ML11173A166
| ML11173A166 | |
| Person / Time | |
|---|---|
| Site: | Oconee  |
| Issue date: | 06/13/2011 |
| From: | Severance S Duke Energy Carolinas |
| To: | Office of Nuclear Reactor Regulation |
| References | |
| 46955 | |
| Download: ML11173A166 (3) | |
Text
0611312011 U.S. Nuclear Regulatory Commission Operations Center Event Report Paee I Power Reactor Event#
46955 Site: OCONEE Notification Date / Time: 06/13/2011 16:04 (EDT)
Unit: 1 2
3 Region: 2 State : SC Event Date / Time: 06/07/2011 11:52 (EDT)
Reactor Type: [1] B&W-L-LP,[2] B&W-L-LP,[3] B&W-L-LP Last Modification: 06/13/2011 Containment Type: DRY AMB DRY AMB DRY AMB NRC Notified by: SANDRA SEVERANCE Notifications: MIKE ERNSTES R2DO HQ Ops Officer: MARK ABRAMOVITZ PART 21 GROUP Emergency Class: NON EMERGENCY 10 CFR Section:
21.21 UNSPECIFIED PARAGRAPH Unit Scram Code RX Crit Init Power Initial RX Mode Curr Power Current RX Mode 1
N No 0
Refueling 1100 Power Operation 2
N Yes 100 Power Operation 100 Power Operation 3
N Yes 100 Power Operation 100 Power Operation NONCONSERVATIVE VALVE ACTUATOR PROGRAM SOFTWARE "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.
nO
061,13/11 16:02 FAX 2869 UNIT 1 & 2 CONTROL ROOM 4 NRC 2 001 Attachment B NRC Event Notification Worksheet OMP 1-14 Page 1 of 2 NRC Event Notification Worksheet Notification Time Facility or Organization Unit Caller's Name Call Back #
Oconee Nuclear Station 1, 2, 3 Sandra Severance ENS 256-9931 (864) 873-3466 NRC Operations Officer Contacted:
I NRC Event Number:
Event Time/Zone Event Date Power/Mode Before Power/Mode After 1152EST 6/7/2011 Unitl: Mode6 Unit 1: 100%
Unit2: 100%
Unit2: 100%
Unitl3 100%
Unit 3: 100%
I Event Classifications LI LI General Emergency Site Area Emergency Alert
[] Unusual Event Q 50.72 Non-emergency (see other columns)
EL 73.71 Physical Security El Transportation E] 202202 Material/Exposure F] 26.73 Fimess for Duty
[
Other: 21-21 (d)(3)(i) 1 -Hour Non-emergency 10 CFR 50.72 (b)(1)
Il Deviation from TS per 50.54(x) 4-Hour Non-Emergency 10 CFR 50.7; (b)(2)
LI (i) TS Required Shutdown L] (iv) (A) ECCS Discharge into RCS U (iv) (B) RPS Actuation (while critical)
L] (xi) News release/notification to other government agencies 8-Hour Non-Emergency 10 CFR 50.72 (b) (3)
L] (ii) (A) Degraded Condition EL (ii) (B) Unanalyzed Condition LI (xiii) Loss of emergency assessment capability/offsite communications L] (iv) (A) System Actuation L] RPS
[] Containment isolation L] EccS EFW LI Containment spray/coolers EL Emergency AC (Keowee Hydro)
E] (v) (A) Safe Shutdown Capability
[I (v) (B) Residual Heat Removal Capability L] (v) (C) Control of-radiological material E] (v) (D) Accident Mitigation L] (xii) Transport contaminated person to offsite medical facility
06/13/11 16:02 FAX 2869 UNIT I & 2 CONTROL ROOM 4 NRC 002 Attachment B NRC Event Notification Worksheet OMP 1-14 Page 2 of 2
. Event Description (Include systems affected, actuations and their initialing signals causes, cffect of event on plat, actions taken or planned, etc.)
Event: In KVAP Error Report 2011-02, Kalsi Engineering identified an error in the Kalsi Engineering Valve and Actuator Program (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 I OCFR2 1.
Initial Safety Significance: 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.
Corrective Action(s):
- 1. Upon further calculation, two of the containment isolation valves were determined to have adequate margin and were declared operable.
- 2. Two other containment isolation valves required modifications to restore operability.
Anything unusual or not understood?
E Yes (Explain above)
]
No Did all systems finction as required?
[] Yes E] No (Explain above)
Mode of operations until corrected:
Estimated restart date; Does event result in a radiological release, RCS leak, or steam generator tube L Yes (complete page 3)
No leak?I (cmltpaeSj N
Does the event result in any of the units experiencing a LI Yes (complete Oconee Plant Status sheet) I No transient?
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