05000255/FIN-2017007-03
From kanterella
Jump to navigation
Jump to search
Finding | |
---|---|
Title | Containment Dome Truss Analysis |
Description | Thedome truss system was originally designed to support the containment liner plate and wet concrete during the construction of the containment dome (i.e., the liner plate initially acted as a form and the truss supported the form). After the concrete cured, the dome truss system was lowered away from the liner and was used to support the safety injection tanks(SITs) and CS system piping and their associated supports. The CS and SIT systemsare both safety-related which were required to be evaluated for seismic loads (self-weight and externally applied loads). The dome truss system would have alsobeen required to be evaluated for seismic loads. The UFSAR,Section 6.1,described the safety-related design function of the SITsystemwas to prevent fuel and cladding damage that could interfere with adequate emergency core cooling, and to limit the cladding-water reaction to less than approximately 1percentfor all break sizes in the primary system piping up to and including the double-ended rupture of the largest primary coolant pipe, for any break location, and for the applicable break time. Also,the SITsystem also functions to provide rapid injection of large quantities of borated water for added shutdown capability during rapid cooldown of the primary system caused by a rupture of a main steam line. UFSAR Section 6.2.1 described the safety-related design function of the CSsystem was to limit the containment building pressure rise and reduce the airborne radioactivity in containment by providing a means for spraying the containment atmosphere after occurrence of a LOCAor a main steam line break.The inspectors requested the design basis analysis of the dome truss system that considers the LOCA loading on the dome truss system as well as the seismic loading due to the applied design loads from the CS and SITsystem. During the time of the inspection, the licensee was unable to locate the dome truss analysis. In response to the inspectors concern, the licensee entered the issue into their CAP asCR 2017-05016, Dome Trusses, dated November 1, 2017. The licensee is investigating the containment dome truss analysis further with the vendor of the dome truss system.This issue is a URI pending additional inspector review of the design basis analysis for the containment dome truss system. (URI 05000255/2017007-03; Containment Dome Truss Analysis) |
Site: | Palisades ![]() |
---|---|
Report | IR 05000255/2017007 Section 1R21 |
Date counted | Dec 31, 2017 (2017Q4) |
Type: | URI: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.21M |
Inspectors (proximate) | J Benjamin B Jose J Bozga J Robbins G Nicely J Zudans M Jeffers |
INPO aspect | |
' | |
Finding - Palisades - IR 05000255/2017007 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Palisades) @ 2017Q4
Self-Identified List (Palisades)
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||