ENS 46955
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ENS Event | |
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15:52 Jun 7, 2011 | |
Title | Nonconservative Valve Actuator Program Software |
Event Description | In Kalsi Engineering Valve and Actuator Program (KVAP) Error Report 2011-02, Kalsi Engineering identified an error in the KVAP software that provides default flow and torque coefficients for ball and plug valves which can affect margin predictions. Communication between Kalsi and Duke Energy personnel confirmed that non-conservative torque values were calculated for select ball valves used at Oconee for containment isolation. As a result of the Kalsi error, the non-conservatively calculated torque values resulted in negative actuator margins, calling into question the actuators' capability to close the valves under all design conditions. Therefore, it has been determined that the KVAP software program error constitutes a defect, reportable under 10CFR21.
Four safety-related containment isolation valves in the High Pressure Injection system were impacted, requiring entry into TS 3.6.3, Containment Isolation Valves, on two Oconee units [Units 2 and 3]. Unit 1 was shutdown for a refueling outage at the time of this event and the actuator spring was replaced during the outage. The valves on units 2 and 3 required a Notification of Enforcement Discretion (NOED) which occurred on June 2, 2011. Three of the four valves were declared operable on June 10, 2011 and the remaining valve was declared operable the next day. The licensee notified the NRC Resident Inspector. |
Where | |
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Oconee ![]() South Carolina (NRC Region 2) | |
Reporting | |
10 CFR 21.21 | |
LER: | 05000270/LER-2011-001 |
Time - Person (Reporting Time:+144.2 h6.008 days <br />0.858 weeks <br />0.198 months <br />) | |
Opened: | Sandra Severance 16:04 Jun 13, 2011 |
NRC Officer: | Mark Abramovitz |
Last Updated: | Jun 13, 2011 |
46955 - NRC Website
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Unit 1 | |
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Reactor critical | Not Critical |
Scram | No |
Before | Refueling (0 %) |
After | Power Operation (100 %) |
Unit 2 | |
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Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Unit 3 | |
---|---|
Reactor critical | Critical |
Scram | No |
Before | Power Operation (100 %) |
After | Power Operation (100 %) |
Oconee ![]() | |
WEEKMONTHYEARENS 469552011-06-07T15:52:0007 June 2011 15:52:00
[Table view]10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Nonconservative Valve Actuator Program Software ENS 465542011-01-06T22:02:0006 January 2011 22:02:00 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Foreign Material Found in Spare Heat Exchanger ENS 463752010-10-28T16:40:00028 October 2010 16:40:00 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Defect Discovered in Tube Steel That Could Be Used in Various Safety Related Structual Applications ENS 443122008-06-16T18:13:00016 June 2008 18:13:00 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Replacement Breaker Charging Motors Failed Minimum Voltage Test ENS 428932003-01-02T04:00:0002 January 2003 04:00:00 10 CFR 21.21, Notification of failure to comply or existence of a defect and its evaluation Part 21 Notification - Voids in Plate Steel 2011-06-07T15:52:00 | |
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