ML20137P264
| ML20137P264 | |
| Person / Time | |
|---|---|
| Site: | Waterford  |
| Issue date: | 04/07/1997 |
| From: | ENTERGY OPERATIONS, INC. |
| To: | |
| Shared Package | |
| ML20137P260 | List: |
| References | |
| NUDOCS 9704090200 | |
| Download: ML20137P264 (8) | |
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W3F1-97-0067 ATTACHMENT 9704090200 970407 PDR ADOCK 05000382 P PDR
- 4. El ECTRICAL POWER SYSTEM SURVEILLANCE REQUIREMENTS j "4.8'1.1.1 Each of the above required independent circuits between the offsite transmission network and the onsite Class 1E distribution system shall be:
- a. Determined OPERABLE at least once per 7 days by verifying correct breaker [
alignments, indicated power availability, and :
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- b. Demonstrated OPERABLE at least once per 18 months by transferring manually'and automatically unit power supply from the normal circuit to the attemate circuit.
l 4.8.1.1.2 Each diesel generator shall be demonstrated OPERABLE *:
- a. At least once per 31 days {
on a STAGGERED TEST BASIS by: .
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- 1. Verifying the fuel level in the diesel oil feed tank, t
- 2. Verifying the fuel level in the diesel generator fuel oil storage tank,
- 3. Verifying the fuel transfer pump can be started and transfers fuel from ,
the storage sys'.em to the diesel oil feed tank, !
- 4. Verifying the diesel starts.** 1he generator voltage and frequency shall be at l least 3920 volts and 58.8 Hz in <510 seconds after the start signal. The steady
, l state voltage and frequency shall be maintained at 4160 + 420,-240 volts and 60 t i 1.2 Hz. The :liesel generator shall be started for this test by using one of the following signais: ;
a) Manual. ,
i i b) Simulated loss-of-offsite power by itself. !
. a c) Simulated loss-of-offsite power in conjunction with an ESF actuation test signal.
d) An ESF actuation test signal by itself. !
l l 'All planned starts for the purpose of surveillance in this section may be preceded by a prelube period as ' >
recommended by the manufacturer, j
! "A modified diesel generator start involving idling and gradual acceleration to synchronous speed may be used for this surveillance requirement as recommended by the manufacturer. When modified start i procedures are not used, the time, speed, voltage, and frequency tolerances of this surveillance requirement must be met.
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WATERFORD - UNIT 3 3/4 6-3 AMENDMENT NO. 33, 74 I
ELECTRICAL POWER SYSTEMS )
,, SURVEILLANCE REQUIREMENTS (Continued) ,
5.- ~ Verifying the generator is synchronized, - .
' loaded to an indicated 4000-4400 Kw'in accordance with the manufacturers !
. recommendation and operates for at least an additional 60 minutes', and l 1
' 6. Verifying the diesel generator is aligned to provide standby ;
power to the associated emergency busses. ;
- b. . At least once per 31 days and after each operation of the diesel where . ;
the period of operation was greater than or equal to 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> by checking for and removing j accumulated water from the diesel oil feed tanks. r
- c. At least once per 92 days and from new fuel oil prior to addition to the storage tanks, by obtaining a sample of fuel oil in accordance with ASTM-D270-1975, and by verifying that ;
the sample meets the following minimum requirements and is tested within the. specified j' time limits:
- 1. As soon as sample is taken (or prior to adding new fuel to the storage tank) verify in accordance with the test specified in ASTM-D975-77 that the sample has:
a) A water and sediment content of less or equal to 0.05 volume percent, b) A kinematic viscosity @ 40'C of greater than or equal to 1.9 centistokes, but less :
than or equal to 4.1 centistokes.
c) A specific gravity as specified by the manufacturer @ 60/60*F of greater than or ;
equal to 0.85 but less than or equal to 0.99 or an API gravity @ 60'F of greater than or .
equal to 11 degrees but less than or equal to 35 degrees. i
- 2. Verify an impurity level of less than 2 mg of insolubles per 100 ml when tested in accordance with ASTM-D2274-70; knalysis shall be completed within 7 days after obtaining the sample but may be performed after the addition of new fuel oil; and
- This band is meant as guidance to avoid routine overloading of the engine. Loads in excess of this band
' for special testing under direct monitoring of the manufacturer or momentary variation due to changing bus loads shall not invalidate the test.
"This surveillance requirement shall be proceeded by and immediately follow without shutdown a successful performance of 4.8.1.1.2a.4 or 4.8.1.1.2d.
t WATERFORD - UNIT 3 3/4 8-4 AMENDMENT NO.-443,92
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1 ELECTRICAL POWER SYSTEMS j 7, SURVEILLANCE REQUIREMENTS (Continued) j- l 1
3s Verify the other properties specified in Table 1 of ASTM-D975-1977 and !
Regulatory Guide 1.137, Revision 1, October 1979 Position 2.a., when tested in - j i accordance with ASTM-0975-1977; analysis shall be completed within 14 days '
after obtaining the sample but may be performed after the addition of new fuel oil. Failure to meet this req::!rement shall not affect diesel generator y "
i OPERABILITY; however, corrective action shall be initiated within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> to retum the fuel oil supply to within acceptable limits. j l
- d .' At least once por 184 days a diesel generator fast start test shall be performed in - )
" ' accordance with TS 4.8.1.1.2a.4. Performance of the 184 day fast start test satisfies the 31 day testing requirements specified in TS 4.8.1.1.2a.4.
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- e. At least once per 18 months during shutdown _by: l le
'1. Verifying the generator capability to reject a load of greater than or. !'
4 equal to 498 kW while maintaining voltage at 4160 + 420,-240 volts and frequency at 60 +4.5,1.2 Hz. ,
! 2. Verifying the generator capability to reject a load of an indicated 4000-4400 kw ,
without tripping. The generator voltage shall not exceed 5023 volts during and i following the load rejection. ;
- 3. Simulating a loss-of-offsite power by itself, and: :
. a) . Verifying deenergization of the emergency busses and load ;
shedding from the emergency busses. ;
b) _ Verifying the diesel starts on the auto-start signal,' energizes the emergency busses and the permanently connected loads within 10 i- seconds after the auto-stait signal, energizes the auto-connected shutdown loads through the load sequencer and operates for greater than l or equal to 5 minutes while its Generator is loaded with the shutdown loads. After energization, the steady-state voltage and frequency of the l emergency busses shall be maintained at 4160 + 420,-240 volts and 60 + ,
.1.2, -0.3 H7 during this test. ;
- 4. Verifying that on an SIAS actuation test signal (without loss-of-offsite
- power) the diesel generator starts on the auto-start signal and operates on standby for greater than or equal to 5 minutes. The steady-state generator l
- voltage and frequency shall be 4160 + 420,-240 volts and 60 i 1.2 Hz within 10 -
seconds after the auto-start signal; the generator voltage and frequency shall be i maintained within these limits during this test.
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. ;WATERFORD J UNIT 3 - 3/4 8-5 AMENDMENT NO. 4,23,71,"", 98 ]
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ELECTRICAL POWER SYSTEl48 ;
i SURVEILLANCE REQUIREMENTS (Continued)
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.. . . I 8.' Verifying the diesel generator's capability to: ,
a) Synchronize with the offsite power source while the generator 6 is loaded with its emergency loads upon a simulated restoration d offsite . i power,'
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b) Transfer its loads to the offsite power source, and -
c) Be restored to its standby status, t r
- 9. . Verifying that wph the diesel generator operating in a test mode (connected to its bus), a simulated safety injection signal overrides the test
, mode by (1) retuming the diesel generator to standby operation and (2) - i automatically energizes the emergency loads with offsite power. l
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- 10. Verifying that each fuel transfer pump transfers fuel to its ,
associated diesel oil feed tank by taking suction from the opposite train fuel oil ,
storage tank via the installed cross connect.
- 11. Verifying that the automatic load sequence timer is OPERABLE with the time of each load block within i 10% of the sequenced load block time. ;
$ 12. Verifying that the following diesel generator lockout features prevent F diesel generator starting only when required; ,
a) ~ tuming gear engaged' f b) emergency stop c) loss of D.C. control power l i d) govemor fuel oillinkage tripped ;
. f. At the first refueling outage, and thereafter, at intervals not to exceed 24 l !
months, subject the diesels to an inspection in accordance with procedures prepared in r conjunction with its manufacturer's recommendations for this class of standby service.
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j- g. At least once per 10 years or after any modifications which could affect diesel l generator interdependence by starting the diesel generators simultaneously, during >
i shutdown, and verifying that the diesel generators accelerate to at least 600 rpm (60 i 1.2 Hz) in less than or equal to 10 seconds.
- h. At least once per 10 years by: l 5-
- 1. Draining each diesel generator fuel oil storage tank, removing the accumulated sediment, and cleaning the tank using a sodium hypochlorite
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solution or equivalent, or an appropriate mechanical method (such as pressure ,
- washing or manual wiping).
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- WATERFORD - UNIT 3 3/4 8-6a AMENDMENT NO. 23, 92 s
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. ELECTRICAL POWER SYSTEMS CURVEILLANCE REQUIREMENTS (Continued) ,
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! l. By performing a visualinspection of the interior of the diesel generator fuel l l oil stora0e tanks each time the tank is drained and, if necessary, clean the tank with a -!
sodium hypochlorite solution, or equivalent, or with an appropriate mechanical method (such as pressure washing or manual wiping).
4.8.1.1.3 Reports - (Not Used).
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WATERFORD - UNIT 3 3/4 8-6b AMENDMENT NO. 23 t
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ELECTRICAL POWER SYSTEMS j BASES. ,
A3. SOURCES. D.C. SOURCES. AND ONSITE POWER DISTRIBUTION SYSTEMS (Continued)
The Surveillance Requirements for demonstrating the OPERABILITY of the diesel generators are consistent with the recommendations of Regulatory Guides 1.9 " Selection of Diesel Generator Set Capacity for Standby Power Supplies," March 10,1971, and 1.108
- Periodic Testing of Diesel Generator Units Used as Onsite Electric Power Systems at Nuclear Power Plants," Revision 1, August 1977, and 1.137, " Fuel Oil Systems for Standby Diesel Generators " Revision 1, October 1979. Other provisions are derived from Generic Letter 93-05 "Line-!!em Technical Specifications improvements to Reduce Surveillance Requirements for Testing During Power Operation" 94-01 " Removal of Accelerated Testing and Special Reporting Requirements for Emergency Diesel Generators," and NUREG 1432 Standard Technical Specifications Combustion Engineering Plants The minimum voltage and frequerey stated in the Surveillance Requirement are those necessary to cnsure the d!esel generator can accept ine Design Basis Accident loading while maintaining a;ceptable voltage cnd frequency levels. Stable operation at the nominal voltage and frequency values is also essential to cstablishing diesel generator OPERABILITY, but a time constraint is not imposed. This is because a typical diesel generator will experience a period of voltage and frequency oscillations prior to reaching steady state operation if these oscillations are not dampened out by load application. This period may extend beyond the 10 second acceptance criteria and could be a cause for falling the Surveillance Requirement. In lieu of a time constraint in the Surveillance Requirement, the actual time to reach steady state operation is monitored and trended. This is to cnsure there is no voltage regulator or govemor degradation which could cause a diesel generator to become inoperable. The 10 seconds in the Surveillance Requirement is met when the diesel generator first reaches the specified voltage and frequency, at which time the output breaker would close if an automatic actuation had occurred.
The diesel generater Surveillance testing performed once per 18 months during shutdown is in cccordance with Regulatory Guide 1.108, Regulatory Position C.2.
The maximum vcitage limit in surveillance test 4.8.1.1.2.e.2 was increased to 5023 volts in response to l NRC Information Notice 91-13; inadequate Testing of Emergency Diesel Generators. A maximum voltage limit is provided to ensure that components electrically connected to the diesel generator are not damaged as a result cf the momentary voltage excursion experienced during this test.
The Surveillance Requirement for demonstrating the OPERABILITY of the station batteries are based on the recommendations of Regulatory Guide 1.129," Maintenance Testing and Replacement of Large Lead Storage Catteries for Nuclear Power Plants," February 1978, and IEEE Std 450-1980, "lEEE Recommended Practice for Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Generating Stations and Substations."
Verifying average electrolyte temperature above the minimum for which t1e battery was sized, total battery terminal voltage on float charge, connection resistance values and the performance of battery service cnd 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.
Table 4.8-2 specifies the normal limits for each designated pilot cell and each connected cell for clectrolyte level, float voltage, and specific gravity. The limits for the designated pilot cells float voltago and specific gravity, greater than 2.13 volts and 0.015 below the manufacturers full charge specific gravity or a battery charger cunent 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 than 2.13 volts cnd not more than 0.020 below the manufacturefs full charge specific gravity with an average specific gravity of cll the connected cells not more than 0.010 below the manufacturer's full charge specific gravity, ensures the OPERABILITY and capability of the battery.
WATERFORD - UNIT 3 8 3/4 8-2 AMENDMENT NO.,92
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.' ELECTRICAL POWER SYSTEMS BASES' _
A.C. SOURCES. D.C. SOURCES. AND ONSITE POWER DISTRIBUTION SYSTEMS (Continued) J l
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The Onsite Power System includes three 4.16 kV ESF buses (3A3-S, 3B3-S, and 3AB3-S).
I Power for safety related loads is normally supplied by the non-safety related 4.16 kV buses (3A2 and 382) of the Offsite Power System. Should offsite power from either of these buses be lost, the Onsite Power System will receive power automatically from the appropriate diesel generator. Non-safety related loads will be automatically disconnected from the safety Onsite Power System. Each ESF bus (3A3-S or 383-S) is redundant to the other; each can supply sufficient power to its safety related loads to enable safe shutdown, or to mitigate the consequences of a design basis accident. 1 The third bus,3AB3-S, may be connected to either 3A3-S or 3B3-S, but never to both. Therefore 3AB3-S is not considered as a third, separate source of ESF power. The three ESF buses and their 1
loads are tested as described below.
J Surveillance requirements 4.8.1.1.2.e.3 and 4.8.1.1.2.e.5 are the integrated testing l .
requirements that demonstrate the as designed operation of the standby A.C. power sources during '
loss of the offsite power source and during a loss of offsite power in conjunction with a Safety injection Actuation Signal (SIAS). l The testing verifies all actions encountered from the loss-of-offsite power (LOOP), including shedding of the nonessentialloads and the energizing of the emergency busses and respective loads ;
from the diesel generator. It further demonstrates the capability of the diesel generators to j automatically achieve the required voltage and frequency within the specified time.
l The requirement to verify the connection and energization of permanently connected loads i and auto-connected loads is intended to satisfactori!y show the relationship of these loads to the diesel generators loading logic. Permanently connected loads are those loads that remain connected to the bus upon the bus deenergizing and are subsequently energized by the diesel generators. Auto connected loads are those loads that are disconnected from the bus upon the bus deenergizing and !
are auto-connected through the automatic load sequencer. Surveillance 4.8.1.1.2.e.3b verifies the j diesel generators capability to energize the shutdown loads and surveillance 4.8.1.1.2.e.5b verifies !
I the diesel generators capability to energize the emergency loads. Shutdown loads are those loads required upon a LOOP (Re: FSAR Table 8.3.1). Emergency loads are those loads required upon a LOOP in conjunction with an SIAS. This testing verifies that in the event of a Design Bases Accident (DBA) coincident with a loss of offsite power, the diesel generators are capable of supplying the necessary power to Engineered Safety Features (ESF) systems so that the fuel, Reactor Coolant System (RCS), and containment design limits are not exceeded.
Surveillance requirement 4.8.1.1.2e.1 requires the verification at least once per 18 months ofl the diesel generators' ability to reject a load of greater than or equal to 498 Kw while specific voltage and frequency constraints are maintained. The intent of this Surveillance requirement is to require the diesel generator to reject the largest single load. The largest single load on the diesel generator is the Essential Chiller which requires 430 Kw under tomado/ missile conditions. The difference l between the specified 498 Kw load in the Surveillance requirement and the 430 Kw required by the l actual largest single load is a margin of conservatism. A method of rejecting a load greater than or i equal to 498 Kw utilizing the wet and dry cooling tower fans has been developed and will satisfy the Surveillance requirement.
WATERFORD - UNIT 3 B 3/4 8-2a ,
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