ML20096B293

Proposed Tech Spec Table 3.3-3,Item 6.C,allowing Change from Mode 4 to Mode 3 When Level Transmitter Inoperable

ML20096B293
Person / Time
Site:	Sequoyah
Issue date:	08/28/1984
From:	TENNESSEE VALLEY AUTHORITY
To:
Shared Package
ML20096B286	List: ML20096B283 ML20096B293
References
TVA-SQN-TS-59, NUDOCS 8409040077
Download: ML20096B293 (5)

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ENCLOSURE 1 PPOPOSED TECHNICAL SPECIFICATIONS SEQUOYAH NUCLEAR PLANT UNITS 1 AND 2 TVA-SQN-TS-59 I

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J v, TABLE 3.3-3 (Continued) 2 ,

gg -ENGINEERED SAFETY FEATURE ACTUATION SYSTEM INSTRUMENTATION R sx MINIMUM gi TOTAL NO. CHANNELS CHANNELS APPLICABLE

.-  ; FUNCTIONAL UNIT OF CHANNELS TO TRIP OPERABLE MODES ACTION

6. AUXILIARY FEEDWATER

a. Manual Initiation 2 1 2 1,2,3 24

b. Automatic Actuation 2 ,1 2 1,2,3 23'

, Logic '

c. Main Stm. Gen. Water Level-Low-Low

i. Start Motor

,, Driven Pumps 3/sta. gen. 2/sta. gen. 2/sta. gen. 1,2,3 16*

g any sta gen.

us ii. Start Turbine-

$ Driven Pump 3/sta. gen. 2/sta. gen. 2/sta. gen 1, 2, 3 16*

any 2 sta. gen.

d. S.I. .

Start Motor-Driven Pumps and Turbine Driven Pump See 1 above (r.11 S.I. initiating functions and requirements)

e. Station Blackout Start Motor-Driven Pump associated 2/ shutdown 1/ shutdown 2/ shutdown with the shutdown board board board 1, 2, 3 20 board and Turbine Driven Pump

f. Trip of Main Feedwater Pumps Start Motor-Driven Pumps and Turbine Driven Pump 1/ pump 1/ pump 1/ pump. 1, 2 20*

g. Auxiliary feedwater Suction Pressure-Low 3/ pump 2/ pump 2/ pump 1, 2,- 3 20*

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IABIE 3.3-3 (Continued) ,

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$. ENGINEERED SAFETY FLATURE ACTUATION SYSIEM INSIRtMENTATION . ')..

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E MINIMlM

, 10TAL NO. CilANNELS CilANNELS -APPLICABLE FUNCTIONAL UdlT OF CHANNELS 10 1 RIP OPLRAllLE MODES AC110N c-

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H 6. AUXILIARY tEEDWATLR eo

a. Mailual Initiation 2 1 2 1,'2, 3 24

b. Autoniatic Actuation 2 1 2 1,.2, 3- 23 logic

c. Main Sim. Gen. Water level-Low-Low

i. Start Motor Driven Pumps 3/sta. gen. 2/sta.. gen. 2/stia. gen. 1, 2, 3 16*

any sta gen.

J ii. Start Turbine-Driven Pts.p 3/sta. gen. 2/sta. gen. 2/sta.-gen 1, 2, 3 16*

2 any 2 stm. gen.

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Start Motor-Driven -

Pimeps and Turbine Driven Pump ,See I above (all S.I. initiating functions and requirements).

e. Station Blackout Start Motor-Driven Pump associated 2/ shutdown 1/ shutdown 2/ shutdown with the shutdown board board board 1, 2, 3 20 board and Turbine Driven Pump

f. Trip of Main Feedwater Piumps Start Motor-Driven '

l Pamips and Turbine

! Driven Pump 1/ pump 1/ pump 1/ptunp 1, 2. 208 l

l g. Auxiliary feedwater Suction Pressure-Low 3/ pump 2/ pump 2/ pump 1, 2, 3 ' 208 l

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. JUSTIUCATION FOR PROPOSED TECHNICAL SPECIFICATIONS TVA-SQN-?S-59 i

~ Description

This proposed technical specification change revises the action for item 6.o .

of table 3 3-3, by adding an asterik which mfers to the note that "the-provisions of specification 3.0.4 are not applicable. This change would allow a ' change from mode ~ 4 to mode 3 when a ' level transmitter is inoperable. -This change would also make item 6.o of table 3 3-3 consistent with item 5.

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2 Justification Limiting odndition for operation (LCO) 3.7.1.2 requires both motor-driven pumps and the turbine-driven pumps to be operable in modes 1, 2, and 3. This requimment will remain unchanged. LCO 3 3 2.1.b requires the mannel including the level transmitter (LT) to be operable to start the pumps in modes 1, 2, and 3. - when one channel- is inoperable, the aotion statement requires the bistable to be tripped within one hour, but operation may proceed until the next functional test. The same -&annel and ~ level transmitter is also used for turbine trip .and feedwater isolation (item 5). However, item 5 already has the asterik which refers to the note. Consistency in the

.+ requimments for this channel would enhance the ability of the operation staff to correctly apply the LCO.

This technical specification change will allow each unit to change modes after the bistable is tripped to the inoperable channel. If one channel is -

. inoperable, the ability to start.the pumps automatically is not hindered as two channels are operable to actuate to start the pumps with effectively a 1 out 2 logic on the remaining operable channels. The system functional capability is maintained and the margin of safety is not affected.. - There fore ,

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7 based on the attached significaat hazards determination that: (1) the proposed change does not constitute a significant hazards consideration as ,

defined by 10 CFR 50.92; and (2) there is masonable assurance that the health and safety of the public will not be endangered by the proposed change; and (3) this action will not msult in a condition which significantly alters the impact of the station on the environment as described in the NRC Environmental Statement. '

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• SIGNIFICANT HAZARDS CONSIDERATIONS '!

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1. Is the probability of an occurrence or the consequences of an accident previously evaluated in the safety analysis report significantly increased? No.

With one channel inoperable and placed in the trip' position in

,,.. accordance with action 16, the A W pumps will start if either of-the; two remaining channels trip. Thus a single failure to the operable channels will not prevent actuation.

2. , evaluated previously in the safety analysis report created?Is No. the possibili If one channel is inoperable, the ability to switch over suction automatically is not hindered as two. channels are operable to actuate and open ERCW valves with effectively a 1/2 logic on the remaining. operable channels.

3 Is the margin of safety significantly reduced? No.

LCO 3.7.1.2 still requires the pumps to be operable in modes 1, 2, and 3. This will remain unchanged. The logic is maintained within the action statement limits, and the system functional capability.

i is maintained.

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