ML19322D627
| ML19322D627 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/21/1979 |
| From: | METROPOLITAN EDISON CO. |
| To: | METROPOLITAN EDISON CO. |
| References | |
| TASK-TF, TASK-TMR NUDOCS 8002180050 | |
| Download: ML19322D627 (6) | |
Text
._
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w WWW f/s.//29 CRITERIA FOR SECURING HIGH PRESSURE INJECTION
_ FLOW FOLLOWING AUTOMATIC ACTUATION OF ESAS t
CASE ONE:
LOCA CONDITIONS ( Ac' 3 Mu s 7 /3 r m# Pne,,e re J ee ve,~,.)
A.
On Low Pressure Injection B.
Greater Than 1,000 GPM LPI Flow C.
Stable for Greater Than 20 Minutes CASE IWO:
COLD LEG BREAK ON RCP DISCHARGE A.
Greater Than 20 Minutes CASE THREE: NO HEAT SINK (Act g ar e g as - pe
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A.
RCS is 50 F Subcooled B.
RCP's Running 1/1 Configuration C.
Heatsink is Available D.
RC Pressure is Being Maintained E.
Pressurizer Level is Increasing YO W UMI T.T f/
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OPERATOR EXAMINATIONS A.
Principles of Reactor Operation B.
Features of Facility Design C.
General Doerating Characteristics D.
Instruments and Controls E.
Safety and Emergency Systems F.
Standard and-Emergency Operating Procedures G.
Radiation Control and Safety H.
Reactor Theory I.
Radioactive Material Handling, Disposal & Hazards J.
Specific Operating Characteristics K.
Fuel Handling and Core Parameters L.
Administrative Procedures, Conditions & Limitations f
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l OUTLINE OF B&W TRANSIENT TAPE ON THE TMI INCIDENT FINAL
SUMMARY
A.
Follow procedures, even in multiple casualty conditions.
B.
Allow the automatic systems to perform as designed.
C.
Pressurizer level is not always a reliable indication of primary system fluid condition. Remember: We just saw pressurizer level going up while pressure went down.
D.
Core safety can be assured only if the core is being cooled, and this recuires water and water flow. Af ter a trip the primary system must be subcooled, a heat sink must be provided.
E.
Keep the high pressure injection operating until a subcooled condition erists.
Only when the primary is subcooled, is filling the pressurizer above the level of indication a serious condition.
F.
If the steam generators cannot be used as a heat sink, the core must be cooled by high pressure in.iection, and forcing the relief valves open.
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2202-1.3 Revision 8
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05/12/78
- ,1,1 MU-V17 will open to compensate for reduced pressurizer level.
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2.1.2 Additional pressurizer heaters will come on in response to i
reduced reactor coolant pressure.
2.2 Manual Action 2.2.1 Varify MU-V17 open and pressurizer heaters on.
2.2.2 "CLOSE" MU-V376 letdown isolation valve, & " START" the backup MU pump, if required.
2.2.3 Reduce load at 10% minute & proceed with normal shutdown.
2.2.4 "LINE-UP" waste transfer pump from a R.C. Bleed Holdup Tank &
pump to the makeup tank to maintain required level.
2.2.5 If for any reason the operator cannot maintain Make-up Tank and Pressurizer levels above their respective low level alarm setpoints, " TRIP" the reactor, " INITIATE" Safety Injection manua11y (push buttons on panel 3), & then "Close" MU-V12.
3.0 FOLLOW UP ACTION 3.1 Safety Injection Not Initiated.
3.1.1 Initiate unit shutdown & cooldown per 2102-3.1 and 2102-3.2 res:ectively.
3.2 :.afety injection Manually Initiated (HPI and LPI).
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Veri fy tnc.' the Makeup Pumps & Decay Heat Removal Pumps start s3-isfactorily.
3.2.1.1 Clo.e MU-V12 and MU-V18.
3.2.2 Bypass the SAFETY INJECTION by DEPRESSING the Group Reset Pushbuttons & " THROTTLE" MU-V16A/B/C/D as necessary to maintain 220" pressurizer level and not exceed 250 GPM/HPI flow leg.
3.2.3 If MU pump flow drops below 95 GpM, trip excess MU pumps.
2.0 n
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.".. 1202-6 3/13/74 Revision 1 2.
Close MU-V3, letdown isolation valve, & start additional MU pump (normally MU-PlA)
ReV-1 3.
F. educe load at 10%/ minute & proceed with normal shutdown.
4.
Line up a waste transfer pump to the "B" R. C. Bleed Tank
& pd.ap to the makeup tank to maintain reovired level.
5.
If for any reason, the coerator cannot maintain make-uo tank and pressurizer levels above their rescective low level alarm setooints, trip the reactor, initiate hi pressure injection Rev.1 manually, & then close MU-V12.
6.3 Follow Up Action (Leak within system capability)
A.
Hi Pressure Injection Not Initiated 1.
Initiate plant shutdown & cooldown per OP-1102-10.
B.
Hi Pressure Injection Manually Initiated 1.
Verify that the makeup pumps & decay heat removal pumps start satisfactorily.
2.
Bypass the E.S. signal, & throttle MU-V16A/8/C/D as necessary 1 to maintain 220" pressurizer level and not exceed 250 GPM/HP1 flow leg.
Rev. 1 3.
When MU pump flow drops below 80 GPM, as a result of throttling MU-V16A/B/C/D open MU-V36&37 to provide MU pump recirculation path to MU tank.
NOTE: RCS Loop A MU pump flow isthe sum of MU23 FEl&2. RCS Loop B MU pump flow is the sum of MU23 FE3&4.
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