ML19263F401
| ML19263F401 | |
| Person / Time | |
|---|---|
| Issue date: | 01/08/1980 |
| From: | Shao L Office of Nuclear Reactor Regulation |
| To: | Hazelton W, Taboada A Office of Nuclear Reactor Regulation, NRC OFFICE OF STANDARDS DEVELOPMENT |
| References | |
| NUDOCS 8001280097 | |
| Download: ML19263F401 (12) | |
Text
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UNITED STATES
[
g NUCLEAR REGULATORY COMMISSION 3
.C WASHINGTON. D. C. 20555 a
JANUARY 8 1380 MEMORANDUM FOR: Those on Attached List FROM:
Larry C. Shao, Chairman PWR Pipe Crack Study Group
SUBJECT:
FORTHCOMING MEETING OF PWR PIPE CRACK STUDY GROUP Date & Time:
Friday, January 11, 1580 8:30 am - 5:00 pm Location:
Phillips Building Room P-114
Purpose:
To discuss current progress and schedule of PCSG investigation.
Participants:
Pipe Crack Study Group Members 3
o i
Larry C. Shao, Chairman PWR Pipe Crack Study Group
Enclosure:
Meeting Agenda cc: See next page 1817 120 soon s o mq.
Memorandum for: JMUMY 8 M
L. Shao, NRR/RES S. Bush, PNWL W. Hazelton, NRR A. Taboada, SD J. Muscara, RSR C. Cheng, NRR R. Gamble, NRR R. Woodruff, I&E V. Noonan, NRR R. Bosnak, NRR J. Burns, RES T. March, NRR V. Panciera, NRR 1817 121
AGENDA I.
Introduction II. Study Group Charter and Schedule III. Sub-Task Group 5tatus Sub-Task 1 - Defining the Cracking Mechanism - W. Hazelton Sub-Task 2 - Significance of Cracking - V. Panciera Sub-Task 3 - Detemine Cause of Cracking - R. Gamble Sub-Task 4 - ISI and Leak Detection - C. Cheng Sub-Task 5 - Review Ongoing Programs and Recommended New Programs - J. Muscara Sub-Task 6 - Report Organization - S. Bush IV. Technical Discussion V.
Sumary NOTE: PCSG Members should attend the Feedwater Pipe Crack Meeting January 10, 1980, in P-422 if possible.
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P GA fcc w nt2x @d7 ILLUSTRATION OF~HOW LOCAL THERMAL STRESSES MAY BE GENERATED a
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GENERAL. LOCATION HOT 0F CRACKS J- /
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(5
. or MORE)
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HEAT FLOW d '
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MIXING ZONE
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STEAM SENERATOR WALL
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A, FEECWATER lf LI"E FOR HOT STANDBY CONDITIO"5 MIXING ZONE MAY HAVE
. TEMPERATURE GRADIENTS (STRATIFICATION:
CYCLIC TEMPERATURES AT METAL SURFACE (HYDRAULIC EDDIES) 7 6
A 0W FLOW, 1
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THERMAL STRESSES IN A LINE WITH STRATIFIED FLOW HOT WATER MIXING H
ZONE p
UAA/UNNA e
COLD WATER C
1.
HIGH CYCLE STRESSES AT METAL SURFACE IN MIXING ZONE (SHALLOW PENETRATION) 2.
LOW CYCLE AXIAL AND TANGENTIAL STRESSES DUE TO TEMPERATURE DIFFERENCES TOP TO BOTTOM (DEPEND ON INTERFACE LEVEL AND THICKNESS OF MIXING ZONE) 3.
TRANSIENT THROUGH-WALL BENDING STRESSES AS LEVEL OF MIXING ZONE (FLOW RATE) CHANGES OR AS TEMPERATURES CHANGE (ALL STRESSES ROUGHLY PROP 0RTIONAL T0 (TH-T)
C 1817 124
Meeting Notice JANUARY 8 IS60 DISTRIBUTION Central Files NRC PDR EP Reading NRR Reading H. R. Denton E. G. Case R. Minogue S. Levine V. Stello G. Arlotto F. Schroeder T. Murley N. Moseley E. Igne Receptionist (PhillipsBuilding) 0 ELD OI&E (3)
OSD b R. Buchanan C
16) 1817 125