ML20085K223
| ML20085K223 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 06/21/1995 |
| From: | Benes G COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20085K225 | List: |
| References | |
| NUDOCS 9506230222 | |
| Download: ML20085K223 (2) | |
Text
._.....
Gunmonwealth Edium Company IW) Opus Place
,y
- Downers Grove. IL N) SIS June 21,.1995 U.S. Nuclear Regulatory Commission Attn:
Document Control Desk Washington, D.C.
20555
SUBJECT:
LaSalle County Nuclear Power Station Unit 1 Reactor Vessel Material Surveillance Program-Appendix H Facility Operating License NPF-11 NRC Docket 50-373
REFERENCE:
G. Benes letter to USNRC dated March 23, 1995 on the same subject.
t In accordance with Appendix H of 10 CFR 50, Commonwealth Edison Company (Comed) submitted the referenced document containing the General Electric report; GE-NE-523-A166-1294, DRF l
137-0010-7, LaSalle Unit 1 RPV Surveillance Materials Testina and l
Analysis, March 1995.
This letter submits Revision 1 to the General Electric report; GE-NE-523-A166-1294, DRF 137-0010-7, Revision 1, June 1995, LaSalle Unit 1 RPV Surveillance Materials Testina and Analysis.
Changes to the report have been made as the result of an error which was discovered in the surveillance specimen chemical analyses.
The changes in the Revision 1 report are marked with margin bars.
I' Due to industry focused attention on weld metal chemistry variability associated with ABB/CE fabricated reactor vessel welds, a review of the original General Electric report was performed.
This review revealed a systematic but conservative l
error in the GE chemical analyses.
The errors were conservative, in that the copper and nickel values obtained in the initial analyses were high as a result of providing faulty sample dilution factor inputs to the plasma spectrometer.
This resulted in the use of a higher (more conservative) chemistry factor than necessary for the LaSalle Unit 1 beltline weld and plate.
Despite this conservatively high
)
chemistry factor, it was determined that the existing LaSalle Unit 1 P-T curves remained acceptable for use.
Using the corrected chemistry factor, there is even more margin, and the existing LaSalle Unit 1 P-T curves do not need to be updated.
To the best of my knowledge and belief, the statements j
contained here are true and correct.
In some respect these l
statements are not based on my personal knowledge, but from obtained information furnished by other Commonwealth Edison employees, contractor employees, and consultants.
Such information has been reviewed in accordance with company practice, and I believe it to be reliable, f
230023 9506230222 950621 (g8q(
PDR ADDCK 05000373 P
PDR A ltnictmt Comp.m) l
7 i
USNRC (2)
June 21, 1995 We regret any inconvenience this error may have caused.
Please direct any questions you may have concerning this matter to this office.
Sincerely, fBW Gary G. Benes Nuclear Licensing Administrator
Attachment:
GE-NE-523-A166-1294, DRF 137-0010-7, Revision 1, June 1995, LaSalle Unit 1 RPV Surveillance Materials Testina and Analysis.
cc:
J. B. Martin, Regional Administrator - RIII P. G. Brochman, Senior Resident Inspector - LSCS W. D. Reckley, Project Manager, NRR Office of Nuclear Facility Safety - IDNS i
i I
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