ML20009D184

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Cooldown Emergency Procedure.
ML20009D184
Person / Time
Site: Shoreham File:Long Island Lighting Company icon.png
Issue date: 07/09/1981
From:
LONG ISLAND LIGHTING CO.
To:
Shared Package
ML20009D181 List:
References
29.023.02-DRFT, NUDOCS 8107230261
Download: ML20009D184 (8)


Text

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SP Number 29.923.02

. .Subnitted:

Epproved: Revision C Flant Manager Effective Date tt c -""

EMERGENCY PROCEDURE dh' ?"h l

.1.9 PURPOSE The purpose of this procedure is to depressurize and cooldown the RPV to cold shutdown conditions while maintaining RPV water level within : satisfactory range.

'2.9 ENTRY CONDITIONS This procedure is entered from SP 23.923 91 (Level Control) after the RPV water level has been stabilized.

}$ 3 9 . OPERATOR ACTIONS

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CAUTION If a high drysell pressure ECCS initiation signal occurs or exists while de?ressurizing, prevent injection.from those CS and LPCI pumps not required to assure adequate core cooling prior to reaching their maximum injection pressures.

When the high drywell pressure ECCS initiation signal clears, restore CS and i.PCI to AUTOMATIC / STANDBY mode.

CAUTION Do not secure or place an ECCS in MANUAL mode unless, by at le..e two independent

, indications, (1) misoperation in AUTOMATIC mode is confirmed, or (2) adequate core cooling is assured. If an ECCS is placed in MANUAL node, it will not initiate automatically. .Make frequent checks of the initiating or controlling parameter. ' When annual operation is no longer required, restore the system to Automatic / Standby Mode if possible.

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L3.1 Maintain RPV water laval betwaan +6" en Fual Zens Indicator end +58.75" with cne or more of tha following systens:

3.1.1 Condensate /Feedwater 1115 to 9 psig 3.1.2 CRD 1115 to 9 psig CAUILON Do not throttle HPCI or RCIC systems below the minimum speed of 2159 RPM.

g '3.1.3 RCIC 1115 to 59 psig

c. 3.1.4 HPCI 1115 to 199 psig 3.1.5 C.S. 333 to 9 psig 13 .1.6 LPCI 238 to 9 psig CAUTION If signals of high suppression pool water level (26'11") or low condensate storage tank water level (3'4") occur, confirm automatic transfer of /or manually transfer HPCI and RCIC suction from the condensate " tank to the i suppression pool.

i 3.1.7 If any of the following limits are er.ceeded, proceed

. to'.SP 29 923.93 (Containment Control) and perform L it concurrently with this procedure.

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s. Drywell pressure above +1.69 psig i :b. Drywell ~ temperature above 135'F r
c. = Suppression Pool temperature above 99*F L d. Suppression Pool level above 26'8"
e. Suppression Pool level below 26'9" l^

igg -- 3.2 If RPV water level cannot be determined or maintained above I"r ' TAF, enter SP 29 923 94 (Level Restoration).

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1. TAF = +6" as read on fuel zone' instrumentation:

SP 29 923.92 Rev. C Page 2 g

' . , 3.3 If SRV'c crs cycling, manually cpan ena SRV snd r:duca RPV prssgure to b2tw2cn 790 psig cnd 960 psig to ninimiza SRV cycling (alternate SRV's to equalize suppression pool heating if this step must be repeated using Figure 1 as a guide.)

3.4 Depressurite the RPV and maintain cooldown rate below 19@'F/hr per SP 22 9@5.91, Shutdown to Cold Shutdown concurrently with this procedu"e.

3.4.1 Pressure reduction may be augmented with one or more of the following systems.

CAUTION Cooldown rates greater than 199'F/hr may be required to conserve RPV water inventory, protect primary containment integrity, or limit radioactive release to the environment.

CAUTION Do'not depressurize the RPV below 199 psig unless motor driven pump sufficient to maintain RPV water level are

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running and available for injection.

3.4.2 Use one or more of the following systems:

(A) Main Condenser available (1) Main Turbine Bypass Valves (preferred asth'od) per SP 22 905.91, Shutdown to Cold Shutdown

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(2) RCIC per SP 23.119 91, Reactor Core Isolation Cooling (RCIC) System (3) HPCI per SP 23.292 91, High Pres 9ure Coolant Inja.ction (4) RHR (Steam Condensing Mode) per SP 23.121.91, Residual Heat Removal (RRR)

System l~ (5) Other Steam Driven Equipment (1) Steam Jet Air Ejectors per SP 23.791.91, Condenser Off-Gas Removal L

SP 29.923 92 Rev. C Pags 3 t.

  • (2) 'RFPTS par SP 23.199.91, Fetdwater Systes (3) Steam Seal Evaporator per SP 23.124.91, Steam Sealing (4) Main Condense- Deaerating Steam per SP 22.193.91, Condensate (5) RWCU (Recirculation Mode) per SP 23.799 91, Reactor Water ,leanup System (6) Main Steam Line Drains per EP 23.116.91, Main and Auxiliary Steam (7) RWCU (Blowdown Mode) per SP 23.791 91, Reactor Water Cleanup System

~(B) Main Condenser not available (1) RCIC per SP 23.119 91, Reactor Core Isolation Cooling (RCIC) System (2) HPCI per SP 23.292.91, High Pressure ~.

Coolant Injection (3) RHR (Steam Condensing Mode) per SP 23.121 91, Residual Heat Removal (RER)

System (4) RWCU (Recirculation Mode) per SP 23.799 91, Pesctor Water Cleanup System (5) SRV's .

(1) Open relief valves using Figure 1 as a guide to equalize suppression pool heating L

(2) Fewer blowdowns with increased l pressure reductions are desirable to l- minimize SRV cycle stresses.

j-(3) If'the 20atinuous SRV pneumatic supply is or becomes unavailable, l: depressurize with sustained SRV

! opening.

(6) RWCU (Blowdown Mode) per SP 23.799.91, Re. actor Water Cleanup.

SP 25.923.92 Rev. C Page 4

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  • l 3.5 Wh n th2 RHR chutdown cooling interlecko clast, initista the shutdown cooling modi of RRR par SP 23.121 91, Resid:.al Hast u Removal (RHR) System.

t 3.6 If the RHR shutdown cooling mode cannot be established and furt"ser cooldown is required, continue to cooldown with the systems listed in substep 3.4.2(A) or 3.4.2(B) as

, f f+ < applicable.

4" 3.7 If'RPV cooldown is required bst cannot be accomplished, perform the following.

3.8 Initiate Suppression Pool Cooling per SP 23.121 91, Residu.sl Heat Removal (RHR) System.

3.9 ~Close the following valves:

Q (A) RPV Head Vents 1B21 MOV-984 1821 MOV-985 (B) All MSlV's 1B21 A0V-981A IB21 A0V-982A 1821 A0V-981B 1B21 A0V-982B ,

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1B21 A0V-981C 1821 A0V-982C

-1521 A0V-981D 1B21 A0V-982D _ , _

_(C) MSL Drain Lines 1B21 MOV-938 IB21 MOV-933 1B21 A0V-988 1821 A0V-989 (D) RHR Steam Condensing Valve IE11 MOV-949 3.19 Position SRV'siso that only one SRV is open.

3.11 Maintain RPV water level less than 58.75" until RPV pressure is less than (later) psig by use of HPCI and RCIC.

SP 29.923 92 Rev. C Page 5

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3.12 Wh n PRV w:tsr 1sval exeseds 58.75".

.(A) CLOSE the following HPCI isolation valves:

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'1E41-MOV-941 1E41 MOV-942 1E41 MOV-947- 1E41 MOV-948 k (B) ~ CLOSE the following RCIC isolation valves:

D .-1E51 MOV-941 1E51 MOV-942 1E51 MOV-947' 1E51 MOV-948 3.13. Start one CS or LPCI pump 'with suction from the suppression ,

pool.

3.14 Slowly raise RPV water level while maintaining less than 199'F/hr cooldown rate, to establish a flow path through the 1 open SRV back to the suppression pool.

3.15' Slowly _ increase CS or LPCI flow to' establish a 199'F/hr cooldown rate. [

3.16 IF necessary, increase CS or LPCI flow to the maximum single ~

pump flow for the pressure at which RPV pressure stabilizes. .

3.17 IF RPV pressure.does not stabilize ABOVE (later) psig, start another pump.

3.18 IF RPV ' pressure does not stabilize BELOW (later) psig, open additional SRV's located symetrically about the suppassisn pool.

CAUTION ,

i CONTROL SUPPRESSION POOL TEMPERATURE TO MAINTAIN RPV WATER TEMPERATURE ABOVE 79'F_PER SP 23.121.91, RESIDUAL HEAT REMOVAL (RER) SYSTEM.

! 3.19 'When RPV cooldown is under control and plant conditions are l* stable, proceed to cold shutdown in accordance with SP 22.995.91, Shutdown to Cold Shutdown.

SP 29 923.92 Rev. C Page 6-i

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4.9 REFERENCES

4.1 SP 29 923 91 - Level Control 4.2 SP 29 923.94 - Level Restoration

.4.3 SP 22.995.91 - Shutdown to Cold Shutdown 4.4 SP 23.119.91 - Reactor Core Isolation Cooling (RCIC) System 4.5 SP 23.292 91 - High Pressure Coolant Injection 4.6 SP 23.121 91 - Residual Heat Removal (RHR) System 4.7 SP 23.791 01 - Condenser Off Gas Removal 4.8 SP 23.124.91 - Steam Sealing 4.9 SP 23.193.91 - Condensate 4.19 SP 23.199.91 - Feedwater System "4.11 SP 23.799 91 - Reactor Water Cleanup System 4.12' SP 23.293 91 - Core Spray System 4.13 SP 23.294.01 - Low Pressure Co.olant Injection SP 29.923.92 Rev. C Page 7

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+RV-093F 1Z93TE113Z 1Z93TE110Y-3 +RV-0936 1Z93TE113X 1293TE110X-4 1Z93TE113Y 1Z93TE110Z-5 l

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+RV-093J 1Z93TE134B 1C61TE022B-1 +RV-093A 1Z93TE1122 1Z93TE133A-2 1Z93TE112X 1Z93TE111W-3 IZ93TE112Y' 1Z93TE111Y-4 -

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-1Z93TE134A 1Z93TE111Z-6 1Z93TE133B-7 +RV-093B

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+RV-093K +RV-093E FIGURE 1 SP 29 923 92 Rev. C Page 8

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