ML20029A281

Discusses Results of Core Operating Limits Rept.Util Exceeded Limits by .5%.Encl Revising W(Z) Functions Per Tech Spec 6.9.1.9 Incorporated Into Facility Core Operating Limits Rept,Cycle 5

ML20029A281
Person / Time
Site:	Callaway
Issue date:	01/31/1991
From:	Schnell D UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-M-79511, TAC-M79511, ULNRC-2360, NUDOCS 9102070159
Download: ML20029A281 (6)

Text

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I901 Chouteau Avenue; l

- PostOttteBox 149.

St Iours. Missouri 63166

314-554 2650 ;

l Eu?c"n'O'-

DonaldF. Schncil i

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January - 31, 1991 U.-S. Nuclear Regulatory Commission ATTN:

Document ControlLDesk

' Mail Station-P1-137 Washington, D.

C.

20555 ULNRC-2360

.Gentlemon t

DOCKET-NUMBER 50-483, TAC-M79511 CALLAWAY PLANT - CYCLE 5 CORE OPERATING LIMITS REPORT

Reference:

ULNRC-2323 dated. November 14, 1990

'As al result-of incore flux measurements taken on January 18, 1991,'it wasLdetermined that Callaway had m

exceeded its F limit bylapproximately 0.5%..

In g

accordance with' Technical Specification Action-Statement 3.2.2.a, power was reduced to compensate.for the exceeded limit.- Discussions-were held with Westinghouse Electric

--Corporation to assess this issue and' determine.~if any--

4 analytical = margin' existed in the Fg limit. calculation.-

' Westinghouse' indicated that the W(Z) portionlof-the F n

~

g calculation was-based on the'most conservative radial

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' xenon' penalty?for the cycle,.which occurs at end ofElife-I I

( EOL').

Margin was,'vailable at'beginning ofLlife (BOL) a

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b

and middle of life (MOL).

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.-Per'the. requirements of Technical Specification

'6.9.1.9,-notificationiis hereby-provided that the attached Westinghouse letter 91SCP-G-0004, dated January-18 1991, containing a= description of the revised W(Z) functioni has boon-incorporated into the Core Operating Limits Report for-Callaway Cycle 5.

The Core Operating Limits Report

'9102070159-910131 O!

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l PDR '-ADOCK.050004B3

.P PDR f

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I was previously. transmitted by the referenced. letter.

The I

analytical methods used to determine-the revised function j

are-those referenced in Technical specification 6.9.1.9.

I Updated figures containing the-revised W(Z) functions will submitted in the near future.

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Very truly yours, k"l sL i

et Donald F. Schnell RJI/DS/sla Attachment

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t T.- L A. ~ Baxter, TEsq' -.

t c c i-1 i Shaw,' Pittman;'Potts & Trowbridge.

J2300.N. Street,;N.W.

Washington, D.C.-;20037-tir.= J.

O.- Cermak'

-f CFA, Inc.

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' 4 Profeesional. Drive 1(Suite 110)

Gaithersburg,LMD 20879

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- Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory Commission Region.III-

- 799 Roosevelt Road

' Olen Ellyn',fIllinois 60137 1 Bruce' Bartlett Callaway Resident-Office U.S. Nuclear. Regulatory Commission

- RR#1; 4

Steedman,.Missourd'65077 M' v D. I,ynch-(2)

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Officefof: Nuclear Reactor Regulation j

U.S.-Nucle.ar' Regulatory Commission 1 White' Flint, North,l Mail Stop 13E21 115S5 Rockville-Pike' Rockv111e', MD '20852

- Manager, Electric Department-Missouri Public Service Commission 9-

- P.O.--Box 360 Jefferson City,eMO 65102 n

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TO 314 534 4176 JAN se, 1991 e 43o o,n FROMtW NUC FD 4

833012 Westinghouse Commerclal Nucleat

""#0 "'""'"' 42 3* 2 Electric Corporation Fuel Olvision January 18,-1991 91SM0004

'Mr. Randall J. Irwin (490)

Supervising Engineer, Nuclear Fuel-Union Electric Cenpany P.O. Box 149 St. 7mais, Missouri 63166 Dear Mr. Irwin UNION EIICTRIC 029ANY CALIAh%Y PIANI' R WISED WfZ) PLHCTIONS FOR CATT Ah%Y C'1CIE 5 Enclosed for your use is a description of a ruvision to the W(z) function in the Core operating Limits Report for callaway Cycle 5.

Sincerely, a

y. Slater Project Epinear Mktg. & customer Projects JIS:mid -

Enclosure REVIEWED

,7 z / A ) W M

///d/9i AND APPROVED a dsf/ M f g g7 PER FDP 22 010

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to:

314 534 4176 JAN 18, 1991 6143PM A.23 FO W E FD RrvisrD WI2) PtNcTrCNS FOR CMTAWAY CYMR 5 2e W(z) functions for Callaway Cycla 5 have been zwvised das to M

violations when they are applied to the measured M as a function of height. Se W(z) functions were evaluated and margin has been da*eh at BOL and ICL. By usire a radial xenon penalty %51 ate to the tina in life, the BOL W(z) may be rwhM by 1% and }cL ty 1/2%.

Ravised W(z) functions will follow.

Please rete that the revised functions will be slightly different (in the third decimal place) than the values derived with the above rutactions.

4 4

N. A. Pogorz

.i Core Desi E

ly/)l Date:

I H. Q.- Iam Ccre Depi E

Reviewed:

E. F. Pulver Datertll M

Core Design E Date:

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gar Core Design E Date:

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