ML20141N147

Rev 0 to Procedure RES-OP-002,0 Operator Training:Rapid Feedwater Reduction

ML20141N147
Person / Time
Site:	Davis Besse
Issue date:	12/31/1985
From:	Caspersen G TOLEDO EDISON CO.
To:
Shared Package
ML20141N145	List: ML20141N144 ML20141N147 ML20141N150 ML20141N153 ML20141N156 ML20141N160 ML20141N163 ML20141N168 ML20141N172 ML20141N176 ML20141N179 ML20141N180
References
1242, RES-OPS-002.00, RES-OPS-2.00, TAC-61015, NUDOCS 8603040415
Download: ML20141N147 (7)

Text

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RES-OPS-002.00 Program Title OPERATOR TitAINING Course

Title:

1985-1986 Restart Training Les_sen

Title:

" RAPID FEEDWATER REDUCTION Accrox. Times 1 Revision No.: 00 Date: 8512 Resource Materials for the Instructor Jon Aids:

N/A Audio / Visual Equipment Needed:

CVETHEAD PROJECTOR List of Transparancies:

RES-OPS-00 2.1 THRU RE5-OPS-002.4 Tools / Equipment:

N/A Safety Requirements:

N/A Instructional setting:

CLASSROOM Student Materials:

PEN OR PENCIL, PAPER, HANDOUTS Special Considerations:

N/A Instructor

References:

SP 1105.05, USAR - SECTION 7.7, INSTAUCTIONS BOOK FOR INTEGRATED CONTROL SYSTEM, TOLEDO EDISON DRAWING 8 26206-26228, TCR-200 REV. A Student

References:

SP 1105.04, USAR - SECTION 7.7

OBJECTIVES RES-OPS-002.00 O BJ ECTIVE . O NECTIVE TEXT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

NUMBER 0 OPERATE AND MONITOR THE RAPID FEEDWATER REDUCTION PORTION OF THE INTEGRATED CONTROL SYSTEM.

00 THE FOLI4 WING ENABLING OMECTIVES ASSOCIATED WITH THIS 'JSSON PLAN ARE DESIGNED TO SUPPORT THE

" KNOWLEDGE" REQUIREMENTS FOR THE ABOVE TERMINAL OMECTIVE.

000 THE STUDENT, WITHOUT REFERENCES UNLESS OTHERWISE SPECIFIED), ACCORDING TO APPROVED PROCEDURES, WILL BE ABLE TO:

01 STATE THE PURPOSE OF RAPID FEEDWATER REDUCTION.

02 IDENTIFY THE CONDITIONS THAT NOULD RESULT IN A RAPID FEEDWATER REDUCTION ACTUATION.

03 DESCRIBE THE FEEDWATER RESPONSE DURING A RAPID FEEDWATER REDUCTION ACTUATION. '

t 04 DESCRIBE HOW A RAPID FEEDWATER REDUCTION ACTUATION IS TERMINATED.

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RAPID FEEDWATER REDUCTION RES-OPS-002.00

1.0 INTRODUCTION

A. The' Rapid Feedwater Reduction portion of the Integrated Control System is responsible for ensuring proper feedwater response during a reactor trip from power.

2.0 PRESENTATION The Rapid Feedwater Reduction (RFR) controls the A.

speed of the Main Feedwater Pumps and the position of the Main and Starteup Feedwater Control Valves following a reactor trip from power, to ensure proper Feedwater response.

B. Description

1. Conditions necessary to initiate a rapid i

feedwater reduction i

a. At least one MFP not tripped 4

b. All control valves in auto j c. RFR defeat switch in "on" position j d. Reactor Trip '

i 2. Initiation Circuitry

, TP 2

a. When il or #2 MFP are reset then either contasct 86-1/AFWPT or 86-1/BFWPT will be closed.

)

b. When the RFR defeat switch is on then switch RFR/DEF will be closed.

! c. When all four (4) Feedwater control 1

valves are in auto then contacts i

62X/AFWN, 62X/AFWS, 62X/5FWS, and i

s 62X/BFWN are closed.

d. A reactor trip then closes contacts l 86/RT and 86-1/RT.

j e. When the above contacts are closed the 4

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RAPID FEEDWATER REDUCTION RES-OPS-002.00 following relays are energized 86/RFR, t

86/R?R-1, 86/RFR-2, and 86/RFR-3. '

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f. When 86/RFR-2 is energized it closes 4

contact 86/RFR-2 which seals in the actuation signal even if the valves are j then taken out of auto.

3. Main and GU control valve actuating circuitry TP 3

a. When 86/RFR is energized it closes 2

contact 86/RFR

) b. As'long as no OTSG low level exists and

<2.5 minutes have elapsed since the i trip, relays 86/0LCA, 86/otcA-1, 86/0LCB, and OLCB-1 will be energized

1) This causes contacts to position such that the transfer devices T15 and T14 select a target position l for their input i i l 2)~ This provides a closed signal to the TP 4 i

main control valves and about a 17%

i open signal to the startup control;

) valves.

4. Main Feed pump actuating circuitry l

l a. When 86/RFR and 86/RFR-2 are energiz6d it TP 4 i

causes contacts to position such that l the transfer device T-11 is selected to j a target speed of about 4600 RPM.

l l' b. It also selects a zero modifying signal l

! instead of valve D/P as long as no low

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3 level limit exists. .

j 5. Low Level Control Circuitry j a. Once low level limits are reached the i

27RR/LLA and 27RR/LLB contacts change -

l position. TP 3

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1) This deanergises relays 86/oLCA, 86/oLCA-1, 86/OLCB, and 86/0LCB-1 I,

2-I i

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RAPID FEEDWATER REDUCTION RES-OPS-002.00 which causes transfer devices T14 l and T15 to transfer back to the feedwater demand signal which is on level control

2) This also energizes relays 86/ALCP, and 86/BLCP which cause T13 to select level control instead of a zero error signal. TP 4 a) This results in feedpumps being targeted at - 4600 rpm and then that signal being modified by level control

error

6. 2.5 minute time control circuit

a. If no low level has occurred before 2.5 minutes has elapsed then Relay 62/LLTB i will open the 62'LLIa f 111 we... tr.e 1

i contacts doenergizing relays 86/0LCA, 86/OLCB, and 86/OLCB-1 TP 3

1) This causes transfer device T14 and i

T15 to transfer back to the feedwater TP 4 demand signal.

2) This results in the valves being once again controlled by feedwater

.; demand.

3) This time delay has no effect on i the main feedwater pumps.

7. Signal Lag Modules j a. Main Feed Pumps

! 1) A signal lag module set at a time constant of - 18 seconds exists in the RFR feed pump circuit.

2) When RFR is actuated instead of a step TP 4 change in MFPT speed to its target position the time lag module filters the signal to provide a 3-1 l

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1 RAPID FEEDWATER REDUCTION RES-OPS-002.00 speed change in a smooth controlled fashion.

b. FW Control Valves

1) A signal lag module set at a time constant of - 4.5 seconds exists in the RFR control valve circuit.

32) When RFR is actuated the Main and TP 4 Startup control vslves change position in a smooth, controlled

' fashion from their pretrip position to their post-trip, target position.

3.0

SUMMARY

A. Proper actuation of RFR is indicated by both main FW valves going shut and both startup FW valves closing to about 174. The MFP's will target their speed to - 4600 rpm.

B. RFR will remain activated for - 2.5 minutes or until low level limits have been reached, which ever occurs first.

1. If low level limits have been reached on one (1) loep and not,the other while RFR is still activated, the loop / reaching low level limits will go on level control and the other will remain on RFR until low level limits have been obtained or 2.5 minutes have expired at t

which time it will go on level control.

4.O EVALUATION '

5.0 ASSIGNMENT A. None required for this lesson.

4-1 YV

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