ML19221A166
| ML19221A166 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 04/07/1979 |
| From: | Arnold R Metropolitan Edison Co |
| To: | |
| References | |
| NUDOCS 7905190227 | |
| Download: ML19221A166 (6) | |
Text
,
2-April 7, 1979 To:
DISTRIBUTION Fron:
R. C. ARNOLD Attached is the current approved version of the Base Plan for cooldown and depressurization of Tf11-2.
R. C. ARNOLD 3,
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C B
1000 - - - - - -G '
Cd GA l.
RC y
- press, sr V'
A' (psi)
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i RC terp. (OF) 280 1.
Degas at A; lower pressure ( A,* A') while degassing, then return to A.
2.
Continue design / installation of static and active systems for prinary makeup / pressure control and secondary cooling system for "B" S/G.
3.
Reduce temperature (A >S) by steaming on "A" S/G.
4.
Take "A" S/G solid - drop primary temp. to minimum (B -> C).
5.
Trip RC pump "A"
- establish natural cenvection - establish cooling to e "S" S/G if available.
6.
Drop primary pressure to selected value (C --*D).
7.
Take primary system solid - control pressure and makeup with static or new active system.
END POINT Primary - natural circ., solid liquid, long term P/V control Secondary - solid water, long term heat puno system 136 085
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TIME PREPARATION DEGAS MODE A. PLANT STATUS
/
1.
RX COOLANT PUMP, LOOP A RUNNING 2.
RX PRESSURE - 1000 PSI
'3 3.
T AVE - 280' F C}
4.
PRESSURE C0fiTROL IN PRZR 5.
S/G A STEAMING - LEVEL 95%
6.
S/G B ISOLATED Oti SECONDARY s:3 LEVEL 95%
re, 7.
CORE FLOOD TANKS ISOLATED T
x B. ACTIVITIES 1.
RAISE SG LEVEL TO 95% OF OPERATING BAND 1.
FEED GEtlERATORS By MAIN FEED N0ZZLE VI A 2.
IfiSTALL PRESSURIZER LEVEL INSTRUMEtiT STARTUP C0f4 TROL VALVES 3.
INSTALL RC PRESSURE INSTRUMENT 2.
MAXIMlZE LETDOWri FLOW TO IMPROVE DEGA5 4.
INVESTIGATE LONG TERM RC PRESSURE CONTROL 3.
MAXIMIZE SPRAY FLOW (INTERMITENT VENT)
AND MAKEUP PUMP 4.
PERFORM DISSOLVED GAS VAPOR PRESSURE 5.
HOOK UP CORE DETECTORS DER B&W REQUEST MEASUREMENT 6.
SET UP B S/G SECONDARY FOR SOLID OPERATION 5.
DEFINE EfiDPOINT FOR DEGAS MODE AND C0fiTINUE 7.
PROCEDURE FOR ESTABLISHING AND OPERATING A30VE STEPS UNTIL THAT ENDPOINT IS SOLID SECONDARY REACHED 8.
DESIGN L0t4G TERM CLOSED HEAT EXCHAttGUT 6.
LOWER PRESSURE PROGRESSIVELY WITH PUMPS SYSTEM FOR SECONDARY SOLID PLANT OPERhTI0fl Rl!f4NING TO EXPEL GAS FROM CRDM'S 9.
DETERMINd BEST CONDITIONS FOR CORE 7.
CHECK INTEGRITY OF B STEAM GENERATOR FLOOD TAfiKS FOR EACH PHASE 10.
PLAN HOW TO MAINTAIN PRIMARY BORON C0f1 CENTRATION v
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1.
A. PROPER FEED LOCATION E. DEGASSED WATER EARLY OPERATION B. OFFSITE POWER F. SG CONTROL /
1.
A. EQUIPMEfif IlELIABILIIY C. C0fiTAMINATION STABILITY 2.
A. CONTAMIflATI0fi/MAltlTEflANCE OF SYSTEft D. WATER HAMMER G. fiEED BORATED WATER B. SURGE OR TRANSIENTS
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IN SECONDARY OR
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3 BORON SAMPLING f1ETHOD IN liAT CIRC ULTIMATE OPERATION
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- 2. A. NO REDUNDANCY IN COOLING, SLIGilT PENALTY l
B. C0flTAMINATION C. SG CONTROL / STABILITY 1.
A. DESIGft CDIiCEPT NOT DETEREDIED
- 5. A. fiat CIRC DOESN'T START 2.
A. WHAT IS LONG TERM OPTIftUM PRESSURE B. POTENTIAL INABILITY TO RESTART B. BOR0fl CONTROL AND PRECIPITATION
- 6. A. WHICH IriSTRUf1ENTS TO MONITOR C. C0flTAlfif1ENT LIQUID INVENTORY CONTROL B.
CRITERIA FOR " flat CIRC NOT ACHIEVED" D. INTEGRITY OF PRIMARY LOOP.
- 7. A. AVAILABILITY OF IllSTRUMEflTS E. LONG TERM RADIOLYSIS
- 8. A. VENT VALVE RELIABILITY
- 9. OPTIrillil FI!!AL PRESSURE 7 s
- 10. A. EXCESS LEAKAGE B. POTErlTIAL VALVE FAILURES
- 11. POTENTIAL C0flTAMINATION OF NEW FEED SYSTEM
- l. LOSS OF f1AKEUP CAPABILITY 1.
LOSS OF NATURAL CIRCULATION
- 2. LOSS OF IllSTRUMENTS 2.
LOSS OF SECONDARY COOLING
- 3. LOSS OF VITAL COMPONENTS 3.
LOSS OF PRESSURE CONTROL
- 4. EMERGENCY TRANSITION T0 flATURAL CIRCULATI0fl
- 5. LOSS OF flATURAL CIRCULATION
- 6. LO55 0F PRESSURE CONTROL
- 7. HPCI ONCE THROUGH C00LIflG
- 9. LOSS OF HEAT REMOVAL CAPABILITY
- 10. LOSS OF ELECTRICAL POWER
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