ML20030C767

Advises of Discontinuation of Ofc of Nuclear Reactor Regulation Monitoring of Util Insp of Low Pressure Discs. No Clear Indication of Stress Corrosion Cracking Discovered

ML20030C767
Person / Time
Site:	Fort Calhoun
Issue date:	08/19/1981
From:	Clark R Office of Nuclear Reactor Regulation
To:	William Jones OMAHA PUBLIC POWER DISTRICT
References
NUDOCS 8108280117
Download: ML20030C767 (2)

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D 6s - MS o/6-AUG 191981 DI ToinnTT N:

cket Fil JHeltemes NRC PDR Gray File Docket No 50-285 L PDR PMKreutzer-3 N

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Mr. W. C. Jones ORB #3 Rdg WRoss Division Manager, Production DEisenhut Operations OELD 3

AUG 25 SMp Omaha Public Power District I&E-3

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1623 Harney Street ACRS-10 Omaha, Nebraska 68102 9

Dear Mr. Jones:

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In our letter of May 1980 we recommended that you initiate a program to inspect the keyway and bore areas of your low Tressure discs for stress corrosion cracking. This action was prompted by the discovery of such cracks in Westinghouse turbines.

So far, the inspection program has covered one or more low pressure rotors at 15 nuclear plants using GE turbines. No clear indication of stress corrosion cracking has been discovered, although indications of water cutting and/or erosion have been observed in several turbines.

In view of these findings, we have decided to discontinue the NRR staff monitoring of these inspections. Normal activities of the Office of Inspection and Enforcement will continue of course.

We recommend that you continue to perfom disc inspections, as appropriate, and continue to work with General Electric Company to establish safe inspection schedules. Should you find any significant degradation, such as stress corrosion cracking, we would expect you to promptly report it in the normal manner.

Sincerely, originai mened by-tkL) /s). TownQw y Robert A. Cicek, Chief Operating Reactors Branch #3 Division of Licensing cc:

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