05000280/FIN-2009004-03
From kanterella
Jump to navigation
Jump to search
Finding | |
---|---|
Title | Inadequate Tornado Protection for Engine-Driven Emergency Service Water Pumps 1-SW-P-1A/B/C |
Description | The inspectors identified a Green NCV of 10 CFR 50, Appendix B, Criterion III, Design Control. The design change for the emergency service water pumps (DC-SU-08-0001) was not adequate to protect the diesel-driven emergency service water pumps from damage resulting from a tornado missile as required by the UFSAR (CRs 337720, 337337, 341557). Pending resolution, interim compensatory measures have been established to provide assurance the pumps will be capable of performing their safety function. The finding, associated with the design control attribute of the mitigating systems cornerstone, is more than minor because it adversely affected the cornerstone objective of ensuring the availability, reliability, and capability of systems that respond to initiating events to prevent undesirable consequences. The finding, evaluated per MC-0609, Appendix A, Determining the Significance of Reactor Inspection Findings for At-Power Situations, was determined to be of very low safety significance (Green) because of the extremely low initiating event frequency for a tornado. A phase III risk analysis was performed because the finding screened potentially risk significant for a severe weather initiating event. This finding has a cross-cutting aspect in the area of human performance, resources, because the licensees design documentation for DC SU-08-0001 and ET-S-08-0032 was not complete and accurate which led to the installation of inadequate modifications on ESWPs 1-SW-P-1A/1B/1C (H.2.c) |
Site: | Surry ![]() |
---|---|
Report | IR 05000280/2009004 Section 1R18 |
Date counted | Sep 30, 2009 (2009Q3) |
Type: | NCV: Green |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.18 |
Inspectors (proximate) | C Welch D Arnett G Mccoy J Nadel |
CCA | H.7, Documentation |
INPO aspect | WP.3 |
' | |
Finding - Surry - IR 05000280/2009004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Surry) @ 2009Q3
Self-Identified List (Surry)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||