ML20076J601
| ML20076J601 | |
| Person / Time | |
|---|---|
| Site: | Harris  |
| Issue date: | 08/31/1983 |
| From: | Hogarth W CAROLINA POWER & LIGHT CO. |
| To: | |
| Shared Package | |
| ML20076J582 | List: |
| References | |
| ISSUANCES-OL, NUDOCS 8309070265 | |
| Download: ML20076J601 (19) | |
Text
_ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ - _ _ _ _ _ _ _ _ ________ _-_ -_____-___ _ _ - _ - _ _ _ _ _ _ _ _ - - - _ _ _ _ _ _ _ _ _ _ _ _ _ _
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UNITED STATES.OF AMERICA b.h' D NUCLEAR REOULATORY COMMISSION .-
B_EFORE THE ATOMIC SAFETY AND LICENSING BOARD
&- Pf 3 b?c~' ~y-In the Matter of ) &'T SECrj;Vlf.!;
3M,jth
)
CAROLINA POWER & LIGHT COMPANY )
AND NORTH CAROLINA EASTERN ) Docket Nos. 50-400 OL
- MUNICIPAL POWER AGENCY ) 50-401 OL
)
(Shearon Harris Nuclear Power Plant, )
Units 1 & 2) )
AFFIDAVIT OF WILLIAM T. HOGARTH IN SUPPORT OF
SUMMARY
DISPOSITION OF EDDLEM AN CONTENTION 75 (BIOFOULING)
STATE OF NORTH CAROLINA )
)
j COUNTY OF WAKE )
William T. Hogarth, being duly sworn according to law deposes and says as follows:
- 1. I am Manager-Environmental Technology Section of Carolina Poder & Light Company, and give this affidavit in support of Applicants' Motion for Summary 1 Disposition of Eddleman Contention 75. I have personal knowledge of the matters set
[ forth herein and believe them to be'True and correct to the best of my information, i .,
knowledge and belief. A summary of my professional qualifications and experience is l attached as Exhibit "A*' hereto.
- 2. Eddleman Contention,75 in this proceeding asserts that one or more species of l
clam, oyster or other marine growth (e.g. barnacle) will prove resistant to blocides adaed to cooling tower water and thus be able to grow and live in the SHNPP condensers creating debris which would foul and block the condensers preventing the plant's access to its ultimate heat sink, with serious safety consequences. The purpose of this affidavit 8309070265 830901 PDR ADOCK 05000400 Q PDR
is to summarize 1) the potential for biofouling at the Harris plant, and 2) the monitoring efforts, plant sy:' ems, and control procedures of the Applicants which will prevent biofouling,in' support of Applicants' summary disposition motion.
Potential Biofouling Organisms at SHNPP
- 3. The SHNPP makeup reservoir is a freshwater impoundment. Contrary to allegations made in Contention 75, no marine crganisms capable of biofouling the SHNPP cooling systems will survive.in the Harris Reservoir. The only biofouling organism with the potential to reduce or block cooling water flow at the SHNPP is believed to be the Asiatic clam (Corbicula fluminea), a freshwater bivalve mollusk.
- 4. In response to NRC IE Bulletin No. 81-03 " Flow Blockage of Cooling Water to Safety Components by Corbicula sp. (Asiatic Clam) and Mytilus sp. (Mussel)," CP&L evaluated the potential for biofouling by these organisms at SHNPP. CP&L's replies to the NRC's request for information are attached as Exhibits "B" and"C". The NRC has not requested any further information related to biofouling from Applicants since those replies were submitted, c Biological Monitoring of Harris Reservoir
- 5. Beginning in February 1982, Applicants have conducted quarterly biological l sampling in the Harris Reservoir designed to monitor the benthic macroinvertebrate l
l community including the presence / absence of adult and advanced juvenile Corbicula clams. Sampling design included establishment of three permanent sampling transects -
l one each in the two main arms of th.e_ reservoir.(White Oak, Creek and Buckhorn Creek Branches) and one transect near the main dam. This design ensured that the three major areas of the main reservoir would be sampled, thereby increasing the probability of collecting Corbicula if they had been introduced.into the reservoir. Sampling design also included the collec[ ion of san.ples from both shallow and deep areas along each transect. This design insured that two different habitats (deep and shallow) would be
sampled at each location thereby reducing the possibility of not detecting the organism if.
it preferentially colonized one area over the other.
- 6. In '1983, two additional sampling transects were added to the above mentioned program. One transect is located in the main reservoir near the mouth of the cooling tower makeup intake channel The second transect is located in the auxiliary reservoir near the mouth of the emergency service water intake channel. Sampling at these two locations is conducted in the same manner and with the same frequency as sampling at the other transects mentioned above.
"l . Given the quarterly biological monitoring of lake bottom samples collected from the main and the auxiliary reservoirs, it is highly likely that any populations of Asiatic clams already established would have been detected promptly. Likewise, the ongoing reservoir monitoring program ensures the rapid detection of any Asiatic clam invasion of either the main or the auxiliary reservoirs. The early detection of such an invasion virtually eliminates the possibility that these organisms could enter plant service water systems prior to the initiation of appropriate plant biofouling inspection and control procedures.
Results of Biological Monitoring Efforts Completed to Date ,
- 8. No Corbicula adults or juverfiles have been detected in samples collected from February 1982 through May 1983.
- 9. In its commitments to NRC on reservoir monitoring, CP&L committed to increase ongoing benthic macroinvertebrate monitoring , efforts in the area of plant intake structures if a cla'm population were to be detected in the reservoirs. Tnis increase in monitoring effort has been implemented prior to any known clam invasion of either impoundment. Furthermore, CP&L has committed to an ongoing benthic macroinvertebrate monitoring, program desi ned to detect any established populations of these organisms. These monitoring studies will give a clear indication of any potential
biofouling problems due to establishment, of clam populations near plant intake structures. If a clam population is established.in the area of the intakes, CP&L has committed to the periodic sampling of intake bays behind the traveling screens. This sampling will detect any accumulations of living Asiatic clams, clam shells or other debris which could possibly be entrained and cause flow reductions upon entering the plant cooling water systems. This commitment to the early detection of any Asiatic clam invasion ensures that appropriate plant biofouling inspection and control procedures will be initiated prior to clam biofouling of cooling water systems. .
Plant Systems Designed to Prevent the Intrusion of Corbicula Fluminea
- 10. If and when Corbicula might become established in the Harris main and/or auxiliary reservoirs, the potential would exist for adults, larvae, and shells to be entrained into the service water system of the SHNPP. However, should this occur various design and operating conditions are expected to reduce the probability of flow reduction or blockage to safety system components by Corbicula.
- 11. No flow reduction or blockage problems should occur in the norrnal Service Water System (SWS). This system is designed to withdraw service water from the closed-loop Circulating Water System (CWS) at the cooling towers. Because the physical and chemical climate of the cooling towers will be unfavorable to Corbicula habitation; and because the service water is designed to be chlorinated to maintain a 0.5 ppm residual chlorine concentration at the heat exchanger outlet, Corbicula intrusion of the SWS is unlikely. ,
- 12. The Emergency service Water System (ESWS) will withdraw water from the auxiliary reservoir or, if that source is unavailable, from the main reservoir. From either .
source, the emergency service water will be pumped to the normal SWS. Because the ESWS pumps will be operated monthly, no accumulation of silt or Corbicula will occur in 1
the ESWS pipelines from the intake structure to the junction with the normal SWS.
m-Corbicula does not attach except in early larval stages, so any young adults that grow from larvae % hat settle there will be flushed through the system before growing large enough to reduce or block service water flow.
- 13. Potential for flow reduction or blockage in the SWS will result if there is an accumulation of silt and Corbicula adults and/or shells in the ESWS pump suction bays behind the traveling screens. (It is from these bays that the ESWS pumps withdraw cooling water.) The traveling screens' mesh size of 3/8" will prevent adults or larger shells from entering the ESWS intake bays. However, Corbicula in the larval or juvenile stages may be able to penetrate the small openings in the traveling screens and grow to adult size. Then, if significant buildups did occur in the bays, tne adults or shells could be picked up by the ESWS pumps suction. Two factors which will reduce the likelihood of there ever being high Corbicula densities in the intake bays are the water depth and the monthly operation of the service water pumps. At normal water level, the depth at the ESWS intakes on the auxiliary reservoir and main reservoir will be 60 feet and 30 feet, respectively. Low oxygen levels at these depths during summer months sh6uld inhibit occurrence and growth of Corbicula. The monthly operation of the ESWS pumps should minimize the buildup of silt in the intake bays and thus also minimize favorable substrate for Corbicula larvae to settle and gr'ow into adults. In ' addition, 1/16' self-cleaning strainers located at the discharge of the ESWS pumps would preclude any passage into the ESWS.
Asiatic Clam Monitoring Procedures Within Plant
- 14. Applicants intend to inspect key areas of the Harris plant to monitor for the presence of Asiatic clams. These key areas are most likely to include selected service water heat exchangers and selected vault areas 1:_ated directly behind the traveling screens (to be sampled for clams and debris). Also, various flow reduction tests and heat differential tests should be a reliable means to detect water flow blockages in several of the plant's water supply systems.
I .
- 15. These tests are designed to monitor plant service water systems for any flow reductions including those attributable to Asiatic clams.
Procedures for Controlling Asiatic Clams If They Gain -
Access to Plant Water Supply Systems
- 16. If the unfavorable physical and chemical climates present in plant cooling l water systems do not eliminate any clams which might enter the plant's service water syste.m, the application of continous chlorination to maintain a 0.5 ppm residual chlorine concentration at the heat exchanger outlet will effectively eliminate all adult and juvenile Corbicula from the system. This will prevent adult clams from reproducing within plant systems so that these organisms will not be able to develop an immunity to the above-mentioned chlorine concentrations.
- 17. Applicants consider continuous chlorination to be an effective biofouling control agent. The application of chlorine, however, would not preclude the use of other control strategies presently being developed or effectively employed by other utilities.
CONCLUSION 2
- 18. The "early warning" capability designed into our reservoir and plant monitoring procedures will allow sufficient time for any potential biofouling problems to be evaluated and controlled prior to the development of significant water flow reduction.
This the 8/d day of N df [,1983.
~
hES,,; d-William T. Hogarth '
Sworn to and subscribed, before me, this the 3i day of Md,1983.
-. .. . W
[ I dW yh My commision expires: $/8!87 I i Exhibit A WILLIAM T. HOGARTH
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Social Security No.: ..
Current Position: Manager Environmental Technology Section Carolina Power & Light Company Harris Energy & Environmental Center Route 1, Box 327 New Hill, North Carolina 27562 Telephone: (919) 362-3276 Home Address: ..-, . - - . - . . _ . . -
. ..y I. Personal Data Date of Birth: " - -
O Place of Birth: Jarratt, Virginia II. Education B.S.--University of fiichmond, Richmond, Virginia--1963 e, M.S.--University of Richmond, Richmond, Virginia--1965 Ph.D.--North Carolina State University, Raleigh, North Carolina--1976 Program for Technical Managers--University of North Carolina-1983 4
III. Experience in Higher Education Coordinator of General Biology Labs--University of Richmond Laboratory Assistant in Comparative Anatomy, Ichthyology, and Ecology--University of Richmond Graduate Research Assistant =Roanoke-Albemarle Striped Bass Project--
North Carolina-State University--1966-1972 Graduate Research Assistant--Chowan River Project--North Carolina State University--1966-1970 Research Assistant--Dolphin Aquadult.ure Project--North Carolina State Universitf '-1970-1972 f=
O IV. Honors Williams Fellowship--University of' Richmond Prhsident-Beta Beta Beta--University of Richmond Grant from Virginia Academy of Science for M.S. Research--
University of Richmond Treasurer--Phi Sigma Society-North Carolina State University Sport Fishing Institute Grant for Ph.D. Research Grant from North Carolina Wildlife Society V. Field Experience 1963-1965-Sampling of James River tributarles in connection with M.S. research.
1965-Chesapeake Biological Laboratory-seven months-striped bass project.
1966-1972--Graduate student in charge of Roanoke-Albemarle striped bass project.
1966-1970--Periodic, sampling of Chowan, Nottoway, and Blackwater Rivers.
c 1970-1972-Dolphin Aquaculture-Sea Grant Project-Hatteras, Bimini and Key West, Florida.
1966-Project on RV Eastward to determine feasibility of long-line fishing off Jamaica.
1967--Fishing expedition off San Juan to determine species abundance
- using long-line gear.
1973--Consultant to Roanoke-Albemarle project (March-May)--
Collecting data on spawning migration of striped bass and preparing annual report. - - '
1972-1980-Carolina Power & Light (CP&L) Company biologist -
Project Manager of Cape Fear Estuary Study--$8 million comprehensive study by CP&L, University of North Carolina, North Carolina State University, and ,outside investigators to determine
- impact of once-through power, plant. cooling system on Cape Fear Estuary a40atic giopulations.
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VI. Society Memberships Anterican Fisheries Society Anlerican Society of Ichthyologists and Herpetologists
' North Carolina Academy of Science Society of Power Industry Biologists VII. Current Technical Committees Southeastern Electric Exchange Environmental Committee-Vice Chairman Electric Power Research Institute Task Force on Environment '
North Carolina Wildlife Resources Commission-Striped Bass Steering Committee University of North Carolina--Water Resources Research Institute--
. Advisory Committee Vill. Certification ,
Certified Fisheries Scientist--American Fisheries Society IX. Current Responsibilities As the Manager of the Environmental Technology Section, I am responsible for the formulation and implementation of a broad variety of biological and scientific programs necessary to identify and quantify actual and potential environmental impacts associated With the construction and operation of fossil, hydro, and nuclear power plants. Responsibilities include providing (1) reports to various rege'a-tory agencies identifying the environmental impacts related to Company operations and (2) special technical expertise to, the Company in support of various Company activities. This expertise is provided by a staff of 47 professional engineers and scientists and 37 technicians. sWorking in four laboratories at the Harris Energy &
Environmental Center, this staff provides suppo'rt in materials sciences, analytical chemistry, air quality, and biological areas.
As Manager - Environmental Technology, I am also responsible annually for the planning and development .of the. annual operations and maintenance and constructiori budgets for the section. I modify l the scope of the budget as required to ensure that required programs are adequately funded and contingency funds are available for anticipated studies for the ensuing year. The budget for 1982 is over a $4 million.
Regulatory aequirements are the basis for most environmental programs and studies. conducted by the section. Satisfactory Company compliance with these requirements, at minimum cost, requires frequent and positive interaction with these regulatory agencies. The l
Manager - Environmental Technology maintains close working relationships with the Environmental Protection Agency, the United i
States Fish & Wildlife Service, the National Marine Fisheries Service, the Nuclear Regulatory Commission, and various divisions of the North Carolina Department of Natural & Economic Resources and the South l
- _ _ _ . _ __- - ~ . _ _ _ _._, ___.___ __,_ __ - - . __ _ _ _ -
Carolina Department of Health & Environmental Control to achieve satisf actory compliance. *
- AIManager ' Environmental Technology, I-am challenged to identify, as early as possible, pc,tential problems and/or opportunities in Company environmental compliance; - to analyze - and evaluate cornpliance alternatives considering not only ecology but also engineering, construction, generation, legal opinions, and regulatory behavior; and to effectively manage the inherent potential for misunderstood communications between biologists and engineers.
X. ; Publications and Technical Reports Hogarth, W. T. and W. S. Woolcott. 1966. The Mountain Stripeback Darter, Percina notogramma montuosa, N. sap. from Upper James River, Virginia. Chesapeake Science, 7(2):101-109.
Merriner,3. V., W. T. Hogarth and W. A. Foster. 1970. Occurrence of the Common Snook, Centropomus undecimalis (Block) (Pisces-Centropomidae)in North Carolina waters. The Journal of the Elisha Mitchell Scientific Society. 86(4):194-195.
Hassler, W. W., W. T. Hogarth and L. L. Liner, Ill. The status and abundance of the Striped Bass in the Roanoke River, North Carolina, for 1966.
Hassler, W. W., W. -T. Hogarth, L. L. Liner, III and H. S. Millsaps, Jr.
The status 'and abundance of the Striped Bass in the Roanoke River,
- North Carolina, for 1967.
Hassler, W. W., W. T. Hogarth and C. R. Stroud, Jr. The status and abundance of the Striped Bass in the Roanoke River, North Carolina, for 1968.
i e ~
Hassler, W. W. and W. T. Hogarth. The status, abundance, and exploitation of the Striped Bass in the Tar River, North Caronna, for 1969.
Hassler, W. W., W. T. Hogarth and C. S. Manooch. The status, abundance, and exploitation of the Striped. Bass in the Roanoke River and Albemarle Sound, North Carolina, for 1970.
Hassler, W. W., W. T. Hogarth and C. S. Manooch. .The status, abundance, and exploitation of the Striped Bass in the Roanoke River and Albemarle Sound, North Carolina, for 1971.
Hassler, W.- W., W. T. Hogarth and - C. S. Manooch. The status, abundance, and exploitation of the Striped Bass in the Roanoke River and Albemarle Sound, North Carolina, for 1972.
l I
Hassler, W. W. and W. T. Hogarth. 1977. The growth and culture of Dolphin, Coryphaena hippurus, in North Carolina. Acquaculture, 12 (1977).
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Hogarth, W. T. Biology of the Wahoo, Acanthocyblum solandri, off the North Carolina coast (in preparation).
\
Schwartz, Frank J., W. T. Hogarth and M. L. Weinstein. Marine and l freshwater fishes of the Cape Fear Estuary, North Carolina, and i their distribution in relation to environmental factors. Brimleyana i No. 7:17-37. July 1981. i i
Manooch, Charles S. III, and W. T. Hogarth. Stomach contents and !
giant Nematodes from wahoo, Acanthocyblum solanderi, collected !
along the South Atlantic and Gulf coasts cf the United States. ;
Bulletin of Marine Science,33(2):197-212,1983.
XI. Reports Responsible for a' t Carolina Power & Light Company Impingement Report--Brunswic'k Steam Electric Plant. January 1974-January 1975.
Brunswick Steam Electric Plant Borrow Pit Studies.1975.
H. B. Robinson 316 (a) and (b) Demonstration. 1976.
H. F. Lee 316 Demonstration.1978.
Cape Fear 316 Demonstration. '1977.
Brunswick Steam Electric Plant--Cape Fear Studies. A 20-volume report set on the effects of the operation of the once-through cooling system on the Cape Fear Estuary aquatic populations.
Bioassay Studies--Roxboro Steam Electric Plant.
Trace Element Studies--CP&L System.
Many other reports concerned with site selection studies and biological monitoring programs. t
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Exhibit B
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Carolina Power & Light Company July 10, 1981 Mr. J. P. O'Reilly Region II United States Nuclear Regulatory Co= mission 101 Marietta Street, NW Atlanta, Georgia 30303 SHEARON HARRIS NUCLEAR POWER PLANT UNIT NOS. 1, 2, 3, AND 4 ~
DOCKET NOS. 50-400, 50-401, 50-402, AND 50-403 IE BULLETIN 81-03
Dear Mr. O'Reilly:
As requested by IE Bulletin 81-03, " Flow Blockage of Cooling Water to Safety System Components by Corbicula sp. (Asiatic Clam) and Mytilus sp.
(Mussel)," Carolina Power & Light Company has evaluated the problem and its applicability to the Shearon Harris Nuclear Power Plant (SENPP). It has been determined that the potential for biofouling exists since the Asiatic clam is present in the vicinity of the etation. The results of seven consecutive years of field biological monitoring programs indicate Corbicula fluminea is present in the Cape Fear River.
Corbicula fluminea has also invaded Tortions of Buckhorn Creek, which is the primary water source for the main reservoir.
At present, field observations indicate that these class inhabit areas of Buckhorn Creek downstream of the main dam. There is no indication that the ,
clams are present in any area of the main reservoir nor are they present in any inflowing headwater streams, tr ,
The mussel (Mytilus sp.) does not inhabit any local environments and is probably restricted to coastal habitats which begin many river-miles downstream from the SHNPP.
Corbicula fluminea is expected to eventually be introduced into the l Shearon Harris Reservoir; however,.a.ny intr.oduction of class should be l
detected by the ongoing benthic macroinvertebrate monitoring program. Once a clam population is detected in the reservoir, macroir. vertebrate monitoring efforts will be increased in the area of plant intake structures. This monitoring will determine clam population dynamics including spawning periods and organism densities. These studies will give a clear indication of r
potential biofouling problems due to high clam densities near plant intake
! structures. At that- time, power plant pers'onnel will be informed that the potential for biofouling exists.
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411
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Fayettevnte Street
- P O Box 1551
- Raleign. N C. 27602
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Since at present SHNPP is still in the construction phasa and there is'no indication that the clams inhabit the reservoir, a control program other than environmental monitoring has not yet been finalized. Several control-measures are being evaluated and'upon' detection of Corbicula fluminea in the reservoir,'any protective actions deemed to be necessary will be acted upon.
our staff.
If you have any further questions on this subject, please contact Yo'2rs very truly,
/ l,/ .-
6E. E. Utley I.. / - y ExecutiveVicePresident}
Power Supply and Engineering & Construction ONd/je (N#64) cc: Director Office of Inspection and Enforcement U. S. Nuclear Regulatory Coca:tission Washington, D. C. 20555 Mr. E. Licitra (NRC)
E. E. Utley, having been first duly sworn, did depose and say that the information or based upon contained infor=ation herein and is belief.
true and correct to his own personal knowledge
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YA0 m.Y -- h ff"fdlarstsk.
Notary Publ
l th f,f My commission expires: ........,,.,
October 4, 1981 : / .
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( coo Exhibit C Carolina Power & Light Company
- MAR 251983 SERIAL: LAP-83-86 Mr. James P. O'Reilly, Regional Administrator United States Nuclear Regulatory Com=ission Region II 101 Marietta Street, NW, Suite 3100 Atlanta, GA 30303 d
SHEARON HARRIS NUCLEAR POWER PLANT UNIT NOS. 1 AND 2 DOCKET NOS. 50-400 AND 50-401
. IE BULLETIN NO. 81-03
Dear Mr. O'Reilly:
Water to Safety Components by Corbicula sp.As requested by IE Bu (Mussel)," dated December 10, ( Asiatic Clam) and Mytilus~ sp.
forth in our February 8,1983 letter, Carolina Power & Light 1982, and in ac submits, in the attachment to this letter, responses to the requestedCompany here additional information for the closing of the issue.
If you have any further questions on this, subject, please advise.
e Yours very truly, Original S:gned By
'NALTER J. HURFORO V. J. Hurford Manager Technical Services PS/ mag (6436PSA)
Attachment ec:
Mr. N. Prasad Kadambi (NRC) ~
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Mr. C. F. Maxwell - (NRC-SHNPP)
Mr. J. P. O'Reilly (NRC-RII)
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,, . . . . ~ ~ a s s .w. c '. . . -
411 Fayetteville Street e P. O. Box 1551
- Aa.eich. N. C. 27602 w n - m . , n_- - c w - ~ - -- -
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bec: Mr. H. R. Banks Mr. D. L. Bensinger ,
Mr. L. I. Inflin Mr. C, S. Bohanan Mr. R. L. Mayton, Jr.
Mr. J. R. Bohannon Mr. S. McManus Mr. C; Carmichael (2) Mr. C. H.- Moseley, Jr.
Mr. N. J. Chiangi Mr. R. M. Parsons Mr. A..B. Cutter Mr. J. J. Sheppard Dr. T. S. Elleman Mr. Sheldon D. Smith Mr. G. L. Forehand Mr. M. A. Weaver (Westinghouse)
Mr. J. F. Garibaldi (Ebasco) Mr. J. L. Willis Dr. W. T. Hogarth Mr. R. C. Yates Dr. J. D. E. Jeffries Mr. T. A. Baxter (Shaw, Pittman,
.Mr. 1. A. Johnson Potts & Trowbridge)
File: HI/A-2D File: H-X-0550 k
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REQUEST FOR ADDITIONAL INFORMATION IE BULLETIN NO. 81-03 '-
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- 1. (4 A)
No discussion of instrusion potential if and when Corbicula sp becomes established in reservoir. Please assess and respond.
Ih and when Corbicula sp. becomes established in the ahd/or auxiliary rese~rvoirs, the potential will exist for adults, larvae, and protection shells systems to be of the SHNPP.entrained into the service water and fire However, various design and operating conditions are expected to reduce the probability of flow reduction or blockage to safety system couponents by Corbicula sp .
No flow normal reduction Service or blockage Water System (SWS). problems are expected to result e in th This system is designed to withdraw (CWS) at theservice cooling water towers. from the closed-loop Circulating Water em Sys Because the physical and chemical ,
climate of the cooling towers will be unfavorable to Corbicula sp
, habitation; and because the service water is designed to be .
chlorinated the heat to maintain a 0.5 ppm residual chlorine concentration at probable. exchanger outlet, Corbicula sp.
intrusion of the SWS is not The Emergency the auxiliary Service reservoir or,Water if thatSystem (ESWS) will withdraw water from main reservoir. source is unavailable, from the be pumped to the normal SUS.From either source, the emergency service wat monthly, ESUS pipelines no accumulation from the intakt of silt or _Corbicula sp. will occur in th normal SWS. structure to the junction with the grow from larvae that_Corbicula sp. does not attach, so any young adults that
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before growing large enough to reduce or block service water flo .
The greatest result f rom the accumulation of silt and _Corbicula adults an shells in the ESUS pump suction bays behind adults or shells from entering the ESWS intake bays.T If significant buildups pumps occur, suction; the adults or shells would be picked up by tt; ESWS however, the discharge of the ESWS pumps to preclude passage into .
densities in the intake bays are the water depth a operation of the service water pumps.
At normal water level, the depth at the ESWS inEakes on the auxiliary reservoir and main reservoir levels at will be 60 feet and 30 feet, respectively. Lov oxygen and growth of _C_orbicula Th2 sp.these depths during sunmer months sh should minimize the ouildup of silt in the intake bays thus minimize favorable substrate for_Corbicula larvae to settle and grow into adults. ..
The potential intrusion by Corbicula sp. into the Fire Protection System (FPS) may be possible by makeup of vater containing larvae .
grow larvae The couldAlso, into adults. settleasin low points of the system where they may described for the ESWS. Corbicula adults
. and/or shells would be entrained f rom pos ible accumulations behind i _
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travelling Any adultsscreens or shellsatthatthe intake bays on the auxiliary reservoir .
enter or develop in the FPS could then reduce or block flow through small pipes, valves, or sprinklers.
Because of portions thetheFPS s pumps will be operated weekly for testing and because Corbicula larvae,ystem will be flushed as of ten as quarterly; and possibly adults and shells, would be entrained.
- 1. (4 b)
No information provided regarding planned control or detection methods.
Please respond and describe inspection procedures and control technology under consideration.
Because the potential for_Corbicula sp. Intrusion of the SWS, ESus and FPS exists, will be the following inspection procedures and control measures planned:
SMS and ESWS a.
During normal refueling outages, selected service water heat exchangers will be inspected for the presence of _Corbicula sp.
b.
The SWS will be chlorinated as described in 1.(4a) above if
_Corbicula SWS.
sp. or other biofouling is suspected or found in the c.
Once _Corbicula sp. are found in the reservoir during regular environmental monitoring of thy benthic macroinvertebrace populations, p,eriodic sampling'of the intake bays behind the travelling screens will be initiated. 4 d.
If significant densities of adults or accumulation of shells are found in the intake bays, periodic treatment of the bays with oxygen scavenging chemicals (e.g. , sodium metabisulfate (Na2233 0 )) will be initiated as required to control the Corbicula sp.
FPS '
a.
Low point blowdown drains will be used to periodically inspect i
the FPS for evidence of Corbicula sp.
b.
i Once _Corbicula sp. are-known to inhabit 'thi auxiliary reservoir,
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chlorination _ units will be installed at the intake pumps.
Chlorine would be injected consistant with pump operation.
c.
When Corbicula sp. are found in the auxiSary reservoir, the FPS intake bay behind the travelling screens will oc inspected and l _ treated as described for the' ESW'S intakes in (c) and (d) above.
- 2. (4 b)
No information proviacd regarding status of construction. Please respond and, procedures andif results.
any systems have been filled, describe inspection All fire protection systems have been filled and pressuri:cd as needed to protect equipment already installed. With the exception of fire protection, no piping associated with those systems of interest t
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are presently filled at SHNPP.
'Ihese systems may be filled for hydrostatic testing as early asL I4ay of 1983, and suosequently be (lushed,1984.
January drained. and thoroughly- inspected no earlier than !
3.a Provide last sampling date and results.
Quarterly sampling of the benthic community developing in the ilarris Reservoir1982.
November was conducted during February, May, August, and No Corbicula sp. were found in any of the samples reservoir.collected indicating that the clams are not in the main Sampling planned for 1983 will include two new stations.
One will be in the main reservoir near the mouth of the cooling tower makeup-
. intake channel, and the other will be in the auxiliary reservoir near the mouth of the emergency service water intake channel .
3.e See 1.(4b) above for planned corrective and preventive actions .
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f 5
C .
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(6436PSA : sag )
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