W3P84-0405, Forwards Info Re Changes to Component Cooling Water Sys to Ensure Cooling to Reactor Coolant Pump Seals in Event of Inadvertent Safety Injection Actuation Signal.Info Includes Summary,Safety Evaluation & marked-up FSAR Pages

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Forwards Info Re Changes to Component Cooling Water Sys to Ensure Cooling to Reactor Coolant Pump Seals in Event of Inadvertent Safety Injection Actuation Signal.Info Includes Summary,Safety Evaluation & marked-up FSAR Pages
ML20080P408
Person / Time
Site: Waterford Entergy icon.png
Issue date: 02/16/1984
From: Cook K
LOUISIANA POWER & LIGHT CO.
To: Knighton G
Office of Nuclear Reactor Regulation
References
W3P84-0405, W3P84-405, NUDOCS 8402220536
Download: ML20080P408 (37)
v • d • e


Text

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%T LoulSIANA / ,4a o-o~ae ermer . oooxeme POWER & L1GHT / NEW CALE ANS LOUGANA 70174-0000 . (504)368-2345 MIDDLE SOUTH UT!UTIES SYSTEM February 16, 1984 W3P84-0405 3- A1.01.04 Q-3-B41 Director of Nuclear Reactor Regulation Attention: Mr. G.W. Knighten, Chief, Licensing Branch No. 3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C. 20555

SUBJECT:

Waterford SES Unit 3 Docket No. 50-382 Changes To Component Cooling Water System To Enhance Availability Of Cooling To Reactor L slant Pump Seals

REFERENCE:

W3P83-4150 dated December 29, 1983 ENCLOSURES: (1) Description of Change and Safety Evaluation (2) FUSAR Change Request (3) Revised Control Wiring Diagrams

Dear Sir:

In the referenced letter, we informed you that LP&L was making certain changes to the Waterford 3 Component Cooling Water (CCW) System. The objective of these changes is to ensure the availability of CCW to the Reactor Coolant Pump seal coolers in the event of an inadvertent Safety Injection Actuation Signal (SIAS), as well as for certain non-LOCA depressurization events addressed in Generic Letter 83-10a.

On January 26, a meeting was held in Bethesda, Maryland among members of the NRC, LP&L and Ebasco staffs at which the design details of the change were presented. These changes do not puse an unreviewed safety issue and, in fact, increase the overall safety of the plant.

The purpose of this letter is to inform you that we are proceeding to implement these changes prior to fuel load. Enclosed please find appropriate documen-tation in the form of a summary description of the change and a safety evaluation, a FUSAR change package, and design drawings.

8402220536 840216 PDR ADOCK 05000382 A PDR \

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s s 7 Page 2 W3P84-0405 3-A1.01.04 Q-3-B41 Should you have any questions or comments on this matter, please feel free to c.ontact Mike Meisner at (504) 363-8938.

Very truly yours, K. W. Cook Nuclear Support & Licensing Manager KWC/FUM/ch Attachments cc: W.M. Stevensen, E.L. Blake, J. Wilson, R. Stevens (NRC/ICSB),

J.S. Wermier (NRC/ASB), Y. Leung (NRC/RSB), Y.S. Huang (NRC/CSB),

C.L. Constable

b ENCLOSURE (1)

DESCRIPTION OF CHANGE AND SAFETY EVALUATION (See Simplified CCW Flow Diagram Attached)

I. PRESENT DESIGN The Waterford-3 CCW System is described in FSAR Sections 9.2.2 and is shown in FSAR Figure 9.2-1. The Reactor Coolant Pumps are described in FSAR Section 5.4.

II. PROBLEM Both SIAS and CIAS are actuated via either a low pressurizer pressure or a high containment pressure signal. Under the present design, CCW to the RCP seal coolers will be isolated by either of these signals.

Automatic closure of the CCW header isolation valves (3CC-F120A, 122A, 121B,123B) on SIAS or automatic closure of the CCW supply and return containment isolation valves (CIV's) (2CC-F146A/B, F243A/B and F147A/B) on CIAS will therefore isolate CCW from the RCP's.

Once this isolation takes place via a valid or inadvertent SIAS or CIAS, the operator would have to manually re.. pen the header isolation valves and the CIV's. Though the RCP's have been tested to demonstrate that they can operate acceptably without CCW for 30 minutes (see response to FSAR Question 010.15), such manual intervention would have to take place within 10 minutes in order to maintain a high degree of confidence that the seals will not suffer degradation. During this critical initial period after an ESFAS, the operator's attention should be totally dedicated to diagnosing the problem and taking essential steps l to bring the plant to a safe condition.

i III. OJBECTIVE OF CHANGE I

The objective is to ensure that CCW will continue to provide cooling to the RCP seal coolers af ter an SIAS or CIAS is generated by low pressurizer pressure without relying on operator action. This goal is in keeping with the " trip two/run two" strategy of the CE Owner's Group that will be adopted by LPtL at Waterford-3. It is also in 1

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o keeping with the intent of the guidance contained in Generic Letter 83-102 (Resolution of TMI Action Item II,K.3.5 " Automatic Trip of Reactor Coolant Pumps"). At the same time, this change will ensure that Waterford-3's design philosophy of physical separation and isolation of redundant trains for safety related systems, such as CCW, after any ESEAS is maintained, and that the CCW piping to and from the RCP's is isolated automatically on a large LOCA or MSLB, or any accident yielding elevated containment pressure.

It may be said that since the Containment Isolation Valves providing CCW to the RCP's are now dependent on a high containment pressure actuation signal, they therefore do not meet diverse isolation criteria. We feel, however, that since the concept of providing CCW to the RCP's for certain accidents is endorsed by NRC, the actual intent is met. CSAS is a fully qualified and NRC approved part of the Waterford-3 Plant Protection System (PPS). Such isolation, referred to as " Phase B" isolation in the terminology of ANS 56.2, which is endorsed by RGl.141, has industry precedent.

IV. DESCRIPTION OF CHANGE A.

SUMMARY

Upon SIAS or CIAS, the nonseismic, nonessential loop will continue to be isolated and the two redundant essential divisions of CCW will continue to be separated from each other. However, a flow path will be provided for CCW from the A train only to the RCP's and CEDM coolers. This will be accomplished by deferring closure of the header isolation valves on the A side (3CC-F120A, F122A) and the three CIV's from SIAS and CIAS, respectively to CSAS.

Upon CSAS, the flow pattern of CCW and separation configuration will be exactly as it is now after SIAS or CIAS.

B. DETAILS As noted above, in order to resolve the problem of providing adequate containment isolation and still provide continued availability of the RCP's, the containment isolation valves to

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and from the RCP's will close on CSAS rather than CIAS. The two header isolation valves will alsa now close on CSAS rather than SIAS. The adrantage of CSAS is that it is actuated on high con-tainment pressure with an interlock with SIAS, so that SIAS must be actuated as a prerequisite for containment spray actuation.

Actuation of CSAS, therefore, is a positive indication that there is either a LOCA event or a main steam line break in progress in the containment. In either event, the closure of the containment isolation valves in the CCW lines to the RCP's is in order.

The CSAS being used, as discussed above, is a four channel system as described in Section 7.3 of the FSAR and SER. It should also be noted that the instrumentation used in monitoring containment pressure for the purpose of actuation of SIAS and CSAS consists of independent loops that are not subject to a common fault.

In addition to the signal changes discussed above, the following other changes will be made:

Shutdown Heat Exchanger "A" Outlet Valve (3CC-F130A) - This valve will remain as is on SIAS and will open fully on CSAS. This is being done to reduce the demand on the "A" CCW pump which will be servicing the RCP's. The "B" SDHX outlet valve will continue to go full open on SIAS.

Fuel Pool Heat Exchanger TCV (3CC-TM138AB) - As before, CCW to the FPHX is isolated on SIAS. Now, however, SIAS will directly close this valve since the header valves on the "A" side will remain open on SIAS.

Letdown Heat Exchanger TCV (3CC-TM169AB) - The CCW to LDHX will be isolated but now it will close automatically when either letdown isolation valve, 2CH-F1518AB or 1CH-F2S01AB, on tDe CVCS side closes.

V. SAFETY EVALUATION-The following safety evaluation is based on the requirements and re-commendations for integrated Component Cooling Water System design as expressed in Standard Review Plan 9.2.2.

1. General besign Criteria (GDC) 2:

The above described change has no effect on the CCW System capability to meet GDC 2.

2. GDC 5: Not Applicable
3. GDC 44: As it relates to:
a. The capability to transfer heat loads from safety-related structures, systems, and components to a heat sink under both normal operating and accident conditions.

This change has no effect on the ability of CCW to transfer  :

heat loads to a heat sink under both normal and accident conditions. Under both SIAS and CSAS configurations, there are two separate divisions of CCW, each capable of removing 100% of the essential heat loads,

b. Component redundancy so that safety functions can be performed assuming a single active component failure coincident with losa of offsite power.

Component redundancy and the ability to meet a single active failure is not affected by this change (See FSAR FMEA T9.2-4).

c. The capability to isolate components, systems or piping, if required, so that the system safety function will not be compromised.

This change has no affect on this capability.

d. NUREG-0737 II.K.2.10 and II.K.3.25 This change has no affect on compliance with these two items.
e. (i) A single failure in CCW C as not result in fuel damage or reactor coolant leakage in excess of noraal coolant makeup capability. Single failure includes but is not limited to operator error, spurious activation of a valve operator, and loss of a cooling water pump.

This change has no effect.

(ii) Moderate energy leakage crack analysis (per BTF ASB 3-1).

This change has no effect on the moderate energy analysis of FSAR Sec. 3.6.

-(iii) Demonstration by test that the RCP's can withstand loss of I

cooling water for 20 minutes, and instrumentation to detect same is provided in control room.

This change has no effect on this requirement. As stated in FSAR Section 5.4.1.3 and response to FSAR QO10.15, a 30 minute test has been conducted successfully.

4. GDC 45: No Effect
5. GDC 46: No Effect
6. FSAR Chapter 15 Safety Analyses The safety analyses are not affected by this change. The actual setpoints are determined to ensure that the specified protective action is initiated at or before the analysis high pressure set-point is reached. The analysis high pressure setpoint of CSAS is the same as that of SIAS or CIAS, i.e. 5 psig. The actual instrument setting will be slightly different only due to the fact that independent instrument loops are involved.

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FUSAR CHANGE PACKAGE vies-rsa TABLE 6.2-:

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unter cettet fra Caetalummnes tee Coster Sette fe) 2CC-7166A/S 10 0 setterftp F mo 10 C 1 ICC-ele 2A/B I? Casseeeet Coolies amaneralised Wetor  !!!

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e Penetration Class D No. System Name Fluid (a) Type Demineralized Water III C 1

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25 Fuel Transfer Fuel Transfer Tube .

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Containment and Fuel Handling Building B1 26 Chemical & Volume Borated Water III

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Line Borated Water III D 27 Chemical 6 Volume Control Charging Line Primary Coolant III B1 28 Sampling Line from Reactor Coolant Line Primary Coolant III B1

- 29 Sampling Line from Pressurizer Surge Line Primary Coolant III B1 30-Sampling Line from Pressurizer Steam Space i

Waste Gas III Al 31 Waste Management from Containment Vent Header Safety Injection Borated Water IV D 32 from SIS Sump l

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  • Valve Vented / Drained eu Operator For Type "A" Test Valve Tag No, (Inch) Essential ion (b) Containment (* g No 2CC-F147A/B 10 .No 0 Butterfly P P 2CC-F243A/B 10 j I Butterfly

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P No(I 2CH-F1529A/B 2 Yes(*

0 - Gate 2 Globe S 1CH-E2505A

Yes 2SL-F1504A/B 1/2 No 0 G lobe P Globe P 2SL-F1501A/B 1/2 I

2SL-F1505A/B 1/2 No Globe P Yes 0 -

2SL-F1502A/B 1/2 Globe P I

Yes 2SL-F1506A/B 1/2 No 0 Globe- P 1/2 Globe P 2SL-F1503A/B I

Yes 2WH-F158A/B 1 No Diaphragm P 0 2WM-F157A/B 1 Diaphragm P I ,

No(* 2SI-L101A 24 Yes O Butterfly P No(*} 2SI-L102B 24 Yes Butterfly P O

- 2SI-E654 1-1/2 Yes O Globe S

- 2SI-E655 1-1/2 Yes O Globe S al..ent pressure boundary.

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Time Post- Power to Pipe itial(d) Actuat{oy Signal (see) Normal Shutdown Accident Operator Primary Secondary (ft-in)(g C8)' 28-3

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N/A No N/A 33 No N/A 6.2-206 Amendment No. 33, (9/83) 9

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6.2.4 CONTAINMENT ISOLATION SYSTEM ( s% cAosenoConvtwo"w+ SP f%dA ctu-b6 son Cyas (CSMS) vwm - - -

The Containment Isolation System (CIS) provides the means for isolating fluid systems that pass through the containment in order to confine any radioacti- /

vity that may be released following a LOCA or main steam line break (MSLB) /

ins.ide containment. The containment purge isolation signal (CPIS) also isolates the containment purge upon high radiation inside the <:entainment (see Section 7.6).

6.2.4.1 Design Bases 6.2.4.1.1 Conditions Requiring Isolation a) Automatic initiation of a containment isolation actuation signal l17 (CIAS) occurs when containment high pressure or low pressure in ~

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. pressurizer is detected. The CIAS closes all automatic isolation l33 12 2 valves in the lines penetrating the containment not required for the operation of the engineered safety features systems. 33 D

b) Main steam line and main feedwater isolation valves are closed auto-matically#following a secondary system line break or detection of g high pressure inside the containment. MSIS is generated by low steam generator pressure or high containment pressure, c) The containment purge is automatically isolated upon receipt of a high radiation inside containment signal and high activity in the 33 plant stack, and the ESF signal CIAS.

6.2.4.1.2 Criter - t for Isolation of Fluid Systems Penetrating the Containment a) Valves isolating penetrating lines serving engineered safety feature systems are not closed automatically by the CIAS, but have the ability to be closed by remote manual operation from the main control room, thereby isolating any engineered safety feature system which mal-functions.

b) All penetration assemblies and containment isolation valves are seismic Category I, Safety Class 2 (except for valves,inside contain- 22 ment, connected to the RCPB which are Safety Class 1) and are pro ,

tected from the effects of missiles and pipe break.

c) All piping penetrating the containment ve.ssel shell is designed to withstand at least a pressure and teis:perature equal to the contain-ment vessel design internal pressure and temperature and to with-stand the pos t-accident transient environment. In each of the four classes of penetrations listed belov, at least two barriers are pro-vided between the containment i ursphere and the outside atmosphere, so that failure of one valvt to. ose does not prevent isolation.

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6.2-62 Amendment No. 33, (9/83) i u _

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I TABLE 7.3-5 (Cont'd)

@pWuTS hC:tlAATCO Cd b l Actuation

_ Channel Action _ Component Taj Number A_ B, e .

Start Component Cooling Water Pump A X Component Cooling Water Pump B X Start A/B X 33 Start ( Component Cooling Water l' ump X

'FF-M

  • Y

-0; Z CS? ?/* ! M Y2!r I"'"

e t . . ._ a m . ., uv a Open CCW Outlet Valve from 3CC-F131B X Shutdown HX B Aux Component Cooling Water Pump A X ;0 Start X

Start

  • Aux Component Cooling Water Pump ,

B l33 Close CCW Pump A Discharge Header 3CC-F109A/B X Isolation Valve CCW Pump A Discharge Header 3CC-F110A/B X

/ Close Isolation Valve Close CCW Pump B Discharge Header 3CC-Fil2A/B X Isolation Valve 30 Close CCW Pump B Discharge Header 3CC-FlllA/B X Isolation Valve Clese CCW Pump A Suction Header 3CC-F113A/B X Isolation Valve Instrument Air Compressor A X Block Auto Operation X

Block Instrument Air Compressor B Auto Operation 3CC-Fil4A/B X Close CCW Pump A Suction Header Isolation Valve Close CCW Pump B Suction Header 3CC-Fil6A/B X 30 Isolation Valve 3CC-F115A/B X Close CCW Pump B Suction Header Isolation Valve CCW Train A Supply to NNS 3CC-F 122A X Clow b l o i m.. '.' u '.1 7.3-55 Arrendment No. 33, (9/83)

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TABLE 7.3-5 (Cont'd)

Actuation

_ Channel Action Componen_t Tag Number A_ E NWC 3CC-F123B X

'Close CCW Train B Supply to M Isolation Valve Close CCW Supply to NNS Isolation 3CC-F133A/B X Valve Ch CC Tr a i,-. 'at..  :: CT 3:C ~! C' -

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L ;!;t ;r ":'_';;

3CC-F121B X Close CCW Train B Return to CCW Pumps Common Suction Hdr Isolation Valve Close  ! 4 CCW Return fror NNS to CCW 3CC-F132A/B X Pumps Common Suction Hdr' Isolation Valve Remet to CCW Heat Exchanger A 3CC-TM290A X SIAS Temperature Control operational Valve node 33 CCW Heat Exchanger B 3CC-TM291B A Reset to SIAS Temperature Control operaticnal Valve mode 3 N-TMl3848 X Ath.rgiLh%d SC5b Mvwp%Spe W W e- fuec,

&( Mew EcW 3e4 7.3-56 Arnendment No. 33, (9/63)

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WSES-FSAR-UNIT-3 i TABLE 7.3-7 - ,

COMPONENTS ACTUATED ON CSAS Actuation Channel

, , Action Component Tae Number A, B, Start Containment Spray Pump A X Start Containment Spray Pump B X Open Containment Spray Isol 2CS-F305A X Valve Open Containment Spray Isol 2CS-F306B X -

. Valve Fail to start Cont. Spray Pump A Alann X Fail t9. start4 Cont. Spray Pump B Alarm X .

C\ese. Con 6 Atom ^tMArt a 2 Cc-R %AG X wive. - cco to EcPa u& CEon 's.

C \ese G^NL^"'^+ "5 Wive ccw fhem EcP's ^^g csDMs, , .

. C losc ("o^h (*M

R c F 's <4 J C 6 D Open cco cktle+ %lv e acc -wac>p g

& Sh%,t Hy 4 C les e.

ccco hv A Q/

10 AwS Tso/Argoa )

3cc-F/zz.A x VAIvt I

Close Mbu A QIg e u m rsd m 3 g_p g.g YA N 7.3-59 l 1

. . _ _ _- .a

' h ua i - -

.. .c . - -

C... m WS ES-ESA R-UNIT- 3 i

TABLE 7.3-8 (Cont'd) ,

(Cwmneocs Aeweeo en Cn95 1 -

Actuation Channel '

Action Conponent T Nueber y [ B,

,C, lose Containment Purge 2HV-B151A X Air Make-Up Isol Valve X 27 Close Containment Purge 2HV-B150B Air Make-Up Isol Valve Close Containment Purge 2HV-B152A X Air Make-Up Isol Valve 2HV-B155A X Close Containment Purge Exhaust Isol Valve 2HV-B154B X Close Containment Purge Exhaust Isol Valve 1 Close 's tontai'nment Purge 2HV-B153B X l 30 Exhaust Isol Valve 27 Close SI Tank Drain to RWP 2SI-F1561A/B X l 30 Cont Isol Valve (SI-682) 9er-r1LAa/n v ci e r ,_ oan emmit,g em+m, e ., e p i ),

C .: Icel "r!':

Y CI :e RCD Cre! rg "eter r et--- 'e c -F ' A ' A / "

27 v..._,. . . u i. _

"C" Cre!!n; " ter ret r-

  • re r147^/R Y CI ::

"--t I: 0 ! " ! "';

2CA-E604B X Close Containment Atmosphere RAD Monitoring Cont 2CA-E 605A X 2CA-E606A X Isol Valves 2HV-E633B X Close Containment Pressure .

Instrumentation Isolation Valve 2HV-E634A X 33 Close Containment Pressure .

Instrumentation ,

Isolation Valve

7. 3- 63c Amendment No. 33, (9/63)

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._e-USES-FSAR-UN17-3 Two CCW pumps normally operate. A third pump is provided as a standby.

The motors seperste of the twodivisions electrical normallyAoperating and B. pumps are connected to buses in - I The third pump is available to

' replace an on-line pump that is enable to perform its function. The stand-

by pump is connected to the A/B bus and may be manually aligned to either A  !

' Lt45ELT or s division (see subsection 3.3.1.2.3).

, .s

$4 Lggg . CCW pumps are connected on the passp suction and discha cooling water into common headers serving safety and nonsafety equipment.

-puring the accident mode, a SMsisolates~the~ redundant safety related E b , .# ^... -

loops froaJanch.other-and both^from the monessential equipment. The isole-7 "~

tion of the-eedundant safety-related-40W-loops -is achieved by' two valves irr-series.

  • yollowing isolation, separate CCWS channels -are formed, and each supplies cooling water in sufficient quantity and at the required temperature to remove 100 percent-of the heat accessary to shutdown the reactor.

The required NPSH for the CCW pumps is provided by a surge tank located -

approxia'ately 70 ft. above the pumps. .The surge tank is provided with a baf fle plate and redundant level indication and controls to ensure that water loes in one CCWS channel will not affect the redundant channel operation.

Overflow Waete from the Managenent Syatea. surge tank is piped to the vast g g (ing to th Le w .krtesW..w Levau, ulm /Sc urE Yhe chemical feed tank in the systes permits manus

& c frsrco.rsvcd4 W W sw on- ine addttion of pro-per corrosion inhibitor. A commercial nitrite based corrosion inhibitor is used s,s tem.to maintain proper corrosion protection for the Component Cooling Water 26 A continuously operating radiation monitor is provided in each of the re-l dundant headers on the discharge loop of the CCW pumps. Addit.ional radia-tion monitoring is provided to monitor radioactivity of the cooling water from the components inside the containment; i.e., reactor coolant pump, motor an'd seal coolers, and control element drive mechanism. Should activity in the system rise above the set limit, a high radiation alare is actuated in the main control roca. A more complete discussion of the CCWS radiation monitors la provided in section 11.5. ,

9.2.2.2.2 Auxiliary Component Cooling Water System The ACCWS removes heat, when required from the CCWS via the CCW heat ex-changer during normal operation, normal . shutdown, and accident conditions, and transfers it to the wet cooling towers for dissipation to the atmos-phere. The ACCWS is requi ed to operate whenever the heat rejection caps-city of the CCWS is exceeded (LOCA conditions), or whenever the ambient '

conditions prevent the CCWS from rejecting its required heat load.

The temperature controls for the ACCWS components are described in Table 9.2-2 and in Subsection 9.2.5. The ACCUS consists of two 100 percent caps-city, independent loops. gach loop includes a pump, and an evaporative wet )

type mechanical draft cooling tower. gach tower has a basin which is capable i

of storlag sufficient water to bring the plant to safe shutdown under all

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  • m 8"**-* N " "

INSERT A The CCWS supplies cooling water to two redundant safety related l essential loops, a nonessential seisaicall.y qualified loop, and a non-essential nonseismic loop.

Each essential loop services the following equipment:

1 A. one emergency diesel generator B. one essential services water chiller C. .two containment fan coolers D. one high pressure safety injection pump and the standby high pressure injection pump (valved into one train only) 2 E. one low pressure safety injection pump

} F. one containment spray pump G. .one shutdown cooling heat exchanger 4

The non-essential seismically qualified loop services the following equipment:

A. one letdown heat exchanger B. one fuel pool heat exchanger 4

C. four reactor coolant pump seals and motor coolers (seismically

. supported) i D. control element drive mechanism (CEDM) coolers (seismically supported)

The nonessential, nonseismic loop services the following equipment:

A. waste gas compressors B. sample coolers C. chemical feed tank D. basic acid and waste concentrators

INSERT B Upon SIAS, the two redundant safety loops vill be automatically isolated from each other by closure of two fail close pneumatic header isolation valves (3CC-F121B, 3CC-F123B) and the nonessential, nonseismically

. qualified loop will be automatically isolated from both by closure of two fail closed pneumatic valves (3CC-F133A/B, 3CC-F152A/B). The CCW pump suction and discharge header isolation valves will also close on SIAS.

The outlet valve on the "A" shutdown heat exchanger (3CC-F130A) remains closed but may be opened manually from the control room, the outlet valve (3CC-F131B) on the "B" shutdown heat exchanger goes full open automatically.

The A loop also continues to provide cooling to the Reactor Coolant Pumps via the nonessential seismically qualified loop.

Upon CSAS, the containment isolation valves (2CC-F146A/B, 2CC-243A/B, 2CC-F147A/B) on the supply and return lines of CCW to the Reactor Coolant Pumps and CEDM coolers are automatically isolated, and the outlet vs1ve (3CC-F130A) on the A shutdown heat exchanger goes full open automatically.

Following isolation, on SIAS, separate CCWS channels are formed, and each supplies cooling water in sufficient quantity and at the required temperature to remove 100 percent of the heat necessary to shutdown the reactor.

WS ES- FSAR-UNIT-3 -

TABLE 9.2-2 o dtp c6 dO b "

CCWS AND ACCWS ltHPENATukE AND FLOW CONTHOL DESCRIPTION I

s $_ N[O 63 % . [8 1

NOkHAL SHUTDOWN ItEFUELING ACCIDLNT NORMAL.

Same as rormal The SIAS automatically closes th*-s ect a ting-velves Fuel Pool Heat The teisperature control valve Same as normal 366-fl+2A-and-We-t*t2D, therbby shut t ing the Exchanger 3CC-FHl38A/8 maintains the fuel CCWS f low t o t t.e fuel pool heat exchanger. The pool cooling water temperature isolation valve will be manually re-opened (*ee leaving the heat exchanger at See64en-hH . -

approximately 108 F.

Same an e as nor T' < ! M c r L ._: ; c c Hy-e le*** -th. i sol at i ng va lves 12 kecctor Coolant Flow through the kCP coolers and 3t'e-el+n , wetts. , m.-r i 2aA aim 3Cc=r:2 rii ,

$lM OtL [ Mg' h S1

[gy ge{d Pump (HCP) the CEDM air cooler is set by Q ']

a +h= d , _t :: b. . CCWS llow tu the reactor manually operated outlet valves; , 4g Mw cu coolant pump cooler ler.

the CCWS llow to each pump is shut- .ggn p l c(-f p., gg -

l g m) c tig geP u oft automatically by a,nlet valves g 3CC-P188Al, -15981, - 190A2, and ,j y  % ,

-19152, wheneve r the pump as not operating; CCWS liow to the CEDM ai g ;g a c pgt @ acC -F p3 cooler can also be shutdown from the main control room by closing hf 2CC-FlW % lid E att&t&. k M d.,b dy 0 gg e

<t

/

W

  1. - T _

the intet valve 3CC-B187A/B.

Same as normal Same as normal The-EIAS-automatica1%y-elones-tlie isolating-valves Letdown tieat The temperature control valve tzchanger 3CC-TH169A/B maintains the s 3CC412 2 AT-3CC-F1236 /~3CC-Fl 20A , and 3CC-F1213', l 31 letdown water temperature / thgeb_y_shnLLing M6e-4dNty-flow-t o-the- let down--hest

. eve 4 anger.

b below 140 F.

?.,

  • The required flow is set by Same as normal Same as normal Same as normal HPSI, LPS1 and Containment Spray manually adjusting the respec-Pumps tive outlet valves.

Same as normal Same as normal The SIAS automatically closes the isolating valves Weste cas Com- The required flow is set by 3CC-F133A/B and 3CC-F132A/B, thereby shutting l33 piensors. Sample manually adjusting the the CCWS tiow to the waste gas compressors Coolers, notic respective outlet valves.

sample coolers, and concentrators. y Acad/Wante and W. ante Concen-trators Outlet valves 3CC-F268A Same am normal Same as normal On loss of of tsite power , the diesel generators l3 osenel Generator start automatically. The starting ut diesel and 3CC-F2698 are closed. generators will autoriatically open the outlet by p.a s s valves are set to y maintain approximately 100 gpm valves 3CC-F26BA and 3CC-F2b9b, to past 800 gpm lT through each diesel generator. through ea.:h diesel generator. The flow in set

$ by manual valves 3CC-527A, -82BA, -83 t h, .ud I

  • -8328.

S e norm 'o= t LOCA, the control valves 3CC-lH14HA and 6' tontaanment Fan unty three conteenment tan g eme_as nor m.n l CC 'lHl495 open tully to permit 2700 gpa thsough Louless coolers ase operating. One tanf q y " . ,

1 gjg,Q g, 3cC-7mj(;QJ] two tan coolers et each channel. -

O cooles = isolated by closing the sont ain+ ut isolatson valven', O .A k E l b O Mp -

)

tenThnud MelaGbk oh ac VMthw H-risisn A Fi IC H -F&M/6 (

a io and i,om o .a pari cniar tan im cmu i re.v tGawned F t uto {}i

=

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ne w whLn ut4h s Cbt (sinaud ikWGin OdNCL Cpn.

\ scac, lab oaMoaf os

. ~

. cDud on SIAS m CI AS.

a'

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WSES- FSAR-UNIT-3 .

TAHLE 9.2-2 (Cont 'd )

~

REFUELING ACCIDENT .

NORMAL NORMAL SHUTDOWN r Containment Fan cocter. The control valves hhhI @ h M ()dD ) QdfL ( ([ y*I Coolers (Cont'd) 3CC-TM148A and 3CC-TM1495 control the CCWS flow through g gg hgC545, *. gb 6DHA Qg [ nKJ vudjC LdU

/UUh d,t,91 't/3 .

the coolers, at 670 gpa for for the channel in which the 4 gt Md I QQ30, 3000<fmi. % Actb Mo isolated cooler is located, g(g g { g ggg gg 7 and 1340 gpa for the other .

P -

Dutlet valves 3CC-F130A Same as normal

^;:!:t --' er M "'?C'. ...J 3cc-Fi3i. vren Shutdown Heat Outlet valves 3CC-F130A e" ' ^- -

  • i a - ' l - *^ p ;. 3GGur p 6nrougn cach Exchanger (SDHK) and 3CC-F1318 are closed

Bypass valves are set to ed fully by operator.

Cn"'- th- i r-* M !: ' h m de%

Opening of the valves e-i'i'-- Wr**,  ; .2 3CJ-aiH6. Tin- u m ;er maintain approximately 100 'h- - r-ki'ity fr^- '" -ri;;- ;;n: rs! c;;

will provide each SOHX irr gpa flow through the SDHX. *^ r--tis!!; : -- A ei n;.. # .;; a ; :e with 3000 gpm controlled by the flow restricting prrdat- ~4' d r~ tire tr - ' ~ 'ha N ^"

orifices 3CC-E296A and th;;;'. ._J. G;= ; 2000 gp .

3CC-K2978. The operator has the (.apability from the main control room to partially close the discharge valves to a e

predetermined position, to reduce the CCWS flow through L each SOHX to 2000 gpe.

O CCWS flow through each chiller Same as normal Same as normal The chiller water supply valves (3CC-F272A, -F2738, Chillers -F274A, -F2755, -F276A -F2778, -F278A, & -F2798) is set at 850 gpe, by manually l3 adjusting valves 3CC-V34A, align automatically when temperature exceeds 105 F i

3CC-V35A/B, and 3CC-V36r. One to supply cooling water to the chillers from the chiller is normally isolated.

ACCWS. The operator has the capability to realign the valves to supply cooling water to the chillers from CCWS when the cold CCWS temperature decreases below 105 F. In this case the CCWS flow to each SOHX must be reduced to 200d gpm to avoid runout of the CCW pump.

in the event that dry cooling The set point for Same as norm.al The set point for the control valves 3CC-TM290A CCW Heat and 3CC-TM29tB automatically read just on receipt of

> Exchanger towers cannot maintain 95 F out- the control valves shutdown l3 SIAS to maintain the CCWS cold temperature at 115 F.

$ let temperature in the CCWS, the 3CC-TM290A and This feature is required to reduce water makeup E ACCW pumps will start and pump 3CC-TM2918 can be cooling water through the CCW adjusted by the opera- requirements to the wet cooling tower post LOCA.

d S heat exchanger; control valves tor from the main con-z 3CC-TM290A and 3CC-TM29tB main- trol room to maintain

. tain the CCWS cold temperature the CCWS cold temp-u at 93 F. erature at H0 F to pt:mit

. faster shutd a.

O 5

TABLE 9.2-5 (Cont'd)

Indication Alarm

  • System Parameter & Location Control Control Function In s t rumen t Local Room High Low Range LPSI Pump
1. Outlet Flov X(CP-8) -

Containment Spray Pump

1. Outlet Flow X(CP-8) -

Boric Acid Concentrator

1. Outlet Flov X( C P-4 ) -

Waste Management Concentrator

1. Outlet Flow X(CP-4) -

Waste Cas Compressors c

un u 1. Oettet Flow X(CP-4) -

E b

" 4:

Letdown Heat Exchanger E'

1. Outlet Pressure 7

X 0-150 psig Q

2. Outlet Flow CP-8 X(CP-8) 0-1400 gpm y Chemical Feed Tank O
1. Outlet Pressure X 0-150 psig CCW Pump
1. Discharge Pressure X 0-150 psig CCW Surge Tank
1. Level X CP-8 X(CP-8) X(CP-8) 1. Control makeup 0-48"
2. Level flow into tank
2. Automatic bypass of dry towers on lo level
9. /sc,i a re CC W TC A / AJ
  • All alarms indicated are in the main control room

. - . r ...-_viL w - -c. ..ez i _ 2 E L L L L - , a . - : :. - . .. .-

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TABl.E 9.3-la .

SAFETY CLAUS VALVES WITH AIR ACCUMULATORS

'D' Valve Tag Figure Valve Tag Figure 9

9 2SI-L101A 6.3-1 2CC-F243A/B 9.2-1

$Si-L102B 6.3-1 2CC-F146A/B 9.2-5 3CC-5201A 9.2-1 2CC-F147A[B 9.2-1 3CC-5203B 9.2-1 2CC-F154A1 9.2-1

, 3CC-B262B 9.2-1 2CC-F155A2 9.2-1 3CC-8265A 9.2-1 2CC-F156B1 9.2-1 ,

9.2-1 2HV-8156A 2CC-F157B2 9.2-1 12 2HV-B1578 9.2-1 2CC-F158A1 9.2-1 2CS-F305A ; , 6.2-35 2CC-F159A2 9.2-1 2CS-F3068 6.3-35 2CC-F160B1 9.2-1 2CC-F16182 9.2-1 3cc FaoA q.1-4 h  % rMI69 A/S 3,1-t 3cc-FPtaTA/6 9.z-t ,

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Question No.

L.s/ 480.44 Table 6.2-32 states that the component cooling water inlet valve (2CC-F146A/B) and outlet valves (2CC-F147A/B and 2CC-F263A/B)

,* for the reactor coolant pumps and CEDM cooler fail open.

Provide the necessary justification this is the " safe" position as opposed to failing closed. ,

Response

These valves are closed automatically on an to ensure that there is sufficient water supply to the essential cooling water systems post-LOCA. Fowever, if off . power is available, the

~

operator may manually override the in order to open these valves and provide cooling water to the Raactor Coolant Pumps (RCP). The valves fail open to ensure that a single active failure will not preclude availability of the RCP's. The fail open position is the safe position for the following reasons:

! 4 ,

Inlet Valves For the post accident period, the valve is positioned by the operator in the safe position. If that position is open, then a failure to the open position is a trivial case. It should also be noted that the RCP's have been tested to demonstrate that they can operate acceptably without component cooling water for thirty minutes (see response to Question 010.15). If the safe

- position is closed, a failure to the open position does not compromise containment isolation because of the check valve.

inside containment. It is therefore, neither necessary nor , 3 desirable for the isolation valve outside containment to fail closed or "as is." .

Return Valves There are two power operated valves, one inside containment and one outside. The inside valve is powered by the SA channel plus a DC redundant source. The outside valve is powered by the SB channel plus a DC redundant source. If the safe position is j '

closed, and a valve should fail open, the other independent valve would remain closed.

The inlet isolation valve and both return isolation valves are each provided with seismically qualified air accumulators to preclude a common mode failure from moving these valves into an undesired position.

Reference See revised Table 6.2-32 (Penetrations 23 and 24).

s.s/ -

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