ML20024B897

Nuclear Power Plant Operations Manual,Vol 2

ML20024B897
Person / Time
Site:	Crane
Issue date:	04/27/1982
From:	BABCOCK & WILCOX CO.
To:
References
TASK-01, TASK-02, TASK-1, TASK-2, TASK-GB B&W-0614, B&W-614, PROC-820427, NUDOCS 8307110740
Download: ML20024B897 (9)

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4 OFR UNIT I LCSS OF REACTOR COOLANT / REACTOR CCOLMIT SYSTD4 PRESSURE CP 1202 6 1.

PURPOSE:

1) To provide emergency procedures to be folleved in the event of loss of reactor coclant/reacter coolant system pressure, for leak rates ranging fres 30 gpm to and including that associated with a 36" rupture.

2) This procedure is divided into three categories:

SECTICN CA*EGORY k

Leak or rupture within capability of one makeup pump capacity to maintain RC system pressure and pressurizer level.

5 Leak or rupture within capability of high pressure injection system to maintain RC system pressure and pressurizer level.

6 Large rupture (in excess of capability of high pressure injection system).

2.

DESCRIP" ION :

This procedure describes the action to be taken in the event of a sudden and rapid unexplained decrease in RC system pressure and pressurizer level caused by a leak or rupture in the high pressure envelope of the primary system.

The initial symptoms could be caused by a malfunction of the makeup system or by a steam line rupture, as well as by a less of coolant from the RC system. The operators should assume the cause of the symptoms described above is a RC leak or rupture, unless another cause can be i=nediately established.

This procedure applies to the RC system leak rates greater than 30 gym.

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Leak or rupture within capability of cne makeup pump capacity to =aintain RC System Pressure and pressurizer level.

k.1 Symptoms:

1) Pressurizer level and RC system pressure decrease, without an associated RC average temperature change, initially with cne er two makeup pu=ps running and then hold steady or begin to increase as the pressurizer level control valve opens fully and letdevn and seal return flows are isolated (step k.2.1).

2) Makeup tank level decreases at a rate approxi=ately equal to the system leak rate l' to k inches per minute which is equivalent to a leak rate of 30 - 120 gpn after letdown and seal return flows are isolated (step k.2.1).

3) High radiation level alarm in reactor building.

k) Possible reactor building sump level high alarm.

h.2 I=nediate Actien:

1) Close the letdown isolation valve and the RC pu=p seal return isolatica valve.

2) Reduce load as rapidly as possible in preparation for a normal shutdova.

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3) Cc=cence normal shutdown and cooldown per Plant Shutdown OP 1102 10.

h) Maintain makeup tank level above the icv level alarm point and maintain pressurizer level in the normal operating range.

NOTE: The operator should line up a source of borested water equal to or greater than FC system, boren concentration.

NOTE: If there is not an adequate supply of berated water available from coolant storage, of if the operator is unable to maintain the

=akeup tank level above the lov level alarm frem this source, of if the pressuri:er level drops below the lov level alarm point, manually initiate high pressure injecticn then trip the eter.

Carry out the procedure in Sectien 5 starting at Step 5.

1 h.3 Follow Up Action:

1) When the plant has been shutdown the RC system has been cooled down and depressurized, monitor radiation levels to determine when it is safe to send personnel into the Reactor Building to locate and make preparations for repair of the rupture.

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a 5

Leak or rupture within capability of the High Pressure Injection Systen to maintain RC Pressure and Pressurizer Level.

5.1 Sy=ptoms:

1) Pressurizer level and RC pressure decrease, without an associa,ted RC average tenperature change, and continues decreasing as the pressurizer level control valve opens fully and letdown and RC pu=p seal return flows are isolated (Step 5 2.1).

2) Makeup tank level decreasin6 rapidly at a rate greater than 3 h

inches per minute which is equivalent to a leak rate greater than 90 - 120 gp:. When letd=va and PC pump seal flevs are isolated (Step 5 2.1).

3) High radiatica level alar:s in the reactor building.

h) Possible high Reacter Building su=p level.

5.2 I==ediate Actien:

1) Close the letdown isolatien valve and the RC p=p seal return valve.

2) If the reactor has not already tripped on icv pressure, trip the

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reactor =anually.

3) If high pressure injection has not already been actuated aute=atically, actuate high pressure injection manually, h) If RC syste= pressure and pressuri:er level continue decreasing after initiatien of high pressure injection perform the precedure for large rupture section 6.2.

5) If the RC systen and pressurizer level stop decreasing er begin to increase upon initiation of high pressure injection maintain pressurizer level as close as possible to the =cz=al operating range by varying the nu=ber of running =akeup pu=ps.

. NOTE: Limit HP Injection flow to 500 gp= per flow path to prevent pu=p runout.

(If all three makeup p=ps are running the maxi =u= allevable flow through the HP Injection flow path into loop A is 1000 gyn).

5.3 Follow up Actien:

1) Reduce the number of running RC pu=ps to one in each loop.

2)

Cooldown and depressurice the RC syste=, fencving the ner=al plant cooldevn procedure OP n02 n, as c1csely as possible with the exception that Engineered Safeguards Syste=s, except the core ficoding syste=, =ust not be bypassed, or isolated. The safe 5uards syste=s vin thus be available to actuate aute=aticany as RC system pressure decreases or Reacter Building pressure increases.

Continue centro ning pressuricer level by varying the nu=ber of running makeup pu=ps as necessary.

NCTE:

If the borated vater stcrage tank level reaches its lo-lo level alar = point (this would take at least 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />) before RC syste= pressure reaches 200 psig start NSRW Pu=ps IA and 13, open NSCW discharge P.:=ps A and B valves 35-5V92 and NS-SV93, CW supply and return valves (for DH ccelers A and B) NS-SV9h and NS-SV95, NS-SV96 NS-SV97 and start the Nuclear Service P.:sps 1A and 1B open RB su=p suction valves DH-SV51 and LH-SV60 and DH-SV62, and manuany operate LP supply to HP suction A and C valves DH-SV59 and DH-SV61, and start icv pressure injecticn I,

The low pressure injection pumps vin thus take a suctica pu=ps.

frc= the reactor building su=p and discharge to the sucticn of the =akeup pu=ps.

When Lov pressure injecticn is initiated at 200 psig the low pressure injection valves DH-SYST and DH-SV58 vill open and the icv pressure injection pu=ps vill inject directly into the reactor.

The =akeup pu=ps =ust then be stopped and the LP supply to HP suction A and C valves DH-SV60 and DH-SV62 =ust be closed.

3)

As RC syste= pressure decreases belov NFSH required for RC pu=p operation, step the RC pu=ps.

(Figure 1 Plant Shutdevn Procedure OP 1102 10) k)

Manually initiate LP injection at 200 psig, if aute=atic LP injection did not occur.

Start NSRW pu=ps lA and 13 cpen NSCW pu=p discharge valves NS-SV92 and NS-SV93, CW supply and return valves for DH coolers A and B.

NS-SV9k and NS-SV95, NS-SV96 and NS-97 start NSW pu=ps 1A and 13.

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• u c the LP ;r :

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1re running and the LP inje::ien is fun::1:ning pr:perly, step the.a::np pumps.

6)

'ahn the terated vr. er ::: rage tank res:her its lo-10 level point, open the ?3 sump sucti;n va'ves DE-5'/51 ani ::!-s';5.: then shu- -he berated va:er storage tank su::i:n val. es A and 5 ;E-S'!$7 and OH-S'l63.

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6.

Large Rupture (in excess of the capability cf the high pressure injection syste=).

1) Sy=ptc=s:

1)

Rapid and unexplained decrease in RC system pressure and pressurizer level, with associate alar =s.

2) High radiation level alar = in the reacter building.

3) Reactor building su=p high level alars.

k) Reacter trip, turbine trip, and safeguar:is system actuated alarms.

5) Reacter building pressure and te=perature increasing.

2) !==ediate Actien:

1) Verify that reacter trip occurs at or before 1800 psig if not already tripped.

2) Verify that high pressure injecticn is initiated at 1500 psig (decreasing) RC pressure or b psig (increasing) R3 pressure as follows: Check en the engineered safeguard panel that all EP

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injection equipment started (channels 1 9. - 2 have a solid bar of white lights). d!"any high pressure injection ec=penent fails to assu=e its engineered safegaards status aute=atically, the operr. tor should accuate them =anually.

3) Verify that injectica frc= core flood tanks cecurs at 600 psig decreasing.

b) Verify that LP injection is initiated at 200 psig (decreasing)

R3 pressure or k psig (increasing) R3 pressure as follows: Check on the Engineered Safegaards panel that all LP injection equipment started (channels 3 and k have a solid bar of white lights). If any LP injection ec=ponent fails to assume its engineered safegaards status aute=atically, the operater should actuate the: =anually.

5) If R3 pressure increases to a psis, verify that R3 isolatica is actuated and that e=ergency R3 cooling is initiated as fellevs:

Check en the engineered safeg2ards panel that all R3 isolation valves and R3 cooling units started (channels 5 and 6 have a solid bar of white lights) if any R3 isolatica valves or R3 cooling units fail to assu=e their engineered safeguards status aute=atically,

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the operator should actuate the: =anually.

3) Fellev Up Action:

1) Stop RC punps.

2) Close main and energency feed water bicek valves; stop the e=ergency feedvater pu=ps.

3) Insure that the turbine has tripped; if net trip =anually.

k)

After initiation of LP injectien, when the LP injection syste=

is functiening properly, step the =akeup pumps.

5)

When the SWST level decreases to the lo-lo level alar =, open DH cooler C*4 supply and return valves (NS-SV 9h, SV95, Sv96, and SV97) cpen the R3 su=p suction valves DH-SV51 and DH-Sv52 then shut the EWST suction valves A, and B DH-SV87 and DH-5788.

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