ULNRC-03855, Provides Addl Info in Support of License Amend Request Re Rev to MSSV Setpoint Tolerance Value Contained in TS Table 3.7-2,as Discussed W/Nrc on 980625.Preliminary Results Indicate This Addl Tolerance Can Be Accommodated

Provides Addl Info in Support of License Amend Request Re Rev to MSSV Setpoint Tolerance Value Contained in TS Table 3.7-2,as Discussed W/Nrc on 980625.Preliminary Results Indicate This Addl Tolerance Can Be Accommodated

ML20236H814
Person / Time
Site:	Callaway
Issue date:	06/29/1998
From:	Passwater A UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-M99419, ULNRC-03855, ULNRC-3855, NUDOCS 9807070367
Download: ML20236H814 (4)

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Union riectric Une Amerein Ylar.a 1901 Chouteau Avenue YO Box 66149 St. louis, M0 63166-6149

, 31W1.32D June 29,1998 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Mail Station Pl-137 Washington, DC 20555-0001 ULNRC-03855 Gentlemen: TAC No. M99419

[6 CALLAWAY PLANT 97f UNION ELECTRIC COMPANY DOCKET NUMBER 50-483 UE REv>Sion To TecunicAL SeEciercATion

References:

1) ULNRC-03627 dated 8/8/97

2) ULNRC-03696 dated 12/16/97

3) ULNRC-03717 dated 1/20/98

4) ULNRC-03747 dated 3/4/98

5) ULNRC-03771 dated 3/17/98 References I through 5 transmitted information to support a change to the MSSV setpoint tolerance value contained in Callaway Technical Specification Table 3.7-2. Based on discussions with the NRC Stafron June 25,1998, we are =

providing additional information in support of this amendment request.

An evaluation of LOCA pad non-LOCA transients was performed with a 0.5% tolerance for test equipment uncertainty. The 0.5% tolerance bounds the test equipment vendor's published equipment accuracy of 0.27%. This evaluation determined that there was no increase in the primary peak pressure and that the secondary side peak pressure increase due to the 0.5% tolerance is less than 6 psi lf and would remain below 1318.5 psia,110% of secondary side design pressure.

((,df We have evaluated the current dose calculations with respect to steamline break, locked rotor, loss of external electrical load, loss of nonemergency ac power, and rod ejection. For these accidents / transients there are no increases in the assumed mass and energy releases and therefore no impact on the reported doses.

MSSV tolerance assumptions affect other system design calculations.

Revision of these affected calculations, incorporating the additional 0.5%

tolerances, will be completed by July 30,1998. Preliminary results indicate this additional tolerance can be accommodated. We will notify the staff when this work is complete.

9807070367 980629 PDR ADOCK 05000483 p PDR e subsodtary of Amoren Corporation

ULh1C-03855 June 29,1998 Page 2 If you have any questions concerning this letter, please contact us.

Sincerely, M ,d,b ,#- -

Alan C. Passwater p Manager, Licensing and Fuels WEK/pir Attachments:

1) Response to Request for Additional Information

2) Revised Technical Specification Changes i

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STATE OF MISSOURI )

) SS CITY OF ST. LOUIS )

David Shafer, of lawful age, being first duly sworn upon oath says that he is Supervising Engineer,

, Licensing and Fuels, Regulatory Operations (Nuclear) for l 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.

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( l By ihA" k YY^ ~ '

David Shafer Supervising Engineer, Licensing and Fuels, Regulatory Operations-Nuclear l'

SUBSCR ED and sworn to before me this #7 day of , 1998.

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/t.Ag . m i

PATIW0l4LlWYNOLDS ageurneus eunteressaout St.LOMs 00MImf Mr M G M OE.3, Msg

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cc:

-M. H. Fletcher Professional Nuclear Consulting, Inc.

19041 Raines Drive Derwood, MD 20855-2432 l Regional Administrator l U.S. Nuclear Regulatory Commission Region IV 611 Ryan Plaza Drive Suite 400 Arlington, TX 76011-8064 l

. Senior Resident Inspector Callaway Resident Office U.S. Nuclear Regulatory Commission 8201 NRC Road Steedman, MO 65077 l

Kristine M. Thomas (2)

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 1 White Flint, North, Mail Stop 13E16 l ~

11555 Rockville Pike Rockville, MD 20852-2738 l Manager, Electric Department Missouri Public Service Commission P.O. Box 360 Jefferson City, MO 65102 l-l

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