05000325/LER-1981-017-03, /03L-0:on 810130,reactor Core Isolation Cooling Turbine Tripped Due to High Steam Exhaust Pressure Upon Auto Initiation Signal Following Reactor Scram.Caused by Fine Debris Blockage in Drain Pot Steam Trap

/03L-0:on 810130,reactor Core Isolation Cooling Turbine Tripped Due to High Steam Exhaust Pressure Upon Auto Initiation Signal Following Reactor Scram.Caused by Fine Debris Blockage in Drain Pot Steam Trap

ML19341D433
Person / Time
Site:	Brunswick
Issue date:	02/27/1981
From:	Pastva M CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19341D425	List: 05000325/LER-1981-017, Forwards LER 81-017/03L-0 05000325/LER-1981-017-03, /03L-0:on 810130,reactor Core Isolation Cooling Turbine Tripped Due to High Steam Exhaust Pressure Upon Auto Initiation Signal Following Reactor Scram.Caused by Fine Debris Blockage in Drain Pot Steam Trap
References
LER-81-017-03L, LER-81-17-3L, NUDOCS 8103050594
Download: ML19341D433 (1)

LER-1981-017, /03L-0:on 810130,reactor Core Isolation Cooling Turbine Tripped Due to High Steam Exhaust Pressure Upon Auto Initiation Signal Following Reactor Scram.Caused by Fine Debris Blockage in Drain Pot Steam Trap

Event date:
Report date:
3251981017R03 - NRC Website

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60 68 DOCKET NUMBER 64 63 EVENT 0 ATE 14 73 REPORT OATE 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h o 2 l Upon an auto initiation signal following a reactor scram, the RCIC turbine 1

o 3 l accelerated to designed operating speed, but tripped due to turbine hich steam I

o 4 l exhaust pressure. The HPCI system, which had simultaneouciv initiated. restored I

o s I reactor vessel level to the normal operatinn band. This event did not affect the l

ITTl l health or safety of the public.

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33 33 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS [T}T] l Fine debris blockage in the bell orifice of the RCIC turbine exhaust drain pot sceRm I l trap, Armstrong Machine Works model no. SM-102, prevented turbine steam exhaust I

i i g l condensate from draining. Th'e blockage was removed and the RCIC system was operated I g l satisfactorily. A maintenance instruction is being written to clean the RCIC turbine I l exhaust drain pot steam traps on both units every 6 months.

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NAME OF PREPARER M. J. PASTVA. JR-PHONE:

419-657-4971