ML20141M078

Proposed Tech Specs Re Decoupling of Loss of Offsite Power/ Safety Injection Test from 24 H DG Surveillance Run

ML20141M078
Person / Time
Site:	Seabrook
Issue date:	03/20/1992
From:	PUBLIC SERVICE CO. OF NEW HAMPSHIRE
To:
Shared Package
ML20141M074	List: ML20141M073 ML20141M076 ML20141M078
References
NUDOCS 9203310294
Download: ML20141M078 (11)

Text

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UPERAl!NG vQ SURVEILLANCE REOUIREMENTS 4.8.1.1.2 (Continued) a)

Verifying deenerg sation of the emergency busses and load shedding from the emergency busses, and b)

Verifying the diesel starts on the loss of offsite power signal, energizes the amergency busses with permanently connected loads within 12 seconds, energizes the auto-connected shutdown loads through the emergency power sequencer and operates for greater than or equal to 5 minutes while its generator is loaded with the shutdown leads.

After energization, the steacy-state voltage and frequency of the emergency busses snall be maintained at 4160 : 420 volts and 60 2 1.2 H2 during thir test.

i 5)

Verifying that on an SI actuation test signal, witocut lass-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 generator voltage and frequency shall be 4160 i 420 volts and 60 1 1.2 H2 within 10 seconds after the auto start signal; the steady-state generator voltage and frequency shall be maintained within these limits during this test; 6)

Simulating a loss-of-offsite power in conjunction with an 51 actuation test signal; and a)

Verifying deenergi2ation of the emergency busses and load shedding from the emergency busses; N

b)

.VeHfyMg the diesel starts on the auto-start signal, energizes the ett<Jrgency busses with' permanently connected loads within 10 seconds, energizes the auto-connected emergency (accident) loads through the emergency power sequencer and operates for greater than or equal to 5 minutes while its generator is loaded with the emergency loads.

After anergization, the steady state voltage and frequency of the emergency busses shall be raintained at 41601420 volts and 60 1.2 Hz during this test; and c)

Verifying that all automatic diesel generator trips, except engine overspeed, low lube oil pressure, 4160-volt bus fault, and generator differential, are automatically bypassed upon loss of voltage on the emergency bus cc a ur-rent with a Safety Injection actuation signal.

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SEABROOK - UNIT 1 3/4 8 6 9203310294 920320 DR ADOCK 05000443 PDR

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W OPERATING SURVEILLANCE REQUIREMENTS 4.8.1.1.2 (Continued) 7)

Verifying the diesel generator operates for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

During the first 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of this test, the diesel generator shall be loaded to greater than or equal to 6697 kW and during the remaining 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> of this test, 'he diesel generator shall be loaded to greater than or equal te 6083 LW.

The generator voltage and frequency shall be 4160 1 420 volts and 60 1 1.2 H within 10 seconds after the start signal: the steady-state generator voltage and f requency $ hall be maintained within these l i m i t s du r i ng t h i s t e s t. -W+th i n 5 n imrtet-e ftte-teMhg- ' " -

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Verifying that the auto connected loads tu each diesel generator do not exceed the short time rating of 6697 kW; 9)

Verifying the diesel generator's capability to:

a)

Synchronize with the offsite power source while the fg generator is loaded with'its emergency loads upon a Wf simulated restoration of offsite power, b)

Transfer its loads to the offsite power source, and c)

Be restored to its standby status.

10) Verifying that with the diesel generator operating in a test mode, connected to its bus, a simulated Safety injection signal overrides the test mode by: (1) returning the diesel generator to stanO/ operation, and (2) automatically energizing the emergency loads with offsite power;

11) Verifying that the fuel transfer pump transfers fuel from each fuel storage tank to the day tank of each diesel via the in-stalled cross-connection lines;

12) Verifying that the emergency power sequence timer is OPERABt.E with the interval between each load block within i 10% of its design interval;

• !' spec!'icatter A.9.1.1.2'M)b) is not satk f acteri!y templeted, it-4 :mt necessary to repeat the pr.acading 2.t-bour--tast Instaad, the diesel g n n:"

y be eperateda b 6083 W f or--l -heur-or unt i l eperatrag-temperature-us jf

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See attached retype of guoposed changes to Technical Specifications. 1he attached ret)pe reflects the custently issutd version of Technical Specifications.

Pruding Technical Specification Chariges or Technical Specification (hunges issued Sulocquent to lHs subinitial are not erflected in the enclosed retype. The enclosed actype should he checked for continuity with Technical Spr(ilications prior to issuunte.

t llevision linen are provided in the right hand mergin to indicata a artision to the test.

No revirion buts are utilized when the page i$ changed solely to acconunoduse the shif ting of text due to additions or deletione..

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dalett I:s utg.1 tion sf l lee __rne Amendnjitt_}! nit!pt 91 10 Prynost d Cinnm i

Scabrook Station Technical Sper;fication Sunci lante llequirement 4Al.1.2f.7 cussently l

requirc6 that a si.nulated LOP /SI test be peiformed within 5 minutes of the diesel gancrator 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> run. The purpose of perfoiming the i OP!Si test within 5 minutes of completing the diesel generator 24 hou run is to ensure the diesel generator imi j

restart capability at normal operating temperature.

The cuteent surveillance i

requirement imposes iignificant schedulinn demands during a refueling outage by reducing schedule flexibility and unnecesprily conurainmg outage activities. l.icense

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Amendnent itequest 9110 scels to separate the LOP /S1 test frem the dicaci generator 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> load test and ins! cad seguin, that the dl%cl generatos be brought to its normal i

operating temperature by running the dic6el generaton at greater than or equel to 6083 kW for e least 60 minutes, and then Othin 5 minutes initiate the ! OP/SI test.

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The diesel generator 24 hout run of Surveillance llequirem:nt 4A1.1 ?f.7 demonstsates that the diesel generator is capable of c.arying an oserload for 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and a full load foi the remaining 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br />, that_ the soltage and frequency are at 41602420 volts and 6011.2 lir withiu 10 seconds alter the siast signal and that they are maintained within ib-se liinits during the test, llegulatory Guide 1.108 Perindle Testi,pc of Dien1 ilustor UnJf. Ibed gs Onsite 1:lutronle Power Sutenn at Nuclear Power Plants.

llegulatory Position C.2.a.(5), which is the basis for the tequirement to perf im the LOl'/Si test within 5 minutes of completing the diesel generator 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> run, states

" demonstrate functional capability at full load ternperature conditions by terunning the test phase outlined in Regulatory Position C 2.a(1) and (2) above [the LOP /SI test) j immediately folloong (3) above lthe diesel pnerator 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> sun)? Separaling the two tests uoes not invalidate or reduce the effectiveness of either test psovided that normrl yerating tetaperatutes are established psior to luiforndng the I.OP/S! lest i

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Separating the diesel generator 24 hout run from the 1.OP/Si test will not affest the performaner of the diesel generator 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> run test. The dier.cl generaton will still be required to dernonstrate the capability of (arrying an overload and a full load for the esisting perie:Is and within the existing voltage and frequency requisements.

To ensure that the purpose of flegulatory Guide,1.108, lleputatory Pontion C.2.a.($)

is met, the acquirement for diese; generator operation for a udficient period of time to ullow stabili/ation of normal operating temperatures, one hour at a load of 608) LW, i

has been adde I to tht Technical Specifications. This alternative method of catablishing

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normal operating temperatures is already included b the Seabrook Station Technical Specifications, The foot not e (*) at the bottom of the page 3/4 h-7 states, *lf L.

Specification 411.1.2f.6)b) is not satisfactorily completed, it is not necessary to repeat the preceding 24 hout test. Instead, the diesel generator may be operated at 6083 kW l

for 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> or until operating temperature has raabilized?

NiiY dickel generator testing experience has demonstrated that operation of the dicsci generator under a load of 6033 kW results in the diesel generator reaching normal operating temperatures in less than 1 hout and that this temp rature iemains essentially constant throughout the 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> run. NilY has verified this through a leview of diesel generator snonthly Technical Specifkation surveillance data. Operation of the dicsci generator for the eu,tra 23 hours2.662037e-4 days <br />0.00639 hours <br />3.80291e-5 weeks <br />8.7515e-6 months <br /> does not establish any LOP /SI test pre requisites that b

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are not already established by u 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> s un at a load of 6083 kW. The manufacturer of the Scablook Station diesel generators Colt industries, has documented by lettei that opecation of the diesel generator for at least one hour at a load of 6083 kW should establish stable operating tempriatures.

i The NitC has previously reviewed and apprmed the separation of the diesel generato.

24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> run and the LOP /SI test at other plants (e.g., Grand Gulf Noelcar Station Duit 1, Amendment No. 52 to License No, NPr.29; River llend Station, Unit 1, Amendment No. 43 to License No, NPF 47; and Virgil C. Surnmer Nuclear Station, Unit 1,

l Amendment No. 99 to 1.ieense No. NI'F-12). These previous reviews are applicable to this proposed Technical Specification thange, in summary, the N1(C Staff found that r

performing the diesel generator start and s, quencing test (i.e., the 1.Ol'/SI test) af ter the diesel gencrutor operating temperatures have reached their normal values fulfills the intent of performing the test within 5 minutes of the diesel generator 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> ruri.

The requested Technient Specification change to run the diesel generator loaded to at least 6083 kW for I hout prior to peiforming the I.OP/SI test remains consistent with ihe purpose of Regulatory Guide 1.109, Regulatory Position C.2.a.($).

t he requested change also maintains u consistent level of safety since the conditions under which the LOP /S! test is performed remains the same as thor,e currently required by Surveillance Requirement 4.8.1.1.2f 7 in conclusion; based upon the purpose of flegulatory Guide 1.104 and based upon the cont.istency between the requeited amendment and the current Surveillance Iteqt.irernent 4.8.1.1.2f.7), wit h respect to the surveillance conditions and objectiscs, there is no i

- increase in the safety consequences associated with the requested amendment.

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OPERATING SURVEllLANCE RE0VIREMENTS 4.8.1.1.2 (Continued) a)

Verifying deenergization of the emergency busses and load shedding from the emergency busses, and b)

Verifying the diesel starts on the loss of offsite power signal, energizes the emergency busses with permanently connected loads within 12 seconds, energizes the auto-connected shutdown loads through the emergency power sequencer and operates for greater than or equal to 5 minutes 1

while its generator is loaded with the shutdown loads.

After energiration, the steady-state voltage and frequency of the emergency busses shall be maintained at 4166 2 420 volts and 60 i 1.2 Hz during this test.

5)

Verifying that on an 51 actuation test signal, without lost-of-offsite power, the diesel generator starts on the auto-start signal and operat.es on standby for greater than or equal to 5 minutes.

1he generator voltage and frequency shall be 4160

• 420 volts and 60-t 1.2 Hz within 10 seconds after the auto-start signal; the steady-state generator voltage and frequency shall be maintained within these limits during this test; 6)

Simulating a loss-of-offsite power in conjunction with an S1 actuation test signal; and a)

Verifying deenergization of *.he emergency busses and load

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shedding from the emergency busses; b)-

Verifying that within-5 minutes of operating the diesel generator for at least 60 minutes at a load of greater than or equal to 6083 kW that, +.he diesel starts on the auto-start signal', energizes the_ emergency busses with permanently connected loads within'10 seconds,) energizes the auto-connectedemergency(accident loads throunh the emergency power sequencer and operates for greater than or equal to 5 minutes while its generator is loaded with the emergency loads. After energization, the steady-state voltage and frequency of the emotgency busses shall be maintained at 4160

• 420 volts and 60

• 1.2 Itz during this test; and

-c)

Verifyir.g that all automatic diesel generator trips, except engine overspeed, low lube oil pressure, 4160-volt bus fault,

.and generator differential, are automatically bypassed upon loss of voltage on tne emergency bus concurrent with a Safety Injection actuation signal.

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4.8.1.1.2 (Continued) 7)

Verifying the diesel generator operates for at least 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

During the first 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> of this test, the diesel generator shall be loaded to greater than or equal to 6697 kW and during the remaining 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> of this test, the diesel generator shall be loaded to greater than or equal to 6083 kW.

The generator voltage and frequency shall be 4160

• 420 volts and 60

• 1.2 Hz within 10 seconds after the start signal; the steady-state genera +0r voltage and frequency shall be maintained within these limits during this test.

E 8)

Verifying that the auto-connected loads to each diesel generator do g

not exceed the short time rating of 6697 kW; 9)

Verifying the diesel generator's capability to:

a)

Synchronize with the offsite power se'irce while the generator is loaded v.ith its emergency loads upon a simulated restoration of offsite power, b)

Transfer its loads to the offsite power source, and c)

Be restored to its standby status.

10)

Ver;fying that witn the diesel generetor operating in a test mode, connected to its bus, a simulated Safety injection signal overrides the test mode by: (1) returning the diesei generator to standby operation, and (2) automatically energizing '.he emerge;,cy loads with offsite power; 11)

Verifying that the fuel trader pump transfers fuel from each fuel storage tank to the day tank, of cath diesel via the ir..;talled cross-connection lines; 12)

Verifying that the emergency power. c ce timer is CPERABLE with the interval between each load black.ithin i 10% of its design interval; f

SEABROOK - UNIT 1 3/4 8-7

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,Qtunulp.31[on of Sicnificant llurards for I.lcense Amenj! ment Reunut,9J 10 Prons.tl.

Che nner 1,

. The proposed changes do not involve a sigdicant increase in the probability or consequences of a accident previously evaluated.

The proposed revision of the test sequence does nat alter the operation of the diesel generators or the associated response circuitry. The proposed test sequence continues to verifw that the diesel generators will respond to a LO P/SI and reenergi/c the emergency busses as assumed in the accident analyses. The purpose of performing the LOP /S1 test within 5 minutes of the diesel generator 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> run is to demonstrate the functional capability of the diesel gencrutor at normal operating temperature conditions, The establishment of normal operating temperatuie conditions with other than a 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> run provides the necessary initial conditions for the LOP /SI test. The proposed method of establishing normal operating temperature conditions has been previously revsewed by the NRC and found to be an acceptable alternative to the diesel generator 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> run. Since the plant response to an accident will not change there is no change in the potential for an increase in the release of radiation to the public. As there is no change in the potential for an increase in the release of radiation to the public it follows that the consequences of an accident, as measured in terms of dose, wdl not increase due to the proposed revision to the diesel generator ter. ting sequence.

The proposed revision of the diesel generator testing sequecce for the LOP /SI test does 7

not change the function or operation of any plant equipment or affect the response of that equipment if it is called upon to operate. The response of the diesel generators

.and the electrical system as described.in UFSAR Section 15.2,6 will be unchanged as a result of Cne proposed changes in the test sequence. Therefore, the diesel generators will continue to function as designed with no adverse affect from the proposci test sequence. and there will be not be a significant increa.c in the probability of an accident previously cw "ed.

'he propot' c r. n.,

do not create the possibDity of a new or different kiad ccident previously evaluated.

of accident %e a

!The proposed revisis, N N liesel generator test sequence dpes not change the dicsci generator design or 1/n:n - affect the operation of any plant equi ment or introduce l

-any new failure mechauams, The proposed revision to the diesel generater test

-sequence does not affect the test results, does not result in a decrease in diesel generator testing and th_e diesel generators are still verified to be operable and their response to a LOP /SI will be unchanged, in additioni the surveillance testing proposed is consistent with the testing currently required by the Technical Specifications. The previous accident analyses are unchanged and bound all expected plant transi nts and

- therr -are no new or different-accident scenarios created. Therefore, this change does not create the possibility of a new or different kind of accident from any accident -

previously evaluated.-

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-The proposed changes do not result in a significant reduction in-the margin of safety.

The Bases of Technical Specification 3/4.8, Electrical Power Systems, state that the operability of the AC and DC power systems and the associated distribution systems ensure that sufficient power will be available to supply the safety related equipmcot required for safe shutdown of the plant and mitigation of accident conditions. The Bases also state that the surveillance requirements for determining operability of the diesel generators are in accordance with the recommendations of Regulatory Guide g

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1.108, Revision 1.

The proposed changes to the surveillance testing requirements nf the diesel generators will continue to verify that the diesel generators are operable.

The proposed testing meets the intent of Regulatory Guide 1.108, Revision 1 and will adequately demonstrate the uiesel generators' functional capabiluy at normal operating temperature conditions, thus ensuring the designed margin of safety in the diesel generators' ability to start and accep. required loads in the prescribed time. Therefore, the assumptions in the Bases of Technical Specificati sns aie not affected and this change does not result in a significant reduction in the margin of safety.

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. Proposed Schedule for l>l,renAmendment issuunce ard I:Tirs,tlitjtt u s

New llampshire Yankee requests NRC review of License Amendment Request 9110 and issuance of a license amendment having immediate effe w eness by August 1,-1992.

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The Technical Specification changes proposed herein will enhance safe operation by alleviating outage related 'acheduling problems associated with the current Technical j

Specification Surveillance Requirement 4.8.1.1.2 which couples the !.OP/SI and 22 hour2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br /> run surveillance, v

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VII. 'I'uvironmental Impact A**cs* ment

.j New llampshire ' Yankee (NilY) has i* viewed the proposed license amendment against the criteria of-10CFR5L22 for environmt nial considerations. The proposed changes do -

not involve a significant hazards consideration, nor increase the types and amounts of effluentr, that may be released offsite, not significantly increase individual or cumulative occupational radiation exposures. Based on inte foregoing, NilY concludes that the proposed change meets the criteria delineated in 10CFR51.22(c)(9) for a categorical exclusion from the requirements for an linsironmental impact Statement.

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