ML19256D716
| ML19256D716 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 05/27/1977 |
| From: | Grimes B Office of Nuclear Reactor Regulation |
| To: | Goller K Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7910220631 | |
| Download: ML19256D716 (2) | |
Text
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n eu ' S hw M RANDUM F0F,: Karl R. Coller, Assistant Director for Operating Reactors, DOR FROM:
Brian K. Grimes, Chief, Environmental Evaluation Branch, DOR
SUBJECT:
REVIEW OF PROPOSED CELORINATION PRACTICES AND GLORINATION STUDY AT TEREE MILE ISLXID PLANT NAME: Three Mile Island Nuclear Station Unit 1 DOCKET NUMBER: 50-239 RESPONSIBLE BRANCH: Operating Reactors Branch No. 4 PROJECT MANAGER:
G. Zwetzig ESTIMATED COMPLETION DATE: May 31, 1977 TAC NUMBER: 6578 REVIEW STATUS: Review complete The Environmental Technical Specifications for Three Mile Island Nuclear Power Station Unit I require that a 90-day test program be conducted to establish chlorination practices which would effectively control bio-fouling and simultaneously meat chlorine discharge standards. By letter dated October 29, 1976, Metropolitan Edison Company submitted a copy of their final report of this study. We vers requested to review the results of the study and determine whether we concur with their conclusions. The results of our review indicated that the licensee's proposed chierination procedures are acceptable and we concur with the licensee's couclusions to the extent that they apply to the proposed chlorination procedures.
Data are presented in Tables 3, 8, 11 and 13 of their report which indiente that the proposed chlorination procedures will result in acceptable (less than 0.01 ppm free residual or total residual) discharge concentratir,s.
The other part of this 90-day test was to determine the effectivent;s cf the chlorine procedures in maintaining clean heat transfer surfaces in the river water and recirculating water systems. No indication of system fouling sotained, indicating either no fouling was present in the system or the was tests were not sensitive enough to detect it.
We have reviewed the actual tests made and judge that the test insensitivity was becsuse of " state of the art" limitations and not the fault of the licensee. The tests indicated that the chlorination procedures are adequate or more than adequate in keepin;;
the heat transfer surfaces clean; in fact, more chlorine may be being used
Contact:
W. Pasciak, EIB/ DOR
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4 Karl R. Coller ~2-F# * ~ 57 D % ) $dulefj;-]Y%f f ~ A } WS .22 than is necessary. The levels of usage that the licenses proposed have been assessed and estinated to be acceptable as far as environmental impact is concerned. it is alvars preferable from an environmental impact standpoint, however, to limit the usage of chemicals to the minimu:2 acounts that are necessary. As chlorine is a relatively expensive chemical we feel that it would also be of benefit to the licensee to use the minimum amount necessary. We recort:end that the licensee continue these effectiveness tests at lower chlorination rates to determine this minf - effective level, although we do not have a regulatory basis to require them to do this. We recommend that this be suggested to them. If they do elect to conduct fur-ther tests, we would be very interested in learning the outcome. The major biofouling problem that has been experienced at Three tille Island has been due to excessive periphyton growth observed on slats at the top of the natural draft cooling tower. This growth became so dense at ticca (prior to initiation of chlorination of the recirculating water system) that the water flow distribution over the tower packing became altered and the effectiveness of the tower cignificantly dropped. The tests showed a positiva correlation between decreased growth and increased applied dosages of chlorine. Several othsr tests and correlations were made involving con-centrations of thermophilie bacteria, oxygen production during and af ter chlorination, phytoplankton density, vster temperature and turbidity, air temperature, and cloud cover, in an atte=pt to better understand the peri-phyton growth phenomenon. Our review indicated that these tests were largely unsuccessful in gaining a better understanding of this phenomenon. We conclude that the current technical specifications are adequate to protect the environment and that no new limits or additional test programs need be required as a result of the reviewed information. Brian K. Grimes, Chief EnviroTmental Evaluation Branch Division of Operating Reactors cc: V. Stello D. Eisenhut DISTRIBUTION: R. Samworth Central Files J. Lahr EEB Reading ff}} G. Zwetzig B. Grimes R. Raid R. Cudlin . duibert E. Adensam asciak EEB/0T/ DOR EEB/0T/COR EMTfDf or ric a, WPasciak:br, EAde:irah $GF)fes' su==.,,, 5/@ /77 k 5/ L'77 M /77 o.T., NRC FORM MS (9-76) NR L240 W u. s. oove ammsNT PmhTINo OrrICE: 19 7s - e24-e14}}