ML19327B017
| ML19327B017 | |
| Person / Time | |
|---|---|
| Site: | Byron, Braidwood, 05000000 |
| Issue date: | 10/17/1989 |
| From: | Richter N COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 9001K, IEB-88-002, IEB-88-2, NUDOCS 8910240197 | |
| Download: ML19327B017 (2) | |
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^') Commonwealth Edison Fi
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1 72 West Adams Street, Chicago, Illinois (T
3( /: Addisssheply to: Post CEdiBoiD6T e,.' ' Nd ' Chicago, it'inois 00690 0767 y
i October 17, 1989 m
U.S. Nuclear Regulatory Commission
. Attn:
Document Control Desk Hashington, D.C.
20555
Subject:
Byron Station Units 1 and.2 Braidwood Station Units'I and 2 Supplemental Response to NRC Bulletin 88-02 NRC Docket Nos. 50-454/455 and 50-456/457
References:
(a) NRC Bulletin 88-02, dated February 5, 1988.
(b) W. Morgan (CECO) letter to A. Davis (NRC),
dated April 8.-1988.
(c) H. Morgan (CECO) letter to A. Davis (NRC),
I dated July 20, 1988.
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Dear Sir:
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Reference (a) requested that holders of operating licenses or j
construction permits for Hestinghouse designed nuclear power reactors with 1
steam generators having carbon steel. support plates implement actions to minimize the potential for a steam generator tube rupture event caused by a rapidly propagating fatigue crack such as occurred at North Anna Unit 1.
References (b) and (c) presented Commonwealth Edison's (Edison's) previous
. responses for Byron and Braidwood Stations to Reference (a). Subsequently, the NRC has requested confirmation that Edison's definition of denting is consistent with the definition provided in Reference (a).
This letter i
provides the response to that request.
During eddy current examinations of the steam generator tubes for 3
Byron Unit I and Braidwood Unit 1, the data is evaluated for evidence of i
denting as defined in Reference (a). As indicated in Reference (b), Byron Unit 2 and Braidwood Unit 2 have steam generator models which are not within i
the scope of Reference (a). At this time, it is Edison's understanding that I
1 no further information is required for closure of Reference (a) for Byron and Braidwood Stations.
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Please direct any questions that you may have on this response to
~this office.
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1 Respectfully, j
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M.H. Richter Generic Issues Administrator f
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A.B. Davis Resident Inspector BY/BH l
Subscribed and SupIn to lI.- -
5FFICILSEAL" beforp
_ his / /0 day LELIA F. MAYO Of fl
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' Notary M11c, State of Ullpoisll
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