ML20040C286
| ML20040C286 | |
| Person / Time | |
|---|---|
| Site: | Browns Ferry  |
| Issue date: | 11/13/1981 |
| From: | Mills L TENNESSEE VALLEY AUTHORITY |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-SSINS-6820 IEB-80-11, RII:JPO, NUDOCS 8201270488 | |
| Download: ML20040C286 (2) | |
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-L TENNESSEE VALLEY AUTHORATTRO REG;a!r ~
CH ATT/cNOOGA. TENNESSEE 374tfi.I L NTA GECRGTA 400 Chestnut Street Tower II a
81 t 0V 19 All. 04 November 13, 1981 Mr. Ja11es P. O'Reilly,1 Director T '
Office of Inspection and Enforcement U.S. Nuclear Regulatory Commission gy g
j RECEtEED Region II - Suite 3100 101 Marietta Street
,J H [NE6 /ggg Atlanta, Georgia 30303
-11
Dear Mr. O'Reilly:
9 0FFICE,0F INSPECTION AND ENFORCEMENT BULLETIN 80-11
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. y 50-259, -260 -296 - BROWNS FERRY NUCLEAR PLANT ru In my letter to you dated October 1, 1981, TVA provided a revised response to the subject bulletin. Enclosed is a copy of page 2 of that response which was inadvertently omitted from the enclosure to the October 1 response due to an apparent reproduction error.
If you have any questions, please call Jim Domer at FTS 858-2725.
To the best of my knowledge, I declare the statements contained herein are complete and true.
Very truly yours,
~~
TENNESSEE VALLEY AUTHORITY LT M. Mi Is, Manager Nuclear Regulation and Safety Enclosure cc: Office of Inspection and Enforcement (Enclosure)
U.S. Nuclear Regulatory Commission Division of. Reactor Operations Inspection Washington, DC 20555 8201270488 811113 PD.'t ADOCK 05000259 PDR hffg An Equal Opportunity Ernph /er
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implemented by the addition of structural steel restraining elements. The results of our evaluation, as stated above, is summarized in appendix B to this response. TVA's planned methods of restraining the remaining 14 walls are given in appendix C of this response. TVA's methods for analyzing masonry block walls in the reevaluation program are discussed in our response to o -item 2b(iii) and appendix D (TVA Reevaluation Criteria for Concrete Masonry Block Walls at Browns Ferry Nuclear Plant).
RFSPONSE TO ITEM 2B(i) 4 There were four typer of masonry block walls encountered in category I structures at Browns Ferry Nuclear Plant ( BFN) ~. They, are (1) reinforced, (2) nenreinforced hollow core, (3) nonreinforced solid shield block with mortared joints, and (4) solid shield block with nonmortared joints. The function of the walls are to act as shielding or as partitions. They are not main structural load bearing walls. The materials used in construction of the walls were as follows.
Block Hollow core load bearing, lightweight units conforming to American Society for Testing Materials (ASTM) C-90, grade A, in the sites shoan on the drawings. Solid shield block, load bearing, normal weight units conforming to ASTM c-145, 6 inches by 6 inches by 12 inches.
Mortar Medium strength, type S conforming to ASTM C-270.
Grout for cell filling Structuralgradeconcregewithdesigncompressiveof3000 pounds 4
per' square inch (1bs/in ), at 28 days.
Reinforcing steel Vertically - No. 6 bar conforming to ASTM A-4}I (equivalent to A-615, grade 60, yield stress = 60,000 lbs/in ) spaced at the center of the cell, 16 inches on center.
Horh ontally - Equal to Blok-Lok, Corner-Lok, and Partition-Lok as manufactured by AA Wire Products Company, Chicago, Illinois, standard grade with No. 9 gauge side rods ;nl No. 9 gauge crosstiescon{ormingtoASTMA-82(yieldstress=
70,000 lbs/in ).
The horh ontal reinforcing was neglected in the structural r'eevaluation program.'
RESPONSE TO ITEM 2B(ii)
Construction practices used were investigated and evaluated.
TVA personnel which were responsible for the construction of the masonry walls were contacted and the results of the tests
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