ML20136J087
| ML20136J087 | |
| Person / Time | |
|---|---|
| Site: | Braidwood  |
| Issue date: | 03/27/1985 |
| From: | Danni Smith COMMONWEALTH EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| Shared Package | |
| ML20136J064 | List: |
| References | |
| 9930N, NUDOCS 8511250279 | |
| Download: ML20136J087 (3) | |
Text
.
- e
.~
Commonwealth Edison one First National Plaz7, Chicago, Illinois Adoress Reply to: Post Office Box 767 Chicago, Ilknois 60690 March 27, 1985 Mr. James G. Keppler, Regional Administrator U.S. Nuclear Regulatory Commission Region III 799 Roosevelt Road Glen Ellyn, IL 60137
Subject:
Braidwood Nuclear Power Station Units 1 & 2 Revision to Inspection Report 83-09 Response NRC Docket Nos. 50-456 and 50-457 Reference (a):
D. H.
Smith letter to J. G. Keppler dated March 11, 1985
Dear Mr. Keppler:
Reference (a), submitted for NRC review, is Commonwealth Edison Company's proposed HVAC Weld Testing Program which should demonstrate positive confirmation of weld adequacy.
The specifics of the program were discussed with Mr. John Jacobson of your staff on February 26, 1985 and revisions were made based on thls discussion.
The NRC has reviewed the submitted program and requested a change to Item D.l.
In lieu of NRC " sign-of f for acceptance" of sample selection and test results the program now cites a " review for acceptability".
The new Item D.1 reads as follows:
D.
NRC Concurrence 1.
The assigned NRC Inspector will review for acceptability, sample selection and test results on an as-completed basis.
A copy of the HVAC Weld Testing Program is attached.
If you have any questions concerning this matter, please contact this office.
VEry truly yours, B511250279 840831 W
gDR ADOCK 05000 56 David H.
Smith Nuclear Licensing Administrator bs cc:
NRC Resident Inspector - Braidwood 9930N gag 2 91985 L
a
o ATTACHMENT HVAC WELD TESTING PROGRAM A.
Sample Selection Criteria 1.
Sample size will be a minimum of 75 safety related field inspected and accepted welds made prior to September 15, 1983.
2.
Each of the following types of welds will be included in the sample population:
I a.
Welds that were considered acceptable without rework
)
during the 100% reinspection effort.
b.
Welds made by welders having high reject rates.
c.
Welds that have troublesome weld configurations or special weld configurations.
d.
Welds for which fitup can not be determined after i
welding, including angle splices.
l e.
Multi-pass welds.
l f.
Welds from among the highly stressed connections.
g.
Welds made from all processes other than the silicon-bronze process (the silicon-bronze process will be addressed separately).
h.
Sheet to sheet welds J.
Structure to structure welds.
3.
In some cases, multiple welds may be selected from a single component, provided the other selection criteria are met.
4.
In some cases, welds will be selected from locations for which welder identification can not be verified.
This data will be utilized to add confidence to the acceptability of welds of this type.
5.
In some cases, welds will be selected which had minor defects that had been accepted-as-is by the Architect / Engineer.
This data will be utilized to add confidence to the acceptability of welds of this type.
6.
If only a portion of a specific weld is tested, it will be confirmed that the sample is representative of the entire weld.
B.
Testing 1.
Testing will be performed which is appropriate for the nature of eact weld sample, such as a tensile test, l
micro-etching, bend test, non-destructive examination, etc.
2.
Testing for a portion of the sample population may be accomplished by static loading of an assembly to equivalent design loads.
[
>G'
[
C.
Acceptance Criteria 1.
Acceptance criteria for each weld tested will be based on design requirements.
D.
NRC Concurrence
'l.
The assigned NRC' Inspector will review for acceptability, sample selection and test results on an as-completed basis.
9930N i
L-