ML19253A462

Forwards Current Approved Version of Base Plan for Cooldown & Depressurization of TMI-2

ML19253A462
Person / Time
Site:	Crane
Issue date:	04/07/1979
From:	Arnold R GENERAL PUBLIC UTILITIES CORP.
To:	GENERAL PUBLIC UTILITIES CORP.
References
NUDOCS 7909100066
Download: ML19253A462 (6)

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April 7,1979 To:

DISTRIBUTION From:

R. C. ARNOLD Attached is the current approved version of the Base Plan for cooldown and depressurization of it11-2.

R. C. ARNOLD

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4/6/79 BASE CASE

SUMMARY

0800 hrs.

C B

1000 --- --Gi

'D4 GA

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RC v

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A' press.

sr (psi)

(0 0 RC temp. (OF) 280 1.

Degas at A; lower pressure (A-96 A') while degassing, then return to A.

2.

Continue design / installation of static and active systems for primary makeup / pressure control and secondary cooling system for "B" S/G.

3.

Reduce temperature (A->B) by steaming on "A" S/G.

4 Take "A" S/G solid - drop primary temp. to minimum (B 46 C).

5.

Trip RC pump "A" - establish natural convection - establish cooling to >

"B" S/G if available.

6.

Drop primary pressure to selected value (C-+D).

7.

Take prinary system solid - contrcl 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 tern heat pump system

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TIME PREPARATION DEGAS MODE A. PLANT STATUS 1.

RX COOLANT PUMP, LOOP A RUNNING 2.

RX PRESSURE - 1000 PSI 3.

T AVE - 280^ F 4.

PRESSURE CONTROL IN PRZR 5.

S/G A STEAMING - LEVEL 95%

6.

S/G B ISOLATED ON SECONDARY LEVEL 95%

7.

CORE FLOOD TANKS ISOLATED B. ACTIVITIES 1.

RAISE SG LEVEL TO 95% OF OPERATING BAND 1.

FEED GENERATORS By MAIN FEED N0ZZLE VI A 2.

INSTALL PRESSURIZER LEVEL INSTRUMENT STARTUP CONTROL VALVES 3.

INSTALL RC PRESSURE INSTRUMENT 2.

MAXIMIZE LETDOWN FLOW TO IMPROVE DEGAS 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 hER B&W REQUEST MEASUREMENT 6.

SET UP B S/G SECONDARY FOR SOLID OPERATION 5.

DEFINE ENDPOINT FOR DEGAS MODE AND CONTINUE 7.

PROCEDURE FOR ESTABLISHING AND OPERATING AB0VE STEPS UNTIL THAT ENDP0 INT IS SOLID SECONDARY REACHED 8.

LESIGN LONG TERM CLOSED llEAT EXCHAflGD1 6.

LOWER PRESSURE PROGRESSIVELY WITH PUMPS SYS!EM FOR SECONDARY SOLID PLANT OPERATION RuttNING TO EXPEL GAS FROM CRDM'S 9.

DETERMIfd BEST CONDITIONS FOR CORE 7.

CHECK INTEGRITY OF B STEAM GENERATOR FLOOD TANKS FOR EACH PHASE 10.

PLAN HOW TO MAINTAIN PRIMARY BORON g

CONCENTRATION Cd y, ;.

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1 PHASE II PHASE III I

'r TRANSITION TO NATURAL CIRCULATI0fl MODE ULTIMATE PASSIVE MODE 1.

DEGASSED SYSTEM AND VERIFIED P 50 PSI 1.

NAT CIRC FLOW ESTABLISHED IN A LOOP 2.

LOOP A RCP C"NNING H

2.

PRESSilRE ABOUT 100 PSI 3.

COOLANT PRESSURE ABOUT 1000 PSI Oil PRZR 3.

TiiE PRESSURE ltAKE-UP CONTROL lilTH NEW 4.

COOLANT TEMP. = 2800F EXTERNAL SYSTEM 5.

A S/G AT 95% AND STEAMING

4. MAIN CONDENSER HEAT SINK 6.

B S/G AT 95% - ISOLATED 04 SECONDARY SIDE 7.

NEW PRIMARY M/U SYSTEM IS IllSTALLED AND GPERATIONAL 8.

CORE FLOOD TANK PRESSURIZED BUT ISOLATION VALVES CLOSED 1.

ESTABLISH ALL LIQUID COOLING - LOOP A EARLY OPERATION (SECONDARY PRESSURE PRIMARY) 1.

MAINTAIN NAT CIRC IN PRIM, SOLD OPERATION 3

R AR C LANT TEMPERATURE AS LOW TD1 AS POSSIBLE 4.

HOLD PRESSURE AT ABOUT 1000 PSI 'ilTH ULTIMATE OPERATION PRESSURIZER

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1.

INSTALL AND MERATE PASSIVE PRTIARY MAKE-5.

TRIP REACTOR COOLANT PUMP "A" UP SYSTEll 6.

ACTIVATE "B" LOOP (IF AVAILABLE) 2.

LOWER PRESSURE TO LONG TERT 1 OPTIt10tl WITH LIQUID CLOSED COOLING SYSTEll ABOUT 10-50 PSI) 7.

It0NITOR CORE T/C'S FOR VERIFICATION OF 3.

INSTALL ALTERNATE SECONDARY SIDE FLOW PATH NATURAL CIRCULATION TO ELIMINATE CONDENSER AS HEAT SINK 8.

MONITOR S/G

'S TO ASSURE CONVECTION IN A S/G 9.

DEPRESSURIZE CORE FLOOD TANKS (SUBJECT TO SAFETY REVIEW)

C

10. LOWER SYSTEM PRESSURE TO ABOUT FINAL CHOSEN G

PRESSURE (

100 PSI) b.

11. TAKE PRIMARY SYSTEM SOLID h 12 CONTROL MAKEUP AND PRESSURE WITH NEll PRIMARY g

MAKE-UP SYSTEM

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C. CONCERNS 2.

A. POTENTIAL INTERFERENCE WITH St.HPLING 2.

A. ANY BLOCKAGE 3.

A. POTENTI AL INTERFERNECE WITH SAMPLING B. SYSTEM LINEUP 4.

A. OBTAIN EQUIPMENT C. OPTIMUM CONDITIONS IN M/0 TANK?

NOTE: Nunbers B. RELIABLE POWER SUPPLY 3.

A. MORE MCP'S?

are keyed to C.

CONNECTING TO CONTAMINATED SYSTEM MAXIMIZE HEATERS activities D.

WATER SUPPLY OPTIMUM PRZR & PLANT CONDITIONS?

above.

E.

CAPABILITY TO ADD BORIC ACID

4..

A. METHODOLOGY UNKNOWN 6.

A.

CAN LOOP BE USED MEASUREHENT DIFFICULT B.

WATER HAMt1ER PROBLEMS DURING

5..

A. NEED TEMP. PRESSURE, TRANSITION FROM STEAMING TO SOLID GAS CONTENT OPERATION 6.

A. NEED LOWER LIMIT OF PRESSURE C.

OPTIMUM FEED PATH 7 B. NEED METHODS OF CHECKING BUBBLE D.

SHOULD SECONDARY SIDE BE BORATED FORMATION VOLUME.

E.

S/G STABILITY AT LOW FLOW C. NEED TO DEFINE HOLD TIME AT EACH

8. A.

ONE S/G (A) OR 30TH A & B PRESSURE STEP.

B.

EQUIPMENT AVAIL /BLE C.

SOURCE OF HTXR C0OLING WATER 7.

A. AVOID SPREAD 0F CONTAHINATION D.

SYSTEM RELIABILITY B. MINIMIZE RELEASE Of RADI0 ACTIVITY

9. A.

POTENTIAL NON-CONLENSIBLE GAS SOURCE B.

VENT VALVE OPERABILITY C.

NEED FOR COOLING WATER SOURCE 10.

A.

NEED PRIMARY SYSTEM BORON ANALYSIS; DIFFICULT TO SAMPLE B.

BORON ADDITION CAPABILITY C.

BORON INVENTORY CONTROL D.

CONTINGENCY

1. LOSS OF INSTRUMENTS g 1.

EMERGENCY TRANSITION TO NATURAL CIRCULATION PLANS

2. LOSS OF MAJOR EQUIPMENT ON LOSS OF ALL MCP'S (MCP'S., COND. PUMP,)

2.

LOSS OF MCP 1A (REVISION HAY BE REQUIRED) 3.

INADVERTANT DEPRESSURIZATION.

4.

INABILITY TO DEGAS.

5.

LOSS OF INSTRUMENTS 6.

LOSS OF OTHER VITAL EQUIPMENT (SPRAY VALVE, VENT VALVE, PRZR HEATERS, CO ETC).

C9 7.

LOSS OF MAKEUP CAPABILITY

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LOSS OF ELECTRICAL POWER.

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A. PROPER FEED LOCATION E. DEGASSED WATER EARLY OPERATION B. OFFSITE POWER F. SG CollTROL/

1.

A. EQUIPMENT RELI ABILITV-~

C. CONTAMINATION STABILITY 2.

A. C0tlTAMINATION/ MAINTENANCE OF SYSTEM D. WATER HAMMER G. NEED BORATED WATER B. SURGE OR TRANSIENTS IN SECONDARY OR BOR0tl SAMPLING METil0D

2. A. NO REDUNDANCY IN COOLING, SLIGilT PENALTY IN HAT CIRC ULTIMATE OPERATI0tl B. CONTAMINATION C. SG CONTROL / STABILITY 1.

A. DESIGN CDIffEPT NOT DETERTffNED

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5. A. NAT CIRC DOESN'T START 2.

A. WHAT IS LONG TERM OPTIMUM PRESSURE B. POTENTIAL IrlABILITY TO RESTART B. BORON CONTROL AtlD PRECIPITATION

6. A. WHICH INSTRUMENTS TO MONITOR C. CONTAINMENT LIQUID INVENTORY CONTROL B.

CRITERIA FOR "NAT CIRC NOT ACHIEVED" D. I,NTEGRITY OF PRIMARY LO^P

7. A. AVAILABILITY OF INSTRUMENTS E. L0tlG TERM RADI0 LYSIS

8. A. VENT VALVE RELIABILITY

9. OPTI!1 tift FIllAL PRESSURE 7

10. A. EXCESS LEAKAGE B. POTENTIAL VALVE FAILURES

11. POTENTIAL CONTAMINATION OF NEW FEED SYSTEM

1. LOSS OF t1AKEUP CAPABILITY 1.

LOSS OF NATURAL CIRCULATION

2. LOSS OF INSTRUMENTS 2.

LOSS OF SECONDARY COOLING

3. LOSS OF VITAL COMPONENTS 3.

LOSS OF PRESSURE CONTROL

4. EMERGENCY TRANSIT 10fl TO NATURAL CIRCllLATION

5. LOSS OF NATURAL CIRCULATION

6. LOSS OF PRESSURE CONTROL

7. HPCI ONCE THROUGH C00LIflG

8. DECAY HEAT REMOVAL

9. LOSS OF HEAT REMOVAL CAPABILITY

10. LOSS OF ELECTRICAL POWER 7

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