ML20004E036

Selected Viewgraphs from 810430 Meeting

ML20004E036
Person / Time
Site:	Midland
Issue date:	04/30/1981
From:	PLG, INC. (FORMERLY PICKARD, LOWE & GARRICK, INC.)
To:
Shared Package
ML20004E035	List: ML20004E036
References
NUDOCS 8106110020
Download: ML20004E036 (12)

Text

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O ENCLOSURE 3 Selected Viewgraph Slides Viewed During Meeting Presentations April 30,1981

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f:[-[ ' AUXILIARY FEEDWATER SYSTEM i -(Simplified)

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', CONDENSAT O ST AGE COOLING ^ >Q j j ,, . POND II

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CONDENSATE

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, CONDENSER HOTWELL AND TANK MS - ATM P i;. DEAERATOR M 4~

STORAGE TANKS 3

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AC M MOTOR-DRIVEN M AFW PUMP CONDENSATE AC STORAGE N

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AUX!LIARY FEEDWATER DHSCMARGE COMPDGURATHOM

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• ' BATTERY-BACKED i--iFOGG AB l POWER SUPPLY I

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AUX! LIAR'( FEEDWATER I

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FEED a

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! OTSG A PRESSURE , SP/h a SP OTSG B PRESSURE y j OTSG B PRESSURE Kf OTSG A PRESSURE O

MANUAL BLOCK 3 ) t c MANUAL BLOCK i

MANUAL ACTUATION i MANUAL ACTUATION j y v v l

"OR" GATES i

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TO VALVE LOGIC - TO VALVE LOGIC c ' 5" 'a t FEED-ONLY-GOOD GENERATOR LOGIC CHANNEL A '

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(typical for Channels B, C, and D)

FIGURE 4-7 1

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4 AUXILIARY FEECWATER TYP[ CAL STEAM GEKERAT@R .

aaam L649" TOP OF UPPER TUBESHEET tx:

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-620" LEVEL TAPS *

~607" AFW INLET NOZZLE NOZZLE ~

WIDE-RANGE s

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LEVEL (s. " ' ' ' "

2 i l, TRANSMITTER (LT) yalves

-246" NORMAL LEVEL (ramped) if RCPs OFF i

NARROV/-RANGE LEVEL ~

\ x--aaam -102" LEVEL TAPS

• TRANSMITTER LT

! -30" NORMAL LEVEL IF RCPs ON t>4---aamm -6" LEVEL TAPS *

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• NOTE: Four narrow range i 0" TOP OF LOWER TUBESHEET' and four wide-range '

AT EL 605'-7" transmitters per OTSG. Transmitters share bottom taps.

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{ FIGURE 4-1 1

4 LT [DE,R.

g GE AUXILIARY FEEDWATER ty "^",c ROW RANGE LEVEL CONTROL LOGIC -

(Simplified) "

LOW LIMIT FIGURE 4 2 ^ b~~"~~AFWASY V SETPOINT r v A r /

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f A O RESET FOLLOW HOLD RAMP 24" k [ Y ""

-> T > 4- HI LIMIT 240" RCPs OFF 4 I kh ~

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! RCPs ON ACTIVATED

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TO VALVE

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SUMMARY

OF RESULTS .

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CONDITIONAL UNAVAILABILITIES OF TIIE MIDLAND AFWS v4. y y WG\*r.

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w$Q. . + Loss of Fuin Loss of ebin Loss of Pbin Feeds #ater 4i%r g Feedwater Feedwater Due to Loss and Loss of All AC Power 1.q chN of offsate Power contributors to

1. 6 unavailability

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M] 't NX %.7 Double Crossover Douole Double Crossover Double Double Crossover Double (Plant Crossover (Plant Crossover (Plant Crossover

' '.d5A7.T Specific (NHC Data) ecific (NHC Data) Specific 2

Data) Sp'Da t a) (NHC Data)

$@2yi .

Data) e3(

'$<jh Handom failures 7.0 E-5 3.5 E-5 6.6 E-4 2.5 E-4 1.7 C-2 id (1.1 E-8) 6.4 E-3 L. (8.4 E-6) (5 3 E-4) g*y;j.t Test and maintenance and 1.2 E-4 6.9 E-5 3.4 E-4 2.8 E-4 gQ random system failures (3.9 E-8) .

(6.5 E-7) 5.9 E-3 (1.9 E-4) 5.9 E-3 jc,1; y ,

,qfJ lluman error (test--failure to close full flow test valve) 6.3 E-6 (1.1 E-10) 3.7 E-6 1.8 E-5 (2.0 E-9) 1.5 E-5 3.1 E-4 3.1 E-4

$4 l (5.3 E-7) k[' Al Com. ion cause (full flow 8.4 E-6 8.4 E-6 8.4 E-6 8.4 E-6 8.4 E-6 8.4 E-6

N

.d5 dl test valve open after test) (5.9 E-10) (5.9 E-10) (5 9 E-10) f Other f f f f f f

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im -I k System Total Plean  %

kb,h Variance 2.0 4.7 E-4 E-8 1.0 6.0 E-3 E-6 2.3 6.7 E-2 E-4

." 5th

,q[Q 7,e 95th 3.4 5.8 E-5 E-4 4.1 3.8 E-5 E-3 3.5 E-3 Q

obdian 6.8 E-2

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gQr i 1.4 E-4 1.2 E-4 4.0 E-4 5 5 E-4 1.6 E-2 1.3 E-2 N J dL 4 ;

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W hjU. h RESULTS OF EVENT TR EE ANAL.YSIS -

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!FiU. Eh FREQUENCY

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FOLLOWING F 9, SYSTEM STATE A

,wu i {.{ a DEMAND

.-q INN!l m 1. IMMEDIATE FAILURE 4 X 10-5

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2. INITIAL COOLING, LONG-TERM FAILURE fLt 1 X 10'5

.v.,x.;.q, y j.thp;l 3. SUCCESSFUL OPERATION BUT 2 X 10'4

3

.,- fjE OVERCOOLING IN AT LEAST ONE SG p'h}h!O1 l.. ,:if' 4. INITIAL OVERCOOLING AND LONG-TERM 2 X 10'9

./j.$. FAILURE e;.::, -

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E.',. _,s', y 52 Pickard, Lowe and Garrick, Inc.

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