ML19221A541

Emergency Procedure 32,Revision 1,re Loss of Operating RCP

ML19221A541
Person / Time
Site:	Crane
Issue date:	04/22/1979
From:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
OSP-790422, NUDOCS 7905230159
Download: ML19221A541 (6)

Text

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EP-32 Rev-1 4/22/79

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EP Loss of Operatino RCP Successful Natural Circulation

1.0 Puroose

To provide adequate core cooling through natural circulation in the

-.. event. of. loss. of -the opera ting JCP

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. - Loss of _R.eactor CQol ant Pumps of 8 April.1979._.

._.Contjogency Plan C-1,2,3 Ref. A Bill Lowe. to (Illegible) Telecon Note of 0800, 4/12/79 Ref. #180 NDT Pressure / Temperature Curve Ref. #10 Natural Circulation - Minimum RC5 Pressure vs that curve with saturation curve added Ref. #48 Preparation for an initiation of natural circulation.

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Ref. #168 Effect of Partial Flow Blockage on N.C.

Ref. #156 RCP Startup Procedure (B&W procedure 15, Rev. 4)

Ref. #11 Loss of P.C Flow /HPl Ref. #(B&W) 77 Loss of RCP - Successful Natural Circulation (B&W 486, 4/19/79)

Ref. #TSG 071 Loss of Reactor Coolant Pump (R. Keaten 4/19/79) 3.0 Limitations and Precautions 3.1 Operational limits of RCP with backup RCP's available:

3.

frame v ibra tion exceeds 5 mils.

or

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b.. shaf t vibration exceeds 30 mils and upper seal leakage & return flow increases to greater than 1.9 GPM.

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. ' EP-32 Rev. 1 4/22/79 3.2 Operational limits of RCP with no backup RCP available.

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a.

Shaft vibration > 70 mils or b.

Upper seal leakage > MU system capability to maintain RC system water level.

4.0 Symotems

=-.,C_-Flow in the operating loop decreases or becomes erratic 4.1 R

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~~4.2 Complete 16ss of RC -flow in operating loop. -

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.RC._ Rump. Tr i.p. a n nu nc i a to r'.

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4.4 RCP limits.(section 3) exceeded.

4.5 Indications the RCP has stopped as observed by no running current (amps) or vibration.

NOTE:

Initial Condition Heat removal through A OTSG in Steaming Mode B OTSG H 0/H O loop not yet ready.

2 2

me Feedwater to OTSG supplied thru agry FW nozzles.

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5.0 Immediate Actions 5.1 Attempt to establish natural circulation 5.1.1 Immediately begin raising RCS pressure to approximately 900 psig i 100 psig (to increase margin to saturation).

5.1. 2 Trip the tupbine 5.1.3 Without altering the feedwater lineup or flow rate allow, OTSG "A" level to slowly increase to 430" on the wide range instrument.

Secure feedwater flow, and allow OTSG "A" level to decrease to 400".

Re-establish feedwater flow at the previous rate to increase level to 430" Repeat as necessary to maintain level between r

400" - 430".

NOTE 1 - Following the above actidhs and when equilibrium conditions are established. RCS temperature T c should stabilize at about 200 0F.

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... _ EP-32, Rev. 1 4/22/79 Note 2 - Natural Circulation is indicated by an increase in RCS A T to a new value greater than the approximately zero A T of forced circulation.

This A T is expected to be approximately 10 to 35 when equilibrium conditions 'of flow have been achieved.

Initially, however, A T wil' increase to greater values which cuuld be as much as 15 tt, 400F in the five to ten minute period after the loss of RCP, followed by a decrease to the equilibrium AT.

The a.T values in this

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interpretati6n of analytical data.- It. should -take abous

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- Th'e sy's' tem bill i espond slowif to EFangeNihile

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in the; natural _ circulati6n mode; The_ loop transport-time - - _ - - _ - -, - -

is~ about-20 minutes, therefore, changes in steam demand and ~~

feed rate should be made slowly and the system should be 9iven time to equilibrate before additional changes are made.

5.1.4 Manually record and plot T, T and T every h

c sta twenty (20) minutes.

Read and record all operable in-core thermocouples every ten (10) minutes.

5.1.5 If any of the (4) criteria provided below are exceeded, adequate Natural Circulation has not been established, therefore, proceed to step 5.2.

5.1.5.1 If T in the loop with the OTSG in the steaming g

mode exceeds 4200F, go to step S.2.

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s 5.1.5.2 If any thermocouple excess 1000 F go to step 5.2.

5.1.5.3 If any three (3) thermcouples have readings exceeding 800 F go to step 5.2.

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E'im* F 5.1.5.4 At least 6 thermoccuples must be below W F, otherwise go to step 5.2.

NOTE:

After natural circulation has been established nd T will be nearly it is expected that T equival ent.

However,H stm T

snould not be less than stm

-T for natural circulation to occur.

In making the' '

c above comparisons, an instrument error of up to +~

50F must be considered.

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_~ _. L 5.1. 6 Af ter temperatures have stabilized (1/2 - I hr expected),

decrease steam flow from the "A" OTSG by shutting the M5 supply valves to the MSR "A", MS-V35A and MS-V 36'A.

NOTE:Following the above actions and when equilibrium conditions are established, T f rom the plot in step c

5.'.4 should have increased to about 205 0F.

5.2. -Ifm taral circuh-ion a no i. estahl-isted ; a ttempt-to-regne - -

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.Tiow by starting RCPV ia ~'he followTng sequence.' 2.~ -- ~ -. - -

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. Att empt. to' res ta rt=RC-P-2A ' a s-f O U ows : 5:-l.~===r =.__- _-:: :-:..=J: a -

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a)- Start and run RC-P-2A.High Pressure Lift:

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and Backstop oil pumps. - -

NOTE:

The motors can be started with acceptable risk without the backstop lube oil pumps.

RC pressures between 800 and 1200 P.S.I. should allow operation of the motors ~ without the high pressure oil lift system.

At pressures below 800 psi, start up without high pressure lift system may not be successful but may be attempted.

b)

Start RC-P-2A.

c)

Open or check open seal return valve MU-V-33B.

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Three start attempts are allowed from cold condition.

NOTE:

s 5.2.2 If RC-P-2A cannot be started, attempt to start RC-P-1A as follows:

a)

Start and run RC-P-1 A High Pressure Lift and Backstop Oil Pumps b)

Start RC'-P-1A c)

Open/ check open seal return valve MU-V-33A.

5.2.3 If RC-P-1A cannot be started, start RC-P-1B or 2B as follows:

a)

Obtain HP person to accompany A.O. to establish seal injection on RC-P-1B and 2B by opening MU-V-379 and MU-V-380.

NOTE:

RWP must be prepared each shift. cesignating personnel wh'o will make entry.

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- EP-32, Rev. 1.4/22/79

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~r-5.2.4 Start Au Oil Lift and AC Backstop Pumps for RC.P_lB ano 23.

5.2.5 Verify intermediate and flSCCW is operating.

5.2.6 Verify Seal Injection Flow on RC-P-1B and 28.

5.2.7 Open MU-V33 C & D.

Verify RC Pump Seal staging by o b s e.rv i ng_.s ea l c a v i ty J re s s _u re.

.- - 5.2 8 Verify RC Pump Seal, Return Flow (41.91 gpm) con RC-P-lB _ _.....

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-5.2.9-With steps f.2.2 through 2.7 compl ete, start-

__RC-P-1B.;($

5.2.10 If RC-P-1B start attempt unsuccessful, start RC-P-2B.pg 5.2.11 Monitor the following during startup through the transient and thereaf ter for proper indication.

Upper seal cavity pressure, lower seal cavity pressure, seal return temperature, upper seal leakage, seal return flow, pump -shaft vibration and :notor bearing temperatures.

5.2.12 Close MU-V33 on non-operating pumps.

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5.2.13 Close seal injection valves on all but standby pump and-readjust seal injection to minimiza m"heup.

5.2.14 Secure oil lift pumps on all non operating pumps.

5.2.15 If an RCP was successfully started, return RCS pressure and "A" OTSG level to the previous condition.

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5.3 If no RC pumps can be started, attempt to establish natural circulation.

5.3.1 Verify RCS pressure is 900 + 100 psig and "A"

OTSG level 400-430".

Adjust RCS pressure and OTSG level to reach andmaintain those parameters.

5.3.2 Allow temperatures to stabilize for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.

Du ring this period of time, read and record all' operable thermocouples every ten minutes.

164 064 EP-32 Rev. 1 4/22/79 2-.^~

If any thermocouple exceeds 1200 F prior to successfully 5.3.3 establishing tiatural Circulation, go to step 5.4.

0 5.3.4 If-any 3 thermocouples exceed 1000 F prior to successfully establishing liatural Circulation, go to step 5.4.

5.3.5 If at any time during stabilization or natural

__..,_., _ ___ci.rcul a ti on. a t temp ts Th in the loop with the OTSG in the steaming mode.. exceeds 5000F. proceeed.to.._;_

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5.4 If natural circulation is not established, go into HPI per EP33, starting with Step 3.2.

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