ML20235R244

Forwards Rev 0 to Offsite Dose Calculation Manual for TU Electric Comanche Peak Steam Electric Station. Rev Incorporates Procedural Details from Radiological Effluent Tech Specs

ML20235R244
Person / Time
Site:	Comanche Peak
Issue date:	03/02/1989
From:	William Cahill TEXAS UTILITIES ELECTRIC CO. (TU ELECTRIC)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
Shared Package
ML20235R247	List: ML20235R244 ML20235R248
References
TXX-89118, NUDOCS 8903030218
Download: ML20235R244 (2)

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Log # TXX-89118 File # 10110 l Z C Ref. # 10CFR20.106 j 1UELECTRIC i March 2, 1989 W. J. Caleill E,ecutne Vice President .

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U. S. Nuclear Regulatory Commission Attn: Document Control Desk 1 Washington, D. C. 20555 i

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)

DOCKET NOS. 50-445 AND 50-446 Transmittal of Offsite Dose Calculation Manual (0DCM) l 'REF: 1) TV Electric letter (TXX-88593) to NRC dated August 8, 1988

2) NRC letter to TU Electric dated February 14, 1989, from C. Grimes to W. J' Cahill-Gentlemen: I Please find enclosed the revised Offsite Dose Calculation Manual (00CM) for Comanche Peak Steam Electric Generating Station' unit'1. The ODCM was revised ,

to: (1) incorporate procedural details from the Radiological Ef fluent 4 Technical Specifications (RETS),.and (2) correct the discrepancies identified in the NRC review of ODCM calculational methodologies .

NRC Generic Letter 89-01 presented the methodology for implementing )

programmatic controls of RETS within the Administrative Controls Section of "

the Technical Specifications and for relocating the procedural details of RETS to the ODCM or the Process Control Program, as appropriate. A meeting was ]!

held'on February 22, 1989 with the NRC staff to review TV Electric's approach

-for incorporation of appropriate RETS into the ODCM and.to discuss site  ;

specific changes to the standard RETS'. The relocated Technical '

Specifications, including the site specific changes, have been incorporated in l- the ODCM, in Part I, " Radiological Effluent Controls".

TV Electric had previously submitted the ODCM to the NRC for review in

-August, 1988 (reference 1). NRC comments pertaining to this submittal were documented in Technical Evaluation Report (TER) EGG-PHY-8396, transmitted with reference 2.

The revised ODCM, in Part It, " Calculational Methodologies", includes changes to address and correct the discrepancies and recommended changes identified in section 4 of the TER with the exception of the following items:

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, a TXX-89118 March 2, 1989 Page 2 of 2 i o A dose factor for Mo-99 was not added to Table 2.3, Mo-99 was incorrectly identified as a principal gar:na emitter in Radiological Effluent Control (REC) Table 4.11-2. REC 3/4.11.2.1 requires that only particulate with half-lives greater than 8 days be included in dose rate calculations. The half-life of Mo-99 is approximately 66  :

hours. Therefore, Mo-99 was deleted as a principal gamma emitter in  !

Table 4.11-2 in Part I of the ODCM. l 0 No specific change was made to the methodology for projecting doses due to liquid effluents in order to account for doses due to l radionuclides buildup in Squaw Creek Reservoir. The existing dose projection methodology already takes into account doses due to radionuclides buildup since such doses are included in the actual cumulative dose totals calculated using ODCM Equation 1-7. This actual total dose for the quarter-to-date is used to project doses j for the next 31 day period. '

e The dose factors for C-14 were not recalculated. C-14 was deleted from Tables 2.2 and 2.3 since C-14 is not an isotope normally present in gaseous effluent releases from nuclear power plants.

o Constants for converting concentration to counts-per-minute (cpm) were not included in equations for calculating radiation monitor alarm setpoints. CPSES radiation monitors are digital monitors. The conversion factor from cpm to engineering units is determined during the calibration of each monitor and is input into the data base for the monitor microprocessor. The monitors are therefore calibrated to readoutintheapproprjateengineeringunits (i.e.,pCi/ml or pCi/cm ).

i It is believed that the information incorporated into the revised ODCM and the exceptions that are identified above are acceptable responses to the items i raised in the TER. j l

Sincerely,

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William J. Cahill, Jr KGP/ddm c - Mr. R. D. Martin, Region lv Resident Inspectors, CPSES (3) l L _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _