Morning Report for April 29, 2003
Headquarters Daily Report
APRIL 29, 2003
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REPORT NEGATIVE
ATTACHED INPUT RECEIVED
HEADQUARTERS X
REGION I X
REGION II X
REGION III X
REGION IV X
PRIORITY ATTENTION REQUIRED MORNING REPORT - REGION II APRIL 29, 2003
Licensee/Facility: Notification:
Duke Power Co. MR Number: 2-03-0004
Oconee 3 Date: 04/29/03
Seneca,South Carolina
Dockets: 50-287
PWR/B&W-L-LP
Subject: INITIATION OF SPECIAL INSPECTION AT OCONEE NUCLEAR STATION
Discussion:
On April 21, 2003, while testing atmospheric dump valves (ADVs) in
Unit 3 prior to shutting down for its scheduled refueling outage, the
licensee identified a steam leak in the bonnet of the "A" main steam
header ADV isolation valve (3MS-153). In addition, the "B" main steam
header ADV isolation valve (3MS-155) could not be opened when initially
tested. Approximately 1.5 hours later the licensee was able to open
3MS-155; however, this was outside the 40 minute window that the ADVs are
required to be operated for certain accident mitigation sequences.
Compensatory actions were implemented until the ADV function was no
longer required following the Unit 3 shutdown on April 26, 2003.
Historically, the manual valves which comprise the ADV flowpath in all
three Oconee units have experienced problems that have impacted the
operation of the ADVs.
Regional Action:
Region II, under the guidance of NRC management Directive 8.3, initiated
a Special Inspection at the site on April 29, 2003, based on the
repetitive failures and problems which have occurred with the manual
valves that comprise the ADV flowpath.
Contact: Robert Haag (404)562-4550
Page Last Reviewed/Updated Wednesday, March 24, 2021