ML20065R777

Requests Extension to Allow for Completion of Updated Stress/Fatigue Analysis Until Mar 1990,in Response to NRC Bulletin 88-011.Plant Used 2 of 10 Addl Heatup & Cooldown Cycles as Discussed in Author

ML20065R777
Person / Time
Site:	Callaway
Issue date:	12/11/1990
From:	Schnell D UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-88-011, IEB-88-11, ULNRC-2338, NUDOCS 9012190171
Download: ML20065R777 (4)

Text

_ _ _ _ _ _ _ _ _ _ _

e

• f* 1901 Ocukuu hvnue Pcx! D"ce Fox ?O St Lars Muum Gibe s 314 Eb4 2650 y s Donald f. Schnell Eucenuc CC"""

33 December 11, 1990 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station Pl-137 Washington, D.C. 20555 Gentlemen: ULNRC- 2 3 38 CALLAWAY PLANT DOCKET NUMBER 50-483 PRESSURIZER SURGE LINE THERMAL STRATIFICATION

References:

1) NRC Bulletin 88-11, dated December 20, 1988

2) ULNRC-1936, dated March 10, 1989

3) T.W. Alexion letter to D. F. Schnell dated May 19, 1989

4) ULNRC-2084, dated September 28, 1989

5) WCAP-12277 dated June 1989

6) A. T. Gody, Jr. letter to D. F. Schnell, dated September 17, 1990 Reference 1, Action Item 1.d, requires Union Electric to update the ASME Class 1 stress and fatigue reports by incorporating loads resulting from thermal stratification in the pressurizer surgo 1.nc. This action is required to be complete no later than two years after receipt of the Bulletin.

Union Electric, in Reference 4, committed to having this action item completed by December, 1990.

UE requests an extension of the December, 1990 dato until March 31, 1991. An extension is required to allow for completion of the updated stress / fatigue analysis. A Westinghouse Owners Group (WOG) program to develop the methodology for updating the stress and fatigue reports has been completed. This program, contained in WCAP-12639, shows that Callaway (Group 15, Plant 46) has acceptable stresses and cumulative usage factor limits. Westinghouse and Union Electric are currently performing the plant specific f applicability study as described in WCAP-12639. /

9012190171 901211 /,b<3 PDR ADOCK 05000483 k

=0 PDR

. In addition, Callaway has only used 2 of the 10 additional Heatup and Cooldown cycles as discussed and allowed by NRC-in References 5 and 6.

Thorofore, there are no short-term safety concerns associated with the thermal stratification effects during the additional three months of plant operations needed to complete the applicability study.

If you have any questions concerning this letter, please contact me.

Vor truly yours, 14 0 ->

onald F. Schnell WEK/kea l

l

- =, , .- _ .

f STATE OF MISSOURI )

) SS CITY OF ST. LOUIS )

Donald F. Schnell, of lawful age, being first duly sworn upon oath says that he is Senior Vice Presjdent-Nuclear and an officer of Union Electric Company; that he has read the foregoing document and knows the content thereof; that he has executed the same for and on behalf of said company with full power and authority to do so; and that the facts therein stated are true and--correct to the best.of his knowledge, information and belief.

By__

Donald F. Schnell Senior Vice President

-Nuclear SUBSCRIBED and sworn to before me this //dA day of D44/sm A/AJ , 1990.

Abd4As 7

hA/4 B ARDARA J. PF AFF

/ Vl l_

E NOTARY IUDUC, STATE OF MtS50VRI My COMMissl0N EXPIRES APRIL 22, 1993 l ST. LOUIS COUNTY l'

\

l

,e,-.. y ww- ,- w ~ g

.. . c.

. , a

• cci T .~ A . Baxter, Esq.

Shaw, Pi t tman, Potts & Trowbridge i 2300 N. Street, N.W. l Washington, D.C. 20037 j Dr. J. O. Cermak CFA, Inc. I 4 Professional Drive (Suite 110)  ;

Gaithersburg, MD 20879 1 R. C. Knop Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory Commission Region III  ;

799 Roosevelt Road Glen Ellyn, Illinois 60137 Bruce Bartlett Callaway Resident Office U.S. Nuclear Regulatory Commission RRM1 Steedman, Mirsouri 65077 Anthony T. Gody, Jr. (2)

Office of Nuclear' Reactor Regulation U.S. Nuclear Regulatory Commission 1 White Flint, North, Mail Stop 13E21 11555 Rockville Pike Rockville, MD 20852 Manager, Electric Department Missouri Public Service commission P.O. Box 360 Jefferson City, MO 65102 l

t