ML20058G986

Proposed Tech Specs Addendum to TS Change Request 156, Sections 15.3.7 & 15.4.1-2,proposing Surveillance for DG Room Exhaust Fans

ML20058G986
Person / Time
Site:	Point Beach
Issue date:	11/30/1993
From:	WISCONSIN ELECTRIC POWER CO.
To:
Shared Package
ML20058G984	List: ML20058G979 ML20058G986
References
NUDOCS 9312100209
Download: ML20058G986 (9)

Text

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1 15.3.7 AUXILIARY ELECTRICAL SYSTEMS Applicability Applies to the availability of off-site and on-site electrical power for plant '

power operation and for the operation of plant auxiliaries.

l Ob.iective To define those conditions of electrical power availability necessary (1) to .,

provide for safe reactor operation, and (2) to provide for the continuing i availability of engineered safeguards. ,

Snecification  !

A.1 Under normal conditions neither one nor both reactors shall be made l critical unless the following conditions are met: [

l

a. At least two 345 KV transmission lines are in service.  ;

b. The 345/13.8 KV and the 13.8/4.16 KV station auxiliary transformers l associated with the reactor (s) to be taken critical are in service;  ;

or one 345/13.8 KV station auxiliary transformer and the associated  !

13.8/4.16 KV station auxiliary transformer (s) are in service with the gas turbine operating. -

c. 4160 Volt unit supply buses A03 and A04 for the unit to be taken j critical are energized from their normal supply.

d. 4160 Volt safeguards buses A05 and A06 for the unit (s) to be taken i critical are independently energized from their normal supply and  !

both units' A05/A06 bus tie-breakers are removed from their cubicles. ,

e. 480 Volt buses B03 and B04 for the unit (s) to be taken critical are  ;

independently energized from their normal supply and both units'  ;

B03/B04 bus tie-breakers are open with control power removed. l

\

f. A fuel supply of 11,000 gallons is available; and both diesel  !

generators are operable.  !

g. Four of the five safety-related station batteries and all four of the main DC distribution systems are operable.

h. Four battery chargers are operable with one charger carrying the DC loads on each main DC distribution bus: D01, D02, D03 and D04. I u

9312100209 DR 931130 I p ADDCK 05000266  !

PDR  !

Unit 1 - Amendment No. 15.3.7-1 Unit 2 - Amendment No.

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shdg10ff6Ethsliid}f(iEt616sIfiitkhMEFKifilTire energfiFdiff6iiils  ;

sifstEFelind?ihiEFtiF4 A.2 Under abnormal conditions one reactor may be made critical providing the  ;

following conditions are met: l

a. One 345 KV transmission line is in service; or the gas turbine is operating. i

b. The 345/13.8 KV and the 13.8/4.16 KV station auxiliary transformers associated with the unit to be taken critical are in service; or the I associated 13.8/4.16 KV station auxiliary transformer is in service  ;

and the gas turbine is operating. ,

c. Reactor power level is limited to @% rated power until 2 or more t transmission lines are restored to service. j

d. 4160 Volt buses A03 and A04 for the unit to be taken critical are energized from their normal supply.  !

e. 4160 Volt safeguards buses A05 and A06 for the unit to be taken critical are independently energized from their normal or emergency  ;

power supply and both units' A05/A06 bus tie-breakers are removed from their cubicles. 1 J

f. 480 Volt safeguards buses B03 and B04 for the unit to be taken critical are independently energized from their normal or emergency power supply and both units' B03/B04 bus tie-breakers are open with j control power removed.

g. A fuel supply of 11,000 gallons is available; and both diesel generators are operable,

h. Four of the five safety-related station batteries and all four of the main DC distribution systems are operable.

i. Four battery chargers are operable with one charger carrying the DC loads of each main DC distribution bus: D01, D02, D03 and D04.

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l Unit 1 - Amendment No. 15.3.7-2 Unit 2 - Amendment No.

i B.1 During power operation of one or both reactors, the requirements of j 15.3.7.A.1 may be modified to allow the following arrangements of systems  ;

and components:  ;

a. If the 345 KV lines are reduced to only one, any operating reactor (s) must be promptly reduced to, and limited to, 50% power. If all  :

345 KV lines are lost, any operating reactor (s) will be reduced to supplying its auxiliary load, until one or more 345 KV transmission lines are again available. i

b. If both 345/13.8 KV auxiliary transformers are out of service and only the gas turbine is operating, only one reactor will remain operating and it will be limited to 50% power. The second reactor  !

will be placed in the hot shutdown condition. l

c. If the 13.8/4.16 KV auxiliary transformers are reduced to only one, (

the reactor associated with the out of service transformer must be placed in the hot shutdown condition. ,

d. Either bus A03 or A04 may be out of service for a period not j exceeding 7 days provided both diesel generators are operable and  ;

the associated diesel generator is operating and providing power ,

to the engineered safeguard bus normally supplied by the out of j service bus.

e. With a unit in cold or refueling shutdown, one pair of buses, A05 and A06 or B03 and B04, for that shatdown unit, may be tied together through their common tie breaker for up to 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. If the tie l breaker cannot be opened or the conditions of 15.3.7.B.I.f met within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />, the operating unit shall be placed in the hot shut- ,

down cordition within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown within the ,

following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

f. With a unit fully defueled, one pair of buses for the defueled unit, A05 and A06 or B03 and B04, may be tied together through their common

• tie-breaker in excess of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> provided: ,

1) An evaluation is performed to show that the loads that remain or can be energized by the buses will not cause a potential  ;

overload of the associated diesel generator. The applicable l Limiting Conditions for Operation of the equipment removed from service shall be entered for the operating unit. )

2) A single train of spent fuel cooling is adequate to cool the I spent fuel pool.

I Unit 1 - Amendment No. 15.3.7-3 l Unit 2 - Amendment No. I i

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This LCO shall not be allowed in conjunction with e. or f. above.

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h. One of the four connected safety-related station batteries may be inoperable for a period not exceeding 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> provided four battery .

1 chargers remain operable with one charger carrying the DC loads of j.

each main DC distribution bus.  ;

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This two unit plant has four 345 KV transmission line interconnections. A 20 MW gas turbine generator and two 2850 KW diesel generators are installed at the l1 plant. All of these energy sources will be utilized to provide depth and 1 reliability of service to the Engineered Safeguards equipment through redundant l 4

station auxiliary power supply systems, j The electrical system equipment is arranged so that no single contingency can inactivate enough safeguards equipment to jeopardize the plant safety. The' l 480-volt equipment is arranged on 4 buses per unit. The 4160-volt equipment  ;

is supplied from 6 buses per unit. 3 I

Unit 1 - Amendment No. 15.3.7-4 1

Unit 2 - Amendment No.  !

Two separate outside sources can serve either unit's low voltage station  ;

auxiliary transformer. One is a direct feed from the unit's high voltage station auxiliary transformer and the second is from the other unit's high voltage station auxiliary transformer or the gas turbine via the 13,800 volt I system tie bus H01. ,

i Separation is maintained in the 4160-volt system to allow the plant auxiliary ,

equipment to be arranged electrically so that redundant items receive their power from the two different buses. For example, the safety injection pumps i are supplied from the 4160 volt buses 1-A05 and 1-A06 for Unit No. I and 2-A05

• and 2-A06 for Unit No. 2; the six service water pumps are arranged on 480-volt buses as follows: two on bus 1-B03, one on bus 1-B04, one on bus 2-B03 and two on bus 2-804; the four containment fans are divided between 480-volt buses 1-B03 .

and 1-B04 for Unit No. I and 2-B03 and 2-B04 for Unit No. 2 and so forth.

Redundant valves are supplied from motor control centers 1-B32 and 1-842 for Unit No. I and 2-B32 and 2-B42 for Unit No. 2.

The specifications for the 480 volt safeguards buses, B03 and B04, and the  :

4160 volt safeguards buses, A05 and A06, direct an independent lineup of power distribution, specifically stating that a normal lineup must be achieved (all  ;

safeguards buses associated with a unit are powered through their normal supply breaker with all safeguards bus tie-breakers open) prior to taking a unit  !

critical and during subsequent power operation. Operability of the safeguards buses is based on maintaining at least one on-site AC power source and associated

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distribution system operable during accident conditions coincident with an [

i assumed loss of offsite power and a single failure in the other on-site AC source.

This includes a failure of a tie-breaker to trip, which under certain conditions could result in an overload and a loss of the associated diesel generator. The l LCOs permit abnormal power distribution lineups for periods of time in order to ,

facilitate such items as maintenance of normal supply breakers or transformers. I In such cases, bus independence may be relaxed under the conditions specified in the LCO.

l Extended use of safeguards bus tie-breakers is allowed under specified, controlled conditions. For example, when a unit is fully defueled, safeguards and safe ,

shutdown systems and equipment dedicated to that unit are not required. However, spent fuel pool cooling must be maintained. By limiting the loads supplied by the j cross-connected buses, the potential for loss of a diesel generator due to overloading caused by the failure of a tie-breaker to open is minimized.

Unit 1 - Amendment No. 15.3.7-5 Unit 2 - Amendment No. l I

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Operability of shared safeguards systems such as auxiliary feedwater and service water must be maintained as required by their applicable LCOs.

The Point Beach DC electrical system has been modified so that each of the four main DC distribution buses, which are shared between the two units, has its own power supplies consisting of a safety-related station battery { DOS, D06, DIOS, D105) and a battery charger. In addition to these bus-specific power supplies,  !

a swing safety-related battery (D305) is installed which is capable of being connected to any one of the four main DC distribution buses. Swing battery chargers are also provided. Under normal circumstances, one battery and one battery charger are connected in each main DC distribution bus. The battery  ;

charger normally shall be in service on each battery so that the batteries will always be at full charge in anticipation of a loss-of-AC power incident. Under  ;

unusual circumstances, two of the five safety-related batteries may be out of service for a limited period of time provided one of the two out-of-service batteries is returned to service within the time periods specified in Specification 15.3.7.B.1.f ;i. These limiting conditions for operation ensure that adequate DC power will always be available for starting the emergency generators i and other emergency uses.

The emergency generatoe-sets-arc Cencrcl Mators-C+eporat4cn, Electee-Hot 4ve Div4+4enr44odel-999-20-Un4t+-rated-at4850-KW-cont 4nuous, 0.8 powee-fac4+e-900 RPMr-4160-volt +-i-pha;e, 50 cyc4e-and-censume405-gaMons-of-fuel - pcr hcuer-Thus  ;

the-lh000-gaHon-supply-4n-the4mergency Fuel Tank-prov4 des-suff4eient fuel te operate-ene-diesel--at-des 49n-lead-for more than- 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br />. In add 414ent-41-wi44 be-normal-for-Fe4nt-Beach-t+-keep one, er the-equivalent of One, bulk-st+ rage tank-fuM-at--eH-t4mes-(W,000-9aMons-which is equal-to-about--10-days'--eupply}r-They-a re-each-capa ble-o f-prev 4 ding 4050-kw4+r-a40-minu t e-per4 cd . The gas turb4ne i; capable-of--prov4d4ng- 20,000-kwr

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If only one 345 KV transmission line is in service to the plant switchyard,  !;

a temporary loss of this line would result in a reactor trip (s) if the reactor (s) i power level were greater than 50%. Therefore, in order to maintain continuity [

of service and the possibility of self sustaining operations, if only one 345 KV  ;

transmission line is in service to any operating reactor (s), the power level of j the affected reactor (s) will be limited to 50%.

Unit 1 - Amendment No. 15.3.7-7 Unit 2 - Amendment No.

If both 345/13.8 KV station auxiliary transformers are out of service, only one reactor will be operated. The gas turbine will be supplying power to operate safeguards auxiliaries of the operating reactor and acts as a backup supply for i the unit's normal auxiliaries. Therefore, to prevent overloading the gas turbine in the event of a reactor trip, the maximum power level for the operating reactor will be limited to 50%. These conservative limits are set to improve transmission system reliability only and are not dictated by safety system requirements. ,

Egferences FSAR Section 8. ,

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Unit 1 - Amendment No. 15.3.7-8 Unit 2 - Amendment No. i

9

3. Each diesel generatcr shall be given an i;<spection, at least annually,*

following the manufacturer's recommendations for this class of i stand-by service.

4. Each fuel cil transfer pump shall be run montMyr D[eHliH]fy3[]fji N5531$!EENildN55ENN3EM$N!N1[Ed5NI$NE$ I sc B 1sialifaan ggsseg g ggfa yal p arg!giIg E gissD aiti MOJiGEMMEEEfEMQiBHEfueBJEfDM?IEBiiEilfsl 65MMISiE1351E!ffiguigygiHWigigGiEsFillggilSIM .

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The above tests will be considered satisfactory if all applicable equipment operates as designed.  ;

B. Safety-Related Station Batteries These surveillance specifications are applicable to all four safety-related ,

station batteries: 005, D06, D105, and D106; and the safety-related station swing battery D305.

1. Every month the voltage of each cell (to the nearest 0.05 volt), the specific gravity and temperature of a pilot cell in each battery and

• each battery voltage shall be measured and recorded.

2. Every 3 months the specific gravity, the height of electrolyte, and ,

the amount of water added, for hach cell, and the temperature of every fifth cell, shall be measured and recorded. .

3. At each time data is recorded, new data shall be compared with old to  !

detect signs of abuse or deterioration.

4. Each Safety-Related Station Battery shall be demonstrated OPERABLE:

a. At least once per 18 months (SERVICE TEST) by verifying that the battery capacity is adequate to supply and maintain in OPERABLE status all of the actual or simulated emergency loads f for the design duty cycle.** '

• The surveillance interval for the 1992 annual inspection of diesel generator G02 may be extended up to 6 months, not to exceed a total time between annual inspections of 18 months. .

Service and Performance testing to begin subsequent to installation of the swing safety-related battery (D-305) which is expected by the end of 1992.

Unit 1 - Amendment No.136 15.4.6-2 November 23, 1992 Unit 2 - Amendment No. 140