ML19256B185

LER 79-002/01T-0 on 790103:HPCI Turbine Failed to Start During Quarterly Flow Test.Caused by Misadjustment of the Interlock Dump Valve Operating Lever

ML19256B185
Person / Time
Site:	Dresden
Issue date:	01/17/1979
From:	Parcell COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A523	List: ML17173A521 ML19256B185
References
LER-79-002-01T, LER-79-2-1T, NUDOCS 7901240213
Download: ML19256B185 (2)

Text

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Gd 03 EVENT DATE 74 75 PEPCHT DATE SJ EVENT DESCRIPTION AND PROBAGLE CONSEQUENCES h a l2 (_Eurinn normal Operation, llPCI turbine failed to start during quarterly flow test. HPCIl

[o l a j l declared inoperable and required ECCS surveillances (T.S. 3.5.C.2) commenced. Duringl o 4 l_]ater testinn uHPCI operated successfully six consecutive times. HPCI then declared l o s Ioperable. Required surveillances except auto blowdown were completed satisfactorily. ]

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43 lGl0l8l0lg 44 47 CAUSE DESCRIPTION AND CORriECTIVE ACTIONS h f a o l During operation of the llPCI turbine on 1/4/79 the Cencral Electric Technical rep- l 1 -

LL11J l resentative noted a misalustment of the inter]ock dump valve operating lever. The i, i > [ Icver was adjusted and the HPCI pump started to verify proper operation. No l 1

i 3 [ additional action is planned.

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ATTACIDIENT TO LICENSEE EVENT REPORT 79-02/0lT-0 COFC10NWEALTil EDISON COMPANY (CNE)

DRESDEN UNIT-2 (ILDRS-2)

. DOCKET #050-237 i

, With the unit operating at steady load,- the HPCI turbine failed to start i during performance of quarterly flow test surveillance DOS 2300-3. When i the motor speed changer was run from the low speed step to the high speed stop, the turbine control valves did not open. As a result the HPCI system I was declared inoperabic and the required ECCS surveillances (T.S. 3.5.C.2) com-

. menced. At 1430 the HPCI surveillance was performed again and the HPCI turbine

started on the second attempt. Six consecutive turbine startups vere per-formed and the surveillance successfully completed. The HPCI system was declared operable. This event has minimal safety significance since the required ECCS surveillances with the exception of auto blowdown were completed.

The auto blowdown surveillance was terminated when HPCI was declared operable.

On 1/4/79 at 1100 the HPCI turbine was operated with the General Electric

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Technical representative present. He noted that the pir. on the motor speed changer linkage which actuates the interlock dump valve when the motor speed changer is on the low speed stop was not fully depressing the interlock dump valve operating lever. The purpose of the interlock dump valve is to prevent the control valves from opening during system startup with the turbine reset and the motor speed changer not on the low speed stop.

l The interlock dump valve actuating lever was adjusted to provide full .

engagement and HPCI pump and valve operability surveillance DOS 2300-1 successfully performed at 1400. No further action is planned.

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