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Category:Accident Sequence Precursor (ASP) Analysis
MONTHYEARML20168A5762020-06-16016 June 2020 Final ASP Analysis - Millstone 2 (LER 336-77-020) ML20168A5752020-06-16016 June 2020 Final ASP Analysis - Millstone 2 (LER 336-76-049) ML20168A5722020-06-16016 June 2020 Final ASP Analysis - Millstone 1 (LER 245-76-029) ML20168A5712020-06-16016 June 2020 Final ASP Analysis - Millstone 1 (LER 245-76-012) ML20168A5702020-06-16016 June 2020 Final ASP Analysis - Millstone 1 (LER 245-76-010) ML20168A5692020-06-16016 June 2020 Final ASP Analysis - Millstone 1 (LER 245-71-099) ML20149K4702020-05-28028 May 2020 Final ASP Analysis - Millstone 2 (LER 336-84-012) ML20149K4692020-05-28028 May 2020 Final ASP Analysis - Millstone 2 (LER 336-81-005) ML20149K4682020-05-28028 May 2020 Final ASP Analysis - Millstone 1 (LER 245-85-018) ML20135G9792020-05-14014 May 2020 Final ASP Analysis - Millstone 3 (LER 423-90-011) ML20135G9802020-05-14014 May 2020 Final ASP Analysis - Millstone 3 (LER 423-91-011) ML20135G9782020-05-14014 May 2020 Final ASP Analysis - Millstone 2 (LER 336-95-002) ML20135G9772020-05-14014 May 2020 Final ASP Analysis - Millstone 2 (LER 336-91-009) ML20113E9362020-05-12012 May 2020 Final ASP Analysis - Millstone 2 (LER 336-01-005) 2020-06-16
[Table view] Category:Final
MONTHYEARML20168A5762020-06-16016 June 2020 Final ASP Analysis - Millstone 2 (LER 336-77-020) ML20168A5752020-06-16016 June 2020 Final ASP Analysis - Millstone 2 (LER 336-76-049) ML20168A5722020-06-16016 June 2020 Final ASP Analysis - Millstone 1 (LER 245-76-029) ML20168A5712020-06-16016 June 2020 Final ASP Analysis - Millstone 1 (LER 245-76-012) ML20168A5702020-06-16016 June 2020 Final ASP Analysis - Millstone 1 (LER 245-76-010) ML20168A5692020-06-16016 June 2020 Final ASP Analysis - Millstone 1 (LER 245-71-099) ML20149K4702020-05-28028 May 2020 Final ASP Analysis - Millstone 2 (LER 336-84-012) ML20149K4692020-05-28028 May 2020 Final ASP Analysis - Millstone 2 (LER 336-81-005) ML20149K4682020-05-28028 May 2020 Final ASP Analysis - Millstone 1 (LER 245-85-018) ML20135G9792020-05-14014 May 2020 Final ASP Analysis - Millstone 3 (LER 423-90-011) ML20135G9802020-05-14014 May 2020 Final ASP Analysis - Millstone 3 (LER 423-91-011) ML20135G9782020-05-14014 May 2020 Final ASP Analysis - Millstone 2 (LER 336-95-002) ML20135G9772020-05-14014 May 2020 Final ASP Analysis - Millstone 2 (LER 336-91-009) ML20113E9362020-05-12012 May 2020 Final ASP Analysis - Millstone 2 (LER 336-01-005) 2020-06-16
[Table view] |
Text
ffsite Power Lost at Millstone 2 e sequence was:
a hurricane, severe salt contamination caused several switchyard es, resulting in a loss of offsite power and a reactor trip from ower.
esel generators, which had been running prior to the trip, provided to safety related loads.
e action; yard equipment and insulators were washed down, damaged circuit ere repaired, and the offsite transmission lines returned to service.
rpose of failed system or component:
e power provides the preferred source of power to safety related the unit generator is not available.
ility of system per WASH 1409:
- off-site power: 2 x lO-5Ihr ility of component per WASHi 1400:*
ailabilities are in units of per demand D-1 . Failure rates are in per hour HR-1 .
and loss of offaite Damage power and conse-quent reactor trip No No - steam driven AFW pump available for RX cooling No No No - steam driven AFW pump available for Rx cooling No 117944 - Actual Occurrence for Offsite Power Lost at Millstone 2
I 2
3 4
5 6
7 8
9 10 11 12 13 IC 117944 - Sequence of Interest for Offsite Power Lost at Millstone 2 e of HPI after AFW failure not included in mitigation procedures.
diesel generators running but not loaded
CATEGORIZATION OF ACCIDENT SEQUENCE PRECURSORS CESSION NULMBER: 117944 LER: September 3, 1976 EVENT: August 10, 1976 NVOLVED: offsite power T INVOLVED: switchyard insulators and equipment severe salt spray wetting during hurricane OF INTEREST: loss of off site power CCURRENCE: reactor trip with loss of offsite power and diesel generators previously started and running NAMtE. M~illstone 2 NUMBER: 50-336 TYPE: PWR ELECTRICAL RATING: 830 MWe AGE: .8 yr Combustion Engineering CT-ENGINEERS: Bechtel RS: Northeast Nuclear Energy Co.
N: 5 miles SW of.New London, Conn.
N: N/A PERATING CONDITION: 100% powet FEATURE TYPE OF FAILURE: (a) inadequate performance; (b) failed to start; r(Omade inoperable; (d)__________
RY MET1EOD: during operation
- -