ML20198A371

Requests Info by 851023 Re Event Outlined in ACRS ,Including NRC Response to Ltr,Staff Responsible for Investigation & Dates Rept to Commission & Response to ACRS Will Be Available

ML20198A371
Person / Time
Site:	Turkey Point
Issue date:	10/16/1985
From:	Palladino N NRC COMMISSION (OCM)
To:	Dircks W NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO)
Shared Package
ML20197K090	List: IA-85-729, Further Response to FOIA Request for NRC Insp Rept & Related Records Re Evaluation of Auxiliary Feedwater Sys.Documents Listed on Encl App Available in Pdr.Search for Addl Document Continuing ML20197K085 ML20197K118 ML20198A364 ML20198A368 ML20198A371 ML20203H152
References
FOIA-85-729 NUDOCS 8511010436
Download: ML20198A371 (23)

Text

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A UNITED STATES 8

NUCLEAR REGULATORY COMMISSION o

e E WASHINGTON, D. C. 20555 7,

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October 16, 1985 MEMORANDUM FOR:

William J. Dircks v Executive Director for Operations FROM:

Nunzio J. Palladino

SUBJECT:

SEPTEMBER 20, 1985 LETTEW ROM ACRS ON TURKEY POINT The subject letter, copy enclosed, points;out a major concern of the ACRS that could have substantial regulatory impact'.'

Please indicate to the Commission by October 23, 1985, (a) what

~

actions the staff has underway with respect to the ACRS letter; (b) what priority and staff resources have been assigned to explore the deeper implications of the event; and (c) when a report to the Commission and a response to the ACRS will be ivailable.'

Attachment:

As state cc:

Commissioner Roberts

~

Commissioner Bernthal Commissioner Zech Commissioner Asselstine OGC OPE SECY ACRS Rec'd Off. EDO Date... /.D.;),7,;

i Time..., /M.%

I N

001101 EDO

e.

s e

s FLTCt!A PQWER & LIGHT COMPANY INTER OFFICE CORRESPONDENCE PTP-TRN G-83-033 Turkey Point Pit-N 4.OCATION To W. C. Miller oATE January 31,1983 c.,o u Leo Goebel coes To D. W. Haase V. B. Wager suaaccT AFW SYSTEM UPGRADE J. A. Labarraque Licensed Opers.

Nuc Turb Opers..

File This training brief is presented as an effort to familiarize IIcensed operators and Nuclear Turbine Operators with the modiffeations being made to the Auxiliary Feedwater System.

As modifications are completed en Unit #3 and Unit #4, an updated training brief will be forwarded by the Nuclear Training Department.

& 4 :L 11 Leo Goebel j

LG:dj e

r/s

AUXILIARY FEEDWATER SYSTEM UPGRADE This training brief describes the modes of operation for the upgraded Auxiliary Peedwater System, including the following modifications:

(1)

New High pressure auxi!Iary feedwater pump turbines

.(2)

Autcmatic auxiliary feedwater flow control (3)

Safe:y grade flow indication (4)

D.C. motor operators for auxiliary feedwater turbine steam supply valves (5)

Redundant steam supply lines (6)

Redundant auxiliary feedwater pump discharge piping L

NEW AUXILIARY FEEDWATER PUMP TURBINES The replacement auxiliary feedwater pump turbine operates similar to the existing turbines with the following exceptions:

A.

The pressure reducing valve and relief valve prior to the turbine has been removed and the turbine operates on full main steam line pressure.

IT B.

The turbine governor is provided with a 30-second ramp rate bushing to prevent the turbine from overspeeding on a quick start.

C.

The turbine has an electric overspeed trip' which is set at a lower speed (6200 RPM +50) than the mechanical overspeed trip (6500 RPM + 50). Gr80 The electronic overspeed trip can be remotely tripped or reset from either the control room or the local panel. The electronic trip will automatically reset on an auxiliary feedwater auto start signal.

D.

Control Board Modifications (Fig.1)

The following is a brief description of the T & T Valve indications and control switch on the console:

i (1)

The console control switch is a three position switch which generates an "open" signal when turned " clockwise", generates a "close" signal when turned " counter-clockwise" and spring returns to "mid" position for " auto-operation".

(2)

,j The standard " green" light indication for " closed" and " red" light indication for "open" is provided.

j (3)

" Amber" light Indication for a " mechanical trip" is provided to 1

alert the operator that the latch mechanism must be " manually"

}

reset to allow further operation.

i (4)

" Amber" light indleation for an " electrical trip" is provided, but l

manual action is not required as " electrical trip" will automatically reset.

(5)

" Amber" light Indication for system test is provided and will j

lliuminate when the key switch on the local panel is turned to M u d ".

L

! ). '

(6)

" White" light indication is provided from " normal" operation and 9

indicates key switch on local panel is turned to " remote" allowing operation from console.

l Initiation and other controls asociated with the auxiliary feedwater turbine remain the same.

i NOTE:

When an auxiliary feedwater pump /t. tine is tripped manually, i

the turbine will not automatically reset.

i The Lube Oil Cooling systert for the auxiliary feedwater pump / turbine is j

supplied with cooling water fr:m the second stage auxiliary feedwater pump volute vent.

Backup cooling water supply is provided by service water i

through a quick connect flex h:se.

f 4

IL AUTOMATIC AUXILIARY FEEDWATER FLOW CONTROL (Fig. 2) l A.

When the Auxiliary Feedwater System is in standby mode (auto), the console hand indicating controllers are set to a predetermined flowrate dictated by Tech. Specs, and plant operating procedures. However, the i

controner output signal to the flow control valve is blocked by a i

solenoid valve which interrupts the instrument air supply to the

)

auxiliary feedwater flow control valve.

With no signal from the controller, the aux 111ary feedwater flow control valve is in the closed position. See the attached drawing of Auxiliary Feedwater Control System.

B.

On an auxiliary feedwater initiation signal, auto or manual, an open j

signal is applied to the instrument air supply solenoid valve.

This permits a fun output signal from the auxiliary feedwater controller to be applied to the auxiliary feedwater flow control valve and the valve is i

driven fully open.

NOTE:

A long term error signal is produced between the controHer setpoint and the "O" GPM flow measurement which results in the i

j

" wind-up" of the proportional plus reset controller. This results in the reset circuitry being charged with a signal sufficient to drive j

the valve funy open.

1 i

C.

Under normal conditions, the auxiliary feedwater discharge IIne will pressurize until enough head is generated to open the check valve and l

start flow to the steam generator. The increasing flow rate will be i

sensed by the flow transmitter and its output signal will increase affecting the controner balance and unwinding the reset. The flow controller win initiaHy overshoot the flow setpoint then decay to control flow at the preset value.

I l

i I

l

}

EL SAFETY GRADE FLOW INDICATION (Fig. 3)

I The purpose of the auxiliary feedwater flow indicator modification is to replace the pneumatic flow indicators with safety grade electric flow indicators.

4 i

A.

The flow transmitters transmit a 4 to 20 MA signal to converters installed in the cable spreading room. This signsl is re-transmitted to i

the console mounted indicators and local mounted indicators.

This '

~,

system is powered by new redundant 120 volt vital A.C. sub panels.

I B.

Each steam generator auxiliary feedwater line, train #1 and train #2, has a flow element and flow transmitter on Unit #4.

The #3 modification has not been completed and at present, the train #1 and train #2 flow indicators share a common flow element. See attached drawing.

IV.

D.C.

MOTOR OPERATORS FOR AUXILIARY FEEDWATER TURBINE j.

STEAM SUPPLY VALVES (Fig. 4)

The AC motor operators have been replaced with D.C. motor operators on the following auxiliary feedwater turbine steam supply valves, MOV-4-1403 i

j and MOV-4-1405.

This modification provides electrical, as well as mechanical, redundancy with train #1 and train #2 Auxiliary Feedwater i

Systems. Train #1 supplies steam to the "A & C" auxiliary feedwater pumps l

and train #2 supplies steam to the "B" auxiliary feedwater pump.

A.

The initiation and control circuitry and operation of the valves have not been changed.

However, with the addition of the redundant steam j

l supply lines, it is important to maintain the proper valve lineup to assure electrical separation of the redundant trains, j

V.

AFW REDUNDANT STEAM SUPPLY AND PUMP DISCHARGE LINES (Fig. 5) i j

The valve lineups shown on the attached drawings shall be maintained when the Auxillary Feedwater System is in the standby mode and both units are operating. This lineup assures redundant flow paths of steam to the auxiliary feedwater pump turbines and auxiliary feedwater flow to the steam l

l generators.

j A.

The system is automatically actuated and requires no operator action to j

maintain flow to the steam generators. In the event of a line break in i

t either the auxillary feedwater pump turbine steam supply or auxiliary feedwater pump discharge, there are adequate isolation valves provided to isolate the break and maintain flow to the non-affected steam generators.

i j

B.

In the event of one unit being down and one auxiliary feedwater i

pump / turbine out of service, it is important to assure that the l

temporary valve lineup maintains electrical as well as mechanical l

redundancy and separation.

6 1

I 1

i I

i

4*

The Auxiliary Feedwater System modifications described in this training brief are appilcable to Unit #4 only. These modifications will be completed on Unit #3 during the next outage. Until such time, the Unit #3 Auxiliary Feedwater System will operate as it has in the past with the exception of the "B" and "C" auxiliary feedwater pump turbine controls.

The attached prints for Auxiliary Feedwater System steam supply, Auxiliary Feedwater System feedwater discharge, Auxiliary Feedwater System controls and list of Auxiliary Feedwater System power supplies are not controlled documents and are presented for training purposes only.

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. 00Vrm:0R_ (Woodward Type PG-PL 6 PG-A) gg.jgverndt 2ontrsniturhinrsjiesdScontroinng'.ithPa3ourit; of.stcanUt p~o Eh'e*6Trb fne 2 15pMcon troI'Is'3Ebchronons ';4.wh gyVEm por JITI'shfnU.iC.c2nuit; gilt _.t.prb.ine,$teadutate_ spted, w11Jgia1, gfF3 ggytthe;;unitrJenniless of -load.

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@e JoYgM.Tof'the zisch4"hAfdrgulig.. type. driven by%

Wnf.Thgm CICIPiraldeductiog gears, We gors;crorJagt;a.insr~a 'p~iir~6Fe 7tWTnid5 aid'Eserv5Ff5qvrmg=

M.Under_prn5TQr~s~di'tTie reidtiler~vo.Tititc'rrial sp~ringTetN

'~ irrs saintz2n.3t1Ypssure.'.and,agg actAiei,yalves.. -

4 TTTiring35adMQeetihiesf h9 weight.2end ailsembifl 'is' tituW~ val ve% shin g ;2The 'D f5Teigh Gic ad ip ezites_N Mr ch5tr~n1-d"'aW w_.i.r.d-frur th e-remot.e _ servey The governor remote servo is of the differentini type, having a differen-tial power cylinder asse=bly.

Oil under constant pressure is maintained on the s=allest surface area of the servo piston.

Oil, acting on the largest surface area of the piston, is either under supply pressure, to dr:.in or locked according to the position of the pilot valve.

The action of the servo is a " push-pull" motion.

In this appliention, i

novement of the servo rod in an upwcrds direction causes a decrease in tur-bine speed, whereas, a downward mover.ent will cause an increase in speed.

For more specific details of the governor operation and maintenance, refer to the ifoodward Governor bulletins in this section.

l The function of the governor is to sense and control turbine speed over a varying range, maintaining speed constant with varying load for any set-ting. The governor is designed to meet the operating requirements of the 4nstallation as long as the load does not exceed design capacity.

The operating speed can be varied either by local manual setting or by varying a pneumatic signal to the governor from a re=ote control position.

h,,ot e :

anual operation is not to be used in honjunction with pneusatic or vice versa.

l TERRY CORPORATION S.I.C.S. Sect. 6 Rev. 0-76 L

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SPECIAL GOVERNOR MECilANISM PEATURES T

GENERAL I

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metering po,rt, oil is permitted to drain from the cylinder.sgg;3BE:l

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I This allows the piston spring to raise th*e piston, decreasing speeder spring force and thus lowering the spring setting.

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I ACCELERATION CONTROL

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rate of oil flow to the speed setting cylinder.

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ne longer rates are generally used with turbo-supercharge units to permit the supercharger to accelerate with the engine. The rate'of movement of

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has an additional land (not, illustrated) which covers the drain

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rate at which the oil is allowed to drain from the speed setting cylinder.

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DANIEL MCDONALD NRR-FM AFW EVENT 7/22/85 TURKEY POINT PLANT AUXIL-IARY FEEDWATER SYSTEM ORIGINAL SYSTEM AND DESIGN BASIS CURRENT DESIGN BASIS SUPPLY 373 GPM TO SINGLE UNIT WITH AC POWER AVAILABLE-SUPPLY 286 GPM TO EACH UNIT WITH LOSS OF AC POWER SYSTEM MODIFICATIONS - POST TMI-AUTOMATIC SYSTEM INITIATION REDUNDANT FLOW INDICATION REDUNDANT LEVEL ALARMS ON THE CSTS TWO SEPARATE FULL FLOW CAPACITY AFW TRAINS REDUNDANT N SUPPLIES TO FLOW CONTROL VALVES 2

DIVERSE POWER SUPPLIES TO FLOW INLET MOVS (AC & DC)

HIGH PRESSURE TURBINES AND TRIP / THROTTLE' VALVES NON-SAFETY SG FEED PUMPS TWO 850 GPM PUMPS 500,000 GALLON DWST AFW EVENT FOLLOW-UP ACTIONS - NRC STAFF IMMEDIATE CORRECTIVE ACTIONS DEVELOPING.IE INFORMATION NOTICE FPL COMMITMENT TO TEC,H. SPEC. THE NON-SAFETY SG FEEDPUMPS.

SURVEY OF FPL MAINTENA'NCE PROGRAM BY NRR TEAM PROPOSED GENERIC LETTER REQUIRING UPGRADE AT SOME PLANTS.

LETTERS TO THE COMMISSION AND ACRS AFW EVENT FOLLOW-UP ACTIONS LICENSEE IMMEDIATE PROCEDURE CHANGES INTERIM AND LONG TERM CORRECTIVE ACTIONS SPECIAL IE TEAM INSPECTION OF AFW SYSTEM F/6 st_.

o.

AUXILIARY FEEDWATER SYSTEM l

PRESENT DESIGN TWO SEPERATE FULL FLOW CAPACITY AFW TRAINS.

CAPABLE OF SUPPLYING 373 GPM TO ONE UNIT FOR LOSS OF NORMAL FEEDWATER.

CAPABLE OF SUPPLYING 286 GPM TO EACH OF TWO UNITS FOR LOSS OF OFFSITE POWER (RCP'S STOPPED).

EACH UNIT MAINTAINS A SUPPLY OF 185,000 GALLONS OF DEMINERALIZED WATER IN ITS CONDENSATE STORAGE TANK.

SYSTEM AUTOMATICALLY INITIATES ON THE FOLLOWING SIGNALS:

1.

SAFETY INJECTION 2.

LOW-LOW LEVEL IN ANY OF THE THREE STEAM GENERATORS 3.

BUS STRIPPING 4.

LOSS OF BOTH FEEDWATER PUMPS UNDER NORMAL OPERATING CONDITIONS.

SYSTEM IS DESIGNED TO REMAIN FUNCTIONAL FOLLOWING A SAFE SHUTDOWN EARTHQUAKE AND MEET MISSILE PROTECTION CRITERIA.

1

O AUXILIARY FEEDWATER SYSTEM O

CURRENT ENGINEERING PROJECTS REA-TPN 85-30 AUXILIARY FEEDWATER SYSTEM DESIGN REVIEW AND OPTIMIZATION 1.

MINIMIZE AFW FLOW CONTROL OSCILLATION 2.

AFW. TECHNICAL SPECIFICATION REVISION 3.

AFW GOVERNOR PERFORMANCE 4.

UPGRADE OF AFW FLOW CONTROL VALVE NITROGEN SUPPLY LINES 5.

AFW T&T VALVE SWITCHES AND LOCAL INDICATING LIGHTS 6.

DESIGN BASIS DOCUMENT 7.

AFW-NITROGEN BACKUP SYSTEM 8.

AFW SYSTEM ACCESSIBILITY 9.

AFW SYSTEM STEAM LEAK 0FFS 10.

AFW-AFP RPM MONITORING 11.

AFW-ELECTRICAL CONDUIT REROUTE 12.

AFW-REMOVAL OF OBSOLETE EQUIPMENT 13.

SINGLE FAILURE ANALYSIS 14.

MISALIGNMENT OF AFW 15.

AFW-AUXILIARY OIL PUMP 16.

AUXILIARY FEEDWATER SUPPLY FROM THE DWST

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