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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 338/82-021 Event
Description:
Transient with One AFW Pump Inoperable Date of Event: April 16, 1982 Plant: North Anna 1 Summary On April 16, 1982 following a manual reactor trip due to a loss of the circulating water pumps (NUREG- 0020), auxiliary feedwater (AFW) pump 3B was inoperable for a period of 78 minutes.
The control switch slipped when an attempt was made to place the switch in the pull-to-lock position. The pump momentarily re-energized while it was slowing down, which resulted in an overcurrent trip. AFW pump 3A was immediately lined up to supply steam generator B. The pump motor was bridged, meggered, and verified operable.
This event was modeled . as transient with one AFW pump inoperable. The estimated conditional core damage probability is 1.8x10-6. The dominant sequence involved the failure of AFW, the failure of main feedwater, and the failure of feed and bleed.
