ML20004D604
| ML20004D604 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 05/22/1981 |
| From: | Otoole J, Otoole J CONSOLIDATED EDISON CO. OF NEW YORK, INC. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| 81-100, IEB-81-03, IEB-81-3, NUDOCS 8106090573 | |
| Download: ML20004D604 (12) | |
Text
John D. o*Toole vic3 Prescent Conschcatec Ecison ComDany of New Y. rx, Inc.
4 Irving P' ace. New York. NY 10003 Teleonone (212) 460-2533 Letter No.81-100 May 22, 1981 Re:
Indian Point Station Docket Nos.50-003 50-247
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Mr. Boyce H. Grier, Director Office of Inspection and Enforcement h21 U.
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Nuclear Regulatory Commission o.s. 3%
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Region I
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631 Park Avenue i.,
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King of Prussia, PA 19406 y ]
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Dear Mr. Grier:
Your letter dated April 10, 1981 enclosed IE Bulletin No. 81-03 which relates to potential flow blockage of cooling water to safety system components by Corbicula sp. (Asiatic clam) and Mytilus sp. (Mussel).
Our response to IE Bulletin No. 81-03 is provided in the Attachments to this letter.
This information is being submitted pursuant to Section 182a of the Atomic Energy Act of 1954. Should you or your staff have further questions on the letter or attachments, please contact me.
Ver truly yours,
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4 if3 y Attachments cc:
Mr. T.'Rebelowski, Resident Inspector U.
S. Nuclear Regulatory Commission
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Subscribe a d sworn t before
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Notary Puolic
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THOMAS !.CVE Notary Pu::he State of New York No. 312409633 Qualified in New Y '< C rinty sson bones Maren x. ues
ATDOMENT I Item (1) i Determine whether Corbiculz. sp. or.Wti'cs sp. is present in the vicinity of the staticn (local env1rentrent) in either the source or receiving water body.
If the results of current field monitoring ptw wKs provide reascnable evidenm that neither of these species is present in the local environment, i
no further acticn is necessary except for items 4 and 5 in this section for holders of operating licenses.
Respcnse (1)
We have determined that raither Cerbicula sp. nor M/tilus sp. is present in the Hudscm River in the vicinity of the Indian Point Staticn and therefore l
neither direct visual inspecticns nor water ficw measurement of the indivi-dual system ccarpcnents as per Acticm Items 2 and 3 are h racessary. 'Ihis l
a determinaticn is %=d upcn the ccnsideration that neither species has been collected in pricr sar:pling efforts in the vicinity of Indian Point (see respcnse to Item 5) nor has either appeared in the periodic inspeJ.cns of the Staticn's cmdenser water boxes and tubing.
'Ihe spread csf Cerbicula sp. is closely mcnitored by several scientific groups, including utility biologists. Cem=Mcaticn with individuals with active interest in the subjects cf Ccrbicul_a sp. distributica and/or Hudsen River i
benthos indicates that this clam is nct found in the Hudscn River..Wtilus is ccJy fourd in the most salire reaches ef the estuary, and has not extended its range to include the area of the Indian Point Statien (see respense to item 4 and 5).
I i
l Durity a re nt (Noventmr-Del 1980) replacement of fan cooler unit cer:po-nents and servi water piping repairs ard nodifications, examination of the removed lines directly cerfW the absen of these organisms and their relic shell debris. Actually, there is no evidence that any benthic macroin-vertebrat. blockage prcblem has ever occurred at the Lh Point Station.
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Item (4)
Describe methods either in use or planned (including inpleentaticn date) for preventing and detecting future flw blockage or degradaticn due to clams and maaala or shell debris.
Include the follwing information in this descripticn:
a.
Evaluaticn of the potential for intrusicn of the crganisms into these systems due to lw water level and high velocities in the intake structure expected during worst case ccrditicns.
I b.
Evaluaticn of effectiveness of preventicn and detection methods used 1.n the past or present or planned for future use.
% (4)
Methods in use for preventing and detect 2ng future f1w bicckage er degradation due to clams, Ws==1= cr shell debris include 64 monitoring and logging (every 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />) of the operating tenperature of ccupcnents cooled by the service
. water system (e.g. generator seal oil coolers, generatcr hydrogen coolers, ccmpcnent cooling heat exchangers, etc.). 'Ihis measure provides an effective and reliable :ethod for detecting ancxralies such as ficw bicckage or degradatien in the system.
In additien, pericxiic physical examination (typically 2-3 times per year at Unit 2) of the condenser water boxes and tubes is un@An to determine whether chlerination is. % ed. Based cn these candenser i. w i.cns, the:.e has been no need to chlcrinate en a regular basis for the past several years. 2e last chlorinaticn at the Indiaa Pcint Statien was performed during August 1978.
i Sin neither Cerbicula ner Mvtilus has been fcund during the physical examinaticns cf the cooling water and service water systems er in river sangling near Indian Point, it is reascnable to assume that a worst case ccm-binaticn of 1cw water and high intake velocity w.nid not result in an uptake of these bottczn dwellW macroinvertabrates.
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s It is possible that Corbicula cx:uld W esi-ah14ahad in the Eudscn River.
In our judgment, the very low water tenperatures during the winter mcnths 1
and the Indian Point regicn's variable salinity.@ will prevent colcni-j zaticn fran reaching nuisance levels rapidly. 2 erefore, we believe that the pericdic cerf.anser inspecticns will adequately forewarn of infestaticn by this organism. 24se inspecticns would also detect t!a presence of Mvtilus, but it is censidered highly unlikely that this species would sud-denly emerge as a biofouler at the Staticn. Mvti.lus has been fcund in the Hudscn River cnly as far ncrth as the George Washingtcn Bridge.
Its absence in the Indian Point area is al:: cst certainly attributable to the f.hter and low salinity ecnditions which prevail there for much the year (e.g.,
ccnductivity generally remains below 1 mS/c:n except frcm June througtt September). Mvtilus larvae are especially intolerant of such ccrditicns.
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Item (5)
Describe the actions taken in items 1 through 3 above and include the following informaticn:
a.
Applicable porticms of the envi.mtal mtnitoring p%cce im1M4ng last sanple date and results, b.
ce nts and systems affec*M.
c.
Extent of fouling if any expected.
d.
How and when fouling was discovered.
e.
Corrective and preventive actims.
Respmse (5)
It was determined that infestation by Corbicula sp. and M/tilus sp. of safety system cenpcrents is not a prcblem at Indian Point since neither species appears in the local envi. m t.
Attached (Attacfrent II) are swf descripticns of the most recent env1.ren-mental sar:pling programs ccnducted in the area of Indian Point (river mile 43) and other locaticra en the Hudscn River. De Bowline Point Station is lccated at river mile 38, Ossining is located at river mile 34, Cormall is located at river mile 57, and the Roseten/Danskamer Staticns are 1ccated at river mile 65.
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ATDCHENT II Ccn Ediscm, Power Authority of the State of New Ycrk, Orange and Rockland Utilities and Central Hudscn Gas and Elec Tic Corp. hawn independently or jointly financed several studies which have examined the ccupesitien of the Hudscn River benthic - nity. Collectively, these efforts represent a corprehensive analysis of benthos in the vicinities of the river's generating staticns, and to a lesser extent, characterize the benthic ccupesiticn of the middle estuary (from the Tappan Zee Bridge to Albany).
Studies were cenaead fmn 1971 through 1977. Each study was generally restricted to a small geographical regicn, e.g., in tra vicinity of an i
existing or prcpesed generating staticn.
Neither Ccrbicula sp. ncr.YJ.lus sp. were fcund in any of these studies.
A brief descripticn of sa::pling procedures fer each investigatica is pro-vided cn the fol' lowing pages.
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Hudsal River Enviramental Study in the area of Ossining. January 1975.
(Prepared for Cmsolidated Ediscn Co. of New York, Inc. by Texas instru-ments Incorporated)
Quantitative benthic sanples were obtained ntnthly fmn May through
% _r 1972 and Marcf1 through April 1973 at six sanpling stations using S' nce the dredge sanpled an area of 0.1m*,, densities a Petersen dredge.
i 2
were recorded as mean nunte.c of organisms per 1.0m of bot *m Supplemen-tary benthic sanples were cbtained with minncw seines in the littoral zcne at the Hudscn near river mile 33. All benthic sanples were wasbad using 250 p mesh seines.
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Benthic Landfill Studies Cor: wall, February 1975.
(Prepared for Cmsolidated J
Ediscn Co. of New Ycdc, Inc. by Texas Instruments Inccqcated)
'Ihe benthes and epibenthcs near Cenwall were sanpled between "ay 1973 and June 1974 during ice-free := H Ms. Five different sanpling gear were used:
2 artificial substrates, Peterten grab (dredge), epibenthic sled (0.5m ),
sweep net and 0.5m diameter plank +m net. Up to nine irdividual sanpling staticms, all within me mile of the prcpesed Ccrnwall staticn (river mile 56), were sanpled each ncnth, with the exceptien of artificial sub-strates which were set and retrieved within two week intertals. Densities and total nunters collected per taxcn were reported.
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Hudscn River Ecological Study in the area of Indian Point 'Ihermal Effects e
W.
September 1976.
(Prepared for Censolidated Edison Co. of New Ycrk, Inc. by Texas Instrinnents Inhpsted)
Benthos was sanpled ntnthly (April thrcugh Decerter) frcm 1972 through 1974 2
using a 0.1m Petersen dredge at seven staticns frcm river miles 39 to 42.
Five replicate saples per staticn were taken during 1972; three replicate sanples per staticn were taken during 1973-74.
3 1972-73, a biolcgical dredge qualitatively sanpled the mcre.ile epibenthic ccm: unity; this ccr:mmity 2
was also sanpled with a 0.25m epibenthic sled in 1974.
In 1972, littoral benthcs was sanpled qualitati'=1y at six statiens using sweep nets, minnow seines, sand seines and dip nets en a bimenthly basis. Artificial substrates were placed at seven staticns lccated betwen river miles 38 and 44; the substrates were analyzed after a ene mcnth colcnization pericd.
Sanples were washed in seines ranging frcm 0.25 nm nesh to 4.0 nm nesh. Organisms w_re identified, enumerated and weigbad. Densities and bicrnass data were calculated for each benthic species.
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Bowline Point Generating Suticn. Near-Field Effects of Once-Through Cooling System Operaticn cn Hudscn River Biota. July 1977.
(Prepared for Orange and Rockland Utilities, Inc. by Ecological Aralysts, Inc.)
Several Danan or Pr.nar dredge sanples were collected at variable sanpling frequencies at four to fifteen staticr.s in the vicinity of Bowline Point frca 1969 through 1976.
The dredge sanples were washed using a 420 u mesh (April-July 1971 and 1974-76) cr a 500 p mesh (Decenter 1971-1972,1973) sieve. Duplicate sanples per sanpling staticn were analy::ed; the orga.h were identified, enumerated, weighed and r w Led as numbers or grams per 0.25 ft.
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'Rosetcn Generating Staticn. Nearfield Effects of Once-2xcugh Cooling Operaticn cn Hudscn River Biota. July 1977 (Prepared for Central Hudson Gas & Electric Ccrp. by Ecological Analysts, Inc.)
A n:acrobenthic sanpling ptg1. n was perfacned in the vicinity of tra Rosetcn and Danskanner Staticos frcm 1971 through 1976. Gerarally, several Ecnan or Pcoar dredge sar:ples were collected mcnthly cr bircnthly frcm spring through autmn of each year at three to eight staticns in tra vici-nity of the staticns. 'Ihe dredge sanples were wasPad through 420 cr 500p me 5 M. eves and were identified, enumerated and weigrad.
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1977 Annual P- @ ass Report.
1978.
(Prepared for Central IIudscn Gas &
r Electric Corp. by Lawler, Matusky & Skally Engineers)
Frcm 1975 through 1977, a fiester-Dendy Artificial Substrate Program was ccmducted in the vicinity of the Rcset:n and Danskarmer Generating Staticns.
Um smplers were set in dplicate at six staticns at depths of 20 feet for two rxnth colcni::aticn periods. 'Ihe sanplars were first set in April, the last set was retrieved in Decernber; these four sanpling sets were run each year.
In the laboratory, unpreser/ed replicated sanples were scraped and washed through a 425 ;.1 mesh sieve. Follcwing the washing process, the organisms were identified, counted ard weighed (tba latter for bicrnass determinations). Mean abundances and bicmass were determined for each staticn and taxen.
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