ML19270H610

Tech Specs Revision for Isolation of Main Steam Lines

ML19270H610
Person / Time
Site:	Browns Ferry
Issue date:	12/05/1979
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML19270H609	List: ML19270H608 ML19270H610
References
NUDOCS 7912130508
Download: ML19270H610 (20)

Text

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UNITS 1 AND 2 PROPOSED CR\NGES L - e L. -w 7912130 g

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1.0 DEFINITIONS (Cont'd)

V. Instrumentation

1. Instrument Calibration - An instru:nent calibration mesna the adjustment of an instrument signal output so that it corresponds, within. acceptable range, and accuracy, to a known value(s) of the parameter which the instrument monitors.

2. Channel - A channel is an arrangement of a sensor (s) and asso-ciated components used to evaluate plant variables and pro-duce discrete outputs used in logic. A channel terminates and loses its identity where individual channel outpute are combined in logic.

3. Instrument Fun:tional Test - An instrument functional test means the injection of a simulated signal into the instrument primary sensor to verify the proper instrument channel response, alarm and/or initiating action.

4 Instrument check - An instrument check is qualitativa deterisina- m tion of acceptable operability by observation of instrtssent behavior during operation. This datermination shall include, where possible, comparison of the instrsement with other indepen-dent instrumente measuring the same variable, v 5. Logic System Functional Test - A 1cgic system functional test means a test of all relays and contacts of a logic circuit to insure all componente are operable per design intent. Where practicable, action will go to completion; i.e., pumps will be started and valves operated.

6. Trip System - A trip system means an arrangement of instrument channel trip signale and auxiliary equipment required to initiate action to accomplish a protective trip function. A trip systes may require one or more instrument channal trip signals related to ons or more plant parameters in order to initista trip system action. Initiation of protective action may require the tripping of a single trip system or the coincident tripping of two trip systems.

7. Protective Action - An action initiated by the protection system when a limit is reached. A protective action can be at a channel or system level.

8. ProtectiveFunction-Asyntesprotectiveactionwh'ifh"results"j170] 77 from the protective action of the channels monitoring a parti-cular plant condition. '

9. Simulated Automatic Actuation - Simulated automatic actuation means applying a simulated signal to the sensor to actuate the circuit in question.

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Instrument

• Channels Operable per Trip Sys(1) Function Trip Le.el Settine Action (1) Remarks 2 (10) :netrunent cw=-"a' -

< 2000F 3 1. Above trip setting initiates

, Main Steam Line Tunnel Main Stean Line Isolation High Tempercture 2 :nstrument Channel - 160 - 18CCF C ' - Above trip setting initiates Reactor Water Cleanup Isolation of Reactor 'n'ater Systen Floor frain High Cleanup line from Reactor and Temperature Reactor '<.'ater Return Line.

2 Instrument Channel - 160 - 1800? C 1. Sanc as above Reactor Water Cleanup Systen Space High yn Temperature es 1 Instrument Channel - ~

< 100 .r/hr or devnscale G 1. 1 upscale or 2 devnscale vill Reacter Building t'enti- a. Initiate SGTS lation nich Radiation - b. Isolate reactor zone and Reactor Zone refuleing floor.

c. Close atmosphere control system.

1 Instrument Channel - < 100 nr/hr or downscale

~

F 1. 1 upscale or 2 dovnscale vill Rea: tor Building 'lenti- a. Initiate SGTC.

lation High Radiation b. Isolate refueling floor.

Refaleing Zone c. Close atnesphere control

, systen.

2 (7)(8) Instrument Channel Charcoal Heaters < 200C H and 1. Belov 2000 cfn, trip setting charcoal rT

, SGTS Flov - Train A cfm R. H. Heaters < 2000 ~

(A or F) heaters vill turn on.

~3 Heaters efn 2. Belov 2000 cfm, trip setting R. H.

' . heaters vill shut off.

~

2 (7)(8) Instrument Channel Charcoal Heaters < 2000 H and 1. Belov 2000 cfn, trip setting charcoal SGTS Flev - Train 3 can R.H. Heaters < 2000 -

(A or F) heaters vill turn on.

rsJ Heaters crm 2. Below 2000 cim, trip setting R.H.

< q heaters vill shut off, rs; 2 (7)(8) Instrument Channel Charcoal Heaters < 2000,cfm H and 1. Lelow 2000 cDr., trip setting charcoal SGT3 Flov - Train C R.H. Heaters < 2000 cfm

~

(A or F) heaters vill turn on.

Heaters 2. Belov 2000 cfn, trip setting R.H. '

heatern vill shut off.

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Minittum No.

Instrument Ciennels Operable per hip Sys(l) Function Trip Level Settice Action (1) Remarke 1 Resctor Building Irelation 0 1 t 1 2 secs. H or F 1. Below trip setting prevents Titer (refueling ficor) spurious trips and system pertur-bations from initiatice isolation 1 Instrueent Cluinnel - N/A H or F 1. 1.oc a t e d in unit 1 only Static Prescure Control 2. Permissive for static pressure Perm ssive (refueling control (SCIS A, B, or C on).

Clunnel shared by permissive en fluer) reactor zone static prezaure cont.

E or F 1. Leested in unit 1 only 1 Stet te Pressure Control 1 1/2" H 2O 2. Controle static pressure of Prcesure Regulator (P.e-refueling fine during reactor

$ fucitng Floor) ,

building taolation with SCTS running "I Reactor Building Isolation 0 i e 1 2 secs. C or A 1. Below trip setting prevents or H apurious trips and systen pertur-Timer (re2ctor zone) bations f ror initiating isola tion I n s t r'usen t Channel - N/A I 1. Perrissive for static prescare 1(9) c o n t r o .' (SOTS A, 3, or on).

Statte Prescure Control Channci shared by per-ie si'.c on Pe r- is s iv e (reseror ref ueling ficor static pr:= sure

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controi.

IJ 1. Controla static pressure of

( ,a 1(9) Ststic Pressure Control 1 1/2" H 2O I reactor zone during reactor PrNeure Regulator (reactor cg building isolation with SGTS

one) running.

2 Group 1 (Initiating) Logic N/A A 1. Refer to Table 3.7. A for liet of valves.

1 Croup 1 (Actuation) Logic N/A B 1. Re f er to Table 3.7. A f or lis t of valves.

TABLE 3.2.A (Coatinued)

Mini m m No.

Cham $fs" Operable Per Trip Syp(l) Function Trip tavel setting Action (1) Remarks 2 Croup 2 (Initiating) Iagic N/A A or 1. Refer to Table 3.7. A for list of

($ and E) valves.

1 Croup 2 (ILER teolation-Actuation) N/A D togic 1 Croup 2 (Tip-Actuation) tagic N/A J 1 Croup 2 (Drywell Samp Drains- N/A E Actuatioe) togic 1 Croup 2 (Reactor Building & N/A F and C 1. Part of Croup 6 logic Refueling Floor, and Drywell

$ Vant and Purge-Actusttoo) togic 2 Croup 3 (Initiating) Logic N/A C 1. Refer to Table 3.7.A for list of valves.

1 Croup 3 (Actuation) tegic E/A C 1 Croup 614gic N/A P and C 1. Refer to Tabla 3.7.A for list of valves.

1 Croup 8 (Initiattag) Logic N/A J 1. Refer to Table 3.7.A for list of valves.

FJ 2. Same as Group 2 initiattag logic i ,a

1. 3 1 Reactor Building Isolation N/A R or F 1. 14gic has permissive to refueling d (refueling floor) Logie floor static pressure regulator.

'd 1 Reactor Bu11 ding Isolation N/A H or C or A 1. Logic has peratesive to reactor

(-N (reactor rone) Logic zone static pressure regulator.

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TABLE 3.2.A (Continued)

Minimum No.

Instrument Channels Operable per Trip Sys(l) Function Trip Level Setting Action (1) Rema rk s 1(7)(y SCTs Train A Logic N/A L or (A and T) 1(.?'6, SCTS Train 5 Logic N/A L or (A and F)

I' - I t4/ a85 F 1

S StC'}a ticTratu C Logic Pressure Control N/A ( k or F) 1. Located in unic 1 only (ref ueling floor) Logic 1(9) Stacic Pressure Control N/A I (reac:or zone) Logic Refer to Table 3.2.8 tor RCIC and HPCI fucctions including Groups 4, 5, and 7 valves.

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NOTE 5 FOR TABLE 3.2.A

1. Whenever the respective functions are required to be operable. there shall be two operable or tripped trip systems for each function. /s if the first column cannot be met for one of the trip systems. that crip system or logic for that function shall be tripped (or the appropriate action listed below shall be taken). If the column cannot be met for all trip systems, the appropriate action listed below shall be taken.

A. Initiate an orderly shutdown and have the reactors in Cold Shutdown Cendition in 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

8. Initiate an orderly load reduction and have Main Steam Lines -

isolated within etaht hours.

C. Isolate Reactor Water Cleanup System.

D. Isolate Shutdown Cooling E. Initiate primary containment isolation within 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

F. The handling of spent fuel will be prohibited and all operations over spent fuels and open reactor wella shall be prohibited.

G. Isolate the reactor building and start the standby gas treatment system.

H. Immediately perform a logic system functional test on the logic in the other trip avstenaand daily thereafter not to exceed 7 days. A

1. No action required. Reactor zone walls and ceiling designed above suction pressure of the SGTS. v

.i. Withdraw TIP.

K. Manually isolate the affected lines. Refer to section 4.2.E for the L. ki e' t a actions H or action A and F. If two SGTS Nre&inoperable t ain" is"Nokera ta e actions A nd F

2. When trains it is $etermined that a channel is [ ailed in the unsafe condition.

the other channels that monitor the same variable shall be functionally tested immediately before the trip systes or logic for that function is tripped. The trip system or the logic for that function may remain uatripped for short periods of time to allow functional testing of the other trip system or logic for that function.

3. There are four sensors per steam line of which two must be operable.

4 Only required in Run Mode (interlocked with Mode Switch).

$. Not required in Run Mo'de (bypassed by mode switch).

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6. Ch.innel shared by RPS and Primnry Cont ainment 6 Reactor Vessel Inolation

(.ontrol System. A channel f ailure etay be a channel f ailure in cach systen.

7. A train is considered a trip system, *

,8 luo out of three SGTS trains required. A failure of more than one will require

• action A and F.

9. There is only one trip system with auto transfer to two power sources.

10. A channel contains four sensors, all of which must be operable for the channel to be operable.

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TA3LE 3.7.A FRIw.ARY CONTAINMENT ISOLATION VA1.VES Number of Power M.aximu:2 Action on Operated Valves Operating Normal Initiating Group Valve Ident1*ication Inbo rd Outboard Tine (sec.) Position Signal 1

Main steaaline isolation valves 4 4 3<T<5 0 CC (FCV-1-14,26,37,651 ;1-15, 27, 38, & 52) 1 Main steamline drain isolation 1 1 15 0 CC valves FCV-1-55 & 1-56 1 Reactor unter sample line isola- 1 1 5 C SC cion valves U

2 R!LES shutdown cooling supply isolation valves FCV-74-48 6 47 1 1 40 C SC 2 RJIRS - LPCI to reactor FCV-74-53, 67 2 30 C SC 2 Reactor vessel head spray isola-tion valves PC'v-74-77, 78 1 1 30 C SC 2 RRRS flush and drain vent to suppreacion charaber 4 20 C SC FCV-74-102, 103, 119, & 120 r

3 2 Suppression Chareber Drain 2 15 C sc

( y FCV-74-57, 58

. 3 2 Dr)vell equipaent drain discharge

_) twolstion valves FCV-77-15A, & 15B 2 15 0 E

^J 2 Dry.ic11 floor drain disch4rge J

isolation valves FCV-77-2A & 2B 2 15 0 CC

UNIT 3 PROPOSED CHANGES 9701

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Revised 1-10-78

3. Core Maximum Fraction of Limiting Power Density (CMFLPD) - The hir, hest ratio, for all fuel types in the core, of the maxinann fuel rod power density (kW/ft) for a given fuel type to the liniting fuel rod power-density (kW/ft) for that fuel type.

4 Average Planar Linea- Heat Generation Rate (ALPHGR)

- The Average Planar *.Jeat Generation Rate is applicable to a specitic planar height and is equal to the sum of the linear heat generation rates for all the fuel rods in the specified bundle at the specified height divided by the number of fuel rods in the fuel bundle.

v. Instrumentation

1. Instrument Calibration - An instrument calibration means the adjustment of an instrument signal output so that it corresponds, within acceptable range, and accuracy, to a known value(s) of the parameter which the instrument monitors.

2. Channel - A channel is an arrangement of sensor (s) and associated components used to evaluate plant variables and produce discrete outputs used in logic. A channel termitiates and loses its identity where individual channel outputs are combined in logic.

-g_, 3. Instrument Functional Test - An instrument s, functional test means the injection of a simulated signal into the instrument primary sensor to verify the proper instrument channel response, alarm and/or initiating action.

4 Instrument check - An instrument check is qualitative determination of acceptable operability by observation of instrument behavior during operation. This determination shall include, where possible, comparison of the instrument with other independent instruments measuring the same variable.

5. Logic System Punctional Test - A logic system functional test means a test of all relays and contacts of a logic circuit to insure all components are operable per design intent. Where practicable, action will go to completion; i.e.,

pumps will be started and valves operated.

6. Trip System - A trip system means an arrangement of instrument channel trip signals and auxiliary equipment required to initiate action to accomplish s=~

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Revised: 11-9-79 TABLE 3.2.A ins:s m TATI p PRl"N CTCAI'm m a v.ma t;IL:n IsouTION Minicum No.

g Instrument b Channels Operable actie, r1, r e-a r u

s . rip revel settim _

g per Trip Sys(l) ru.c.io, A cr 1. Eelow trip setting does the e

Instrument Channel - 2 5 38= atove vessel zero fc11oving:

% 2 (B ar.d E) Initiates scacter Building Peactor Lcu Water level (6) a.

Z Isolation C b. Initiates Pr imar y Cont a t r re.t Isolation

'4 c. Initiates SGTS D 1. Above trip settir.g isolates the 1 In st r ar.ent Channel - 1001 15 psig snutdown CN1ir.g surtio'. valves Feactor Hign Pressure of the EER system.

A 1. Below trip setting initiates Main 2 Instrument Channel - i 2 f@ above vessel zero steam Line Isolation Beactor icw Water Level (LIS- 3-56 A- D, SW # 1)

A or 1. Above t rip set tir.g does the 2 Inst rume nt Channel - 5 2.5 a s .3 (B and El following:

aign Drywell Pressure (6) a. Initrates Peacter Buildi ng (PS-64-56 A-D) Isolation

b. Init iates Fr.s. arf Containment 3 Isolation

c. Initiutes *ATS 8 1. Abr ee trip set ting initiates min In st rument Channel - s 3 times normal rated 5'.eam Line Isola tion 2

High Radiation Main Steam f ull power backgrourva Line Tunnel (6) Below trip set ting 2nitiat es Main D 1.

Instrument Channel - 2 850 psig (4) Steam Line Isolation 2

Low Prestur e Main Steam Line D 1 Arove trip settino irtitiates ein 2 (3) In s tr um ent ch an n e l - 5 140s of rated stearn ficw Stesm Line I so la t ion L'ig h Plow Matn Steam Line a 1. Above trip setting initiates Inatro ent channel - s 200*r Main Steam L nc Isolatien.

2 (10) Main Steam Line Tunnel p-J Eigh Temperature g

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TABLE 3.2.A PRIMARY CDNTAINMEffT AND REACTOR BUILDING ISOLATION INSTRUME?rrATION Instrument Channels Operable R ema r k s Action til Per Trip Sys(l) runct ion Trio Level settina C 1. Above trip setting initiates Instrument channel - 160 - 180*F 2 Isolation of Reactor Water Peactor Water Cleanup Cleanup Line f rom Reactor and System Floor Drain Reactor Water Return Line.

Bign Temperature 160 - 180*F C 1. Same as above 2 Instrument Channel -

Reactor Water Cleanup System Space High Temperature 5 100 mr/hr or downscale G 1. 1 upscale or 2 downscale will 1 Instrument Channel - a. Initiate SGTS Reactor Building Venti- b. Isolate reactor zone and 1ation High Radiation - refueling floor, Reactor Zone c. Close ateosphete control system.

E F 1. 1 upscale or 2 downscale will 1 Instrument Channel - 5 100 mr/hr or downscale a. Initiate SGTS Reactor Building Venti- b. Isolate refue.i.9 floor.

1ation High Radiation - c. Close atmospusce control system Refueling Zone

1. Below 2000 cfm, trip setting char-2 (7) (8) Instrument Channel Charcoal Heaters 5 2000 cf m H ard SGTS Flow - Train A R.H. Heaters 5 2000 cfm (A or F) coal heaters will turn on.

Below 2000 cfm, trip setting R.H.

2.

Beaters heaters will bhut off.

1. Below 2000 cfm, trip setting char-2 (7) (8) Instrument channel Charcoal Heaters 5 2000 cfm H and coal heaters will turn on.

SGTS Flow - Train B R.H. Heaters 5 2000 cf m (A or F) Below 2000 cfm, trip setting R.H.

2.

Featers heaters will shut of f.

H and 1. Below 2000 cfm, trip setting char-Instrument Channel Charcoal Heaters 52000 cfm 2 (7) (8) R.H. Heaters 5 2000 cfm (A or F) coal heaters will turn on.

pj SGTS Flow - Train C 2. Below 2000 cfe, trip setting R.H.

' 'I Beaters heaters will shut off.

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T AEL E 3.2.A A W AN R EAN BWNMW N INSTWMENMICS Minimum No.

' Instrument Channels Operable per Trip Sys(l) runct ion Trip Level setting Ac ti on til R ema r ks 1 Reactor Building Isolation 05t 5 2 s ecs. H or F 1. Selow trap setting prevents Timer (refueling floor) spurii us trips and system pertur-bations from initiating isolation N/A H or F 1. Located in unit 1 only 1 Instrument channel -

2. Permissive for static pressure Static Pressure Control Permissive (refue ling control ( SGTS A, B, or C on).

Channel shared by permissive on floor) reactor zone static pressure cont.

Static Pressure Control 5 1/2" H O H or F 1. Located in unit 1 only 1

Pressure Regulator (Re- 2. Controls static pressure of fueling Floor) refueling floor during reactor building isolation with SGTS r unning.

Reactor Building Isolation 0 5 t 5 2 secs. G or A 1. Below trip setting prevents I

or H spurious trips and system pertur-Timer (reactor zone) bations from initiating isolation Instrument Channel - N/A I 1. Permissive for st.* 'a pressure g 1 (9)

Static Pressure Control contro'. (SGTS A, T, or C on).

Channel shared by permissive on Permissive (reac tor refueling floor static pressure zone) c ontrol.

Static Pressure Control 5 1/2" B O I 1. Controls static pressure of 1(9) reactor zone during reactor Pressure Regulator (reactor building isolation with SCTS zone) running.

2 Group 1 (Initiating) Logic N/A A 1. Refer to Table 3.7. A f or list of valves.

1 Group 1 (Actuation) Logic N/A 3 1. Refer to Table 3.7.A for list of valves.

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TABLE 3.2.A PRIMARY CONTAINMEffr AND REACTOR BUILDING ISOLATION INSTRUMENTATION Minimum No.

Instrument Channels @erable per Trip hvs(1) Trip _ Level setting Action (1) R ema r ks Fu n ct ion 2 Groep 2 (Initiati ng) Logic N/A A or 1. Refer to Table 3.7.A for last oz (B and E) valves.

1 Group 2 (RRR Isolation- N/A D Actuation) Logic 1 Group 2 (Tip- Act uation) N/A J Logic Group 2 (Drywell Sump N/A K 1

Drains- Actuation) Logic 1 Group 2 (Reactor Building N/A F and G 1. Part of Group 6 Logic.

& Refueling Floor, and Dry-teell Vent and Purge-Actuation) Logic 2 Group 3 (Initiating) Logic R/A C 1. Refer to Table 3.7.A for list of valves.

1 Group 3 (Actuation) Logic N/A C 1 Group 6 Logic N/A F and G 1. Refer to Table 3.7.A for list of valves.

1 Group 8 (Initiating) Logic N/A J 1. Refer to Table 3.7.A for list of valves.

2. Same as Group 2 initiating logic.

1 Reactor Building Isolation N/A B or F 1. Logic has permissive tO ref ueling sg (refueling floor) Logic floor static pressure regulator.

'. 4 Reactor Buildiog Isolation N/A B or G 1. Logic has permissive to reactor

( ) 1 zone static pressure regulator.

(reactor zone) Logic or A

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TABLE 3.2.A g, , PRIMARY CDNTAINME!C AND EEACTOE BUILDING ISOLATICN INSTRUMENTATION Instrument Channels Operable per Trip Sys(l) Funct. ion Tr1D Level Setting Action (1) R e m.a r k s 1(7) (8) SGTS Train A logic WA L or (A and F) 1(7) ( 9) SGTS Trais. 8 Lo;ic WA L or (A and F1 1 (7) ( 0) SGTS Train C I4qic N/A L or (A and F) 1 Static Pressure control WA B or F 1. Located in unit 1 only.

(refueling floor) Logic 1(9) Static Pressure Control N/A I (reactor zone) Logic Refer to Table 3.2.B for PCIC and HPCI functions including Groups 4, 5, and 7 valves.

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3. There are four sensors per steam line of which two must be operable.

4 Only required in Run Mode (interlocked with Mode Switch) .

5 Not required in Run Mode (bypassed by mode switch) .

6 Channel shared by RPS and Primary Containment 6 Reactor Vessel Isolation Control System. A channel failure may be a channel failure in each system.

7., A train is considered a trip system.

8. Two out of three SGTS trains required. A failure of more than one will require action A and F.

9. There is only one trip system with auto transf er to two power sources.

10. A channel contains four sensors, all of which must be operable for the channel to be operable.

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TABLE 3.7.A PRIMARY CorrfAIrMENT I!OLATION VALVES Max. imam ActAon on Number of Powe r Initiat ing Operated Valves Operating Normal Position Signal Group valve Idastification Inboard Outboard Time (sec.)

3<T< 5 0 GC 4 4 1 Main steamline isolation valves

( PCV- t- 14, 26, 37, & 51; 1-15, 27, 38 6 52) 1 15 0 GC Main steamline drain isolation 1 1

valves (rCV-1-55 & 1-56) 5 C SC Reactor Water sample line isola- 1 1 1

tion valves 2 RHRS shutdown cooling supply C SC 1 1 40 isolation valves (FCV-74-48 & 47) 2 30 C SC 2 RIIRS - LPCI to reactor (FCV-74-53 & 67) 2 Reactor vessel head spray isola- C SC 1 1 30 tion valves (FCV-74-77 & 78) 2 RERS flush and drain vent to 4 20 C SC M suppression chamber

" (FCV-74-102, 103, 119, & 120) 15 C SC Suppression Chamber Drain 2 2

(FCV-75-57 6 58) 2 Drywell equipment drain discharge 2 15 0 GC isolation valves (FCV-77-15A & 158) 2 Drywell floor drain discharge 15 0 GC 2

isolation valves (FCV-77-2A & 28) t IJ

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9 ENCLOSURE 2 JUSTIFICATION UNITS 1 AND 2 - pages 6, 56, 60, and 61 UNIT 3 - pages 6, 57, and 63 These pages are being revised to clarify the technical specification requirements regarding isolation of main steam lines following main steam line high temp-erature logic actuation. The variation in interpretation led to a repertable occurrence on Browns Ferry. (See Reportable Occurrenct Report BFRO-50-259/7925 submitted by letter from J. R. Calhoun (TVA) to James P. O'Reilly (NRC/ Region II) dated October 9, 1979.) This technical specification revision is a corrective action committed to in that RO. These revision will climinate the variation in interpretation and help to decrease the number of reportable occurrence reports filed.

UNITS 1 AND 2 - page 250 UNIT 3 - Page 262 FCV 1-55 and 1-56 drain valves are required to be open for extended periods during power operation. Therefore, these valves will be considered as normally open and technical specification surveillance requirement 4.7.D.l.b will apply.

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