FEPs Screening of Processes and Issues in Drip Shield and Waste Package Degradation
As directed by a written development plan (BSC 2002 [DIRS 161132]), the primary purpose of this scientific analysis is to identify and document the analyses and resolution of the features, events, and processes (FEPs) affecting the waste package and drip shield performance in the repository. Thirty-three FEPs were identified that are associated with the waste package and drip shield performance. This scientific analysis has been prepared to document the screening methodology used in the process of FEP inclusion and exclusion. The scope of this scientific analysis is to identify the treatment of the FEPs affecting postclosure waste package and drip shield performance. It should be noted that seismic effects are not treated within this report. A full discussion of seismic effects is contained in the ''Engineered Barrier System Features, Events, and Processes'' report (BSC 2004 [DIRS 167253]). The FEPs that are deemed potentially important to repository postclosure performance are evaluated, either as components of the total system performance assessment (TSPA) or as a separate discussion in a scientific analysis report. The scope for this activity involves two tasks, namely: Task 1: Identify which FEPs are to be considered explicitly in the TSPA (called included FEPs) and in which scientific analyses these FEPs are addressed. Task 2: Identify FEPs not to be included in the TSPA (called excluded FEPs) and provide justification for why these FEPs do not need to be a part of the TSPA model. The analyses documented in this scientific analysis are for the license application (LA) base case design (BSC 2004 [DIRS 167040]). In this design, a drip shield is placed over the waste package and no backfill is placed over the drip shield (BSC 2004 [DIRS 167040]). Each FEP may include one or more specific issues that are collectively described by a FEP name, a FEP description, and descriptor phrases. The FEP Description may encompass a single feature, process or event, or a few closely related or coupled processes provided that the entire FEP can be addressed by a single specific screening argument or TSPA disposition. Descriptor phrases provide additional detail about the subject and content of the FEP beyond the FEP name and description. The FEPs have been assigned to associated scientific analyses. The assignments were based on the nature of the FEPs so that the analysis and resolution for screening decisions reside with the subject-matter experts in the relevant disciplines. This scientific analysis addresses the screening decisions associated with the FEPs for the Performance Assessment Project Waste Package Degradation Modeling group.
- Research Organization:
- Yucca Mountain Project, Las Vegas, NV (United States)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC28-01RW12101
- OSTI ID:
- 836515
- Report Number(s):
- ANL-EBS-PA-000002, Rev. 02; DOC.20040408.0001, DC No. 33848; TRN: US0500671
- Resource Relation:
- Other Information: PBD: 26 Mar 2004
- Country of Publication:
- United States
- Language:
- English
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FEPs Screening of Processes and Issues in Drip Shield and Waste Package Degradation
ENGINEERED BARRIER SYSTEM FEATURES, EVENTS AND PROCESSES