ML20126F604
| ML20126F604 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 03/04/1974 |
| From: | Perkins T NIAGARA MOHAWK POWER CORP. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| AO-50-220-74-1, NUDOCS 8103190017 | |
| Download: ML20126F604 (1) | |
Text
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- 50. O 74 1 O
ADN(W!'.1. OCCuliENCE
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sPnAy !!rt.Dnn nirF, PRESS-RVJOA r
ON fEliRUAky 25, 1974, DUF.D:G ROUTINE SURVEILUJtC0 TESTING, ONE CORE SPFM DIFFERDTTT A1. PRE 55URE INSTRlW.h7 (RV 30A, btRTON 288 4802) KAS Folr@ TO AciUATE LOWER THAN THE YALUE AS SPECIFIED ON THE SURVEILUd!CE CHECK LIST.
NOMINAI SET POII:T 'IS 5 PSID AND 71!E INSTRU'iENT OPERATED AT 3.5 PSID.
REASON TOR Tile CIUJ;GL IS ATTRILUTED TO SET P01tfr DR1TT. A MODIFICATION 10 THE EAR 10N
.SNITCil KILL BE DONElki!ICil Sil0VLD SUESTA!TI AbbY ELIMINAE DRM IN.EESE
=t ninsE INSininTNTS ARE Drs!GNED AND IN1 ENDED '10 PROVIDE /d4 AUd'.M ONLY AND sdRVE NO PROTEC'TIVE CIRCUITRY FUNCTION.
utE PRIMAhY FUNCTION OF 'lHESE INSThlD!ENTS IS TO INDICATE A LOSS OF ThTEGRITT OF T11E COF.C SPRAY, PIPING BL'IFECp Tiln REACTOR VESSEL WALL AND 'lHE SHROUD INSIDE
'lHE P1AC1CR VES$hl.
IF LOSS OF IN1EGRITY 5HOUI.D OCCUR THE DIFFEREhTI AL PRES 5URE INSTRU".ii7 KOULD READ r55ENTI ALLY RtCIRCULATION PINP DIFFERE)TII AL PRESSUREINTHEPkNGEOF20-2SPSID.WITH THE LOWEPID SET POTbT ON VIIs INS 1nd!!.ENT THE AL5JU! KOULD OCCUR SCONER TilEREFORE T)lE CllANGE KA5 CONSERVATIVE AliD NO llAIARD WOUTO llA\\T. BETN PRE 5NF.D TO THE PUdtT OR THE GENERAL PUBLIC.
Bl0 TESTRI.K.hT WAS CALIBRATED TO NOMINAL VALUE PENDING O E CT OF TME S W POINT MODIFICATION.
T.J. PERMINS STATI0'; SUPERINTTJ:nENT NINE MILE P01tTT NUCLEAR STATION 2/ o3l900/7