ML20070J161

Forwards Sequoyah Nuclear Plant Unit 1,Cycle 6 ISI Rept, Vols 1 & 2

ML20070J161
Person / Time
Site:	Sequoyah
Issue date:	07/18/1994
From:	Powers K TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20070J167	List: ML20070J161 ML20070J173
References
NUDOCS 9407220262
Download: ML20070J161 (3)

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Tennessee Vaky Authonty, Post Office Ebx 2000. S K+y-Dasy. Tennessee 37379-2000 Ken Powers Vice Presdent. Sequoyan Nuclear Plant July 18, 1994 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20c'5 Gentlemen:

In the Matter of ) Docket No. 50-327 i Tennessee Valley Authority )

SEQUOYAH NUCLEAR PLANT (SQN) - UNIT 1 CYCLE 6, 90-DAY IN-SERVICE INSPECTION (ISI)

SUMMARY

REPORT

Reference:

TVA letter to NRC dated March 9, 1992, "Sequoyah Nuclear Plant (SQN) - Unit 1 Cycle 5, 90-Day In-Service Inspection (ISI) Summary Report" Enclosed is SQN's Unit 1 Cycle 6 ISI Summary Report (Volumes 1 and 2) that contains a historical record of repairs, replacements, modifications, ISIS, and augmented ISIS that were performed on American Society of Mechanical Engineers (ASME) Code Class 1 and 2 components from December 20, 1991, to April 20, 1994.

In addition, TVA is utilizing Code Case N-481, " Alternate Examination Requirements for Cast Austenitic Pump CastingsSection XI, Division 1,"

for SQN's reactor coolant pump casing velds. Code Case N-481 was approved for use in Revision 9 of Regulatory Guide 1.147, " Inservice Inspection Code Case Acceptability AS'IE Section XI Division 1."

Appendix IV, Part E of the enclosed ceport contains the evaluation that demonstrates the safety and serviceability of SQN's Unit 1 pump casing.

The evaluation is being submitted to NRC in accordance with Part (e) of Code Case N-481.

The referenced letter contains SQN's previous ISI summary report from the Unit 1 Cycle 5 ISI. The Cycle 5 report ended the inspections on December 14, 1991. This date was based on the last inspection performed during the Unit 1 Cycle 5 refueling outage. The Unit 1 Cycle 6 ISI I O O

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U.S. Nuclear Regulatory Commission Page 2 July 18, 1994 Summary Report began on December 20, 1991, and was based on breaker closure. No ISIS were performed during the six-day interval between December 14 and December 20. For the purpose of eliminating apparent gaps in the reporting periods for ISI summary reports, TVA considers the

" breaker-t n-breaker" approach to be more appropriate for these reports in the future.

This ISI summary report is being provided in accordance with IWA-6220 of the 1977 Edition, Summer 1978 Addenda of ASME Section XI code.

Please direct questione concerning this issue to Don V. Goodin at (615) 843-7734.

Sincerely, Ken Powers Enclosure cc: Mr. D. E. LaBarge, Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852-2739 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy-Daisy, Tennessee 37379-3624 Regional Administrator U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323-2711 1

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• ENCI.0SURE SEQUOYAH NUCLEAR PLANT UNIT 1 CYCLE 6 (Volumes 1 and 2)

UNIT 1 CYCLE 6, 90-DAY IN-SERVICE INSPECTION (ISI)

SUMMARY

REPORT l

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