ML19254F432
| ML19254F432 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 11/06/1979 |
| From: | Mcduffie M CAROLINA POWER & LIGHT CO. |
| To: | Parr O Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7911090418 | |
| Download: ML19254F432 (27) | |
Text
i Carolina Power & Light Company November 6, 1979 Mr. Olan D. Parr, Chief Light Water Reactors Branch No. 3 Division of Project Management United States Nuclear Regulatory Commission Washington, D.C.
20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NOS. 1, 2, 3 AND 4 DOCKET NOS. 50-401, 50-402, 50-403, 50-404 SEISMIC CATEGORY I FILL AND BACKFILL IN CLASS I PIPING AND DUCT BANK AREAS
Dear Mr. Parr:
On June 12, 1979 Carolina Power & Light Company (CP&L) submitted contour profiles, test procedures, typical backfill descriptions, and engineering analyses and criteria for previously placed material between plant coordinate N230 and Tank Building No. 1.
CP&L committed to provide information on the remaining Category I piping and duct bank areas on a future date. Based on changes made by CP&L to paragraph 4.4 of Technical Procedure TP-02 " Soil Control Program - Fill and Backfill for Plant Grade, Plant Building and Reservoir Concrete Structures", your office advised NRC Region II of the acceptability of our program.
Submitted with this letter are the plans and profiles of original ground and fill contours, and locations for all remaining Class I piping and electrical conduit. An abrupt change in the depth of backfill will occur near the foundation walls of Category I structures where the lines leave or enter such structures. To avoid any settlement and restrictions on the construction activities around the structures, Class I piping will be supported by 2000 psi concrete as shown on the enclosed Drawing CAR-2167 G-0488. The ends of electrical conduits are not anchored in the wall and pass through sleeves with elastic boots which permit free movement in any direction.
For areas where Class I piping and duct bank systems will be placed on fill material, the following requirements per paragraph 4.4 of TP-02 will be followed:
1.
In-place density testing shall be completed in previously placed fill during excavation at 5 ft. and 7.5 ft. below the surface and at the elevation required for setting pipe or duct bank. This applies to all fill except blasted random rockfill. Note: The 12 inch sandcone, in accordance with ASTM D1556, shall be used for ripped material.
2.
The test frequency of tests shall be one for every 75 linear feet of trench approximately along the centerline.
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Mr. Olan D. Parr, Chief 3.
A proctor curve in accordance with ASTM D698 (or a "one point proctor" to verify an existing curve) shall be developed for each density test.
4.
A nonconformance report shall be issued and the Area Engineer shall be notified if the in-place density is below 95% Standard Proctor.
5.
After density testing is completed and prior to placing bedding material, the entire surface area of fill material shall be proof rolled to identify any soft fill material.
6.
Proof rolling shall be completed with four passes of a sheepfoot or vibratory roller under 100% monitoring by a qualified soil inspector. The Area Engineer shall be notified if any soft areas are identified prior to removal and replacement with suitable material.
Carolina Power & Light Company believes this information adequately addresses your request for information on all remaining Class I piping and duct bank areas placed in fill. Please formalize your technical concurrence with our criteria so we may continue construction activities in the subject areas. Contact us if you desire any discussion or clarification of this submitted material.
Yours very truly, k
M. A. McDuffie Senior Vice President Engineering & Construction MAM/j cb Attachment cc:
Mr. James P. O'Reilly (w/ attachment)
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