ML20196H932

Proposed Tech Specs Reducing RCS Temp & Revising Volumetric Min Flow Rate

ML20196H932
Person / Time
Site:	San Onofre
Issue date:	12/04/1998
From:	SOUTHERN CALIFORNIA EDISON CO.
To:
Shared Package
ML20196H927	List: ML20196H921 ML20196H932
References
NUDOCS 9812090229
Download: ML20196H932 (2)

Text

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RCS DNB (Pressure, Temperature, and Flow) Limits

- l B 3.4.1 l

l BASES . ,

P SURVEILLANCE SR 3.4.1.2 REQUIREMENTS  ;

(continued) Since Required Action A.1 allows a Completion Time of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> to restore parameters that are not within limits, the 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Surveillance Frequency for cold leg temperature is sufficient to ensure that the RCS coolant temperature can be restored to a normal operation, steady state condition ,

i following load changes and other expected transient operations.

The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> interval has been shown by -

operating practice to be sufficient to regularly assess for  ;

potential degradation and to verify operation is within safety  !

analysis assumptions.  :

SR 3.4.1.3 The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Surveillance Frequency for RCS ' total flow rate has  !

been shown by operating experience to be sufficient to assess for potential degradation and to verify operation is within safety analysis assumptions.

The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Surveillance Frequency for RCS total flow rate is  ;

normally performed using the Core Operating Limits Supervisory System (COLSS) generated flow. COLSS utilizes sensor inputs of RCP speed, RCP differential pressure, cold leg temperature, and Pressurized pressure to calculate the volumetric flow through each RCP. Total RCS flow is then calculated by COLSS as the sum of the flows of each of the four RCPs.

" hen COLSS is cut of service, RCS Mass rio rate is dctermined manu al'.y . An tvaluatica cf th; htet t;' ante httutta primary and secandary plant pc crs is the pccfccrid acthadclagy tc determinc RCS Mass ricwrate. .

WfiinIflii[C6fi[0FeWEUiiTL3 ffff!SUpi~nTiBFissilisiii!(i ciF1 owtra tel off s er.vi ce MReac to r? Cool an tiSis't en0 (nC$h vol umet r 1 sid.e termi nsd;manu al l yMAnleval ua ti onlofehej hesltibal ance_ l betweentp e niethodiq.rimary;and; secondary;plantipowersgis1the;preferr dThi ma s s ifl owi rate t and s then = conv ert i ng Ai tstoivol ujis t ri c4 fl ow ; ra te  !

h s'i ng [t he).RCS [fl u1 Fcondi ti on Qa tit heldi khsWJe70fiths3 esc tof  !

Coolant!Pumpsi(RCP)) Another acceptable methodology is to determine RCS Mass Flowrate by performing an evaluation of the differential pressure across each RCP.

l l

f 9812090229 981204 i PDR ADOCK 05000361 (continued) l P PDR l SAN ON0FRE--UNIT 2 3.4-5 Amendment No. 127 l

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~

4 RCS DNB (Pressure, Temperature, and Flow) Limits -

B 3.4.1 BASES. ,

SURVEILLANCE SR 3.4.1.2 REQUIREMENTS  ;

(continued) Since Required Action A.1 allows a Completion Time of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> '

to restore parameters that are not within limits, the 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Surveillance Frequency for cold leg temperature is sufficient to ensure that the RCS coolant temperature can be restored to a normal operation, steady state condition following load changes and other expected transient operations. 1 The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> interval has been shown by '

operating practice to be sufficient to regularly assess for potential degradation and to verify operation is within safety analysis assumptions. I l

SR 3.4.1.3  !

l The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Surveillance Frequency for RCS total flow rate has  ;

been shown by operating experience to be sufficient to assess i for potential degradation and to verify operation is within I safety analysis assumptions.

The 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> Surveillance Frequency for RCS total flow rate is  ;

normally performed using the Core Operating Limits Supervisory )

System (COLSS) generated flow. COLSS utilizes sensor inputs of RCP speed, RCP differential pressure, cold leg temperature, and Pressurized pressure to calculate the volumetric flow through each RCP. Total RCS flow is then calculated by COLSS as the sum of the flows of each of the four RCPs.

i

her.

. COLSS is cst of servicc, ",CS Mass Flcwratt is detcrmined )

ggrpg(({ ] gyg{ gay {qg_g(j.igJ.cg{_gg{gggejgpygg.;. p 7,gg j omso H. ' ". ", ' #. " ". '. ' 's o_ .' '

' m". ". . " " ."~3 r

~

WhsiE16RC6 fit 0FEFifihiTOiilGSiipiEV} $6?f;ISiifsWI(COLSS)li.s f o6f of s s erv i ce n Rea c t06 Coolin tisys t em 7 (RCS) d Vol u' met ri c 710w ! ra te isidet. ermined manually 4 f Anievaluationloffthetheatibalanhe betWeenlprimaFyiandisecondaff!;plantVpofwersliisithe preferfed ine_t hod QT he.[heitji bal a nceli nvol vE sj fi rs tidet e rmi ni ng st he} RCS ina s s sfl owi ra t e f a'nd ithen / conv ert i'ng zi tit Rvol umst ri c ifl os t ra ts_  !

insingithelRCMfluid/conditionsiat thei;dischargefoQthe); t Reactor Coolant;fumpsj(RCPs): Another acceptable methodology is to deterniine RCS Mass Flowrate by performing an evaluation of the differential pressure across each RCP.

(continued)

SAN ON0FRE--UNIT 3 3.4-5 Amendment No, tM

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