ML20076H399

Discusses Resolution of GSI 93, Steam Binding of Auxiliary Feedwater Pumps. Commitment Exceeded Recommendations of Bulletin 85-001 & GL 88-03

ML20076H399
Person / Time
Site:	Callaway
Issue date:	10/11/1994
From:	Schnell D UNION ELECTRIC CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
REF-GTECI-093, REF-GTECI-NI, TASK-093, TASK-93, TASK-OR GL-88-03, GL-88-3, IEB-85-001, IEB-85-1, TAC-M67223, ULNRC-3085, NUDOCS 9410210185
Download: ML20076H399 (3)

Text

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314 'M M50 Donald F Schnell UnrON Etscruic Octoher 11, 1994  ?*~* * "'

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U.S. Nuclear Regulatory Commission ATTN.: Document Control Desk Mail Station P1-137 Washington, D.C. 20555 Gentlemen: ULNRC-3085 TAC NO. 67223 CALLAWAY PLANT DOCKET NUMBER 50-483 RESOLUTION OF GENERIC SAFETY ISSUE 93,

" STEAM _ BINDING OF AUXILIARY PEEDWATER PUMPS" Ref erences : 1) NRC Bulletin No. 85-01 dated October 29, 1985

2) NRC Generic Letter 88-03 dated February 17, 1988

3) NRC letter from T. W. Alexion to D. F. Schnell dated July 8, 1988

4) NRC Inepection Report No. 05-483/90013 (DRP) dated August 28, 1990 Generic Letter 88-03 was issued to alert licensees of the potential for steam binding in the auxiliary feedwater system. Union Electric responded to l this issue by letter dated May 12, 1988 (ULNRC-1774).  :

This letter stated that a combination of training,  !

administrative controls, and design features would be utilized to minimize the possibility of steam binding the auxiliary feedwater (.AFW) pumps. In addition, Union Electric elected to vent the AFW pumps each shift'to ensure that no system back-leakage had occurred. This commitment exceeded the recommendations of Bulletin 85-01 and Generic Letter 88-03.

I Venting the pumps each shift has resulted in 1 rust stains and general housekeeping concerns in the area l of the pumps. A review of the AFW system piping i arrangement shows that touching the pipe in the area of the pump discharge check valve (as recommended by Bulletin 85-01 and as required by Callaway procedures) provides adequate indication of the fluid conditions.

Therefore, Union Electric will no longer vent the AFW l pumps each shift.

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USNRC --3085 Page 2 Please contact us if you have any questions or I comments concerning this commitment change.

Very truly yours,  ;

Pit Donald F. Schnell I

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i cc: T. A. Baxter, Esq. l Shaw, Pittman, Potts & Trowbridge 2300 N. Street, N.W.

Washington, D.C. 20037 M. H. Fletcher Professional Nuclear Consulting, Inc.

18225-A Flower Hill Way Gaithersburg, MD 20879-5334 L. Robert Greger Chief, Reactor Project Branch 1 U.S. Nuclear Regulatory Commission Region III 801 Warrenville Road Lisle, IL 60532-4351 Bruce Bartlett Callaway Resident Office U.S. Regulatory Commission RR#1 Steedman, MO 65077 L. R. Wharton (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

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