05000237/LER-1979-002, Forwards LER 79-002/01X-1

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Forwards LER 79-002/01X-1
ML17173A921
Person / Time
Site: Dresden Constellation icon.png
Issue date: 06/05/1979
From: Stephenson B
COMMONWEALTH EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A922 List:
References
NUDOCS 7906200404
Download: ML17173A921 (3)
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LER-1979-002, Forwards LER 79-002/01X-1
Event date:
Report date:
2371979002R00 - NRC Website
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text

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I-a Commonweal-dison.

Dresden Nuclear PTer Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS LTR t/79-449 June 5, 1979 James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Connnission 799 Roosevelt Road Glen Ellyn, IL 60137 Revised Reportable Occurrence Report 1179-02/0lX-l, Docket t/050-237 is hereby submitted to your office in accor:dance with Dresden.Nuclear Power, Station Technical Specification 6.6.B.l(e), failure or malfunction of one or more components which prevents or could preve~t, by itself, the. fulfi:J._lment of. the functional requirements of. system(s) used to cope.

with accidents analyzed in the SAR *., Futµre action code 19 has been changed to reflect action to be taken as a result of new information.

BBS:lcg Enclosure

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F B.B. Stephenson.*

  • station Superintendent Dresden Nuclear Power Station cc:, Director of Inspection & Enforcement Director of Management Information & Program Control File/NRC

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..a.!CE£\\lSEE EVENT REPOl~T UPDATE REPORT I

9vrous REPORT DATE:

1-17-79 CONTROL ElLOCI(: L I l_=J f,\\

(PLEASE PRINT OR TYPE ALL. REQUIRED INFORMATION)

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60 61 DOCKET !<UMBER GS 69 EVENT DATE 74 75 REPORT DATE BO EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

[)))) I During normal operation, HPCI turbine failed to start during quarterly f] ow_ test. HPCI I declared inoperable and required ECCS surveillances (T. S. 3. 5. C. 2) commenced.

During

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L later testing, HPCI operated successfully six consecutive.times.

HPCI then declared

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Required $urveillances except auto blowdoWQ. were completed satisfactorily.

This is the first occurrence of this type.

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[iJTI ~pe~:~_in?._~ever.. Lever adjusted.

HPCI started to verify operability.

During re-I fueling outage 4/79 found control oil restriction in motor speed changer pilot valve. I [JJ}] I prevented full electric positioner piston travel.

Relieved restriction.

Will insp~ctJ

[ 1 [j] I Unit 3 HPCI controls.

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ATTACHMENT TO LICENSEE EVENT REPORT 79-02/0lX-l COMHONWEALTH EDISON COMPANY (CWE)

DRESDEN UNIT (ILDRS-2)

DOCKET II 050-237 With the unit operating at steady load, the HPCI turbine failed to start during performance of quarterly 'flow test surveillance DOS 2300-3.

~*lhen the motor speed changer was run from the low speed stop to the high speed stop, the turbine control valves did not open~

As a result the HPCI system was declared inoperable and the required ECCS surveillances (T.S. 3.5.C.2) commenced.

At 1430 the HPCI surveillance was performed again and the HPCI turbine started on the second attempt... Six con*secutive turbine startups were performed and the surveillance successfully completed.

l'he HPCI system was declared operable.

This event has minimal safety significance since the required ECCS surveillances with the exception of auto blo.\\-ldown 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 Technical representative present.

He noted that the pin 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.

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.

During the Unit 2 refueling outage on 4/79, the General Electric Technical representative made an inspection of the HPCI turbine control system.

This included checking linkage measurements and piston travel during control system operation.

He found that the electric positioner piston did not fully re-tract to the required position when the motor speed changer is run to the low speed stop.

The pin discussed above is connected to the electric po-sitioner piston rod.

This accounts for the adjustment required previously to effect proper interlock dump valve operation.

Further investigation revealed that an oil restriction existed in the motor speed changer pilot valve resulting in incomplete venting of the.control _QiLfrom~_the.electric positioner piston.

When the restriction problem was rectified, the control system was verified to operate properly.

It is planned to perform a similar control system inspection on the Unit 3 HPCI turbine during the next Unit 3 refueling outage.

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