ML20095H235

Forwards Validation Efforts for Comanche Peak Steam Electric Station Unit 2, Per 920109 Meeting W/Nrc.Piping & Piping Supports in Turbine Bldg Completely Supported by Seismic Category 1 Walls

ML20095H235
Person / Time
Site:	Comanche Peak
Issue date:	04/27/1992
From:	William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20095H240	List: ML20095H235 ML20095H241
References
TXX-92215, NUDOCS 9204290313
Download: ML20095H235 (2)

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TUELECTRIC April 27 1992 WUllam J. Cahill, Jr.

Grong. Vice President U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 205b5

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES) - UNIT 2 DOCKCT NO. 50-446 VALIDATION EFFORTS FOR CPSES UNil 2 Gentl emen:

In a' meeting held on January 9 1992, the NRC staff discussed the value of a comprehensive explanation of how the Corrective Action Program (CAP). for Unit'I and arcas common and Unit 1 and 2, was being applied to Unit 2 and a discussion of the accuracy for Unit 2 of the Safety Evaluatu n Report Supplements (SSERs) which were prepared for CAP. Enclosed is the report entitled " Validation Ef forts f or CPSES Unit 2" which addresses these items.

The report reveals no significant issues. The NRC has been kept properly informed of CPSES Unit 2 activities and these activities have been consistent with TV Electric commitments. This document represents a one time effort to consolidate this information and it is not our intention to update this report.

Since approval of the report on April 13, 1992, two additional items have been identified which should have been discussed, The first is an additional difference with SSER 14 which should have been discussed in Section 7.1.2 of the report. Page 74 of Appendix A in SSER 14 states that seismically analyzing non-seismic piping is limited to only those piping systems located in seismically analyzed buildings. In TV Electric letter TXX-92063 dated March 4, 1992, an advance FSAR change was submitted to the NRC to reclassify a portion of the Steam Generator Blowdown piping and pipe supports in the Turbine Building from non-seismic to seismic Category 11.

The piping and piping supports are completely supported by seismic Category I walls. This item was missed by the enclosed report because the letter was in preparation at the same time that the SSER reviews were being performed.

The second item provides an expanded discussion of IE Bulletin 79-14 recor.ciliation as presented near the end of Section 7.1.1 of the enclosed report. This reconciliation either is performed at the end of the process based upon the results of 79-14 walkdowns, or is performed during preparation of stress analyses using a combination of as-built and as-designed data (with a review of subsequent installations to ensure that the as-designed data are consistent with the subsequent as-built installations).

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TO Electric will continue to keep the NRC informed of future Unit 2 activity as appropriate via normal means (e.o.. TV Electric letters, FSAR amendments, etc.). If you have any questions, contact Donald R. Woodlan at (214) 812-8225. l Sincerely, '7 j ,

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William J. Cahill. Jr. '

DRW/grp Enclosure c- Mr. R. D. Martin, Region IV Resident inspectors (2)

Mr. B. E. Holian, NRR

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