TXX-3414, Proposes Stress Limits to Be Used to Screen ASME Code Class 2 & 3 Stainless Steel Elbows for Acceptable Functional Capability,In Response to SER Open Item.Summary Rept of Evaluation Will Be Transmitted by 820401
| ML20031E304 | |
| Person / Time | |
|---|---|
| Site: | Comanche Peak  |
| Issue date: | 10/06/1981 |
| From: | Schmidt H TEXAS UTILITIES SERVICES, INC. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| TXX-3414, NUDOCS 8110150355 | |
| Download: ML20031E304 (2) | |
Text
,
TEMS UTILITIES SERVICES LNC.
Log # TXX-3414 File # 903.6 200i navas rowsi. n stors.ricxas tsaa,
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G October 6, 1981 F
Dr. Harold R. Denton
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Director of Nuclear Reactor Regulation
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Office of Nuclear Reactor Regulation g}
DCT141981. re-U. S. Nuclear Regulatory Commission Q
Washington, D.s.
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SUBJECT:
COMANCHE PEAK STEAM ELECTRIC STATION FUNCTIONAL CAPABILITY OF ASME CODE CLASS 2 AND 3 STAINLESS STEEL ELB0WS
Dear Dr. Denton:
In response to the Safety Evaluation Report (SER) open item concerning the functional capability of ASME Code Class 2 and 3 stainless steel elbows, CPSES proposes the following stress limitt be used to screen these elbows for acceptable functional capability:
PD Mj B
o +B2 1 1.8 'Sy 1
2t T
(-0.1 + 0.4h) and 0 1 B where B
y1 0.5
=
y and B
0.5 fo:- B 1.0
=
=
y 2
1.3/(h2/3) for =g > 90 I
0.895/(h.912) for =0 0
= 90 B
=
2 0
0 1.0 for
=
=
g Linear interpolation for 0 < =g < 90 h _ tR2 r
Other terms are as defined in NC/ND-3600 of Section III of ASME Code.
The above stress limits will not be applied to those elbows and bends where D /t > 50.
g
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, CPSES proposes to demonstrate that these stress limits have been satisfied by reevaluating the stresses using the above criteria for a random sample of Class 2 and 3 stainless steel elbows in the piping systems listed below:
Safety Injection Chemical and Volume Control Residual Heat Removal Service Water Containment Spray The sample will encompass the full temperature and size range of stainless steel piping. Twenty-five (25) percent of elbows in each system will be sampled.
For those systems where twenty-five
) percent of the elbows is less than five (5), a minimum of five elbows will be evaluated.
It is anticipated that the summary report of the evaluation will be transmitted to the staff by April 1, 1982.
Should you have any questions, please contact me at (214) 653-4782.
Sincerely, H. C. Schmidt-BSD/HCS:tls 1
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