ML20147J327

Memorandum Concerning Bd Questions.Puts Parties on Notice That Bd Will Have Questions Concerning Oper of Dirty Radwaste Sys.Resolution of Discrepancies to Be Sought at Next Meeting

ML20147J327
Person / Time
Site:	05000514, 05000515
Issue date:	12/15/1978
From:	Yore J Atomic Safety and Licensing Board Panel
To:
References
NUDOCS 7812280086
Download: ML20147J327 (2)

Text

NRC PUBLIC DOCUMENT ROOM 96 4

'. *5!2 UNITED STATES OF AMERICA w NUCLEAR REGULATORY COMMISSION l5 DECl 51970 > d k T*f.,7 7%

BEFORE THE ATOMIC SAFETY AND LICENEING BOARRg waa 8 In the Matter of "

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PORTLAND GENERAL ELECTRIC COMPANY, ) Docket Nos. 50-514 ET AL. ) 50-515

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(Pebble Springs Nuclear Plant, )

Units 1 and 2) )

MEMORANDUM CONCERNING BOARD QUESTIONS The purpose of this memorandum is to put the Parties on notice that the Board will have questions concerning the operation of the " dirty radwaste system" (DRS).

We note that Applicants' Amendment 12 (July 1978) has modified the proposed operation of the DRS; there is no longer a requirement to process the secondary system wastes

, when the concentration of radioactive nuclides exceeds 10-6 M Ci/cc. We note that the Applicant " assumes that the entire annual volume of secondary wastes are discharged at an annual average concentration of approximately 10-6 microcurie /cc (excluding tritium)". We further note that under that assumption "the estimated annual discharge of activity from the secondary system amounts to approximately 0.01 Ci/yr,"

I and that the estimated whole-body dose to a nearby resident is 0.49 mrem /yr (Table 11.2-2). We inquire as to the basis for that assumption and the proposed operational procedures that will assure compliance with Appendix I to 10 CFR 50.

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We have also received the Revisions ;o NRC Staff Evaluation of Liquid Radwaste System dated November 3, 1978.

We note that "the Staff assumed that 50% of the regenerant solutions will be discharged to the coolant reservoir wit aut treatment." Under that assumption the Staff has estimated a rele~ase of 3.8 Ci/yr, over 100 times greater than estimated by the Applicant. However, the Staff's estimate of whole-body dose to a nearby resident is only 0.033 mrem /yr, much less than estimated by the Applicant. We would like further information from the Staff concerning the basis for the estimated release rates and the calculation of dose.

We will seek a resolution.of the discrepancies between the estimates of the Staff and Applicant concerhing the releases and doses at the next session of the evidentiary hearing.

FOR THE ATOMIC SAFETY AND LICENSING BOARD d_ m 7 Mw -

Ja h R. Yore [hairman Dated at Bethesda, Maryland this 15th day of December 1978.

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