ML20236B061

Forwards Request for Addl Info Re Util 870331 Submittal on Uprating Application

ML20236B061
Person / Time
Site:	Callaway
Issue date:	10/15/1987
From:	Alexion T Office of Nuclear Reactor Regulation
To:	Schnell D UNION ELECTRIC CO.
References
NUDOCS 8710230317
Download: ML20236B061 (3)

Text

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fOctober 15, 1987 Docket'No. 50-483. ,

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.Mr. Donal'd.F. Schnell-Vice President'- Nuclear Union Electric Company

. Post Office Box 149 St. Louis,' Missouri 63166 l 4

SUBJECT:

. REQUEST FOR ADDITIONAL INFORMATION REGARDING UPRATING APPLICATION i i

The staff is continuing its'. review of your March 31, 1987 and subsequent l submittals concerning:your uprating application. The staff requests.- j additional. information identified-in the Enclosure to continue its review.

This request for information affects. fewer than 10 respondents; therefore, OMB clearance is not required under Pub. L. 96-5117 t

Sincerely,

/s/ ,

Thomas W. Alexion, Project Manager Project Directorate III-3 ,

Division of Reactor Projects  !

Enclosure.

I As stated, cc: See next page i

Distribution:, ,

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iD6HeTlilef~PDRs NRC~& Local PDIII-3 r/f

'KEPerkins GHolahan  ;

PKreutzer TAlexion

! OGC-Bethesda EJordan JPartlow ACRS-(10)

' Grey File d, fs<r.o, EmrA Office: LA/PDIII-3 L PM PD/PDIFI-3 Surname: PK@tuer Tale DWigginton Date: 10fg/87 10/l /87 10/g/87 8710230317 871015 ..

PDR ADOCK 05000483 P PDR 3 L_ _ _ _

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'Mr.-D. F..Schnell- Callaway Plant

< Union' Electric. Company Unit'No. 1 m

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.. 'Dr. J. 0.'Cermack Mr. Bart D. Withers

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'CFA Inc. . .

President and Chief

-'4. Professional Dr., Suite 110' Executive Officer Gaithersburg, MD 20879 Wolf Creek Nuclear Operating-Corporation '

Gerald'Charnoff, Esq. '

P.-0. Box 411

? Thomas A..Baxter, Esq. . . . Burlington, Kansas : 66839.

'Shaw,:Pittman, Potts:& Trowbridge

.2300 N Street, N. W. Mr.LDan I. .Bolef, President Washington, D. C. 20037 Kay Drey,~ Representative Board of Directors Coalition EMr. TL P. Sharkey: for the Environment

~ Supervisor, Compliance .St. Louis Region Union Electric CompanyL 6267 Delmar Boulevard

-University City,-Missouri '63130' Post Office Box 620

Fulton,1MissouriiL65251-U..-S.-. Nuclear Regulatory C6mmission

' Resident Inspectors Office RR#1 Steedman,-Missouri' 65077 Mr. Alan.C..Passwater, Manager i Licensing and Fuels Union' Electric Company

Post Office Box 149 St. Loui's, Missouri 63166

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Manager ~ Electric Department Missouri Public. Service. Consnission. .

301 W.~High

' Post.0ffice Box 360- '

Jefferson. City, Missouri 65102 .{

l Regional Administrator I U.:5. NRC, Region III 799 Roosevelt Road jf Glen Ellyn,illlinois' 60137 q j

Mr. Ronald A. Kucera, Deputy Director

-Department of Natural Resources P. O. Box 176

-Jefferson City, Missouri 65102

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l RE00EST FOR ADDITIONAL INFORMATION POWER UPRATING CALLAWAY PLANT, l' NIT 1 DOCKET N0. 50-483 by letter dated September 18, 1987, the Union Electric Company responded to the staff's questions regardina the effect of power uprating on turbine missile protection. The licensee's response was insufficient to complete our review. Ve request the following adoitional information:

(1) Since the 1970's, cracks due-to stress corrosion have been discovereo on the' shrunk-on wheels and keyways of the low pressure turbines that are manufactured by General Electric and other vendors; therefore:

a) Provide a description and diagrams of the wheel and keyway geometry.

b) Frovide qualitative ana/or quantitative analysis demonstrating that uprating will not increase the chance of stress corrosion cracking.

(2) As part of above analysis (Question 1, part b), provide a detailed discussion of the effects of the following pararreters on the failure probability of turbine missile generation:

a) Discuss the effect of the change in the operating temperature of the turbine wheels.

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b) Discuss the effect of the changes in the steam entering the low pressure turbines; specifically, the quality, volume, oxygen concentration, mass flow rate, and speed of the steara.

(3) The licensee has stated that the turbine overspeed protection system will not be modified for uprating because the turbine speed will be the same as before. However, during abnormal events such as full load rejection, the turbine nay experience more steari than the original design capacity which may or may not cause the turbine speed to increase. The licensee's response in this matter is vague. Describe the operation and sequence of the turbine overspeed protection system during the following events: a) full load rejection and b) turbine runaway.

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