ML19326C921

Forwards Tech Spec Change Request Re ETS 4.1.2a(3),deleting Discharge Canal Sampling.Util Position on Deletion of Sampling Discussed.Timely Review of Proposed ETS Change Requested to Facilitate Implementing Program in Apr 1976

ML19326C921
Person / Time
Site:	Arkansas Nuclear
Issue date:	12/12/1975
From:	Phillips J ARKANSAS POWER & LIGHT CO.
To:	Youngblood B Office of Nuclear Reactor Regulation
Shared Package
ML19326C922	List: ML19326C921 ML19326C930
References
NUDOCS 8004290555
Download: ML19326C921 (3)

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NRC D. iRIBUTION FOR PART 50 DOCKEl . ATERI AL

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CONTROL NO: 13902 e  : . FILE: Fnvirnnmental FROM'. Arkansas Power & Light Co . DATE OF DOC DATE REC'D LTR TWX RPT OTHER Little Rock, Arkansas J.D. Phillips 12-12-75 12-15-75 XXX TO: . ORIG CC OTHER SENT NRC PDR XXX B.J. Youngblood 1 Sig'ned- 38 SENT LOCAL PDR CLASS UNCLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:

XXX 39 50-313 DESCRIPTION: ENCLOSURES:

Proposed Amdt. to 0L/ Change to Environmental Tech. Specs. Consisting of revisions to -

Appendix B. With regards to' delete sampling THIS DOCljMENT CONTAINS.

in the discharge canal for determination of mortali ty of ichthyoplankton. . . . . . . P00R QUAL.lTY PAGES.#

(39 Cys. Received) .

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ARK ANS AS POWER S LIGHT COMPANY DTH E LOU.S.AN A ST A..TB . LITTL. AOCK. A AK ANSAS 72203 .(501) 371 4000 December 12 @).1, '- ,

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Director of Nuclear Reactor Regulation \ ,:2 s-ATTN: Mr. B. J. YoungSlood, Chief 'G? . _. -f " V , a ...g.-

Environmental Projects Branch # 3Q@/ ,'

U. S. Nucicar Regulatory Commission \'g i'.

Washington, D. C. 20555

Subject:

Arkansas Power G Light Company Arkansas Nuclear One-Unit 1 Docket No. 50-313 License No. DPR-51 Environmental Technical Speci-fication Change Request Ref: 1. Marcy, B. C., Jr. , " Survival of Young Fish in the Discharge Canal of a Nuclear Power Plant."

' Journal of'the Fisheries Research Board of Canada, 28, 1057, (1971).

2. Marcy, :B. C., Jr. , " Vulnerability and Survival of Young Connecticut River Fish Entrained at a Nuclear Power Plant." ' Journal of the Fisheries Research Board'of Canada, 30 (8) 1195, (1973).

3. Hermal and Intake Studics Guidance Manual, Micaigan Water Resources Commission, Bureau of Water Manage-ment, Michigan Department of Natural Resources, February, 1975.

Gentlemen:

Enclosed find a request for a change to Environmental Technical Specification 4.1.2. a (3) .

This requested change is to delete sampling in the discharge canal for determination of mortality of ichthyoplankton. He state of the art in l entrainment assessment is to assume a 100% mortality of those organisms t passing through the condensers of a power plant and to estimate the number

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! of organisms being entrained in the intake only.

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Mr. B,'J. Youngbloo* ' g. December 12, 1975 y ,;

t 7his position is based on the. results -of earlier workers who have demon-strated that the combined influences of rapid temperature escalation (entering the condenser), retention at the elevated temperature (plume entrainment in the discharge embayment), and the mechanical shearing

~ forces enceuntered by. passing through the circulating water pumps, water boxes and condenser tubes result in mortality values very closely appmach-

'ing 100%.

Marcy (reference 1) reports that of the 100% mortality of the young of .

nine fish species passing through the Connecticut Yankee Atomic Plant, 20% '

was attributable to heat and 80% was due to mechanical abrasion during the

93 second passage through the cooling system.

Survival of entrained fish will depend in part on th'e -length of time the fish are exposed to elevated temperatures. Since the elevated temperature will exist for a period of time equal to the water residence time in the j discharge canal and embayment, these larvae will be exposed to the elevated 3 temperature for approximately 4.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> in the discharge of Arkansas Nuclear One.

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- Marcy (reference 14 2) has . demonstrated that at 350C (95 F) 100% mortality occurred during passage thmugh the plant. . Marcy concluded that approximately 20% of the total morcality which occurred during plant passage was caused y

by heat shock and prolonged exposures (50 - 100 min.) to tenperatures above 820F.

n I Discharge fsampling would require the same degree of effort as the intake sampling-to give statistically compatible data. Since discharge sampling 1

is to determine survival and previous studies have shown survival to be practically. non-existant, we do not feel that the time, manpower and expense should be expended on discharge sampling. Instead we propose to quantify the numbers and kinds of larvae enterhg the plant, assume the worst case appreach of 100% mortality and if no significant impact is detected on this basis, then actual mortality studies would not be necessary. If the impact

' is significant, then survival studies may need to be done.

We request your timely review to facilitate our preparations for implementa-tion of this program next April.

Very truly yours,, ,

/

ll J. D. Phillips

-Senior Vice President JDP:ay ,

Enclosure-

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