ML20040C271
| ML20040C271 | |
| Person / Time | |
|---|---|
| Site: | Fermi  |
| Issue date: | 01/11/1982 |
| From: | Wells D DETROIT EDISON CO. |
| To: | James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| References | |
| 10CFR-050.55E, 10CFR-50.55E, EF2-55873, NUDOCS 8201270476 | |
| Download: ML20040C271 (1) | |
Text
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e Donald A. Wells g
Detroit WA"'
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memo Ec ison ?O00 Se~ond A.em.e==a-t-.mnmeerd a c2 ucC17W8 7
r/:r g aa January 11, 1982 EF2-55873 h., _., Qf e
Mr. James G. Keppler, Director Region III U.S. Nuclear Regulatory Cm mission 799 Roosevelt Road Glen Ellyn, Illinois 60137
Subject:
Final Report of 10CFR50.55(e) Item on Transversing In-Core Probe System Problem (#36)
Dear Mr. Keppler:
This is Detroit Edison's final report on the Transversing In-Core Probe Sys-tem problem. The problem was originally reported to Mr. R. Knop of NRC-Region III by Detroit Edison's Mr. H.A. Walker, Supervisor - Construction Quality Assurance, on December 29, 1980.
At that tine, Engineering investigation indicated that the transversing in-core probe instrument tubing was possibly deficient. This determination was made by Project Design and Field Engineering while doing a design anal-ysis of the thermal movements associated with the primary containment liner during a loss of coolant accident (IDCA). The Detroit Edison Engineering Research Department mocked up the existing design, and nrformed tests J
based on the thenral movement associated with a IDCA.
The results of these tests bi Edison Design Engineering to conclude that the present design of TIP <pide tubes and their support is satisfactory, and will withstand the EF2 design basis accident without ccmpromising safe-ty.
(Three tubes passed the test with no leak, and one tube leaked at the flare joint at h-inch displacement; the leak was extremely stra11. No tub-ing wall failures were experienced.)
If you have questions concerning this tratter, please contact Mr. H.A. Walker, Supervisor - Construction Quality Assurance.
Very tnily yours,
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Mr. Victor Stello, Jr., Director Office of Inspection and Enforcenent Division of Reactor Inspection Progra:rs U.S. Nuclear Regulatory Cormtission Washington, D.C.
20555 Mr. Bruce Little, Resident Inspector U.S. Nuclear Regulatory Ca mission Resident Inspector's Office 6450 North Dixie Highway 82012/0476 G20111 DRADOCK05000g Newport, Michigan 48166
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