ML030850736
| ML030850736 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 05/18/2002 |
| From: | Katrina King Electric Power Research Institute |
| To: | Wetzel B Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2003-0018 | |
| Download: ML030850736 (3) | |
Text
I File from Steve Long's computer dated 05/20/02 11:53am named "PFM Flowchart for Steve Long.mlm" From:
"King, Christine" <CKing@epri.com>
To:
"Beth Wetzel (E-mail)" <baw@nrc.gov>
Date:
5/18/02 4:44PM
Subject:
PFM Flowchart for Steve Long Beth I have attached the PFM flowchart requested by Steve Long. I trust that you will get this to him Again, thanks for all your help Christine King, EPRI Manager, Materials Reliability 3412 Hillview Avenue, Palo Alto, CA 94303 Phone: (650) 855-2605 Fax: (650) 855-2002
<<MRPer Flowchart May.pdf>> <<MRPER_FIChrt May page 2.pdf>>
CC:
"Larry Mathews (E-mail)" <lkmathew@southernco.com>, "Kurt Cozens (E-mail)" <koc@nei.org>, "Pete Riccardella (E-mail)" <priccard@structint.com>
rile from Steve Long's computer dated 05/20/02 11:52am named "MRPer Flowchart May.pdf" MRPERCRD, Rev 2 Get random parameters for leaking crack (Fit. daldt. Critical Crack Size)
Save Results Failure Modes:
Leak or NSC Failure Counter:
Crk,Nozzle, TopHead K matrices indexed to:Interference Fit, Yield Strength, UpHill, DownHill Center, Middle &
Outer Nozzle Yes Yes Random:
Leak Time
- of Cracks, Location: (UpHill or DownHill)
Initial Crack Size Random. for Inspection (<0.5*thk)
Deterministic: after leakage All cracks are OD Yield Strength, Yes
File from Steve Long's computer dated 05/20/02 2.pdf' 11:53am named "MRPERFIChrt May page Definition of K Matrices Crack Crack Depth (a/t)
Length 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Lmin L-xx
~~xx
~~xx
~xx xx xx xx xx Notes: L, is defined as the length of the axial crack + length of the branch crack =200 circumferential length (This length is assumed when leakage is detected)
L2 is defined as the length of the axial crack + length of the branch and circumferential crack = 1800 circumferential length Lcrit is the length of the critical crack size from net section collapse Lmin is the minimum initial crack length
-- means no entries in the table, reserved for future use xx: K results at crack tip from FEM analyses for the composite crack One matrix will be developed for each of the following situations:
(a) Min Shrink Fit, Low Yield Strength (b) Min Shrink Fit, High Yield Strength (c) Max Shrink Fit, Low Yield Strength (d) Max Shrink Fit, High Yield Strength One set of the above four matrices is formulated for each of the following nozzle category and crack location:
(a) Center Nozzle (b) Middle Nozzle, Up-Hill Crack (c) Middle Nozzle, Down-Hill Crack (d) Outer Nozzle, Up-Hill Crack (e) Outer Nozzle, Down-Hill Crack K is interpolated for a given crack length, shrink fit, and yield strength. The particular set of matrices used in interpolation depends on nozzle category and crack location