ML20003A083

Slide Presentation Entitled, Inadvertent Boron Dilution.

ML20003A083
Person / Time
Site:	Comanche Peak
Issue date:	10/15/1980
From:	WESTINGHOUSE ELECTRIC COMPANY, DIV OF CBS CORP.
To:
Shared Package
ML20003A081	List: ML20003A083
References
NUDOCS 8101290467
Download: ML20003A083 (17)

Text

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INADVERTENT BORON DILUTION a

HISTORY:

REGULATORY GUIDE 1.70 REV.1 (PRE-9/75) REQUIRED INVESTIGAT OF ONLY OPERATING MODES 1, 2 AND 6 (REACTOR CRITICAL AND l

', REFUELING).

ISSUANCE OF REG. GUIDE 1.70 REY. 2 REQUIRED THE INVESTIGATI OF ALL MODES OF OPERATION -

POWER OPERATION STARTUP .

' HOT STANDBY s

HOT SHlCDOWN l COLD SHUTDOWN -

REFUELING *  ;

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T ABt h_. I . I OPERATIONALu.c0E5 REACTIVITY  % RATED AVEF. AGE CCOLANT CONDITION. K df THERMAL POWER" TEMPERATURE

.uGDE POWER OPERATION > 0.99 > 5% > 350*F 1.

> 0.99 < 5% ~ > 350*F

2. STARTUP HOT STANDBY < 0.99 0 > 350*F 3.

4 HOT SHUTDOWN < 0.99 0 350 FF> T"V9

> 200

5. COLD SHUTDOWN < 0.99 0 5 200*F

6. REFUELING ** _< 0.95 0 _ 140*F

• Exclucing decay heat. ,

• • Reac cr vessel head unbolted or removed and fuel in the vessel.

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t RECUIREMENTS OF EVALUATION

PRIOR TO R.G. 1.70 REV. 2 -

TIME FOR OPERATOR RESFONSE FROM INITIATION OF DILUTION EVENT:

MODE 1 15 MINUTES 2 *15 MINUTES 6 30 MINUTES t

POST R.G.1.70 REV. 2 -

TIME FOR OPERATOR RESPONSE FROM INDICATION / ALARM THAT D

! EVENT .IS IN PROGRESS: ,

MODE 1 15 MINUTES 2 15 MINUTES 3 15 MINUTES

' 4 15 MINUTES

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5 15 MINUTES 6 30 MINUTES ,

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POTENTIAL CONCERNS ARE:

1. WHEN ON RHR - MODES 4, 5, AND

2. WHEN HAVE RC? FORCED FLOW SUT REACTOR 15 SUBCRITICAL s

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NOT CONCERNED WHEN:

1. IN MODE 6 - REFUELING CUE TO LOCK OUT OF'FLOWPATHS 4

' 2. REACTOR IS CRITICAL

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3. REACTOR IS INTENTIONALLY APPROACHING CRITICALITY AND UNDER  :

CLOSE OPERATOR CONTROL I

FOR 2 AND 3 NOT CONCERNED BECAUSE:

A. h DS WITHDRAWN - HAVE A MEANS FOR QUI'CK SHUTDOWN .

4 B. MANY ALARMS FOR OPERATOR NOTIFICATION WITH SUFFICIENT TIME TO RESPOND C. CONDITIONS BOUNDED BY.0THER ANALYSES

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CCNCERNS ARE POTENTIALLY WORSE WHEN 0.:* RHR SECAUSE:

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1. . SMALLER ACTIVE RCS V0Li'*4E (. 2500-5000 FT )

2. RHR FLOW RATES SMALL (3500-4 '00 GPM)

3. HIGHER INJECTION RATES FROM CENTRIFUGAL CHARGING PUMPS DUE' TO' LOW RC5 PRESSURE :(* 3C0-500 GPM 015 PSIA)-

4. SMALLER SHUTDOWN-MARGIN - 1% AK/K AT 200*F - .

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1 ECRON DILUTION EVENT ADDRESSED BY:

.i MODES 1, 2 -

SOUNDING ANALYSES IS UNCONTROLLED R0D WITHDRAWAL MODE 6 -

ADMINISTRATIVE CONTROL OF POSSIBLE DILUTION FLOWPATHS SY LOCKING VALVES CLOSED IN FLOWPATHS MODES 3, 4, 5 -

DETECTION OF DOUBLING OF SOURCE RANGE NEUTRON .

FLUX; RESTRICTIONS ON MAKE-UP FLOW RATES, AND INCREASES IN SHUTDOWN MARGIN AS REQUIRED THUS FOR A SUSCR.ITICAL SYSTEM,'THE BORON DILUTION DETECTION / MITIGATION "

i SYSTEM PREVENTS INADVERTENT CRITICALITY.

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APPROACH METHODOLOGY 4

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1. DETERMINED RANGE OF CRITICAL C3 TO BE COVERED

2. VERIFIED EZ"ECTED SOURCE RAf;GE COUNT RATES AFTER REACTOR TRIPS 4

USED DOUBLIriG OF SOURCE RANGE NEUTRON FLUX TO DETECT TRANSIENT 3.

AS EAhlY AS POSSIBLE j

4. DETERMINED DILUTION RATE / SHUTDOWN MARGIN COMBIriATIONS THAT SATISFY

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TIME CRITERIA

5. DEiERMINED APPROPRIATE OPERATOR / SYSTEM RESPONSE l

6. DEVISED MEANS OF DETECTING 00USLING OF SOURCE RANGE N'EUT i

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PERFORMED SEVERAL EVALUATIONS AS PART OF PROCESS:

1. LOOKED AT DATA ON:

t.) MAKE-UP PUMP CAPABILITY B) CHARGING PUMP CAPABILITY C) NUMBER OF PUMPS OPERABLE WHEN ON RHR D) SHUTDOWN MARGINS E) [ ] +c 4

400-500

2. DETERMINED THAT POTENTIAL EXISTS FOR INJECTION OF.UP TO GPM OF CLEAN WATER FROM RMWS TO THE CORE

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3. OETERMINED THAT[ ]PREDICTSAMORECONSERVATIVE ~

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_ TIME FOR FLUX DOUBLING, I.E. 3 TATER IN TRANSIENT, THAN[

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I 4 USING[ ] APPROACH TO CRITICALITY:

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2. [ ]

., 3. VERIFIED FROM PLOTS THAT ALARM ON FLUX DOUBLING COULD MEET TIME CRITERIA. CRITICAL PARAMETERS ARE BORON WORTH N4D SHUTDOWN MARGIN.

USED

4. DETERMINED THAT BORON WORTH OF[ ]PCM/ PPM IS CONSERVATIVE. '

TO DEFINE SHUTDOWN MARGINS.

5. ASSUMING DIFFERENT SHUTDOWN MARGINS, TIME FROM DOUBLING OF FLUX TO CRITICALITY WAS DETERMINED AND COMPARED TO NRC CRITERIA FOR EAi.H DILUTION RATE. /

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i AS A RE" ULT OF COMPARISCNS, THE FOLLOWING LIMITS ARE NECESSARY:

9 MODES 3, 4 SHUTDOWN [4ARGIN 1 6% aK/K

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! DIllRION RATE 1 20.0 PFM/ MIN [

MODE 5 -

SHUTDOWN MARGIN 1 1 0% aK/K DILUTION RATE 1 10.0 PPM / MIN u

l THE DILUTION RATES RESULT IN INITIATING SYSTEM-RESPCNSE s 2-3: MINUTES PRIOR TO CRITICALITY. THIS IS SUFFICIENT TIME FOR VALVE ACTUATION T0 4

CLOSE OFF THE CVCS AND TAKE SUCTION FROM THE RWST, AND PURGE THE LINL f

0F CLEAN WATER TO THE Rr5 COLD LEG.

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-DOUBLING OF FLUX' DETECTED BY:

l. SOURCE RANGE NEUTRON FLUK MONITORED WITH MICR0 PRO'ESSOR

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5. UPON DETERMINING FLUX HAS DOUBLED'- ALARM SOUNDED, VALVEI MOVEMENT INITIATED i

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i ADV#iTAGES OF USE OF MICROPROCESSOR:

1. ALLOWS DETECTION OF A LONG TIME CONSTANT EVENT, CAN DETECT POWER ESCALATIONWITHREACTORPERIODASLONGAS[ ]+.c dCONDS

2. ELIMINATES DIFFICULTIES ASSOCIATED WITH DETECTING A SMALL SLOPE CHANGE OVER LONG PERIODS OF TIME IN A LOG SIGNAL

3. NOT - SUSCEPTIBLE TO NOISE AND LOW COUNT RATE STATISTICS 9

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RESULTS:

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1. USE MICROPROCESSOR TO DETECT DOUBLING OF SOURCE RANGE NE'JTRON FLUX AND TRIGGER ALARM / SYSTEM RESPONSE

! 2. COMANCHE PEAK WILL AUTOMATICALLY OPEN RWST ISOLATION VALVES AND 4 CLOSE VCT/CVCS ISOLATION VALVES e

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3. REACTOR MAKEUP WATER FLOW RATES INTO CVCS RESTRICTED AS NECESSARY ,-

TO ALLOW TIME FOR -DE'ECTION/ RESPONSE 1

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IMPACT ON PLANT:

A. HARDWARE CHANGES 1 ADDITION OF FLUX COUBLING CIRCUIT TO SOURCE RANGE

2. MODIFICATION OF PROTECTION SYSTEM TO INITIATE VALVE t

- MOVEMENT

3. ADDITION OF ALARM-

4. RESTRICTION OF RMWS TO CVCS SY ORIFICES OR THROTTLE .

VALVES B. OTHER CHANGES

1. RESTRICTION ON RMWS FLOW CA!! INCREASE DILUTION TIMES FOR PLANNED CRITICALITY- .

.. 2. ADDITIONAL REQUIREMENTS ON SOURCE. RANGE OPERABIL.TY~

IN MODES 3, 4, AND 5 - .

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SUMMARY

DISTRIBUTI0ti 3AN 14 m Docket File D. Muller NRC PDR R. Ballard Local PDR W. Regan NSIC D. Ross

,_ TIC _ , P. Check

JERA M R. Satterfield . -,

NRR Reading O. Parr l' ,

LB #2 File F. Rosa  ;

H. Denton W. Butler . ;j E. Case W. Kreger q D. Eisenhut R. Houston . O R. Purple T. Murphy  ;?j B. J. Youngblood L. Rubenstein a ~5 T. Speis u 5 A. Schwencer -

F. Miraglia W. Johnston J. Miller J. Stolz C. Lainas S. Hanauer R. Vollmer W. Gammill J. P. Knight F. Schroeder R. Bosnak D. Skovholt F. Schauer M. Ernst R. E. Jackson R. Baer Project Managerj84/Cg1 _C. Berlinger Licensing Assistant MService ~K. Kniel Attorney, OELD G. Knighton I&E (3) A. Thadani ACRS (16) D. Tondi R. Tedesco D. Vassallo G. Lear J. Kramer V. Noonan P. Collins S. Pawlicki D. Ziemann V. Benaroya S. Ramos Z. Rosztoczy S. Schwartz W. Haass Others: I NRC Pi2rticipants:

N. M M 7 Maock 6 O rr M. Os**%td L T. Dansk o.r.ano a.m rn > }

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p. SWe.c S Di8d> l BCC: Applicant & Service List l}