ML18033A278
| ML18033A278 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 05/26/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML18033A279 | List: |
| References | |
| TAC-00296, TAC-296, NUDOCS 8807180243 | |
| Download: ML18033A278 (8) | |
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,i+~.CELZRATED DIS IBUTION DEMONSTR TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION NBR:8807180243 DOC.DATE: 88/05/26 NOTARIZED: NO DOCKET g
FACIL:50-260 Browns Ferry Nuclear Power Station, Unit 2, Tennessee 05000260 AUTH.NAME AUTHOR AFFILIATION GRIDLEY,R.
Tennessee Valley Authority RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)
SUBJECT:
Requests review of Lead Civil Engineer Instruction BFEP-TI-C3, "Operability Criteria for Misc Steel."
DISTRIBUTION CODE:
D030D COPIES RECEIVED:LTR
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TITLE: TVA Facilities Routine Correspondence NOTES:S.Black 3 cy.1 cy.
ea to: Ebneter,Axelrad,S.Richardson, B.D.Liaw,K.Barr, OI.
05000260 ~
RECIPIENT ID CODE/NAME SIMMS,M MORAN,D INTERNAL: ACRS AEOD OGC 15-B-18 EXTERNAL: LPDR NSIC NOTES:
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9 RECIPIENT ID CODE/NAME PD GEARS,G ADM/LFMB CS-ABSTRACT RE@ FM 01 NRC PDR COPIES LTTR ENCL 1
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TENNESSEE VALLEYAUTHORlTY 5N 157B Lookout Place OOCKETED USHRC MAY26 1988
'88 JII -3 P2:09 U.ST Nuclear Regulatory Commission ATTN:
Document Control Desk Washington, D.C.
20555 OOCKE! 3NG h 5I."'-V3Lf.
!3RANt',4 Gentlemen:
In the Matter of Tennessee Valley Authority Docket Nos. 50-260 BROWNS FERRY NUCLEAR PLANT (BFN) SEISMIC QUALIFICATION OF MISCELLANEOUS STEEL (NRC TAC NO. 00296)
This letter desex'ibes 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 BFN Performance Plan which was transmitted by S.
A. ophite's letter dated July 1, 1987 and by my letters dated March 10, 1988 and April 28, 1988.
This letter ineorpoxates resolutions to the NRC staff's concerns as discussed in our meeting, dated May 18, 1988.
Enclosuxe 1 to this letter desexibes the BFN program for resolving this is'sue, Enclosure 2 to this letter is the interim operability criteria fox'iscellaneous steel, revision 2.
TVA requests youx review of this program and
,the issuance of a written statement documenting the programs acceptability.
Please xefer any questions xegarding this submittal to M. J.
May, Manager, BFN Site Licensing, (205) 729-3570, Very truly yours, TENNESSEE V
EY AUTHORITY R. Gxidley, Dir ctor Nuclear Licensing and Regulatory Affairs Enclosuxes cc:
See page 2
8807180243 880526 PDR ADGCK 05000260 P
PDC An Equal Opportunity Employer
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U.S. Nuclear Regulatory Commission MAY26 1988 cc (Enclosures):
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 Browns Ferry Resident Inspector Browns Ferry Nuclear Plant Route 12, Box 637
- Athens, Alabama 35611
ENCLOSURE 1
TENNESSEE VALLEY AUTHORITY BROVJNS 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 details.
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.
a 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 operabi.lity criteria similar to that used for large bore pipe supports.
The large bore operabili.ty criteria is similar to that used on Sequoyah Nuclear Plant-Unit 2.
For a
comparison of the Sequoyah and Browns Ferry operability criteria, see table l.
Miscellaneous steel which does not meet the design criteria, but is within the interim operability criteria, will be modified to meet the design criteria prior to restart from the next refueling outage.
The miscellaneous steel which does not meet the interim operabi.lity criteria will be modified to meet the design criteria unless specifically requested and approved by NRC on a case by case basis prior to restart.
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 result,ing 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 will be implemented prior to start up after the next refueling outage.
ENCLOSURE 1
TABLE 1 BROWNS FERRY UNIT 2 COMPARISON OF OPERABILITY CRITERIA TECHNICAL ATTRIBUTES TECHNICAL ATTRIBUTES BROWNS FERRY UNIT 2 MISC STEEL OPERABILITY CRITERIA SEQUOYAH UNIT 2 OPERABILITY CRITERIA AI LOWABLE STRES TENSION - AXIAL AND BENDING SMALLER OF 1.2FY OR 0.7FU SMALLER OF 1.2FY OR 0./FU ALLOWABLE STRESS COMPRESSION AXIAL AND BENDING 0.9FCR 0.9FCR ALLOWABLE STRESS SHEAR SMALLER OF 0.72FY OR O a2FV SMALLER OF 0.72FY OR 0.42FU ALLOWABLE BOLT STRESS (TENSION)
FY MIN OR 0.7FU WHEN I Y MIN IS NOT SPECIFIED FY MIN CONCRETE EXPANSION ANCHORS FACTOR OF SAFETY WEDGE AND SHELL TYPE ANCHORS FACTOR OF SAFETY 2 FOR ALL ANCHORS FACTOR OF SAFETY 2 FOR ALL ANCHORS