ML12038A135
| ML12038A135 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs, Surry  |
| Issue date: | 08/29/2011 |
| From: | Kulesa G Office of Nuclear Reactor Regulation |
| To: | Patrick Boyle Office of Nuclear Reactor Regulation |
| References | |
| FOIA/PA-2011-0357 | |
| Download: ML12038A135 (2) | |
Text
Boyle, Patrick
(
From:
Kulesa, Gloria Sent:
Monday, August 29, 2011 9:26 AM To:
Boyle, Patrick P-t O-ut-side
Subject:
R&WRequest for Assistance - Confirmation that OBE was not exceeded a deof fsioe Outside 1 II Sop of Cco e
[f From: Khanna, Meena Sent: Monday, August 29, 2011 8:50 AM To: Kulesa, Gloria
- Outs,
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Subject:
FW: Request for Assistance - Confirmation that OBE was not exceeded a de ond Ouspe of Gloria, just an fyi...this would be good for the PM to use in requesting info o Oulsi 'tan s de of From: Pickett, Dougla's S0, Sent: Monday, August 29, 2011 7:25 AM To: Furio, Patricia S; doug.lauver0cengllc.com Cc: Khanna, Meena; Salgado, Nancy; Dentel, Glenn; Kennedy, Silas
Subject:
FW: Request for Assistance - Confirmation that OBE was not exceeded a de ofnd usope Doug/Pat - As indicated in the 50.72 report, North Anna may have exceeded their design basis earthquake during last Tuesday's seismic event. As a result, the staff is requesting whethe Outside of xceeded their operating or design basis earthquake.
Scope Could you please have your staff look into this and let me know?
Thanks - Doug Douglas V. Pickett, Senior Project Manager Calvert Cliffs, R.E. Ginna U.S. Nuclear Regulatory Commission 301-415-1364 Email: douclas.pickett(dnrc.gov Power Reactor Event Number: 47201 Facility: NORTH ANNA Notification Date: 08/26/2011 Region: 2 State: VA Notification Time: 16:23 [ET]
Unit: [1] [2111 Event Date: 08/26/2011 RX Type: [1) W-3-LP,[2] W-3-LP Event Time: 13:00 [EDT]
NRC Notified By: PAGE KEMP Last Update Date: 08/26/2011 HQ OPS Officer: BILL HUFFMAN Emergency Class: NON EMERGENCY Person (Organization):
10 CFR Section:
}MALCOLM WIDMANN (R2DO)
- 50.72(b)(3)(ii)(B) - UNANALYZED CONDITION SCAM Current Unit Code RX CRIT Initial PWR Initial RX Mode PWR Current RX Mode
' V N _ _
NCld S uto n01 Cold Shutdown information in this record was deleted accordance with the re dom of Info mafn,
,ct, exemptions
2 1
N N
0 Hot Shutdown 01 Hot Shutdown Event Text 1UNANALYZED CONDITION BASED ON SEISMIC ACTIVITY THAT POTENTIALLY EXCEEDED DESIGN BASIS I EARTHQUAKE MAGNITUDE 1On August 23, 2011 at 1351 hours0.0156 days <br />0.375 hours <br />0.00223 weeks <br />5.140555e-4 months <br />, North Anna Power Station experienced a seismic activity event which resulted in a loss of offsite power and automatic reactor trip of both units. At 1403 hours0.0162 days <br />0.39 hours <br />0.00232 weeks <br />5.338415e-4 months <br />, an Alert was declared, based on Shift Manager judgment, due to significant seismic activity on the site. Subsequent to the earthquake, both units were stabilized and offsite power was restored. Following the event, seismic data was retrieved from the installed monitoring system and shipped to the vendor to determine the response spectrum for the event. On August 26, 12011 at 1340 hours0.0155 days <br />0.372 hours <br />0.00222 weeks <br />5.0987e-4 months <br />, initial reviews of the data determined that the seismic activity potentially exceeded the Design iBasis Earthquake magnitude value above 5 Hz. Therefore, this is reportable per 10CFR50.72(b)(3)(ii) (B) for the nuclear power plant being in an unanalyzed condition that significantly degrades plant safety.
North Anna Unit 1 is currently in Cold Shutdown with the Residual Heat Removal System providing core cooling.
'North Anna Unit 2 is currently in Hot Shutdown and will be taken to Cold Shutdown with the Residual Heat Removal System providing core cooling. No significant equipment damage to Safety Related system (including Class 1 Structures) has been identified through site walk-downs nor has equipment degradation been detected through plant performance and surveillance testing following the earthquake. Therefore, there is reasonable assurance that the Safety Related systems are fully functional.
'The Spent Fuel Pit cooling system also remains fully functional and the temperature of the Spent Fuel Pit remained unchanged during the event.
The vendor will complete the analysis of the seismic data and this information will be utilized to address the long
!term actions following the earthquake.
From: Khanna, Meena......................................................
Sent: Sunday, August 28, 2011 12:47 AM To: Cotton, Karen; Pickett, Douglas Cc: Kulesa, Gloria; Salgado, Nancy; Manoly, Kamal; Li, Yong; Wilson, George; Martin Robert* Lund Louise
Subject:
Request for Assistance - Confirmation that OBE was not exceeded a io ncOutside of Karen and Doug, I'd like to request your assistance pis. In light of the recent earthquake/seismic issues at the North Anna NPP, could you pls confirm that the Operating Basis Earthquake (OBE) was not exceeded atli-.
Outside of ack Grobe requested this info and I'd appreciate your support on this.
of Scope PIs see below for info that we received from USGS Shakemap...
The list below provides the plants and the associated distance from the EpiCenter:
K Nnrth Anna is 1R kmfrom the Epicenter Outside of Scope
- Thanks, Meena Khanna, Branch Chief Mechanical and Civil Engineering Branch Division of Engineering Office of Nuclear Reactor Regulation 2