ML20080B547

Proposed Tech Specs Re EDG Testing Requirements

ML20080B547
Person / Time
Site:	Prairie Island
Issue date:	11/30/1994
From:	NORTHERN STATES POWER CO.
To:
Shared Package
ML20080B542	List: ML20080B540 ML20080B544 ML20080B547
References
NUDOCS 9412050293
Download: ML20080B547 (11)

Text

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Exhibit B, Rev 1 l

l Prairie Island Nuclear Generating Plant ,

l Supplement to License Amendment Request Dated October 3, 1994  !

l Proposed Changes Marked-up on i i

Existing Technical Specification Pages Exhibit B consists of existing Technical Specifications pages with the proposed changes highlighted on those pages; the backgrounded text represents i the proposed additions and the lined-out text represents the proposed '

deletions. The existing pages affected by this License Amendment Request are listed below:

Panes  ;

TS.4.6-1  ;

TS.4.6-2 B.4.6-1 B.4.6-2 i l

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9412050293 DR 94113o ADDCK 05000292 PDR

4 TS.4.6-1 i

4.6 PERIODIC TESTING OF EMERGENCY POWER SYSTEM I Applicability Applies to periodic testing and surveillance requirements of the emergency power system.

Obiective I To verify that the emergency power sources and equipment are OPERABLE.

Specification The following tests and surveillance shall be performed:

i A. Diesel Generators

1. At least once each month, for each diesel generator:

a. Verify the fuel level in the day tank.

b. Verify the fuel level in the fuel storage tank. {

c. Verify that a sample of diesel fuel from the fuel storage tank is l l

within the acceptable limits specified in Table 1 of ASTM D975-77 when

! checked for viscosity, water, and sediment. '

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d. Verify the fuel transfer px can be started and transfers fuel from the storage system to t)* ' ry tank.

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e. Verify the diesel generator can start at.e >- ,aally accelerate-te l cynchrencue epccd g yerifylthy with-generar voltage and frequency dan i lis[adjdsthdJto*et-4160 i 420 volts and 60 x 1.2 Hz. Subsequently, j manually synchronize the generator, gradually load to at least 1650 kW *

(Unit 2: 5100 kW to 5300 KW), and operate for at least 60 mioutes.

This test should be conducted in bonsiderat{od[6fil4eeerdence uitte-the manufacturer's recommendations regarding engine prelube, warm-up, l loading and shutdown procedures where possible.

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i TS.4.6-2 4.6.Ai2. At least once each 6 months, for each diesel generator:  ;

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a. Verify the diesel generator starts and[ishijfus accelernter te et Icent cynchreneur speed ir Icc: th n er : quel te 10 creende.

b. Verify the generator voltage and frequency :: he 'pf}4160 i 420 volts and 60 1.2 Hz within 10 seconds after the start signal.

be. Manually synchronize the generator, load to at least 1650 kW (Unit 2: 5100 kW to 5300 kW) in less than or equal to 60 seconds and operate for at least one hour.

$4. This test should be conducted froaQstsijdby3odditiysslin $6hsMe:rftidn sfjaesordance eith the manufacturer's recommendations regarding engine prelube and shutdown procedures where possible.

3. At least once each 18 months:

a. Subject each diesel generator to a thorough inspection in accordance with procedures prepared in EbnsidhyaWips[6f]cenjunceler 214h the manufacturer's recommendations for this class of standby service.

b. For each unit, simulate a loss of offsite power in conjunction l with a safety injection signal, and:

1. Verify de-energization of the emergency buses and load shedding from the emergency buses, j

2. Verify the diesels start on the auto-start signal and energize ,

the emergency buses in one minute. This test should be l conducted in hydsideystio{of[ccc:rd nce zith the manufacturer's -

recommendations regarding engine prelube and shutdown procedures where possible.

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3. Verify th:t th: cute-ecrnected Iced: de net eneced 3000 '"  ;

(Unit 2: 5100 '").  !

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Verify that the dic 21 generater cycten tripe, ene.7t there fer l ngin ever:pred, grcund fault, 2nd gener ter differect444-.

current (Vnit 2: except there fer : gine everspeed and generater differential current), crc autenatically hyper ct.-

3% [Dd'rin5Cthis{tisat@psratibQf{thelsmerisn6f]ightisfaystWshall befa_scertainedi

c. For each disselThedsist5f=44, demonstrate full-load carrying capability for an interval of not less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, of which at least32 hours are at a load equal to 105-}03]to 110 percent of EEe conti5uous rating of the emergency diesel generatorE(17ey/s2832[to 30001kv._f[U6.1E2~ P. ,2.55622 tM, 59401kW]T., and 22th. 'sirss_

-- . . - air.ider is..t_siithe124 hours are at a load pfigreaterJthan7o.Gequal to 90 - '^^ percent of its continucus ratingV(igj2475]kV][U61ii23HM860]). Verify the generator voltage and frequency to be 4160 1 420 volts and 60 1.2 Hz . M Mossatiff? tri6sisnts f dut s;ideiths f loadf rungsid6TnotCiuvs11da te l y.his.~? te. .s. t!..

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TS.4.6 2 (continued) l

d. Verify the capability of each generator to reject a load of at least 650 kW (Unit 2: 860 kW) without. tripping. .

c. During thi: ::::, :;::: ler rf *h  ::::; ncy lightin; cy ::: ch:11 he 22:2rtnined.

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I e r, , For~each"'

u niti' simulatea' safety 1njection'signaFand verify chat (the ,

diesel generator system trips, except those for, engine overspeed; l ground fault, and generator differential current (Unit 2: (except those for engine.overspeed'a'nd generator differential current), are l automatically bypassed.,

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B.6.6-1 .,

4.6 PERIODIC TESTING OF EMERGENCY POWER SYSTEMS Bases The monthly tests specified for the diesel generators will demonstrate their continued capability to start ~and to carry load. The fuel supplies and-starting circuits and controls are continuously monitored, and abnormal conditions in these systems would be alarm-indicated with- out need for test startup.

The less frequent overall system test will demonstrate that the emergency power system and the control systems for the engineered safeguards equipment will function automatically in the event of loss of all other sources of a-c power, and that the diesel generators will start auto- matically in the event of a loss-of-coolant accident. This test will demonstrate proper tripping of motor feeder breakers, main supply and tie breakers on _ the affected bus, and sequential starting of essential equipment, as well as the OPERABILITY of the diesel generators. The load rejection test will demonstrate the capability to reject the single largest emergency load without tripping.

The specified test frequencies provide reasonable assurance that any mechanical or electrical deficiency will be detected and corrected before it can result in failure of one emergency power supply to respond when called upon to function.

It's possible failure to respond is, of course, anticipated by providing two diesel generators per unit, each supplying, through an independent bus, a complete and adequate set of engineered safeguards equipment. Further, both diesel generators are provided as backup to multiplo sources of external power, and this multiplicity of sources should be considered with regard to adequacy of test frequency.

Each diesel generator can start and be ready to accept full load within 10 seconds, and will sequentially start and supply the power .

requirements for one complete set of safeguards equipment in approximately  !

one minute (Reference 1).

An internal fault in the generator could damage the generator severely.  ;

Moreover, this change complies with BTP EICSB 17. Auto-connected loads  ;

should not exceed the overload rating of the diesel generator for the 2000 l hour maintenance interval, as prescribed in Regulatory Guide 1.9. j l

The diese1~1oad' t'est'value's'mean' those'~ values"~as measured'by 'Che~ test instrumentation; For example, the load ' carrying capability te'st' l l

requirement that the diesel generator be run for a period of time 'at na load of greater than or equal to 247p kW'means that the in'strumentation must be measuring a load of at least'2475 kWe, It is'not necessary to assume an instrument error 'such ,that the test, would be performed 'at an indicated load of 2475 kW + 60 kW (choosing a potential instrumsnt error in a particular direction). .The operating' ranges for these tests were included in the Technical Specifi, cation, to account forjinstrument; I

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inahyGrahiiQlusZthelusila196sdispingskhang6nne c epdipo3thQpids Station batteries will deteriorate with time, but precipitous failare is extremely unlikely. The surveillance specified is that which has been demonstrated over the years to provide indication of a cell l becoming unserviceable long before it fails.

I If a battery cell has deteriorated, or if a connection is loose, the voltage under load will drop excessively, indicating need for replace-ment or maintenance.

4.6 PERIODIC TESTING OF EMERGENCY POWER SYSTEMS Bases continued The surveillance specified for the pressurizer heater power source provides assurance that Backup Heater Group "B" can be transferred to its emergency bus. Normally, this group of heaters is supplied from a normal plant 480 volt bus. In an emergency, a manual transfer switch can be used to supply the heater group from a safeguards supply bus.

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Reference

1. USAR, Section 8.4 1

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l Exhibit C, Rev 1 Prairie Island Nuclear Generating Plant

! Supplement to License Amendment Request Dated October 3, 1994 I Revised Technical Specifications Pages Exhibit C consists of revised pages for the Prairie Island Nuclear Generating I Plant Technical Specifications with the proposed changes incorporated. The revised pages are listed below: i Pares TS.4.6-1  ;

TS.4.6-2

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B.4.6-1 i B.4.6-2 l

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TS.4.6-1 l \

l 4.6 PERIODIC TESTING OF EMERGENCY POWER SYSTEM Applicability Applies to periodic testing and surveillance requirements of the emergency 1

power system.

Obiective To verify that the emergency power sources and equipment are OPERABLE.

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Specification The following tests and surveillance shall be performed: j A. Diesel Generators ,

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1. At least once each month, for each diesel generator: j

a. Verify the fuel level in the day tank.  !

b. Verify the fuel level in the fuel storage tank.

c. Verify that a sample of diesel fuel from the fuel storage tank is within the acceptable limits specified in Table 1 of ASTM D975-77 when i checked for viscosity, water, and sediment.  ;

I d. Verify the fuel transfer pump can be started and transfers fuel from the storage system to the day tank. l 1

j e. Verify the diesel generator can start and gradually accelerate. Verify i the generator voltage and frequency can be adjusted to 4160 420 folts l and 60 1.2 Hz. Subsequently, manually synchronize the generator,

! gradually load to at least 1650 kW (Unit 2: 5100 kW to 5300 KW), and l operate for at least 60 minutes. This test should be conducted in ,

j consideration of the manufacturer's recommendations regarding engine lI prelube, warm-up, loading and shutdown procedures where possible.

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.~ TS.4.6-2 4.6.A.2. At least once each 6 months, for each diesel generator:

a. Verify the diesel generator starts and achieves generator voltage and frequency of 4160 420 volts and 60 1.2 Hz within 10 seconds after the start signal. j

b. Manually synchronize the generator, load to at least 1650 kW (Unit l ,

2: 5100 kW to 5300 kW) in less than or equal to 60 seconds and operate for at least one hour.  !

j c. This test should be conducted from standby conditions in consideration of the manufacturer's recommendations regarding engine prelube and shutdown procedures where possible.

3. At least once each 18 months:

l l a. Subject each diesel generator to a thorough inspection in accordance with procedures prepared in consideration of the manufacturer's recommendations for this class of standby service,

b. For each unit, simulate a loss of offsite power in conjunction with a safety injection signal, and:

1. Verify de-energization of the emergency buses and load shedding ,

from the emergency buses. l t

' (' 2. Verify the diesels start on the auto-start ignal and energize the emergency buses in one minute. This teot should be l conducted in consideration of the manufacturer's recommendations  !

l- regarding engine prelube and shutdown procedures where possible.

3. During this test, operation of the emergency lighting system shall be ascertained. '

c. For each diesel generator, demonstrate full-load carrying capability  ;

for an interval of not less than 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, of which at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> are at a load equal to 103 to 110 percent of the continuous rating of the emergency diesel generator (i.e., 2832 to 3000kW (Unit 2: 5562 to 5940 kW)), and the remainder of the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> are at a load of greater than or equal to 90 percent of its continuous rating (i.e., 2475 kW

[ Unit 2: 4860 kW]). Verify the generator voltage and frequency to be 4160 420 volts and 60 1.2 Hz. Momentary transients outside the load ranges do not invalidate this test.

d. Verify the capability of each generator to reject a load of at least 650 kW (Unit 2: 860 kW) without tripping.

e. For each unit, simulate a safety injection signal and verify that the diesel generator system trips, except those for engine overspeed, ground fault, and generator differential current (Unit 2: except those for engine overspeed and generator differential current), are automatically bypassed.

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B.4.6-1 4.6 PERIODIC TESTING OF EMERGENCY POWER SYSTFMS Bases  !

l The monthly tests specified for the diesel generators will demonstrate their j continued capability to start and to carry load. The fuel supplies and i starting circuits and controls are continuously monitored, and abnormal )

conditions in these systems would be alarm-indicated with- out need for test i startup.

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! I The less frequent overall system test will demonstrate that the emergency power system and the control systems for the engineered safeguards equipment will function automatically in the event of loss of all other sources of a-c power, and that the diesel generators will start auto- matically in the event of a loss-of-coolant accident. This test will demonstrate proper tripping of motor feeder breakers, main supply and tie breakers on the affected bus, and i sequential starting of essential equipment, as well as the OPERABILITY of the j l diesel generators. The load rejection test will demonstrate the capability to i reject the single largest emergency load without tripping. l The specified test frequencies provide reasonable assurance that any mechanical or electrical deficiency will be detected and corrected before it i can result in failure of one emergency power supply to respond when called l upon to function. It's possible failure to respond is, of course, anticipated 1

! by providing two diesel generators per unit, each supplying, through an independent bus, a complete and adequate set of engineered safeguards equipment. Further, both diesel generators are provided as backup to multiple i sources of external power, and this multiplicity of sources should be considered with regard to adequacy of test frequency.

Each diesel generator can start and be ready to accept full load within 10 seconds, and will sequentially start and supply the power

requirements for one complete set of safeguards equipment in approximately one minute (Reference 1).

An internal fault in the generator could damage the generator severely.

l Moreover, this change complies with BTP EICSB 17. Auto-connected loads

! should not exceed the overload rating of the diesel generator for the 2000 hour0.0231 days <br />0.556 hours <br />0.00331 weeks <br />7.61e-4 months <br /> maintenance interval, as prescribed in Regulatory Guide 1.9.

The diesel load test values mean those values as measured by the test instrumentation, For example, the load carrying capability test requirement that the diesel generator be run for a period of time at a load of greater than or equal to 2475 kW means that the instrumentation must be measuring a load of at least 2475 kW., It is not necessary to assume an instrument error such that the test would be performed at an indicated load of 2475 kW + 60 kW (choosing a potential instrument error in a particular direction). The operating ranges for these tests were included in the Technical Specifications to account for instrument t

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4 B.4.6-2 l inaccuracies plus the usual load swings when connected to the grid. l Station batteries will deteriorate with time, but precipitous failure l is extremely unlikely. The surveillance specified is that which has  !

been demonstrated over the years to provide indication of a cell l becoming unserviceable long before it fails.

l If a battery cell has deteriorated, or if a connectiait is loose, the  !

voltage under load will drop excessively, indicating need for replace- i ment or maintenance. l 4.6 PERIODIC TESTING OF EMERGENCY POWER SYSTEMS Bases continued The surveillance specified for the pressurizer heater power source  ;

provides assurance that Backup Heater Group "B" can be transferred to ,

its emergency bus. Normally, this group of heaters is supplied from l a normal plant 480 volt bus. In an emergency., a manual transfer switch l can be used to supply the heater group from a safeguards supply bus.

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Reference

1. USAR, Section 8.4