ML20168A445

Final ASP Analysis - Calvert Cliffs 1 (LER 317-78-020)

ML20168A445
Person / Time
Site:	Calvert Cliffs
Issue date:	06/16/2020
From:	Christopher Hunter NRC/RES/DRA/PRB
To:
Littlejohn J (301) 415-0428
References
LER 1978-020-00
Download: ML20168A445 (4)

Text

el Generator Fails to Start Following a Loss of All Offeite Power at ert Cliffs 1 equence was:

plant shutdown, switchyard breaker protective relaying automatically he switchyard breakers, resulting in a loss of offsite power.

enerator 11 failed to start.

enerator 12 started and provided power to safety-related loads.

tion:

the cause of the diesel-generator failing to start was not determined.

e of failed system or component:

power provides the preferred source of power to safety-related equipment unit generator is not operating.

el-generators provide a standby source of power to safety related loads ther the unit generator nor offsite power is available.

y of system per WASH 1400:

• off site power: 2 x 10-5 /hr onsite power: 1 X 10 2 /1) y of component per WASH 1400:

• diesel generator: 3 x 10-'/D abilities are in units of per demand D-1 . Failure rates are in hour HR-1

ng Automatically Related Loads Damage Breakers, ing- in a Loss site Power

-No - steam driven auxiliary feedwater system available for reactor cooling at RCS temperatures above n,25OPF.

SIC 137543 - Actual Occurrence for Diesel Generator Fails to Start Following a Loss of All e Power at Calvert Cliffs 1

2 3

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10 11 12 13 137543 - Sequence of Interest for Diesel Generator Fails to Start Following a Loss of All Off site Power t Cliffs 1 t included in mitigation procedures.

CATEGORIZATION OF ACCIDENT SEQUENCE PRECURSORS CESSION NUMBER: 137543 LER: April 14, 1978 EVENT: April 13, 1978 INVOLVED: off site power, onsite power NT INVOLVED: diesel generator failure to start E OF INTEREST: loss of off site power OCCURRENCE: loss of offsite power while shutdown NAME: Calvert Cliffs 1 NUMBER: 50-317 TYPE: PWR ELECTRICAL RATING: 845 MWe AGE: 3.5 yr Combustion Engineering T-ENGINEERS: Bechtel S: Baltimore Gas & Electric Co.

40 miles south of Annapolis, Nd.

N/A PERATING CONDITION: shutdown FEATURE TYPE OF FAILURE: (a) inadequate perfornance;(afailed to start; (c) made inoperable; (d) ___________

Y METHOD: during operation

-