NRC-89-0164, Responds to Generic Ltr 89-08, Erosion Corrosion-Induced Pipe Wall Thinning. Long-term Erosion/Corrosion Program Implemented to Provide Assurance That Structural Integrity of High Energy Carbon Steel Sys Maintained
| ML20247H547 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 07/21/1989 |
| From: | Sylvia B DETROIT EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| CON-NRC-89-0164, CON-NRC-89-164 GL-89-08, GL-89-8, NUDOCS 8907310060 | |
| Download: ML20247H547 (3) | |
Text
_ _________________________ _ __-_ - __
- 0. R0lph Sylvia
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Senior wce President Detroit Ec ison t=;9""**
July 21,1989 NIC-89-0164 U. S. Ibclear Regulatory Ccxumission Attn: Document Control Desk Washington, D. C.
20555
References:
1)
Fermi 2 NIC Docket No. 50-341 NIC License No. NPF-43 2)
NIC Generic Letter No. 89-08,
" Erosion Corrossion-Induced Pipe Wall Thinning", dated May 2, 1989
Subject:
Egsponse to N1C Generic Letter 89-08 This letter is to provide Detroit B3ison's response to NIC Generic Letter 89-08 (Reference 2) which was received on May 22, 1989. The Generic Letter 89-08 requested us to provide assurances that a program, consisting of systematic measures to ensure that erosion / corrosion does not lead to degrMation of single phase and two-phase high-energy carbon steel systems, has been implemented at Fermi 2.
Our response to the Generic Letter 89-08 is given below.
Detroit Edison has implemented a long term Erosion / Corrosion (E/C)
Program that provides assurance that the structural integrity of all high energy (single-phase and two-phase) carbon steel syste:rs is maintained. This is administratively controlled through procedure NEP-CT1-01, " Erosion / Corrosion Prediction, Detection, and Correction." The procedure prescribes the Fermi 2 program for predicting areas where carbon and localloy steel piping are nost susceptible to damage caused by high--energy single-phase, wet steam, and flashing flow E/C. Implementation of the F/C program predictive analysis is documentM in Design Calculation 4947.
The first examinations of piping for E/C damage were completed during the March 1988 LLRT Outage. These examinations were completM only two (2) months after achieving commercial operation. Seventy-eight (78) components were selected for examination based on the Detroit Edison analysis and review of operating experience reports from other plants. A larger nanber of components have been selectM for l
examination during the fall 1989 first refueling outage, including all l
of those initially selected in 1988.
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. July 21, 1989
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NBC-89-0164-Page 2
'Ibe scope of future. examinations will depend on results for these ccmponents from the first refueling outage examinations and ' input from.
future industry operating experience reports which will be reviewed for applicability to Fermi 2. t Detroit Edison is ccumitted to..
following this industry issue programmatically and. has initiated the administrative controls to ensure the program's long term success.
If you have any further questions, please contact Mr. Girija Shukla at (313) 506-4270.
Sincerely, at cc:
A. B. Davis R. C. Knop.
W. G. Rogers J. F. Stang l
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. pstac July 21; 1989~
10C-89-0164 Page 3
' I, B. RALPH SYLVIA, do hereby affirm that the-foregoing statenents are-based on facts and circumstances which are true and accurate to the best of my knowledge-and belief.
Y E RAL141 Senior Vi President-On this N
day of
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b-
. 1989, before me personally appeared B. Ralph Sylvffit, bdng first duly. sworn and says -
1 that he executed the foregoing as his free act and deed.
.j i
1
/
I Notary Public.
I ROSAUE A. ARME1TA
-l Notary Pub!!c, Monroe County,M '
WCornrnissionExp!resJan.11,19e
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