Text

Proposed Tech Specs Re Standby Liquid Control Sys
	ML20034C993
Person / Time
Site:	Grand Gulf
Issue date:	05/31/1990
From:	; SYSTEM ENERGY RESOURCES, INC.
To:	;
Shared Package
ML20034C992	List: AECM-90-0012, Application for Amend to License NPF-29,revising Tech Spec Re Reactivity Control Sys Standby Liquid Control Sys; ML20034C993;
References
	NUDOCS 9006050074
	Download: ML20034C993 (13)
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REACTIVITY CONTROL SYSTEMS 3/4.1.5 STANDBY LIQUID CONTROL SYSTEM LIMITING CONDITION FOR OPERATION i

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_)bUo 3.1. 5 4weastandby liquid control system subsystems shall be OPERABL APPLICABILITY:

OPERATIONAL CONDITIONS 1, 2 and 5*.-

i ACTION:

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a.

In OPERATIONAL CONDITION 1 or 2:

i NSERT 1.

With one system subsystem inoperable, restore the inoperable subsystem to OPERABLE status within 7 days or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

2.

With both standby liquid control system subsystems inoperable, restore at least one subsystem to OPERABLE status within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

b.

In OPERATIONAL CONDITION 5*:

1.

With one system subsystem inoperable, restore the inoperable subsystem to OPERABLE status within 30 days or insert all insertable control rods within the next hour.

2.

With both standby liquid control system subsystems inoperable, insert all insertable control rods within one hour.

i 54RT RVEILLANCE REQUIREMENTS 4.1.5 Each standby liquid control system subsystem shall be demonstrated OPERABLE:

Min oPrA4TzonAL coNezrnNs i,tand sW) a.

At least once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months by verifying that; ge g r.fhan oc 4 4 5 n

E 1.

The temperature of the sodium pentaborat_e solution isk.;itED l

the limite of figure 3.1.5 1.

(75*p dd len t6 or eqial % Go*P.

2.

The available volume of sodium pentaborate sol _ution ist: ;;= 1 then er ; quel to 4500 gallene.

@h the fikMs of #1gure 3,l,gg

= -

l NND 3.

The heat tracing circuit is OPERABLE by determiningJthe l

temperatureofthepumpsuctionpipingisgwitti-th: -limits of rwm.

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.s g reater +ha.--n er e9d to 7.50F and less tg g3 g

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"With any control rod withdrawn.

Not applicable to control rods removed per l

Specification 3.9.10.1 or 3.9.10.2.

GRAND GULF-UNIT 1 3/4 1-18 Amendment No. 41j l

9006050074 900531 DR ADOCL 05000416 j

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ip; INSERT A Page 3/4 1-18 p.

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In OPERATIONAL CONDITIONS 1, 2 AND $*:

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1.

Two subsystems, and j

b.

_In OPERATIONAL CONDITIONS 3#, 4# AND 5#:

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At least one division of heat tracing circuitry on the pumps suction I

piping.

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1 INSERT B Pago 3/4 1-18 j

c.

In OPERATIONAL CONDITIONS 1, 2, 3#, 4#, 5# and 5*:

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1.

With no heat tracing OPERABhE, restore at least one division of heat l~

tracing circuitry to OPERABLE status, and l

2.

If the pumps suction piping temperature decreases to loss than 75'F, declare both standby 11guid control system subsystems inoperable and

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perform Surveillanco Requirement 4.1.5.o.3 before declaring a standby 11guld control system subsystem OPERABLE.

3.

The provisions of Specification 3.0.4 are not applicable in OPERATIONAL CONDITIONS 3, 4, and 5.

d.

In OPERATIONAL CONDITIONS 1 AND 2:

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1.

With the sodium pontaborato concentration greator than 15.2 weight-percent and the not tank volume greator than or equal to 4281 gallons and less than or equal to 5088 gallons, verify the sodium pontaborate solution temperature to be greater than or equal to the standby liquid control system solution minimum temperaturo limit of Figure 3.1.5-1 once por 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months and restore _the sodium pontaborate solution to within the limits of Figures 3.1.5-1 and 3

3.1.5-2 within 72 hours8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months .

2.

Otherwise, declare both standby 11guld control system subsystems j

Inoperable and be in at least il0T SilVTDOWN within the next 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

i INSERT C Page 3/4 1-18

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that power _is available to at least one division of heat tracing circuitry and

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3-1 INSERT D Page 3/4 1-18 b.

At least once por 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months in OPERATIONAL CONDITIONS 3#, 4# and 5# b verifying the heat tracing is OPERABLE by determining that power is available to at least one division of heat tracing circuitry and the temperature of the pumps suction piping is greator than or equal to 75'F and loss that or equal-to 130'F.

A9101601/SNLICFLR - 18

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, pPE -SS/05 REACTIVITY CONTROL SYSTEMS i

SURVEILLANCE REQUIREMENTS (Continued) 1 At least once per 31 days by; 1.

Starting both pumps and recirculating demineralized water to the test tank.

2.

Verifying the continuity of the explosive charge.

3.

Determining that th v;.il;ble -eight of eedive penteLv et. l.

gr;;t:r th;n ;r ;;;;I t; 5000 lbe ;nd the concentration of boron in solution is within the limits of Figure 3.1.5-4 by chemical analysis.*

g 4.

Verifying that each valve, manual, power operated or automatic, in the flow path that is not locked, sealed, or otherwise i

secured in position, is in its correct position.

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h Demonstrating that, when tested pursuant to Specification 4.0.5, the minimum flow requirement of 41.2 gpm at a pressure of greater than or equal to 1300 psig is met, without actuation of the pump I

relief valve.

l l

@f.

At least once per 18 months during shutdown by; l

1.

Initiating one of the standby liquid control system subsystems, including an explosive valve, and verifying that a flow path from the pumps to the reactor pressure vessel is l

available by pumping demineralized water into the reactor vessel.

The replacement charge for the explosive valve shall be from the same manufactured batch as the one fired or from another batch which has been certified by having or,e of that batch successfully fired.

Both system subsystems shall be testad in 36 months.

I 2.

Demonstrating that the pump relief valve opens within 3% of the system design pressure and verifying that the relief valve does not actuate during recirculation to the test tank.

3.

-#*tfemonstrating that all heat traced piping between the storage tank and the reactor vessel is unblocked by pumping from the storage tank to the test tank and then draining and flushing the piping with demineralized water. 4 l

WERTy 4.

Demonstrating that the storage tank heater is OPERABLE by

=

verifying the expected temperature rise for the sodium pentaborate solution in the storage tank after the heator is energized.

This test shall also be performed anytime water or b is added to the l

l solution or when the solution temperature drops below -t-:

75'F limit of l-

"!;;r: 3.1.5-1.

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- n i : tett 15:1' :1:e 5: perf:r::d.;h:n:;;r b:th h::t tracir,g circuit; have b;Z f;Zd t; b; fi;;;r:bi; Zd Zy b; p;Tf;;-;;d by ;;y ;;TI;; Of ;;ee,,ti;I,

:rl::;fng er tet:1 '1:e p:th :t:p: :::h th:t th: :ntire fi:.; p;th i;

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GRAND GULF-UNIT 1 3/4 1-19 Amendment No. 41)

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This test may',be performed by any series of' sequential, overlapping or total il

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' flow path steps'such that the~ entire' flow path is'ine'Luded.

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5/4 1-20 AMENDMENT NC. 41j

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140 g

lUNACCEPTABLEOPERATICitj l ACCEPTABLE OPERATION l z

220 g

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110 STANDBY LIQUID CONTROL W

tu SYSTEM SOLUTION E 100 MINIMUM TD@ERATURE o

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CONCENTRATION (% BY WEIGHT)

FIGURE 3.1.5-1 SODIUM PENTABORATE SOLUTION TEMPERATURE / CONCENTRATION REQUIREMENTS

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q NOTE: The refe" ired ternperature rarige associated with the75 7 - 130*F acceptab operation region of inis figure is 1

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4200 4400 4600 4800 5000 P

E ET TANK VOLUME (GALLONS)

FIGURE 3,1.5-2 SODIUM PENTABORATE SOLUTION CONCENTRATK)N/AVAILABLE VOLUME REQUIREMENTS g

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' N PE4%E REACTIVITY CONTROL SYSTEMS L

BASES

'3 CONTR0t ROD PROGRAM CONTR0Q (Continued)

The RPCS provisas automatic supervision to assure that out-of sequence rods will not be withorewn or inserted. A rod is oct of sequence if it does not meet the criteria of the Banked Position Withdrawal $349ence as described

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in the FSAR.

The RPCS function is allowed to be bypassed in the Rod Action t-Control System (RACS) if necessary, for example, to insert an inoperable con-J trol red, return an out-of-sequence control ruc to the proper in-sequence position or sove an in-sequence contrcl rod to another in-sequence position.

The requirement that a second qualified individual verify such bypassing and i

post. ning of control rods ensures that the bases for kPts limitations are not exceeded.

In addition, if THERMAL POWER is below the iow power setpoint, s

additional restrictions are provided when bypassing control esds to ensure operation at all times within the basis of tha control red drop accident

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analysis.

The shalysis of the rod d op accident is presented in Section 15.4 of the FSAR and the technques of the analysis are presented in a topico? report, Reference 1, and two supplements, References 2 ano 3.

The RPCS is also designed to automatically prevent fusi damags in the event of erroneous rod withdrawal from localit,ns of high power den 61ty during higher power operation.

A dual channel system is provided that, above the low power setpoint, restricts the withdrawal distances of all non-peripheral control rods. This.

a restriction is greatest at highest power levels.

g 3/4.1.5 STANDBY LIQUID CONTROL SYSTEM The standby liquid control system provides a backup capability for bring-ing the reactor from full power to a ccid, xenon-free shutdown, assuming that

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the withdrawn control rods remain fixed in the rated power pattern. To meet this objective it is neces.;ary to inject a quantity of boron which producea a F

concentration of 660 ppe in the raector core in approximately 90 to 120 min-

? S-ir r n :i % w et&ty Of iS M g ll n: ?? r dt = ; r t r:t:-

h=8"utes.ce...ir :=ti ' g 1-mi-Arc :f M 5. Of ndi.; pct;.;t; is twired

= ;;ct : ;h td:r q uir;m t :f *. There is an adcitional allowence of 165 ppa in the reactor core to account for imperfect sixing and leakage. The time Nquirtatnt was selected to override the reactivity insertion rate due to cooldown following the xeno.. poison peak and the roovired pumping rate is The sinimum storage volume of t+ nhtis is established to allow l

41.2 goa.

for the portion below the pump suctnf that\\cannot be inserted. The tampera-1 i*

ture requirement is necessary tr unsa thaf the 4cdi_um pentator remains in t

I1 solution.

serr 1.

C. J. Paone, R. C. Stirn and J. A. Woolley, "R0d Drop Accident Analysis for Large BWR's," G. E. Topical Report NED0-10527, Marct.1972 4

2.

C. J. Paone, R. C. Stirn and R. M. Young, Supplement 1 to NED0-10527, g

July 1972 J. M. Haun, C. J. Paone and R. C. Stirn, Aodendus 2, "E.xposed Cores,"

3.

Supplement 2 to NEDO-10527, January 1973 GRAND GULF-UNIT 1 B 1/4 1-4 Amendment No. 41, -

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. J.NSERT_A_to Pege__B 3/4 1-4

. ' To meet the 37, shutdown requirement, the minimum required solution

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concentration at the design volume of 4530 gallons is 14.4 weight percent.

In order to establish this minimum concentration, it is necessary to have a minimum weight of 5803 pounds of sodios pentaborate.

INSERT B to Page_B_3]4.1-4 The sodium pontaborate solution is required to be maintainad above the minimum required concentration and below the maxiuum allowable concentration on Figure 3.1.5-2.

I

~A9101601/SNLICFLR - 21 i

m il Attcch=nt 4 to AECM*90/0012 L

Pag 3 1 SERI RESPONSES TO Tilt JULY 21, 1989 AND SEPTEMBER 29, 1989 NRC QUESTIONS NRC Questipn No. 1 Will the tank overflow if the temperature increases from 75'F to 130'F7 SER1_ Response The specific gravity of sodium pentaborate solution depends primarily on the solution' concentration.

Assume solution concentration is constant with respect to temperature and therefore, volumetric changes will be based on density changes of water with respect to temperature.

Tank ID = 108.0 in = 9.0 ft (Reference 1) 3 Tank volume por foot. = 63.62 ft /ft = 475.8 gal /ft liigh Alarm = 10'-9 7/8" = 10.82 f t = 688.6 f t3 = $151<1 gal *

(Reference 2) 3 The specific volume of water at 75'r, V75 = 0.01607 ft /lbm The mass of water in the tank at the high icvel alarm at 75'F ist 8

(688.6 ft )

,8 0 km

=

(0.01607 ft"/lbm)

The specific volume of water at 130 is V

= 0.01625 f b>m 130 (Reference 3)

The volume of 42,850 lbm of water at 130*F is:

3 (42,850 lbm) x (0.01625 ft /lbm) = 696.3 ft = 5208.7 gal 3

The volume increase is, therefore, 7.7, f t or 57.6 gal The level increase is 0.12 ft or about. 1-1/2 inches This corresponds to a level of 10.94 ft or 10'-11 3/8" This level is 4 5/8" below the bottom of the tank overflow at 11'-4" Therefore, as demonstrated by the results of the above calculation, the tank will not overflow if the temperature increases from 75'F to 130'F.

n

References:

1.

GE Drawing ~767E164 Rev. 7 2.'

Level Setting Diagram J-1603 Rev. 2 3.

Thermodynamic Properties of Steam, Keenan and Keyes

'* This volume is the total tank volume and includes the volume below instrument level r.oro at 6.125" above the tank bottom.

1 A9101601/SNLICFLR - 22

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Attech;ent 4 to AECM-90/0012 i

Paga 2 i

L NRC Question No._2 llow is the SLCS s. ction piping temperature measured?.Ilow are the

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. measurements recorded? If the tosperature drops below 75'F, how do we I

assure thst the solution hasn't solidified?

i SER1 Response The heat tracing provided for the SLCS pump suction piping consists of l

two independent subsystems. Each subsystem is supplied power from an i

independent power source. The primary subsystem heat tapes energize when i

the piping temperature reaches 85'F, decreasing.

The backup heat tapes energize when the piping temperature reaches 80'F, decreasing.

Both heat trace subsystem control panels are provided with " Power Available" l

lights, and power indicating LEDs-on each control module.

p The SLCS suction piping temperature is currently measured with a handheld i

pyrometer at four locations once overy 24~ hours, in all OPERATIONAL CONDITIONS.

The measurements are recorded in the operator daily logs, i

The power indicating lights for the heat tracing circuits and controllers i

are also currently checked once per 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months , in all OPERATIONAL L

!JONDITIONS. The results of heat tracing checks are presently recorded on l

the auxiliary building rounds sheets.

These will be moved to the i

operator daily logs (Technical Specification readings) upon approval of the proposed Specification.

Existing Technical Specification Surveillance 4.1.5.d.3 provides the corrective action required in the event the pump suction piping temperature drops below 'S*F.

This surycillance requires that all heat traced piping between the storage tank and the react or vessel be verified unblocked by pumping from the storage tank to the test tank.

This surveillance frequency and corrective action are consistent with the SLCS surveillance requirement s in the BWR Owners Group Improved BWR Technical Specifications (NEDC-31681).

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.I A9101601/SNLICFLR - 23 t

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g Attechnent 4 to AECM-90/0012 0

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N NRC Question No. 3 Provide additional information on tank heater design and how it assures L,

adequate mixing.

SERI Response i

The SLCS storage tank uses an operating heater for maintaining the minimum requirnd solution temperature (electric immersion type rated at 10 kw, 480

(

V, 3 phase, located approximately 8.9" above the tank bottom).

In addition to the operating heater, a mixing heater is used for the initial mixing of i

the tank contento during chemical addition (electric immersion type rated at 40 kw, 480V, 3-phase, located approximately at tank azimuth 270 degrees and 8.1" above the tank bottom).

The operating heater is controlled automatically using a temperature indicating controller (TIC) with a temperature element (TE) located -in a thermowell at approximately tank azimuth 330 degrees and 7.4" above the tank bottom.

This instrumentation maintains the solution temperature E

between 85'F-and 95'F.

The TE location prov! des a conservative temperature-measurement such that operation of the heater would not cause the TIC to short-cycle the heater.

In addition to this instrumentation, a temperature switch (TS) is located in a thermowell immediately below the TE approxiestely 2.4" above the tank bottom.

In conjunction with a remote trip unit, this TS provides a control room alarm if the tank solution temperature, measured at one of the coldest locations in the tank, falls to 80'F or lower.

The mixing heater is controlled manually using a local handswitch to aid in solution mixing during chemical addition. The electrical rating of this heater is sized to ensure complete dissolution and mixing of the sodium pentaborate solution.

In addition to the mixing heater, the tank is provided with a sparger along the tank bottom for solution mixing using either air or makeup water as needed.

- A9101601/SNLICTI.R - 24 r

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ML20034C993

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References:

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