ML19346A346

Responds to IE Bulletin 81-03, Flow Blockage of Cooling Water to Safety Sys Components by Corbicula Sp (Asiatic Clam) & Mytilus Sp (Mussel). Corbicula & Mytilus Are Not in Vicinity.Methods of Detecting Flow Blockage Will Continue

ML19346A346
Person / Time
Site:	Kewaunee
Issue date:	05/26/1981
From:	Mathews E WISCONSIN PUBLIC SERVICE CORP.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
CON-NRC-81-80 IEB-81-03, IEB-81-3, NUDOCS 8106190182
Download: ML19346A346 (3)

Text

o . 1 hRC-81-80 WISCONSIN PUBLIC SERVICE CORPORATION P.O. Box 1200, Green Bay, Wisconsin 54305 f.m ,

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/4 May 26, 1981 -

,% !4 s b JUi 2 3 EW d Mr. J. G. Keppler, Regional Director

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~~ u.s.LdEM we ~r6 %D Office of Inspection & Enforcement s Region III . [D g U. S. Nuclear Regulatory Commission

• 4 iM 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Mr. Keppler:

Docket 50-305 Operating License DPR-43 IE Bulletin 81-03: Flow Blockage of Cooling Water to Safety System Components By Corbicula SP (Asiatic Clam) and Mytilus SP (Mussels)

The following discussion addresses the cancern of the referenced bulletin. The numbering is consistent with that of the bulletin " action items". Only items 1, 4 and 5 are applicable to Kewaunee Nuclear Power Plant.

1. In accordance with the requirements of lE Bulletin No. 81-03, an investi-gation was undertaken by our corporate environmental staff to determine whether this bulletin was applicable to the Kewaunee Nuclear Plant. The results of that investigation indicate that the species Corbicula (Asiatic Clams) 10 a c present in the vicinity of our station's receiving water.

Mytilus (Mussels) species is a marine species and is not native to and will not be fotad in Lake Michigan (fresh water) . Consultation with Wisconsin Electric Power Company, operators of the Point Bec.ch Nuclear Plant which is in the same vicinity as Kewaunee Nuclear Power Plant, has confirmed our results.

4. The present methods of detecting flow blockage or degradation due not only to clams, or shell debris but to any debris will be continued in the future.

These methods include:

(1) Porebay Inspection <$lI 7 '

The Kewaunee Plant har a Preventative Maintsnance Program to conduct h' O -

a forebay inspection every five years. This includes insper; ting for the acetsmulation of debris, organic growth and any abnormal indications.

81061.Do W 4AY 2 8 1981

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'Mr. J. C. Kappler May 26, 1981 Page 2 J i

(2) Treventative Maintenance Procedure (PMP 4-5) Circulating Water Pump Inspection The circulating water pump inspection would detect degradation, es indicated by the following excerpt:

Section 4.2 Pusep Inspection 4.2.4 Remove the nanhole cover from the volute casing.

4.2.5 Check inside the volute for indications of wear or malfunctiot. . . . .

The inspection is done te one pump each year.

(3) Preventative Nbintenance Procedure (PMP 4-2) Main Steam condenser Insoection The condenser inspection consists partially of the following:

Section 4.1 Wa,terbox and Tube Sheet Inspection 4.1.1 Insnect the waterboxes and tube sheets for accumulation of debris and scale deposits; clean if required.

4.1.2 Inspect the tube sheet for organic growths, clean if required.

This inspection is done yearly.

4a. The Kewaunee Nuclear Power Plant circulating water intake structure is located approximately 1600 feet from the shore in a water depth of 15 feet. Therefore, water level considerations are not applicable. The fluid velocity in the intake structure is less than one foot per second at full load conditions.

Based on these design features, and the absence of these types of organisms, intrusion of crganisms into the plant through entrainment in the circulating water is not considered to be of significant concern. The circulating water intake structure is discussed on page 10.2-11 of the Kewaunee FSAR.

4b. The effectiveness of the prevention and detection methods used at Kevaunee Nuclear Power Plant is evident in the inspection results that we have obtained.

For example, during the five year forebay inspection, only about two wheel-barrws of silt, sediment, and debris was found. There was very little organic l growth. Good results have also been obtained in the inspections of the cir-l culating water pump volutes and condenser.

l Sa. The last inspection of the condenser and one circulating water pump volute was made in May 1981; the forebay was last inspected during the refueling outage in the spring of 1979. No fouling was discovered in either case.

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.5c. No fouling was discovered.

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Mr. J. G. Keppler o May 26, 1981 Page 3 3e. Preventive actions are discussed above. No corrective actions have been necessary.

Very truly yours, teRda E. R. Mathews Senior Vice President Power Supply & Engineering jac cc - Mr. Steven Varga, Director, Office of Inspection and Enforcement, U S Nuclear Regulatory Comission Washington, D. C. 20555 Mr. Robert Nelson, MtC Resident Inspector RR #1, Box 999, Kewaunee, WI 5427.6 Subscribed and Sworn to hicre Me This 26th Day of !by 1981 nb Notary Puolic, State 3f Wisconsin

- My Comunission Expires

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