ML17252A998

Letter Confirming a 03/19/1973 Conversation Concerning the Discovery of 13 of the 16 HPCI Room Temperature Switches to Be Above the Technical Specification Limits - Dresden Unit 3

ML17252A998
Person / Time
Site:	Dresden
Issue date:	03/19/1973
From:	Worden W Commonwealth Edison Co
To:	Giambusso A US Atomic Energy Commission (AEC)
References
Download: ML17252A998 (1)

Text

RB G

T\JJX NO 8 6

1. 50-249 U#.

R B TWX NO 8 6 1 SAEC HQS GTWN TLXA1B9 WAB216Cl656)Cl-02474gC078)PD 0~/19/73 1653 ICS.IPMVEIB MVN '

ZCZC 02087 MORRIS ILL 166 03-19 247P CST PMS MR A GIAMBUSSO .

DEPUTY DIRECTOR FOR REACTOR PROJECT DIRECTORATE OF* LICENSING US ATOMIC ENERGY COMMISSION .,

WASHDC, .

SUBJECT DPR-25 .DRESDEN NUCLEA~ POWER STATION UNIT3 THIS WILL CONFIRM A CONVRSATION WITH MR H DANCE OF YOUR OFFICE CONCERNING*HPCI ROOM TEMPERATURES SWITC8ES OUT OF CALI BRAT ION. , . .

WHILE CONDUCTING REFUELING OUTAGE CALIBRATION, 13 OF THE 16 HPCI ROOM TEMPERATURE SWITCHES WERE FOUND ABOVE THE TECHNICAL SPECIFICATION LIMITS. THESE SWITCHES ARE DEISGNEQ TO $ENSE HIGH TEMPERATURE IN THE.HPtI ROOM IN THE EVENT OF A PIPDrG BRAKE ~ND ISOLATE THE HPCI STEAM SUPPLY.

TAB~E 3.2.1 OF THE ftCHNICAL SPECIFICATION REQUIRES THAT THE TRIP SETTING BE LESS THAN OR EQUAL TO 200 DEGREE FAHRENHEIT DURING

'CALIBRATION, *3 SWITCHES TRIPPED .AT,202 DEG~EES FAHRENHEIT ONE AT 203 DEGREES FAHRENHEIT 1 AT 206 DEGREES FAHRENHEit .

1 AT 208 DEGREES.FAHRENHEIT 3 AT 210 DEGREES FAHRENHEIT AND 1 AT 212 DEGREES FAHRENHEIT 3 SWITCHES DID NOT TRIP BELOW ~12 D DEGREES FAHRENHEIT ~~E MAXIMUM .TEMPE~ATURE UTILIZED IN THE CALIBRATION PROCEDURE *. ALL SWitCHES WRE RESET TO, TRIP AT 190 TO 195 DEGREES FAHRENHEIT W P WORDEN SUPERINDENET COMMONWEALTH EDISON DRESDEN NUCLEAR POWER STATION RURAL ROUTE 1 MORRIS ILL I .

USAEC H-QS GTWN MAR l 9 7 3 0 PES.T v!U WSH I 1835

~**

1835 I