ML18033B277

Proposed Tech Specs,Removing Ref to Fixed in Line Rotometer Listed in Table 3.2.D Under Radwaste Effluent Instrumentation

ML18033B277
Person / Time
Site:	Browns Ferry
Issue date:	04/19/1990
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML18033B276	List: ML18033B275 ML18033B277
References
NUDOCS 9004300069
Download: ML18033B277 (6)

Text

H i in Hinimum Channels 0%'4'O ZO'a)

1. LI(UID RADWASTE EFFLUENT A, B VO 00 AO,"

HONITOR (RH-90-130) 04 VlO

2. RHR SERVICE WATER HONITOR 00 04 (RH-90-133, -134)

DO~

eve AQI 3. RAW COOLING WATER HONITOR (RH-90-132)

4. LIQUID RADWASTE EFFLUENT FLOW RATE (77-60 loop)

BFN-Unit 1

ELK ~

Hinimum Channels

1. LI(QUID RADWASTE EFFLUENT A, B YONITOR (RH-90-130)

2. RHR SERVICE MATER HONITOR (RM-90-133, -134)

3. RAW COOLING WATER HONITOR (RH-90-132)

4. LI(}UID RADWASTE EFFLUENT FLOW RATE (77-60 loop)

BFN-Unit 2

i iv i i f f1 H i in Minimum Channels

~i~n li 1'.

LIi)UID RAOWASTE EFFLUENT A, B HONITOR (RH-90-130)

2. RHR SERVICE WATER MONITOR (RM-90-133, -134)

3. RAW COOLING WATER MONITOR (RM-90-132)

4. LI()UIO RAOWASTE EFFLUENT FLOW RATE (77-60 loop)

BFN-Uni t 3

ENCLOSURE 2 DESCRIPTION AND JUSTIFICATION BRONNS FERRY NUCLEAR PLANT (BFN)

REASON FOR CHANGE The BFN technical specifications for units 1, 2, and 3 are being revised to remove reference to the fixed in line rotometer listed in the Table 3.2.D under radwaste effluent instrumentation.

DESCRIPTION AND JUSTIFICATION FOR THE PROPOSED CHANGE Existing Table 3.2.D currently reads:

4. LIQUID RADHASTE EFFLUENT FLON RATE (77-60 loop excluding fixed in line rotometer)

Proposed change to Table 3.2.D would read:

4. LIQUID RADNASTE EFFLUENT FLOH RATE (77-60 loop)

Justification for proposed change to Table 3.2.D:

This technical specification change is necessitated by a modification to the radwaste system which will replace the existing non-safety related high and low flow loop radwaste discharge line rotometer flow indicating transmitters with a single ultrasonic transit time flowmeter. The ultrasonic flowmeter will be installed on a common radwaste discharge line and will measure any effluents being discharged. This modification is being made because the existing rotometers do not demonstrate the desired flow measurement accuracy or reliability. The attached sketch shows the location of'he new clamp on ultrasonic flowmeter transducers at A. The location of the old rotometers is at 8 and C.

The liquid radwaste system collects, processes, stores, and disposes of all radioactive liquid wastes. The sources of radioactive liquid wastes are primarily from equipment drain sumps, reactor cleanup systems, decant from the cleanup and condensate phase separators, floor drain sumps, the chemical waste tank, Residual Heat Removal system, laboratory and decontamination drains, the radwaste building floor drain sump, radioactive laundry operations, and decontamination solutions containing detergents.

The ultrasonic flowmeter is part of the control loop which controls, measures, and records the flowrate of the radwaste liquid effluent discharge. This control loop is not required for safe shutdown of the plant, but it does monitor and control the flow of normal offsite discharges to ensure compliance with the requirements of 10 CFR 20. Malfunctions of the flow measurement and recording loop (of which the new ultrasonic flowmeter is a part) can be compensated for by alternate measurement techniques detailed in plant surveillance instructions.

The proposed modification does not adversely impact the normal radioactive effluent discharge concentrations from the radwaste system, so there will be no increase in the radiological dose to the public. No accidents, transients, or events described in the plant Safety Analysis Report are initiated by failure of this flowmeter or the control loop of which it is a part. The modification will in fact enhance the accuracy and reliability of equipment used to measure .liquid radwaste discharges.

ENCLOSURE 3 DETERMINATION OF NO SIGNIFICANT HAZARDS CONSIDERATION BROHNS FERRY NUCLEAR PLANT (BFN)

UNITS 1, 2, AND 3 DESCRIPTION OF PROPOSED TS AMENDMENT The proposed amendment would change the BFN Technical Specifications for Units 1, 2, and 3 to identify that the instrumentation used to monitor the liquid radwaste effluent flow rate no longer uses a fixed in line rotometer as noted in Table 3.2.D.

BASIS FOR PROPOSED NO SIGNIFICANT HAZARDS CONSIDERATION DETERMINATION NRC has provided standards for determining whether a significant hazards consideration exists as stated in 10 CFR 50.92(c). A proposed amendment to an operating license involves no significant hazards considerations if operation of the facility in accordance with the proposed amendment would not (1) involve a significant increase in the probability or consequences of an accident previously evaluated, or (2) create the possibility of' new or different kind or accident from an accident previously evaluated, or (3) involve a significant reduction in a margin of safety.

1. The proposed amendment does not involve a significant increase in the probability or consequences of an accident previously evaluated. The new instrumentation provides improved performance of the monitoring loop and does not affect the function, operation, or qualification of any components associated with the radwaste system. There are no accidents previously evaluated which would be initiated by a failure of a component associated with this monitoring loop.

2. The proposed amendment does not create the possibility of a new or different kind of accident previously evaluated. The upgrading of the existing non-safety related flow measuring instrumentation has no impact on any safety-related components of the radwaste system or its associated equipment.

3. The proposed amendment does not involve any significant reduction in a margin of safety. The upgrading of these non-safety related components will not cause the acceptance limit for any accident analysis to be exceeded, nor does it change any margin of safety. This change will have no effect on the concentrations or flow rates of radioactive effluents and will enhance TVA's ability to monitor flow rates to ensure compliance with 10 CFR 20.

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