05000336/LER-1980-019-03, /03L-0:on 800411,during Routine Power Operation, RCS Pressure Was Below Tech Spec Requirement for Approx 3 Minutes.Caused by Overshoot in Pressure Control Sys During Slight RCS Pressure Adjustment

/03L-0:on 800411,during Routine Power Operation, RCS Pressure Was Below Tech Spec Requirement for Approx 3 Minutes.Caused by Overshoot in Pressure Control Sys During Slight RCS Pressure Adjustment

ML19323C913
Person / Time
Site:	Millstone
Issue date:	05/13/1980
From:	Rothgeb R NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19323C911	List: 05000336/LER-1980-019, Forwards LER 80-019/03L-0 05000336/LER-1980-019-03, /03L-0:on 800411,during Routine Power Operation, RCS Pressure Was Below Tech Spec Requirement for Approx 3 Minutes.Caused by Overshoot in Pressure Control Sys During Slight RCS Pressure Adjustment
References
LER-80-019-03L, LER-80-19-3L, NUDOCS 8005190407
Download: ML19323C913 (1)

LER-1980-019, /03L-0:on 800411,during Routine Power Operation, RCS Pressure Was Below Tech Spec Requirement for Approx 3 Minutes.Caused by Overshoot in Pressure Control Sys During Slight RCS Pressure Adjustment

Event date:
Report date:
3361980019R03 - NRC Website

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8 60 61 COCKET NUMBE R 68 69 EVENT DATE I4 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h OT 1 IDuring routine power operation, the reactor coolant system pressure was less than that j 10 i33 l required by Technical Specification 3.2.6 for a period of approximately 3 minutes.

The l la l4 j l pressure fluctuation was the result of an overshoot in the pressure control system l

l Isl lduring a slight RCS pressure adjustment.

There are no probable consequences since the l

c ls i l Unit was operated in accordance with Technical Specifications 3.2.6.

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33 34 JS 36 31 40 48 42 43 44 4y CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 i l0 l IAn operator readjusted the RCS pressure control from 2260 PSIA to 2250 PSIA.

The spray I i s i j l valves opened and resulted in an overshoot that decreased pressure to 2207 PSIA.

The i

i i,, l spray valves were shut and all pressurize heaters were energized.

RCS pressure was l

il3l l restored to greater than 2225 in approximately 3 minutes.

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