ML20151C142

AO 50-219/74/2:main Steam Line High Flow sensors,RE22C & RE22E Actuated at Differential Pressure of 100 Psi Greater than Tech Specs.Cause of Setpoint Change Being Investigated

ML20151C142
Person / Time
Site:	Oyster Creek
Issue date:	01/17/1974
From:	JERSEY CENTRAL POWER & LIGHT CO.
To:
References
AO-50-219-74-2, NUDOCS 8103040582
Download: ML20151C142 (2)

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Report Dateg _

1/9/74

' Occurrence:

1100 OYSTER CREEK NUCLEAR CD1ERATING STATION FORKED RIVER, NEW JERSEY 08731

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Abnormal Occurrence port No. 50-219/74/4, IDENTIFICATION -

Violation of the Technical Specifications, Table 3..171.B.} and.1,

.0F OCCURRD;CE:

which specifies that the RE22 Main Steam Line high flow sensors hctuate at a differential pressure corresponding to line flows l< 120% of rated.

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i 1his event is considered to be an abnorcal occurrence as de-fined in the Technical Specif1. cations; paragraph 1.15A CONDITIONS PRIOR TO OCCURRENCE:

X _ Steady State Power

__.Routino Shutdown Hot Standby Operation Load Changes During Cold Shutdown Refueling Shutdown

~ Routine Power Operation Routine Startup Other (Specify)

Operation

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llin reactor was operating 'at approximately 1827 MWt wit

• a 6

recirculation flow of 61X10. 8/hr when the surveillance test was conducted.

$ESCRIPTION During the routine monthly surveillance testing of the RE22 0F OCCURRENCE:

Main. Steam Line high flow sensors, it was observed that the RB22C and RE225 sensors actuated at a differential pressure

~ f 100 psi, one in cach of the two safety systems. This is o

gren'ter than the maximum allowable level of 97.5 psid which

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corresponds to a Main Steam Line flow 120% of rated.

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.n ms.40CUMENT 00NTAINS P0hRAUAUTY PAGES 1.

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Rapprf. No. 50-219/74/2 Page 2,.

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., Procedure APPARENT CAUSE Design Unusual'Scrvice Condition OF OCCURRENCE:

Hanufacture Installation /

Inc. Environmental Component Failure

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Construction' 0ther (Specify)

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The cause of the failure is under investigation.

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ANALYSIS OF The safety significance of this event is in the loss of OCCURRENCE:

system redundancy. Had a high flow event developed, the L'edundant sensors RE22A, B, D, F, G, and H would have performed the isolation funct.'.on.

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t CORRECTIVE Each of the two sensors were recal.ibrated and returned to service as the failures were discovered.

ACTION:

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FAILURE DATA:

Manufacturer:

B'arton Type:

Indicating Differential Pressuro Switch Range: 0-200 psid Series:

RB22C - 224-19938

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RB228,- 278-770

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