ML20059J813

Proposed Tech Specs Bases for Callaway TS 3/4.9.4, Containment Bldg Penetrations

ML20059J813
Person / Time
Site:	Callaway
Issue date:	01/19/1994
From:	UNION ELECTRIC CO.
To:
Shared Package
ML20059J804	List: ML20059J799 ML20059J813
References
NUDOCS 9402010193
Download: ML20059J813 (3)

Text

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3/4.9 REFUELING OPERATIONS BASES 3/4.9.1 BORON CONCENTRATION .

The limitations on reactivity conditions during REFUELING ensure that:

(1) the reactor will remain subcritical during CORE ALTERATIONS, and (2) a unifem boren concentration is maintained for reactivity control in the water volume having direct access to the reactor vessel. The limitation on K of nogreaterthan0.95issufficienttopreventreactorcriticalitydurin$ff refueling operations.

The locking closed of the required valves during refueling operations precludes the possibility of uncontrolled boron dilution of the filled portions of the Reactor Coolant System. This action prevents flow to the RCS of unborated water by closing flow paths from sources of unberated water.

These limitations are consistent with the initial conditions assumed for the boron dilution incident in the safety analyses.

3/4.9.2 INSTRUMENTATION The OPERABILITY of the Source Range Neutron Flux Monitors ensures that redundant eenitoring ca '

condition of the core. pability is available to detect changes in the reactivity 3/4.9.3 DECAY TIME The minimum requiremerit for reactor suberiticality prior to movement of irradiated fuel assemblies in the reactor vessel ensures that sufficient time l' has elapsed to allow the radioactive decay of the short-lived fission products.

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} This decay time is consistent with the assumptic is used in the fu 3/4.9.4 C0h7AINMENT SUILDING PENETRATIONS The requirements on containment building penetration closure and -

OPERABILITY will ensure be restricted from that atorelease leakage of radioactive material within containment the environment. The OPERABILITY and closure restrictions are sufficient to restrict radioactive material release i

I from a fuel element rupture based upon the lack of containment pressurization pctential while in the REFUELING MODE.

• The OPERABILITY of this system ensures the containment purge penetrations will be automatically isolated upon detection of high radiation levels within containment. The OPERABILITY of this system is required to restrict the release environment.

of radioactive caterials from the containment atmosphere to the The restriction on the setpoint for GT-RE-22 and GT-RE-33 is based on a fuel handling accident inside the Containment Building with resulting draage to one fuel red and subseouent release of 0.1% of the noble ga gap-activity, except for 0.3% of the Kr-85 qap-activity. The setpoint conce tration of SE-3 uCi/cc is equivalent to app eximately 150 mR/hr submersion do e rate.

3/4.9.5 COMMUNICATIONS rod rod' The requirement for cc:raunications capability ensures that refueling station personnel can be promptly informed of significant changes in the facility status or core reactivity conditions during CORE ALTERATIONS.

CALLAWAY - UNIT 1 8 3/4 9-1 Amendment No. N0' . 54 9402010193 940119 PDR ADOCK 05000483 p

PDR

3/4.'9 REFUELING OPERATIONS BASES 3/4.9.1 BORON CONCENTRATION The limitations on reactivity conditions during REFUELING ensure that: (1) the reactor will remain subcritical during CORE ALTERATIONS, and (2) a uniform boron concentration is maintained for reactivity control in the water volume having direct access to the reactor vessel. The limitation on K e rr of no greater than 0.95 is sufficient to prevent reactor criticality during )

refueling operations. The locking closed of the required valves l during refueling operations precludes the possibility of  !

uncontrolled boron dilution of the filled portions of the Reactor Coolant System. This action prevents flow to the RCS of unborated water by closing flow paths from sources of unborated water. These limitations are consistent with the initial conditions assumed for the boron dilution incident in the safety analyses.

3/4.9.2 INSTRUMENTATION The OPERABILITY of the Source Range Neutron Flux Monitors ensures that redundant monitoring capability is available to detect changes in the reactivity condition of the core.

3/4.9.3 DECAY TIME The minimum requirement for reactor subcriticality prior to movement of irradiated fuel assemblies in the reactor vessel ensures that sufficient time has elapsed to allow the radioactive decay of the short-lived fission products. This decay time is consistent with the assumptions used in the fuel handling accident radiological consequence and spent fuel pool thermal-hydraulic analyses.

3/4.9.4 CONTAINMENT BUILDING PENETRATIONS The requirements on containment building penetration closure and OPERABILITY ensure that a release of radioactive material within containment will be restricted from leakage to the environment. The OPERABILITY and closure restrictions are sufficient to restrict radioactive material release from a fuel I element rupture based upon the lack of containment pressurization  !

potential while in the REFUELING MODE.  !

The OPERABILITY of this system ensures the containment purge penetrations will be automatically isolated upon detection of high radiation levels within containment. The OPERABILITY of this system is required to restrict the release of radioactive materials from the containment atmosphere to the environment.

i CALLAWAY - UNIT 1 B 3/4 9-1 Amendment No. [, 54

3/4.9 REFUELING OPERATIONS BASES CONTAINMENT BUILDING PENETRATIONS (Continued)

The restriction on the setpoint for GT-RE-22 and GT-RE-33 is based on a fuel handling accident inside the Containment Building with resulting damage to one fuel rod and subsequent release of 0.1% of the noble gas rod activity, except for 0.3% of the Kr-85 rod activity. The setpoint conc?ntration of SE-3 pCi/cc is equivalent to approximately 150 AR/hr submersion dose rate.

3/4.9.5 COMMUNICATIONS The requirement for communications capability ensures that refueling station personnel can be promptly informed of significant changes in the facility status or core reactivity conditions during CORE ALTERATIONS.

CALLAWAY - UNIT 1 B 3/4 9-1 (a) AmendmentNo./ff,54

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