ML20148E094
| ML20148E094 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/18/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8803240454 | |
| Download: ML20148E094 (4) | |
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.s TENNESSEE VALLEY AUTHORITY CHATTANOOGA, TENNipKE 374of
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U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-328 SEQUOYAH NUCLEAR PLANT (SQN) - EQB ENGINEERING (EQE) REVIEW OF CATECORY I(L) PIPING FOR POTENTIAL HAZARDS BECAUSE OF THE DIFFERENTIAL DISPLACEMENT OF INDEPENDENT ADJACENT STRUCTURES
Reference:
TVA letter to NRC dated February 29, 1988, "Sequoyah Nuclear Plant (SQN) - Problem Identification Report (PIR) SQNCEB8795
- Considoration of Differential Seismic Anchor Movements Between Buildings" Enclosed is additional information requested by Winston Liu, of your staff, relative to SQN Problem Identification Report (PIR) SQNCEB8795.
This PIR identified Civil Engineeting Branch / Engineering Mechanics Group concerns relative to Alternate Analysis CateLory I and I(L) piping and instrument and control lines spanning between buildings and the requisite consideration of differential seismic anchor movements for proper analysis of these lines.
The referenced letter provided TVA's discussion of this condition and the programs implemented at SQN to reconcile it and prevent future recurrence.
EH.ased is the EQE assessment of this condition at SQN units 1 and 2 for
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your information and review.
If any additional questions exist, please telephone M. R. Harding at (615) 870-6422.
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Very truly yours, TE"NESSEE VALLEY AUTHORITY
/WD R. Gridley, Direc r Nucle a Licensing and Regulatory Affairs 0[
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- U.S. Nuclear Regulatory Commission FtAR I 81988 cc (Enclosure):
Mr. K. P. Barr, Acting Assistant Dirnetor for Inspection Programs TVA Projects Divisli.,
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 Soday Daisy, Tennessee 37379 l
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/ EQE ENGINEERING CORPORATE OFRCE Sm Fnmasco REGIONAL OFFICES February 17, 1988 se romasco Los k o ne NewYou kam,
Mr. J.L. Purkey EQE Transmittal No.
Tennessee Valley Authority 51001.01 0 006 Office of Engineering 400 W. Summit Hill Crive 5-132 SB-K Knoxville, TN 37902
Subject:
EQE Review of Class 1(L) Piping at Sequoyah Units 1 & 2 for Potential Hazards Due to the Differential Displacement of Independent Adjacent Structures.
Reference:
"Evaluation and Resolution of Category 1(L) Piping Hazards", EQE Report Number 8629-01-04-001, January 1987
Dear Joe:
Per our discussion of 2-17-88, this letter summarizes the EQE evaluation of the subject piping concerrs. Differential displacement of piping anchor points has been shown by experience data to be a cause of damage if the piping does not have sufficient flexibility to accommodate the differential anchor point motion.
For this reason, differential motion of anchor points was an integral part of the EQE evaluation.
The walkdown team considered the Sequoyah postulated building deflections in areas where relative deflection could occur. Areas between the Auxiliary Building and the Reactor Building have a maximum expected relative displacement of less than one-half inch. Other r.reas between the Auxiliary Building and the Turbine, Auxiliary Equipment and COWE Buildings as well as the annulus area between the steel co.ncainment and the Shield Building were reviewed for Class 1(L) piping rigidly supported between two structures.
The walkdown team also considered piping for attributes which mignt intensify differential motion problems such as threaded and mcchanically-coupled piping, pipe bends and elbows, fragile piping appurtenances and corrosion.
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- SAN FRN4CISCO, CA 94105 * (415)d95 5500/ FAX (415)d95 5431/ TELEX (23)296166
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L Mr. J.L. Purkey February 17, 1988 EQE No. 51001.01-0 006 Page 2 of 2 Few instances of creilble differential motion hazards between independent adjacent structures were identified by the EQE walkdown.
These were documented for further evaluation by EQE and found to be acceptable.
Please let me know if I can be of further assistence in this matter.
Very truly yours, k
Steven P. Harris Project Manager EQE Engineering gr/sqnpdm cc: Bill Kagay (telecopy nue.ber 615 751-0247, verify -0467) 1 1
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