ML20206E042

Responds to NRC Bulletin 88-002, Rapidly Propagating Fatigue Cracks in Steam Generator Tubes. No Mods, Preventive Tube Plugging or Other Measures Necessary to Prevent facility-type Tube Rupture

ML20206E042
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	11/01/1988
From:	Cockfield D PORTLAND GENERAL ELECTRIC CO.
To:	Martin J NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION V)
References
IEB-88-002, IEB-88-2, NUDOCS 8811170370
Download: ML20206E042 (2)

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David W. Cockfield Vice President Nuclear t

November 1, 1988 l

Trojan Nucitar Plant Docket 50-344 1.icenso NPF-1 i

i Mr. John D. Martin Regional Administrator, Region V U.S. Nuclear Regulatory Commission 1450 Maria Lano, Suite 210 Walnut Creek CA 94596-5368

Dear Mr. Martin:

Nuclear Regulatory Commission (NRC)Bulletin 88-02, Rapidly Propage. ting Fatigue Cracks in Steam Cenerator Tubes NRC Bulletin 88-02 requested licenseos with Westinghosso-designed r,uclear i

power reactors with stoam r,enerators containing carbon steel support platos, to implement actions necessary to minimize the potential for a steam generator tutio rupture event caused by a rapidly propagating fatigue i

crack such as occurred at North Anna Unit 1.

The evaluation of this event l

for its applicability to the Trojan Nuclear Plant has been completed. The

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conclusion of this evaluation is that the steam generator tubes remaining in service at Trojrei are not expected to be susceptibio to fatigua rupture at the top support plate in a manner similar to the rupture that occurred a'. North Anna Unit 1.

Thereforo, no modifications, preventivo tubo plugging, or other mossures are necessary to provent a Noeth Anna-typo tube rupture at Trojan.

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8311170370 381101 FDR ADOCK 05000344 i

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f Mr. John B. Martin November 1, 1988 page 2 l

I Though the detailed evaluation is complete, the final report from our contractor has not been received. We expect to receive the report by mid-November, at which timo it will bo submitted for NRC review.

I Sincerely, t

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U.S. Nuclear Regulatory Commission i

ATTN: Document Control Desk Washington DC i

4 Mr. William T. Dixon I

State of Oregon

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Department of Energy i

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Mr. R. C. Barr

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NRC Resident Inspect.or j

Trojan Nuclear Plant i

Subscribed and sworn to before me this 1st day of November 1988.

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Notary Public of Oregon l

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My Commissior Expires

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