ML20141M967

From kanterella
Jump to navigation Jump to search
Responds to Request for Addl Info Re Response to Notice of Violation Noted in Insp Rept 50-454/85-38.Summary of Analysis Demonstrating Mixing of Liquid Radwaste Along Circulating Water Blowdown Piping Encl
ML20141M967
Person / Time
Site: Byron Constellation icon.png
Issue date: 02/04/1986
From: Farrar D
COMMONWEALTH EDISON CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20141M965 List:
References
1253K, NUDOCS 8603030149
Download: ML20141M967 (3)


Text

4 .

4 N

c' -

/,_.sN Commonwe:lth E:" son

  • U- ) One First National Plaza. Chicago. Ilknots g C ~ Address Reply to. Post Office Sox 767

\ Chicago, lihnois 60690 l

February 4, 1986 l

l Mr. James G. Keppler i l

Regional Administrator l U.S. Nuclear Regulatory Commission l l Region III  !

l 799 Roosevelt Road j Glen Ellyn, IL 60137

Subject:

Byron Station Unit 1 I&E Inspection Report ,

No. 50-454/85-038 l l

References (a): October 1, 1985 letter from W. D. Shafer to Cordell Reed (b): October 31, 1985 letter from D. L. Farrar J. G. Keppler (c): November 21, 1985 letter from W. D. Shafer to Cordell Reed

Dear Mr. Keppler:

Reference (c) requested Commonwealth Edison to provide additional information concerning the response to the Notice of Violation appended to reference (a). Specifically, it was requested that we provide an analysis to demonstrate that dilution of a liquid radioactive release took place prior to discharge into the Rock River on August 22, 1985. Enclosed is a l su:cmary of an analysis that demonstrates mixing of the liquid radwaste did occur along 580 feet of circulating water blowdown piping. Consequently, we do not believe the liquid radwaste release remained a bolus.

We offer the following additional comment in support of our position regarding Violation 2. The circulating water blowdown radiation monitor is located in the blowdown piping where it is routed near the turbine building.

This monitor is within the restricted area and is approximately 2 1/2 miles away from the unrestricted area via the blowdown piping. Since Technical Specification 3.11.1.1 applies to concentrations of radioactive materials in l

FEB 51986 l 8603030149 860225 i PDR ADOCK 05000454 i G PDR

,9 .~ -

J. G. Keppler February 4, 1986 the unrestricted area, the imediate action requirement of this specification does not apply to the initiation of the circulating water blowdown radiation monitor alarm.

Please direct any further questions regarding this matter to this office.

Very truly yours.

, = _= m v -m M D. L. Farrar Director of Nuclear Licensing im Enclosure cc: Byron Resident Inspector l

l 1253K

(-

,i .

O

SUMMARY

OF WE3TINGHOUSE ANALYSIS Assumptions made:

- Analytical model will consist of a straight length of smooth pipe.

- Average blowdown flowrate of 23,000 gpm.

- Calculations based on 36" diameter blowdown piping.

- Water in piping from previous blowdown provided no dilution.

- Ambient water tempetuture.

Mixing formulas:

- Fluid flow into a pipe containing another fluid will disperse through a length of S where:

S2 = 437a X V

  • u a = radius of pipe (ft.)

u = mean speed of flow (ft/sec)

X = distance the fluid moves (ft.)

y = friction stress ~ (based on Reynolds number for smooth pipe) density Dispersion length S = 577 Ft.

The volume of blowdown water affected by the dispersion of the liquid radwaste released is calculated as V = SA where:

A = cross section of blowdown pipe In conclusion, the liquid radwaste would have mixed with the blowdown water spanning 577 ft. of piping which corresponds to 30,500 gallons of water.

Reference:

Technical Paper by G. Taylor, "The dispersion of matter in turbulent flow through a pipe", Proceedings of the Royal Society. Series A, Vol. 223, 1954.

1253K