ML20168A443

Final ASP Analysis - Brunswick 2 (LER 324-79-050)

ML20168A443
Person / Time
Site:	Brunswick
Issue date:	06/16/2020
From:	Christopher Hunter NRC/RES/DRA/PRB
To:
Littlejohn J (301) 415-0428
References
LER 1979-050-00
Download: ML20168A443 (4)

Text

h RIIR Service Water Pumps Inoperable at Brunswick 2 sequence was:

ctor was operating at 88% power.

rator gave a mechanic clearance to uncouple 2B RHR pump for alignment c uncoupled pump 2A by mistake.

act ion:

hours later the error was discovered and pump 2A was recoupled and nsure operability.

ose of failed system or component:

R provides reactor core cooling and water level control during normal d shutdown periods. The RHR can also be operated in the LPCI mode.

ity of system per WASH 1400:

• 1.1 x 10-4 /D ty of component per WASH 1400:

• 3 x 10-3 /D operator error 1

ilabilities are in units of per demand D- . Failure rates are in r hour HR'*.

No - normal operation &

HPCI in service.

No SIC 150271 - Actual Occurrence of Both RHR Service Water Pumps Inoperable at Brunswick 2

Severe No.

Core Damage No1 Yes 2 No 3 Yes 4 Yes 5 Yes 6 Yes 7 NSIC 150271 - Sequence of Interest of Both RHR Service Water Pumps Inoperable at Brunswick 2 iFor success the operator must rack the pumps backin within 2-24 hours.

CATEGORIZATION OF ACCIDENT SEQUENCE PRECURSORS CESSION NUMBER: 150271 LER: July 12, 1979 EVENT: June 19, 1979 INVOLVED: RHR NT INVOLVED: service water pumps human error E OF INTEREST: loss of feedwater OCCURRENCE: Both RHR service water pumps inoperable at Brunswick 2 NAME: Brunswick 2 NUMBER: 50-324 TYPE: BWR ELECTRICAL RATING: 821 MWe AGE: 4.25 yr GE CT-ENGINEERS: United Engineers and Constructors RS: Carolina Power and Light N: Three miles N of South Port, NC N: 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> PERATING CONDITION: 88% power FEATURE TYPE OF FAILURE: (a) inadequate performance; (b) failed to start; Onade inoperable; (d) ___________

RY METHOD: operator surveillance

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