ML20204J746

From kanterella
Jump to navigation Jump to search
Rev 3 to Emergency Operating Procedure ES-3.2, Post-Steam Generator Tube Rupture Cooldown Using Blowdown
ML20204J746
Person / Time
Site: Millstone, Haddam Neck, 05000000
Issue date: 06/03/1988
From:
CONNECTICUT YANKEE ATOMIC POWER CO.
To:
Shared Package
ML20204H467 List: ... further results
References
ES-3.2, NUDOCS 8810250241
Download: ML20204J746 (12)
v • d • e


Text

_ _____ ____ _ . _

JUN 3 1988 UTH NUMBER REV. ISSUE, TATE

. ES 3.2 POST.SGTR COOLDOWN USING BLOWDOWN Rev. 3

(

A. PURPOSE I l

This procedure provides actions to cooldown and depressurize the plant to cold shutdown conditions following a steam generator tube rupture. This recovery method depressurires the ruptured SG(s) by c raining it using SO blowdown.

B. SYMPTOMS OR ENTRY CONDITIONS '

, This procedure is entered from E 3, STEAM GENERATOR RJBE RUPTURE, Step 36, $

if plant staff selects the blowdown method. j l t

i I l

d i

i E

l i

i l

8010250241 DR 001007 ADOCK 05000213

, PDR i

Page 1 of 12 l

JUN 3 1988

. NtmBER TT12E REY. ISSUE /DATE ES 3.2 POST.SGTR COOLDOWN USING BLOWDOWN Rev.3 1

STEP /.CTION/EXPECIED RESPONSE RESPONSE NOT OBTAINED l NOY8: o FOIDOUTPAGE SHOULD BE OPEN.

l o IF THE LOOP WITH THE RUPTURED SG(s) WAS IS0 LATED BY CLOSING THE LOOP IS0lATION VALVES. THE LOOP SHOULD BE COOLED DOWN IN ACCORDANCE WITH ATTACHMENT A.  ;

1 TURN ON PR7.R }{ EATERS AS NECESSARY TO SATURATE PRZR

' WATER AT RUI'IURED SG(s)

PRESSURE.

2 BORATETilE RCS FOR COOLDOWN IN ACCORDANCE WITH  !

SUR 5.3-19,

BORATION REQUIREMENTS FOR REACTOR SIRTIDOWN  !
a. Check MCC 8 ENERGlZED a. Energize MCC . 8.

3 VERIFY ADEQUATE SHUIDOWN

, MARGIN: '

a. Sample ruptured SG(s) (
b. Sample RCS ,

i

c. Check shutdown margin ADEQUATE c. Borate Rs'S as necessary. j I

l i

i

(

I I

i

, i 4

i I I

Page 2 of 12 1

L i

JUN 3 R8B

, NUMBER TTn.E REY. ISSUE /DATE l ES 3.2 POST SGTR COOLDOWN USING BLOWDOWN Rev.3 l l

t

~

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l

r 7 l

CAUTIONt MONITOR DWST LEVEL. START MAKEUP TO DW.VT BEFORE l LEVEL DECREASES TO $4,000 Gall.ONS.

L J 4 CliECK INTACT SG LEVELS: l

a. Check wide range levels - a. Maintain total AUX feedwater How GREAlliR TilAN 63 % greater than 320 GPM until wide (67 % FOR ADVERSE range levelin at least one SG is CONTAINMENT) greater than 63 %

(67 % for adverse containtnent),

b. Control AUX feedwater now to b. lE any So wide range level continues maintain wide range levels between to increase in an uncontrolled manner, 63 % and 69 % TliEN QQIQ E 3, (67 % and 69 % for adverse STEAM GENERATOR TUBE containment) RUl*TURE, Step 1.

l I

i l

i i

I 5

l l

1 Page 3 of 12

JUN 3 WBB

, NUMBER TTIM REV. ISSUE /DAR ,

ES 3.2 POST-SGTR COOLDOWN USING BLOWDOWN Rev.3

( '

STEP ACI10N/ EXPECTED RESPONSE RESPONSE NOT OBTAINED NOTE: SINCE RUPTURED SG(s) hfAY CONTINU2 TO DEPRESSURIZE TO LESS THAN THE hilNihtubi RCS PRESSURE NECFSSARY FOR CONTINUED RCP OPERATION, COOLDOWN TO COLD SHUTDOWN SHOULD BE COSfPLETED AS QUICKLY AS POSSIBLE, NOT TO EXCEED 100*F / HR.

L i 5 INITIATE RCS COOLDOWN TO 300* F (277' F FOR ADVERSE CONTAINMENT)

a. Mair.tain cooldown rate in RCS l ,.

cold legs -  !

LESS THAN 100* F/ HR  ;

b. Dump steam to the condenser b. Manually OR locally dump steam from intact SG(s) fmm intact SG(s): ,

o Uv atmospheric vent valve. ,

IE ns intact SG available, THEN perform one of the following: l l

o Use faulted SG I QR o GQIQ ECA 3.1, SGTR WITH LOSS OF REACTOR COOLAST-1 SUBCOOLED RECOVERY I

DESIRED, Step 1.

i  !

t 1

l \

\ l l  ;

l Page 4 of 12

JUN 3 1988

, NUMBER EU REV. ISSUruDATE ES.3.2 POST.SGTR COOLDOWN USING BLOWDOWN Rev.3 l

(

STEP ACTION / EXPECTED RESPONSE RESTONSE NOT OBTAINED r 7 CAUTION: RCS AND RUPTURED SG(s) PRESSURES MUST BE MAINTAINED LESS THAN THE RUPTURED SG(s) SAFETY VALVE SETPOINT.

& J 6 CONTROL RCS PRESSURE AND htAKEUP FLOW TO hilNIbilZE f RCS TO SECONDARY LEAKAGE:

a. Perform appropriate action (s) from table below:

PRZR LEVEL RUPTURED SG(s) LEVEL INCREASING DECREASING OFFSCALE HIGH LESS THAN 15 % o Increase RCS Increase RCS o increase RCS

( 35 % FOR makeup now makeup now makeup now ADVERSE CONTAINhiEST ) o Depressurize RCS o hiaintain RCS and using Step 6 b ruptured SG(s) pressures equal l

l BEnVEEN 15 % Depressurize RCS Turn on PRZR Maintain RCS j AND 50 % using Step 6 b heaters and ruptured ,

( 35 % AND 50 % SG(s) pressures  !

FOR ADVERSE equal CONTAINhiEST )

BE'nVEEN 50 % o Depressurize RCS Turn on PRZR Maintain RCS AND 76 % using Step J b heaters and ruptured .

( 50 % AND 69 % SG(s) pressures FOR ADVERSE o Decrease RCS equal CONTAINMENT) makeup now GREATER THAN Decrease RCS Tum on PRZR Maintain RCS

'M % makeup now heaters and ruptured iFOR SG(s) pressures i ASE equal I Co.fAINMEhT )

i

b. Use normal PRZR spray to b. IE letdown is in service, i accomplish action specified in THEN use auxiliary spray.

IE letdown NQIin service, T11EN use one PRZR PORV. ,

Page 5 of 12 I

JUN 319gg

, NtStBER TTlu REY. ISSUE /DAE ES-3.2 {

POST SGTR COOLDOWN USING BLOWDOWN Rev.3 i

(

STEP ACT10N/ EXPECTED RESPONSE RESPONSE NOT OBTALNED l

1 7 CHECK IF SOLID PLANT CONDITIONS SHOlfLD BE ESTABLISHED:

a. Check PRZR steam phase temperature - a. Continue RCS cooldown and LESS THAN 450' F depressurization, WHEN PRZR temperature is less than 450' F.

THEN do step 7 b.

b. Increase PRZR level to 100 % i l

I l

i l

l Page 6 of 12

i JUN 3 1988

, NUMBER TTH.E REV. ISSUE /DATE i ES 3.2 POST SGTR COOLDOWN USING BLOWDOWN Rev.3 l

, i STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINTD 1

NOTE: o THE SI SYSTEbf AfUST BE DISABLED BEFORE RCS l TEbfPERATURE IS REDUCED BELOW 315

  • F. ,

o IF RUPTURED SG(s) PRESSURE IS GREATER THAN 325 PSIG, ESTABilSH BLOWDOWN FROh! STEAbi GENERATOR TO l, REDUCE STEAbf GENERATOR AND RCS PRESSUE.

l 1

8 PERFORM COLD SHUTDOWN ALIGh3 TEST:

a. Check core exit thermocouples - a. Continue RCS cooldown.

LESS THAN 350' F WHEN core exit thermocouples are less than 350' F.,

b. Align core cooling equipment IN ACCORDANCE WITH NOP 2.3 4, 2 HOT STANDBY StODE 3 TO COLD SliUIDOWN htODE 5 Ah12 i NOP 2.121, '

CORE COOLINO SYSTEht LINEUP FOR SHUTDOWN AND AT POWER OPERATION

c. Check iflow temperature over c. WHEN all conditions are satisfied, a pressure protection relief valves THEN do step 8 d.

4 should be placed in service:

1. Check PRZRlevel SOLID i 2. Check RCS temperature -

j  !.ESS TilAN 325' F l 3. Check PRZR temperature - 4

, LESS 111AN 430* F

! 4. Check RCS pressure -

) LESS THAN 325 PSIO

d. Place low temperature over pressure protection relief valves in sersice IN ACCORDANCE WTI11 NOo 2.3 4, ilOT STANDBY htODE 3 TO COLD SHUTDOWN hiODE 5 {

Page 7 of 12

JUN 3 1988 t

. NUMBER TTIM REV. ISSUE /DATE  !

ES.3.2 POST.SGTR COOLDOWN USING BLOWDOWN Rev.3 i

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 7

9 CHECK IF RCS C00LDOWN I SHOULD BE STOPPED: l l

a. Chxk RCS temperature - '
a. RETURN IQ Step 3.

LESS THAN 300* F (277' F FOR ADVERSE CONTAINhtEST)

b. Stop RCS cooldown 10 CHECK RUlrTURED SG(s) REFILL RUPTURED SG(s) TO 69 % L WIDE RANGE LEVEL USING AUX FEEDWATER FLOW. '

GREATER THAN 63 %

(67 % FOR ADVERSE E EITHER ONE OFTHE CONTAINhtENT) FOLLOWING CONDITIONS OCCUR, THEN STOP FEEDWATER FLOW TO THE RUlrrURED SG(s):

o Ruptured SG pressure (s) decreases in an uncontrolled manner o Ruptured SG pressure (s) increases i

to 935 PSIG.

i i NOTE: BLOWDOWN FROM RUPTURED SG(s) MAY BE STOPPED WHEN RHR IS IN SERVICE.  ;

j l 11 ESTABLISH BLOWDOWN FROM L

RUI'TURED SG(s):
a. Perform the following: a. E blowdown from rupture SG(s)
can NQI be established, -

! 1. Isolate intact SG(s) from the 111EN QQID either ue of the ,

blowdown tank following:

2. Lineup blowdown tank drains o ES 3.1, to the blowdown cooler POST-SGTR COOLDOWN IN ACCORDANCE WTDI USING EACKFILL, Step 1 NOP 2.1414, STEAhi GENERATOR BLOWOFF M i 1

TANK OPERATION l j o ES 3.3,

< POST SGTR COOLDOWN USING STEAhi DUhiP, Step 1. j i

i Page 8 of 12 i

JUN 3 1988

. NUMBER TTlu REY. ISSUE /DAE ES 3.2 PO^T SGTR COOLDOWN USING BLOWDOWN Rev.3 )

t i

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED l

12 CONTROL RCS MAKEUP AND ,

i LE1DOWN FLOW TO hiAINTAIN RCS PRESSURE ,

NOTE: THE UPPER HEAD REGION MAY VOID DURING RCS <

l DEPRESSURIZATION IF RCPs ARE NOT RUNNING. THIS MAY RESULT IN A RAPIDLY INCREASING PRZR LEVEL. l i

13 DEPRESSURIZE RCS TO MINIhilZE RCS TO SECONDARY LEAKAGE: f

a. Adjust charging and letdown a. Use alternate letdown to reduce ,

flow to reduce RCS pressure RCS pressure. l

b. Maintain RCS pressure at  ;

ruptured SG(s) pressure

c. Maintain RCS subcooling based on

[

core exit thermocouples - 1 i i GREA'ER DIAN 32' F l

. (SEE OPPOSTm PAGE ,

FOR ADVERSE COSTAINMENT) l' l

14 CIIECK IF RCPs MUST BE I SHUTDOWN: , i J

l a. Check the following: a. GQIQ Step 15. i i

i o Number 1 seal differential-  !

i LESS THAN 275 PSIG i 2 l '-

o Number I sealleakoff flow - i LESS THAN 0.2 GPM i i

b. Stop affected RCP(s) l j l ,

i i a I

i I I

]

i i

! l _.)

Page 9 of 12 1

JUN 31983

, NUMBER TTTIE REV. ISSLTJDATE  !

ES 3.2 POST SGTR COOLDOWN USING BLOWDOWN Rev.3 i l

l

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAINED 15 CliECK IF RHR SYSTEM CAN BE PLACED IN SERVICE
a. Check the following: a. RETURN I_Q Step 10.

I

o. Check RCS temperature - i LESS DIAN 300' F l l (277' F FOR ADVERSE -

CONTAINMENT)

o. Check RCS pressure - 4 LESS THAN 300 PSIG I (t 310 PSIG FOR ADVERSE CONTAINMENT)
b. Place RHR in service IN ACCORDANCE WTTH r 1

NOP 2.91. '

RHR SYSTEM PLACING SYSTEM '

IN SERVICE 2 ,

16 CONTINUE RCS COOLDOWN TO i COLD SHUTDOWN: .

I .

a. Maintain cooldown rate in RCS i cold lelts - t LESS 'RAN 100' F / HR i 3

, b. Use RHR system ifin service

c. Dump steam to the condenser c. Manually OR locally dump steam .

1 j from intact SG(s) from intact SG(s): ,

l j o Use atmospheric vent valve. j IE no intact SG available.  !

l t THEN perform one of the following: l l

o Use faulted SG i OfL i

o QQIQ ECA 3.1. ,

i SGTR WID{ LOSS OF l l REACTOR COOLAST- .

SUBCOOLED RECOVERY -

) DESIRED, Step 1. i I l  !

! l l

f Page 10 of 12 i

h JUN 3 1988

, NUMBER TTIM REY. ISSLT/DAR }

ES 3.2 POST SGTR COOLDOWN USING BLOWDOWN Rev.3 I

' r

(

STEP ACTION / EXPECTED RESPONSE RESPONSE NOT OBTAENTD 17 CHECK RCS TEMPERATURE RETURNIQ STEP 10.

LESS THAN 200* F ,!

18 EVALUATE LONG1ERM PLAST STATUS:

a. Maintain cold shutdown condidons j l
b. Consult plant engineering staff l  !

END j l 1

{

! i i

I i

)

l i

I l l l i

l I

t i

i I

i l

i I

4 Page 11 of 12

JUN 3 1988 NUMBER uld REY. lSSl'EDAR ES 3.2 {

POST SGTR COOLDOWN USING BLOWDOWN Rev.3 l-i l

A*ITAC11htENT A His procedure is to be used to cooldown an affected loop if it had been properly isolated j in E 3, STEAh! GENERATOR TUBE RUP'nJRE.

I '

INITIAL CONDITIONS

1. Loop Tc and n isolation valves are closed and loop bypass valve is open.
2. Loop drain htOV is open and loop pressure is being maintained by drain header throttle valve, Dil htOV 310.
3. Seal water is being supplied to the RCP and the RCP is shutdown.

PROCEDURE

1. Lineup the B AhtT to the suction of the metering pump and lineup the metering pump discharge to the fill header only.
2. Perform the following: ,

o Close A and B charging pump discharge isolaG.m valves to the fill header, j I o Open affected loop manual drain valve and close the affected loop drain htOV. ,

o Lineup the drain header to the PDT. t

3. Open affected loop fill header htOV and then borate the affected loop to the cold shutdown boron concentration. When boration completed, lineup the metering pump suction to the RWST and flush approximately 200 gallons through the lines to the affected loop.
4. Perferm the following: l
a. Isolate unaffected SGs from the blowdown tank. Lineup the affected SG(s) to the blowdown tank. l
b. Lineu ) the blowdown tank drains through the blowdown cooler IN ACCORDANCE  !

WIE NOP 2.14-14, STEAh! GENERATOR BLOWOFF TANK OPERAT10N. j

5. Feed affected SG(s) as necessary to maintain wide range SG level (s)  !

between 59 % and 69 %.

1

6. hiaintain affected loop temperature and pressure within limits of Technical Specifications Section 3.4, FIGURE 3.4 9 during loop cooldown. Periodically sample affected loop to insure boron concentration is withm specification.  ;
7. When affected loop pressure is less than 100 PSIG, close seal water retum htOV from affected RCP.  ;
8. When the loop is cooled down and depressurized. isolate seal water supply to affected i RCP. Prepare to drain the affected loop IN ACCORDANCE WTni NOP 2.4 5, ,

DRAINING AN ISOLATED LOOP.

{

Page 12 of 12

- - . , - - . . - _ ~ . , _ - - , n- - _ ,n_ - - - - , - - - - - - - . , , , ~

Retrieved from "https://kanterella.com/w/index.php?title=ML20204J746&oldid=3062328"