ML20199J766

Proposed Tech Specs Pages,Revising Requirements for Main Station Batteries

ML20199J766
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	11/20/1997
From:	VERMONT YANKEE NUCLEAR POWER CORP.
To:
Shared Package
ML20199J764	List: BVY-97-155, Application for Amend to License DPR-28,proposing Mod to Revise Requirements for Main Station Batteries ML20199J766
References
NUDOCS 9711280222
Download: ML20199J766 (5)

Text

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, l t

Vernund Yankee Nuclear Power Corp. ,

Docket No. 50-271  !

BVY 97-155 ATTACl! MENT 3 REVISED TECliNICAL SPECIFICATION PAGES i

9711 22 971120 PDR A K 05000271 9 FDR l - _ _ _ _ . . . . _ , _ . _ . _ . . _ _ _ _ . _ . . _ _ ,,,_ _.._,, _ _ , _, _

VYNPS 3:10 LIMITING 00NCITIONS FOR 4.10 SURVEILLANCE REOUIREMENTS I OPr'PAff0N within 13 seconds l and accept the l emergency loads and I start each load within the specified starting time. The results shall be logged.

c. Each diesel fuel oil transfer pump shall be tested in accordance with Specification 4.6.E.

2. Pat t arv Systems 2. Pat t e rv systems The f ollowing ba t t e r*,' a. Every week ths systems shall be specific gravity, operable: temperature, level, and voltage of the

a. The four Neutron pilot cell and Monitoring and overall battery Process Radiation voltage shall be Batteries, measured and associated logged.

chargers, and 24 VDC Distribution b. Every three months Panels, the voltage, temperature, level,

b. The two main and specific station battery gravity of each systems consisting cell, and overall of battery voltage shall be measured

1. Bat t e ry A1, and logged.

Bat t e ry Charger A o /

(%P4 te/CFgr er/ A and Bus DC-1,

2. Ba t t e ry B1, Bat t e ry

_Charcer B)Fg o

(/Srdr# (ha'rger A

- and Bus DC-2.

Amendment No. 54, +46, 138 212

, VYNPS P ASFS t.

3.10 AUXfLTAPY ELECTRIC POWER SYSTEMS A. The objective of this Specification is to assure that adequate power will be available to operate the emergency safeguards equipment.

Adequate powar can be provided by any one of the following sources:

either of the startup transformers, backf eed through the main transformer, the 4160 volt line from the Vernon Hydroelectric Station or either of the two diesel generators. The backfeed through the noin transformer and 4160 volt Vernon line are both delayed access off-site power sourcen. Backfeeding through the main transformer can be accomplished by disconnecting the main generator f rom the main transf ormer and energizing the auxiliary transformer from the 345 kV switchyard through the main transformer. The time required to perform this disconnection is approxinately six hours.

The 4160 volt line from the Vernon Hydroelectric Station can be connected to either of the two emergency buses within seconds by simple manual switching operation in che Main Control Room.

Two 480 V Uninterruptible Power Systems supply power to the LPCIS valves via designated Motor Control Centers. The 480 V Uninterruptible Power Systems are redundant and independent of any on-site power sources.

This Specification assures that at least two off-site and two on-site power sources, and both 480 V Uninterruptible Power Systems will be available before the reactor is taken beyond *just critical' testing. In addition to assuring power source availability, all of the associated switchgear must be operable as specified to assure that the emergency cooling equipment can be operated, if required, from the power sources.

Station service power is supplied to the station through either the unit auxiliary transf ormer or the startup transformers. In order to start up the station, at least one startup transformer is required to supply the station auxiliary load. After the unit is synchronized to the system, the unit auxiliary transformer carries the station auxiliary load, except for the station cooling tower loads which are always supplied by one of the startup transformers.

The station cooling tower leads are not required to perform an engineered safety feature function in the event of an accidents therefore. an alternate source of power is not essential. Normally one startup transformer supplies 4160 volt Buses 1 and 3, and the other supplies Buses 2 and 4; however, the two startup transformers are designed with adequate capacity such that, should one become or be made inoperable, temporary connections can be made to supply the total station load (less the cooling towers) from the other startup transformer.

A battery charger is supplied for each battery. In addition, the two 125 volt station batteries have a spare charger available.

( 3ince pne parefl;5 oly stapon 9harg t is/vai(4blef one/sta y.on i batt9ty c arge/ ca be Allop d oyt of ervpte fqt m4{ntengnce And QepAirs. -

Power for the Reactor Protection System is supplied by 120 V ac

motor generators with an alternate supply from MCC-8B. Two

! redundant, Class 1E. seismically qualified power protection panels

! are connected in series with each ac power source. These panels provide overvoltage, undervoltagn, and underf requency protection for the system. Sotpoints are chosen to be cone 4 stent with the input power requirements of the equipment connected to the bus.

l Amendment No. B4, GB, +t9, FE4, 125 220 l

l

. e s ,

i VYNPS 5

3.10 LIMITING COI.DITIONS FOR 4.10 SURVEILLANCE REQUIREMENTS OPERATION within 13 seconds and accept the emergency loads and otart each load within the specified starting ,

t irne . The results shall be logged,

c. Each diesel fuel oil transfer pump shall be tested in accordance with Specification 4.6 E.

2. ),gttery Svetems 2. Battery Systems The following battery a. Every week the systems shall be specific gravity, operable temperature, level, and voltage

a. The four Neutron of the pilot cell Monitoring and and overall Process Radiation battery voltage Batterino, shall be measured associated and logged.

chargers, and 24 VDC b. Every three months Distribution the voltage, Panels. temperature, level, and

b. The two main specific gravity station battery of each cell, and systems consisting overall battery ofi voltage shall be measured and

1. Battery A1, logged.

Battery Charger A and Bus DC-1.

2. Battery B1, Battery Charger B and Bus DC-2.

Amendment No. M , MG, 138 212

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i

. O h VYNPS DhE2At 3.10 AUXILIARY RLECTRIC POWER SYSIf,113 A. The objective of this Specification is to assure that adequate power ,

will be available to operate the emergency safeguards equipment. 1 Adequate power can be provided by any one of the following sources:

either of the startup transformers, backfeed through the main transformer, the 4160 volt line from the Vernon Hydroelectric l Station or either of the two diesel generators. The backfeed through the main cransformer and 4160 volt Vernon line are both delayed access off-site power sources. Backfeeding through the main i transformer can be accomplished by disconnecting the main generator from the main transformer and energizing the auxiliary transformer from the 345 kV switchyard through the main transformer. The time  :

required to perform this disconnection is approximately six hours, t The 4160 volt line from the Vernon Hydroelectric Station can be connected to either of the two emergency buses within seconds by simple manual switching operation in the Main Control Room. ,

Two 480 V Uninterruptible power Systems supp)v power to the bpCIS valves via designated Motor Centrol Centers. The 400 V Uninterruptible Power Systems are redundant and independent of any on-site power sources.

This Specification assures that at least two off site and two on-site power sources, and both 400 V Uninterruptible Power Systems will be available before the reactor is taken beyond "just critical" testing. In addition to assuring power source availability, all of the associated switchgear must be operable as specified to assure that the emergency cooling equipment can be operated, if required, from the power sources.

Station service power is supplied to the station through either the unit auxiliary transformer or the startup transformers. In order to

start up the station, at least ene startup transformer is required to supply the station auxiliary load. After the unit is synchronized to the systern, the unit auxiliary transformer carries the station auxiliary load, except for the station cooling tower loads which arc always supplied by one of the startup transformers.

The station cooling tower loads are not required to perform an engineered safety feature function in the event of an accident; therefore, en alternate source of power is not essential. Normally one startup transformer supplies 4160 volt Buses 1 and 3, and the other supplies Buses 2 and 4; however, the two startup transformers are designed with adequate capacity such that, should one become or be made inoperable, temporary connections can be made to supply the total station .oad (less the cooling towers) from the other startup transformer.

A battery charger is supplied for each battery. In addition, the l two 125 volt station batteries have a spare charger available.

Power for the Reactor protection Slatem is supplied by 120 V ac motor generators with an alternate supply from MCC-8B. Two redundant, Class 1E, seismically qualified power protection panels are connected in series-with each ac power source. These panels provide overvoltage,.undervoltage, and underfrequency protection for the system. Setpoints are chosen to be consistent with the input power requirements of the equipment connected to the bus.

Amendment No, GG, 54, 444, 444, 125 220

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