ML20246P611

Summary of 881130 Meeting W/Util at Plant Re Ability of Pressurizer Surge Line to Withstand Effects of Thermal Stratification.Discussions Concentrated in Areas of Design Documentation,Thermal Hydraulics & Stratification

ML20246P611
Person / Time
Site:	South Texas
Issue date:	09/05/1989
From:	Dick G Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8909110186
Download: ML20246P611 (6)

Text

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l '; j UN;TED STATES g *

' g- NUCLEAR REGULATORY COMMISSION O. 'j. tNASHINGTON, D. C. 20555 1 September 5, 1989

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Docket Nos. 50-498 and 50-499 LICENSEE: Houston Lighting & Power Company

-FACILITY: South Texas Project, Units 1 and 2-

SUMMARY

OF MEETING TO DISCUSS THE ABILITY OF THE PRESSURIZER SURGE LINE AT SOUTH TEXAS 1 (STP-1) AND 2 (STP-2) TO WITHSTAND THE EFFECTS OF THERMAL STRATIFICATION.

The subject meeting was held on November 30, 1988. The enclosure is the list of attendees.

BACKGROU,ND The licensee for the Trojan Plant has observed unexpected novement of the

. pressurizer surge line during inspections performad at each refueling outage since 1982, when monitoring of the line movemer,ts began. During the last refueling outage, the licensee found that in addition to unexpected gap closures in the pipe whip restraints, the piping actually contacted two restraints. The most'recent investigation by the licensee confirmed that the movement of piping was caused by themal stratification in the line. This phenotrenon was not considered in the origiral piping design. On October 7, 1988, the staff issued Information Notice 88-80, " Unexpected Piping Movement Attributed to Thermal Stratification," regarding the Trojan experience. Other licensees have also noticed larger than expected displacement of their pressurizer surge lines.

The staff developed a proposed course of action in late 1988 and was preparing to publish an NRC Bulletin (88-11) shortly before planned issuerce of the low power license.for STP-2. Further, the staff's position regarding resolution of the issue was that it had to be done before plant licensing.

MEETING

SUMMARY

At the November 30, 1988 meeting, the licensee and representatives from Westinghouse informed the staff of progress made in addressing the issue for South Texas. Since the units at South Texas are duplicates of each other, the discussion and results applied to both units.

The methodology and results to date in substantiating the design basis life of 40 years were presented. The discussions concentrated in the areas of design documentation, thermal hydraulics and stratification, monitoring programs, operations survey, heat transfer and stress analysis, stratification profiles, transient types, heatup-coodown transients, and design transients w/stratifice-tion. Because the discussions involved proprietary information, no information is included with this meeting sumtrary. However a copy of the handout is retained in the project manager's files. During the course of the meeting, the staff provided comments and ask questions for clarification of the presentation. At 8909110186 890905 ( /

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the end of the meeting, the licensee committed to submit the study on the docket. The submittal was made on December 9, 1988 and was the basis for the staff review for the low power license. The results of staff's review is reported in section 5.2.1 of the Safety Evaluation Report related to the operation of South Texas Project, Unit 2, (NUREG-0781), Supplement 6 (January 1989).

Auditional information on the subject of thermal stratification in the pressurizer surge line for South Texas may be found in the licensee's submittals of: January 17, 1989, February 1,1989, and February 15, 1989; NRC Bulletin No. 88-11 (December 20,1988); and Supplement 7 to NUREG-0781 (March 1989).

NC Geor h&

F. Dick, Jf. , Project Manager Project Directorate IV Division of Reactor Proje<ts - III, IV, Y and Special Projects Office of Nuclear Reactor Regulation

Enclosure:

As stated cc w/ enclosure:

See next page

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Enclosure 1 gdp:

1 Pressurizer Surge Line Meetini E

-c November 11, 1988 L U.S. ' Nuclear Regulatory . Houston Lighting & Power Company Jack Bailey.

'. P. George Dick-T. Kuo Wayne Harrison.

S. Hou~ S. B. Patel

- .CE Y.'Cheng-

, Claudia Abbate-Melinde Malloy Chu-yu 5.iang TU Electric T. J. Konyon Anthony Marvray S. Lee J. W. Muffett

P. Kadambi' Jack Redding Barry Elliot

. Westinghouse Duquesne Light Company

Dave Roarh Michael Testa

- George Antaki. Sanjb K. Mukherjee

-Bill Coslow=

Sam Palusamy:

Ed R.' Johnson

-Mark Barlow Ken: Chang-Brad Maurer-

. Gary - Ellis

. Warren Bamford

. Robert:W. Carlson R.. Michael'Roidt-Ron Coffield

-__:--________--__u__

161 - 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 Commission P. 0. Box 12548 P. O. Box 910

. Capitol Station Bay City, Texas 77414 Austin, Texas 78711 Ms. Iris J. Jones Mr. J. T. Westermeier. Acting City Attorney General Manager,' South Texas Project City of Austin Houston Lighting and Power Company P. O. Box 1088 P. 0. Box 289 Austin, Texas 78767 Houston, Texas 77483 Mr. S. L. Rosen Vice President, Nuclear Engineering Mr. R. J. Miner and Construction Chief Operating Officer Houston Lighting & Power Company City of Austin Electric Utility P. O. Box 289 721 Barton Springs Road Wadsworth, Texas 77483 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. E. T. Molnar Jack R. Newman, Esq. . Mr. L. W. Hurst Newman & Holtzinger, P. C. Bechtel Corporation 1615 L Street, NW P. O. Box 2166 Washington, D.C. 20036 Houston, Texas 77252-2166

-Melbert-Schwartz, Jr...Esq. Mr. R. P. Verret Baker & Botts Mr. R. L. Range One Shell Plaza Central Power and Light Company Houston, Texas 77002 P. O. Box 2121 Corpus Christi, Texas 78403 Doub, Muntzing and Glasgow Attorneys at Law Suite 400 808 Seventeenth Street, N.W.

Washington, D.C. 20006 l

t.4 Mr. J. H. Goldberg South Texas Project V Houston Lighting & Power Company cc:

Regional-Administrator, Region IV Bureau of Radiation Control U.S. Nuclear Regulatory Connission State of Texas Office of Executive Director 1101 West 49th Street

. for Operations Austin, Texas 78756 611 Pyan Plaza Drive, Suite 1000 Arlington, Texas 76011 Office of the Governor ATTN: Ms. Darla Parker Joseph M. Hendrie Office of Intergovernmental Relations 50 Bellport Lane Post Office Box 13561 Be11 port, New York 11713 Austin, Texas 78711 Judge, Matagorda County Gerald E. Vaughn, Vice President Natagorda' County Courthouse Nuclear Operations 1700 Seventh Street Houston Lighting & Power Company Bay City, Texas 77414 P. O. Box 289 Wadsworth, Texas 77483 Licensing Representative Houston Lighting and Power Company R. W. Chewning, Chairman Suite 610 Nuclear Safety Review Board Three Metro Center Houston Lighting & Power Company Bethesda, Maryland 20814 P. O. Box 289 Wadsworth, Texas 77483 Rufus S. Scott Associate General Counsel Houston Lighting & Power-Company P. O. Bcx 1700 Houston, Texas 77001 l

_______.____________m.___.__.m__ __

... - - September 5,1989

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the end of the meeting, the licensee connitted to submit the study on the docket. The submittal was made on December 9, 1988 and was the basis for the staff review for the low power license. The results of staff's review is.

reported in section 5.2.1 of the Safety Evaluation Report related to the operation of South Texas Project, Unit 2, (NUREG-0781), Supplement 6 (January 1989).

Additional information on the subject of thermal stratification in the pressurizer. surge line for South Texas may be found in the licensee's submittals of: January 17, 1989, February 1,1989, and February 15, 1989; NRC Bulletin No. 88-11 (December 20,1988); and Supplement 7 to NUREG-0781 (March 1989).

/s/

George F. Dick, Jr., Project Manager Project Directorate IV Division of Reactor Projects - III, IV, V and Special Projects Office of Nuclear Reactor Regulation

Enclosure:

As stated cc w/ enclosure:

See next page DISTRIBUTION

Docket F11ef

'NRC PDRT~~

Local .PDR J. Sniezek PD4 Reading F. Hebdon G. Dick OGC-Rockville E. Jordan B. Grimes NRC Participants ACRS (10)

T.. Martin (RegionIV) l , DOCUMENT NAME: MEETING

SUMMARY

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