United States Nuclear Regulatory Commission - Protecting People and the Environment

Morning Report for April 26, 2006

Headquarters Daily Report

To top of page

REGION II

FARLEY SPECIAL INSPECTION TO REVIEW UNIT 1 MAIN STEAM ISOLATION VALVE FAILURES

Licensee/Facility:

SOUTHERN NUCLEAR OPERATING CO., INC.
Farley 1, Farley 2
ASHFORD, Alabama
Dockets: 05000348, 05000364
[1] W-3-LP, [2] W-3-LP
License No:
Notification:

MR Number: 2-2006-0002
Date: 04/26/2006

Discussion:

On or around April 8, 2006, the licensee conducted an as-found closure test of the Unit 1 main steam isolation valves (MSIVs) following unit shutdown for a scheduled refueling outage. Two of three outboard MSIVs failed to move and one outboard MSIV achieved only a partial stroke. All inboard MSIVs, which are of similar design, appear to have functioned properly and fully closed. The circumstances of this event met the NRC Management Directive 8.3, "NRC Incident Investigation Program," deterministic and conditional risk criteria for increased NRC response.

On April 24, 2006, the licensee successfully performed a partial movement test of the Unit 2 MSIVs which provided some assurance that the Unit 2 valves are operable. However, the Special Inspection will review the root cause analysis of the MSIV failures and continue to assess any implications of the Unit 1 failures on the Unit 2 MSIV operability evaluation.

The Special Inspection will identify the circumstances surrounding this event and review the licensee's actions following discovery of the conditions.

Accession Numbers:

Accession No Accession Date
ML061160573 04/26/2006

Contacts:

Name Office Abbrev Phone No E-Mail
SHAEFFER, SCOTT M R2 (404) 562-4521 SMS@nrc.gov
Page Last Reviewed/Updated Thursday, March 29, 2012