ML20153D494

Summary of 880810 Meeting W/Util,Westinghouse & BNL Re Status of Studies on Bmi Thimble Tube Wear Problems. Discussions & Licensee Handout Withheld

ML20153D494
Person / Time
Site:	South Texas
Issue date:	08/26/1988
From:	Milano P Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8809020225
Download: ML20153D494 (5)

Text

- _ _ _ _ _ _ _ - _ _ - _ _ _ _ _ .

August 26, 1958 Docket Nos. 50-498

and 50-499 LICENSEE

Houston Lighting & Power Company (HL&P)

FACILITY: South Texas Project, Units 1 and 2

SUBJECT:

STATUS OF STUDIES ON BMI THIMBLE TUBE WEAR The subject meeting was held on August 10, 1988. A list of attendees is included as the Enclosure.

Further information on the short and long term corrective actions for the BMI Thimble Tube wear problems was provided by Houston Light & Power Company (HL&P) and Westinghouse in a meeting with the staff on August 10, 1988. Westinghouse indicated that a gap between the flow limiter and the lower fuel assembly appears to be the primary mechanism that caused the higher flow and excitation of the thimble tubes. This was supported by the data results of lab flow tests. To correct this mechanism at STP, the flow limiters will be removed and a larger 0.0. thimble tube installed. This configuration has been shown not to experience excitation during testing. Additionally, magnetic ball check and manual isolation valves will be installed in each tube. The effectiveness of these actions will be monitored by a program of continued eddy current testing.

These modifications will be made to Unit 1 at the next refueling outage, except for the manual isolation valves which are to be instelled in September 1988.

Because of the installation sequence, Unit ? will make the modifications after fuel load but before initial reactor pressurization.

Much of the discussion was proprietary as was the licensee's handout.

Consequently, it is not included as an enclosure here. However, a copy is retained in the project manager's files.

Original signed by George F. Dick for.

Patrick D. Milano, Project Manager Project Directorate - IV Division of Reactor Projects - III, IV, Y and Special Projects

Enclosure:

As stated cc w/ enclosure:

See next page DISTRIBUTION IDicket: File ~r '

NRC PDR Local POR PD4 Reading J. Calso' ' G. Dick P. Milano OGC-Rockville E. Jordan B. Grimes ACRS(10) T. Martin (RegionIV) 4 Plant File a 4/PM gMilano:sr

/ C8/M/88 j U

{ll s

8809020225 DR 880826 I p ADOCK 0500o499 PDC

• o

. ' ' UNITED STATES E* o NUCLEAR REGULATORY COMMISSION

$ E WASHINGTON, D. C. 20655

'+,,,,,* August 26, 1988 '

Docket Nos. 50-498 and 50-499 LICENSEE: Houston Lighting & Power Company (HL&P)

FACILITY: South Texas Project. Units 1 and 2

SUBJECT:

STATUS OF STUDIES ON BMI THIMBLE TUBE WEAR The subject meeting was held on August 10, 1988. A list of attendees is included as the Enclosure.

Fuither information on the short and long term corrective actions for the Bt'l Thimble Tube wear problems was provided by Houston Light & Power Company (HL&P) and Westinghouse in a meeting with the staff on August 10, 1988. Westinghouse indicated that a gap between the flow limiter and the lower fuel assembly appears to be the primary mechanism thht caused the higher flow and excitation of the thimble tubes. This was supported by the data results of lab flow tests. To correct this mechanism at STP, the flow limiters will be removed and a larger 0.0. thimble tube installed. This configuration has been shown not to ,

experitnce excitation during testing. Additionally, magnetic ball check and manual -l solation valves will be installed in each tube. The effectiveness of these ac'*ons will be monitored by a program of continued eddy current testing.

These n.0/fications will be made to Unit I at the next refueling outage, except for the sta tual isolation valves which are to be installed in September 1988.

Because v# the installation sequence, Unit ? will make the modifications after fuel load S t oefore initial reactor pressurization.

Much of the discussion was proprietary as was the licensee's handout.

Consequently, it is not included as an enclosure here. However, a copy is retained in the project manager's files.

l J. U g Patrick D. Milano, Project Manager Project Directorate - IV Division of Reactor Projects - III, IV, Y and Special Projects

Enclosure:

As stated cc w/ enclosure:

See next page

Mr. J. H. Goldberg South Texas Project Houston Lighting and Power Company cc:

Brian Berwick, Esq. Resident Inspector / South Texas Assistant Attorney General Project Environmental Protection Division c/o U.S. Nuclear Regulatory Ct #Ission P. O. Box 12548 P. O. Box 910 Capitol Station Bay City, Texas 77414 Austin, Texas 78711 Mr. Jonathan Davis Mr. J. T. Westemeier Assistant City Attorney General Manager, South Texas Project City of Austin Houston Lighting and Power Company P. O. Box 1088 P. O. Box 289 Austin, Texas 78767 Houston, Texas 77483 Ms. Pat Coy Mr. R. J. Miner Citizens Concerned About Nuclear Chief Operating Officer Power City of Austin Electric Utili., 10 Singleton 721 Barton Springs Road Eureka Springs, Arkansas 72637 Austin, Texas 78704 Mr. M. A. McBurnett Mr. R. J. Costello Manager, Operations Support Licensing Mr. M. T. Hardt Houston Lighting and Power Company City Public Service Board P. O. Box 289 P. O. Box 1771 Wadsworth, Texas 77483 San Antonio, Texas 78296 Mr. A. Zaccaria Jack R. Newman, Esq. Mr. K. G. Hess Newman & Holtzinger, P. C. Bechtel Corporation 1615 L Street, NW P. O. Box 2160 Washington, D.C. 70036 Houston, Texas 77001 Melbert Schwart7, Jr. , Esq. Mr. R. P. Verret Baker 8 Botts Mr. R. L. Range One Shell Plaza Central Power and Light Company Houston, Texas 77002 P. O. Box 2121 Corpus Christi, Texas 78403 Mrs. Peggy Buchorn Executive Director Doub, Muritzing and Glasgow Citizens for Equitable Utilities, Inc. Attorneys at Law Route 1. Box 1684 Suite 400 Brazoria, Texas 77422 808 Seventeenth Street, N.W.

Washington, D.C. P0006 General Manager, Operations Support Houston Lighting and Power Company P. O. Box 289 Wadsworth, Texas 77483

x .

'. .  ?

Mr. J. H. Goldberg South Texas Project Houston Lighting & Power

,t Cc' Re tonal Administrator, Region IV U. . Nuclear Regulatory Commission Office of Executive Director for Operations 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011 Mr. Lanny Sinkin, Counsel for Intervenor Citizens Concerned about Nuclear Power, Inc.

Christic Institute 1324 North Capitol Street ,

Washington, D.C. P0007 -

Licensing Representative Houston Lighting and Power Corpany Suite G10 Three Metro Center Bethesda, Maryland 20814 Rufus S. Scott Associate "seneral Counsel Houston Lighting & Power Company P. O. Box 1700 Ho9ston, Texas 77001 INPO Records Center 1100 Circle 75 Parkway Atlanta, Georgia 30339-3064 Joseph M. Hendrie 50 Be11 port Lane i Be11 port New York 11713 l Gerald E. Vaughn, Vice President Nur. lear Operations Houston Lighting & Power Company P. O. Box 269 Wadsworth Texas 77403 R. W. Chewning, Chairman ,

Nuclear Safety Review Board Houston Lighting & Power Corpany P. O. Box 289 '

Wadsworth, Texas 77483 i, . , _ . . _ _ _ _- _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ . _ _ _ . . . _ _ _ _ _ _ _ . _ _ _ _ _ __.__ _--

Enclosure Attendance List NAME ORGANIZATION Mark McBurnett HL&P Stephen M. Dew HL8P Tam Stetku NRC Patrick Milano NRC 0e11 Hirst Westinghouse Bryan McLauchlin Central Power & Light Mary S. Wegner NRC Claudia M. Abbate NRC Daniel Merkovsky Westinghouse Shou-nien Hou NRC John Irons Westinghouse Ed Rusnica Vestinghouse Gene Glasbergen Westinghouse Mike Bunner HLt.P Oiuliano DeGrassi Brookhaven Nat. Lab.

Jack Ramsey MRC Jose A. Calvo NRC Dennis M. Crutchfield NRC

.