ML20210S883

Summary of 750612 Meeting W/Util & Ebasco in Bethesda,Md Re Proposed Groundwater Drainage Sys Design & LOCA Dose Calculations.Staff Concern Re Failure of Tank Containing Radioactive Liquid Expressed.Attendee List Encl

ML20210S883
Person / Time
Site:	Satsop
Issue date:	07/03/1975
From:	Oreilly P Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
CON-WNP-1695 NUDOCS 8605290481
Download: ML20210S883 (4)

Text

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.4 jut. O i 1975 DX KET NOS. STN 50-503 AND STN 50-509 APPLICANT: Washington Public Power Supply System FACILITY: WPPSS Nuclear Projects No. 3 and No. 5 SUWERY Or JUNE 12,1975 HEETING REGARDING GROUNDWATER DRAINAGE SYSTEM AND LOCA DOSE CALCULATIONS On June 12, 1975, representatives of WPPSS and Ebasco met with tne NRC staff in Bethesda. The purposes of the meeting were (1) to discuss the proposed groundwater drainage systen design and (2) to discuss the LOCA dose calculations. A list of attendees is attached.

We stated our concern tnat the failure of a tank containing radioactive liquid could possibly result in the spill entering the groundwater drainage system. Since the present system design provides ninic.al holdup and dilution, doses in excess of 10 CFR Part 20 limits could be encountered by surface water users along Workman Creek.

WPPSS sumarized the features of the proposed groundwater drainage system design. Ebasco then presented a discussion of crack forcation and propagation in concrete. They briefly described the study that they had made concerning possible mechanisms for cracking in the foundation mat or walls of the Category I structure. This study indicated that the only type of cracking that might be expected to occur is through-wall cracks in the concrete due to a change in volume caused by temperature.

The concrete cracking analysis used the following assumptions:

(1) The cracks 90 all the way through.

(2) The cracks are straight and smooth.

(3) The cracks are ten feet high.

(4) The cracks do not heal.

(5) No Poissons ratio effect was considered for normal operating conditions.

(6) Radioactive liquid waste storage tank failure will occur during a shutdown of a prolonged period. This results in a higher 4 average concrete tenperature than would be observed normally.

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JtlL 0 31375 2-(7) The rock provides no pressure against the wall of the Category I structure.

(8) All of the liquid spill gets into the drainage system.

(9) Creep of the concrete is ignored.

Using these assumptions Ebasco calculated a leak of 50 gallons per day. At thi.s leak rate, Ebasco calculated that there would be no dose incurred by a surface water usere The dose calculations assumed no flow in the groundwater drainage system and no dilution. Tha limiting case as well as possible modifications to the drainage systen design were discussed.

WPPSS stated that the discussions would be documented by PSAR ar.endment in a tinely nanner. We agreed to review the submittal and inform WPPSS of our evaluation upon its completion.

We informed WPPSS that the informtion about tne containment spray system provided in the PSAP was inadequate for the purpose of evaluating the ability of the system to recove iodine in post-LOCA radiological dase calculations.

The assunntions WPPSS used in the post-LOCA dose calculations were discussed.

Original Signed by Patrick D. O'Reilly Patrick D. O'Refily Light Water Reactors Project Branch 1-3 Division of Reactor Licensing Attach::ent:

Attendance list 1

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JUL 0 3 GIS ATTACHMENT ATTENDANCE LIST HEETING WITH WASHINGTON PUBLIC POWER SUPPLY SYSTEM JUNE 12,1975 WPPSS - E8ASCO -

D. B. Whitford J. Franco G. Sorensen T. Donaher W. D. Razak R. T. Vickers A. Barchas J. S. Teraszkiewicz i

NRC - STAFF P. D. O'Reilly T. L. Johnson W. S. Divins T. H. Cox D. L. Tibbitts P. G. Stoddart R. J. Stuart i

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k Distribution:

Docket File S. Varga NRC PDR R. W. Klecker Local PDR F. Schroeder NRR Reading (M. Groff) R. Tedesco thR l-3 File V. Stello R. C. DeYoung R. Maccary V. A. Moore H. Denton D. Skovholt V. Benaroya D. Miller G. Iainas R. Denise J. Collins K. Goller D. Ross W. Butler T. Ippolito J. Stolz J. Knight R. Clark S. Pawlicki T. Speis L. Shao D. Vassallo B. Grimes K. Kniel W. Gamill

0. Parr R. Ballard A. Schwencer P. Fine R. Purple T. Novak D. Ziemann M. Spangler P. Collins J. Kastner G. Knighton EP Project Manager - J. Norris G. Dicker Project Manager - P. D. O'Reilly B. Youngblood Attorney, EID W. H. Regan, Jr. IE (3)

R. Vollmer V. H. Wilson W. Houston ACRS (14)

G. Lear V. Goel F. Kantor C. Stepp T. Johnson D. Budge r J. Greeves R. Kornasiewicz i T. Murphy P. Stoddart C. Liang F. Cherney J. Costello E. Brooks P. Chen G. Manz R. Satterfield k. Bolotsky F. Ashe L. Dhillips l-I. Sihweil W. 5. Bivins R. Culp T. H. Cox D. L. Tibbitts R. J. Stuart i

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