ML17272A238

Forwards ATWS Cost Estimaters.Views ATWS as Licensing,Not Plant Safety Issue

ML17272A238
Person / Time
Site:	Columbia
Issue date:	12/18/1978
From:	Cockrell R WASHINGTON PUBLIC POWER SUPPLY SYSTEM
To:	Mattson R Office of Nuclear Reactor Regulation
References
FOIA-80-587 EDM-RGC-78-356, NUDOCS 7901160102
Download: ML17272A238 (16)

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Washington Public Power Supply'System A JOINT OPERATING AGENCY d~4 P. O. BOX 958 3000 GCO. WACHINCTON WAT RICHI.AND, WASHINCTON 99352 PHONC (509) 375 5000

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December 18, 1978 EDM-RGC-78-356 Dr. R. J. Mattson, Director Division of Systems Safety U. S. Nuclear Regulatory Commission Washington D. C. 20555

Subject:

ATWS COST ESTIMATES-WPPSS NUCLEAR PROJECT NO. 2

Dear Dr. Mattson:

I and members of my staff appreciated the opportunity to meet with you and your staff in conjunc'tion with other industry representatives on December 6 to discuss ATWS cost estimates. We are of the opinion that the exchange was very beneficial and provided a better understanding of the impact of various ATWS fixes for all concerned.

As a result of our involvement in the ATWS issue over the past several months, we have developed the attached cost estimates for various levels of system modifications to accommodate an ATWS event. As we noted in our presentation to the ACRS Subcommittee on ATWS in October, we consider ATWS to be a Licensing issue and not a plant safety concern.

The attached cost estimates are based on our interpretation of what may be requested by the staff. to satisfy your concerns regarding ATWS. The levels we have addressed include the 13 items contained in your November 15 letter to the Atomic Industrial Forum (Mr. John Ward, Chairman, Committee on Reactor Licensing and Safety). We have not independently addressed each item of your letter, but have instead attempted to incorporate them into systems which cover a spectrum of fixes ranging from justification of the existing design to an ultra-conservative mitigation system per NUREG-0460. All assumptions, definitions and the overall bases for cost estimates are included in the attachment.

Should you desire further information regarding our cost estimating methods, we would be pleased to discuss the subject with you, or to cooperate with the AIF in preparing an industry presentation on cost estimating methods.

7901160102

Dr. R. J. Mattson December 18, 1978 EDM-RGC-78-356 Page Two We trust that the attached information will be of use to you in evalu-ating the costs of ATWS. Should you have any questions regarding our transmittal, please contact me.

Very truly yours, R. G. COCKRELL Manager, Engineering Division RGC:GCS:ct Attachment cc: John Ward, Chairman, AIF Committee on Reactor Licensing and Safety L. S. Sandlin, WPPSS, Manager Project Planning and Measurement

ATMS COST ESTIMATE FOR MiRP-2 This document summarizes the cos imoact for five levels of fixes

=or ATMS if applied to MPPSS Nuc;ear Projec Ho. 2. Basic assumptions relating to the ATMS'fixes are '.dentified alorg with an out',ine of the

-:ve levels wh:ch provide the basis -:or the cost estimate.

The five levels outlined def":ne a spec.rum of arbitrary and possible fixes ranging from justifying exist".'rg designs to an ultra-conservative'it'.ga

'.on sys"em design per NUREG-0460. The outl";ne ':n no way '.mplies thai. what is '.nc'.ucted in each ~evel provides an opt",mum level of f-;x, or that the fix is necessary, i.e., the levels are frameworks from which to illus-trate potential costs and schedule impacts ,or the Mf(P-2 plant.

The costs provided are to .al costs which MPPSS estimates would incur for the various levels. The total est'.mated cost for each level is divided into two categor'"'.es - direct cos-;s and ot;ier cost . Oirect costs include materials, insta'lation and A/E enginee. ina to ins estimates not detailed con truciion estimates.

all each fix. They are engineering General Electr c's costs for materials and front-end engineer ng for each level of fix is included in the direct costs as materia,'s".

The other incremental costs include the following:

e Construction Management (unique to MHP-2) o Owner'.s Cost (startup and testing, safety and licensing, engineering, project management, quality assur ance, insurance, proper y taxes) o Contingency (on direct cost, construction management, owner's cost) o Escalation (on d:rec. cost, construction management, contingency) o Sales Tax (direct cost, escalation, contingency, cons ruction.

managemen-)

s Financing and .'nterest During Construction The total estimated cost does not nclude any costs associated with fuel, delay or replacement power, operation and ma.'ntenance, or system cleanup costs due to inadvertent trps of au omated s.andby liquid control systems.

A cost matrix is included to show where thirteen specific NRC items related to ATMS f'.xes are included ':n each level. The specified NRC items.

are listed in the attachment to the november 15, 1978 letter from R. J. Hattson {NRC) to 3. Mard (ALF).

KDC 12/'i2/73

Basic Assumptions for ATMS Fixes

1. No other system failure other than the one causing ATWS for levels through 4. However, the initia.ing event may be a loss of offsite power.

2. A two minute opera. or act'.on t;:me is used to manually start SLC pumps for level 3.

3. Metweli temperatur 0

e limitations are not exceeded for all levels.

4. <~ax.'mum water temperature for proven quencher operation is not exceeded, i.e., no quencher test costs or levated temperatures or all levels.

Compl:ance with NUREG-0460, which assumes AT'AS is a design basis acciden , requires the m":.tigation system to be safety grade-single failure p. oof, C":as LE power for level 5b.

6. The circuitry required for initiating ATMS fixes from Level 2 through 4, inclusive, are designed with the same reliability as the mechanical port on of the SLC system !.e., not single-fa",ure proof.:

7. Compliance with NUREG-0460 (Level 5) requires the additional assumotions of a) failure of HPCS and b) 101 of NSRV failing to close. Level 5a assumes that analyses will show the 300 gpm Automatic Boron Iniection System wil". mitigate the consequences of both of the above assumptions . ~

evel 5b assumes that the 300 gpm AB1 may not mitigate "he consequ nces of these two ultra-conservative assumptions.

MNP-2 LEVEL OEFINITIONS Level 1: Justify Existing gesign

'a ~ Tighter operational limits on the condensate storage tank to allow for more than '.35,000 gallons minimum for RCIC/HPCS usage.

b. Some additional contro'. room information (e.g. alarms)

C. Engineering ana',ysis Level 2: Imoroved Control - Alternate Reactor Shutdown System (ARSS)

a. Two additional reactor low level and two additional reactor high pressure sensors o the same auality as those used for the Reactor Protection Sys".em (RPS) but independent of RPS.

The additional -:.nst: umentat-:.on vill ! initiate a Recirculation Pump Trip (RPT) using a one out o", trio Niice logic. The RPT

';=- equivalent to the Mon ;:cello design.

C. ALAS Rod Insertion (ARI) wi":1 be initiated by the above circuitry to vent the a.'r scram heade! using two additional solenoid valves.

ARI is qualif':ed to rEEE-279, i971 .

Level 3: Level 2 P'.us Mitigation (Manual 86 gpm SLC)

a. ARSS with Monticello RPT

b. Two existing 43 gpm SLC pumps with a second suction line from the SLC tank and a second injection point (jet pump instrumen-tation 1.:ne) added. The SLG pumps will automatically provided be with power from the emergency d"diesel after a loss of offsite power. Switch will be changed to allow both pumps to start s multaneously.

C. Revision of procedures and training of operators for manual initiation of SLC pumps.

d. Feedwater pump trip initiated by ARSS.

Level 4: Level 2 Plus Mit"gation (Automatic 86 gpm SLC) a 0 ARSS wi th Monticel'.o RPT Two existing 43 gpm SLC pumps with a second suction line from

he SLC tank and a second inject:on po nt (jet pump instru-mentation line) added. The pumos will be automatically started by ARSS circ 'itry.

C. -eedwater oump tr'.p initiated by ARSS.

d. RCIC/HPCS initiated by ARSS.

e. Analysis for modi f'cation o, low level and low pr essure MSIV set points.

Level 5a: Mitigation System - 300 gpm Automatic Boron Injection (ABI) System

a. Four addit:onal reactor low level and four additional high pressure sensors to orovice two redundant trains of auto-matic ',og'.c and satisfy NVREG-0460 criteria.

A RPT corno'lying with crit"ria of tel R~G-0460 will require additional trip coils to trip;OC breakers, wh'.ch i(ill cut power from both normal powe. supply and the low frequency mo-or generators.

c ~ Four 150 gpm SLC pumps, 300 gpm per train, each pumo w th seoara .e suction l.ine from Si C tank. The second injection po'nt (HPCS ',ine) will be as close to the reactor vessel as Oosslb~e.

d. ~eedwater pump f'p initiated by ASS circuitry.

e. HPCSfRCIC initiate~ by A;~iS circu. ry.

f. ARilS 'Rod Inse&";on qualif',ed to IEE>>:-279, 1971 and initiated by ASS c.'rcuf try.

Level 5b: Level 5a with Additional High Pressure Makeup and Heat Sink a ~ Level Sa Soecial ATMS Makeup (SAM) equivalent to HPCS C. Suppression Poo'i Interim Cooling (SPIC) equivalent to additional RHR system along with heat sink.

d. Qiesel generators to supply emergency power for ABI, SAM, and SPIC.

ATv!S Cost Matrix The following table identifies where, by means of an (x), the cost of each NRC item is llsed in costing GU each cf the five levels of, ixes for ATMS.

NRC A&iS F',xes (2)

Items Level 2 Level 3 Level 4 Level 5 1

2 NA HA NA 3

5 6

NA NA NA NA NA 8 NA NA NA NA 9 NA NA NA NA 10 NA NA NA NA 11 12 13 (1) NRC items refers to the Items in the attachment to letter from R. J. 4!attson (HRC) to J. Mard (A';"-), dated November 15, 1978.

(2) The five levels of ASS ixes are outlined on the attached sheets.

ATWS Cost/Schedule Summar Level Oesian, Procure 5 Install Total Estimated Cost 7-10 months 0.5M 9-12 months 1 .3M 9 12 mont S 2.5M 18-24 months 5 4.0M 36-42 mon hs S 29.4M

• 5b 42-~8 months )150M

~Note e Ho delay/downtime costs included for all of the above.

o "No delay/downtime costs included, however, instal'.ation costs assume installation is after lant startuo.

o All assume fix is applied to an as-built (or operating) plant.

e No operation/maintenance costs included for any of the above.

o iso costs included .or system cleanup due to inadvert nt trips of Automatic Standby Liquid Control Systems.

ASS MNP-2 Level 1 Surmarv FPC Code Totals 10 Structures and Improvements S 20 Peactor Plant Equipment 0 Turbo-Generator Units 40 Accessory Electrical Equipment 55,000 50 Misc. Power Plant Equipmen" 45,000 60 Station Equipment and Switchyard 70 Distributable Directs A/E Engineering Design 60,000 Total Direct Cost 160,000 Construction Management A/E Portion 56,000 Owner Portion 50,000 Owner's Cost 40,000 Contingency 122,300 Escalation 18,800 Sales Tax 23,200 Financing and Interest During Construction 17,400 Total Estimated Cost 487,700 Excludes Fuel Costs 8 Replacement Power Excludes Opera ion and Maintenance Costs

ASS MNP-2 Level 2

~Soaaa:r FPC Code Totals 10 Structures and Improvements $ 20 Reactor Plant Equipment 50,000 30 :urbo-Generator L~nits ~TO Accessory E',ectrica'quipment 250,000 50 Risc. Power Plant Equipment 60 Station Equipmen and Swtchyard 0 70 Oistributable Oirects A/E Engineering Design 180,000 Total Direct Costs 480,000 Construction management A/E Portion 100,000 Owner Portion 90,000 Owner's Cost 70,000 .

Contingency 296,000 Escalation 68,000 Sales Tax 57,<00 Financ".'ng and Interest During Construction 67,100 Total Est",'mated Cost 1,228,500 Excludes Fuel Costs and Replacement Power Excludes Operation and Maintenance Costs ASS MNP-2 Level 3 SL'HOARY FPC Code Tota Is 10 Structures 5 Improvements S 20 Peactor Plant Equipment 350,000 30 Turbo-Generator L~nits 40 Accessory Electrical ~quipment 250,000 50 Misc. Power Plan . Equipment 60 Sta+":on Lquipmen". Switc,",yard 0 70 Ois:r- butab!e 0'.rects A 8 "= .ngineer',ng Oesfcn 360,000 Total 0 rect Cost 960,000 Construction Management A 5 E Por+ion 200,000 Owner Port-Ion 180,000 Owner Cost 135,000 Contingency 590,000 Esca!at.'on 150 100 Sa!es Tax ~ '00 Financing 8 Interest Ourino Construction 14S,700 Total Estimated Cos. 2, a<78,900 Excludes Fuel Cos s 5 Reol acement Power

=xcludes Operation 5 bia'ntenance Costs ATMS MNP-2

'v ~ 4" SUf~iARY FPC Code TOTALS 10 Structures & Improvements $ -0 20 Reac or Plan+ Equipment 400,000 30 ,urbo-Generator Limni .s 40 Accessory E',ec+rical Equipment 600,000 50 Risc. Power Plane Equioment 60 Shat",'on Equipment & Sw tchyard 70 Ois.r." utable Oirects A & E Engineering 600,000 Tota'. Oirect Cost 1,600,000 Construction Management A & E Portion 300,000 Owner Portion 270,000 Owners 200,000 Cos+'ontingency 940,000 Escalation 242,400 Sales Tax '.84,700 Financing & Interest During Construction 2<0,100

,otal Estimated Cost 3,977,000 Excludes Fuel Costs & Replacement Power Excludes Goer ation & Maintenance Costs

• Scheduled Shutdown After Fuel Loading ATMS uNP-2 "Level 5a.

SOY>lARY FPC Code TOTALS 10 Structures 5 Imorovements S 40,000 20 Reactor Plant Equ.pment 3,000,000 30 Turbo-Generator Units 40 Accessory Electrica: Eouipment 3,400,000 50 Misc. Power P'.ant Equipment 60,000 60 Station Equipment 5 Switchyard 70 Oistributable Oirects A u' Eng',neering Des.'gn 3 000 000 Total Oirec Cos 9,500,000 Construction Management A 8 E Portion 2,400,000 Owner Por;i or, 2,160,000 Owner Cost 1,600,000 Contingency 6,265;000 Escalation 4,222,000 Sales ax 1,357,000 F',nancing 8 Interest During Construction 1,837,000 Total Es mated Cost 29,34',000 Excludes Fuel Costs 5 Replacement Power Excludes Ooeration 8 iNaintenance Costs

• Scheduled Snut"own after Fuel Loading ATMS 'ANP-2

~ ove'b*

SUl<l <ARY TOTALS 10 Structures 8 Improvements $ 7,345,000 20 Reactor Plant Equipment 30,000,000 30 Turbo.-Generator L'ni ts Accessory E".ectr.'cal Equipment 1,423,00Q Misc. Powe. Plant Equipment 235,000 Station Equipment A Switchyard Oistributable Oirects A 8 E Eng'neering '3esign 13,100,000 Total 0";rect Cos- 52,103,000 Construction Management

"= Portion A ~~

g,800,000 Owners Portion 8,820,000 Owners Cost 5,410,000 Contingency 30,440,000 Escalation 25,000,000 Sales Tax 6,826,00Q Financing 8 Interest during Construction '.1,75o,000 Total Es imated Cost 150,155,000 Excludes Fuel Costs 8 Repl acement Power Excludes Operation 5 Maintenance Costs

• Scheduled Shutdown after Fuel Loading KQC 12/12/78

• U. S. GOVERNMENT PRINTING OFFICEI l97~0.978

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DATE OF OOCUMENT OATE RECEIVED R.G. Cockrell, Mgr.

Engineering Division 12/18/78 12/26/78REPORT'SS:131 Wash. Pub. Power Supply Sys. LTR MEMO: OTHER TO ORIG CC:

Roger J. Mattson, Director OTHER.'CTION Division of Systems Safety NECESSARY (g CONCURRENCE P CATE ANSWEREO ONRR NO ACTION NFCESSARY Q COMMENT 0 SYI 1/10/79 CLASSIF REG, NO.'ILE POST OFFICE CODE ATWS WPPSS No. 2 OESCRIPTION, IMuu SF UnCIFHdieaI REFERREO TO GATE RECEIVEO EY GATE ATWS Cost Estimates- D. Bunch WPPSS Nuc. Project No. 2 ENCLOSURES'istributed to: R. Fraley, ACRS (21)

E. Case P. Boehnert, ACR R. Mattson T. Novak V. Stello R. Tedesco Schroeder A. Thadani REMARKS to Ann Haikalis.'.

Return original yellow ticket and copy of incoming w/copy of reply S. Hanauer M. Ernst B.J.Youngblood RSB Centra File NRC PDR Docket F le U. S. NUCLEAR REGULATORY COMMISSION MAIL CONTROL FORM 79ox ~6o ~o2