ST-HL-AE-2649, Responds to Generic Ltr 88-03, Resolution of Generic Safety Issue 93, 'Steam Binding of Auxiliary Feedwater Pumps.' Sys Contains Design Features to Reduce Potential Steam Binding.Topic Addressed in Response to Bulletin 85-001

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Responds to Generic Ltr 88-03, Resolution of Generic Safety Issue 93, 'Steam Binding of Auxiliary Feedwater Pumps.' Sys Contains Design Features to Reduce Potential Steam Binding.Topic Addressed in Response to Bulletin 85-001
ML20154R908
Person / Time
Site: South Texas  STP Nuclear Operating Company icon.png
Issue date: 05/31/1988
From: Goldberg J
HOUSTON LIGHTING & POWER CO.
To:
NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
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, ST-HL-AE-2649, NUDOCS 8806080256
Download: ML20154R908 (4)


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9[9tiesILigglst a:c>imalpatinty P.O. Box 1700 Ilouston, Texas 77001 (713) 228 9211 t

Ilouston Lighting &: Power - -- -- - - - -

May 31, 1988 ST-HL-AE-2649 File No.: G03.08 10CFR50.54(f)

U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 South Texas Project Electric Generating Station Units 1&2 Docket Nos. STN 50-498, STN 50-499 Response to Generic Letter 88-03 Resolution of Generic Safety Issue 93, "Steam Binding of Auxiliary Feedwater Pumps"

Reference:

Response to IEB 85-01, "Steam Binding of Auxiliary Feedwater Pumps," J. H. Goldberg, HL&P; Letter to Robert D. Martin, NRC; October 28, 1986, ST-HL-AE-1703.

Pursuant to 10CFR50.54(f), Houston Lighting & Power Company (HL&P) provides the following response to Generic Letter 88-03, "Resolution of Generic Safety Issue 93, ' Steam Binding of Auxiliary Feedwater Pumps'". The issue concerns the potential disabling of auxiliary feedwater (AFW) pumps by steam binding that is caused by backleakage past the isolation check valves downstream of the AFW pumps. HL&P has previously addressed this concern in response to IE Bulletin 85-01 (Reference 1).

The South Texas Project Electric Generating Station (STPEGS) AFW system contains design features that reduce the potential for s,eam binding to occur.

The STPEGS AFW system cor.aists of four independent traino that are normally not cross-connected. This eliminates the potential for steam binding affecting more than one trcin from a single event. In addition, two check valves and one normally clot.ed motor-operated stop check valve are located in each AFW line between the AEi pumps and the steam generators. Each AFW line is provided with a cross-connect to the Main Feedwater System. This pathway includes one check valve, a normally closed motor-operated stop check valve, and a normally closed flow control valve. When the cross-connect is in use (for low-load and filling operations), eac.h pathway includes one check valve and one normally closed motor-operated stop check valve.

NL.88.127.01 A Subsidiary of Ilouston Industries incorporated 8806080256 880531 PDR ADOCK 05000498 A DCD

llouston Lighting & Power Company ST-HL-AE-2649 File No.: G03.08 Page 2  ;

To further reduce the probability of AFW pump failure as a consequence of steam binding if backleakage occurs,.HL&P has implemented a method for monitoring AFW piping temperatures for indication of possible backleakage. A thermocouple, located in the AFW piping between the check valve nearest the AFW pump and the normally closed motor-operated stop check valve, provides temperature data to the Emergency Response Facilities Data Acquisition and Display System (ERFDADS). An alarm is included with a setpoint of 200 F. In the event the EnFDADS alarm indicates AFW 1 amp discharge header temperature greater than 200 F, operating procedures address local monitoring of the affected pump and associated piping, and purging the affected piping. l l

As requested by Generic Letter 88-03, this response confirms that l monitoring equipment to detect conditions favorable to the formation of auxiliary feedwater pump steam binding and procedures to restore the AFW system to operable status should steam binding occur are in place and will be maintained.

If you should have any questions on this matter, please contact Mr. M. A. McBurnett at (512) 972-8530.

d1 8 J. H. Goldberg Group Vice President, Nuclear JHG/PLW/ls NL.88.127.01

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ihnisum lJghtity; & Power Company i ST-HL-AE-2649 File No.: G30.08 Page 3 cc:

Regional Administrator, Region IV Rufus S. Scott Nuclear Regulatory Commission Associated General Counsel 611 Ryan Plaza Drive, Suite 1000 Houston Lighting & Power Company Arlington, TX 76011 P. O. Box 1700 Houston, TX 77001 George Dick INPO U. S. Nuclear Regulatory Comstssion Records Center Washington, DC 20555 1100 Circle 75 Parkway Atlanta, Ga. 30339-3064 Dan R. Carpenter Senior Resident Inspector / Operations Dr. Joseph M. Hendrie c/o U. S. Nuclear Regulatory Commission 50 Be11 port Lane P. O. Box 910 Bellport, NY 11713 Bay City, TX 77414 Don L. Garrison Resident Inspector / Construction c/o U. S. Nuclear Regulatory Commission P. O. Box 910 Bay City, TX 77414 J. R. Newman, Esquire Newman & Holtzinger, P.C.

1615 L Street, N.W.

Washington, DC 20036 R. L. Range /R. P. Verret Central Power & Light Company P. O. Box 2121 Corpus Christi, TX 78403 R. John Miner (2 copies)

Chief Operating Officer City of Austin Electric Utility 721 Barton Springs Road Austin, TX 78704 R. J. Costello/M. T. Hardt City Public Service Board P. O. Box 1771 San Antonio, TX 78296 Revised 05/18/88 NL.DIST

UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter )

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Houston Lighting & Power ) Docket Nos. 50-498 Company, et al., ) 50-499

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South Texas Project )

Units 1 and 2 )

AFFIDAVIT J. H. Goldberg being duly sworn, hereby deposes and says that he'is Group Vice President, Nuclear of Houston Lighting & Power Company; that he is duly authorized to sign and file with the Nuclear Regulatory Commission the attached response to NRC Generic Letter 88-03; is familiar with the content thereof; and that the matters set forth therein are true and correct to the-best of his knowledge and belief.

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J. H. Goldberg Group Vice Presid t, Nuclear Subscribed and sworn to before me, a Notary Public in and for The .

State of Texas this 8/s* day of /7)a.y , 1988. .{

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Notary' Publid' in and for the State of Texas ll '.., </ W, com=m boaes 7 v 91 N ~_  : _ _z~ _ _ _ _

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