05000366/LER-1981-044-03, /03L-0:on 810504,HPCI Min Flow Valve Would Not Operate After Being Closed W/Control Switch During Operability Test.Caused by Pressure Switch HPCI Pump Discharge Failing W/Valve Closing.Bourdon Tube Replaced

/03L-0:on 810504,HPCI Min Flow Valve Would Not Operate After Being Closed W/Control Switch During Operability Test.Caused by Pressure Switch HPCI Pump Discharge Failing W/Valve Closing.Bourdon Tube Replaced

ML20004B652
Person / Time
Site:	Hatch
Issue date:	05/21/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004B650	List: 05000366/LER-1981-044, Forwards LER 81-044/03L-0 05000366/LER-1981-044-03, /03L-0:on 810504,HPCI Min Flow Valve Would Not Operate After Being Closed W/Control Switch During Operability Test.Caused by Pressure Switch HPCI Pump Discharge Failing W/Valve Closing.Bourdon Tube Replaced
References
LER-81-044-03L, LER-81-44-3L, NUDOCS 8105290226
Download: ML20004B652 (2)

LER-1981-044, /03L-0:on 810504,HPCI Min Flow Valve Would Not Operate After Being Closed W/Control Switch During Operability Test.Caused by Pressure Switch HPCI Pump Discharge Failing W/Valve Closing.Bourdon Tube Replaced

Event date:
Report date:
3661981044R03 - NRC Website

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60 61 DOCK ET NUMBER est 63 EVENT DATE 74 in REPORT DATE 80 EVENT oESCRIPTioN AND PROB ABLE CoNSEouENCES h 8 IWith Hatch 2 at steady state 100% cower the HPCI valve operability test I

O a Nas being performed.

The HPCI min. flow valve would not operate af ter i

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As per Tech Specs 3.5.1 RCIC, ADS, CS, and LPCI were l

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CAUSE oESCRIPTioN AND CORRECTIVE ACTIONS h 8 IThe event was due to a pressure nf. itch "HPCI Pump Discharge" failing as 1

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The switch failed due to an obstructed bourdon I

i 2 Itube and was replaced.

The valve operated properly and HPCI was declared i a loperable.

The unit is now in full compliance with the requirements, andl E Ino further reporting is required.

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LER f:

50-366/1981-044 Licensec:

Georgia Power Company Facility Name:

Edwin I. Ilatch Docket #:

50-366

Narrative

Report for LER 50-366/1981-044 On 5-4-81, at 11:15, and osth Unit 2 at steady state 100%

thermal power, the monthly test, procedure 11NP-2-330 2 "IIPCI VALVE OPERABILITY", was being performed.

As per the procedure the llPCI minimum flow valve 2E41-F012 was closed using the valve control switch.

Just before the valve fully closed (the close direction torque switch-still activated) the

" pump discharge pressure signal to minimum flow bypass" pressure switch (2E41-N027) failed due to an obstruction of the bourdon tube and a "high discharge pressure" signal resulted causing an open signal to be sent to the 2E41-F012 valve.

Since the valve received a close signal and an open signal simultaneous-ly the valve av.or forward and reverse interlock opened, and the motor was isolated from the resulting electrical race cf the open and close logic.

The HPCI system was declared inop-erabic, and per Tech Specs section 3.5.1 RCIC, ADS, CS, and LPCI systems were operabic.

No significant event occurred.

The 2E41-N027 instrument was replaced and the 2E41-F012 valve was successfully operated and HPCI was declared operable.

Upon investigation of the failed 2E41-N027 pressure switch it was found that an unused set of contacts Iswitch

1. 2) was touching the bourdon tube such that the thermal expansion of the tube on switch #2 causing switch #1 (high HPCI pressure) pushed to activate.

Instrument personnel have been remind-ed to ensure proper cicarance of nonused switches in this type of instrument.

This is a nonrepetitive event, and there were no effects upon public health and safety due to this event.

The unit is now in full compliance with the requirements of Tech specs, and no further reporting is required.

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