ML20100J079

Proposed Tech Specs 3/4.9.4,revising Units 1 & 2 TS Bases Allowing Both Doors of Pal to Remain Open as Long One Pal Door Is Capable of Closing

ML20100J079
Person / Time
Site:	Comanche Peak
Issue date:	02/22/1996
From:	TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML20100J063	List: ML20100J061 ML20100J079
References
NUDOCS 9602280229
Download: ML20100J079 (2)

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t ATTACHMENT 2 TO TXX 96062 AFFECTED TECHNICAL SPECIFICATION PAGES l

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1 9602280229 960222 PDR ADOCK 05000445 P

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Attach = nt 2 to TXX 96062 Page 1 of 1 3/4.9 REFUELING OPERATIONS I

BASES l

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. These limitations are consistent with the initial conditions assumed for the boron dilution incident The value of 0.95 or less for K, boron concentration includes a 1% a k/k in the safety analyses.

Similarly, thN conservative allowance for uncertainties.

valua of 2400 ppm or greater includes a conservative uncertainty allowance of 50 ppm boron.

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

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 l

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 safety analyses.

3/4.9.4 CONTAINMENT BUILDING PENETRATIONS

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The requirements on containment building penetration closure and OPERABILITY ensure that a release of radioactive material withinfrom 1

containment will be restricted from leekege to the environment;;;inimized.

The OPERABILITY and closure restrictions are sufficient to restrict radioactive l

material release from a fuel element rupture based upon the lack of containment pressurization potential while in the REFUELING MODE.

Both containment'personnelr airlock doors mayibe?open7during' movement of irradiated fuel:or during; core; alterations provided one; airlock: door 1s capable.of being closed an[id water level?in the: refueling cavity is maintained as1 required..J Administrat vercontrols ensure-that81)Lappropriate; personnel'are SUP aware of the opennstatus-t.fathe' containment'during movement-of-irradiatedafuel or: CORE ALTERATIONS;t2)? spbcified zindividualstare designated and~available to close the airlockEfollowingfan:encuationEthat would: occur inithe eventioffa fuel: handling accident,(and 3)?any; obstructions;(e.gn ? cables;and hoses)3 hat t

could preventf rapidiclosure:off an;open; airlock!can.be;quiekly& removed.

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 ciuring CORE ALTERATIONS.

COMANCHE PEAK UNITS 1 AND 2 B 3/4 9 1