ML20148K597

Proposed Revised Tech Specs Re RCS

ML20148K597
Person / Time
Site:	Trojan File:Portland General Electric icon.png
Issue date:	03/23/1988
From:	PORTLAND GENERAL ELECTRIC CO.
To:
Shared Package
ML20148J724	List: ML20148J719 ML20148K597
References
TAC-66096, NUDOCS 8803310214
Download: ML20148K597 (1)

Text

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,' REACTOR COOLANT SYSTEM BASES The 10 GPM IDENTIFIED LL. MGE limitation provides allowance for a limited amount of leakage from known sources whose presence will not interfere with the detection of UNIDENTIFIED LEAKAGE by the leakage detection systems.

The CONTROLLED LEAKAGE limitation restricts operation when the total flow f rom the reactor coolant pump seals exceeds 20 GPM with the Reactor Coolant Pump seal return control valves full open at a raminal RCS pres-sure of 2230 psig. This limitation ensures that in the event of a LOCA, the safety injection flow will not be less than assumed in the accident analyses.

The total steam generator tube leakage limit of 1 GPM for all steam generators ensures that the dosage contribution from the tube leakage will be limited to a small f raction of Part 100 limits in the event of either a steam generator tube rupture or steam line break. The 1 GPM limit is consistent with the assumptions used in the analysis of these accidents.

The 500 gpd leakage limit per steam generator ensures that steam generator tube integrity is maintained in the event of a main steam line rupture as under LOCA conditions.

l l PRESSURE BOUNDARY LEAKAGE of any magnitude is unacceptable since it may be indicative of an impending gross failure of the pressure boundary.

Therefore, the presence of any PRESSURE BOUNDARY LEAKAGE requires the unit to be promptly placed in COLD SHUTDOWN.

Should leakage occur through a component which can be isolated from l the balance of the Reactor Coolant System, Plant operation may continue provided the leaking component is promptly isolated from the Reactor Coolant System since isolation removes the source of potential failure.

! 3 /4. 4. 7 CHEMISTRY The limitations on Reactor Coolant System chemistry ensure that l

corrosion of the Reactor Coolant System is minimized and reduces the potential for Reactor Coolant System leakage or failure due to stress corrosion. Aaintaining the chemistry within the Steady State Limits provides PJequate corrosion protection to ensure the structural integrity of the Reactor Coolant System over the life of the plant. The associated effects of exceeding the oxygen, chloride and fluoride limits are time l and temperature dependent. Corrosion studies show that operation may be continued with contaminant concentration levels in excess of the Steady State Limits, up to the Transient Limits, for the specified limited time intervals without having a significant effect on the structural integrity of the Reactor C(.cint System. The time interval permitting continued

) operation within the restrictions of the Transient Limits provides time for taking corrective actions to restore the contaminant concentrations to within the Steady State Limits.

TROJAN-UNIT 1 8 3/4 4-3 8803310214 880323 PDR ADOCK 05000344 P PDR

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