ML20023C672
| ML20023C672 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 05/06/1983 |
| From: | Wells D DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, EF2-63503, NUDOCS 8305170535 | |
| Download: ML20023C672 (2) | |
Text
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So+1 Donald A. Wells vrag*ouaav Asvec+
G13: 237 W 7 2000 Second Avenue lSOn Detroit, Michigan 48226 (aia) 237-e May 6, 1983 EF2-63503 Mr. James G. Keppler, Regional Administrator Region III U.S. Nuclear Regulatory Catmission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Subject:
Report of Potential 10CFR50.55(e) Item on Residual Heat Removal (RHR) Heat Exchanger Flow Deficiency (#93)
Dear Mr. Keppler:
On April 6, 1983, Detroit Edison's Mr. D. Ferencz, Acting Supervisor -
Construction Quality Assurance, telephoned Mr. H.M. Wescott of NRC Region III to report on a potential problan with RHR heat exchanger flow defi-ciencies at the Fermi 2 site.
An error in calculation may have been made by General Electric resulting in a flow deficiency. The design flow should be ten thousand (10,000) GPM, but was actually calculated to be seven thousand seven hundred (7,700) GPM.
General Electric has performed an evaluation of the flow deficiency of the North and South heat exchangers. General Electric recalculated the flow, and concluded that to achieve the required design flow of ten thousand (10,000) GPM, the lower baffle plates of the heat exchangers required modification and rework.
Under the direction of General Electric, Wismer and Becker performed a mock up of the modification and rework of the baffle plates to assure that the work could be safely performed without damage to the heat exchangers.
General Electric was satisfied with the work performed during the neck up, and the contractor proceeded with the nodification and rework.
The contractor has completed the modification work on the baffle plates, and is re-installing piping for the systan. Evaluation of the design flow will be conducted after testing of these systans is completed.
Another report on this item, either interint or final, will be sent when further information is available. If you have questions concerning this matter, please contact Mr. G.M. Trahey, Assistant Director - Project Quality Assurance.
Very truly yours, I/ w DAW /
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8305170535 830506 9@
PDR ADOCK 05000341 MM s
Mr. James G. Keppler, Regional Administrator May 6, 1983 Page Two EF2-63503 cc: Mr. Richard DeYoung, Director Office of Inspection and Enforcement U.S. Nuclear Regulatory Comission i
Washington, D.C.
20555 Mr. B.H. Little, Senior Resident Inspector U.S. Nuclear Regulatory Cemnission 6450 North Dixie Highway t
Newport, Michigan 48166 s
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