ML20217B616

Proposed Tech Specs Bases Section B3/4.9.2,adding Info Re Role of Source of Power Supplied to One Source Range Neutron Flux Monitor in Determining Operability of Monitor in Mode 6

ML20217B616
Person / Time
Site:	Wolf Creek
Issue date:	09/19/1997
From:	WOLF CREEK NUCLEAR OPERATING CORP.
To:
Shared Package
ML20217B615	List: ML20217B607 ML20217B616
References
NUDOCS 9709300090
Download: ML20217B616 (1)

Text

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At t a chttent 11 to ET 97-0112 Tage 2 ut 2 3/4 9 REFUELING OPERATIONS BASES 3/4 9.1 BORON CONCENTRATION The limitations on reactivity conditions during REFUELING ensure that:

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(1) the reactor will remain subcntical dunng CORE ALTERATIONS, and (2) a uniform boron concentration is maintained for reactivity control in the water l

volume having direct access to the reactor vessel The limitation on K, of no greater than 0 95 is sufficient to prevent reactor enticality during 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 Coclant System. This action prevents flow to the RCS of unborated water by closing flow paths from sources of unborated water. These hmitations 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 rodundant monitoring capability is available to detect changes in the reactivity condition of the core. When any of the safety related busses supplying power to one of the detectors (SE NI 31 or 32) associated with the Source Range Neutron Flux Monitors are taken out of service, the correrponding Source Range Flux Monitor may be considered OPERABLE when its detector is powered from a temporary non safety related source of power, provided the detector for the opposite Source Range Neutron Flux Monitor is powered from its normal power source.

When determining comphance with action statement requirements, addition to the RCS of boratad water with a concentration greater than or equal to the minimum required RWST concentration shall not be considered to be a positive reactivity change.

3/4 9 3 DECAY TIME l The minimum requirement for (eactor subenticality prior to movement of irrad:ated 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 safety 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 minimized. The OPERABILITY and closure restrictions are sufficient to restrict radioactive material release from a fuel 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 hig3 radiation levels within enntainment. The OPERABILITY of this system is required to restrict the release of radioactive materials from the containment atmosphere to the environment.

WOLF CREEK - UNIT 1 B 3/4 9-1 Amendment No. 3444 9709300090 970919 PDR ADOCK 05000402 P PDR

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