ML19257B358

LER 79-106/03L-0:on 791216,during Shutdown,Hpci Steam Supply Valves Closed at 116 Psig,Isolating HPCI & Violating Tech Specs.Cause Not Stated.Design Change Has Been Submitted to Change Setpoint of Pressure Switches

ML19257B358
Person / Time
Site:	Hatch
Issue date:	01/08/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19257B352	List: ML19257B351 ML19257B358
References
LER-79-106-03L-01, LER-79-106-3L-1, NUDOCS 8001150604
Download: ML19257B358 (3)

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Li,CENSF,E EVENT REPORT (PLEASE PRINT OR TYPE ALL REQUIRED INFCPVATION)

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%";0lL}@l0l510l010l31211l@l112l116 719l@l0l1 OIRlR 0l@ 68 69 EVENT DATE 74 75 REPORT DATE 80 7 60 61 DOCKET NUY8ER EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES Oio O 2 i During reactor shutdown, the HPCI steam supply valves closed at 116 psig, isolating O 3 1 HPCI, which violates Tech Specs requirements 3.5.D.1. This requires tht 'mCT m'ist O 4 remain operable if the reactor pressure is greater than 113 psig. ._ r e m ~ r. o l lO isi l effects upon public health and safety due to this event. This is a non-repetitive _

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41 lY l@ lN l@ lB 0 l6 l9 lg 3J 34 35 3' 40 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l The HPCI steam line low pressure switches, E41-N001A-D, were checked and found to be l ii iij set at 125 psig as required by procedure HNP-1-3304, HPCI Steam Line Pressure Instru-

, , i ment Functional Test and Calibration. This setpoint complies with Tech Specs require,

, 3 l ment Table 3.2-3 item 10, but violates paragraph 3.5.D.1. A design change has been 13 4 i submitted to change the setpoint of the pressure swtiches to a value greater (cont) l 7 8 9 80 STA S  % POWER OTHER STATUS bis O RY DISCOVERY DESCRIPTION i s l D @ l 0 l 0 l 0 lgl NA l Algl0peratorobservation l ACTIVITY CONTENT RELE ASED OF RELEASE AVOUNT OF ACTIVITY LOCATION OF RELEASE NA 7

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Georgia Power Company Plant E. I. Hatch Baxley, Georgia 31513 Reportable Occurrence Report No. 50-321/1979-106.

Cause Description and Corrective Actions (cont).

than 100% psig but less than 113 psig.  !

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NARRATIVE REPORT Georgia Power Company Plant E. I. Hatch Baxley, Georgia 31513 Reportable Occurrence Report No. 50-321/1979-106.

On December 16, 1979, while shutting down Unit I for a generator problem, the

1. g,41.y a_ a HPCI Steam Supply Valve closed at 116 psig which isolated HPCI. This violates ,

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Technical Specification requirement paragraph 3.5.E.2 which states that HPCI -

must remain operable if the reactor pressure is greater than 113 psig.

The HPCI Steam Line low pressure switches, E41-N001A-D, were checked and found to be set at 125 psig as required by Procedure HNP-1-3304, HPCI Steam Line Pressure Instruments Functional Test and Calibration. This setpoint complies with Technical Specification Table 3.2.-3, item 10, which requires the switches to be set equal to or greater than 100 psig. The setpoint of 125 psig was used in order to be more conservative than the requirements and prevent violations because of instrument drift.

A design change has been submitted to change the setpoint to a value greater than 100 psig but less than 113 psig.

A review of the Unit II Technical Specifications requiremer.tr and instrument setpoints revealed that the reactor pressure at which HPCI must remain operable is 150 psig and the instrument setpoint is 132 psig.

This is a non-repetitive event and did not effect the public health and safety.

1747 074

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