ML20093E764

Interim Part 21 & Deficiency Rept Re Boeing Steam Generator Snubber Failure Due to High Pressure Metallic Seal Nonconformity.Initially Reported on 840731.First Rebuilt Unit to Be Tested Approx 841005

ML20093E764
Person / Time
Site:	Byron, Braidwood, 05000000
Issue date:	09/26/1984
From:	Swartz E COMMONWEALTH EDISON CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
REF-PT21-84-523-000 84-05, 84-11, 84-5, 9241N, PT21-84-523, PT21-84-523-000, NUDOCS 8410120248
Download: ML20093E764 (2)

Text

U. V pg 0 i ). one First National Plaz9. Chicago. Ihnow I- ( 7 Address Reply 12 Post Othca Box 767 x / Chicago, tilinois 60690 September 26, 1984 Mr. James G.-Keppler Regional Administrator I.S.

U Nuclear Regulatory-Commission Region III-799 Roosevelt. Road Glen Ellyn, IL 60137 Sub ject : Byron Station Units 1 and 2 Braidwood Station Units 1 and 2 10 CFR 50.55(e) Interim Report.

Steam Generator Snubber Failure NRC Docket Nos. 50-454/455 and 50-456/457 References (a): E. D. Swartz letter to J. G. Keppler dated July 31, 1984 (b): 0. R. Sanders letter to R. A. Salsbury dated September 10, 1984

Dear Mr. Keppler:

On June 28, 1984, the Commonwealth Edison Company riotified your office of a deficiency reportable pursuant to 10 CFR 50.55(e) concerning the unsatisfactory operation during confirmatory testing of the Steam Generator Snubbers supplied by the Boeing Company for our Byron and Braidwood Stations. For your tracking purposes, this deficiency was assigned number 84 .05 for Byron ~ Station and number 84-11 for Braidwood Station. Reference (a) provided the thirty day report concerning this matter. The purpose of this letter is to provide the status update.

STATUS OF RESOLUTION The Boeing Engineering Company Southeast, Inc. has completed a i

preliminary analysis of the dimensional non-conformances of the high pressure metallic seals as observed and documented by ITT Grinnell in Report Nos. FSE-789 and FSE-813 for snubber serial numbers 1, 6, 10, 13, 19, 23 and 25. As indicated in Reference (b), Boeing Company has decided to withhold any statement concerning the results of their metallic seal review until such time as they can perform their own re-inspection and analysis of several of the' worst-case seals. To accommodate this effort, the worst-case seals are being provided to the Boeing Company.

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The'Commonwea'lth-Edison Company has contracted ITT Grinnell to

. re-design and re-qualify: a limited number of. the Boeing snubbers to' accommodate our Byron Unit 1 fuel load requirements. We -

anticipate that the'first.re-built Steam, Generator Snubber will be functionally' tested 'by ITT Grinnell .in Warren, Ohio on or-about October 5,f l984.

We' will provide your office with a supplemental report in this matter upon completion of the Boeing Company analysis of the cause of snubber -seal leakage. We will continue to keep Mr. Isa T.

Yin informed of our activities associated with further Boeing snubber. testing. In the= interim, please address any questions that you or your staff may have concerning.this matter to this office.

Very truly your E. auglas Swart Nuclear Lid ng Administrator cc: I. T. Yin i RIII Resident Inspectors - By/Bw Director of Inspection and Enforcement US Nuclear Regulatory Commission Washington, DC 20555 9241N L

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