ML20003D562

Forwards Summary of Findings Re Ultrasonic Insps of LP-2, LP-B & LP-C Rotors.Physical Properties for Wheels W/Indications Will Be Submitted to NRC by Ge,Per Existing Proprietary Agreement

ML20003D562
Person / Time
Site:	Quad Cities
Issue date:	03/20/1981
From:	Janecek R COMMONWEALTH EDISON CO.
To:	Ippolito T Office of Nuclear Reactor Regulation
References
NUDOCS 8103270663
Download: ML20003D562 (3)

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,s Commonwealth Edison O One First National Plaza. Chicago. Illinoi Address Reply to: Post Office Box 767 Chicago, Illinois 60690 March 20, 1981

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g k, g Mr. T. A. Ippolito, Chief dP .

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Operating Reactors - Branch 2 g 7 Division of Operating Reactors 4f U.S. Nuclear Regulatory Commission -

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Washington, DC 20555 V-

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Subject:

Quao Cities Station, Unit 1

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LP Turbine Wheel Inspection g,/ g 3-#.~ ,i Report 3 ' O' NRC Docket No. 50-254

Dear Mr. Ippolito:

Attached is a summary of the findings of the ultrasonic inspections of Quad Cities Station, Unit 1, LPA, LPB, and LPC rotors. These results were previously reported to the NRC Staff verbally on the dates listed below:

LP-A October 2, 1980 LP-B November 8, 1980 LP-C November 25, 1980 The attached Table 1 gives a complete description of the indications found. The physical properties for those wheels with indications will be submitted directly by General Electric in accoroance with their existing proprietary agreement with the NRC.

l We have performed calculations to determine the reinspection interval for the Unit 1 L.P. turbines. We used the NRC acceptance criteria which states that a disc which contains inoications must be reinspected in one half the time calculated to reach one half the critical crack size. Using General Electric's most recent Acr and the NRC's Upper Bound Crack Grnwth Rates Curve initialed by Warren Hazelton on June 16, 1980, we calculated the minimum reinspection interval to be 86 months, based on the worst, or limiting, wheel.

If you have any questions please contact this office.

Very truly yours, Robert F. Janecek Nuclear Licensing Administrator Boiling Water Reactors 'cc/

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RIII Inspector - Quad Cities j

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8103270663 16268

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TABLE'1 -

UPSTR. HEC MAXIMUM HUB,m XEYWAY ULTRA 50tlIC INDICATION

SUMMARY

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MEASURED p-IN0ftATInti y .

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-QtlAD CITIES STATION, UNIT 1 '

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' - DEPTH E(Ai)]'

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LPA, LPB, and LPC ROTORS

. IllSPECTIO!1 DATE: 9/80 - 11/80 -

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LEADINh; EDGE -

. OF KEYUAY ,

. Hub Test (ItT) Heb Test (WT) -

s H W _ocation 4 Location -

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Zone (A-E) (Ik) .

Coments IV (In) (In) Zone (A-E) ( Ln) 5-TA 2.23 5.5 A .53 -- --- Indication appears deepest near web.

6-TA 2.73 6.5 A- .07 --- ---

D 4 07 ,

6-GA 2.73 6.5 E .10 --- --- .

4-TB 2. ? ") 4.0 -- , --- DE (. 03 Several indications detected under web.

5-TB 2.23 5.5 A .52 A,B .12 .

E .?1 --- --- .

5-GB 2.23 5.5 A .32 A,B 4.030 Indication under hub appears deepest near web.

• D,E .23 --- --- Several indications detected under hub.

4-TC 2.73 4.0 --- --- C .12

• 5-TC 2.23 5.5 B,C .07 --- --- Indication appears deepest near web.

E .23 D. .24 Indication under hub appears deepest near' web.

5-GC 2.23 5.5 A- .14 --- --- Indication appears deepest near web'.

C- .14 B,C .12 Indication under hub appears deepest near web.

6-GC 2.7,3 6.5 A .12 .--- --- Indication appears deepest near web. _

SEE ElPLANATIO10F TABLE 1- NEXT l' AGE ,

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.. :. EXPLANATION OF TABLE l_

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. . KEYWAY ULTRASONIC Ih01CAliON SUM'ARY Table 1 (Keysay Ultrasonic Indicatica Sumary) contains the measured depths and locations of ultrasonic indications detected on the keysays.

The table includes the following ,

of the subfec : shrunk-cn wheels.

information foi each wheel with keysay ultrasonic indicaticas.

H: Axial length of the upstream hub 7: Axial length of the web, at the hub diameter.

Locatien Zone (A-E)_: .The approximate circumferential 1ccatica of the indication relative to the leading edge of the keysay (as viewed with normal rotorrotation).

(. Ai:-Tne caximum indicacien depth as measured with a radially directed ultrasonic beam. ~

Coments_: Additional cements have been included as available.

In cases where indicaticns detected by the hub and web tests appear ble.

, 'to possibly be associated, they have been listed on the same line or, the ta

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