Author: Shantel Mistilynn UttonPublisher:
ISBN:
Category :
Languages : en
Pages : 216
Book Description
Risk-informed, Performance-based Regulatory Implications of Improved Emergency Diesel Generator Reliability
Author: Shantel Mistilynn UttonPublisher:
ISBN:
Category :
Languages : en
Pages : 216
Book Description
On Monitoring Nuclear Power Plant Emergency Diesel Generator Reliability
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 56
Book Description
If offsite power is interrupted, the availability of onsite alternating current power supplies is a major factor in assuring acceptable safety at commercial light-water-cooled nuclear power plants. To control the risk of severe care damage during station blackout accidents at a given plant, the reliability of the emergency diesel generators (EDGS) to start and load-run upon demand must be maintained at a sufficiently high level. The minimum EDG reliability, which we denote by RT, is targeted at either 0.95 or 0.975 per nuclear unit consistent with the reliability level that the plant operator assumed in the coping analysis for station blackout. In 1992 the US Nuclear Regulatory Commission (NRC) considered an amendment that would require licensees to test and monitor EDG reliability against performance-based criteria that indicate possible degradation from the EDG target reliability levels. They originally proposed the following set of fixed sample-size triggers for use in monitoring EDG reliability. The purpose of this report is to compare the performance of the proposed triggers with corresponding alternative sequential variable sample-size triggers which potentially permit earlier detection of EDG reliability degradation without significantly increasing the false alarm rate. The comparison is to be done in a simulated use environment by means of Monte Carlo simulation. We are also interested in the inverse conditional probabilities of reliability degradation given that a trigger has occurred.
Emergency Diesel Generator: Maintenance and Failure Unavailability, And Their Risk Impacts, NUREG/CR-5994, U.S. Nuclear Regulatory Commission, November 1994
Author: Enhancement of On-site Emergency Diesel Generator Reliability : Final Report
Author: Gerald L. BonerPublisher:
ISBN:
Category : Diesel motor
Languages : en
Pages : 274
Book Description
Nuclear Regulatory Commission Issuances
Author: U.S. Nuclear Regulatory CommissionPublisher:
ISBN:
Category : Nuclear energy
Languages : en
Pages : 568
Book Description
Use of Performance-monitoring to Improve Reliability of Emergency Diesel Generators
Author: Jeffrey Daniel DulikPublisher:
ISBN:
Category :
Languages : en
Pages : 201
Book Description
Emergency Diesel Generator
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 215
Book Description
Emergency Diesel Generators (EDGs) provide on-site emergency alternating current (ac) electric power for a nuclear plant in the event that all off-site power sources are lost. Existing regulations establish requirements for designing and testing of these on-site power sources to reduce to an acceptable level the probability of losing all ac power sources. Operating experience with EDGs has raised questions about their testing and maintenance to achieve the EDG reliability levels and the total EDG unavailability experienced (fraction of time EDG is out-of-service due to testing, maintenance, and failures). In this report, recent operating experience is used to assess EDG unavailability due to testing, maintenance, and failures during reactor power operation and during plant shutdown. Recent data show an improvement in EDG reliability, but an increase in EDG unavailability due to maintenance, a significant portion of which is due to routinely scheduled maintenances. Probabilistic safety assessments (PSAs) of selected nuclear power plants are used to assess the risk impact of EDG unavailability due to maintenance and failure during power operation, and during different stages of plant shutdown. The results of these risk analyses suggest qualitative insights for scheduling EDG maintenance that will have minimal impact on risk of operating nuclear power plants.
Safety Evaluation Report Related to the Operability and Reliability of Emergency Diesel Generators Manufactured by Transamerica Delaval, Inc
Author: C. BerlingerPublisher:
ISBN:
Category : Emergency power supply
Languages : en
Pages : 36
Book Description
Proposed Staff Actions to Improve and Maintain Diesel Generator Reliability
Author: Performance of Emergency Diesel Generators in Restoring Power to Their Associated Safety Buses
Author: Theodore C. CintulaPublisher:
ISBN:
Category : Emergency power supply
Languages : en
Pages : 19
Book Description