05000237/LER-1981-043-03, /03L-0:on 810702,relay 590-123B Did Not Drop Out When Turbine First Stage Pressure Exceeded 45% of Normal During Routine Load Increase.Caused by Defective Pressure Switch.Pressure Switch Defective Wiring Removed & Replaced

/03L-0:on 810702,relay 590-123B Did Not Drop Out When Turbine First Stage Pressure Exceeded 45% of Normal During Routine Load Increase.Caused by Defective Pressure Switch.Pressure Switch Defective Wiring Removed & Replaced

ML20010A644
Person / Time
Site:	Dresden
Issue date:	07/28/1981
From:	Morgan W COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20010A639	List: 05000237/LER-1981-043, Forwards LER 81-043/03L-0 05000237/LER-1981-043-03, /03L-0:on 810702,relay 590-123B Did Not Drop Out When Turbine First Stage Pressure Exceeded 45% of Normal During Routine Load Increase.Caused by Defective Pressure Switch.Pressure Switch Defective Wiring Removed & Replaced
References
LER-81-043-03L, LER-81-43-3L, NUDOCS 8108110630
Download: ML20010A644 (2)

LER-1981-043, /03L-0:on 810702,relay 590-123B Did Not Drop Out When Turbine First Stage Pressure Exceeded 45% of Normal During Routine Load Increase.Caused by Defective Pressure Switch.Pressure Switch Defective Wiring Removed & Replaced

Event date:
Report date:
2371981043R03 - NRC Website

text

NRC FORM 386 ILS. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l l

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ol2l l During routine

• load increase on Dresden Unit.2, Relay 590-123B did not drop out when l-

,g,3, l turbine first stage pressure exceeded 45 percent of normal. The saf y implications

,,,,,, were minimal because the 3 remaining switches were all operable and would have per-g.

,g,,,, formed the necessary trip at 400 PSIG. There was no effect on public health or safety.;

,, g,, First occurrence at Dresden.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h l l i l o l l Relay 590-123B would not drop Out because of a defective pressure switch (PS 504B).

I li#ii i Cause attributed to a micro switch part of the pressure switch.

Since the pressure I i 12 I l switch is equipped with two mict-switches, wiring was removed from the defective l

l,;3g l switch and installed on the spare. Pressure switch was calibrated via DIS 500-7 and l

i, 34, l returned to service. Defective micro switch was subsequently replaced.

7 8 9 80 A

% POWER OTHER STATUS ISC EY OtSCOVERY DESCRIPTION l l1 l5 I bh l 0 l 5 l1 l@l NA l

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DEVIATION REPORT DV R NO.

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Commonwealth Ed.ison STA UNIT YEAR NO.

8-12 81 - 73 PART Il TI TLE OF DEVl ATION OCCU UED 7/2/81 2050 Generator Load Reject and Stop Valve Closure Scram Bypassed Above 45% Power DATE TIME SYSTEM AFFECTED 500

PLANT CONDITIONS

TESTING RPS C3 E"3 Run 1304 MODE pwpguw73

, LOAD (MWE)

YES NO DESCRIPilON OF EVENT Relay 590-123B did not drop out when turbine first stage pressure was greater than 45%. Alarm (902-5) H-4 would not reset.

DESCRIPTION OF CAUSE Unknown at this tine.

WTHER APPLICABLE INFORMATION Fuse 590-7263 was pulled and the 590-123B relay dropped out.

Alarm H-4 then reset.

IM's called in to investigate.

EQUIPMENT YES DR NO.

WR NO.

J. Achterberg 7/2/81 FAILU RE Q NO N/A D14518 RESPONSIBLE SUPERVISOR DATE PART 2 l OPERATING ENGINEERS COMMENTS Pressure switch 504B recalibrated and returned to service.

SAFETY-TYPE OF CEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE OCCURRENCE PUBLIC INTEREST VIOLATION OCCURRENCE REPORTI NG WR ISSUED 10CFR21 14 DAY YES X YES x 30 CAY TlFlCATION NO NO l

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REPORTAPLE CCCURRENCE ACTION ITEM NO.

PROMPT ON-5I TE NOTI FICATION NWBER C. E. Sargent 7/7/81 1700 iTL DATE TIME XXRX 81-43/03L-0 T I TLE DATE TIME 24-HOUR NRC NOTIFICATION PRCMPT OFF-SITE NOTIFICATION TPH N/A F. A. Palmer 7/8/81 0908 REGION III CATE TIME TI TL E DATE TIME TGM N/A REGION lli & COL CATE TIME TITLE DATE TIME RESPONSI BLE COMP ANY OFFI CER I N FO RMED O F 10CFR21 c0N0fTIONS AND TWEIA DEPO AT TO N PC TITLE DATE TiML

" 8" REV1 EW AND COMPLETED OPERATING ENGINEin DATE CEP BY STATION REVIEW 3

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RESOLUTION APPROVEC AND Ml e

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AUTHORI ZED FOR CI STRI BUTION STATION (LjERINgDENT OfTE i

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