ML20216B386
| ML20216B386 | |
| Person / Time | |
|---|---|
| Site: | San Onofre  |
| Issue date: | 05/07/1998 |
| From: | Nunn D SOUTHERN CALIFORNIA EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| Shared Package | |
| ML20216B392 | List: |
| References | |
| NUDOCS 9805180059 | |
| Download: ML20216B386 (2) | |
Text
It SOUIHIRN CALIFORNIA e
b EDISON o-is'*' """"
Vice President An EDISON INTERNATIONAL" Company l
May 7, 1998 l
U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, D.C. 20555 Gentlemen:
i l
Subject:
Docket Nos. 50-361 and 50-362 Amendment Application Nos. 177 and 163 DEFINITION OF DOSE EQUIVALENT I-131 San Onofre Nuclear Generating Station Units 2 and 3 Enclosed are Amendment Application Numbers 177 and 163 to Facility Operating Licenses NPF-10 and NPF-15 for San Onofre Nuclear Generating Station (SONGS)
Units 2 and 3, respectively. These amendment applications consist of Proposed ChangeNumberNPF-10/15-492(PCN492),whichrequestschangestoTechnical Specification (TS) Section 1.1, " Definitions."
The proposed amendment to TS 1.1 is to change the reference for obtaining the thyroid dose conversion factors (DCFs) used in the definition of Dose Equivalent Iodine 131 (I-131).
Specifically, the reference to " Table E-7 of Regulatory Guide 1.109, Rev.1, NRC,1977," is to be replaced with a reference to the International Commission on Radiological Protection Publication 30 (ICRP-30), Supplement to Part 1, pages 192-212, Tables titled, " Committed Dose Equivalent in Target Organs or Tissues per Intake of Unit Activity."
Utilization of the more recent ICRP-30 DCFs will provide a more realistic assessment of predicted thyroid dose consequences associated with releases of radioactivity as compared to Revision 1 of Regulatory Guide 1.109.
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If you would like additional information on this Technical Specification change request, please let me know.
Sincerely, f
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Dwight
. Nunn 1
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Enclosure cc:
E. W. Merschoff, Regional Administrator, NRC Region IV K. E. Perkins, Jr., Director, Walnut Creek Field Office, NRC Region IV J. A. Sloan, NRC Senior Resident Inspector, San Onofre Units 2 & 3 J. W. Clifford, NRC Project Manager, San Onofre Units 2 and 3 l
S. Y. Hsu, Department of Health Services. Radiologic Health Branch l
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