ML18033A161
| ML18033A161 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 03/10/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML18033A162 | List: |
| References | |
| TAC-00295, TAC-295, TAC-R00295, TAC-R00296, TAC-R00297, TAC-R295, TAC-R296, TAC-R297, NUDOCS 8803170023 | |
| Download: ML18033A161 (6) | |
Text
ACCELERATZD DISlRIBUTION DEMONSTRATION SYSTEM
'REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:8803170023 DOC.DATE: 88/03/10 NOTARIZED: NO FACIL:50-260 Browns Ferry Nuclear Power Station, Unit 2, Tennessee AUTH.NAME AUTHOR AFFILIATION GRIDLEY,R.
Tennessee Valley Authority RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
DOCKET 05000260 I
05000260 g NOTES:G.Zech 3 cy.
1 cy.
ea to: Ebneter,Axelrad,S.Richardson, B.D.Liaw,K.Barr, OI.
SUBJECT:
Discusses seismic qualification of miscellaneous steel forwards Civil Engineering Branch Instruction CEB-C1.102.
DISTRIBUTION CODE:
D030D COPIES RECEIVED:LTR J ENCL SIZE:
) + P TITLE: TVA Facilities Routine Correspondence RECIPIENT ID CODE/NAME JAMERSON,C MORAN,D COPIES LTTR ENCL 1
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1 RECIPIENT ID CODE/NAME PD GEARS,G COPIES LTTR ENCL 1
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A INTERNAL: ACRS RE ILE EXTERNAL LPDR NSIC NOTES 01 1
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9 ADM/LFMB OGC 15-B-18 NRC PDR 1
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- 8 TOTAL NUMBER OF COPIES REQUIRED
LTTR 21 ENCL 19
~ E t
t TENNESSEE VALLEYAUTHORITY CHATTANOOGA, TENNESSEE 37401 5N 157B Lookout Place U. S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 Gentlemen:
In the Matter of
)
Docket Nos.
50-260 Tennessee Valley Authority
)
BROWNS FERRY NUCLEAR PLANT (BFN) SEISMIC QUALIFICATION OF MISCELLANEOUS STEEL This letter describes the BFN program for the seismic qualification of miscellaneous steel.
This letter supplements the information provided by section III.3.9 of revision 1 to the Browns Ferry Nuclear Performance Plan that was transmitted by S.
A. White's letter dated July 1, 1987.
Enclosure 1 to this letter describes the BFN program for resolving this issue.
Enclosure 2 to this letter is the interim operabiltty criteria for miscellaneous steel.
TVA requests your review of this program and the issuance of a written statement documenting the programs acceptability.
Please refer any questions regarding this submittal to M. J.
May, Manager, BFN Site Licensing, (205) 729-3570.
Very truly yours, TENNESSEE VALLEY AUTHORITY Enclosures cc:
See page 2
R. Gridley, Dire or Nuclear Licensing and Regulatory Affairs 8803i70023 8803i0 PDR ADOCK 05000260 P
DCD An Equal Opportunity Employer gd I)
U.S. Nuclear" Regulatory Commission MAR 10 1988 cc (Enclosures):
Mr. K. P. Barr, Acting Assistant Director for Inspection Programs TVA'rojects Division U.S. Nuclear Regulatory Commission
~ 'egion II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30323 Mr. G.
G. Zech, Assistant Director for Projects TVA Projects Division U.S.'uclear Regulatory Commission One White Flint, North 11555 Rockville Pike Rockville, Maryland 20852 Browns Ferry Resident Inspector Browns Ferry Nuclear Plant Route 12, P.O.
Box 637
- Athens, Alabama 35611
ENCLOSURE 1
TENNESSEE VALLEY AUTHORITY BRONNS FERRY NUCLEAR PLANT UNIT 2 MISCELLANEOUS STEEL This report gives TVA's plan to demonstrate the adequacy of miscellaneous steel.
Issue A corrective action report identified discrepancies between the as-constructed condition and design drawings for miscellaneous steel framing that was used for supporting pipes.
Additionally, there was not adequate assurance that the miscellaneous steel framing was analyzed to confirm structural adequacy.
~Back round Miscellaneous steel was installed based on typical framing details which were intended primarily for engineered and field-routed piping supports although HVAC, conduit, and cable tray supports may have been attached.
This typical framing is not part of the plant's main structural support framing or structural features such as stairways or equipment access platforms.
Corrective Action Report 85-059 identified weld and steel details that were not on drawings.
Investigation of this CAR identified generic deficiencies that included installation of miscellaneous steel without documentation on drawings, modifications to steel without drawing update, load changes, or additions that were not evaluated and no engineering documentation for miscellaneous steel framing detai 1 s.
Resolution To address the concerns regarding miscellaneous steel
- framing, an evaluation program was initiated to review miscellaneous steel consistent with the IE Bulletin 79-14 and torus piping programs.
The present scope of this program includes approximately 350 miscellaneous steel frames.
For each of the frames that are being evaluated, a walkdown for attachments will be performed, Using loads from the appropriate
- program, the miscellaneous steel structures will be qualified to design criteria requirements and modifications will be prioritized based on an interim operability criteria similar to that used for large bore pipe supports.
Miscellaneous steel which does not meet the design criteria, but is within the interim operability criteria, will be modified to meet the design criteria before restart from the next refueling outage.
The miscellaneous steel which does not meet the interim operability criteria will be modified to meet the design criteria unless specifically requested and approved by NRC on a case by case basis before restart.
A comparison of operability and design criteria is given in table 1.
The Long-Term Torus Integrity Program has been completed.
The framing which supports the piping analyzed under the torus program has 75 supports and is being evaluated to determine its as-constructed acceptability.
Any modifications to the torus framing will be evaluated for generic implications to the entire scope of miscellaneous steel framing.
The balance of the miscellaneous steel will be evaluated concurrently with the IE Bulletin 79-14 program.
As support loads are developed for the IE Bulletin 79-14 program, the associated miscellaneous steel will be evaluated.
The FSAR commits that systems supported by miscellaneous steel remain functional under seismic loadings.
The design criteria for miscellaneous steel are consistent with the requirements of-the FSAR.
Licensin Issues Issue:
The schedule for the evaluation of the miscellaneous steel will be consistent with the ongoing IE Bulletin 79-14 program.
Modifications will be prioritized based on an interim operability criteria.
Justification:
The use of the operability criteria to prioritize modifications is acceptable, since the structural adequacy and system function will be maintained.
The piping analyzed under the torus program provides a critical case evaluation, since the loads changed significantly due to the Mark I hydrodynamic loads.
Modifications resulting from the walkdown and structural adequacy reviews will be evaluated for generic implications.
The miscellaneous steel qualification program is comprehensive and assures that the steel framing is acceptable.
Modifications required to meet design criteria wil-1 be implemented before start up after the next refueling outage.
TABLE 1
BROWNS FERRY UNIT 2 MISC.
STEEL CRITERIA COMPARISON CHART ADDRESSES DESIGN CRITERIA OP ERABILITY CRITERIA REMARKS ALLOWABLE STRES TENSION
- 5. BENDING
- 0. 9Fy SMALLER OF 1 'Fy OR 0.7Fu SIMILAR TO PIPE SUPPORT OPER-ABILITYCRITERIA ALLOWABLE STRESS COMPRESSION, AXIAL 5 BENDING 0.9Fy 0 9Fc~
SIMILAR TO PIPE SUPPORT OPERABILITY CRITERIA ALLOWABLE STRESS SHEAR 0.4Fy SMALLER OF 0.72Fy OR 0.42Fu SIMILAR TO PIPE SUPPORT OPERABILITY CRITERIA ALLOWABLE BOLT STRESS (TENSION)
Fy GREATER OF 0 7Fu OR Fy OF BOLT SIMILAR TO PIPE SUPPORT 'P ERABILITY CRITERIA ALLOWABLE CONCRETE WEDGE TYPE EXPANSION ANCHORS 4
FACTOR OF SAFETY SHELL TYPE WEDGE AND SHELL 5
FOR TENSION TYPE 4
FOR SHEAR ALL TYPES 2
SIMILAR TO PIPE SUPPORT OPERABILITY CRITERIA