PNO-III-98-025, on 980313,outage Extended Due to Util Decision to Melt 2.59 Million Pounds of Ice in Ice Condenser,Inspect Ice Condenser Components,Make Necessary Repairs & Fill Conndenser Baskets
| ML17335A482 | |
| Person / Time | |
|---|---|
| Site: | Cook  |
| Issue date: | 03/16/1998 |
| From: | Bruce Bartlett, Schweibinz E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III) |
| To: | |
| References | |
| PNO-III-98-025, PNO-III-98-25, NUDOCS 9901210021 | |
| Download: ML17335A482 (2) | |
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CATEGORY 1y REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)
ACCESSION IPR:9901210021 DOC.DATE: 98/03/16 NOTARIZED: NO DOCKET FACIL:50-315 Donald C.
Cook Nuclear Power Plant, Unit 1, India'na M
05000315 50-316 Donald C.
Cook Nuclear Power Plant, Unit 2, Indiana M
05000316 AUTH.NAME AUTHOR AFFILIATION BARTLETT,B.
Region 3
(Post 820201)
SCHWEIBINZ,E.
Region 3
(Post 820201)
RECIP.NAME RECIPIENT AFFILIATION
SUBJECT:
PNO-III-98-025:on 980313,outage extended due to util decision to melt 2.59 million pounds of ice in ice condenser, inspect ice condenser, components, make necessary repairs E fillconndenser baskets.
DISTRIBUTION CODE: IE34F COPIES RECEIVED:LTR ENCL SIZE:
TITLE: 50 Docket 6 Vendors. PNO/Non-Routine Event/Safeguards Event (PN)
NOTES:
RECIPIENT ID CODE/NAME FILE CENTER OCS "FULL TXT RES/DET/EIB RES/DST RES/RPHEB EXTERNAL: LITCO BRYCE, J H NRC PDR COPIES LTTR ENCL 1
1 1
1 1
RECIPIENT ZD CODE/NAME NRR/DRPM/PERB OE DZR RES/DRA/DEPY RES/DST DEPY RGN3 FILE 01 NOAC COPIES LTTR ENCL 1
11' NOTE TO ALL "RIDS" RECIPIENTS:
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ON EXTENSION 415"2083 TOTAL NUMBER OF COPIES REQUIRED:
LTTR ENCL 13
March 16, 1998 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-III-98-025 This preliminary notification constitutes EARLY notice of events of POSSIBLE safety or public interest significance.
The information is as initially received without verification or evaluation, and is basically all that is known by Region III staff (Lisle, Illinois) on this date.
Facility Indiana Michigan Electric Co.
Cook 1
2 Bridgman, Michigan Dockets:
50-315,50-316 Licensee Emergency Classification Notification of Unusual Event Alert Site Area Emergency General Emergency X
Not Applicable
Subject:
,OUTAGE EXTENDED TO MELT ICE AND INSPECT UNIT 1 ICE CONDENSER On March 13,
- 1998, the licensee informed Region III (Chicago) that it had decided to melt 2.59 million pounds of ice in the Unit 1 ice condenser, inspect the ice condenser components, make any necessary
- repairs, and then fillthe condenser baskets with fresh ice.
The ice condenser system consists of 1944 baskets, each 45 feet high, filled with ice. In the event of' loss-of-coolant accident, the ice condenser system would condense steam released into the reactor containment to reduce the pressure and avoid damage to containment structures.
The decision was made after debris was found in ice melted from 110 ice baskets as part of the licensee's ongoing inspection and repair of the baskets.
The debris, including wood, plastic, wire, and other items, would have the potential to affect the flow of water in the containment sump when cooling water was recirculated from the sump to the reactor cooling system following an accident.
The licensee has been inspecting the ice condenser system and making necessary repairs as a result of NRC inspection findings in February 1998 (Reference PNO-IIZ-98-18). Between 80 and 100 ice baskets have been repaired or replaced thus far.
The decision to melt the ice affects only Unit 1; the licensee will make a decision on Unit 2 after further review.
The licensee is currently developing its plans and schedule for the ice removal and inspection activities.
Once the ice is melted and the ice condenser system is inspected, the licensee will begin replacing the ice.
The licensee is evaluating other sources of ice to supplement the ice-making capacity of its current system.
The ice replacement and ice condenser inspections and repairs will be monitored by the resident inspectors and the Region III staffs The State of Michigan will be informed.
The information in this preliminary notification has been reviewed with licensee management.
The licensee informed Region III of its decision to melt and replace the ice on March 13, 1998. This information is current as of 11:30 a.m.
(CST) on March 16, 1998.
Contact:
BRUCE BARTLETT (616)465-6775 9901210021 980316 PDR X5E PNO-XXX-'PS-025 PDR ED SCHWEIBINZ (630)829-9712