ML20138A231

Proposed Tech Specs,Providing New Pp B 3/4 8-2a to Accomodate Overflow of Text from TS Bases Pp B 3/4 8-2

ML20138A231
Person / Time
Site:	Limerick
Issue date:	04/21/1997
From:	PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:
Shared Package
ML20138A192	List: ML20138A188 ML20138A231
References
NUDOCS 9704280020
Download: ML20138A231 (4)

Text

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ELECTRICAL POWER SYSTEMS

] BASES A.C'. SOURCES. D.C. SOURCES. and ONSITE POWER DISTRIBUTION SYSTEMS (Continued)

" Periodic Testing of Diesel Generator Units Used as Onsite Electric Power  !

Systems at Nuclear Power' Plants," Revision 1, August 1977 except for . .

paragraphs C.2.a(3),'C.2.c(1), C.2.c(2), C.2.d(3) and C.2.d(4), and the periodic  !

j testing will be performed at least once per 24 months. The exceptions to Regulatory. '

[ Guide 1.108 allow for gradual loading of diesel generators during testing and decreased  ;

a surveillance test frequencies (in response to Generic Letter 84-15). The single-  !

largest post-accident load.on each diesel generator is the RHR pump.

The Surveillance Requirement for removal of accumulated water from the fuel oil 2

storage tanks is for preventive maintenance. The presence of water does not necessarily represent failure of the Surveillance Requirement, provided the .

i accumulated water is removed during performance of the Surveillance..  !

j- Accumulated water in the fuel oil storage tanks constitutes a collection of. water

~

at a 1evel that can be consistently and reliably measured. The minimum level at i l which accumulated water can be consistently and reliably measured in the fuel i

oil storage tank sump is 0.25 inches. Microbiological fouling is a major cause of '

i fuel oil degradation. -There are numerous bacteria that can grow in fuel oil and cause fouling, but all must have a water environment in order to survive.

j i Removal of accumulated water from the fuel storage tanks once every (31). days  !

i eliminates the necessary environment for bacterial survival. This is the most i effective means of controlling microbiological' fouling. In addition, it eliminates i

the potential for water entrainment in the fuel oil during DG operation. Water may i

come from any of 'several sources, including condensation, ground water, rain

.. water,' contaminated- fuel oil, and from breakdown of the fuel oil by bacteria.

i

. Frequent. checking for and removal of accumulated water minimizes fouling and 1

provides data regarding the' watertight integrity of the fuel oil system. The l'

1 Surveillance Frequencies are established by Regulatory Guide 1.137.

! The surveillance requirements for demonstrating the OPERABILITY of the l units batteries are in accordance with the recommendations of Regulatory Guide 1.129 " Maintenance Testing and Replacement of Large Lead Storage Batteries for Nuclear Power Plants," February 1978 and IEEE Std 450-1980, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage

Batteries for-Generating Stations and Substations," except that certain tests will be

performed at least once every 24 months.

l Verifying average electrolyte temperature above the minimum for which the l

battery was sized, total battery terminal voltage on float charge, connection I i resistance values and the-performance of battery service and discharge tests

e. ensures the. effectiveness of the charging system, the ability to handle high i discharge rates and compares the battery capacity at that~ time with the rated

, capacity.

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i i

1 3

LIMERICK - UNIT 1 B 3/4 8-2  ;

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i. 9704200020 970421 P i PDR ADOCK 05000352 i i P PDRg

ELECTRICAL POWER SYSTEMS BASES ,

1 A.C. SOURCES. D.C. SOURCES. and ONSITE POWER DISTRIBUTION SYSTEMS (Continued) i Table 4.8.2.1-1 specifies the normal limits for each designated pilot cell and each connected cell for electrolyte level, float voltage and specific gravity. The limits for the designated pilot cells float voltage and specific gravity, greater than 2.13 volts and 0.015 below the manufacturer's full charge i specific gravity or a battery charger current that had stabilized at a low value, is characteristic of a charged cell with adequate capacity. The normal I limits for each connected cell for float voltage and specific gravity, greater '

then 2.13 volts and not more than 0.020 below the manufacturer's full charge specific gravity with an average specific gravity of all the connected cells not more than 0.010 below the manufacturer's full charge specific gravity, l ensures the OPERABILITY and capability of the battery. l l Operation with a battery cell's parameter outside the normal limit but

within the allowable value specified in Table 4.8.2.1-1 is permitted for up to j 7 days. During this 7-day period: (1) the allowable value for electrolyte level ensures no physical damage to the plates with an adequate electron transfer capability; (2) the allowable value for the average specific gravity of all the cells, not more than 0.020 below the manufacturer's recommended full charge specific gravity ensures that the decrease in rating will be less than the safety margin provided in sizing; (3) the allowable value for an individual cell's specific gravity, ensures that an individual cell's specific gravity  ;

will not be more than 0.040 below the manufacturer's full charge specific gravity and that the overall capability of the battery will be maintained within an acceptable limit; and (4) the allowable value for an individual cell's float voltage, greater than 2.07 volts, ensures the battery's capa-bility to perform its design function.

LIMERICK - UNIT 1 B 3/4 8-2a l

_ . ~ . _ . _ _ _ . _ _ . _ . _ . . . _ _ _ _ _ . . _ . _ _ _ . . . _ . _ _ _ . _ _ _

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4 2  ;

b ELECTRICAL POWER = SYSTEMS l

-BASES

-A.C. SOURCES. D.C. SOURCES. and ONSITE POWER DISTRIBUTION SYSTEMS (Continued)

Supplies, March 10,'1971, Regulatory Guide 1.137 " Fuel-011 Systems for Standby Diesel Generators," Revision 1, October _1979 and Regulatory Guide 1.108, " Periodic

Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear

[ Power Plants," Revision 1, August 1977 except for paragraphs C.2.a(3), C.2.c(1),

4 C.2.c(2), C.2.d(3) and C.2.d(4), and the periodic testing will be performed at least once per 24 months. The exceptions to Regulatory Guide 1.108 allow for gradual loading .

j of diesel generators during testing and decreased surveillance test frequencies _ (in l L response to Generic Letter 84-15). The single largest post-accident. load on each a

- diesel generator is the RHR pump.

The Surveillance Requirement for removal'of accumulated water from the fuel oil storage tanks is for preventive maintenance. The presence of water does'not  !

necessarily represent failure of the _ Surveillance Requirement, provided the accumulated water is removed during performance of the_ Surveillance.

I Accumulated water in the fuel oil storage tanks constitutes a collection of water.

! at a level that can be consistently and reliably measured. The minimum level-at which accumulated water-can be consistently and reliably measured in the fuel-4 oil storage tank sump:is 0.25 inches. . Microbiological fouling is a. major cause of

{ fuel oil-degradation. There are numerous bacteria that can grow in fuel oil and_ 1 cause. fouling, but all must have a water environment in order to survive. )

2 Removal of accumulated water from the fuel storage tanks once every (31). days l 1

eliminates the necessary environment for bacterial survival. Thistis.the most j -effective means of controlling microbiological fouling. In addition,_it eliminates

the potential for water entrainment' in the fuel oil _-during DG operation. Water may come.from any of several sources, including condensation, ground water, rain i water, contaminated fuel oil, and from breakdown of the fuel oil by bacteria.

Frequent checking for and removal of accumulated water minimizes fouling and a -provides data regarding the watertight integrity of the fuel oil system. The l- Surveillance Frequencies are established by Regulatory Guide 1.137.

I The surveillance requirements for demonstrating the OPERABILITY of the

units batteries.are in accordance with the recommendations of Regulatory Guide 4 -1.129 " Maintenance Testing and Replacement of Large Lead Storage Batteries for

Nuclear Power Plants," February 1978 and IEEE Std 450-1980, "IEEE Recommended

. Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries.for Generating Stations and Substations," except that certain tests will be l performed at least'once every 24 months.

Verifying average electrolyte temperature above the minimum for which the battery was sized, total battery terminal voltage on float-charge, connection

-resistance values and the performance of battery service and discharge tests ensures the effectiveness of the charging system, the ability to handle high

' discharge rates and compares the battery capacity at that time with the rated capacity.

LIMERICK - UNIT 2 B 3/4 8-2

- .o i i

1

, ELECTRICAL POWER SYSTEMS BASES A.C. SOURCES. D.C. SOURCES. and ONSITE POWER DISTRIBUTION SYSTEMS (Continued) l Table 4.8.2.1-1 specifies the normal limits for each designated pilot cell and each connected cell for electrolyte level, float voltage and specific j

' gravity. The limits for the designated pilot cells float voltage and specific gravity, greater than 2.13 volts and 0.015 below the manufacturer's full charge specific gravity or a battery charger current that had stabilized at a low value, is characteristic of a charged cell with adequate capacity. The normal limits for each connected cell for float voltage and specific gravity, greater j than 2.13 volts and not more than 0.020 below the manufacturer's full charge l specific gravity with an average specific gravity of all the connected cells '

not more than 0.010 below the manufacturer's full charge specific gravity, ensures the OPERABILITY and capability of the battery.

Operation with a battery cell's parameter outside the normal limit but within the allowable value specified in Table 4.8.2.1-1 is permitted for up to 7 days. During this 7-day period: (1) the allowable value for electrolyte level ensures no physical damage to the plates with an adequate electron transfer capability; (2) the allowable value for the average specific gravity 1 of all the cells, not more than 0.020 below the manufacturer's recommended full  ;

charge specific gravity ensures that the decrease in rating will be less than '

the safety margin provided in sizing; (3) the allowable value for an individual cell's specific gravity, ensures that an individual cell's specific gravity will not be more than 0.040 below the manufacturer's full charge specific gravity and that the overall capability of the battery will be maintained within an acceptable limit; and (4) the allowable value for an individual cell's float voltage, greater than 2.07 volts, ensures the battery's capa-bility to perform its design function.

LIMERICK - UNIT 2 B 3/4 8-2a l