ML20078D721
| ML20078D721 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 09/16/1983 |
| From: | Tucker H DUKE POWER CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| References | |
| REF-SSINS-6820 IEB-81-03, IEB-81-3, NUDOCS 8310040599 | |
| Download: ML20078D721 (2) | |
Text
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DUKE POWER Gox%Bic PUmN.'I P.O. HOx 33189,
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,t CHAMLOTTE. N.C. 281149 '
HALB. TUCKER TELEPHONE (704) 373-4531 wwm emenspen, September 16, 19 g,
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Mr. J. P. O'Reilly, Regional Administrator U. S. Nuclear Regulatory Commission Region II 101 Marietta Street, NW, Suite 2900 Atlanta, Georgia 30303
Subject:
Catawba Nuclear Station Docket Nos. 50-413 and 50-414 IE Bulletin 81-03
Dear Mr. O'Reilly:
Please find attached a supplement to our response of March 17, 1983 concerning IE Bulletin 81-03,-flow blockage of cooling water to safety components by Corbicula sp. (Asiatic clam) and Mytilus sp.
(Mussel).
Very truly yours, G
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Hal B. Tucker RWO:dyh Attachment cc: NRC Resident Inspector Catawba Nuclear Station Palmetto Alliance 21353s Devine Street Columbia, S. C.
29205 Robert Guild, Esq.
Attorney-at-Law P. O. Box 12097 Chacleston, S. C.
29412 031 M N $ob 3
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'JP0/HBT/RWO Septembzr 16, 1983 - (A1) c L
s DUKE POWER COMPANY CATAWBA NUCLEAR STATION Item 1:
(4b.)-
'In our previous response we were to monitor on a_ quarterly basis.two heat exchangers in the Nuclear Service Water System by setting a reproducible flow through the heat
-exchanger and recording the inlet and outlet' pressures. The two heat exchangers are
-the Containment Spray Heat' Exchanger (18" piping) and the Auxiliary Shutdown Panel' Air Conditioning Unit' Condenser (1" piping). These'two components are not well L
suited for this. monitoring and we suggest substituting these with a Component Cool-L ng. Heat Exchanger (24" piping) and a Diesel Generator Starting Air Aftercooler. (l" 1
i P P ng).
ii The justification for _ monitoring a Component Cooling Heat Exchanger rather = than a Containment Spray Heat Exchanger-is that the' Containment Spray Heat Exchanger will be kept in a wet layup -state during plant. operation. Since _ the Containment Spray Heat Exchanger -is' normally isolated.with inlet. and outlet valves closed when in standby = alignment,sua can' fill it with demineralized, deaireated and possibly chemi-cally treated water.. This will minimize or even prevent clam infestation in this heat exchanger.- The Component Cooling Heat Exchanger is of comparable size and will always be filled with raw water.
The-justification for testing the Diesel Generator Starting air aftercooler rather than an' Auxiliary Shutdown Panel Air Conditioning Unit Condenser is that a reprodu-4 cible flow through the ASP Condenser is difficult to obtain. To establish a set flow would require shutdown of.the unit, which is always'in service, and' adjusting flow with the manual bypass valve. The Diesel Generator Starting Air Aftercooler j
should always.have 12.5 gpm without any system realignment.
l l
Item 3.a:
i The. final report concerning. the _Corbicula infestion study was to be made available -
by June -1983. : This report is currently in the final stages of analysis. and compi-lation and will now be available by November 1, 1983.
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