05000456/FIN-2008004-03
From kanterella
Jump to navigation
Jump to search
Finding | |
---|---|
Title | Inadvertent Isolation of Lower Cable Spreading Room Carbon Dioxide Fire Suppression |
Description | On August 8, the licensee performed procedure MA-BR-EM-5-F002, Lower Cable Spreading Room Low Pressure CO2 System Air Actuation Test, in the Unit 2 lower cable spreading room. The automatic CO2 system is the only fire suppression system in the lower cable spreading room, with manual water hose stations and fire extinguishers as a backup. During the surveillance the test, air did not successfully migrate through the flowpath from the CO2 storage tank to the Unit 2 lower cable spreading room discharge nozzles. Troubleshooting activities identified that the sensing lines for the lower cable spreading room discharge valves were not pressurized. Further investigation identified that, on July 23, 2007, a blank flange had been installed on the CO2 system header as part of a permanent modification to the CO2 system in the Unit 1 and Unit 2 upper cable spreading rooms. Installation of the blank flange isolated the sensing lines for the lower cable spreading room. This resulted in isolation of the Unit 1 and Unit 2 lower cable spreading room automatic fire suppression system since July 23, 2007. However, additional information was needed by the inspectors to determine the impact of this condition and allow it to be fully evaluated. At the conclusion of the inspection period, the licensee had completed a modification to move the discharge valve sensing lines so that they were no longer isolated. The licensee also completed post maintenance air puff tests to verify system operability. Pending further review of this issue, it will remain an open URI. (URI 05000456/2008004-03, 05000457/2008004-03) |
Site: | Braidwood ![]() |
---|---|
Report | IR 05000456/2008004 Section 1R05 |
Date counted | Sep 30, 2008 (2008Q3) |
Type: | URI: |
cornerstone | Mitigating Systems |
Identified by: | NRC identified |
Inspection Procedure: | IP 71111.05 |
Inspectors (proximate) | A Garmoe B Dickson J Heath M Mitchell M Munir M Perry R Ng R Skokowski R Wintera Garmoeb Dickson M Holmberg M Mitchell M Perry M Thorpe Kavanaugh R Jones R Ng R Skokowski T Hartman |
INPO aspect | |
' | |
Finding - Braidwood - IR 05000456/2008004 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Finding List (Braidwood) @ 2008Q3
Self-Identified List (Braidwood)
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||