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Category:Accident Sequence Precursor (ASP) Analysis
MONTHYEARML21071A1052021-03-18018 March 2021
Transmittal of Final North Anna Power Station, Unit 1 - Accident Sequence Precursor Report (Licensee Event Report 338-20-001)
ML21071A1062021-03-0202 March 2021
Final ASP Analysis - North Anna 1 Degraded Upper Piston Pin Bushing (LER 338-20-001)(Enclosure)
ML20149K4822020-05-28028 May 2020
Final ASP Analysis - North Anna 2 (LER 339-84-013)
ML20149K4812020-05-28028 May 2020
Final ASP Analysis - North Anna 2 (LER 339-82-061)
ML20149K4792020-05-28028 May 2020
Final ASP Analysis - North Anna 2 (LER 339-81-076)
ML20149K4762020-05-28028 May 2020
Final ASP Analysis - North Anna 1 (LER 338-87-017)
ML20149K4742020-05-28028 May 2020
Final ASP Analysis - North Anna 1 (LER 338-82-021)
ML20149K4832020-05-28028 May 2020
Final ASP Analysis - North Anna 2 (LER 339-88-004)
ML20149K4802020-05-28028 May 2020
Final ASP Analysis - North Anna 2 (LER 339-82-009)
ML20149K4782020-05-28028 May 2020
Final ASP Analysis - North Anna 1 (LER 338-89-005)
ML20149K4772020-05-28028 May 2020
Final ASP Analysis - North Anna 1 (LER 338-88-002)
ML20149K4752020-05-28028 May 2020
Final ASP Analysis - North Anna 1 (LER 338-84-019)
ML20135G9822020-05-14014 May 2020
Final ASP Analysis - North Anna 2 (LER 339-93-002)
2021-03-02
[Table view]
Category:Final
MONTHYEARML21071A1052021-03-18018 March 2021
Transmittal of Final North Anna Power Station, Unit 1 - Accident Sequence Precursor Report (Licensee Event Report 338-20-001)
ML21071A1062021-03-0202 March 2021
Final ASP Analysis - North Anna 1 Degraded Upper Piston Pin Bushing (LER 338-20-001)(Enclosure)
ML20149K4822020-05-28028 May 2020
Final ASP Analysis - North Anna 2 (LER 339-84-013)
ML20149K4812020-05-28028 May 2020
Final ASP Analysis - North Anna 2 (LER 339-82-061)
ML20149K4792020-05-28028 May 2020
Final ASP Analysis - North Anna 2 (LER 339-81-076)
ML20149K4762020-05-28028 May 2020
Final ASP Analysis - North Anna 1 (LER 338-87-017)
ML20149K4742020-05-28028 May 2020
Final ASP Analysis - North Anna 1 (LER 338-82-021)
ML20149K4832020-05-28028 May 2020
Final ASP Analysis - North Anna 2 (LER 339-88-004)
ML20149K4802020-05-28028 May 2020
Final ASP Analysis - North Anna 2 (LER 339-82-009)
ML20149K4782020-05-28028 May 2020
Final ASP Analysis - North Anna 1 (LER 338-89-005)
ML20149K4772020-05-28028 May 2020
Final ASP Analysis - North Anna 1 (LER 338-88-002)
ML20149K4752020-05-28028 May 2020
Final ASP Analysis - North Anna 1 (LER 338-84-019)
ML20135G9822020-05-14014 May 2020
Final ASP Analysis - North Anna 2 (LER 339-93-002)
2021-03-02
[Table view] |
Text
LER 339/82-061 Event
Description:
Transient with One Low-Pressure Safety Injection Pump Inoperable Date of Event: September 5, 1982 Plant: North Anna 2 Summary On September 5, 1982 during normal operation, the containment sump suction valve of low-pressure safety injection (LPSI) pump 1A failed to open during a periodic surveillance test. The valve hand wheel, which is connected to the valve with a flexible extension from the first level of the safeguards area to the bottom of the valve pit, could not be moved. Investigation revealed that the flexible extension had been wrapped with a power cord by maintenance personnel, which prevented the extension's rotation. A plant trip occurred on August 22, 1982, 14 days prior to the discovery of the valve fault (NUREG-0020).
This event was modeled as a transient with one LPSI pump residual heat removal (RHR train) assumed to be failed. Since high-pressure recirculation (HPR) relies on these pumps as well, one train of HPR was also set to failed. The estimated conditional core damage probability for this event is 1.1x10-6. The dominant sequence was not affected by the branch probability modifications. The dominant sequence involved the failure of auxiliary feedwater, main feed water, and feed and bleed.
