ML19210B263

Proposed Change 2 of Tech Spec 3.4 Re Turbine Cycle

ML19210B263
Person / Time
Site:	Three Mile Island
Issue date:	06/03/1974
From:	METROPOLITAN EDISON CO.
To:
Shared Package
ML19210B262	List: ML19210B261 ML19210B263
References
NUDOCS 7911050478
Download: ML19210B263 (1)

Text

. ,

• 2end=ent No. 2

. Change No. 2 3.h TURBINE CYCLE Applicability Applies to the operating status of the_ turbine cycle when fuel is in the core and the capability of the decay removal system is exceeded.

Cbjective To specify minimum conditions cf the turbine cycle steam relieving capacity and emergency feedvater pumps to ensure capability to remove decay heat equivalent to five percent of full power.

Specification The reactor coolant system shall not be heated above 250C F unless the folleving conditions are cet:

3.h.1 Eighteen main steam safety valves shall be operable.

3.h.2 Four of the six turbine by-pass valves are opesable.

3.h.3 The turbine driven emergency feedvater pu=p and two half-sized =ctor-driven emergency feedvater pumps shall be operable.

3.k.h A minimun of 150,000 gallens of condensate available in the condensate storage tanks.

3.h.5 System piping and valves, directly associated with the above ec=ponents operable.

3.h.6 Any component in 3.h.3 cr 3.h.5 above, may be re=cved frc=

service for purposes of =aintenance for a period not to ex_ceed h8 hours. If this period is exceeded, phe unit will be placed in the cold shutdevn condition within 12 hcurs thereafter.

3.h.7 One of the emergency feedvater pumps required by 3.h.3 l

=ay be removed frc= service for maintenance indefinitely provided that the reacter has never been cperated at greater than 5% of rated thermal power.

Bases A reactor shutdevn from power requires re=cval of core decay heat. Normal decay heat rencval is by the steam generator with the steam dump to the condenser when system temperature is abcve 2500F and by the decay heat removal syste below 250 F. Therefcre, core decay heat can be centinucusly dissipated up to 15 percent of full pcVer via the steam bypass to the ccndenser as feedvater in the steam generator is converted to steam by heat absorption. Ucr= ally, the capability to return feedwater flew to the stes generators is provided by the main feedvater system.

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