Item B-23: LMFBR Fuel
DESCRIPTION
This NUREG-0471[1]task covers a spectrum of technical efforts related to the staff review of LMFBR fuel designs. The efforts include: (1) evaluating lice
Item B-22: LWR Fuel
DESCRIPTION
Historical Background
Individual reactor fuel rods sometimes fail during normal operations and many fuel rods are expected to fail during severe accidents.
Item B-21: Core Physics
DESCRIPTION
The NRC staff has a variety of ongoing or planned technical activities related to core physics. For the most part, these activities are directed at improving the NRC staff's analytical and computer capabilities fo
Item B-20: Standard Problem Analysis
DESCRIPTION
Most vendors, in the conduct of internal audits of emergency core cooling performance computer codes, discovered errors in coding and/or logic which had significant effects on the pr
Item B-19: Thermal-Hydraulic Stability
DESCRIPTION
Historical Background
The possibility of thermal-hydraulic instability in a BWR had been investigated by GE since the start-up of early BWRs.
Item B-18: Vortex Suppression Requirements for Containment Sumps
DESCRIPTION
A number of applicants for operating licenses have been performing sump tests to demonstrate ECCS operability during the recirculation phase following a postulated loss-of-coolant accident.
Item B-17: Criteria for Safety-Related Operator Actions
DESCRIPTION
Historical Background
This NUREG-0471[1]item involved the development of a time criterion for safety-related opera
Item B-16: Protection Against Postulated Piping Failures in Fluid Systems Outside Containment
DESCRIPTION
Historical Background
SRP[1]Section 3.6, issued in 1975, addressed pipe breaks outside containment by combining li
Item B-15: CONTEMPT Computer Code Maintenance
DESCRIPTION
The CONTEMPT computer code is used by the NRC staff to perform independent containment analyses.
Item B-14: Study of Hydrogen Mixing Capability in Containment Post-LOCA
DESCRIPTION
Consistent with the guidelines of Regulatory Guide 1.7,[1]the prevention of local hydrogen concentrations in excess of 4% by volume after a LOCA requires