ML20094B140
| ML20094B140 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 11/02/1984 |
| From: | Danni Smith COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 8413N, 9413N, NUDOCS 8411070036 | |
| Download: ML20094B140 (2) | |
Text
,
7 Conunonwealth Edison 3.,.'
-/
' ) One First NI,tional Plaza. Chicago, Illinois O'
. Address Reply to: Post Office Box 767
'A Chicago. lltinois 60690 November 2, 1984 Mr.-Harold R. Denton, Director Office;of Nuclear Reactor Regulation U.S.: Nuclear Regulatory-Commission
' Washington,.D.C. 20555 Sub ject:
Byron Generating Station Units 1 and 2 Braidwood Generating Station' Units 1 and 2 ASME Code Case N-340 NRC Docket Nos. 50-454, 50-455, 50-456,
.and 50-457' References (a): Jr. R. Tramm letter to'H. R. Denton
~
' dated March 2, 1983 (b):
B. J. Youngblood letter to D. L. Farrar dated May 3, 1983 F
Dear Mr. Denton:
Reference.(a) informed you of our intent to utilize. ASME
/ Code Case-N-340 at our Byron and Braidwood generating stations and re' quested acknowledgement of its acceptability.
This code case, iwhich was approved by ASME on June-17, 1982,. provides alternate rules for examination of weld-eoge preparation and ultrasonic examination
.of-a completed weld.
Reference (b) Informed us that the code case was not acceptable for generic: use.
It-was indicated however, that codefcase use:would be acceptable if the reason.for not performing 1
o
- edge -examinations in accordance with the' Code and justificaticn for L
applying the Code Case was explained.
The purpose of this-letter is L
toLsupplement our prior request for NRC acknowledgement of_ Code Case j
! acceptability with-the required information.
g I
Braidwood Station LUse of the. subject code case is documented on Commonwealth c
, Edison Company NCR-L272.
Four primary loop weld edge preps were not L
liquid penetrant tested prior to welding.
This condition was not C
, observed until approximately 1/2 o f.the weld ' metal. was deposited.
- The corrective action required that'all-remaining accessible. surface be: liquid ~ penetrant examined, all partial welds be ultrasonic. tested Efromethe inside, and all finalLwelds be ultrasonically and radiographically examined.
The corrective action exceeded the requirements set.forth by ~ the -sub ject Code Case.
Use of the Code Case eliminated the need for extensive repairs and-the consequent possibility of stainless steel sensitization.
l N ohm 4 PDR '
Gn.
...e Byron Station The. subject Code Case has not been used at our Byron One signed original and fifteen copies of this letter are enclosed for your use.
Please address any questions concerning this matter to this. office, ytruly7>furs, Wh$1 David H. Smith cc:
-J.
G. Keppler - RIII RIII Inspectors -. Byron /Braidwood 9413N 4