ML17326B169

Notifies of Intention to Replace Low Pressure Turbine Rotor W/Spare Rotor of Monoblock Design.Shipment of Rotor Expected in Feb 1986.Installation Anticipated in Late 1986 During Refueling Outage

ML17326B169
Person / Time
Site:	Cook
Issue date:	01/03/1985
From:	Alexich M INDIANA MICHIGAN POWER CO. (FORMERLY INDIANA & MICHIG
To:	Harold Denton Office of Nuclear Reactor Regulation
References
AEP:NRC:0912, AEP:NRC:912, NUDOCS 8501100181
Download: ML17326B169 (6)

Text

I REGULATOR INFORMATION DISTR I'BUTION

'TEM (R IDS)

SUBJECT:

Notifies of intention to replace low pressure turbine rotor w/spare rotor of "monoblock" design, Shipment of rotor expected in Feb 1986 ~ Installation anticipated in late 1986 u

0 d ring refueling utage

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DISTRIBUTION CODE; A001D COPIES RECEI,VED:LTR ENCL SIZE:

0, TITLE:

OR Submittal:

General Distribution ACCESSION NBR:8501100181 DOC ~ DATE: 85/01/03 NOTARIZED:

NO DOCKET FACIL:50-315 Donald C.

Cook Nuclear Power PlantF Unit l~ Indiana 8

05000315 AUTH BYNAME AUTHOR AFFILIATION ALEXICH<M,P, Indiana 5 Michigan Electric Co.

RECIP ~ NAME RECIPIENT AFFILIATION DENTONgH ~ RE Office of Nuclear Reactor Regulationg Director NOTES+

OL:10/25/74 05000315 RECIPIENT ID CODE/NAME NRR ORB1 BC 01-COPIES LTTR ENCL RECIPIENT ID CODE/NAME COPIES LTTR ENCL INTERNAL: ACRS ELD/HDS3 NRR/DL DIR TB REG FILE EXTERNAL: LPDR NSIC 09 04 03 05 ADM/LFMB NRR/DL/MTEB NRR/DL/ORAB NRR/DS I/RAB RGN3 NRC PDR 02 C7 TOTAL NUMBER OF COPIES REQUIRED:

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INDIANA 8 MICHIGAN ELECTRIC COMPANY P.O. BOX 16631 COLUMBUS, OHIO 43216 January 3,

1985 AEP:NRC:0912 Donald C. Cook Nuclear Plant Unit No.

1 Docket No. 50-315 License No. DPR-58 REPLACEMENT OF UNIT NO.

1 LOW PRESSURE TURBINE ROTOR Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Dear Mr. Denton:

This letter is to inform you that it is our intention to replace one of the low-pressure turbine rotors on Unit 1 with a spare rotor of a design, referred to as "monoblock".

The current low pressure turbine rotors are of a "built up" design consisting of individual rotor wheels shrunk on and keyed to a central shaft.

The new monoblock design is machined from a single piece forging eliminating the shrunk-on wheels, axial keyways and resultant high wheel bore stresses while maintaining the identical blade path and basic rotor geometry of the original design.

This allows "drop-in" interchangeability of the spare with any of the three existing low pressure rotors.

Utilization of a unit spare will also allow sequential inspection and repair or rebuild (if required) of the existing rotors between regular refueling outages while maintaining high unit availability and reliability.

Both the ourrent and the new design rotors are supplied by General Electric Company.

This monoblock rotor is scheduled for shipment from General Electric in February 1986 with anticipated installation during the refueling outage late in 1986.

In order to provide the necessary documentation for this changeover, it is our intent to prepare a report containing information similar to that in Chapter

14. 1. 13 of our Updated FSAR. If, at the time the report is

prepared, we feel the new monoblock design does not constitute an unreviewed safety question as defined in 10 CFR 50.59, then it is our intent to proceed with the changeover and update our FSAR in accordance with the provision of 10 CFR 50.71. If, as a result of the investigation, we find that we cannot perform a review under the provisions to 10 CFR 50.59 then the document will be submitted for your review at least six months prior to the planned changeover.

We assume the above intended schedule of activities is acceptable to your staff. Ifit is not, we would appreciate your response at the earliest possible date.

8501100181 850103 PDR ADOCK 05000315 p

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Mr. Harold R. Denton AEP: NRC: 0912 This document has been prepared following Corporate procedures which incorporate a reasonable set of controls to insure its accuracy and completeness prior to signature by the undersigned.

Very truly yours, Milton P. Alexich Vine President MPA/cm cc:

John E. Dolan W. G. Smith, Jr. - Bridgman R. C. Callen G. Bruchmann G. Charnoff NRC Resident Inspector - Bridgman

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