ML20247E279

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Proposed Tech Specs Re Standby Liquid Control Sys
ML20247E279
Person / Time
Site: Fermi DTE Energy icon.png
Issue date: 05/11/1989
From:
DETROIT EDISON CO.
To:
Shared Package
ML20247E276 List:
References
NUDOCS 8905260192
Download: ML20247E279 (10)
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Text

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PROPOSED PAGE CHAIGES 890J2601Yi BYOU11 PDR ADOCK 05000341 l

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l REACTIVITY CONTROL SYSTEMS 3/4.1.5 STANDBY LIQUID CONTROL SYSTEM

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LIMITING CONDITION FOR OPERATION 8

l 3.1.5 The standby liquid control system shall be OPERABLE.

APPLICABILITY: OPERATIONAL CONDITIONS 1, 2, and 5*

ACTION:

a. In OPERATIONAL CONDITION 1 or 2:
1. With one pump and/or one explosive valve inoperable, restore the inoperable pump and/or explosive valve to OPERABLE status within 7 days or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
2. With the standby liquid control system otherwise inoperable, restore the system to OPERABLE status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or be in at least HOT SHUTDOWN within the next 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />.
b. In OPERATIONAL CONDITION 5*:
1. With one pump and/or one explosive valve inoperable, restore the inoperable pump and/or explosive valve to OPERABLE status within 30 days or insert all insertable control rods within the next hour.
2. With the standby liquid control system otherwise inoperable, insert all insertable control rods within I hour.

SURVEILLANCE REQUIREMENTS 4.1.5 The standby liquid control system shall be demonstrated OPERABLE:

a. At least once per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> by verifying that;
1. The temperature of the sodium entaborate solution is greater than or equal to 7ME 8*
2. The available volume of sodium pentaborate solution is within the limits of Figure 3.1.5-1.
3. 'h: 5::t tr :ing circuit i: OPERA 9LEbydet:r'in;"{'he temperature of the pump suction piping te-be 85 greater than or equal to .

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FERMI - UNIT 2 3/4 1-19

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I REACTIVITY CONTROL SYSTEMS SURVE1LLANCE REQUIREMENTS (Continued) ...

b. At least once per 31 days by:
1. Verifying the continuity of the explosive charge.
2. Determining that the concentration of boron in solution is within the limits of Figure 3.1.5-1 by chemscal analysis.* ,
3. Verifying that each valve (manual, power-operated, or automatic) )

in the flow path that is not locked, sealed, or otherwise secured in position, is in its correct position.

c. Demonstrating that, when tested pursuant to Specification 4.0.5, j the minimum flow requirement of 41.2 gpm at a pressure of greater l than or er,ual to 1i90 psig is met.
d. At least once per 18 months during shutdown by:
1. Initiating one of the standby liquid control system loops, including an explosive valve, and verifying that a flow path from the pumps to the reactor pressure vessel is available The by pumping demineralized water into the reactor vessel.

replacement charge for the explosive valve shall be from the C same manufactured batch as 'the one fired or from another batch which has been certified by having one charge of that batch successfully fired. Both injection loops shall be tested in 36 months.

2. Demonstrating that the pump relief valve setpoint is less than or equal to 1400 psig and verifying that the relief velve does not actuate during recirculation to the test tsnk.

Demonstrating that all 5::t tr:::d piping between the storage l 3.

tank and-tn. ....... ...... is unblocked by pumping from the expl orwe vakes storage tank to the test tank and then draining and flushing ..

the piping with demineralized water.** forumxtr9 Demonstrating that the storage tank heaters are OPERABLE ^by l 4.

verifying the expected temperature rise of the sodium pentaborate solution in the storage tank after the heaters are energized.

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M "This test shall also be performed anytime water or boron is added to the solu- l tion or when the solution temperature drops below the 79tE limit. ,yB'F hn: l

    • This test shall also be performed whenever I L:th 5::t tr::in :fr: it:d 8

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overlapping or total flow path steps such that the entire flow path is included.

3/4 1-20 FERNI - UNIT 2

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ELECTRICAL POWER SYSTEMS STANDBY LIQUID CONTROL SYSTEM' ASSOCIATED ISOLATION DEVICES LIMITING CONDITION FOR OPERATION e

3.8.4.5 All circuit breakers shown in Table 3.8.4.5-1 shall be OPERABLE.

APPLICABILITY: When standby liquid control system (SLCS) is required to be OPERABLE.

ACTION:

With one or more of the circuit breakers shown in Table 3.8.4.5-1 inoperable either:

a. Restore the inoperable circuit breaker (s) to OPERABLE status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, or
b. Trip the inoperable circuit breaker (s), rack out or remove the device from service within 3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> and verify the circuit breaker (s) to be racked out or removed from service at least once per 7 days thereaf ter, SLCS propria ACTION and declare they !'_Cgoperable

,and& a preifde requsret y the pon 3.1.5 etstr--t fer. {c..:

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C SURVEILLANCE REQUIREMENTS 4.8.4.5 Each of the above required circuit breaker (s) shall be demonstrated OPERABLE:

a. At least once per 18 months by performing a CHANNEL CALIBRATION of the associated protective relays and a CHANNEL FUNCTIONAL TEST of each breaker which includes simulation of actuation of the system and verifying that each relay and associated circuit breaker and over-current control circuits functions as designed.
b. At least once per 60 months by subjecting each circuit breaker to an inspection and preventive maintenance in accordance with procedures prepared in conjunction with its manufacturer's recommendations.

W The requirement $ lo apply the offrefrmie ACr/D^l os. rega,re 3.L 5 is m i repared for wperoffe SLC Nank heder ctroud bruker0) pre {el 4 efter reporemedt of Acrtw 3 8.y.s.b are cwpf FERMI - UNIT 2 3/4 8-26 i

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TABLE 3.8.4.5-1 1 STANDBY LIQUID CONTROL SYSTEM ASSOCIATED ISOLATION DEVICES 480 V MOTOR CONTROL CENTERS

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".00 70" t'.

";;iti;n % OLO iket Tre;; A-MCC 728-4C j Position 2AR SLC Pump A MCC 72C-4A Position SC SLC Heater A "00 72: 40 l

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Position 2B SLC Pump B Position 2CR SLC Heater B l

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Amendment No. 22 FERMI - UNIT 2 3/4 8-27

REACTIVITY CONTROL SYSTEMS )

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BASES S EE J N5f47~ B M V./.5 -

3/4.1.5 STANDBY LIQUID CONTROL SYSTEM The standby liquid control system provides backup capability for brin he

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the reactor from full power to a cold, Xenon-free shutdown, assuming t withdrawn control rods remain fixed in the rated power pattern, eet this objective it is necessary to inject a quantity of boron whistemsroduces a concen-connected to tration of 660 ppm in the reactor core and other pipi the reactor vessel. To allow for potential leakd concentration is achieved by and improper mixing this concentration is increased by 25%. The re having a minimum available quantity o lbs of 0 gallons of sodium pentaborate solution containing a minimum of sodium pentaborate. This quantity of solution is a net amoun ich is above the pump suction, thus allowing for the portion which can e'njected. The pumping rate of 41.2 gpm provides a negative reacti insertion rate over the permissible pentaborate solution volume ra , which adequately compensates for the positive reactivity effects due emperature and xenon during shutdown. The temperature requirement is essary to ensure that the sodium pentaborate remains in solution.

With redundant pumps and explosive injection valves and with a highly reliable control rod scram system, operation of the reactor is permitted to continue for short periods of time with the system inoperable or for longer periods of time wi.th one of the redundant components inoperable. *---srs meu 5 W./.5g Surveillanen requirements are established on a frequency that assures a high reliability of the system. Once the solution is established, boron con-centration will not vary unless more boron or water is added, thus a check on the temperature and volume once each 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> assures that the solution is available for use. e Replacement of the explosive charges in the valves at regular intervals will assure that these valves will not fail because of deterioration of the charges.

1. C. J. Paone, R. C. Stirn and J. A. Woolley, " Rod Drop Accident Analysis for Large BWR's", G. E. Topical Report NED0-10527, March 1972.
2. C. J. Paone, R. C. Stirn and R. M. Young, Supplement 1 to NEDO-10527, July 1972.
3. J. M. Haun, C. J. Paone and R. C. Stirn, Addendum 2. " Exposed Cores",

Supplement 2 to NED0-10527, January 1973.

't. Genseal Electric C9 L.scusir,g Topocal Ryert " Anlidated

%nssent 10CTRS*0 kMhout62Scrm ' P- A dafed

' HEDE- 3100tesponse. Febraaey 1987. b the NAC Aru/5 Rule, Anelysis of Boron-10 enrichmertt each IB modhs provides sufReied a55arance + hat +he. minimam enrichmerf of Boron-/O wd/ Le, masn%ed.

FERMI - UNIT 2 B 3/4 1-4

4 INSERT B 3/4.1.5 The design objective of the Standby Liquid Control (SLC) System is two fold. One objective is to provide backup capability for bringing the reactor from full power to a cold, Xenon-free shutdown, assuming that the withdrawn control rods remain fixed in the rated power pattern.

The second objective of the SLC System is to meet the requirement of the ATWS Rule, specifically 10CFR50.62 paragraph (c)(4) which states that, in part:

"Each boiling water reactor must have a standby liquid control system (SLCS) with a minimum flow capacity and boron content equivalent in control capacity to 86 gallons per minute of 13 weight percent sodium pentaborate solution."

The SLC System uses enriched Boron-10 (contained in the sodium pentaborate solution) to comply with 10CFR50.62 paragraph (c)(4). The methods used to determine compliance with ATWS Rule are in accordance with Reference 4.

To meet both objectives, it is necessary to inject a minimum quantity of 2350 net gallons of 65 atom percent Boron-10 enriched sodium pentaborate in a solution having a concentration of no less than 9.0 weight percent (see Figure 3 1.5-1 for equivalent volumes and concentration ranges). The equivalent concentration of natural boron reguiredtoshutdownthereactoris660partspermillion(ppm)inthe 70 F moderator, including the Recirculation loops and with the RHR Shutdown Cooling Subsystems in operation. In addition to this, a 25 percent margin is provided to allow for leakage and imperfect mixing (825 ppm). The pumping rate of 41.2 gpm provides a negative m reactivity insertion rate over the permissible sodium pentaborate solution volume range, which adequately compensates for the positive reactivity effects due to moderator temperature reduction and xenon decay during shutdown. The temperature requirement is necessary to ensure that the sodium pentaborate remains in solution.

INSERT 3/4.1.5.a The SLC tank heaters are only required when mixing sodium pentaborate and/or water to establish the required solution operating parameters during additions to the SLC tank. Normal operation of the SLCS does not depend on these tank heaters to maintain the solution above its saturation temperature. Technical requirements have been placed on the tank heater circuit breakers to ensure that their failure will not degrade other SLC components (see Specification 3/4.8.4.5).

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. , 1 ELECTRICAL POWER SYSTEMS BASES f

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3/4.8.4 ELECTRICAL EQUIPMENT PROTECTIVE DEVICES  !

Primary containment electrical penetrations and penetration conductors are protected by either de-energizing circuits not required during reactor operaticn or demonstrating the OPERABILITY of primary and backup overcurrent protection circuit breakers by periodic surveillance.

The surveillance requirements applicable to lower voltage circuit breakers and fuses provide assurance of breaker and fuse reliability by testing et least one representative sample of each manufacturers brand of circuit breaker and/or fuse. Each manufacturer's molded case and metal case circuit breakers and/or fuses are grouped into representative samples which are then tested on a rotating basis to ensure that all breakers and/or fuses are tested, If a wide variety exists within any manufacturer's brand of circuit breakers and/or fuses, it is necessary to divide that manufacturer's breakers and/or fuses into groups and treat each group as a separate type of breaker or fuse for surveillance purposes.

The OPERABILITY of the motor operated valves thermal overload protection ensures that the thermal overload protection will not prevent safety related valves from performing their function. The Surveillance Requirements for demonstrating the OPERABILITY of the thermal overload protection are in accordance with Regulatory Guide 1.106 " Thermal Overload Protection for Electric Motors on Motor Operated Valves," Revision 1, March 1977.

Circuit breakers actuated by fault currents are used as isolation devices to protect equipment associated with the Standby Liquid Control System. The OPERABILITY of these circuit breakers will ensure that the SLCS equipment is protected in the event of faults in the loads powered by these circuit breakers.

The SLC kk hederc are. only repared when mNGJ pdun ytebNr"N

,a M pa,waehr.r.

adbr wake -lo esMlah & regubd w/aw on f fan /c healers

//ctntf opra&M ef & SLCS does ad k m a s /cin di Sc/&wn above $ sab<m k femperakus . Tcci -

%e. hnN nica0 Spec [haMn reguarcmoTo have jeen placed' on heqhr- cmciuf breaWees $<> en f ure Sai fh eir '[a t lukt wbll nof &ak dk SLC compo u e da . ,

t FERMI - UNIT 2 8 3/4 8-3

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