ML20248G087

Responds to NRC Bulletin 88-011 Re Pressurizer Surge Line Thermal Stratification.Action Items 1.a & B Completed & 1.d Actions Re Stress & Fatigue Ongoing Through Westinghouse Owners Group

ML20248G087
Person / Time
Site:	Callaway
Issue date:	09/28/1989
From:	Schnell D UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
IEB-88-011, IEB-88-11, ULNRC-2084, NUDOCS 8910100054
Download: ML20248G087 (5)

Text

, - - ._. - - --_ __

1901 Gratsat $treet

. Post Office B:n 149

~*

St Iout thssouriE3166

' 314 554 2650 l

Donald. MneH Etscrme [1\70N seetember 28, 1989 5 W Preent M U.S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Station PI-137 Washington, D.C. 20555 ULNRC- 2084 Gentlemen:

DOCKET NUMBER 50-483 CALLAWAY PLANT PRESSURIZER SURGE LINE THERMAL STRATIFICATION

Reference:

NRC Bulletin 88-11, dated December 20, 1988 NRC Bulletin 88-11 requested licensees to establish and implement a program to confirm pressurizer surge line integrity with regards to thermal stratification.

This is to be accomplished by:

a) performing a visual inspection, b) performing a generic bounding analysis to demonstrate that the pressurizer surge line meets the applicable design codes, c) obtaining monitoring data, as necessary, and; d) updating the stress and fatigue analysis to account for stratification and striping.

In accordance with Action Item 1.a, a visual inspection of the surge line was performed during the Callaway Refuel III outage (e.g., 3/31/89 to 5/22/89).

The piping, pipe supports, and whip restraints were inspected and showed no signs of damage from surge line movement.

Action Item 1.b required a generic bounding analysis be performed within 1 year of receipt of the bulletin to demonstrate that the pressurizer surge line would meet the applicable design codes. This requirement has been satisfied for Callaway Plant through the Westinghouse Owners Group (WOG) as demonstrated in WCAP-12277. WCAP-12277 provides the approach and basis for the bounding evaluation for all domestic Westinghouse plants and has been reviewed and accepted by NRC. The bounding analysis draws on 8910100054 890928 -f'dh PDR ADOCK 050004B3 PNU / F '\ p G \

i.

s:

information obtained from four detailed stress analyses l and twelve interim evaluations that include finite element structural analyses. The WCAP is based in part on the Callaway Plant and is therefore directly applicable to Callaway.

Action Item 1.c suggested the use of data collection to detect temperature distribution and thermal movements. The WOG program has obtained data through collective efforts and has developed temperature l profiles and thermal transients based on the data. This information was considered'in the development of WCAP-12277 and will be used in the detailed stress and fatigue analysis. No further actions are required for this action item.

Action item 1.d required a detailed quantitative analysis be performed which would include updates to the stress and fatigue evaluations of the surge line to include the effects of stratification. A WOG program has been initiated to develop the methodology for the analysis, to which the Callaway plant-specific variables (e.g., seismic and thermal loadings) will be applied.

This analysis will form the basis for the updated stress reports. This action will be completed by December, 1990.

In conclusion, NRC Bulletin 88-11, Action Items 1.a and 1.b have been completed and activities associated with Action Item 1.d, the detailed stress and fatigue analysis, are ongoing through the WOG and are expected to be completed by December, 1990. Documentation associated with this program is being. maintained at Callaway Plant and is available for review by the NRC staff.

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

Very truly yours, J

, ff' Donald F. Schnell WEK/ dis

~

3 :s ' ,

STATE OF . MISSOURI - )

) - S S-G, CITY OF'ST. LOUIS )

. Donald F. Schnell, of lawful' age, being'first duly sworn upon oath says,that,he is Senior Vice President-Nuclear and,an officer of: Union' Elisctric Company; that he has read the foregoing document and knows the, content thereof; that:he has:cxecuted the same for and on behalf of pa!.S company with full power and authority to do.

so;;and that the fact's taerein stated are true and' correct to the best of his knowledge, information and. belief.

By .

w ~!Tonald F. S6hnell.

Senior Vice President Nuclear SUBSCRIBED and sworn to before me this 'M[ day of. $ //4 1989 1

0l MRDARA . PTA N01ARY PUD 1!C, STATE Of MISSOURI MY COMM:S$10N EXPlRES APRIL 22, 1914 ST. LOUIS COUNTY l

l l

l t

l L

l l

\

l

.?

L L.

i

!' cc: Gerald Charnoff, Esq.

Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N.W.

Washington, D.C. 20037 Dr. J. O. Cermak CFA, Inc.

4 Professional Drive (Suite 110)

Gaithersburg, MD~ 20879' R..C. Knop Chief, Reactor Project Branch 1 U.S.. Nuclear Regulatory Commission Region.III 799 Roosevelt Road Glen Ellyn,' Illinois 60137 Bruce Little Callaway Resident Office U.S. Nuclear Regulatory Commission

-RRil Steedman, Missouri ~65077

{

Tom Alexion (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 I

l 1.

l L

L

s  :.. <

lx:c: D. Shafer/A160.761

/0A. Record: (CA-758)

Nuclear Date E210.01-DFS/ Chrono D. F. Schnell J. E. Birk J V. Laux M. A. Stiller G. L. Randolph R. J. Irwin H. Wuertenbaecher

17. R. Campbell A. C. Passwater R. P. Wendling D. E. Shafer D. J. Walker O. Maynard (WCNOC)

N. P. Goel (Bechtel)

T. P. Sharkey NSRB (Sandra Auston)

/1 ns. oto + (tv-id cA60s H8 tu. s. 44 A.4. L ay.

4 1

i i

_____________--_D