ML17339A466

Forwards Responses to NRC Re Lessons Learned Task Force Recommendations,Items 2.1.7.a & 2.1.7.b.Auxiliary Feedwater Sys Is Automatically Initiated Except for Steam Generator Level Maint

ML17339A466
Person / Time
Site:	Turkey Point
Issue date:	01/14/1980
From:	Robert E. Uhrig FLORIDA POWER & LIGHT CO.
To:	Schwencer A Office of Nuclear Reactor Regulation
References
RTR-NUREG-0578, RTR-NUREG-578 1-80-22, NUDOCS 8001220418
Download: ML17339A466 (12)

Text

REGULATORY INFORMATION DISTRIBUTION SYSTEM (HIDS)

ACCESSION NBR:8001220418 DOC~DATEe 80/01/14 NOTARIZED NO FACIE;50-250 Tur key Point Planti Uni t 3i Florida l ower and Light C

50-251 Turkey Point Planti 0nit 4i glor ida I ower and Light C

AUTH ~ NAME AUTHOR AFFILIATION UHHiGsHeE ~

Florida Power L Light Co, HECIP,NAME, RECIPIENT AFFILIATION SCHAE,ACEHgA ~

Operating Heactois Branch DOCKET 05000250 05000251

SUBJECT:

Forwards responses to NRC 791212 ltr re Lessons Learned Task Force r ecommendations~ Items 2,1,7

~ a 8

? ~ 1,7,b,Auxi l iary feedwater sys is automatically initiated except for steam generator level maint.

DISTRIBUTION CODE.:

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FLORIOA POWER & LIGHTCOMPANY January 14, 1980 L-80-22 Office of Nuclear Reactor Regulation Attention:

Mr. A. Schwencer, Chief Operating Reactors Branch kl Division of Operating Reactors U. S. Nuclear Regulatory Commission Washington, D.

C.

20555

Dear Mr. Schwencer:

Re:

Turkey Point Units 3 8 4 Docket Nos.

50-250 and 50-251 Auxiliar Feedwater S stem The attached information is submitted in response to your letter of December 12, 1979 regarding Lessons Learned recommendations

2. 1.7.a and 2.1.7.b.

The referenced blue prints are being duplicated and will be forwarded when available.

Very truly yours, Ro ert E. Uhrig Vice President Advanced Systems 8 Technology I

REU/MAS/RJA/ah Attachments 3

cc:

J.

P. O'Reilly, Region II Harold F. Reis, Esquire 8OOrsSO+i%>

PEOPLE... SERVING PEOPLE

~

~

ATTACHMENT 1 Re:

Turkey Point Units 3

a 4

Docket Nos.

50-250 6 50-251

'uxiliary Feedwater System Lessons Learned Xtem 2.1.7.a S stem Descri 'tion The auxiliary feedwater system (AFNS) for the Turkey Point plant (Units 3

6 4) consists of three steam turbine driven pumps.

All.

three pumps are aligned to deliver feedwater to all three generators of either unit.

Each pump normally delivers 600 gpm (92775 ft. head) feedwater to the three steam generators (SG) in each unit.

The control room operator can manually direct flow from the pumps to any one or all three steam generators of either unit.

Under a design basis accident, only one pump. would be required in order to cool that plant down to a condition where the RHR system can be put into operation to continue the safe plant shutdown process.

Primary water supply for the AE%S comes from the seismic Category condensate storage tanks (CST) of both units.

Each CST has a capacity of 250,000 gallons with a minimum reserved storage capacity of 185,000 gallons of demineralized water.

With this quantity of 'water, the unit can be kept at hot standby'ondition for 15 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br /> and then

.cooled to 350 F, at.which point the RHR system can be,put: in service, or the unit can be kept at hot standby condition for about 23 additional hours.

All the manually operated valves associated with CST's are locked open.

A secondary water supply comes from the non-seismic Category I water treatment system.

An additional feedwater supply can. be provided from the main feedwater system of the adjacent Units'1 6

2 (non-nuclear power plant).

Components Desi n, Classification The AFNS is designed according to seismic Category I requirements.

The AFNS is classified as an engineered safety related system and its associated instrumentation and controls are designed accordingly.

Power Sources The turbine driven pumps are supplied with steam from the main steam line of either or both units upstream of 'the 11SXV.

The AFN auto, initiation system selects the steam supply from the Unit which has lost its normal feedwater supply.

The turbines have an atmosphere exhaust.

Steam can also be manually supplied from the Unit having normal feedwater supply and from an auxiliary steam system connection to Units 1

6 2.

The turbine driven pump steam supply line has a

normally closed.AC motor operated valve in series with a normally closed DC solenoid air operated pressure control valve.

The pump

~ ~

discharge control valves are DC solenoid/air operated valves.

The air supply for all valves are backed by a seismically qualified nitrogen supply that automatically initiates on loss of normal air.supply.

Controls

\\

The steam generator water level is manually controlled by the control room operator using either one or all of the DC solenoid/air operated flow control valves by setting the required flow on the flow indicator located in the control room.

Local manual operation of these valves can be performed in the unlikely event of loss of all instrument air.

The APW pump feedwater discharge rate is always greater than the turbine steam consumption when the steam pressure is higher than 120 psig.

When the steam pressure is reduced to 120 psig, the RHR system is started and the AFW pumps are shut. down.

Information Available to Operator Low.water level in the condensate storage tank. will alarm and annunciate in the main control room.

In addition, AFW flow indication, SG water

level, and control valve position demand signal indication are provided in the control room.

Initiatin Si nals for Automatic Operation All three APH pumps will automatically start by any of the following signals:

(a) safety injection (b) low-low water level in any of the three steam generators (c) loss of voltage on both 4160V buses (d) loss of both main feedwater pumps Any one of these signals will automatically open the normally closed motor operated valve and air operated pressure control valve in series which isolate the main steam line from the steam supply header of each APN pump turbine.

Air to operate the AFN flow control system to the steam generators is supplied when the steam supply valves commence opening.

The AVIS can also be started manually in the control room or from the local station.

Criteria Com liance 1.

NRC The design shall provide for the automatic initiation of the auxiliary feedwater system.

FPL As shown in the preceding description, the AFWS is auto-matically initiated.

Any one of the following

signals will initiate the automatic opening of the*

steam supply valves and auxiliary feedwater control valves.

l.

2.

3.

4.

safety injection low-low level in any of the three steam generators loss of voltage on both 4160V buses loss of both feedwater pumps under normal operating conditions.

However, the feedwater regulator valves in the system as historically operated are normally closed and are modulated by operator action from 'the Control Room to maintain steam generator level.

The Auxiliary Feedwater System has been operated with the feedwater regulator valves normally closed because it. was felt the pumps performed better that way.

In order to provide fully automatic flow initiation, one of the two alternatives listed below will be taken:

1)

The system will be modified so that the auxili'ary feedwater control valves will be automatically opened to a predetermined position after a short time delay sufficient to enable the turbine driven auxiliary feed pump to attain full speed, or 2)

The normal lineup of the system will be changed so that the auxiliary feedwater-control valves will be normally open a

preset predetermined amount so that feed flow to the steam generators will be initiated with no operator action when-ever the auxiliary feedwater pumps are started.

The action will be completed on Unit 3 prior to startup following the

'efueling outage now in progress.

The action will be completed on Unit 4 prior to February 15, 1980.

2.

NRC The automatic initiation signals and circuits, shall -be designed so that a single failure will not result in the loss of auxiliary feedwater system function.

FPL All initiating signals are derived from redundant sources powered from separate power supplies.

The safety injection and steam generator level signals are 2/3 logic.

All DC powered solenoid valves that must energize to initiate or control AFN are redundant.

and powered from separate battery backed buses.

The normal air supply for pneumatic valves are backed.

with a seismically qualified nitrogen supply.

~

~

. ~

3.

NRC Testability of the initiating signals and circuits shall be a feature of the'design.

FPL The Turkey Point, Technical Specifications require that each AFW pump be tested once each month.

Since three AFW pumps are shared by two units,. each pump is normally tested twice a month (assuming both units are operating).

Auxiliary feedwater flow is initiated by manually opening valves

.(from the Control Room) to admit steam to the AFW pump turbines and thereby establish AFW flow to the steam generators.

Testing of initialling signals and circuits is performed. during each Integrated Safeguards Test (performed during refueling outages).

There are normally two refueling outages per year at Turkey Point (one outage per year for each of the two nuclear units).

4.

NRC F.PL The initiating signals and circuits shall be powered from'the emergency buses.

As stated in (2) above, all signals and circuits are supplied from redundant vital power sources.

5.

NRC blanual capability to initiate the auxiliary feedwater system 'from the control room shall be retained and shall be implemented so that a single failure in the

'anual circuits will not result 'in the loss of system function.

p The manual capability to initiate the AFWS even with a single failure has been maintained.

6.

NRC The AC motor driven pumps and valves in the auxiliary

'eedwater system shall be included in the automatic actuation (simultaneous and/or sequential) of the loads onto the emergency buses.

The only components requiring AC power to initiate AFW are the Steam Stop valves to the turbines.

These valves are connected to a vital bus and are auto-matically loaded onto the diesel generators.

7.

The automatic initiating signals and. circuits shall be designed so that their failure will not result in the loss of manual capability to initiate the AFWS from the control room.

The AFWS is designed so that manual capability to initiate AFW is maintained even with failures in either the initiating signals or circuits.

~ ATTACHMENT 2 Re:

Turkey Point Units 3

G 4

Docket Nos.

50-250 6 50-251

-Auxiliary Feedwater System Lessons Learned Xtem 2.1.7b S stem Descri tion Each steam 'generator has an existing flow indicating loop consisting of orifice plate/flanges, pneumatic transmitter, square root extractor, and indicators local to the pump and on the main control board.

Components Desion Classification

.The auxiliary feedwater flow indication system is designed according to seismic Cateoory X requirements.

Power Sources The auxiliary feedwater flow indication system is a pneumatic

system, therefore, it does not require electrical power.

To provide the equivalent of vital power, a seismically'ualified nitrogen s'upply is used as a backup to the normal instrument air system.

Upon a loss of normal air. supply the nitrogen supply wj.ll automatically maintain flow indication.

Criteria Compliance 1.

NRC Auxiliary feedwater flow indication to each steam gen-erator shall satisfy the single failure criterion.

FPL The auxiliary feedwater flow indication system is backed by level indication on each steam generator.

2.

NRC Testability of the auxiliary feedwater flow indication, channels shall be a feature of the design.

FPL Xndication of 'AFW system'flow to the steam generators is tested by operating a pump, establishing the required flow, and checking the pump performance parameters for consistency with the indicated flow.

Xf an inconsistency'xists, the instrumentation is checked/calibrated.

This is the normal procedure for the monthly pump runs, then the flow instrumentation is checked during each pump test.

3.

NRC Auxiliary feedwater flow instrument channels shall be powered from the vital instrument buses.

FPL No electrical power is required for the auxiliary feedwater flow indication.

Eouivalent vital power is supplied by a seismically qualified nitrogen backup to the normal air supply for the pneumatic indication system.

The nitrogen supply is automatically initiated upon loss of, normal air.

~ ~

4.

NRC Each auxiliary feedwater channel should provide an z.ndication of feed flow with an accuracy on the order of

+ 10%.

PPL The auxiliary feedwater flow indication system supplies an indication of feed flow with an accuracy of better than

+ 10%.

ATTACHf1ENT 3 Re:

Turkey Point Units 3

& 4 Docket Nos.

50-250

& 50-251 Auxiliary Feedwater System Drawin References 2.1.7.a

& 2.1.7.b Electrical Schematics for Auxiliary Feedwater (attached) 5610-E-26 sheet 12 5610-E-26 sheet 12A'610-E-26 sheet 128 P&I drawings for Steam Supply System including Auxiliary Feed~>ater (see FSAR)

Figure 10.2 Figure 10.2-2 One lone electrical diagram (see FSAR)

Figure 8. 2-3 Figure 8.2-4a Figure 8.$ -4b Vital power - nitrogen supply back-up (attached) 5610-N-339/79-112 (Pr'eliminary)

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