ML20084S159

Telecopy Ro:On 730413,two Sustained High Reactor Pressure Switches,Which Initiate Isolation Condensor After 15 Delay,Found Out of Calibr.Cause Not Stated

ML20084S159
Person / Time
Site:	Dresden
Issue date:	04/16/1973
From:	Worden W COMMONWEALTH EDISON CO.
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20084S151	List: ML20084S148 ML20084S159
References
NUDOCS 8306160191
Download: ML20084S159 (1)

Text

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ICS IPiVEIA MVN 01237 TDVE MORRIS IL 112 04-16 535P CST PMS MR BOYCE GRIER, DIRECTOR DIVISION OF COMPLI ANCE 4

REGION THREE US ATOMIC ENERGY COMMISSION g 799 ROOSEVELT R0 GLEN ELLYN IL 60137 SU3 JECT DP4-25

( DRESDEN NUOLEAR POWER STATION UNIT THREE.

THIS WILL CONFIRM A CONVERSATION WITH MR MAURA 0F YOUR j

( OFFICE AT 1530 HOURS THIS DATE CONCERNING TWO SUSTAINED HIGh '

REACTOR PRESSURE SWITCHES BEING OUT OF CALI3 RATION. THESE PRESSUHE

< - SWITCHES ,1NI ATE ISOL AT ION CONDENSGR AFTEH A FIFTEEN SECO ND r.

. TIME DELAY. ON 4-13-73 PS3-263-533 WAS FOUND TO TRIP AT

- ,_[ 1075PSIG AND PS3-263-53D W AS FOUND TO TRIP AT 1073PSIG. TABLE j

3.2.2 0F THE TECHIN AL SPECIFIC ATION ST ATES THE TRIP LEVEL SETTING SHOULD BE LESS THAN OR EQUAL 10 1070PSIG. s OF-121 M L . , -

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AFTER THE CALIBRATION SWITCH 53B TRIPPED AT 1052PSIG ~ AND TH CWITCH 53D AT 1056PSIG.

W P WORDEN SUPERINTENDANT

&._JjDRESDEN NUCLEAR POWER STATI0ti e { COMMONWEALTH EDISON CO

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mac (YES-AGENT, NO-AD au~

16 n oAL DELIVEhY reqcested?

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