ML18033A189
| ML18033A189 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 04/28/1988 |
| From: | Gridley R TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| Shared Package | |
| ML18033A190 | List: |
| References | |
| TAC-00296, TAC-296, NUDOCS 8805050087 | |
| Download: ML18033A189 (11) | |
Text
REGUL*T INFORMATION DISTRIBUTION STEM (RIDS)
ACCESSION NBR: 8805050087 DOC. DATE: 88/04/28 NOTARIZED:
NO DOCKET 8 FACIL: 50-260 Broens Ferry Nuclear Poeer Station>
Unit 2.
Tennessee 05000260 AUTH. NAME AUTHOR, AFFILIATION GR IDLEY> R.
Tennessee Val leg Authority REC IP. NAME RECIPIENT AFFILIATION Document Control Branch
<Document Control Desk)
SUBJECT:
Describes program for seismic qualification of miscellaneous steel. Ltr incorporates resolutions to NRC concerns discussed in 880318 meeting. Rev 1 to interim operability criteria for miscellaneous steel encl. Requests reviee of program.
DISTRIBUTION CODE.
D030D COPIES RECEIVED. LTR 3
ENCL Q SIZE TITLE:
TVA Facilities Routine Correspondence NOTES: Q. Zech 3 cg.
1 cg.
ea to:
Ebneter> Axe lrad> S. Richardson>
B. D. Liam> K. Barr>
OI.
05000260 REC IP IENT ID CODE/NAME JAMERSON> C MORAN> D COP IES LTTR ENCL 1
1 1
1 RECIPIENT lD CODE/NAME PD GEARS> G COPIES LTTR ENCL 1
1 1
1 INTERNAL:
ACR S AE F
EXTERNAL:
LPDR NSIC NOTES:
01 1
1 1
1 1
1 1
1 1
1 ADM/LFMB OGC 15-B-18 NRC PDR 1
0 1
0 TOTAL NUMBER OF COPIES REQUIRED:
LTTR 21 ENCL iV
~ '
C
~ ~
t l
TENNESSEE VALLEYAUTHORITY CHATTANOOGA. TENNESSEE 37401 5N 157B Lookout Place APR RS 588 U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Nashington, D.C.
20555 Gentlemen:
In the Matter of Tennessee Valley Authority Docket No. 50-260 BRONNS FERRY NUCLEAR PLANT (BFN) SEISMIC QUALIFICATION OF MISCELLANEOUS STEEL (NRC TAC NO. 00296)
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 BFN Performance Plan which was transmitted by S.
A. Hhite's letter dated July 1,
- 1987, and by my letter dated March 10, 1988.
This letter incorporates resolutions to the NRC staff's concerns as discussed in our meeting, on March 18, 1988.
Enclosure 1 to this letter describes the BFN program for resolving this issue.
Enclosure 2 to this letter is the interim operability criteria for miscellaneous steel, revision 1.
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. Gri ey, Direc or Nuclear Licensing an Regulatory Affairs 8805050087 880428
)
PDR ADQCI( 05000260 P
PDR An Equal Opportunity Employer
U.S. Nuclear Regulatory Commission APR 88 1888 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 Rockvi lie Pike Rockville, Maryland 20852 Browns Ferry Resident Inspector Browns Ferry Nuclear Plant Route 12, P.O.
Box 637
- Athens, Alabama 35611
'~K"i 6R NlA
ENCLOSURE 1
TENNESSEE VALLEY AUTHORITY BROHNS 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 (CAR)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.
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.
The large bore operability 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 1.
Miscellaneous steel which does not meet the design criteria, but is within the interim operability criteria, wi 1 1 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 wi 11 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 2.
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.
Licensln 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'dequacy 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 before start up after the next refueling outage.
ENCLOSURE 1
TECHNICAL ATTRIBUTES ALLOWABLE STRES TENSION AXIAL AND BENDING TABLE 1
BROWNS FERRY UNIT 2 COMPARISON OF OPERABILITY CRITERIA TECHNICAL ATTRIBUTES BROWNS FERRY UNIT 2 MISC STEEL OP ERABILITY CRITERIA SMALLER OF 1.2Fy OR 0.7Fu SEQUOYAH UNIT 2 OPERABILITY CRITERIA SMALLER OF 1
2Fy OR 0.7Fu ALLOWABLE STRESS COMPRESSION AXIAL AND BENDING 0 9FcR 0.9Fcg ALLOWABLE STRESS SHEAR SMALLER OF 0.72Fy OR 0.42Fu SMALLER OF 0.72Fy OR 0.42Fu ALLOWABLE BOLT STRESS (TENSION)
Fv niw OR 0.7Fu WHEN Fy pig IS NOT SPECIFIED Fv nI w 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
ENCLOSURE 1
TABLE 2 BROWNS FERRY UNIT 2 MISCELLANEOUS STEEL CRITERIA COMPARISON CHART ADDRESSES DESIGN CRITERIA OP ERABILITY CRITERIA REMARKS ALLOWABLE STRESS TENSION 5 BENDING 0.9Fy SMALLER OF 1.2Fy OR 0.7Fu SAME AS PIPE SUPPORT OPERABILITY CRITERIA ALLOWABLE STRESS COMPRESSION, AXIAL 8( BENDING 0.9Fy 0 9FcR SAME AS PIPE SUPPORT OPERABILITY CRITERIA ALLOWABLE STRESS SHEAR 0.4Fy SMALLER OF 0.72Fy OR 0.42Fu SAME AS PIPE SUPPORT OPERABILITY CRITERIA ALLOWABLE BOLT STRESS (TENSION)
Fv Fy OF BOLT OR 0.7Fu IF Fy NOT.
SPECIFIED SAME AS PIPE SUPPORT OPERABILITY 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
SAME AS PIPE SUPPORT OPERABILITY CRITERIA