ML19256A924
| ML19256A924 | |
| Person / Time | |
|---|---|
| Site: | Washington Public Power Supply System |
| Issue date: | 01/02/1979 |
| From: | Cockrell R WASHINGTON PUBLIC POWER SUPPLY SYSTEM |
| To: | Mattson R Office of Nuclear Reactor Regulation |
| References | |
| FOIA-80-587 EDM-RGC-79-02, EDM-RGC-79-2, NUDOCS 7901170134 | |
| Download: ML19256A924 (14) | |
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- M. m A JOINT OPERATING AGENCY S f, % %. usa 5 P O. Box 988 3000 Gao Waswimofom War RicMLamo Waswamorom 993 5 2 P*eom a ( 509 ) 375 5000 January 2,1979 ECM-RGC-79-02 hoM MWy a Dr. R. J. Mattson, Director %> d h4 m" .k Division of Systems Safety U.S. Nuclear Regulatory Commission Washington, D. C. 20555
Subject:
ATdS COST WPPSS NUCLEAR PROJECTS NOS. 1/4
Reference:
Ltr, RJ Mattson to J Ward, "ATWS Cost Estimates",
dated 11-15-78.
Dear Dr. Mattson:
As a result of discussions during the meeting which you held with industry representatives on December 6, we have generated cost estimates for the ATWS fixes described in the reference letter for our Nuclear Projects Nos.1 & 4 (Babcock & Wilcox Pressurized Water Reactors).
As I noted in my December 18, 1978 letter to you concerning ATdS costs for our Nuclear Project No. 2, we consider ATWS to be a licensing issue and not a plant safety issue. Therefore, our response regarding fixes should be interpreted only as providing information and not as an indi-cation of our agreement that these fixes are necessary.
The following listed assumptions were made in preparing the attached cost estimates:
- 1) All costs are in 1978 dollars.
- 2) The modifications occur during a refueling outage rather than prior to initial plant start-up.
- 3) The cost estimates include only direct costs, i .e., design, procure-ment, and installation of equipment, and do not take into account other Owners' costs such as replacement fuel costs, testing and start-up, radiation exposure, etc. These indirect costs in most cases outweigh direct costs.
79011701 M sb- %
fo-DJ[-
R. J. Mattson EDM-RGC-79-02 Page 2 January 2, 1979
- 4) Attachments 1, 2 and 3 consider different possibilities regarding the opportunity to share costs either between our two B&W units or between our plants and similar plants owned by other utilities.
Our willingness to provide the requested information does not indicate an agreement with the need or practicality of any of the suggested bac kfi ts . In face, we disagree with the need to treat ATWS as a real event. However, if required to do so, we believe preventative modifi-cations using a diverse trip system would be the most cost effective.
Should you have any comments or questions, please feel free to call me (509/375-5221).
Very truly yours, 1 ,' .,
e.. !? . ..
R". G. COCKRELL Manager, Engineering RGC:Im Attachments-3
ATTACHMENT 1 ATWS BACKFITTING COSTS FOR WNP-1 RESPONSE TO R. J. MATTSON'S LETTER OF 11/15/78 The following cost estimates are in 1978 dollars and for a. single plant with no cost sharing with other utilities. It was assumed that modifica-tions were accomplished during a refueling outage rather than orior to startup.
Items 1 & 2, Backuo Scram and Diverse Turbine, AFWS and Relief Valve Trios For WNP-1 we have combined the costs of Items 1 and 2 since both changes would use the same input sensors and logic cabinets.
The Supply System believes that there is no justification for imposing IEEE-279 on these suggested systems. The primary function of these backup trip systems is to orovide diversity, not redundancy. WNP-1/4 are oro-tected by a fully qualified and redundant reactor protection system. -
The backup trip systems are only being considered because of an alleged need to provide additional protection against common-mode failures in the scram systems.
Not only does the Supply System believe that imposition of IEEE-279 is unjustified, but we also believe that it may limit the diversity that can be obtained in the system by limiting the selection of comoonent parts.
Finally, we note that imposition of IEEE-279 goes beyond NUREG-0460 which left the design to the applicant and allowed for analysis justifying a non-IEEE-279 system.
Notwithstanding the above discussion we have provided the cost of an IEEE-279-71 backup trip system. However, we have also taken the liberty to include the cost of a non-IEEE-279 system.
2 IEEE-279 Backuo Trio System Dollar Cost Design S 50,000 - 5 100,000 NSSS supplied equipment 250,000 - 500,000 (4 sensors, 2 logic cabinets w/bistables, etc, 4 CRDCS trip breakers)
Qualification 150,000 - 300,000 Electrical installation 45,000 (cable, terminations, 4 equioment pads, breaker cabinets, EPSS modi-fication, engineering, contract administration) .
I&C installation 7,800 (inst. racks, tubing, engineering design, field fab and installation)
Craft HP and security training 9,000 Total Direct Costs S511,800 - S 961,800 Sales Tax 27,000 50,000 Financing 38,000 71,000 Total Costs $576,800 - $1,082,800 tian-rem Exoosure About 1. man-rem Extension of Normal Refuelino Outace None; should be accomplished during normal outage.
3 Non-IEEE-279 Backuo Trio System Dollar Cost Design 530,000 - S 60,000 NSSS supplied equioment 60,000 - 120,000 (4 sensors, 2 logic cabinets w/bistables,etc.)
. Electrical installation 30,000 (cable, terminations, 2 equipment pads, EPSS modification, engineering, contract administration)
I&C installation 7,800 (inst. racks, tubing, engineering design, field fab and installation)
Craft HP and security training 9,000 Total Direct Costs $136,800 - 5226,800 Sales Tax 7,000 - 12,000 Financing 10,000 - 17,000 Total Costs $153,800 - $255,800 Man-rem Exoosure About 1. man-rem Extension of Normal Refueling Outage None; should be accomplished during normal outage Items 3-6, BWR's Only Item 7, Functionability of RCS Boundary Valves for Table 7 Pressures Item 7 references prescription 5 of Table 7 of Appendix VII to NUREG-0460 for the peak pressure. For B&W plants this oressure is 3097 psi. The reactor coolant system will be hydrotested to 3125 psi. Therefore, there should be no dollar cost, man-rem exposure or extension of a normal refueling outage associated with Item 7. .
It is our understanding that the intent of Item 7 was to assess the adecuacy of the boundary valves for an ATHS event without additional relief cacacity. Table 7, however, is based uoan larger relief capacity (ref. p VII-8 of MUREG-0460). We are providing the following costs for evaluating the adequacy of the RCPB for ATWS events without addi-tional relief capacity.
4 The estimates are based upon qualification of the RCPB to 3500-3750 psi:
Dollar Cost Functional analysis to determine pressure 5 10,000 - 5 30,000 Qualify heavy section RCS components but not the RCP 50,000 Qualify RCP 40,000 - 300,000 20,000 - 100,000 Qualify 6 B&W 1.e., 4 HPI supplied valves boundary (V43A) va{ves
- (V43D)_/
2 DHR letdown valves (V-12A) and (V-128)2/
Qualify 4 owner suoplied boundary check valves, i.e., CFL check valves 50,000 V35-A and V36-B, and LPI check valves V75-A and V76-B3/
Total Direct Cost 5170,000 - S480,000 Sales Tax 8,300 - 25,000 Financing 12,500 - 35,000 Total Cost $191,300 - $540,000 Iten 8, Functionability of RCS Boundary Valves for Level C Stresses Item 8 would be covered by the analysis performed for Item 7. If Item 7 analysis were not performed an Item 8 analysis might be cheaper than Itsn 7 because of the lower pressure transient but maybe not.
Item 9, Reclace Valves for which Functionability Cannot be Demonsti .cao The Supply System believes that there is no justification for specifyir.1 valves of a higher pressure rating for plants such as WNP-1/4 for which the valves have already been fabricated. Nonetheless, the following estimates are provided:
1/ See WNP-1/4 PSAR Figure 3.2-3 2/ See WNP-1/4 PSAR Figure 3.2-4 3/ See WNP-1/4 PSAR Figure 3.2-3 except V75-A and V76-B are not labeled.
5 Dollar Cost Procure replacement ilSSS vendor supolied 5250,000 - 5500,000 valves (i.e. , 4 HPI and 2 OHR valves of Iten 7)
Procure replacement owner sucolied 180,000 c.5eck valves (i.e. , 2 CFL and 2 LPI valves of iten 7)
Replace above listed valves (i.e. , cutout valve, weld prep, installation, welding, dye penetrant and radiograph) 4 HPI valves 13,000 2 DHR letdown valves 39,000 4 check valves (CFL and LPI) 74,000 RCS hydrotest 20,000 Craft HP and security training 5,000 Total Direct Cost 5581,000 - 5331,000 Sales Tax 30,000 - 43,000 Financing 43,000 - 61,000 Total Costs $654,000 - $935,000 fian-rem Exposure Job Men Days mr/hr Man-rem 3/ valve 2/ valve 10. 6.
V43's (4)37 4/ valve 100. 58.
V12's (2)-- 3/ valve V35-A, V36-8, V75-A, V76-8 3/ valve 3/ valve 100. 86.
defuel d/ 7 15 50. 126.
hydro 5.
281.
281.x .755/ = 210. man-rem 4/ Replacement of valves V-12A and V-128 wou'o recuire a complete fuel unloading and draining of the RCS. The system hydro also requires complete fuel unloading.
5/ A factor of 0.75 has been acolied to account for the fact that personnel are not at the component full time, e
6 Extension of nomal refuelina octaae Complete defueling 15 days b Valve replacement 8 daysb RCS hydrotest 5 days 28 days Item 10, Add Three Safety Relief Valves The following estimate is based upon the addition of three 6x8 inch relief valves to the pressurizer surge line. We do not believe it is practical to add the valves directly to an installed pressurizer.
Dollar Cost Analysis to determine relief valve, route requirement 5 20,000 Reanalysis of surge line 50,000 Procure 3 valves 400,000
-Cutin three 6x8 inch relief valves , route 192,450 discharges to a common header, route 14 inch blowdown line through existing floor penetration to RCDT, QA, design, analysis and hydro-test Breakdown Shop fab 4 spools S 48,100 Complete and radiograph 11 field welds 72,350 Add nozzle to RCDT 4,500 Pipe supports 22,500 Design sparger 1,500 Sparger seismic & code analysis 3,500 Fab & install sparger 10,000 RCS hydrotest 20,000 Procurement 10.000
$192,450 Craft HP and security training 6,000 Total Direct Cost $668,450 Sales Tax 34,800 Financing 49,000 Total Costs $752,250
7 Man-rem Exposure Job Men Days mr/hr Man-rem
/
defuel 7 15 50. 126.
add relief valves 4 10 100. 96.
RCS hydrotest 5.
222. x .75 = 167. man-rem Extension of Normal Refueling Outace Complete defueling 7_/ 15 days Add relief valves8,/ 10 days RCS hydrotest 5 days 30 days 6/ During the time replacement of the V12's is being acccmplished -
and the RCS is drained, no other critical path refueling outage work can be accomplished.
7/ The need to hydro the RCS requires a complete fuel unloading.
8f During the time the relief valves are being added and the RCS is drained no other critical path refueling outage work can be accomolished.
Item 11-13 BWR's only
ATTACHMENT 2 ATWS BACKFITTING COSTS FOR WNP-4 RESPONSE TO RJ MATTSON'S LETTER OF 11/15/78 provided the ATWS backfitting costs assuming WNP-1 (or WNP-4) paid all the one time costs. This attachment lists the costs of completing the backfitting for the second WPPSS B&W unit. The esti-mates of man-rem exposure and extension of a normal refueling outage are the same as Attachment 1 and are not repeated here.
Items 1 and 2, Backuo Scram and Diverse Turbine, AFWS and Relief Valve Trios IEEE-279 Backuo Trio System Design 0 NSSS supplied equipment 250,000 - 500,000 Qualification 0 Electrical installation 40,000 I&C installation 7,800 Craf t HP and security training 9,000 Total Direct Cost $306,800 - $556,800 Sales Tax 16,000 29,000 Financing 23,000 41,000 Total Costs $345,800 - 5626,800 Non-IEEE-279 Backuo Trio System Design 0 HSSS supplied equipment 60,000 - 120,000 Electrical installation 25,000 I&C installation 7,800 Craft HP and security training 9,000 Total Direct Cost 5101,800 - $161,800 Sales Tax 5,300 8,400 Financing 7,500 12,000 Total Cost $114,600 - 5182,200
2 Items 3-6, BWR's only Item 7, Functionability of RCS Boundary Valves for Table 7 Pressures There should be no Item 7 costs for the second unit.
Item 8, Functionability of RCS Boundary Valves for Level C Stresses There should be no Item 8 costs for the second unit.
Item 9, Reolace Valves for which Functionability Cannot be Demonstrated All of the Item 9 costs of Attachment I would be receated for the second unit. Therefore, the total remains $654,000 - $935,000.
Item 10, Add Three Safety Relief Valves Analysis to determine relief valve requirement 0 Reanalysis of surge line 0 Procure 3 valves 400,000 Cutin 3 6x8 inch relief valves 187,450 Craft HP and security training 6,000 Total Direct Cost 5593,450 Sales Tax 31,000 Financing 44,000 Total Cost $668,450
ATTACHMENT 3 ATUS BACKFITTING COSTS FOR WNP-1/4 RESPONSE TO RJ MATTSON'S LETTER OF 11/15/78 Attachment 2 provided the ATWS backfitting costs assuming WNP-1 (or WNP-4) had already paid the initial, onetime costs. This attachment assumes a three way split of some onetime design, analysis and quali-fication costs between one Supply System B&W unit and two other utilities.
As in Attachment 2, the estimates of man-rem exposure and extension of a refueling outage of Attachment 1 are not repeated here.
Items 1 and 2. Backup Scram and Diverse Turbine, AFWS and Relief Valve Trios IEEE-279 Backuo Trio System Design $ 16,700 - S 33,000 NSSS supplied equipment 250,000 - 500,000 Qualification 50,000 - 100,000 Electrical installation 45,000 I&C installation 7,800 Craft HP and security training 9,000 Total Direct Cost $378,500 - 5694,800 Sales Tax 20,000 36,000 Financing 28,000 51,000 Total Cost $426,500 - $781,800 Non-IEEE-279 Backuo Trio System Design $ 10,000 - S 20,000 NSSS supplied equipment 60,000 - 120,000 Electrical installation 30,000 I&C installation 7,800 Craft HP and security training 9,000 Total Direct Cost $116,800 - $186,800 Sales Tax 6,000 9,700 Financing 8,600 14,000 Total Cost $131,400 - S210,500
2 Items 3-6, BWR's Only Item 7, Functionability of .RCS Boundary Valves for Table 7 Pressures Functional analysis to determine pressure 5 3,300 - 5 10,000 Qualify heavy section RCS comoonents but not the RCP 16,700 Qualify RCP 18,900 - 100,000*
Qualify 6 B&W supplied boundary 33,000*
valves 6,700 -
Qualify 4 owner supplied check valves 50,000 Total Direct Cost 595,600 - 5209,700 Sales Tax 5,000 11,000 Financing 7,000 16,000 Total Cast 5107,600 - 5236,700 Item 8, Functionability of RCS Boundary Valves for Level C Stresses The note of Attachment 1 apolies here.
Item 9, Replace Valves for which Functionability Cannot be Demonstrated The Item 9 costs cannot be shared with other utilities. Therefore the total remains 5581,000 - 5831,000.
"The cost splits for the RCP and boundary valves are somewhat uncertain because the B&W 205 plants have different RCP and valve manufactures.
3 Item 10, Add Three Safety Relief Valves Analysis to determine relief valve requirerent S 6,700 Reanalysis of surge line 50,000*
Procure 3 valves 400,000 Cutin 3 relief valves 192,450 Craft HP and security training 6,000 Total Direct Cost 5655,150 Sales Tax 34,000 Financing 48,200 Tctal Costs 5737,350
- There is the potential for some cost sharing on the surge line analysis but it would not be great and has not been included here.