ML20044A951

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Advises of Westinghouse Reassessment of Portion of Analysis to Address Issue of Rapidly Propagating Fatigue Cracks in Steam Generator Tubes Per Bulletin 88-002
ML20044A951
Person / Time
Site: Zion File:ZionSolutions icon.png
Issue date: 07/10/1990
From: Taylor D
COMMONWEALTH EDISON CO.
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-88-002, IEB-88-2, NUDOCS 9007170054
Download: ML20044A951 (2)


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r July 10, 1990 U.S. Nuclear Regulatory Commission

ATTN:. Document Control Desk Hashington, D.C.

20555

Subject:

Hestinghouse Reassessment of Bulletin 88-02 for Zion Station, Unit 1 BC Docket,flo. 50-295

References:

(a) NRC Bulletin 88-02, dated February 5,1988.

.(b)'H.E. Morgan letter to A.B. Davis dated April 8, 1988.

(c) H.E. Morgan letter to Document Control Desk dated May 13, 1988.

(d) C.P. Patel letter T.J. Kovach dated February 6, 1990.

(e) C.P. Patel letter to T.J. Kovach

. dated June C, 1990.

Dear Sir:

Hestir.p.ouse has performed an analysis to address the issue of -

rapidly propagating fatique' tracks in steam generator tubes in resDonse to Bulletin 88-02, Reference (a), fcr Zion Station Unit ~l.

A Safety Evaluation Report (SER) was issued for this analysis, Reference (d).

Subsequent to the issuance of, the Zion Unit 1 analysis SER,' Hestinghouse informed the NRC of its-

-intent to reassess a portion-of the'ana'ysis in question.

Reference (e) requested, therefore, that Zion Station Unit i recommit

.to Item C.1 of Reference (a), an enhanced primary to secondary-leak rate

. monitoring. program, until completion of the Hestinghouse reassessment and

staff review of that reassessment.

Zion-Station Unit I has implemented and continues to utilize an enhanced primary to secondary leak rate monitoring-program as described in Reference (b) and Reference (c).

This progran,has been ongoing at Zion Station since March of 1988, and fulfills the requirements of Item C.1 or Reference (e).

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U.S; NRC July 10 1990 j;oo.

i Further, Zion Station Unit I will continue to utilize:this enhanced.

4 primary to secondary leak rate monitoring program until the completion of the t

Westinghouse reassessment and its subsequent review by the. staff,.

Please address any questions that you or your staff may have regarding this! response to this office.

Respectfully,-

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D.L. Tailor Generic Issues Administrator

- cc:

A.B.. Davis - Regional Administrator, RIII l

C.P. Patel - Project Manager, NRR

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