ML20008F627

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Emergency Proceducooldown
ML20008F627
Person / Time
Site: Grand Gulf  Entergy icon.png
Issue date: 04/15/1981
From:
MISSISSIPPI POWER & LIGHT CO.
To:
Shared Package
ML20003F494 List:
References
05-S-01-EP-2, 5-S-1-EP-2, NUDOCS 8104210403
Download: ML20008F627 (9)
v • d • e


Text

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EMERGENCY PROCEDURE 3EA.,ND GULF NUCLEAR STATION G

PLANT OPERATICNS MANUAL Volume 5 0 5-S-01-EP-2 Sec'tien 1 Revision C Date:

EMERGENCY PROCEDURE COOLDOWN SAFETY RELATED Date Prepared:

Reviewed:

Date Technical Review Date Reviewed':

Cperat:.cns Superintendent Date Reviewed:

Nuclear Plant Quality Superintendent Approved:

Date Assistant Plant Manager PSRC:

Date I

i

)

l List of Effective Pages:

Pace:

Revisien:

1-7 Rev.

'C Attachment I Rev.

C 810.4210409

GP.AND GULF NUCLEAR STATICM EMERGENCY PRCCEDURE i_

TITLE: Cooldown NO. 0 5-S-01-EP-2 REV. O PAGE1 of 1.0 PURPOSE

.The purpose of this procedure is to depressurize and cooldown the RPV to cold shutdown conditions while maintaining RPV water level within a satisf actory range.

2.0 ENTRY CONDITIONS This procedure is entered frcm EP-1 (Level Control) after the RPV water level has been stabilized.

3.0 OPERATOR ACTIONS

' CAUTION A LPCS and LPCI injection resulting from a A1.75 psig Drywell pressure signal will inject a large volume of water into the RPV when RPV pressure decreases to the LPCS and LPCI pump injection pressures.

Rapid injection of this large volume of water may be detri-mental to maintaining RPV water level within the desired range.

' NOTE r

I SOI numbers acd available pressure ranges are indicated for each system, sNOTE i

The systems listed in paragraph 3.1 are listed in. order i

of expected availability and ease of utilization. ' The choice of using the following systems may vary with plant conditions.

It is preferred that the minimum of systems be used to accomplish the water level restoration.

((7 3.1 Maintain RPV water level between -52" and the TAF, as follows:

' NOTE TAF = 0" as read en the following fuel zone instrumentation:

P601 - RHR Section - B21-R615 P601 - RCIC Section - B21-R610

((7 3.1.1 Use the following systems :

[]7 a.

Feedwater (04-1-01-N21-1)

(1103 - O psig)

((7 b.

CRD ( 0 4 01-C11-1)

(1103 - O psig)

(1)

Operate two pumps if possible

..w

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GPJdiD GUL7 NUCLEAR STATION EMERGENCY PROCEDURI l_

l TITLE

  • Cooldown NO.Q5-S-Ql-EP-2 REV. C PAGE 2 of 7 NOT2 RCIC cperation results in Suppression Pool heating.

f]7 c.

RCIC (04-1-01-E51-1)

(1103 - 50 psig)

' NOTE Maintain a minimum of 2000 RPM to ensure sufficient oil pressure by placing the RCIC FLOW CONTROLLER to MANUALand adjusting RPM.

CAUTION Do not place an ECCS in the MANUAL mode unless, by two independenu indications :

1.

misoperaticn in the AUTOMATIC mode is con-firmed, or 2.

adequate core' cooling is assured.

z[7 d.

uPCS ( 0 4 01-E 22-1)

(1103 - O psig)

((7 e.

LPCS ( 0 4 01-E21-1)

(500 - O psig) 4[7 f.

Consensate sooster (04-1-01-N19-1)

(435 - O psig) l l

f[7 g.

Condensate (04-1-01-N19-1) (270 - O psig) i ZI7 I

h.

LPCI ( 0 4-1-01-E12 -1)

(310 - O psig) z[7 3.1.2 If while decressurizing, s high drywell pressure (1.75 psig) exists and LPCS or LPCI pump (s) are not required to assure adequate core cooling; then prevent injection from LPCS and/

or LPCI by closing the injection valve (s).

4]7 a.

LPCI toop A - E12 - r042A

((7 b.

LPCI Loop 3 - E12 - F0423 l

27 c.

LPCI Leop C - E12 - r042C

/7 d.

LPCS

- E21 - F005A

~

i I

O 3.1.3 If an ECCS system has been placed in the FANLAL mode, then f

all of the following actions are required:

a.

Be aware that the system will not automatical,1y

initiate, b

g-ey-

-w w

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GRAND GULF NUCLEAR STATION

-DIERGENCY PROCEDURE

@ ;ng:

Cooldown NO 0 5-S-01-EP-2 agy, C pag 3 3 af 7

((7 b.

Make frequent checks of the initiating or controlling parameter.

O c.

When the MANUAL mode is no longer required, restore the system to the AUTCMATIC/STANCBY mode if possible,

f[7 3.1.4 I# high Suppressicn Pool water level (18 ' 10 ")

or low condensate Storage Tank level (2'0") occurs, perform the following:

2:7 a.

Confirm automatic transfer of HPCS and RCIC suctions from the Condensate Storage Tank to the Suppression Pool.

) (1)

HPCS - E22 - F015 opens and then E22 - F001' closet (2)

RCIC - E51 - F031 opens and then E51 - F010 closer

~/7 b.

If the HPCS and RCIC suctions did not automatically transfer as designed, then manually transfer the HPCS and RCIC suctions in the sequence listed in substep a.

/~7 3.1.5 If RPV water leve'l cannot be determined or m$intained above TAF, proceed to EP-4 (Level Restoration).

NOTE

~TAF = 0" as read on the following fuel zone instrumentation:

P601 - RHR Section - B21-R615 P601 - RCIC Section - B21-R610 I

f_/

3.2 If SRV's are cycling, manually open one SRV and. reduce RPV pressure to approximately 833 psig (150 psig below the lowest SRV lif t pressure of 1033 psig af ter low low set is actuated).

((7 3.3 Depressurize the RPV and maintain cooldown rate below 100 F/hr, as follows:

NOTE In order to (1) conserve RPV water inventory, (2) protect containment i

integrity, and (3) limit radioactive release to the environment, cool-down rates greater than 1000F/hr may be required.

NOTE The systems listed in steps 3.3.1.a and 3.3.1.b are listed in order of expect effectiveness and availability.

The minimum number of systems

.u i

GPJ2;D GUIS NUC' EAR STATION EMERGENC7 PRCCIDURE

.e

! TITLE:

Cooldown NO. 0 5 -S-01-EP-2 REV.C PAGE 4 cf 7 i

f

~

NOTE con't used will make the centrol of the RPV cooldewn rate easier to acccm-plish.

--/7 3.3.1 Use the minimum nunber of the following systems to 0

maintain the RPV cooldown rate less than 100 F/hr.

z7 Main Condenser available a.

2:7(1)

Main Turbine Bypass Valves (preferred methodi (1103 - O psig)

NOTE RCIC operation results in Suppression Pool heating.

((7(2)

RCIC (0 4-1-01-E51-1 at step later) (1103 - O psig)

NOTE Maintain a minimum cf 2000 RPV to ensure sufficient oil pressure by placing the RCIC FLCW CONTROLLER to MANUAL and adj usting RPM.

(a)

Mai.ntain greater than 50 psig RPV pressure unless motor driven pumps sufficient to maintain RPV level are running and available for injection as determined by the folicwing sequence :

l.

Observe RPV water level indication to determine indicated level.

2.

Close RCIC injection valve E51-F013.

3.

Observe RPV water level'and attempt to maintain RPV water level with the mote driver injection pumps which are running.

4.

If RPV water level cannot be maintained with the RCIC injection valve E51-F013 closed, then open E51-F013.

5.

If RPV water level can be maintained with the RCIC injection valve E51-F013 closed, then RCIC can be shutdown and the RPV pressure can be decreased to less than 50 psig.

c_

GRAND. GULF NUCLEAR STATICN EMERGENCY PROCEOUP.E UITLE:

Cooldown NO.

05-3-01-EP-2 REV C PAGE 5 of 7

((7 (3)

RnR (Steam Condensing Mode) (04-1-01-E12-1 at step later) (110 3 - O psig)

~/ 7 (4)

Steam Seal Generator (04-1-01-N33-1 at step

~~

1ater) (1103 - 150 psig) z:7 (5)

Off Gas Preheaters (04-1-01-N64-4) (1103 - 200 ps:

((7(6)

SJAE's (04-1-01-N62-1) (1103 - 200 psig)

/[7 (7)

REPT's (04-1-01-N21-1) (1103 - 350 psig) z 7 (8)

RwCU (recirculation mode) ( 0 4-1-01-G 3 3-1)

(1103 - O psig) f[7 (9)

Main Steam Line Drains (04-1-01-Nil-2)

(1103 - O psig) f /(10)

RNCU (blowdown mode) ( 0 4 01-G 3 3-1) (1103 - O ps:

f[7 b.

Main Condenser not available NOTE i

RCIC operation results in Suppression Pool heating, i

l l

f[7(1)

RCIC (04-1-01-E51-1 at step later) (1103 - O psig)

NOTE 1

l l

Maintain a mintnum of 2000 RPM to ensure sufficient o,il pressure by placing the RCIC FLCW CONTROLLER to MANUAL and adjusting RPM.

i (a)

Maintain greater than 50 psig RPV pressure unless motor driven pumps s'ufficient to main-tain RPV level are running and available for injection as determined by the following sequence:

1 Observe RPV water level indication to determine indicated level.

2.

Close RCIC injection valve E51-F013.

3.

Observe RPV water level and attempt to maintain RPV water '.evel with the motor driven injection pumps which are running.

4.

If RPV water level cannot be maintained, with the RCIC injection valve E51-F013 closed, then open E51-F013.

1

GRAND GUI.F NUCI. EAR STATION EMERGENCY PROCEDURE I

EITI.E : Cooldown NO. 0 5-S-01-EP-2 REV.C PAGE 6 cf 7 5.

If RP'J water level can be maintained wit!

Eie RCIC injection valve E51-F013 closed then RCIC can be shutdown and the RPV pressure can be decreased to less than 50 psig.

-/7 (2)

RER (Steam Condensing Mode) (0 4-1-01-E12-1 at step later) (1103 - O psig)

/7 (3)

RWCU (Recirculation Mode) (04-1-01-G33-1 at step

~ ~ ~

iater) (1103 psig - 0<psig)

NOTE Fewer blowdowns with increar'd pressure reductions are desirable to minimize SRV cycle stresses.

O (4)

SRV's (04-1-01-B21-1 at step later) (1103 - O psic (a)

Ea.ch SRV actuation should be selected to equalize Suppression Pool heating, using Figure A.:as a guide.

(b)

If the continuous SRV pneumatic supply is or becomes unavailable, depressurize with sustained SRV openingu FCS*.D 00 r0474 r0433 344

!60 F041E F04LD t-328~

FOSIA F04fD D=CJtEEN A-RED 48' 311 g

r041A C M EN 0 -m

,P F0 4}It. g 289 r087L i

gy Dm

.=

F041r A 7041G 254' C-BLUg 104*

F0473 7051r 1200 0-ftrD C-MD F051*

F0413 1363 4

1000 3

- ADS VALVE 3 Se letter folloind by a celer destenates the een color en suppresston pooi terrerature recorcers M71-aC4SA, S. C, D, on panel 1H13-9970.

FIGURE A O (5)

RWCU (blowdown mode) (04-1-01-G33-1 at step u

la ter) (1103 - O psig).

GRAND.GUII NUCI. EAR STATICN ZMERGINCY PRCCIOURE ult'I :

Cooldown NO. 05-5-01-EP-2 REV. C PAGE 7 of 7 I

O 3.3.2 When the RHR shutdown cooling interlocks clear as indicate-by RPV pressure less than 125 psig, then initiate the shutdown cooling mode of RER per 04-1-01-E12-1 ac paragrapi 5.4.

'7 3.3.3 f the RER shutdown cooling mode cannot be established

_I_f,d further cooldown is required, then continue to cooldow:

an with the systems listed in substep 3.3.1.a or 3.3.1.b as applicable.

I_f, RPV cooldown beyond'that which can be accomplished by L7_

3.3.4 f

depressurization is required, then enter EP-8 (Alternate Shutdown Cooling).

/7 3.3.5 If the RPV cocidcwn is under control and the plant condi-

,yion ;is stable, proceed to cold shutdown in accordance with IOI 03-1-01-3.

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