ML20151G147

Advises That Staff Concludes That as-built Reconciliation (Abr) of 100% Class 2 & 3 Piping May Be Relaxed.Requests to Provide Statistical Evaluation of Results After Abr Program Completion

ML20151G147
Person / Time
Site:	South Texas
Issue date:	07/18/1988
From:	Dick G Office of Nuclear Reactor Regulation
To:	Goldberg J HOUSTON LIGHTING & POWER CO.
References
TAC-67871, NUDOCS 8807280159
Download: ML20151G147 (5)

Text

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'o UNITED STATES g

! o NUCLEAR REGULATORY COMMISSION 5 aE WASHINGTON, D. C. 20555

\ . . . . . ,o# July 18,1988 Decket No. 50-499 Mr. J. H. Goldberg Group Vice-President, Nuclear Houston Lighting & Power Company P. O. Box 1700 Houston, Texas 77001

Dear Mr. Goldberg:

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SUBJECT:

AS-BUILT RECONCILIATION PROGRAM, SOUTH TEXAS PROJECT, UNIT 2 (TAC NO. 67871)

In IE Bulletin No. 79-14, Revision 1 (July 18, 1979), the staff stated that l

---where design specifications and drawings are used to obtain input information l for seismic analysis of safety-related piping systems, that it is essential for those documents to reflect as-built configurations." As a result of the staff's concerns the belletin directed that all licensees and applicants verify l that the plant's seismic analysis applied to the actual configuration of safety- l related piping systems. '

In letters from Houston Lighting & Power (HL&P) dated January 5 and A l 1988, the plan for addrassing the South Texas Project Unit 2 (STP-2)pril IE 18, Bulletin 79-14 requirements for conducting an as-built reconciliation (ABR) program was presented. The HL&P position was that the Unit 2 program would be limited to Class 1 piping only unless the program identified significant problems; then an evaluation will be performed and corrective action taken.

The staff, in evaluating HL&P's proposal, considered the results of the Unit 1 ABR which resulted in inodifications to only three supports and the fact the same design and control program that was applied to Unit I was also implemented on Unit 2. In addition, the staff performed a limited audit during the week of l June 20, 1988. No significant discrepancies or out-of-tolerance conditions were found. Based on the foregoing considerations the staff concludes that the IE Bulletin 79-14 requirement for conducting an as-built reconciliation of 100%

the Class 2 and 3 piping may be relaxed.

l The staff will pemit the reconciliation to be done using a stati:,tically

? determined sample. Based on a 95/95 confidence level, the acceptable sample size should consist of 55 stress calculations chosen on a random basis from the Class 2 and 3 population of 414 stress calculations. The Class 2 l and 3 scope of stress calculations will be considered acceptable if no stress i or load limits are exceeded and no physical modifications are found to be l required in this sample. (Note that an,v piping reevaluations which might be i necessary should be based on the same it,ading conditions and stress-and-load l limits which formed ,the licensing basis of the original stress calculation.)

8807280159 880718 9 (g DR ADOCK 050

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If any stress or load limits are found to have been exceeded and moaificatians are found to be necessary, HL&P will be required to perform an ABR for all remaining Class 2 and 3-piping systems.

At the completion of the ABR program, HL&P is requested to provide a statistical evaluation of the results, which should contain as a minimum, the number of tolerance exceedances and their magnitude, and a comparison of as-built and as-designed piping stresses, support and nozzle loads where such items were required to be recalculated.

Sincerely, George F. Dick, Jr., Project Manager Project Directorate - IV Division of Reactor Projects - III, IV, V and Special Projects cc: See next page DISTRIBUTION Cocket File NRC PDR Local PDR PD4 Reading L. Rubenstein J. Calvo P. Noonan G. Dick OGC-Rockville E. Jordan B. Grimes L. Marsh P. T. Kuo M. Hartzman T. McLellan ACRS(10)

PD4 Plant File PD4/Lp .; R PM PD4/D f/b PNoonur GDick:sr/kb JCalvo 07/p{/88 07//4/88 07///188 i

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-2 If any stress or load limits are found to have been exceeded and modifications are found to be necessary, HLtP will be required to perform an ABR for all remaining Class 2 and 3 p.iping systems.

At the comp 12 tion cf the ABR program, HL&P is requested to provide a statistical evaluation of the results, which should contain as a minimum, the number of tolerr e exceedances and their magnitude, and a comparison of as-built and as-dei.gned piping stresses, support and nozzle loads where such items were required to be recalculated.

, Sincerely, W

Georgef. F Dick, AJr/., Proje-t Manager Project Directorate - IV t'ivision of Rear.',or Projvets - III, IV, V and Special Projects cc: See ne t page t j l

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

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Brian Berwick, Esq. Resident Inspector / South Texas Assistant t',torney General Project Er.vironmental Protecticn Divisien c/o U.S. Nuclear Regulatory Commission P. O. Box 12548 P. O. Box 910 Capitol Station Bay City, Texas 77414 Austin, Texas 78711 1

Mr. Jonathan Davis Mr. J. T. Westermeier 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

!.r. R. J. Miner Citizens Concerned About Nuclear thief Operating Officer Power City of Austin Electric Utility 10 Singleton 721 Barton Springs Road Eureka Springs, Arkansas 72632 Austin, Texas 73704 Mr. M. A. McBurnett Mr. R. J. Costello Manager, Operations Support Licensing Mr. M. T. Hardt Houston Lighting and Power Company City Public Serfice 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 2166 Washington, D.C. 20036 Houston, Texas 77001 Helbert 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 Mrs. Peggy Buchorn Executive Director Citizens for Equitable Utilities, Inc.

. Route 1, Box 1684 Brazoria, Texas 77422 Mr. S. L. huse..

General Managar, Operations Support Houston Lighting and Power Company P. O. Box 289 Wadsworth, Texas 77483

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

RegfNa1 Administrator, Region IV U.S. Nuclear Regulatory Commission Offica of Execucive Director for Operations 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76011 Mr. Lanny Sinkin, Counsel for Intervenor Citizens Concerned about Nuclear Power, Inc.

3 Christic Institute 1324 North Capitol Street Washington, D.C. 20002 Licensing Representative Houston Ligh'ing and Power Company Suite 610 Three Metro Center Bethesda, Maryland 20814 Rufus S. Scott Associate General Counsel Houston Lighting & Power Company P. O. Box 1700 Houston, Texas 77001 INP0 Records Center 1100 Circle 75 Parkway Atlanta, Georgia 30339 3064 Joseph M. Hendrie 50 Bellport Lane Bellport, New York 11713 Ge old E. Vaughn, Vice President Nuclear Operations Houston Lighting & Power Company 3 P. O. Box 289 Wadsworth, Texas 77483 ,

l R. W. Chewning, Chainnan Nuclear Safety Review Board Houston Lighting & Power Company P. O. Box 289 Wadsworth, Texas 77483

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