ML20126E216

Submits Info in Response to 640326 Request Re Changes to Tech Specs Change Requests 47 & 49 & Supplements Info Submitted on 640521.Provides Outline of Physics Tests to Be Run on 44-bundle Core

ML20126E216
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	07/15/1964
From:	Haueter R CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To:	Boyd R, Case E US ATOMIC ENERGY COMMISSION (AEC)
References
NUDOCS 8101150364
Download: ML20126E216 (4)

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BASED UPON TELEPHONE CONVERS ATIONS WITH YOUR STATT ON 7-14-61, Co.tStiMERS POWER COMPANY SUBMITS THE TOLLOWING INFORMATION WITH RESPECT TC TXE MALC'W 26, 19 4 REQUEST TOR CERTAIN CHANCES TO THE BIC ROCX POINT WUC' EAR PLANI TECHNICAL SPECITICATIONS, DOCEET 50-155, AND TO THE TURTHD IKTOR*

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MATION SUB"ITTED ON MAY Ei, 19 4. .

CHANGE NO. 47 IN ADDITION TO THE PLANNED SYMMETRIC CORE CONTIGURATION RECCRTLT SUBMITTED, IT IS PROPOSED THAT USE OF A SKEWED CORE ALSO FI LFPToVED, ALONG WITH SOME RELOCATION OF DEVELOPMENTAL TUEL BUNDLES WITMIM THIS e 00RE AS TOUND TO BE DESIRABLE FOR POWER DISTRIBUTIO!!, THIS SKEWED CO C J0 '>f' '

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P00R QUAUTY PAGES

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(_ y ~HF. V sV IDJ;. y WOULD BE LOCATED ONE GRID. POSITION TO THE lei! Os

- ' SUBMITTED CONFIGURATION, AND MAY POSSIBLY HAVE TO BE USED TO PROVIDE IT IS ALSO PROPOSED. .f ADEQUATE START-UP COUNT RATE AND VISIBILITY.

d2s THAT THE USE OF A LOW LEVEL IN-CORE FISSION COUNTER, PRESENTLY INCORPORATED IN ONE OF THE IN-CORE MONITOR PROBES, DE APPROVED FOR USE?

AS A START-UP DETECTOR, PROVIDED THAT ITS USE IS FOUND TO BE NECESSARY. l THE SOURCE POSITIONS ASSOCI ATED WITH THIS SKEWED CORE WO .

AND 8-58 OR 1-58 AND 8-53. ,

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AN OUTLIt'E OF THE PHYSICS TESTS TO BE RUN ON THE 44 BUNDLE COR i

PRESENTED BELOW. THE PURPOSE OF THESE TESTS IS TO PROVIDE A SAFI AND EFFICIENT MEANS OF DETERMINING THE ADEQUACY OF THE START-UP l

MENTATION RESPONSE TO REACTIVITY ADDITIONS.  ?

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1. START WITH SYMMETRIC CORE VITH SOURCES AT 2-58 AND 9-53.

WITH LL RODS IN, TAKE READINGS ON START-UP CHANNELS 6 AND 7, TWO LOW-LEVEL IN-VESSEL CHAMBERS, ALL REMAINING OUT OF CORE NEUTRON l SENSITIVE INSTRUMENTATION AND ON THE SPECIAL IN-CORE TISSION CO PULL ONE OR MORE FUEL BUNDLES NEXT To A SOURCE To DEMONSTRATE T ,

AFTER INSTRUMENTATION IS SEEING PREDOMINANTLY FISSION NEUTRONS.

REPLACING FUEL, PULL RODS TO ESTIMATED KEFF 0F .970, .980, .990, l

.995 AND 1.0. AT EACH POINT, TAKE READINGS ON ALL INSTRUMENTS To ASCERTAIN ADEQUATE INSTRUMENT RESPONSE. )

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2. IF SUFFICIENT C0'NT U RATE IS NOT PRESENT KT THE START OF l

-1, MOVE SOURCES TO 2-53 AND 9-58 AND RUN TEST AS DESCRIBED IN -1. .

OR -2 , RELCAD

3. IT SUFFICIENT RESPONSE IS NOT OBTAINED IN RUN TESTS AS TO THE SKEWED CORE AND MOVE SOURCES TO 1-58 AND 8-53. .

DESCRIBED IN -1.

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. 4. IT NOT SUTTICIENT MINIMUM COUNT RATE, MOVE SOUP 3CES TO ,

1-53 AND S-53. RUN TESTS AS DESCRIBED IN -1 .

CHANGE NO. 49 3

IT IS PROPOSED THAT CHANGE NO. 49 BE DELETED. THIS IN TURN WOULD DELETE THE VISIBILITY REQUIREMENT -TROM THE BIC ROCK POINT TECHNICAL SPECIFICATIONS.

ANALYSIS -

SECTIONS 12.7 AND 12.13.2 0F THE BIG ROCK POINT NUCLEAR PLANT TINAL HAZARDS SbMMARY REPORT DESCRIBE THE ANALYSIS OF THE WORST CONCIEVARLE i

START-UP ACCIDENT. IN THIS ACCIDENT IT IS ASSUMED THAT A NONSTANDARD R0D PATTERN CONTRIBUTING TO MAXIMUM ROD WORTH HAS RESULTED TROM VIOLA-TION OF R0D WITHDRAWAL PROCEDURES AND THAT BOTH THE SHORT PERIOD SCRAM AND THE SCRAMS AT 120 PERCENT OF PIC0 AMMETER RANCE ARE INOPERATIVE EVEN

. AND THAT THE REACTbR SCRAMS 4T 125 PERCENT OF RATED NEUTRON TLUI.

WITH THESE ASSUMPTIONS, THE ANALTSIS SHOWS No DAMAGE TO THE CORE, AND CENTER TUEL TEMPERATURES OF ONLY 1950 DECREES T.

IN THE NORMAL CASE WHERE THE PIC0 AMMETER TRIPS AT 120 PERCENT OF RANGE, AND IF VE ASSUME THE REACTOR IS JUST SUBCRITICAL PRIOR TO THE R0D WITHDRAWAL, THE PIC0 AMMETERS WOULD SCRAM THE REACTOR AT ABOUT 125 TIMES TEN TO THE MINUS SIXTH PERCENT OF TULL POWER. l

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IT WAS PREVIOUSLY POINTED OUT AT AN ACRS MEETING THAT T CORE IS CLOSELY COUPLED AND THAT CRITICALITY IN ANY PART OF TH CONSUMERS  ;

VOULD BE ALMOST EQUALLY SEEN BY ALL THREE PICOAMMETERS.

POWER COMPANY FEELS THAT NO HAZZARD EXISTS WITH RESPECT TO COi FROM A ROD WITHDRAWAL ACCIDENT AND THAT REMOVAL OF THE VISIBIL QUIREMENT WILL HELP TO PREVENT PERIOD OR FIC0Af1 METER SCRAMS BR BY HIGH ROD WORTMS It! TIC CONTROL ROD WITHDRAWAL PATTERNS N P

MEET THE VI$tBILITY REQUIRMINTS.  ?

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NO.i l DATE OF DOCumMedia DATE RfCElvtD FeOM, cte :tPOOJtCGG M 74 % 7M h e

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H. L, !!aueter Islogram  !

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0, 17 cys verifamed Ccas (Atta Dayd) n Dart ANswERcD, ACTION NECESSARY  % CONCURR[NCE O COmaENT O 8vi l NO ACTION NECESSARY O PO51 OFFICE FILE CODE:

Ct.A157.i REG NO RECEIVED SV DATE REFERRED TO DATE DESCRIPTION- (Must Se Uncessified) hegp info with res-eet to thi M8 I~g se lktaittid recue for certain efianges to the l'RrW Tech Spees, pnd to the further w/llext. ras--FOR ACTI(M info sutWtted 5-2144-use of a skewed C Ore s ENCLO5UREb itaaRs.. Dietribu tion 1 - formal file 1 - suppl file 1 - M C PDR 1 - 000 '

1 - H. Cteele

? - Comnliance U. 5. ATOMIC ENERGY COMMISSION MAIL CONTROL FORM FORM AEC (6-60) 3265

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