NOC-AE-04001823, Addition of Welded Attachments to Piping Systems from Which Arbitrary Intermediate Breaks Were Previously Eliminated

Addition of Welded Attachments to Piping Systems from Which Arbitrary Intermediate Breaks Were Previously Eliminated

ML051450436
Person / Time
Site:	South Texas
Issue date:	11/18/2004
From:	Thomas S South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
NOC-AE-04001823, STI: 31812910
Download: ML051450436 (7)

Text

I Nuclear Operating Company South T7sPrqtcdlcdticGewneJztinSlWon PO. Bcw2S9 dsDr~th. Tz77453 November 18, 2004 NOC-AE-04001823 U. S. Nuclear Regulatory Commission Attention: Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN-499 Addition of Welded Attachments to Piping Systems from which Arbitrary Intermediate Breaks were Previously Eliminated Section 3.6.2.1 of the South Texas Project Safety Evaluation Report, Supplement 3, states:

In addition, during ongoing and future design work, any relocations of, modifications to, or additions of welded attachments to the piping systems in which AIBs are eliminated should be reviewed by the staff to ensure that the enveloping assessments described above still provide adequate protection against pipe breaks resulting from high local stresses due to welded attachments.

As a result of the steam generation replacement plant modifications, there are two locations in each unit where welded attachments were added to piping systems from which arbitrary intermediate breaks (AIBs) were previously eliminated. No welded attachments were relocated, or modified. The additional welded attachments are for spring hangers on the rerouted feedwater piping as documented in the following Design Change Notices (DCNs):

Unit 1 DCN 9704761 Unit 2 DCN 0000065 DCN 9704763 DCN 0000067 DCN 9800678 DCN 0001956 These DCNs have been submitted separately to the Project Manager.

The changes are within previous enveloping assessments provided to the NRC for feedwater piping welded attachments (References 1 and 2) and conform with the stress criteria for elimination of AIBs given in UFSAR Section 3.6.2.1.1. 4 )

STI: 31812910

NOC-AE-04001 823 Page 2 of 3 If there are any questions regarding these added welded attachments, please contact John Conly at (361) 972-7336 or me at (361) 972-7162.

S. E. Thomas Manager, Design Engineering

References:

1. Letter, M. R. Wisenburg to NRC Document Control Desk, "Elimination of Arbitrary Intermediate Breaks," ST-HL-AE-2025, dated April 8, 1987

2. Letter, M. R. Wisenburg to NRC Document Control Desk, "Elimination of Arbitrary Intermediate Breaks," ST-HL-AE-2290, dated July 8, 1987

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