IR 05000410/1979002
| ML17053B218 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 10/24/1979 |
| From: | Robert Carlson NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| To: | Rhode G NIAGARA MOHAWK POWER CORP. |
| Shared Package | |
| ML17053B219 | List: |
| References | |
| NUDOCS 7911230071 | |
| Download: ML17053B218 (2) | |
Text
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UNITED STATES NUCLEAR REGULATORY COMMISSION
REGION I
631 PARK AVENUE KING OF PRUSSIA, PENNSYLVANIA19406 OCr a4 IS>9 Niagara Mohawk Power Corporation ATTN:
Mr. G.
K. Rhode Vice President System Project Management 300 Erie Boulevard, West Syracuse, New York 13202 Gentlemen:
Subject:
Inspection 50-410/79-02 This refers to your letter dated June 28, 1979, and our response letter dated July 20, 1979.
It is our understanding that radiography of the subject flued head to outer sleeve welds has revealed rejectable indications in a number of the penetration assemblies.
Repr esentatives of the Stone and Webster Engineering Corporation have indicated that improper UT techniques and/or application are primarily I responsible for the failure to.have previously identified such nonconforming conditions.
Discussions between our inspectors and your staff during recent
.
inspections have emphasized the need to precisely determine the factors contributing to this failure, so that any generic implications can be assessed.
Based upon the assertion that for this weld design, ultrasonic examination in lieu of radiographic examination is the more meaningful and the preferred method, a
demonstration that proper UT would have correctly identified and rejected the nonconforming welds is desirable.
We request that an additional ultrasonic examination be accomplished on a weld that failed the radiographic examination to provide evidence as to the effectiveness of UT as a volumetric examination method on the subject welds.
Notification, so that we may witness the conduct of this additional UT, is also requested.
It is our understanding that at least one penetration (Z19) is not scheduled for repair within such time that compliance with our request would cause a delay.
Your cooperation with us is appreciated.
Sincerely, CC:
Eugene B. Thomas, Jr., Esquire R. T. Carlson, Chief Reactor Construction and Engineering Support Branch