ML19224B112
| ML19224B112 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/12/1978 |
| From: | Metropolitan Edison Co |
| To: | Mullinix W NRC/IE |
| References | |
| 2203-1.1, TM-0038, TM-38, NUDOCS 7906140060 | |
| Download: ML19224B112 (8) | |
Text
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TMI DOCUMENTS DOCUMENT NO:
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0F DOCUMENT PROVIDED BY COPY MADE ON
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METROPOLITAN EDISON COMPA!Pl.
Willa R. Mullinix, NRC 79.06140060 187 014 O
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CENTRAL F LE THREE MILE ISLAND NUCLEAR STATION UNIT #2 ABNORMAL PROCEDURE 2203-1.1
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LOSS OF BOR0h (MODERATOR DILUTION)
Table of Effective Pages Pace Date Revision Pace Date Revision Pace Date R evision 1.0 09/12/78 5
2.0 09/12/78 5
2.1 05/17/78 4
3.0 09/12/78 5
4.0 09/12/78 5
5.0 06/18/77 0
6.0 06/13/77 0
Unit 1 Staff Recommends Approval Unit 2 Staff Recommends pproval Approval __
N, Date Approval Date Cognizant Dept. Head Ccgnizant Dept. Head Unit 1 PORC Recomr.. ends Approval Unit 2 PORC R,ecommends Approval h
Date 7 / 72
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Date Chairman of PORC V-Chairrna., of PORC
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3 Unit 1 Superintendent Approval Unit 2 Superintendent Approval Date f E
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1 0 7, D T1 r -
Is Manager Generation Quality Assurance Approval iu TMI 55 A R ow 8/7 7 e
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2'33-1.1 APR 2 3 138; Revision 5 2
09/12/78 THREE MILE SLAND NUCLEAR STATION UNIT #2 ABNORMAL PROCEDURE 2203-1.1 LOSS OF BORON (MODERATOR DILUTION) 1.0 SYMPTOMS 1.1 Chemistry analysis indicates a decreasing boron concentration in the Reactor Coolant System.
1.2 Neutron flux levels increasing or with the control rod drive system under automatic ICS control, the control rods are inserting.
1.3 The pressurizer and/or makeup tank levels are increasing.
1.4 " Feed and Bleed Enabled" alarm is actuated (at Panel 8).
1.5 With the reactor vessel head removed, the fuel transfer canal and/or spent fuel pool water levels are increasing.
2.0 IMMEDIATE ACTION 2.1 Automatic Action None 2.2 Manual Action 2.2.1 For a case where there is a large low borated water inflow and/or the inflow is readily identified, immediately secure the appropriate pump (s) and/or valve (.s) to stop tha inflow.
i 2.2.2 Verify the proper makeup and pruification demineralizer is in i
service.
2.2.3 Commence RCS Boration to maintain Control Rod drives within i
the insertion limits if applicable.
3.0 FOLLOW UP ACTION 3.1 Initio.e a chemistry sampling program for surveillance of boron concentration in order to determine where changes have occurred.
3.1.1 For the case where the reactor vessel head is in place and normal letdown and makeup are in progress, with the DN hte(l f secured, sampling should be initiated from the following 1.0
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2203-1.1
&s Revision 5 APR 2 3 19%).
09/12/78 areas:
a.
RC System via the letdown b.
Pressurizer c.
Makeup Tank 3.1.2 For the case where the reactor vessel head is removed or in place, but only the DH System is in operation, sampling should be initiated from the RC System via the DH System.
3.1.3 The purpose of this sampling is to both aid in locating the source for the loss of boron and to gauge the rate of this loss.
3.2 Determine the amount of shutdown margin available in accordance with 2103-1.3, Reactivity Balance Calculations.
j 3.2.1 If the shutdown margin is <1% aK/K, with eff <1 or if <2%
aX/K with eff >1 immediately initiate and co uinue to emergency borate as follows until the required shutdown margin is restored.
3.2.1.1 If BAMT is T.S. source and is lined up thru MU Pumps (2301-M2 Att 2A).
a.
Start CA-P-4A or 4B b.
Open MU-V10 c.
If MU-V10 fails to open, open MU-V127.
d.
Start MU-P-1 A, B, or C if not already operating.
If thare. is a bubble in the pressurizer maintain level e.
constant by controlling RCS letdown valve MU-V376.
If the pressurizer is solid maintain RCS pressure below 500 psig using MU-V376.
f 3.2.1.2 If RBAT is T.S. so;rce and is lined up thru MU Pumps (2301-M2 Att 2B) !
a.
Open WDS-Vill b.
Start WDS-P-3 187 017
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2203-1.1 V
Revision 4 05/17/78 APR 2 3 793
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c.
Start either FA-P-4A o_r_ 4B d.
Open MU V10 e.
If MU-V10 fails to open, apen MU-V127 f.
5 tart MU-P-1 A, B or C if not 'lready operating.
g.
If there is a bubble in the pressurizer maintain level constant by controlling RCS letdown valve MU-V376.
If the pressurizer is solid maintain RCS pressure below 500 psig using MU-V376. -
l 3.2.1.3 If BWST is T.S. source and is lined up thru DHR Pumps (2301-M2 Att 3)
I 3.2.1.3.1 If DH-P-1 A is operating:
a.
Close breaker for CH-VSA at MCC 2-11 EA and open valve b.
Stop DH-P-1A i
c.
Close CH-V100A j
I d.
Open DH-V102A e.
Start DH-P-1A 3.2.1.3.2 If DH-P-1B is operating a.
Close breaker for DH-V5B at MCC2-21EA and open valve I
b.
Stop DH-P-1B c.
Close DH-V1008 d.
Open ?H-V102B e.
Start DH-P-1B 3.2.1.4 If BAMT is T.S. source and is lined up thru MU Pump Bypass (2301-M2 attach 4A) a.
Start either CA-P-4A or 4B b.
Open MU-V10.
If MU-V10 fails to open, open MU-V127.
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2203-1.1 Revision 5 APR g 3 g 09/12/78 3.2.1.5 If RBAT is T.S. source and is lined up thru MU Pump Bypass
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(2301-M2 Att 48) a.
Open WDS-Vlli b.
Start WDS-P-3A c.
Start CA-P-4A or 4B d.
Open MU-V10.
If MU-V10 fails to open, open MU-V127.
3.3 Maintain the RC System boron concentration as directed by the Shift Supervisor / Shift Foreman in accordance with 2103-1.2, Soluble Poison Concentration Control.
3.4 If the cause of the loss of baron (moderator dilution) is still not known, refer to the below listed enclosures for guidance on locating the possible cause.
3.4.1 Loss of Baron Checklist (RV Head in Place with Makeup System Operational and DH System secured.
3.4.2 Loss of Boron Checklist (RV Head Removed or In Place but only DH System in operation).
3.5 Initiate the appropriate action to eliminate the problem.
3.6 When the loss of boron (moderator dilution) has been stopped, cease the sampling program initiated in Step A above and return the systems to their normal conditions for the mode of operation which the unit is in.
3.7 Determine the shutdown margin available in accordance with 2103-2 1.9, Reactivity Balance Calculations.
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Revision 5 3 579 09/12/78 - Loss o? Baron Checklist (RV Head in Place With Mikeup System Operational and DH System Sea! red)
Possible Cause Corrective Action 1.
The Makeup System is introducing 1.
Close, or verify closed, MU-V10 a fluid of lower boron concen-(Boric Acid & DW Addition tration into RC System.
Isolation Valve) MU-V294, (DW Addition Isolation Valve)'and MU-V293 (MU Pump DW Suction Isolation).
2.
If a batch deboration process is 2.
Close, or verify closed, MU-V10, or was in progress, ft. lure of (Boric Acid & DW Addition valves MU-V10, (Boric Acid & DW Isolation Valve) and MU-V294, (DW Addition Isolation Valve) and Addition Isolation Valve).
MU-V294, (DW Addition Isolation Use manual verification if Valve), to close tight could necessary.
cause a deboration of RC System.
3.
If a mixed flow batch )rocess is 3.
Check for level decrease in RBAT or was in progress, freezing or BAMT. Check the heat.. acing of the boric acid addition line on the boric acid addition line could cause a diluent to flow tu verify operation.
Close, or into the RC System.
verify closed, MU-V10, Boric Acid
& 0W Addition Isolation Valve.
If required, use alternate boric acid addition line for any further bora tio::.
4.
If a feed and bleed deboration 4.
Close, or verify closed, MU-V10, process is or was in progress, Boric Acid & DW Addition Isolation failura of valves MU-V10, (Boric Valve and MU-V294, DW Addition Acid & DW Addition Isaiation Isolation Valve.
Use manual Valve) and MU-V294, (DW Addi-verification if necessary.
tion Isolation Valve), to close tight could cause further RC System deboration.
5.
If a feed and bleed mixed flow 5.
Check for level decrease in process is or was in progress, R8AT or BAMT.
Check the heat freezing o? the boric acid tracing on the boric acid addition addition line could cause a line to verify operation.
Cl os e,
diluent to flow into the RC or verify closed, MU-V10 Boric System.
Acid & DW Addition Isolation Valve.
If required, use alternate boric acid addition line i
for any further boration.
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2203-1.1 APR 2 3 3p9 Revision 0 06/18/77
- - continued Possible Cause Corrective Action 6.
If a flow path is inadvertently 6.
Close, or verify closed, MU-V10, lined up to the debo: ating (Boric Acid & DW Addition Isolation demineral.er(s), boron concen-Valve) and WDL-V45 (Deborating tration could drop until Demineralizers Inlet Valve).
If saturation is attained.
required, also close deborating demineralizer isolation valves WDL-V81A/B and WDL-Vil8A/B.
7.
Other means of diluents enter.
7.
Close, or verify closed, ing the RC System are through MU-V285A/B, (Makeup & Puri fica-the following MU System valves:
tion Demineralizers N,/DW Supply MU-V285A/B (Makeup & Purifica-vaives) and MU-V292A/B, (Makeup tion Demineralizers Np/CW
& Purification Demineralizers Supply Valves) MU-V292A/B Backflush Valves).
If required, (Makeup & Purification remove spool piece from Demineralizers DW Backflush demineralized water supply line Valves).
to Makeup & Purification Demineralizers (MU-KlA/B).
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APR 2 3 3 79 -
Revision 0 06/18/77 - Loss of Boron Checklist (RV Head is Removed, or in Place but Only the DH System is in Operation)
Possible Cause Corrective Action 1.
Decay Heat Pump (s) (DH-P-1A/B) 1.
Cease suction from these sources taking suction from the as follows:
following sources which may have lower boron concentra-tions than the RC System:
a) from SF Cooling System a)
Close, or verify closed, valves DH-V110 and DH-V101A/B, DH Suction from SF System Valves (Manual Valves) b)
frcm SF Cooling System b)
Close, or verify closed, valves purification SF-V107 and SF-V125, SF Cooling &
Purification Loops Isolation Valves. Also verify that the demineralized water supply to the SF Demineralizer (SF-Kl) is secured by verifying closed SF-Vl86, SF Demineralizer N /DW Supply Valve.
If required,2secure the SF purification loop and isolate from the DH System by closing SF-V122, SF Purification to DH System Isolation Valve.
c) from NaOH Storage Tank c)
Close, or verify closed, valve-DH-V8A/B, NaOH Storage Tank Isolation Valves.
If this is considered to be the source for boron dilution, also consult chemistry department as to effects of Na0H in RC System.
2.
During refueling when the 2.
Verify that SF Pcol and Fuel Transfer transfer tubes are open, the Canal water levels are the same and possible inflow of lower baron check for possible flow through the concentration SF Pool water into transfer tube from the SF Pool to the the Fuel Transfer Canal could Fuel Transfer Canal. Adjust system cause RC System baron dilution.
flow as necessary and close FH-Vl A/B, Transfer Tube Isolation Valves, if required while corrective action is underway.
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