05000282/LER-2010-003
| Prairie Island Nuclear Generating Plant Unit 1 | |
| Event date: | |
|---|---|
| Report date: | |
| 2822010003R00 - NRC Website | |
The four battery rooms (11, 12, 21 and 22) are located in the Turbine Building (TB) on the 695 foot elevation. The battery room equpiment includes both trains of Unit 1 and Unit 2 Batteriesl, Battery Chargers, Safeguards Inverters,` including those that supply Reactor Protection Panels, Event Monitoring and Safeguards Bus Load Sequencers3, and AC and DC distribution panels.
Door 225 is the access from the TB into 11 Battery Room and Door 224 is the access from the TB into 21 Battery Room. Doors 224 and 225 are internal flooding control boundaries. Two access routes per battery room are provided for personnel safety. The access between adjoining battery rooms is through openings in the reinforced concrete block walls. Each of these openings is furnished with a counterweighted gravity sliding Class "A" fire door that is not a flooding control boundary.
On June 9, 2010, Event Notification Report (Event Number: 45997) was made for "BATTERY ROOMS DECLARED INOPERABLE DUE TO POTENTIAL FLOODING".
EVENT ANALYSIS
The current internal flooding licensing basis (as presented on July 13, 2010) is under NRC review.
NSPM's position is that we are within our original licensing basis. Pending NRC final review, a supplement to this LER will be submitted.
SAFETY SIGNIFICANCE
This issue had no nuclear, radiological, industrial, or environmental impact. Internal flooding of the Turbine Building and Battery Rooms did not occur, so the Structures, Systems and Components (SSCs) in the battery rooms would not fail. Therefore, this event did not affect the health and safety of the public.
CAUSE
The current internal flooding licensing basis (as presented on July 13, 2010) is under NRC review.
NSPM's position is that we are within our original licensing basis. Pending NRC final review, a supplement to this LER will be submitted.
1EIIS System Code: El 2 ENS System Code: EE 3 EIIS System Code: JE (N�RC FORM U.S. NUCLEAR REGULATORY COMMISSION 20 366A� LICENSEE EVENT REPORT (LER) -07)�
CONTINUATION SHEET
CORRECTIVE ACTION
The current internal flooding licensing basis (as presented on July 13, 2010) is under NRC review.
NSPM's position is that we are within our original licensing basis. Pending NRC final review, a supplement to this LER will be submitted.
PREVIOUS SIMILAR EVENTS
Component Cooling Susceptible to a Postulated High Energy Line Break" was submitted on January 19, 2009. This LER described a condition where both trains of the component cooling water system were susceptible to a single failure caused by a postulated High Energy Line Break (HELB) in the turbine building.
System Susceptibility to Turbine Building Flooding Due to a Postulated High Energy Line Break, Supplement 1" was submitted April 8, 2010. This LER described a condition where the operability of the Unit 1 Emergency Diesel Generators5 may not be assured during a HELB event.
4 EIIS System Code: CC 5 EIIS System Code: EK