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Category:Accident Sequence Precursor (ASP) Analysis
MONTHYEARML20168A5812020-06-16016 June 2020
Final ASP Analysis - Oconee 2 (LER 270-79-007)
ML20168A5802020-06-16016 June 2020
Final ASP Analysis - Oconee 1 and 2 (LER 269-79-LTR)
ML20168A5822020-06-16016 June 2020
Final ASP Analysis - Oconee 3 (LER 287-75-007)
ML20149K4842020-05-28028 May 2020
Final ASP Analysis - Oconee 1 (LER 269-85-002)
ML20149K4852020-05-28028 May 2020
Final ASP Analysis - Oconee 1 (LER 269-85-005)
ML20149K4912020-05-28028 May 2020
Final ASP Analysis - Oconee 3 (LER 287-87-006)
ML20149K4862020-05-28028 May 2020
Final ASP Analysis - Oconee 1 (LER 269-85-007)
ML20149K4872020-05-28028 May 2020
Final ASP Analysis - Oconee 1 (LER 269-86-001)
ML20149K4882020-05-28028 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-86-011)
ML20149K4892020-05-28028 May 2020
Final ASP Analysis - Oconee 3 (LER 287-83-011)
ML20149K4902020-05-28028 May 2020
Final ASP Analysis - Oconee 3 (LER 287-85-002)
ML20135H2922020-05-14014 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-91-010)
ML20135G9832020-05-14014 May 2020
Final ASP Analysis - Oconee 1 (LER 269-92-004)
ML20135H2932020-05-14014 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-92-008)
ML20135H2952020-05-14014 May 2020
Final ASP Analysis - Oconee 2 (LER 270-92-004)
ML20135H2942020-05-14014 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-92-018)
ML20135H2962020-05-14014 May 2020
Final ASP Analysis - Oconee 2 (LER 270-97-001)
ML20135H2972020-05-14014 May 2020
Final ASP Analysis - Oconee 3 (LER 287-91-007)
IR 05000269/20000042020-05-12012 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (IR 050002692000004)
ML20114E0652020-05-12012 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-99-001)
ML20114E0632020-05-12012 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-98-004)
IR 05000287/20020152020-05-12012 May 2020
Final ASP Analysis - Oconee 3 (IR 050002872002015)
IR 05000269/20000082020-05-12012 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (IR 050002692000008)
ML18037B0432017-12-12012 December 2017
Final Accident Sequence Precursor Analysis Oconee Nuclear Station, Loss of Both Keowee Hydroelectric Units Due to Human Error(Ler 296-2017-001)- Reject)
ML18033A6192017-12-0707 December 2017
Final Accident Sequence Precursor Analysis - Oconee Nuclear Station, Loss of Both Keowee Hydroelectric Units Due to Human Error (LER 269-2017-001) - Reject
2020-06-16
[Table view]
Category:Final
MONTHYEARML20168A5812020-06-16016 June 2020
Final ASP Analysis - Oconee 2 (LER 270-79-007)
ML20168A5802020-06-16016 June 2020
Final ASP Analysis - Oconee 1 and 2 (LER 269-79-LTR)
ML20168A5822020-06-16016 June 2020
Final ASP Analysis - Oconee 3 (LER 287-75-007)
ML20149K4842020-05-28028 May 2020
Final ASP Analysis - Oconee 1 (LER 269-85-002)
ML20149K4852020-05-28028 May 2020
Final ASP Analysis - Oconee 1 (LER 269-85-005)
ML20149K4912020-05-28028 May 2020
Final ASP Analysis - Oconee 3 (LER 287-87-006)
ML20149K4862020-05-28028 May 2020
Final ASP Analysis - Oconee 1 (LER 269-85-007)
ML20149K4872020-05-28028 May 2020
Final ASP Analysis - Oconee 1 (LER 269-86-001)
ML20149K4882020-05-28028 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-86-011)
ML20149K4892020-05-28028 May 2020
Final ASP Analysis - Oconee 3 (LER 287-83-011)
ML20149K4902020-05-28028 May 2020
Final ASP Analysis - Oconee 3 (LER 287-85-002)
ML20135H2922020-05-14014 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-91-010)
ML20135G9832020-05-14014 May 2020
Final ASP Analysis - Oconee 1 (LER 269-92-004)
ML20135H2932020-05-14014 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-92-008)
ML20135H2952020-05-14014 May 2020
Final ASP Analysis - Oconee 2 (LER 270-92-004)
ML20135H2942020-05-14014 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-92-018)
ML20135H2962020-05-14014 May 2020
Final ASP Analysis - Oconee 2 (LER 270-97-001)
ML20135H2972020-05-14014 May 2020
Final ASP Analysis - Oconee 3 (LER 287-91-007)
IR 05000269/20000042020-05-12012 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (IR 050002692000004)
ML20114E0652020-05-12012 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-99-001)
ML20114E0632020-05-12012 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (LER 269-98-004)
IR 05000287/20020152020-05-12012 May 2020
Final ASP Analysis - Oconee 3 (IR 050002872002015)
IR 05000269/20000082020-05-12012 May 2020
Final ASP Analysis - Oconee 1, 2, and 3 (IR 050002692000008)
ML18037B0432017-12-12012 December 2017
Final Accident Sequence Precursor Analysis Oconee Nuclear Station, Loss of Both Keowee Hydroelectric Units Due to Human Error(Ler 296-2017-001)- Reject)
ML18033A6192017-12-0707 December 2017
Final Accident Sequence Precursor Analysis - Oconee Nuclear Station, Loss of Both Keowee Hydroelectric Units Due to Human Error (LER 269-2017-001) - Reject
2020-06-16
[Table view] |
Text
e 27, 1975 cessive Reactor Coolant Cooldown Rate at Oconee 3 sequence was:
a power reduction, an operator initiated a secondary side transient, which a primary side pressure/temperature transient and opened the pilot d pressurizer relief valve.
ief valve failed to close (due to boric acid crystal buildup) and did icate open in the control room.
trip and high pressure injection occurred.
rator closed the PORV block valve, re-opened it because of increasing izer level, and finally closets it when RC pressure reached 800 psig, ting the transient.
ief valve quench tank rupture disk blew out, damagi~ig some pressurizer tion action; res revised to prevent the initiation of a secondary side transient.
t 1 and unit 2 PORVs.were to, be examined for boric acid crystal buildup.
V will be test cycled prior to each startup.
ng personnel were advised that closure of the block valve was the cor-action for this occurrence.
ose of failed system or component:
ve provides pressure relief protection for the RCS.
ity of system per WASH 1400: *N/A ity of component: PORV failure to close:10-2 /D ilabilities are in units of per demand D-1 . Failure rates are in er hour HR-1.
Damage No No No No Yes No 2 -Actual Occurrence I or Excessive -Cooldown Rate at Oconee 3
Secondary Injection and LPR/HPI Core Heat Removal Cros s-Connect Damage 2
3 4
5 6
7 NSIC 103892 - Sequence of Interest for Excessive Cooldown Rate at Oconee 3
- failure requires operator error in failing to close the PORV isolation valve.
N NUMBER: 103892 June 27, 1975
- June 13, 1975 D: RCS OLVED: Pilot operated relief valve stuck open, operator error NTEREST; LOCA - small break from stuck open PORV ENCE: Stuck open PORV Oconee 3 50-287 PWR CAL RATING: 887 MWe 2.5 yr ock & Wilcox INEERS: Duke Power Co.
Duke Power Co.
0.mtlje west of Greenville, SC NG CONDITION: at 100% power E TYPE OF FAILURE: (a) inadequate performance; (b) failed to start; (c) made inoperable; 0-failed open HOD: Transient while operating
