ML20040C271

Final Deficiency Rept Re Transversing in-core Probe Sys Problem,Initially Reported on 801229.Test Results Conclude That Present Design of Guide Tubes & Support Is Satisfactory

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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Donald A. Wells g Detroit WA"' [ 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 Mr. James G. Keppler, Director e

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, andJ nrformed tests 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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DAW /HTM/pn ec: 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 Newport, Michigan 48166 DRADOCK05000g

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