05000321/LER-1980-023-03, /03L-0:on 800224,during Startup W/Mode Switch in Startup & Hot Standby,Hpci Sys Did Not Become Operational at 133 Psig Per Tech Specs.Caused by Design Deficiency & Instrument Drift.Pressure Switches Recalibr

/03L-0:on 800224,during Startup W/Mode Switch in Startup & Hot Standby,Hpci Sys Did Not Become Operational at 133 Psig Per Tech Specs.Caused by Design Deficiency & Instrument Drift.Pressure Switches Recalibr

ML19312D182
Person / Time
Site:	Hatch
Issue date:	03/10/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19312D181	List:
References
LER-80-023-03L-01, LER-80-23-3L-1, NUDOCS 8003210416
Download: ML19312D182 (2)

LER-1980-023, /03L-0:on 800224,during Startup W/Mode Switch in Startup & Hot Standby,Hpci Sys Did Not Become Operational at 133 Psig Per Tech Specs.Caused by Design Deficiency & Instrument Drift.Pressure Switches Recalibr

Event date:
Report date:
3211980023R03 - NRC Website

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60 61 OOCKET NUMBER E.3 trJ EVENT DATE 74 75 HEPOf t T DATE 41 0 EVENT DESCRIPTION AND PRODADLE CONSEQUENCES h o 2 l During Reactor startup with the mode switch in startup_nnd hot standby.

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the llPCI system did not become operational at 113'psig as specified in l

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Technical Specifications 3.5-0.1.

The system was not operational l

.h O s l until 127 psig. There were no ef fects upon public health and safety due l

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l0 lij l Reportable Occurrened Report No. 50-321/1979-106.

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40 el 42 43 44 47 CAUSE DESCniPTION ANDCORRECTIVE ACTIONS h gl This failure is due to a design deficiency and instrument drift. The l

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The pressure switches were recalibrated to specifications. Future cor-l i 3 l

rective action includes a design change to the pressure switchen and the l

3 l4 g l pursuit of a document change to the present Tech Specs.

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Ceorgia Pober. Company;

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Baxley,1 Georgia.31513)

Reportable -. Occurrence Report No. 321/1980-23.

DuringEreactor startup with' the mode switch in. startup' and hot standby position,

the IIPCI System did nor -becomo operational: at 113 psig 'as specified in Technical

- (Specifications Section 3.5.D.'1.

There were no effects upon public health and

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r safety'duetto.this event. This is a repetit!1ve occurrence as last _ reported on Reportabic Oclcurrene,c - Report. No. 321/1979 106. This report addressed i

the problem of IIPCI Lisointing at 116' psig. Tachnical Specification Section 3.5-D.1 requires that 11PCI be operational:if.the reactor pressure is greater thanill3Lpsig. Prior 'to LER.50-321/1979-106, the switches, IE41-N001A-D, setpoint was:125 poig. '-This setpoint complied with Tech Specs requirement Table 3.2.2 which requires the switches to be set equal to or greater than 1000psigi sbut ;does not comply ~ with Tech Specs Section. 3.5-D.1 which required.

_'llPCI tolhe. operational rt 113 psig. The inherent: prob 1cm was first recognized at.'this point. A' design change-was submitted to change the netpoint to a'value 6

greaterithan'100 psig but Icos than 113 psig.

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.On February 24,1980' 11PCI'did not become operational at reactor pressure c qual to 'or; greater. than ' 113 psig. The calibration of the llPCI Steam Line

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c Low Pressure Switches was checked and found as follows:-

N001A. trip 90.7' psi, reset 127.7 psi.

~ N001B trip 98.7 psi,. reset.123.7 pai.

N001C trip 100.7 psi, reset.13'2.7 psi.

N001D.LYip 98.7 pai, reset 123.7 psi.

1Three of the-switches A,' B and D were found below the acceptance criteria

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~ of' actuation ~at - greater thmi 100 psig.: The exoccted actuation point is

'The dif ference' between the ' expected actuation and the L'

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6 Jactual trip point is attributed to instrument setpoint drift.

i 1The manufacturer of these switches is Darksdale.. The' specifications of-the

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switch permit-a react span different'.alc of 11 to 40 psig and.is not adjustabic.

Decause of the wide differential, the switches cannot be adjusted to meet the Spresent Tech Spec requirements.-

The planned eorrective;" action willIinclude t!io following.

A design: change to T

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the pressure switches to meet the Technical Specification requirements.is being e

g Jinvestigatedh. Unit.II Tdchnical, Specifi' cations (Standard Tech Specs)- require 3

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s ithat -11PCI be' operational at pressures cqual'to or greater than 150 psig.' AJ fe$;

< proposal"to' change Unit [I Tech ' Specs concerning 11PCI:to Standard Tech Specs 'is sq.

• Theing7 investigated. : A follow-up. report will be submitted.z

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