ML20141N156

Procedure Fcr 85-200, Main Feedwater Pumps Rapid Feedwater Reduction Speed Setpoint

ML20141N156
Person / Time
Site:	Davis Besse
Issue date:	02/26/1986
From:	TOLEDO EDISON CO.
To:
Shared Package
ML20141N145	List: ML20141N144 ML20141N147 ML20141N150 ML20141N153 ML20141N156 ML20141N160 ML20141N163 ML20141N168 ML20141N172 ML20141N176 ML20141N179 ML20141N180
References
FCR-85-200, TAC-61015, NUDOCS 8603040425
Download: ML20141N156 (5)

Text

.. . - -

MFP ltFR SPEED SETPOINT FCR 8.5-200 I. PURPOSE A. Modify RFR so that MF Pump speed and the control valve change on a reactor trip is done in a sacoth controlled fashion.

II. DESCRIPTION I A. After a Rx trip the MF Pumps are targeted to a post trip speed.

1. The control valves close rapidly to decrease FW flow rate.

2. Combination of the two is suspected of tripping the MFP's on high discharge pressure.

B.

RFR circuit has been modified to correct the control problem.

. 'l.__A signal lag has been added to the circuit of the MF pumps and control valves.

a.- The output of the signal lag module for the MF Pumps will change exponentially with a 18 second time constant from the total FW demand just prior to trip to the RFR setpoint.

b. The output of the signal lag module for the control valves will change exponentially with a 4.5 second time constant from total FW

' demand just prior to trip to the RFR.

setpoint.

III.

SUMMARY

- - - - ~~ ~~

A. Modifies the Integrated Control System (ICS) Rapid Feedwater Reduction (RFR) circuit so that the Main Feed

--. - Water Pumps -change speed in a smooth controlled fashion from pretrip operating speed to the RFR speed (~ 4600 RPM)

B. Modifies the circuitry so that the main and startup FW control valves on both FW loops change position in a smooth, controlled fashion from their pretrip position to their post-trip, target RFR position (17% on SU) 8603040425 860226

PDR ADOCK 05000346 V PDR 1

03J EC V ES

1. STATE THE PURPOSE OF THE RAPID FEEDWATER REDUCTION

2. IDENTIFY THE CONDITIONS THAT WOULD RESULT IN A RAPID FEEDWATER REDUCTION ACTUATION.

3. DESCRIBE THE FEEDWATER RESPONSE DURING A RAPID

, FEEDWATER REDUCTION ACTUATION 4 DESCRIBE HOW A RAPID FEEDWATER REDUCTION ACTUATION IS TERMINATED PURPOSE THE RAPID FEEDWATER REDUCTION (RFR) CONTROLS THE SPEED OF THE MAIN FEEDWATER PUMPS AND THE POSITION OF THE MAIN AND STARTUP FEEDWATER CONTROL VALVES FOLLOWING A REACTOR TRIP FROM POWER, TO ENSURE PROPER FEEDWATER RESPONSE.

4 CONDITIONS NECESSARY TO INITIATE A RFR I. AT LEAST ONE MFP NOT TRIPPED

2. ALL CONTROL VALVE IN AUTO

3. RFR DEFEAT SWITCH IN "0N" POSITION i

4. REACTOR TRIP  !

k

_BAPID FEEDWATER REDUCTION

+24 VDC .

i

'l MFP RESET '$r '\ $ br "2 MFP RESET y 0FF RFR DEFEAT SWITCH MODULE 5-2-8 86/ar '

\/ THESE CONTACTS CLOSE UPON A REACTOR TRIP es-t sK RT \

1:

amuwn 'N LOOP 1 MAIN FW VALVE IN AUTO 6MMWS ','

LOOP 1 STARTUP FW VALVE IN AUTO 6msM N LOOP 2 MAIN FW VALVE IN AUTO emeFws N LOOP 2 STARTUP FW VALVE IN AUTO l

.1 66 00 00 00 g, RFR RFR RFR 1 2 -.

1 RFR ACTUATION C0lLS (ENERGlZE TO ACTUATE) l l

-- - - - - . . -- . . . . . ~ - . - . . - . . _ . .- .-.-.-----.l

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