ML20024B516

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Responds to 790405 Questions Re Analyses of Lomfw Flow for 177 & 205 FA Plants Based on Analytical Results Obtained from Cadds Simulation Studies of TMI-2 Event
ML20024B516
Person / Time
Site: Crane  
Issue date: 04/30/1979
From: Labelle D
BABCOCK & WILCOX CO.
To: Roy D
BABCOCK & WILCOX CO.
References
TASK-06, TASK-07, TASK-6, TASK-7, TASK-GB GPU-0288, GPU-288, NUDOCS 8307090066
Download: ML20024B516 (4)


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,f f4 T.nstruction #166

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  • THE BABC0CK & WILC0x COMPANY O

POWER GENERATION GROUP C0s'E. A4'V0 MACE 0.*[

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D. V. LAstil!. R CA T. SA'ITY ANALYSIS (2117)

I Fil' No.

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APRIL 30. 1979 9 00 A.

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'r tory ret 177 s ?M FA Pt.LTs trioc sr To c s toss c r

.RITERD;CE:

D. R. 107 TD E. A. VCMACE. " ANALYSES OF LOMDi TIGTECE Q

9.

W-177 & 205 TA FLA:rIS", APRIL 5,1979.

r u-THIS IfDio IS TO RESPOND TO SECRAL QUISTIONS RAISD ET TCU IN,..

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N THE ABCTE RITERENCE. TEE RESPONSES ARE BASID ON ANALTTICAL RESOLTS CSTAIND, - "

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L FOR THE MOST FART, TRCtt CADDS SDC;I.ATICN STUDIES CT THE :MI-2 ETENT. A LOTW

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a-ANALYSES RI?CRI VILL BE COMPLEID S/4/79. VRICH VILL DCLUDE ANSVIRS VITE V

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IF AUZII.IARY TIDVATER EAD BED DITIATD ll0R*AII.T. V0;LD THE 3

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OPERAICR BAYZ BIEN CONTRCNID WITH A TILLDC CR TII.LD FFISSORIZER!

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TES, THE FRESSORIIZ1 WOUID,STILL EAVE FIILED DCE TO HPI ACT"4 ICE a

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FEIDWATIX INITIATED NCD!ALI.T 90CI.D HAVE BEDI ABOUT 4 MDUTES LCNGZ1 TRA5 A21M,I-2.,

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QUESTION 2 ASS:; MING TE ACIILIART TEDWATER VAS DELAYD AS AT TMI-2. IT THE

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ELECTROMATIC RD.IIF TALTE HAD RESEAID. WOULD THE CORE REMAIN

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TES. WITMCUT THE STOCE-OF 28 PCR7 TEE SYSTIM bu d.D HAVE RIT'.*ENID TO

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A EI 3 FCSSURE SITUAUON CNTIL SUCH TDE AS THE ACIILIART TED-

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RESPONSE.V QUESTIONS CN LOTW s.

TOR 177 6 20$ A FIsUTS

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D A BOT SICTD0'.'N CONDITION. EFI WOULD NOT HA7E BED INITIAID D THIS SCDARIO. SOME SMAt.L LOSS OF RC DVENIORY WOULD OCCUR

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TEROUCH TEE FORY AND TVD-FEASE TORMATION MAY BAVE OCCURRED FRIOR f-U TO Al"J AGIION.

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QUESTION 3:

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WITE THE AL'IILIARY TEI:T=*ATER DELATD AND ELEa:TRCMATIC RII.IET VALVE D.

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STUCE AS U TMI-2, WOULD TEE CORE EAVE RIMAD Q COVERED IT THE EFI

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TES, SMAI2. BREAE LOCA STUDIES BAYE VERITID THAT EFI TDW IS SUTTI 5 6

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ELECTR2ATIC RELIIT VALYZ (0.007 f t ).

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A) WOUD RAIS!NC THE BOTTOK OF THE PRISSURIIER ABOVE THE ELE 7ATICN CF.

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THE SURCELINE NCIILE ON THE CANDY CANE,MAIE A MAIERIAL DITTERENCE.

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B) WOULD MAKDC THIS CHANGE IN ELETATION OF THE FRESSURII.E1 FR07DE -.

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A) NO, RAISDC THE BOTTOM CF, THE FRISSURIIER WOULD HA.VE MADE NO MA*.ERIA!.

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B4W EAS DEIERMUD THE LEVEL BDICATION WAS CORRECT (VITHIN t 2 ft.) '

P AND THE TILLDC RATE CAN BE ACCOUNTED TOR BY SYSTEM S'* ELL AND EFI F.

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ACTION.. _THE LOOF SEAL ETTICT.OT CUR FRESSURIIER DESIGN DOES NOT CCME P.-

p DTD FLAT UNTIL STEAM.WAS FRESENT IN THI (RIv..ARY E,CT LEC AND THE F.-

6 ELECTRCMA!!C RELIET VALVE VAS CLOSD. ' ADc! IONAL DTCRMATION VIIL BE

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TOR 177 & 205 FA PLANTS j g; APRIL 30, 1979 9:00 A.M.

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WHAT CAN BE DONE TO PRQ7DE SUBSTANTIAL MARCD BETWEEN PEAE STSTm

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FRESSURE ATTER REACTOR TRIP AND TEE SETPCINT TOR CPENDiG OF THE

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Ui THIS CONCERN BAS RED ANSWERD SUBSEQCDT TO ISSUANCE OF YOCR p.,

6 REFERDCE MEMO. MARCIN BETWEEN PEAE STSTM FR. ESSURE AND ELECTRO-M.. -
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McIC RELIIT VALVE SETFCINT RAS BEEN' FRO 7DD TOR ANTICIPAIID

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MATIC RELIET TALTI SETFOINT.DRITT SUCE THAT A REACTOR TRIF UCCLD r

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Too SUCCEST IN SATETr SYSTm3 AND SETFOINTS u QR:ER TO DSURE E'

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RESPONSE

b THE IMMEDIATE, SHORT TERM ACTION TAKIN TO DATE. I.E., RESETTINC 3,

TRIF AND ELECTROMATIC SETFCINIS, CPERATOR USTRCCTIONS TOR HFI -

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AND ELECTRO? TIC MANUAL ACTIONS ARE SUTTICIENT.

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