ML20096G804
| ML20096G804 | |
| Person / Time | |
|---|---|
| Site: | McGuire, Mcguire  |
| Issue date: | 05/13/1992 |
| From: | Mcmeekin T DUKE POWER CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| GL-89-13, NUDOCS 9205270009 | |
| Download: ML20096G804 (3) | |
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7-liuke (wr Com; arty T C Kutwr AkCwer Nuclect Generation inpartment lice hesident
- I?iM llagm kny Road (alG01A)
(704)$75-4F00 ilun'mn:le, NC2Fo!M9AS.
- (704]S75 4SC9 fu DUKE POWEft May 13,1992 U.S Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 2055i
Subject:
McGuire Nuclear Station, Units 1 and 2 Docket Nos. 50-369 and 50-370 Supplemental Response #2 Ref: Generic Letter 89-13 This is the second Sbpplemsntal Hesponse to NRC Generic Letu 89-13, Service Water System Problems Atlectino Safety-Rs!ated Equipment. The first supplemental response dated November 19, 1990, provided a schedule for completing modifications required to flush infrequently used cooling soops, as specified by Action I of the Generic Letter.
This Supplement updates the schedule provided in 'he first Supplement and addresses the tet'owing elements.
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Surveillance and Con rol i
11 Test Program lll Inspection ano Maintenance Program IV Confirmation of Licensing Basis V
Procedures and Training i
MODIFICATIONS TO ALLOW FLUSHING ASSURED MAKE-UP PIPING Component Cooling Water system modifications have been delayed di:c to changing the design l
scope. The scope has been increased to include additional equipment that would provide confirmation of Design flow capability. Also, modification changes would fulfill recently identified IWV testing requirements associated with check valves a the assured make-up lines to the Component Cooling L
system.
Spent Fuel Pool Cooling system modifications have also been delayed due to changing the design scope. The scope has been increased to include additional equipment that would provide confirmation of Design flow cape.bility.
920S270009 920513 PDR ADOCK 05000369 f-
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Docu, ment Cbntrol Desk May 13,1992 Page 2 Auxiliary Feedwater system and Diesel Generator Engine Cooling system modifications have been canceled. Recent internal piping inspections confirmed earlier inspection findings. Those inst cctions i
did not reveal sedimentation or macro-fouling present in these sections of piping. In sodition, a review of piping configuration and service conditions showed that these lines are nei prone to sediment buildup.Therefore, modifications to allow flushing these system's assured make-up lines will not be implemented. However, these lines will continue to be inspected on a periodic basis.
l Following is the revised schedule for the modifications to the assured make-up for the above systems.
SYSTEM Unit 1 Unit 2 Component Cooling Summer 1994*
Fall 1994*
i Spent Fuel Pool Cooling Fall 1993" Fall 1993" l
Auxiliary Feedwater Canceled Canceled Diesel Generator Cooling Water Cancelad Canceled These modifications will be installed during the EOC9 refueling outages.
These modifications will be installed while the units are on-line.
11 BIOCIDE ADDITION PROGRAM The low dissolved oxygen content of the source water for the McGuire intake discourages significant Asiatic clam accumulation. However, to address potential future biofouling problems, McGuire planned -
to assess biofouling control alternatives evaluated in the Catawba Nuclear Station study. At the time of our November 19,1990 supplemental response, the biocide addition program required by Action 11 of the Generic Letter was pending the results of a pilot progam at our Catawba plant. Inis status is unchanged at this time. The Catawba study has been unsucoessful due to discnarge limitations, and is pendir g a revised discharge permit. However the intake structure inspection program has been established and will pavide some indication of biotouling to the Nuclear Service Water system.
- 111 PIPING INSPECTION AND REPAIR PROGRAMS Established as desenbed in the letter to the NRC dated November 19,1990.
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.Docurnerst control Desk May 13,1992 Page 3 IV COMPONENT COOLING SYSTEM TEMPEriATURE RISE The review of Component Cooling system temperature rise during a reactor coolant pump thermal barrier isolation valve failure described in the November 19,1990 supplemental response, has been completed. The Component Cooling system procedures have been reviewed for applicabiaty. One Emergency Procedure and One Abnorrnal Procedure will be revised to instruct the operator to isolate the Component Cooling side of the thermal barriers in the event of a thermal barrier isolation valve failure.
V PROCEDURES AND TRAINING Established as described in the letter to the NRC dated November 19,1990.
For questions please contact Kr.thleen Mullen at (704) 875-4302.
I declare under penalty of perjury, thst the stataments set forth herein are true and correct to the best of my knowledge.
Very truly yours, L
T. C. McMeekin
-xc: Mr. S.D. Ebneter, Regional Administrator U.S. Nuclear Regulatory Commissi-, Region 11 101 Marietta St. NW, Suite 2900 Atlanta, Georgia 30323 Mr. Tim Reed, Project Manager U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation WPshington, D.C - ?0555 Mr. P.K. Van Doorn NRC Senior Resident inspector McGuire Nuclear Station
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