ML20009D832
| ML20009D832 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 07/09/1981 |
| From: | Rhode G NIAGARA MOHAWK POWER CORP. |
| To: | Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-81-03, IEB-81-3, NUDOCS 8107240393 | |
| Download: ML20009D832 (5) | |
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t M Y NIAGARA RUMOHAWK NIAGARA MOHAWK POWER CORPORATION /300 ERIE BOULEVARD WEST, SYRACUSE, N Y.13202/ TELEPHONE (315) 4741511 A p } W lll' %
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July 9,1981
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Office of Inspection and Enforceaent Region I Attention: Mr. Boyce H. Grier, Diractor U. S. Nuclear Regulatory Connission 631 Park Avenue King of irussia, PA 19406
Dear Mr. Grier:
Re: lline title Point Unit 2 Docket No. 50-410 Attached is the infomation requested in your I.E.Bulletin 81-03 dated April 10,1981 for Nine liile Point Unit 2.
Per your request, approximately 235 man-hours were' required in the review and preparation of the infomation required by this Bulletin.
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Very truly yours, NIAGARA 110 HAWK POWER CORPORATION
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ra d K. Rhode Vice President l
Systea Project fianagement PEF:ja xc: Director Office of Inspection and Enforcement
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l U. S. Nuclear Regulatory Connission Washington, D. C. 20555 S
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8107240393 810709 PDR ADOCK 05000410 G-PDR
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STATE OF llEll YORK
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COUllTY OF Oll0!1DAGA- )
GERALD K. RHODE, being duly sworn says:
I an Vice President, Systen Project flanagement of liiagara liohawk Power Corporation.
I have read the foregoing 1etter and attachment, and the information contained in the letter and attachment is true to the best of my knowledge, information and belief.
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erald K. Rhode Sworn to before ne on thic 95-day of July,1981
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/<S' IIAZEL J. CARHit.K Notary Public in the $ tate of New Yorir Qualified sei Oiiosi. W No. 4.244W W Commisam tysm Wrrh 30,19 EA.
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NIAGARA M0 HAWK POWER CORPORATION c
NINE MILE POINT UNIT 2 DOCKET NO. 50-410 Response to I. E.Bulletin 81-03 Flow Blockage of Cooling kater to Safety System Components by Corbicula sp (Asiatic clam) and Mytilus sp (mussel)
ACTIONS TO BE TAKEN BY CONSTRUCTION PERMIT HOLDER Request:
1.
Detemine whether Corbicula sp. or Mytilun sp. is present in the vicinity of the station by completing items 1 and 4 above that apply +,o operating licenses (OL).
Response
1.
a.
Mytilus sp.
' The mussel (Mytilus sp.) is a marine and estuarine species found in salt water envirogments only. Therefore, it would not be found in the Great Lakestl e.
b.-
Corbicula sp.
Recent benthic studies have not produced evidence for the presence of Corbicula sp. (Asiatic cica) in Lake Ontario near the Unit 2 siteuf. Based on a review of existing literature, the northern limit-of this species in the Atlantic drainage is the Delawgrg River i
between Philadelphia, Pennsylvania, and Trenton, New Jerseyt3s, The. northern limit in the Mississipg drainage is the Upper MississippiRiveratLansing,IowaL9{1 The presence of Corbicula i
sp. in the Great Lakes has not been reported in the literature.
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Conversation;Si,yith regional experts indicate that the species is not in this areat i
In addition to the above, an ecological assessment was perfomed on
.May 9,1981 to detemine if Corbicula sp. was present in the source
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cooling water to be used for Nine Mile Point Unit 2.
Mytilus sp. was not reviewed since this genus is associated with salt water environments. This assessment entailed benthic surveys to the east i
and. west of the Site and near the inlet and discharge structures and l
in the inlet forebay of Unit 1.
The results indicate that there is no evidence of Corbicula sp. in the Unit 2 source cooling water.
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Therefore,.it does not pose a biofouling problem.
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' Request:
2.
If-these organisms are present in the local environment and potentially affected systems have been filled from the station source or receiving water body, determine whether infestation has occurred.
Response-1Not applicable. -
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Request:
3.
Describe the actions taken in items 1 and 2 above for constructica permit holders and include the following information:
a.
Applicable portions of the environmental monitoring prograa including last sample date and results.
b.
Components and systems affected.
c.
Extent of fouling if any existed.
d.
How and when fouling was discovered.
e.
Corrective and preventive actions.
Response
3a. See the rerponse to Item 1 above.
3b, c, d & e. Not applicable.
Request:
4.
Describe methods either in use or planned (including faplementation date) for preventing and detecting future flow blockage or degradation due to clans or aussels or shell debris.
Include the following information in this description:
a.
Evaluation of the potential for intrusion of the organisas into these systems due to low water level and high velocities in the intake structure expected during worst case conditions.
b.
Evaluation of effectiveness of prevention and detection aethods used in the past or present or planned for future use.
Response
Corbicula sp. is not expected to be present at Unit 2.
However, if it is ever reported in the Nine Mile Point area, or it is found during the inspection of components or systems vulnerable to fouling, control measures will be instituted. Components and systems filled with raw lake water will be aonitored to detect any flow restrictions.
There is a low probability of intrusion of the organisms into vulnerable plant systems, due to low water level and high velocities in the intake structure.
Lake Ontario has a history of very slight water level fluctuations.
Therefore, it is unlikely that a low water level condition will exist in the future.
If substantial flow loss is noted, major components will be checked during planned plant outages for any possible entrapnent.
The Unit 2 service water system is designed with the capability to test every component for flow blockage. Flow elements have been provided on the aajor components cooled by service water. All other components have appropriate pressure test connections to measure the differential pressure across them.
Any flow blockage in the Unit 2 service water system should be detected before the system efficiency is reduced significantly.
REFERENCES 1.
Goener, E. L.
Guide to Identification of Marine and Estuarine Invertebrates: Cape Hatteras to the Bay of Fundy. Uiley-Interscience, New York. 1971, 693 p.
2.
Texas Instruments Incorporated, Ecological Services.
1979 Nine Mile Point Aquatic Ecology Studies.
Prepared for Niagara Mohawk Power Corporation and The Power Authority of the State of New York.
1980,173 p.
3.
Fuller, S. L. and Powell, Jr. E. E.
Range extensions of Corbicula maneleusis (Philippi) in the Atlantic drainage of the United States.
Nautilus 87(2):5; 1973.
4.
Eckblad, J. E.
The Asian clan Corbicula in the Upper Mississippi River.
Nautilus 89(1):4 1975.
5.
Mackie, J.
Department of Zoology, Guelph University, Guelph, Ontario, Canada. Personal coamunication in telephone conversation with Mary Ellen H. Bakken (S&W) May 15, 1981.
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