ML20247B941

TS Change Pages for TS Bases Section 3/4.5.4,modifying Wording Associated W/Refueling Water Storage Tank Minimum Boron Concentration

ML20247B941
Person / Time
Site:	Millstone
Issue date:	05/01/1998
From:	NORTHEAST NUCLEAR ENERGY CO.
To:
Shared Package
ML20247B937	List: B17210, Application for Amend to License NPF-49,revising TS 3/4.5.4 Re Refueling Water Storage Tank Min Boron Concentration ML20247B941
References
NUDOCS 9805110156
Download: ML20247B941 (3)

Text

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2/12/98 EMERGENCY CORE COOLING SYSTEMS BASES

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3/4.5.4 REFUELING WATER STORAGE TANK The OPERABILITY of the refueling water storage tank (RWST) as part of the ECCS ensures that a sufficient supply of borated water is available for injec-tion by the ECCS in the event of a LOCA. The limits on RWST minimum volume and boron concentration ensure that: (1) sufficient water is available within ontainment to p ore, and rc.E5rTM.ygrecirculation cooling flow.. t.g_thgSF;;g

...... suSitidTTFT!lt "did~cdfidilica ;ix;n;; cf the R"ST and the RCS weter veluii,es with 211 centrol rods inscried-except fer the-

= cst rccctivc cc,ntral asscr.bly. These assu;;;ptions cre ccasistent with the wun

_w The contained water volume limit includes an allowance for water not usable because of tank discharge line location or other physical characteristics.

The limits on contained water volume and boron concentration of the RWST also ensure a pH value of between 7.0 and 7.5 for the solution recirculated -

within containment after a LOCA. This pH band minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

The maximum / minimum solution temperatures for the RWST in MODES 1, 2, 3 and 4 are based on analysis assumptions.

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MILLSTONE - UNIT 3 B 3/4 5-2a Amendment No. J9p, /q 157 0567

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Docket No. 50-423 B17210 I

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Attachment 3 Millstone Nuclear Power Station, Unit No. 3 Retyped Technical Specification Page 1 1

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l May 1998 l

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• EMERGENCY CORE COOLING SYSTEMS BASES '

. i 3/4.5.4 REFUELING WATER STORAGE TANK j The OPERABILITY of the refueling water storage tank (RWST) as part of the ECCS ensures that a sufficient supply of borated water is available for injec-tion by the ECCS in the event of a LOCA. The limits on RWST minimum volume and boron concentration ensure that: (1) sufficient water is available within containment to permit recirculation cooling flow to the core, and (2) the reactor will remain subcritical in the cold condition following a large break (LB) LOCA, assuming snixing of the RWST, RCS, ECCS water, and other sources of water that may eventually reside in the sump, with all control rods assumed to be out. These assumptions are consistent with the LOCA analyses.

The contained water volume limit includes an allowance for water not usable because of tank discharge line location or other physical characteristics.

The limits on contained water volume and boron concentration of the RWST also ensure a pH value of between 7.0 and 7.5 for the solution recirculated q within containment after a LOCA. This pH band minimizes the effect of chloride and caustic stress corrosion on mechanical systems and components.

The maximum / minimum solution temperatures for the RWST in MODES 1, 2, 3 and 4 are based on analysis assumptions. ,

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MILLSTONE - UNIT 3 8 3/4 5-2a Amendment No. JJ/, JJ7, osse t .___.________o