ML20003C393

AO-50-219/74/21:on 740313,bypass Valve RE22D Opened,Causing Main Steam High Flow Sensor RE22D to Be Inoperable.Cause Under Investigation.Instrument Technicians to Be Advised Re Critical Importance of Valve Lineup Checks

ML20003C393
Person / Time
Site:	Oyster Creek
Issue date:	03/13/1974
From:	Radier F JERSEY CENTRAL POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-74-21, NUDOCS 8103030363
Download: ML20003C393 (2)

Text

Initial Tolephone Date of R: port Date:

3/13/7e occurrence: _

3/13/74 Initial i*!ritten Time of

, Report Date:

3/13/74 Occurren ce:

0040 OYSTER CREEK SUCLE.\\R GENER\\ TING STATION FORKED RIVER, NEN JERSEY OS731 Abnormal Occurrence

' Report No. 50-210/74/ 21 IDENTIFICATION Violation of the Technical Specifications, Table 3.1.1.B.2, OF OCCURRENCE:

which specifies that the RE22 main steam line high flow sen-sors actuate at a differential pressure corresponding to a line flow of <120'. of rated steam flow (97.5 psid).

This event is considered to be an abnormal occurrence as de-fined in the Technical Specifications, paragraph 1.15B 6 G.

CONDITIONS PRIOR TO OCCURRENCE:

X Steady Stato Power Routine Shutdown Hot Standby

~ Operation Cold Shutdown Load Changes During Refueling Shutdown Routine Power Operation Routine Startup Other (Specify)

Operation The major plant parameters at the time of the event were as follows:

Power:

Core,1750 MWt Elec., S95 MWe 5

Flow:

Recirc., 15.1 x 10 gpm Feed., 6.46 x 10' lb/hr Stack Ges: 27,000 pCi/sec

,s DESCRIPTION At 0040 on March 13,19 /4, while taking daily Technical Speci-0F OCCURRENCE:

fication log readings, an operator neted and reported to the Shift Foreman that the differential pressure indicator for Sensor RE22D indicated 0 psid and that the instrument lines were hot. The operator found the RE22D bypass valve to be open, causing Sensor RE22D to be inoperabic.

Upon closing the bypass e e

Abnormal Occurrence Report No. 50-219/74/21 Page 2 valve, the RE22D differential pressure indicatiori returned to normal.

APPARENT CAUSE Design Procedure OF OCCURRENCE:

Manufacture Unusual Service Condition Installation /

Inc. Environmental Construction Component Failure Operator Other (Specify)

The apparent cause of this incident is under investigation.

ANALYSIS OF The safety significance of this occurrence is minimal as 7 of OCCURRENCE:

the 8 high steam flow sensors remained operable.

In the event of a high steam flow, 3 sensors were available to sense a high I

flow condition on Main Steam Line 1, and 4 sensors were avail-able to detect a high flow in Main Steam Line 2.

CORRECTIVE Recommendations will be made pending evaluation of the incident ACTION:

ly the Plant Operations Review Committee.

5 fif Prepared by:

b a N. L :'-

Date:

3/13/74

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