EXTENDED FATIGUE LIFE EVALUATION METHODS FOR AGED LWR COMPONENTS

Award Information
Agency:
Nuclear Regulatory Commission
Branch
n/a
Amount:
$75,000.00
Award Year:
1986
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
1827
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
O'donnell Consulting Engineers
3611 Maplevue Drive, Bethel Park, PA, 15102
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
William J O'donnell
Principal Investigator
() -
Business Contact:
WILLIAM J O'DONNELL
PRESIDENT
() -
Research Institution:
n/a
Abstract
STRESSES DUE TO PRESSURE AND REPEATED THERMAL CYCLING CAUSE PROGRESSIVE MATERIAL DAMAGE DURING THE OPERATION OF LWR COMPONENTS AND PIPING SYSTEMS. THE PRESENT PRO POSED RESEARCH WOULD IMPROVE THE ACCURACY OF EXISTING S- N FATIGUE EVALUATION METHODS BY COMBINING THEM WITH THE ADVANCED TECHNOLOGY OF CRACK PROPAGATION AND FRACTURE MECH ANICS. ENVIRONMENTAL EFFECTS WILL BE INCLUDED IN THE CRACK PROPAGATION DATA USED. WELDMENTS WILL BE INCLUDED BY CONSIDERING RESIDUAL STRESS EFFECTS, COMBINED METALLUR GICAL AND GEOMETRIC NOTCH EFFECTS, EARLY CRACK INITIATION IN THE HEAT AFFECTED ZONE (HAZ), FATIGUE DAMAGE DURING THE WELDING PROCESS AND OTHER EFFECTS NOT INCLUDED IN THE EXIST ING S-N FATIGUE EVALUATION METHODS. THE RESULTING GENERAL METHODS OF EVALUATING THE SAFE EXTENDED FATIGUE LIFE OF AGED COMPONENTS AND PIPING WILL BE QUALIFIED BY COMPARISON WITH OPERATING EXPERIENCE ON ACTUAL HARDWARE INCLUDING RELEVANT NON-NUCLEAR EXPERIENCE.

* information listed above is at the time of submission.

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