Nos.:
50-424 and 50-425
License Nos.: CPPR-108 and CPPR-109
Facility Name:
Vogtle 1 and 2
Inspection Conducted: May 1, 1985
Inspector:
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Date Signed
Approved by.
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J/ . Blake, Section Chief
Date Signed
in neering Branch
di ision of Reactor Safety
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SUMMARY
Scope: On May 1,1985, a technical meeting was held with Georgia Power Company
(GPC) and Southern Company Services (SCS) representatives in the Region II Office
for the purpose of providing GPC an opportunity to demonstrate the capability of
their ultrasonic examination procedure and equipment to detect actual flaws and
artificial reflectors in Region II's Centrifugally Cast Stainless Steel (CCSS)
test specimens. GPC was successful in detecting the I.D. reflectors, including
cracks.
Region II's CCSS test specimens represented examination conditions
similar to those that GPC will experience during the examination of the Vogtle
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facility stainless steel reactor coolant loop piping. Therefore, GPC's proce-
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dure, and ultrasonic equipment have demonstrated conservative detection
capability for the preservice examination at the Vogtle facility.
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8507230173 850508
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REPORT DETAILS
1.
Persons Contacted
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Licensee Employee - Georgia Power Company (GPC)
J. A. Edwards, Senior Regulatory Specialist
Other Organization - Southern Company Services (SCS)
T. N. Epps, Manager, SCS Inspection, Testing and Engineering (ITE)
J. M. Davis, NDE Supervisor Level III, SCS
A. Maze, NDE Level III Senior Inspector, SCS
2.
Technical Issues Involved
GPC and SCS personnel identified in paragraph I above, visited the Region II
Office on May 1,1985, to demonstrate the capability of their ultrasonic
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examination procedure and equipment to detect, locate, and size actual crack
flaws propagating from the pipe inside diameter in Centrifugally Cast
Stainless Steel (CCSS) using a refracted longitudinal wave transducer.
The
refracted longitudinal wave transducer currently is the only practical
(VA)
method of inspecting difficult-to penetrate weld volumes and most cast
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stainless steels.
However, the refracted longitudinal wave mode suffers
significant mode conversion when interfacing with corner type reflectors
such as I.D. pipe cracks. Therefore, GPC wanted to test their procedure and
equipment detection capability prior to the start of their preservice
baseline examinations at the Vogtle Unit 1 facility.
Region II provided the CCSS specimens for the GPC performance demonstration
test.
All cracks and artificial reflectors were concealed so that the
licensee had no prior knowledge of their location. GPC used a Krautkramer-
Branson USL-38 instrument and dual 1 MHz by one inch trensducers.
The
transducers had lucite wedges ground to fit the contour of the reactor
coolant loop piping and were designed such that the ultrasonic sound beam
was focused at a specific metal path distance.
SCS performed the actual examination of the test specimen and Region II
personnel provided guidance and monitored the ultrasonic instrument calibra-
tion and subsequent crack detection techniques used by the participants.
After the participants had completed the examination of the weld sample, the
I.D. cracks were revealed to the licensee by-removing the masking material
and performing a liquid penetrant test on the sample.
3.
Meeting Conclusions
During the technical meeting at the Region II Office, GPC successfully
demonstrated the capability of their ultrasonic examination procedure and
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equipment to detect actual flaws in the volume subject to examination.
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