ML20104A560
| ML20104A560 | |
| Person / Time | |
|---|---|
| Site: | Hartsville  |
| Issue date: | 03/21/1979 |
| From: | Gilleland J TENNESSEE VALLEY AUTHORITY |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7903280370 | |
| Download: ML20104A560 (2) | |
Text
l O
O
~
TENNESSEE '/ ALLEY AUTHC.RITY
- nt ne::.s zv.rss r 274:-
500C Chestnut Street Tower II MAR 211979 Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission W:shington, DC 20555
Dear Mr. Denton:
In the Matter of the Application of
)
Docket Nos. STN 50-518 Tennessee Valley Authority.
)
STN 50-519 STN 50-520 STN 50-521 STN 50-553 STN 50-554 STN 50-566 STN 50-567 For piping to be embedded in concrete at TVA's Hartsville, Phipps Bend, and Yellow Creek Nuclear Plants, a conflict exists between ACI Standard 318-71 and mechanical piping codes, such as, ANSI B31.1, and ASME Section III. The conflict involves minimum test pressures and holding times for leak testing of piping to be embedded in concrete.
A typical leak test requirement from ANSI B31.1 and ASME Section III requires a minimum test pressure of 1.5 times the design pressure to be maintained for a minimum of 10 minutes.
Ecwever, ACI 318-71 Section 6.3.2.4 requires leak testing to be performed at a test pressure of 1.5 times the design pressure, with a minimum of 150 psig to be maintained for four hours.
TVA believes the leak test requirements, for pressure and time identified in the mechanical piping codes, are sufficiently conservative for leak testing of piping to be embedded in concrete.
The leak test requirements specified in ACI-318 will be adopted where no piping code or standard applies.
TVA PSAR's typically state, when referring to ACI-318 for construction
[
of structures, that " modifications to these codes, standards, and specifications are made where necessary to meet the specific l
requirements of the structures." Also for additional consideration, we are providing the enclosure, a copy of a February 1, 1979, letter to the Secretary of the Commission from the ACI-349 Committee.
This letter preposes a revision to ACI-349-76 which agrees with TVA's position en leak testing of piping to be embedded in concrete.
0 Tvovet0Wr g
ff&WW i
o a.
- . e t:
L
9..
.t
. Harold R. Denton Accordingly, TVA plans to revise each PSAR for Hartsville, Phipps Bend, and Yellow Creek to utilize the appropriate mechanical piping code for leak testing of piping to be embedded in concrete.
The revised information will be incorporated into the next PSAR amendment for each respective plant.
very truly yours, J. E. Gilleiand
~ Assistant Manager of Power I