05000324/LER-1980-029-03, /03L:on 800323,following Reactor Scram,Hpci Discharge Valve E41-F006 Would Not Remain Open Following Low Level Initiation Signal.Caused by HPCI Turbine Stop Valve E41-V8 Opening Too Quickly.Spring Loaded Bypass Adjusted

/03L:on 800323,following Reactor Scram,Hpci Discharge Valve E41-F006 Would Not Remain Open Following Low Level Initiation Signal.Caused by HPCI Turbine Stop Valve E41-V8 Opening Too Quickly.Spring Loaded Bypass Adjusted

ML19309F197
Person / Time
Site:	Brunswick
Issue date:	04/21/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19309F189	List: 05000324/LER-1980-029, Forwards LER 80-029/03L-0 05000324/LER-1980-029-03, /03L:on 800323,following Reactor Scram,Hpci Discharge Valve E41-F006 Would Not Remain Open Following Low Level Initiation Signal.Caused by HPCI Turbine Stop Valve E41-V8 Opening Too Quickly.Spring Loaded Bypass Adjusted
References
LER-80-029-03L-01, LER-80-29-3L-1, NUDOCS 8004280599
Download: ML19309F197 (2)

LER-1980-029, /03L:on 800323,following Reactor Scram,Hpci Discharge Valve E41-F006 Would Not Remain Open Following Low Level Initiation Signal.Caused by HPCI Turbine Stop Valve E41-V8 Opening Too Quickly.Spring Loaded Bypass Adjusted

Event date:
Report date:
3241980029R03 - NRC Website

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8 60 61 DOCKET Nuv9ER h4 63 EVENT DATE 74 7b REPORT DATE 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h l Following a reactgr scram, the HPCI disenarge valve E41-F006 would not remain open l

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J4 3b 36 31 40 41 42 43 44 47 33 CAUSE OESCRIPTION.tND CORRECTIVE ACTIONS h l11oll The HPCI turbine stop valve E41-V8 was found'to be openine too cuickiv. 6 seco n l

vice 12, thus not allowing the flow controller to gain speed control before an l

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O LER ATTACHMENT - RO NO. 1-80-29 Facility: BSEP Unit No. 1 Event Date: March 23, 1980 The HPCI discharge valve E41-F006 is interlocked with the steam supply valve E41-F001 and the turbine stop valve E41-V8 such that if either of these valves is not fully open, the -F006 valve will shut. When -V8 reached the full open position, -F006 would start to stroke open.

Due to the fast opening of -V8, the HPCI turbine would trip on overspeed, -V8 would shut, and -F006 would shut.

When the turbine slowed down to the overspeed reset speed, -V8 would again open and -F006 likewise. This would continue for several cycles until the speed con-trol unit could finally control the speed. -

Opening time determination will be added to the HPCI response time periodic test which is performed each refueling outage. The concerns of IE Circular 80-07 are also being reviewed with respect to the HPCI stop valves.

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