ML18019A274

Provides Addl Info Re Offsite Dose Calculation Manual Submitted on 850831,per 850404 Request.Setpoint Calculation for Normal Svc Water Monitor,Basis for External Radiation Value & Direct Radiation Dose Estimates Provided

ML18019A274
Person / Time
Site:	Harris
Issue date:	07/01/1985
From:	Zimmerman S CAROLINA POWER & LIGHT CO.
To:	Harold Denton Office of Nuclear Reactor Regulation
References
NLS-85-226, NUDOCS 8507160410
Download: ML18019A274 (12)

Text

REGULA 'f INFORMATION DISTRI BUTIOI ~Y'STEM (RIDS)

ACCESSION NBR 850716041 0 DOC DATE

~ o 85/07/0] NOTARIZED Shearon Harris Nuclear Power Plantr Unit 1< Carolina NO'OCKET'ACIL:50-400 05000400 AUTH NAME, AUTHOR AFFILIATION

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ZIMMERMANES.R, Carolina Power 8 Light Co ~

REC IP NAME

~ RECIPIENT AFF IL'IATION DENTONEH ~ RE Office of Nuclear Reactor Regulationi Director

SUBJECT:

Provides addi info re offsite dose calcualtion manual submitted on 850831<per 850404 request+Setpoint calculation for normal svc water monitorEbasis for external radiation value 5 direct radiation dose estimates pl ovided, DISTRIBUTION CODE: A009L COPIES RECEIYED:LTR $ ENCL J. SIZE:

TITLE: OR/Licensing Submittal: Appendix I NOTES; RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL" NRR L83 BC 01 7 7 INTERNAL; ACRS 11 6 6 ADM/LFMB 0 ELD/HDS1 19 1 0 NRR/DL/DRAB 0 NRR/Dl./TAPMG 1 1 NRR/DS I/AEB 0 NRR/ ETB 08 1 1 NRR/DSI/RAB 10 1 I 04 1 1 RGN2 1.

EXTERNAL; 24X 1 1 LPDR 03 NRC PDR 02 1 1 NSIC 05 TOTAL NUMBER OF COPIES REQUIRED: LTTR 26 ENCL 22'

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Carolina Power 8 Light Company SERIAL: NLS-85-226 JUL 01 1985 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Washington, DC 20555 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NO. 1 DOCKET NO.50-000 OFFSITE DOSE CALCULATIONMODEL

REFERENCE:

Letter from George W. Knighton (NRC) to Mr. E. E. Utley (CPRL) dated April 0, 1985.

Dear Mr. Denton:

The referenced letter transmitted a request for additional information in regard to the Shearon Harris Nuclear Power Plant Offsite Dose Calculation Manual that was submitted to you on August 31, 1980. Carolina Power R Light provides responses to your request for additional information in Enclosure 1.

If you have any questions, please contact Mr. Gregg A. Sinders at (919) 836-8168.

Yours very truly, S. R. im erman ager Nuclear Licensing Section GAS/crs (1609GAS)

Enclosure cct Mr. B. C. Buckley (NRC) Mr. Wells Eddleman Mr. G. F. Maxwell (NRC-SHNPP) Mr. John D. Runkle Mr. Tin Mo (NRC-RAB) Dr. Richard D. Wilson Dr. J. Nelson Grace (NRC-RII) Mr. G. O. Bright (ASLB)

Mr. Travis Payne (KUDZU) Dr. J. H. Carpenter (ASLB)

Mr. Daniel F. Read (CHANGE/ELP) Mr. J. L. Kelley (ASLB)

Wake County, Public Library 85071S0O>0 S5070>

PDR ADOCK 05000400 A PDR 411 Fayettevilte Street o P. O. Box 1551 o Raleigh, N. C. 27602

ENCLOSURE 1 RESPONSES TO U. S. NUCLEAR REGULATORY COMMISSION REQUEST FOR ADDITIONALINFORMATION IN REGARD TO THE SHEARON HARRIS NUCLEAR POWER PLANT (SHNPP) OFF-SITE DOSE CALCULATIONMANUAL(ODCM)

Comment 1:

Although the Applicant indicated that the normal service water (NSW) is monitored and covered by T/S 3.3.3.0, the Applicant has not provided a setpoint calculation of such a monitor. Also, the Applicant's Figure 2.1-2 does not show such a flow path in the flow stream diagram. Provide the setpoint calculation for the NSW monitor, and revise Figure 2.1-2 as appropriate.

~Ree once:

The setpoint for the normal service water (NSW) monitors will be determined by either of the two methods listed below:

Method 1 - This method determines the alarm setpoint using the following formula:

2~~Rbk 2T MDC sensitivity where: MDC Minimum detectable concentration for a given isotope (11Ci/ml).

cpm Ambient cpm + ~ cpm/mR/hr).

(mR/hrbkg Time constant of signal processor in minutes (a function of cpmbkg).

Sensitivity For selected isotope (cpm/pCi/ml).

Method 2 This method determines the alarm setpoint as 2 x background.

This latter technique is acceptable from an effluent release standpoint because NSW is not discharged directly to the environment and it undergoes significant dilution in the cooling tower basin. Downstream monitoring for ODCM effluent accountability purposes is provided by the continuous grab sampler in the cooling tower blowdown.

The methods listed above will be incorporated into the ODCM. To show the NSW flow paths, Figure 2.1-3 entitled "Normal Service Water Flow Diagram" will be added to the ODCM. The diagram is included here as Attachment l.

(1649GAS/cr s )

ATTACHMENT 1 Fl, E 2.1-3 NORMAL SERVICE WAT . FLOW DIAGRAM NSW REACTOR AUXILIARYBUILDING

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MAIN CONDENSER TURB INE BUILDING CIRCULATINGWATER PUMPS LEGEND REM RADIATIONEFFLUENT MONITOR NSW NORMAL SERVICE WATER i

, 3 COOLING TOWER BASIN J OO O NSW PUMPS HARRIS LAKE COOLING TOWER BLOWDOWN NOTE: For detsiled flow drawing of Service Water System refer to FSAR Figure 9.2.1-1

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Comment 2:

Under Assumption (0), the Applicant stated, "To sum numbers represented as less than

(<), use the value of the largest number in the group (i.e., <5+<1+<1+<3+ = <5) [sic]."

Provide the basis for this assumption.

~Res nse:

Should the technical specifications as stated in Section 6.1 of the ODCM be exceeded, it is the purpose of Chapter 6.0 to evaluate compliance with 00 CFR 190 on as realistic a basis as possible. Since a total dose estimate must be obtained, the process will require the summation of dose from several dose pathways; and for each pathway, a series of numbers may also require summation. In each of these processes, measurements may provide values that are less than the lower limit of detection (LLD) for the analytical system. - From the theory of analytical sensitivity (see NCRP-58 1978), it is conceivable that the < LLD values actually range from negative numbers to the LLD itself. Clearly, if zero or negative numbers are used in the dose estimate processes, it would bias the results in a nonconservative manner. Similarly, if the LLD value is used, an overly conservative bias may result. Assumption (0) provides a reasonable "middle course" that seeks to eliminate unnecessary bias in either nonconservative or overly conservative directions.

(1649GAS/crs )

1 Comment 3:

Under Applicant's Step (I), the Applicant stated that the direct radiation dose at the plant boundary in each sector will be determined. The Applicant, however, has not indicated by what method this direct radiation dose will be obtained. Provide the method for estimating doses from direct radiation.

~Res nse:

It is the Applicant's intention to evaluate the direct radiation dose at the site boundary in both the preoperational and operational phases of the plant. Measurements will be performed with pressurized ionization chambers or equivalent devices. Measurements will be performed at the same locations in each phase to discern the direct radiation contribution from plant operation. After these baseline values are obtained, the in-place thermoluminescent detector (TLD) network will be relied upon to indicate any upward trends in direct radiation. If a significant increase is observed in the direct radiation intensity, it will be reevaluated utilizing the method described above.

(1649GAS/crs)

0 Comment 0:

The Applicant stated that dose from other fuel cycle sources will be treated as

< 1 mrem/yr. Provide the basis for this statement.

~Res nse:

There are no other uranium fuel cycle sources within a 50-mile radius of SHNPP as defined in 00 CFR l90. Thus, the < 1 mrem figure would be reasonable.

(1649GAS/crs )

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