ML19254E157
| ML19254E157 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 10/26/1979 |
| From: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML19254E154 | List: |
| References | |
| NUDOCS 7910310166 | |
| Download: ML19254E157 (2) | |
Text
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NUCLEAR REGULATORY COMMISSION y j )w g
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,o LICENSE:
CPPR 112 DOCKET:
50-410 CONTRACTOR: Stone and Webster Engineering Corporation FACILITY:
Nine Mile Point Unit 2
SUBJECT:
Non-Destructive Examination of Flued Head Penetration Welds
SUMMARY
OF MEETING HELD SEPTEMBER 7, 1979 On September 7,1979 representatives of the Stone and Webster Engineering "orporation and the Niagara Mohawk Power Corporation met with NRC f!egion I at King of Prussia, Pennsylvania to discuss non-destructive examination of flued head penetration welds. The meeting was held at NRC's request.
Representatives of the Stone and Webster (S&W) Engineering Corporation presented their position that substitution of UT for RT as the volumetric examination method for the subject welds is based upon an acceptable interpretation of the applicable ASME Code edition, that there is no deficiency in the S&W Specification, and that, therefore, no Part 21 evaluation is required in this regard. The results of the S&W evaluation of the two rejectable radiographic indications, revealed to date at Nine Mile Point, Unit 2, were discussed.
The S&W representatives stated that detemination had been made, based upon these results, that this was not currently reportable under Part 21, but that the evaluation continues and that an analysis of tne reportability i?quirements, as more information is received, will also continue.
A general discussion of the code commitments and the NDE requirements for the subject welds with regard to S&W plants across the country took place with emphasis upon those plants where S&W had decided to conduct RT.
Representatives of the NRC stated that both the Regulatory Guide 1.19 and the applicable ASME Code require radiography of the subject welds and that UT would be considered acceptable only after it was shown that meaningful results could not be obtained by RT. The fact that these welds had been successfully radiographed at other sites was mentioned, as well as the fact that welds at Nine Mile Point Unit 2 were found to have rejectable indications by RT subsequent to acceptance based on UT.
NRC representatives emphasized the urgency of this problem relative to those plants in o: ready for operation particularly with 1235 335 7910310/
' Staut LY,
regard to future RT results at Beaver Valley 2 as a possible indication of generic problems where so. face NDE of the subject welds alone had been accomplished.
S&W representatives indicated that the following information would be compiled and submitted to the NRC:
a.
Schedule for accomplishing the current evaluations at Nine Mile Point 2, Beaver Valley 2, Millstone 3 and River Bend projects.
b.
Copies of the slides presented by S&W at this meeting, which describe the current S&W procedures for evaluation and reporting under 10 CFR Part 21. These slides will be given to Niagara Mohawk Power Corporation for transmittal to the NRC.
c.
Clarification of the final disposition of the current Beaver Valley 2 Nonconformance and Disposition report written on this subject.
d.
Response to the suggestion made by NRC representatives that a UT examination be made of those welds that failed the RT examination to det.ennine if the missed indications were a result of faulty UT methods or the UT practice itself.
An NRC representative indicated thet the S&W decision not to currently report this issue under Part 21 would be reviewed further, as would the advisability of issuing an I&E Bu letin or Circular on this problem.
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