ML042040248
| ML042040248 | |
| Person / Time | |
|---|---|
| Site: | Columbia  |
| Issue date: | 01/15/2004 |
| From: | NRC/OE |
| To: | |
| References | |
| FOIA/PA-2004-0243 | |
| Download: ML042040248 (1) | |
Text
Follow-Up Assignment Sheet (Detail)
Page I of I Assigned To: LEE, SAMUEL S Facility: COLUMBIA GENERATING STATION Vendor Name:
Assignment Dt: 01/15/2004 Unit 2 050-00397 Region No.4 rReported By:----
1 50.72 No: 39910 MR No:
TAC No:
i IN No:
Event Dt: 05/2112003 HQ MR No:
Part 21 No:
BL No:
Event Type:
HQ MR Dt:
Briefing No:
LER No:
Inspection Type:
GL No:
Insp. Rpt. No:
IRS No:
RIS No:
PN No:
Approvals:
Submitted by:
Closeout Reviewed by:
Approved by:
Submitted Dt:
Closeout Dt:
Approved Dt:
Event
Description:
TEMPORARY LOSS OF RESIDUAL HEAT REMOVAL PUMP USED FOR SHUTDOWN COOLING "This event notification is being made to report an event that could have prevented the fulfillment or the safety function to remove residual heat.
On May 21, 2003, the plant was shutdown in Mode 5, with reactor pressure vessel (RPV) level being maintained greater than 22 feet above the RPV flange.
Technicians were performing routine maintenance and removed an electrical lead from the wrong relay.
As a result of removing the wrong lead, Residual Heat Removal (RHR) valve RHR-V-9 closed after receiving a close signal.
RHR-V-9 is one of two primary containment isolation valves in the common suction piping to both RHR shutdown cooling loops.
The valve closure caused pump RHR-P-2A to trip resulting in a loss of RHR shutdown cooling, and a loss of forced flow through the reactor core.
Natural circulation was verified. RHR shutdown cooling could have been promptly restored if desired, but the plant remained in natural circulation to support other maintenance activities. The RHR-V-9 isolation logic was reset 31 minutes after the isolation occurred, at which time RHR-A was declared operable.
This event was originally deemed to be not reportable by Columbia.
This 8 hour9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> report is being made 19 days after the event date."
The licensee notified the NRC Resident Inspector.
Assignment:
Determine details and evaluate the reportability issues/questions.