ML20046A449

BSEP SE Sys Instrumentation & Control Setpoint Review

ML20046A449
Person / Time
Site:	Brunswick
Issue date:	12/19/1989
From:	CAROLINA POWER & LIGHT CO.
To:
Shared Package
ML20046A307	List: BSEP-93-0112, Proposed Tech Specs Associated W/Sws ML20046A306 ML20046A320 ML20046A326 ML20046A329 ML20046A335 ML20046A340 ML20046A449
References
G0050A-18, G0050A-18-R00, G50A-18, G50A-18-R, NUDOCS 9307280106
Download: ML20046A449 (26)

Text

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.y-Calc. C0050A-la Rev. O Page-1 of 11 TABLE OF CONTENTS' Section -

Title Pace No.

Cover Page Table of Contents i

p List of Effective Pages I.

it Purpose II.

l' Introduction III.

1 Recommended Action Items 2

Table 1 - Satpoint Review SW Header Pressure Switches' Vital Header Pressure Lube Water Suetion Header Pressure Lube Water-System Pressure DG Jacket Water Cooler Pressures Design Verification Forms.

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cale. G0050A-10 Rev. O Page_11 of 11 List of Effective Pages Pace No.

Revisien No.

L 0

11 0

1 0

2 0

3 0

Att. 1 0

Att. 2 0

Att. 3 0

Att. 4 0

Att. 5 0

Att. 6 0

Att. 7 0

(4757WED.wP/che l

, cale. G005CA-la

' Rov. O Page 1 of 3 I.

Purpose The purpose of this review is to determine the acceptability of the BSEP service water Systems instrumentation and control setpoints.

Setpoints requiring revision will be identified and new setpoints recommended.

addition, SW system operability with the current In assessed.

setpoints will be II.

Introduction P

During the DET review of the service Water system, one of the issues.

raised concerned accuracy of instrument and control setpoints.

In response, a review was initiated to determine acceptability of all' Service Water system setpoints.

The results of the review are provided in Table 1, and include the following items for each setpoint identified:

Instrument Title and Designation Current Setpoint e

Function i

e Acceptability of Current Setpoint or Recommended e

Setpoint/ System Modification Bases for Determination (reference document / source) e The instrument setpoints listed were obtained from system descriptions in the Plant Operating Manual. The system description.for the SW system and otner systems that are supported by the SW system were reviewed.

The " current setpoint" is the setpoint as listed in the system description.

The " function" is as listed in the system description unless noted otherwise.

The acceptability of the setpoints was determined by review of the following types of documents:

e P& ids Specificacions e

Instrument Schedules e

Vendor Manuals and Drawings e

FSAR Plant Procedures e

Instrument Drawings Calculations e

e Test Data Plant Documentation & Correspondence e

Equipment Data Base e

If the current setpoint was found to 's acceptable, the word "acceptacle" will appear.

If a new tsepoint is justified, the new recommended.setpoint is listed or a Jiscussion is provided to determine

~

acceptability.

The source used.as'.he basis for. acceptability,-or a discussion that includes references, is provided in the ' basis" column.

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cale. G0050A-18 Rev. O Page 2 of 3 Although some setpoints are listed as " acceptable," they may not be the optimum setpoints.

An " acceptable" setpoint provides necessary protection for a component including some conservatism.and reasonable operational flexibility while An optimum setpoint provides necessary protection for a component and maximum operational flexibility.

Although several setpoint revisions are recommended, no operability concerns were identified.

Most changes are the result of using mora conservative instrument accuracies.

An increase in the Vital Service Header low pressure alarm setpoint is recommended, but hydraulic modeling has demonstrated that the existing setpoint will not compromise i

the safety-related function of the Vital Service Header.

An increase is also recommended for the service water lubricating water pump low discharge pressure alarm setpoint, and for the standby pump auto start I

setpoint, but the existing switch setpoints ensure adequate flow to maintain the SW pumps operable.

A significant change to the RSCCW Heat Exchanger disenarge temperature is recommended, but a high temperature allowed in this line by the setpoint would not prevent the SW system from performing its safety function.

During the review, several concerns or discrepancies were identified.

A list of recommended action items is provided below.

III.

Recommended Action Items

)

1.

Setpoints specified for lubricating water flow to the circulating water pumps bearings were not consistent in plant drawings and procedures.

The valuee ranged from 5 to 8 gallons per minute for trip of circulating water pump and/or low flow alarm.

A review should be conducted to identify these inconsistences and correct documents as required.

Both pump trip and alarm should be at the same setpoint since both functions utilize the same instrument.

lube water flow is nonsafety-related.

CW 2.

The function of SW-PS-136 should be reviewed and possibly deleted.

See Attachment 4.

3.

Delete instruments for SW flow from CW Pump Motor Thrust Bearing Cooler from SD-43.

4 SW system no longer supplies this flow.

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4.

Lower setpoint for RSCCW Heat Exchanger discharge temperature l

(SW-TSH-837) as recommended in Table 1 to be cocpatible with discharge piping design temperature.

5.

Review Diesel Generator Jacket Water Cooler SW pressure requirements specified in OP-39 and revise the procedure as j

i s

necessary.

See Attachment 6.

(4757kt0.W/cne )

s Calc. C0050A-18 R v. O-Page 3 of'3.

6.

Research of'recent flow testing indicated flow to.RRR pump seal coolers:may be below instrument setpoint.

Instruments are energized to.alcem most of the time or are inoperable.

Operability of instruments should be investigated.

Recent evaluation also indicates that SW may~not be required to RHR pump seal coolers because seals can withstand higher temperatures than expected.

This should be. confirmed and instrument setpoint revised accordingly.

7.

Increase the setpoints for service water lubricating: pump low discharge pressure alarm and standby lubricating water pump autostart SW-PS-1315 and -1316.

See Attachment.5.

8.

Increase the setpoints for vital service header pressure SW-PSL-1174 and -1178.

See Attachment 3.

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J_nstrumentet son and Control Setooint Review Bretrument Title & Desimation Current Setooint f WiClim Acceptability /

Recommended Setcoint.

gg Conwontional Needer Pressure SWP5-129 39-41 peig

.--Automatic Start Signet to 37-43 psis Catc. G00504 13' Decreesig

' Sten 6y Conv. SW Pg in Auto Decreasing See At tachment. 2 Position.

SW PSL 130 43'pnie

- Cony. udr. Serv. Water Press -

42-48'psig~

Decrossing Lou Aleam on Am Penet U4 01.

Decreasirig see Attachment 2

'SS PS-3213 37-43 pois

-- Automatic stort signet to Acceptable

- Decreasingt Ston e y Cany. $W Psay in Auto Cate. G00504 'Positlen.'

-leuclear Needer Prer.sure

$W-PS-3214

-3T-43 peig

- Automatic start for MUC. Su Psap Acceptable Catc. G00504 13 so rs 2T1 Decreesleg in AUTO Position; and 3

- Automatic Start for Corw. SW 4

Puup in AUTO Position.1f.atigned to the seut. tidr. See mete 4.

$& PSL-142 41-43 psig-

- Isue. sedr.Fserv. unter Press. -

'42-48 pais-see' Attachment 2 Decreasing low store en Ann. Penet u4-01.

Decreasing tivision'I RIIR $W steeder Pressure ~

5W-PS-11T5 A & C

.18-22 pelg

- ama SW Ptsp I -- suct. see.

13.T 1T.3 psis Catc.89-050 01'.

- Decreasing Pressure - 1.ow Alera en Ann.

. Decreasirq (Pfl 99 050)

Penet A-02.

Trips test su Pumps A and C ef ter-

.5 second time deley (Su-304 62AT).

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ai Cetc. G00104-18 Att. 1; aev. O I ASL E 1 Page 2 of 8 Instrumentation and Controt Setooint Revieu jnstrument fitte' 5 Desienstien Current setooint Fmctiert Acceptability /

Recommended setnoint gesis Division it age SW meeder Pressure SW P5 ille a & a 18-22 psig

- ana SW Ptmes II - Suct. Noa 13.T-1T.3 psis Calc. 89 050 01 Decreasing Pressure - Lou Alarm on Am.

Decreasing (PN 89 050)

Penal A-02.

- Trips SMR SW Ptaps 3 and D ef ter

' $ second time deley (SW IDA-6201).

Ace SW Ptap A Suction Needer Pressure Switch

.5W-PS-llT5A 18-22 pois.

- Trips ama SW Ptap A after 13.T-17.3 psig Calc.89-050 Decreasing

~ 5 second time deley (SW-tot-62A)

Decreasing (PM 89-050)

- ema SW Ptap Ell-COGIA trip Atore en Ann. Penel A 01.

AME SW Ptap C Section Needer Pressure Switch 5W-PS-11T5C 18 22 pois:

- Trips ama SW Pump C after -

13.T-1T.3 puis Cate. 89-050-01 Decreasing

$ second glas deley (SW-TOR-62C).

Decreasing (PM 89-050)

- RNR SW Ptap 'E11-C001C Irlp Atara en Ann. Penel A-01.

RNE SW Pump B Suction lleeder 1

-Pressure switch 15W-P5-19T68' 18-22 peig-

,- Irips RNA SW Ptap S after 13.T-17.3 psis Calc. 89-050-01 Decreesing 5 second time deley (SW-10s-62s).

Decreasing (Pn 89-050).

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- RNR SW Ptap Ell-CO0le Trip Atera on Am. Penet A 03.'

e s. Mus n un-o. s... s '

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Cetc. (.00$0A 1S Att. 1. Rev. O I A8tt 1 Page 3 of e jnstrtamentation ard Ccntrot Setroint Review instrument title & Desienation Current Setpoint f W tion Acceptability /

Recomumended Setoolnt posts -

Sue SW Pump D Suct son Needer 18-22 pste

- trips 8tet SW Ptap D af ter

- 13. T-17.3 ps i g Calc. 89-050-01 Pressure Switch Decreasing-5 second time deley (SW-IDR 620).

Decreasing (PM 89 0503

- Amt SW Pump E11-C0010 Trip Alarm on Am. Panel A-03.

Vital Service Needer Pressure Devisim I (f an ctg tktit C5 Pop te A Intet Pressure)

SW P$t 1174 29 31 pois ten Cts unit C5 Pep Re A Inlet 34.5-40.5 psig See Attachment 3 Decreasing Pressure - Low Alarm on Am.

Decreasing

-Penet 12-05.

Witet Service Needer Pressure Division it (fen ctg tatit C5 Pup to S Intet Pressure)

SW-75L-11TS 29 31 pais

- fan ctg unit C5 Pup to S Intet 34.5 40.5 psig see Attachment 3 Decreasine

' Pressure - Low Alers on Am.

Decreasing Penet 82 05.~

Conventionel SW Puup Strainer -

Differential Pressure SW-PotC-116 3.5-4.5 paid

- opens steiner bioinkwt volve.

Acceptable Consistent with SW-Pelt-118 Increasine

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essgtims of sw SW-POIC-120

- Starts strainer backwesh motor.

system calculations.

SW-PosN-117 9-11 paid

- Conv. SW Ptap Strainer elff. -

Acceptable PM F5-651

'SW-POSN-119 Increasing Nigh Alere on Ann. Penel 04-01.

$W-P05N-121 4

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Calc 000$04-18 :

Att. 1. Rev. 0-J ASt f 1 Page 4 of 8 Instr e tation and Control Setooint Review Instrument litte & Des 6anation Current setooint-functigr)

. Acceptabitity /

pecosamended setooint nuclear' $W Pump stratner 9 asis Ditforential Pressure

-.5W P01C-138 3.5-4.5 paid

- Opens strainer bloudows valve.

$W P0lC-140 Increasing Acceptable Consistent with.

- Starts strainer backmash motor.

• ss g tions of su systee calculations.

5W-70se 139 9-11 peld SW P05N-341

- muc. SW Pump Streiner Dif f. -

Acceptable PM F5 651 locreasirg Nigh Alarm on Am. Panel U4-01.

Circ. Water intake Pumps Seering Water $wly strainer Dif ferential Pressure SW-Posu-2TO 14-16 psid

' erg. Liee Water strainer Dif f. -

Acceptable Operating increasing Megh Alarm en Am. Panet 04-01.

emperience.

Strainers cleaned approa. 1/ year.

FIou to CW Pumps ensured by flow switches.

t Lihe Weter flow to Circuteting Water Pumps SW f5 112 6.5-T.5 Spa

. CW Pump Lthe Water flow - Low 5-6 ppa

- PDC-84 0008. Must sW 55-113 Decreaming Alarm en Am. Panet UA-01.

Decreasing be same as 09 Pump SW fs-114 trip setpoint

- SW-f5 115 since these are.

the same instruments.

SW-f5-112 5-6 gpm

- Trip CW Inteke Pump on tow flow -

Acceptable PDC 84-0008

$W-ft-113 Decreasing.

to bearings.

su f5-114'

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CatcJ G0050A 18 Att. 1. Rev. O Insty 1 Page 6 of 8-ins t rument a t ion and Control Setooint Review Instrtsment Title & Des 6enetion Current Setpoint fisic t igrt Acceptabitity /

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Recomumended $etuoint

Best, agCCW meet Eschenger Nttot needer temperature SW-154 837.

118* 142*f

- SgCCW ME Outlet NDR leep. Regh 103*-10T*f increesing Atere en Ann. Penet tJ4-25.

Discherge header Increasing men. discherpe

-temp. 105*f per specs. 258-3 &

248 117

- Riet $W P g Discharge temperature sW-Isu Il09 19T*-203*r

- ama su Pump sootor/ Pump migh Acceptabte nea. su leap is 5W-Ism-1111 Increasing leap. Alarm on Ann. Penel'A 01.

90*f.

f unc t ion was t o

- Irips SWE SW Pg eAen risning in the IEST mode only.

protect gasp esring test that is ne longer rewired.

5W I54-1110 19T*-203*f

- aus su Pimp notor/ Pump nigh acceptable nes. su Temp. is -

$W-15st-1912 Increasing leap. Alere on Ann. Penel A 03.

90*f.

fisiction was to

- Tripe RIIR SW Ptap edien ruming protect gump -

in the IESI mode only.

during test tn'at is rio longer 4-rewired.

4 Diesel Speed-n DG SCS 656T-1 495-505 rpm open service water vetve to Accept able DG 5CS-6567-2

- Increasing diesel generator.

- spec. 203-1 and 50 39 Woodeerd DG SCS-654T-3 toad sensing DG SC5 6567-4~

sovernor maintains

($ witch 3)-

-dieset speed at 514 rpm from idle to full toed.

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IAstE 1 Page 1 of 8 Instrimentation and Control Setpoint Review Instrument 16tle & Destenation Current Setooint f W tion Acceptability /

Pecommended Setooint tes DG 5C$-6564-1 495 505 rpm D5 $CS-6568 2 Closes Service unter volve to Acceptable Decreasing diesel generator.

spec. 20l*l and DS $CS 6564 DS 5Cs 6564 4 50-19. Wooseerd (Switch 3) toed sensing governor maintaine diesel speed et.

$14 rpo from idle to futt load.

Diesel Jocket Water Cooter $W Intet Pressure 2 SW-PS-1999 9-11 paig 2-5W PS-1998

- Closes normal SW st4 ply valve to Acceptable See Attachment 6 Decreasing jacket aseter cooler.

.2-5W-PS-1996 2 sW-PS-1995

- opens alternate sw sigply vetve to Jacket nester cooler.

Dieset Evgines 1-4 Jacket Water Cooler SW Pressure 2-5W'PSL 13PS-1 22 28 peig

. Lone Aterm on Lacet Control 12-18 psis see Attachment 6 -

2-5W-PSL-13PS Decreasirg Penet.

i 2-SW PSL 13PS 3

. Secreasing 2 $W-PSL-13Ps-4 (Some as SW-PS-6570-1 through SW PS 6570-4 tisted in 50-39.)

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. Page 8 of 8 -

Instrumentation and Control Setpoint Review Ins trsament Iitie & Desienetten Current setocint iunction Acceptability /

Recommended Setnoint sesis.

SW Intake' Structure Pump Level 2-SW-t$le-1555 37-39 ins.

- starts intake structure sump 3T-39 ins.

Increasirg pump.

IP F5tT (from top flenge Decreasing face)

(from top flenge face) 4 b 47. ins.

- Stops Intate structw e simp 45-4F ins.

IP 7517 Decreasing

pump, (from top flenge increasing fece).

(f rom lap Flange face) 2 $W tsmes-1554' 3135 trw.

- su intake structure samp Levet

~31 33 ins, fP-T514 Increesing Ni-Ni store en Ann. Penet UA-01.

Decreasing (from top flenge-(from top flenge facel face)

II0lES:

1.

Pressure setpoints ore the pressure et time instrument 'if elevation is dif ferent from process heeder.

2.

SW tsufletion Monitors setpoint not evolueted since. it is not based en a need to ensure SW system function.

3.

Strainer sectueen tieers not 'evolueted since they are not rewired to ensure SW system furwalon.

4.

Description of function clarified from meet. is specified in system description (50).

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Calc. G0050A-18 Att. 2, R0v.

O' Page 1 of 1-SW Header Pressure Switches The Technical Manual for Barksdale Pressure Switches (FP-9302 p. 10-12) sets the acceptable repeatability during testing at the minimum adjustable set at 12 1/2%.

Applying this worst case percent repeatability to the nominal point instrument wider range is recommended for the SW-PS-129 setpoint.setpoint value an The calculated acceptable setpoint range has been doubled to 13 psig to provide increased flexibility during instrument calibration and to achieve consistency with the other SW pump auto start instrument setpoint ranges. The resulting minimum pressure switch actuation point is conrervative compared to the minimum required SW header pressure determined by Calculation No. C0050A-13.

An increase in alarm setpoints SW-PSL-130 and SW-PSL-142 is recommended to ensure alarm actuation before pump autostart.

is also recommended for these instruments.The 23 psig range established above have been replaced with ASCO instruments.

Some Barksdale instruments 11.0% (Ref. ASCO Catalog).

Accuracies of ASCO instruments are I

5 (675 M D.WP/cne)

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Calc. G0050A-18.

Att. 3, Rev. O Page 1 of 1 Vital Header Pressure The minimum required vital service header pressure is the pressure nec during the " greater than 10-minute phase" of the design basis Loss of Cessary Accident (LOCA) to ensure required flow to the following:

oolant Two RHR Pump Room Coolers (174 gpm each):

348 gpm (reference calculation GOO 50A-1)

Two CS Pump Room Coolers (47 gpm each):

94 gpm (reference Calculation G0050A-2)

Per Calculation GOO 50A-10, the minimum required Unit 1 vital service header pressure at the tap to SW-PSL-1174 or -1178 to establish the above flow rates (accounting for the G0050A-10 specified flow rate accuracy of 5%)

approximately 32 psig.

is Per Calculation GOO 50A-12, the minimum required Unit 2 vital service header pressure at the tap to SW-PSL-1174 or -1178 to establish the above flow rates (accounting for the G0050A-12 specified flow rat accuracy of 10%)

is approximately 28 psig.

For an instrument tap elevation of e

(-)

7'-6", instrument elevation of (-)

of 1.03, and service water temperature of 90*F, the minimum required pre service water specific gravity at the pressure switch, rounded up to the nearest'O.5 psig, is as follows Unit 1:

34.5 psig Unit 2:

30.5 peig It is desirable to maintain consistency between the Unit 1 and Unit 2 instrument setpoints.

Since the Unit i setpoint is the more conservative, it will be applied to both units.

Applying the method used in Attachment determine the setpoint tolerance, results in a tolerance of 13 peig 2 to recommended minimum setpoint is therefore equal to 37.5 2 The 3 psig.

The existing setpoint for SW-P3L-1174 and -1178 is 29-31 peig.

allowable actuation value of 29 psig is less than the required pressure at the The minimum pressure switch for either Unit 1 or Unit 2.

However, Calculations C0050A-10 and -12 have demonstrated that the minimum required flow rates for the RER and CS pump room coolers specified above will be satisfied under normal and postulated accident (greater than 10-minute phase) conditions.

In other words, the minimum pressure in the vital service header under these conditions will be greater than the minimum pressure required to establish the' design flow rates.

Based on the results of these calculations, the current setpoint for SW-PSL-1174/1178 does not present an immediate operability concern..

However, in order to ensure that the pressure switches are capable of performing their design function (that is. to provide annunciation when vital service header pressure decreases to.the point where minimum required flow rates cannot be assured),

increased as recoausended 'above.

the setpoints must be n 7 W o. wore m

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Csic. GOO 50A-18 Att. 4, Rev. O Page 1 of 1 i

Lube Water Suetion Header Pressure The Service Water system hydraulic model results and calculations indicate th minimum pressure in the Lubricating Water Pumps suction header is e

approximately 27 psig.

Shutting the supply header from the Nuclear and Conventional SW Headers to the Lubricating Water Pumps and switching over to suction from the intake structure bay will reduce demand on the SW pumps.

However, due to pressure drops between the Lubricating Water Pumps and the SW pump bearings, the Lubricating. Water Pumps may not be able to supply design pressure and/or water quality to the SW pump bearings while taking suction from the intake structure bay.

Recommend that the SW-PS-136 isolation function be reviewed as part of the current SW Lube Water System modifications.

deleting the isolation function for the following reasonsConsideration should be given to better lubricating and cooling water pressure and quality can be obtained when taking suction from the SW headers at any pressure rather than from the intake structure bay.

reduced demand on SW system by isolating lubricating water supply from the SW headers is negligible.

4 e

Calc. GOO 50A-18 Att.

5, Rev. O Page 1 of 2 Lube Water System Pressure The design function of SW-PS-1316 is to auto start the standby Service Water Lube Water (SWLW) pump in the event design function of SW-PS-1315 is to alertthat the operating SWLW pump fails. The operators of an SWLW pump failure.

Tne setpoints for the two switches should therefore be the same.

The SWLW pumps take suction from the nuclear or conventional SW headers,.

depending on which is operating at the greater pressure.

The normal SW header pressure, specified in the SW system operating procedure, is 48-78 peig, sensed by pressure transmitters located at approximately 23'-5" elevation.

as The elevation of Pressure Switches SW-PS-1315/1316 is approximately 8'-O".

The maximum " normal" pressure sensed by Pressure Switches SW-PS-1315/1316 (neglecting losses between the SW header and pressure switches and assuming neither SWLW pump is operating) is therefore equal to (23*-5" - 9'-0")

2.24*

+ 78 = 84.9 poig

• 2.24 feet of sea water at a nominal temperature of 70'r equals 1 psig.

This pressure is 5 psig greater than the SW-PS-1316 nominal setpoint for SWLW pump auto start and is approximately equal to the SW-PS-1315 nominal alarm setpoint.

The allowable range for the SW-PS-1315 alarm setpoint is 84-86 poig.

The minimum actuation value is less than the maximum " normal" pressure sensed by the switch when losses between the SW header and the switch are neglected.

Analysis ID 82-220L-49 has calculated these losses to be approximately 3 peig the rated SWLW system flow rate of 150 gym.

At one third the rated flow at losses are approximately 0.8 psig.

These lossee do not include those

rate, that would occur due to flow through the nonoperating SWLW pumps (assuming SWLW pump failure).

Based on the preceding, it can be reasonably concluded that the pressure sensed by SW-PS-1315 will, in fact, be less than its maximum 411owable alarm setpoint.

SW-PS-1315 is therefore capable of performing its design function during normal operation based on the existing setpoint ranger-If the operating SWLW pump fail while the SW header is operating at its maximun "nora%1" pressure, the pressure sensed by sW-PS-1316 could be greater than its mi" ium actuation value and therefore the standby SWLW pump would not receive an to start signal.

In this case, operator action will be required to manually start the standby SNLW pump.

This can be accomplished by placing the SWLW pump control switch, located on the RTGB, to the ON position.

Although the standby SNLW pump may not have started, adequate flow would still be provided to ensure sw pump operability.

With pressure at 80 poig or higher at the discharge of the SWLW pump, there would still be enough flow to provide cooling to the SW pump motor.

The pressure drop from the SWLW pump discharge to the SW pump is approximately 47 psi (40 psi through the cyclone separator (Ref. FP-82596), and 7 psi due to an increase in elevation between the pumps, em7wn.ve rew

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,. =.

i Colc. GOO 50A-88 4

Att. 5, Rev. 0 --

I Page 2 of 2, Other pressure drops.are considered negligible).

Therefore,.there would still.

be approximately.33 psi available at the SW pump motor, which ensures' adequate 3

flow-(Ref. 01-03.4).

This also ensures some lubricating water flow to the i

pump bearings.

The pump vendor indicates a SW pump will remain operable under these conditions letter from Johnson Pump / General Valve Inc.,. dated-(Ref.

November 30,1989).

In order to ensure that SW-Ps-1316 is capable of performing its design function over the expected normal operating range of SW header pressvres, setpoint should be increased.

it s -'

.i The recossmonded minimum actuation value for the subject pressure switches is 87 psig.

This minismum recosumended value is approximately 2 psig greater than the pressure sensed ~by the switches when the SW header pressure is equal to

-i the normal range maximum and-is therefore conservative.

Applying a conservative instrument repeatability of'2.5% and allowing 0.5 psig for calibration accuracy, the resulting setpoint value is 90 a 3 peig..

i This.setpoint value is recommended for both SW-PS-1315 and SW-PS-1316.

?

i a

This setpoint is well below the minimum expected pressure at Pressure i

switches sW-PS-1315/1316, which is determined as follows.

Minimum " normal" sw header pressure equals 44 psig. Developed SWLW pump head at rated. flow of 150 gym equals 180 feet.

Resulting pressure sensed by.

sW-PS-1315/1316 equals:

L 23'-5= - 8*-o= + 1a0'-

,t 2.24_

+ 48 = 135 peig-spurious alarms / auto pump starts will therefore not occur as a result of the recommended increase in the setpoint values..

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-a csic. G0050A-18 Att. 6, Rev. O Page 1 of 1 Dianal Canarator Jacket Water Cooler Preneurag Calc. M-89-0008 Rev. 0 (EER 89-135 Rev. 1, Attachment 6) provides justification for SW flow as low as 350 gym to provide adequate cooling for a Diesel Generator.

Data obtained during flow testing and from cale. G0050A-10 demonstrate this flow rate can easily be met with inlet pressures lower than 4 peig and DP lower than 2 paid across the jacket water cooler.

The 10 psig setpoint for switchover from supplying unit header to the other unit header is a prudent setting since inlet pressures this low indicate high demand on SW in the supplying unit.

The 25 peig setpoint for low pressure alarm is high since adequate flow will be provided at pressures much lower.

A reduction of this setpoint to 15 psig will ensure a low pressure alarm is provided before the supply header switchover function at 10 peig.

OP-39 for the Diesel Generator indicates that service water DP of approximately 10 paid across the jacket water cooler and a service water outlet pressure of 30 poig be established by throttling heat exchanger outlet valve.

OP-39 should be revised to reflect the above setpoints.

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Page 1,of 5 7

Desien Documents A' list of EERs., plant modifications, and calculations planned or issued 'to date in support-of the Service Water System project'(PCN C0050A) is given.

below:

A.

Eneineerine Evaluation Reoorts (EERs)

Date Completed EER Number Descrintion 6/12/89 89-0135 JC0 for adequacy of SW system to neet R.1 design basis flow requirements 5/2/89 89 0147 Determination of correct setpoints.for SW-PS-129/271/3213/3214, SW PUMP AUTO START Pressure Switches 5/5/89

'89-0153 Evaluation of-Unit 1 Cross-tie valve leakage 6/13/89 89-0163 Revised operating line-up for SW R.1 system - Assessment of alternate line-up for extended operation 5/17/89 89-0164 Ventilation enhancement of a SW pump motor 12/15/89 89-0166 Verification of acceptable SW flow to.

R.1 RHR for worst-case expected LOCA containment cooling 5/31/89 89-0169 Evaluation of reliability of SW system

~

pump motors 6/22/69 89-0204 2A and 2B Nuclear,SW pump low flow operation evaluation 8/3/90 89-0213 Electrical evaluation of modification R.1 of SW pump motors 6/30/89 89-0212 Structural evaluation of modifications to SW pump motors 7/11/89 89-0220 Follow-up to EER 89 0315, revising hydraulic analysis for SW system nuclear header following completion of' PMs 89 048 and 89-049 9/8/89 89 0253 Providing design basis and evaluation i

of SW system requirements in Modes 4 1

and 5, Unit 2 9/26/89 89-0263 Evaluation of Outage operation of' Unit 2 nuclear.SW header with SW vital header unavailable 11/10/89 89-0297 Service Water Pump Motor S/N BHJ202018 Monitoring Program l

(4611NED.WP/che) l

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-; r.

Encineerine' Evaluation Reoorts'(EERs) (Continued)

Date Comnleted EER Number Descriotion 12/4/89 89-0333 Vital header operation ~from the Conventional Service Water supply' header 12/21/89 89 0334

' Evaluate effect of SW LU pump discharge check valve failure 12/29/89.

89 0363 Conventional SW Header Operability' t

R.1 Restrictions i

4/19/90 90 0094 Static Head Compensation For Service Water Header Pressure Instrumentation 7/25/90 90-0153 Establish An ISI Service Water Pump Performance Lower Limit t

A/5/91 90-0293 IB Conventional Service Water Pump -

R,1 Establish New Differential Pressure

. Reference Value 12/3/91 91-0450 Unit 2 Service Wate'r Operability F

B.

Plant Modifications Plant Modifications Completed to Date Unit Number Descriotion 1

89 048 SW-V103/106 Actuator and Logic Changes -

2 89-049 SW-V103/106 Actuator and Logic Changes 2

89-050 RHR SW pump supply header pressure nwitch setpoint changes

~1'89-051 REP SW pump supply header' pressure ~

I switch setpoint changes ~-

1 --

89-074 Replacement of SWaF0-1186 flow' orifice-J to restore.designLilow rate 2

89-075 Replacement:of SW F0-1187 flow orifice to restore design flow rate 1.89-088 LOOP' closure logic-for Valves SW V103--

and SW V106-

'2 89-089

-Lo0P closure-logic'for Valves SW'V103 and SW-V106 L

1 89-100 RHR SW pump suction pressure: alarms 2:

89-101 RHR SW' pump suction pressure alarms 1-82 219R Replace CSW pump dischargejisolation tvalves and-flanges 1

82 219S Replace CSW' pump _ discharge isolation

' valves.and flanges t

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Page-3 of 5

, Plant Modifications Comnleted to Date (Continued)

Unit Number Descrintion 1

82-219T Replace CSW pump discharge isolation valves and flanges 2

82-218R Replace CSW pump discharge isolation valves and flanges 2

82 218S Replace CSW pump discharge isolation valves and flanges.

2 82-218T Replace CSW pump discharge isolation valves and flanges 1

90-008 Service Water Valve V3 & V4 Valve-Close' Logic Change 2

90-009 Service Water Valve V3 & V4 Valve Close Logic Change C.

Current and Future Plant Modifications Unit Number Des c rintion 1

89-098 Canceled.

Scope included in PM.

82 221L.

2 89-099 Canceled. Scope included in PM 82-220L.

1 221L Service Water Lube Water (includes-SW pump motor. thrust bearing upgrades) 2 82-220L Service Water Lube Water (includes SW pump motor thrust bearing upgrades) 1 91-070 Unit 1 DG SW Supply Piping. Replacement 2

91-071 Unit 2 DG SW Supply Piping Replacement 2

91-072 Common DG SW Return Piping Replacement 2

92-047 Unit 2 DG SW Supply Piping Replacement Tie-in D,

Calculations l

Calculation No.

Date Descrintion PCN-C0050A-M-100.

5/24/89 SW System Flows at Maximum RBCCW HX Rev. 0-Flow P. ate PCN-C0050A M-101, 7/10/89 Minimum NSW Pump Flow Rates Rev. 2 PCN C0050A-01, 7/25/89

.RHR Room Cooler Allowable SW Inlet Rev - 2 Temperature PCN-G0050A-02, 7/18/89 SW Flow Rate Reduction Effect on SW Rev. 2 Inlet Temperature for Core Spray Room Air Coolers (4611NED.WP/che) j I'

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Page 4'of.5 Calculations (Continued)

CaIcularion No.

L Ilan Descrintion PCN G0050A-03, 6/30/89 Seismic Evaluation of Modification to

'Rev. F0 CE SW Motors C0050A-04, 7/10/89-Establish Target Flows for PMs 89 048 Rev. O and 89-049 Acceptance Testing C0050A-05, 7/10/89 Establish Required Throttle'"K"-Factor-

-Rev. O for Valves V103 and V106 C0050A-06, 9/7/89 Verification o'f'U2 SW System KYPIPE Rev. 1 Model Accuracy Using Revised "M" Values G0050A-07 7/6/89 SW System Temperature Limitations Rev. 0 C0050A-08, 8/9/89

. Resizing of Flow Orifices 2-SW F0-1187 Rev. I and 1-SW-F0-1188 C0050A-09, 8/1/89 Unit 1 SW Temperature Limit.

Rev. O G0050A-10,-

5/7/91 BSEP Unit 1 SW System Operating Limits.

I Rev. 4 During Normal and Outage Operations G0050A-11, 8/28/89 RHR SW Flow During' Cold Shutdown Rev. O G0050A-12, 2/26/92 BSEP Unit 2 SW System Operating Limits ~

Rev. 4 During Normal and Outage Operations PCN C0050A 13, 9/15/89 NSW and CSW Pressure Switch Setpoints

-Rev. O For Pump Auto Start C0050A-14, 4/12/90 BSEP Unit 1 and Unit 2 SW Systems Rev. 1 Cross Leakage Evaluations

C0050A-15, 2/12/90 Orifice Plate. Thickness For I

Rev. 0 2-SW-FO 1192, -1193, 1150, -1191 G0050A-16, 12/22/89 BSEP Unit I and Unit 2 SW Single Rev. O Failure Analysis C0050A-17,-

12/6/89 Loss of SW Lube Water Header Pressure Rev. O C0050A-18, 12/19/89 ESEP-SW Systems Instrumentation and Rev. 0 Control Setpoint Review C0050A 19, 12/15/89 Calculation of the Approximate.

1

-Rev. 1 Temperature Increase of the RBCCW System Following a LOCA'Without the Loss of Offsite Power-C0050A-20.

10/19/89 Hydraulic Anal'ysis of. Cooling. Water Rev. 0 Intake Canal and Pump Intake Structure C0050A 22, 2/12/90 RHR Pump Seal Cooler Orifice Sizing -

-l Rev._0 Unit 2 i

(4611NED.WP/Che)'

a

Page 5'of_5 Calculations (Continued)

Calculation No.

Date Descrintion C0050A 24, 4/27/90 Evaluation of Channel Assemblies for Rev. F0 Diesel Generator Jacket Water Coolers

'G0050A-25, 4/27/90 Evaluation for HFA Relay Seismic Rev. F0 Mounting G0050A-26, 9/30/91 Evaluation for Replacement Relays Rev. A 2-VA-TY-1606, 1607, 1608, and 1609 on Panel 2-VA-MI-DG 89-050-01, 12/15/89 Minimum Setpoint for RHR SW Pump Rev. 1 Suction Pressure Switches-

.M-89-0008, 5/3/89 Heat-Balance on DG 2 Jacket Water Rev. O Service Water lleat Exchanger M-89-0011, 12/7/89 RHR SW Heat Exchanger Heat Transfer-Rev. 3 Calculation M-89 0014, 6/6/89 RHR SW Heat Exchanger Heat Transfer.

Rev. 1 Calculation M-89-0015, 6/6/89 RHR SW Heat Exchanger Heat Transfer Rev. O Calculation for 2300 gpm Service Water Flow M 89-0016, 6/6/89 RHR SW Heat Exchanger Heat Transfer Rev. O Calculation for 4500 gpm Service Water Flow (4611NED.WP/che)

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i Page 1 of 1-Action Items List 1.

Establish a. periodic test program for Service Water System cross-header leakage to ensure leakage remains within the bounds assumed in Calculations C0050A 10, Rev. 2 and C0050A-12, Rev. 1.

Closed.,

Periodic Test procedures 1-PT-24.6.4 and 2-PT 24.6.4 have-been issued to assess SW system performance and cross-header leakage.

2.

Revise AOP-13.0. " Operation During Hurricane, Tornado, or Flood Conditions," to incorporate the restrictions specified in this rep 3rt for hurricane conditions (Section I.C).

Closed. Abnormal Operating procedure AOP-013 Rev. 7, has been issued to incorporate the appropriate restrictions.

3.

Establish an ISI SW pump performance lower limit based on analysis requirements and assumptions contained in this report (Section V.A).

Closed.

EER-90-0153 has been issued to establish the SW pump performance lower limit.

4.

Evaluate procedural cautions and local permanent caution tags for SW manual valves identified in Calculation G0050A-16,Section III.B.3.a and b (included asSection IV of this report).

Closed. The response to FACTS Item No. 90B0092 documents the evaluation of procedural cautions and caution tags.

5.

Approve TSI 89-02 controlling out-of-service time for RHR SW pumps during Modes 1, 2, and 3.

Closed. Technical Specification No. 89-02, Rev. O, has been issued.

o 6.

Initiate upgrade to address annunciator enhancements identified in setpoint review.

Open.

This action item is being tracked as FACTS Item No. 90B0340.

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