ML20079E671

Proposed Tech Specs Re Surveillance Requirements for Centrifugal Charging Pump Lines

ML20079E671
Person / Time
Site:	Comanche Peak
Issue date:	10/01/1991
From:	TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:
Shared Package
ML20079E669	List: ML20079E668 ML20079E671
References
NUDOCS 9110070257
Download: ML20079E671 (9)

Text

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ERGENCYCORECOOLINGSYSTEMS SURVtf LLANCE REDUIRE"ENT5 (Continuedi

, 2) At least once per 18 months:

CCP/SI System $f System Y1 ve Nu*Dir 1 Vaive Nu*ber

$1 881,*T St.8422A St.8616A St.88108 51 88228 51 88168

$1 8810C SI 8822C 51 8816C

$1 88100 $1 88220 51 88160

h. By performing a flow balance test, during shutdown, following completion of modifications to the ECCS subsystems that alter the subsystem flow characteristics and verifying that:

)

i

1) For centrifugal charging pump lir.es, with a single pump running:

4) The sum of the injection line flow rates, excluding the hig t flow rate, is greater than or equal to , and i b) The total pump flow rate is less than or ecual to $60 gpe.

2) For safety injection pump lines, with a single pump running:

a) The zum of the cold leg injerction line flow '

rates, excluding the htgh flow rate, is greater than or equal to g,and b) The total pump flow rate is less than or equal to 675 gps.

3) Eer RHR pump lines, with a single pump running, the stas of the cold leg injection itne flow rates is greater than or equal to 4652. gas.

1. Prior to entering M00E 3 and following any maintenance or operations activ' ty which drains port ons of the system by.

venting the ECCS pump casing and acces:ible discharge piping high points.

COMANCHE PEAK . UNIT 1 3/4 5 6

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ENtMfhtY CORJ COOLING $YSTEMS SURVt1LLANtt RE0UIREW[NT5 itentinued)

^2) At least once per 18 months:

CCP/51 Systas SI Svitag DhaNuscar Valve Nweber ll 641M $1.H22A s!.8416T SI M108 11 64218 SI.H168 51 4810C 51 5822C $1 8416C SI H 100 5!.48120 51 84160

n. By performing a flow balance test, during shutdown, following completion of modiftettions to the (CC$

subsystems that alter the subsystem flow characteristics and verifying that:

1) For centrifugal charging pump lines, with a single pump runnings a) The swa of the injection line flow rates, excluding the highest flow rate, is greater than or equal to Q gps, and 243 b)

@ The todt 1 pump flow rats is less t an or equal Spa-

@_ For safety t.EE!3 injection pep lines, with a single pump 1) runnings a) The sus of the cold leg injection line flow rates, excluding the high ow r creat.,tha. .r i s. S f' y , ate, d isu4 b

@ L) 3Thed1 5"' pump f1w rate is less than or equal

3) For RHR pump lines, with a sigle pump running, the sus of the cold leg in,)w? en ine flow rates gttater thu or equal ig E45tligpe. 45'2 w

1. Prior to enturing MODE 3 and following my maintenuce or operatter.: activity which drains portions of the systes by venting the ECCS pump casing and accessible discharge piping high peints.

l COMANCHE PEAX - UNIT 2 3/4 5 4 MAY 9. 1991

N SE 91-126 ATTAClIMENT 2 WPT-13966 Reduced ECCS Flows - Impact on Containment Mass & Energy

WPT 13966 ET NSL-0$L 11 91 565 Westinghouse Energy Systems $ast!

"" * *" - 8 m ::

Electric Corporation September 27, 1991 Mr. W. J. Cahill, Jr., Executive Vice President S.O. No. TBX-4708 Nuclear Engineering & Operations TU Electric Company P. O. Box 1002 Ref: 1. WPT 13963 Glen Rose, Texas 76043 2. WPT-13927 TU ELECTRIC COMPANY COMANCHE PEAK STEAM ELECTRIC STATION REDUCED ECCS FLOWS - IMPACT ON CONTAINMENT MASS & ENERGY Mr. Cahill:

Per a request of Mr. Ali Tajbakhsh of your organization on September 27, 1991, and in support of Safety Evaluation SECL 91 367 transmitted via the above Reference 1, the following information is provided.

Tne revised minimum ECCS perfonnance data for Comanche Peak Units 1 and 2 was provided via Reference 2 above. This data represents ECCS ,erfonnance with the Centrifugal Charging and Intermediate Head SI pumps throttled to prevent pump runout beyond 560 gpm and 675gpm, respectively, during the cold and hot leg post accident recirculation modes of operation. Maximum ECCS performance data will not be increased as a result of this modification.

Further, there is no impact on the Comanche Peak LOCA Mass & Enargy Release Analysis because the plant is maximum Si flow limited, and therefore the revised minimum SI flows would not affect the limiting transient.

If there are any questions please contact Roy Owoc on 412 374 4037.

Very truly yours, WESTINGHOUSE ELECTRIC CORPORATION R. H. Owoc

{-

S5l J. L. Vota, Manager Comanche Peak Projects w' s- '-"'t '9 =

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ENCLOSURE 3 TO TXX-91369 MARKED UP TECHNICAL SPECIFICATIONS FOR OPERATION OF COMt.NCHE PEAK UNIT 1 Wi1H REVISED ECCS FLOW BALANCE CRITERIA

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EMERGENCY CCDE CCOLING Sv5 TEM?

3/4.5.2 ECCS SUB'5YSTEMS - T,y  ; 350 F LIMIT]NG C0t4DIT10N FOR OPEDATION 3.5.2 Too indepencent Emergency Core Cooling System (ECCS) subsystems shall be OPERABLE .ith each subsystem comprised of:

a. One OPERABLE centrifuga'. charging pump,

b. One OPERABLE safety injection pump,

c. One OPERABLE RHR heat exchanger,

d. One OPERABLE RHR pump, and

e. An OPERABLE flow path capable of taking suction from the refueling water storage tank on a Safety injection signal ano automatically opening the containment sump suction valves during the recirculation phase of operation.

APPLICAB]LITY: MODES 1, 2, and 3*

ACTION:

a. With one ECCS subsystem inoperable, restore 'he inoperaole subsystem to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in t least HOT STANDBv within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in HOT SHUT 00WN .ithin the following 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />.

b. In the event the ECCS is actuated and inject 2 .ater into tne Reactor Coolant System, a Special Report shall be prepared and submitted to the Commission pursuant to Scecification 6.9.2 ,,itnin 90 days describ-ing the circumstances of the actuation and the total accumulated actuation cycles to date. The current value of the usage factor for each affected Safety Injection no:Zle shall be provided i n this Special Report whenever its value exceeds 0.70.

• The provisions of Specifications 3.0.4 and 4.0.4 are not applicable for entry into MODE 3 for the centrifugal cnarging pumps and the safety injection pumos declared inoperaole pursuant to specification 3.5.3 provided the centrifugal charging pumps and the safety injection pumps are restored to OPERABLE status within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> or prior to the temperature of one or more of the RCS cold legs exceeding 375 F whichever comes first, COMANCHE PEAK - UNIT 1 3/4 5-3

4 e- '" "

- .. 13 ? 5TIMF sb '.. CMENT5 Sb, FC se't-::em shall be cemonstrated OPERABLE:

h30

,J,' ce per 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />so 'y verifying thLt the following valves are

+

^W}fi /-- a poe.'tions with power to the valve operators removeo:

, 3 J W.01 N ot r salve Function Valve Dosition

..r , ?i.

Pi 31.k 4

.s &B 51 Pump to Hot uegs C ' . ;ec 1

B, C, O Accum. Di;; arge Open*

^2)4

~

.- 980. ' & C RHR to Cole Legs Open 6835 51 Pump to Cold Legs Open 8840 RHR to Hot Legs Closed 880G SI Pump Suction from RWST Open 8813 51 Pump Mini-Flow Valve Open

c. Ac least one.e per 31 days by verifying that each valve (manual, oower-operated, or automatic) in the flow path that is not locked, sealeo, or otherwise secured in position, is in its correct position.

c. By a visual inspection which verifies that nc loose detris (rags,

' rash, clothing,

, c. ) is present in the containment whicn could De t-ansrcrted to the convainment sun.p and cause restriction of the pump suctions during LOCA conditions. This visual inspection shall be performed:

1) For all accessible areas of the contai- ent crior to establish-ing (CNTAINMENT INTEGR:TY, and

2) Of the areas offected within containue"; at the comp.et'on of each coritainment entry when CONTAINMENT lNTEGRITY is established.

b d. At 'k2st once per 15 months by: -

1) Verifying automatic isolation and interlock action of the RHR system frun the Reactor Coolant 5ystem to ensure that; a) Witn a simulated o actual Reactor Coolant System pre:<.ure tignal greater than or_ec"al to 442 peig the interlockt prevent the valves #ron being opened, e.o t, ) With a simulated or actual Reactor Coolant Sustem pressure signal less than or equal to 750 asig the interlocks will cause the valves to automatical'y close.

" Surveillance Requirements covered in Specification 4.5.1.1.

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COPANCHd ?EAK - UNIT 1 3/45-4 l

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EMERGENCY CORE COOLING SYSTEMS w

SURVEILLANCE REQUIREMENTS (Continuea) _

2) A visual insper ... of the containment sump and verifying that the sobsystem suction inlets are nat restricted by debris and that the sump components (trash racks, screens, etc.) show no evidence of structural distress or abnormal corrosion.

e. At least once per 18 months, during shutdown, by:

, 1) Verifying that each ao+omatic valve in the flow path actuates to its correct position on Safety Injection actuation test signals, and

2) Verifying that e- a of the following pumps start automatically upon receipt of a Safety Injection actuation test signal:

a) Centrifugal charging pumps.

b) Safety injection pumps, and

j. c) RHR pumps.

f. Bv verifyinn that each of the following pumps develops the indicated differentia pressure on recirculation flow when tested pursuant to Specification 4.0.5:

1) Centrifugal charging pu:ap > 2370 ps d, i

2) Safety injection pump 3 1440 psid, and 3' RiR pump > 170 r J.

g. Oy verifying the correct position of each mechanical position stop for the following ECCS throttle valves:

1) Within 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> following completion cf each valve stroking operation or maintenance on the valve when the ECCS suosystems are t equired to be CPERABLE, and

2) At least once per 18 months.

CCP'SI System Va'ive Nuhber 51 System Valve Number SI-8810A SI-8822A SI-8816A SI-8810B SI-8822B SI-6816B SI-8810C SI-8822C SI-8816C SI 88100 51-8822D SI-88160 COMANCHE PEAK - UNIT 1 3/4 5-5 1

o.

EMERGENCV CCRE ".CCLING 3r$' EMS SURVEILLANCE RE(JIREMENTS (Continuen)

h. 3y performing a flow' balance test, during shutdown. following com-oletian.of mocifications to the ECC5 subsystems that alter tne i sucsjstem flaw characteristics and verifying that:

l .-

1) For centrifugal charging pumo lines, with a single pump running:

a) The sum of the injection line flow rates, excluding the righest flow . rate, is greater than or equal to M S gpm, and-gq,g w

b) The total pump flow rate is less than or equal to 560 gpm,

2) For safety injection pump lines, with a single pump running:

l- a) The. sum of the cold leg injection line flow rates; excluding

! tt.e nignest flow rate, is gt'*ter than or equal to gpm,

) and g' b) The total pump flow rate is less than or et,Jal to 675 gpm.

3) For RHR pump lines, with a single pLep unning, the sum of the colc leg injection line flow rates is - eater than or equal to L 4652 gpm.

i. Prior to entering MOPE 3 and following a'ny raintenance or operations activity onich drains portions of the system oy unting the ECCS -

pump casing and accessible discharge piping high points.

i o

CCHANCHE PEAK ~~ UNIT 1 3/ 4 5-6

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