ML20147B161
| ML20147B161 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 02/29/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8803010484 | |
| Download: ML20147B161 (3) | |
Text
'e TENNESSEE VALLEY AUTHORITY CH ATTANOOGA, TENNEST EE 374ol 5N 157B Lookout Place FEB 291988 U.S. Nuclear - Regulatory Comission ATTN: Document Control Desk Washington, D.C.
20555 Gentlemen:
In the' Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
)
50-328 SEQUOYAH NUCLEAR PLANT (SQN) - PROBLEM IDENTIFICATION REPORT (PIR)
SQNCEB8795 - CONSIDERATION OF DIFFERENTIAL SEISMIC ANCHOR MOVEMENTS BETWEEN BUILDINGS PIR SQNCEB8795 identified Civil Engineering Branch / Engineering Mechanics Group concerns relative to Alternate Analysis Category I and I(L) piping and instrument and control lines spanning between buildings. TVA has reviewed existing programs at SQN that cover these areas. The Alternate Analysis Category I piping and instrument and control lines are. covered by the Alternate Analysis Review Program (AARP). The AARP description, SQN-AA-001, indicates that anchcr moveme;.ts are considered. Our letter to NRC, dated April 8,1987, comits to include instrument lines as a postrestart activity under the AARP, phase 2.
For unit 1, the comitment is recorded in the Corporate Comitment Tracking System as NCO 870119 001.
For unit 2, the commitment is recorded as J
NCO 870119 002. In addition, a draft of the Engineering Requirements Specification ER-SQN-EEB-001 indicates that building interfaces are to be considered in all future installations of instrument lines.
The Category I(L) piping is the subject of a data base walkdown performed by Earthquake Engineering, Inc., and included in their report No.-8629-01-04-001.
This report indicates that seismic anchor point movements and, specifically, differential building settlements were considered and "that failure resulting in loss of position / pressure retention is not a credible concern." Procedures for analyzing and supporting future revisions to Category I(L) piping are being developed and will include the consideration of seismic anchor movement including differential building movements. Enclosure 1 documents this TVA comitment.
If any questions exist relative tc the above, please telephone M. R. Harding at (615) 870-6422.
Very truly yours, TENNESSEE VALLEY AUTHORITY
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po30 R. G diey, Di ec or 8803010484 880229
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Nuclear Licensing and
'i PDR ADOCK 05000327 Regulatory Affairs P
'l cc: see page 2 An Equal Opportunity Employer i
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b hhjh8 U.S. Nucle'ar Regulatory Commission r
r cc (Enclosure):
Mr. K. P. Barr, Acting Assistant Director for Inspection Programs TVA Projects' Division.
U.S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. G. G. Zech, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Sequoyah Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy, Tennessee 37379 i
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. Procedures for analyzing and supporting future revisions'to Category I(L) piping, to include the consideration of seismic anchor movements. including differential building motions, will be completed by April 30, 1988.
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