ML20039A430

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Informs Commissioners of Significant Increases in Total Collective person-rem Doses to Reactor Plant Workers During 1980
ML20039A430
Person / Time
Issue date: 08/28/1981
From: Dircks W
NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO)
To:
Shared Package
ML20039A428 List:
References
FOIA-81-412 SECY-81-517, NUDOCS 8112170581
Download: ML20039A430 (2)
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Text

{{#Wiki_filter:__ f,..,'o [ '_'z > p,' %/ O, fr g s, ~, ...s M ust 28, 1981 PO[lCyl$$y{ SECY-81-517_ sbk b FOR: The com FROM: William J. Dircks Executive Director for Operations

SUBJECT:

UNUSUALLY HIGH OCCUPATIONAL RADIATION DOSES REPORTED FOR POWER REACTORS OPERATING IN 1980 PURPOSE: To inform the Commissioners of significant increases (relative to prior years) in the total collective person-rem doses to reactor plant workers during calendar year 1980. DISCUSSION: The occupational dose data for light water reactors (LWR's) for 1980 have been compiled by the staff. These data show tnat there were significant increases in total person-rem doses in 1980 when ccmpared wita previous years. In the past, the Commission has expressed an interest in receiving f I the latest analyses of power r eactor dose data as they are k compil ed. The enclosure to this paper provides an analysis of these data in advance of the annual NUREG report tabulat-ing occupational radiation doses for LWR's during calendar year 1980. E Highlights of thi, exposure report include the following: BWR's averaged ii35 person-rems / reactor in 1980, a 55% ~- q increase over m 1979 average of 733, PWR's averaged 573 person-rems / reactor in 1980, a 135 increase over ne 1979 average 510. c' 5 ~ The total LWR cupa tional dose for 1980 was approximately i. 54,000 person-ss, a 35% increase over the 1979 tot;l of approxima'. C y 10,000. In an effort to ermine the reason for t1ese significant increases in oct 3 :icnal doses at LWR's, the staff made informal telep? . inquiries to the plant Radiation Prc-tection Manager M's) at eight of the LWR's having the largest dose ir- .ies. The RPM's estimated that approx mately w 35% of the total int dose during 1980 resulted from NRC-

Contact:

D. M. Collins, NRR ~ Ext. 49-27614 ffj2l_gst giggg9 BORSUM81-412 PDR

_g_ (v) mandated activities, such as seismic hanger inspections and changes, snubber corrections, masonry wall modifications, feedwater piping clad removal, and torus and drywell modifications. In a conversation with a GE representative, the staff was told that the major additional doses at BWR's in 1980 were due to activities that, although required by NRC, would have been recommended by G.E. independently of These actions included modification of Mark I toruses the NRC. and replacing certain stainless steel components, that showed integranular stress corrosion cracking, with 316 stainless steel. The GE representative said that higher-than-normal doses could be expected at BWR's during 1981 also, as a result of continuing plant modifications, but that doses should decrease after-1981. The staff has for several years been using criteria to weigh the improvements in plant safety associated with incrr ased inservice inspections against the occupational radiation exposures that result. The data discussed above leau us to believe that more of this sort of cost-benefit balancing needs to be done. In addition, the ACRS has recently (Fermi 2 subcommittee meeting of July 24, 1981) shown an interest in possible occupational health impacts of mandated safety improvements. We have under development a plan for' resolution of safety issues that includes a prioritization system based on assessments of the safety costs and benefits associated with changes in regulatory requirer ents. The costs will include occupational radiation expcares resulting from the installatios of hardware changes or the nanging of operating procedures. In addition, NRR and IE have agreed that the process for development of generic orders, bulletins and information notices will include consideration of potential occupational radiation exposures. These various steps should assure that activities in nuclear power plants mandated by NRC will not be the cause of unjustified occupational radiation exposures. / bl Willi-J. Dircks Execu-e Director for Operations DISTRIBUTI.

Enclosure:

Fommission-i Preliminary LWR Exposure Commission .aff Offices Data for 15 30 ACRS Secretaria ,,. _ _,..,.,_,,, _ _ n._. ~..

^ ^ ' ~* ,, A 8t 8 cq UNITED ST ATEs . [ g/ [h, NUCLEAR REGULATORY COMMISSION w . WASHINGTON, D. C. 20535 ( O MAY 2 81981 9-MEMORANDUM FOR: William E. Kreger, Assistant Director for Radiation Protection, DSI THRU: Douglas M. Collins, Leader Radiation Protection Section, DSI FROM: Charles S. Hinson Radiological Assessment Branch, DSI

SUBJECT:

PRELIMINARY LWR EXPOSURE DATA FOR 1980 Attached is a preliminary compilation and analysis of occupational radiation exposures at opersting light water cooled nuclear power reactors (LWR's) for the 4 year 1980. This infonnation was derived from reports sutmitted to the United States Nuclear Regulatory Commission iri accordance with Part 20.407 of Title 10, Chapter 1, Code of Federal Regulations (10 CFR Part 20.407) and Regulatory Guide 1.16. r One additional LWR completed a full year of commercial operation for the first time in 1980 (only LWR's that had been in commercial operation for at least one full year as of Deccmber 31, 1980, are included in this compilation). This single new operating plant, Hatch II (BWR), increased the number of plants included in this year's compilation to 68. This new unit is indicated in the compilation table by a (N). The number of operating BWR's increased from 25 to 26 in this year's compilation. The yearly average exposure per rector for BWR's in 1980 was 1136 person-rems. This represents a 55 percent increase over the 1979 average of 733 person-rems / reactor. The yearly average exposure per rector for the 42 operating PWR's in 1980 was.578 person-rems. This represents a 13 percent increase over the 1979 average of 510 person-rems / reactor. The overall average exposure per ructor for all LWR's increased 33 percent from 593 persun-rems in 1979 to 791 pcMcn-rems in 1980. The attached exposure compilation table include a brea! can of the person-rems received at each of the LWR's included in the above compG rion for 1980. This table lists the exposure figures which were subnitted by 's licensees in response to the requirements of 10 CFR Part 20.407 and Regulator; _ide 1.16 (R.G.1.16 data shown in parenthesis). The data quoted above and used u

e attached figures is from the 10 CFF Part 20.407 data.

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e s o e MAY 2 81931 e 2-W. Kreger Figure 1 shows the total averag'e yearly person-rems for BWR's, PWR's, and LWR's for the years 1969-1980. For the seventh _ consecutive year, the average yearly exposure for BWR's has rensined higher than the average yearly PWR exposure (the average yearly BWR exposure was nearly double the average yearly PWR exposure in The average yearly exposure for all LWR's in 1980 is at an all-time high 1980). of 791 person-rems / reactor. Figure 2 shows the total _ number of operating reactors 1969-1980. The total and the total person-rems per year plotted for the years collective exposure recorded for 1980 of 53,797 person-rems represents an increase Figure 3a provides a of 35 percent over the 1979 figure of 39,759 person-rems. graphic comparison of the occupational exposures per unit for each BWR operating in 1979 and 1980. Figure 3b provides similar data for PWR's. This data was compiled by Charles S. Hinson, RPS, RAB. J v Charles S. Hinson Radiation Protection Section Radiological Assessment Branch, DSI '\\ L

Attachment:

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AVG. PER504-RE MVREACTo R YE AR (SWRt + PW E@' (2C0 1200 d -160 0 .s)$1 CC - ~'IO (\\,_/ tCC0' - 9CC qco.. w ' 8M I $dC - /\\ w / \\ 700 7CO-L F / \\ E 1* / \\ Geo \\ g 600-i j g W I / \\ ,s \\ ,/ - 500 / \\ 500- \\ y / \\ /*% \\ ~ f \\ s' %e# -,4cc \\ ,/ 400 g \\ 1 \\ L. ". s' / / f p - yeo 300 1 200 - 2co BWR- _.m ioo PW R- - -- 1%9 10 0 rt1l

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