ML20214G731
| ML20214G731 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 04/11/1974 |
| From: | Deyoung R US ATOMIC ENERGY COMMISSION (AEC) |
| To: | Hendrie J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| CON-WNP-0074, CON-WNP-74 NUDOCS 8605220448 | |
| Download: ML20214G731 (2) | |
Text
.
'o APR 11 1974 LWR l-2 :74-7 Docket No.
50-397T g
Joseph M. Hendrie, Deputy Director for Technical Review, L TECINICAL ASSISTANCE REQUEST PLANT:
WPPSS Nuclear Project No. 2 (formerly Hanford-2)
STATUS:
Post-CP Review BRANal:
LUR l-2 PROJECT MANAGER: John Orndoff TR BRANQ1ES INVOLVED: Mechanical Enginecring, Structural Engineering DATE REQUIRED:
May 15, 1974 REF:
Letter from J. J. Stein, Washington Public Power Supply Systen, to A. Giambusso dated March 19, 1974, with attached technical report (WPPSS 74-2-R1, Protection Against Pipe Breaks Inside Containment).
Description of Request: Technical Assistance is requested to evaluate the submittal by WPPSS on protection against pipe breaks inside containment.
This is a post-CP item identified in the SER. The pertinent section of the SER is reproduced below for reference.
4.4 Pipe Whip Criteria The applicant's position on pipe rupture criteria agrees substantially I
with the proposed ANS 20.2 " Design Basis for Protection Against Pipe Whip." For piping within the reactor ecolant pressure boundary the proposed criteria postulate ruptures at all terminal points and at any intermediate points where either the cumulative usage factor (fraction of fatigue life to be used) exceeds 0.2 or the elastically calculated primary plus secondary stresses exceed 2.0 times the code allowable
[
stress intensity. Additional breaks are postulated at one intermediate point between terminal points in each coordinate plane of the piping or branch run in each run with less than three break locations deter-mined on a stress or usage factor basis. Based on the above criteria 8605220448 740411 l
PDR ADOCK 05000397 l
E PDR I
i APR 11 1974 Joseph M. liendrie for locating pipe breaks, the applicant will perforn a dynan:ic analysic to determine the locations of appropriate pipe supports and restraints.
Wo have concluded that implementation of the above criteria will provide acceptable protection against the dynamic effects associated with a LOCA.
Pipe whip was also mentioned in Supplement 1 to the SER as given below.
2.2 Pipe Whip As outlined in section 4.4 of the Safety Evaluation, we have concluded that the applicant's design criteria for protection against pipe whip when implemented will provide acceptable protection against the dynamic effects associated with a LOCA. We will follow the progress of the pipe whip design to assure that the criteria are adequately implemented.
A determination by the staff is required of the adequacy of WPPSS's submittal on protection against pipe breaks inside containment.
R. C. DeYoung, Assistant Director for Light Water Reactors, Group 1 Directorate of Licensing cc:
W. Mcdonald R. W. Klecker R. Maccary J. Knight L. C. Shao J. Orndoff S. Varga D. Eisenhut DISTRIBUTION:
Docket File LWR l-2 File R. C. DeYoung W. R. Butler omer >..L: LWR l-2 L: LWR l-2 L:AD/
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Form AECats (Re. 9-53! AEE0240
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