ML20028G872
| ML20028G872 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 08/24/1990 |
| From: | Chrzanowski R COMMONWEALTH EDISON CO. |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| RTR-NUREG-1150 NUDOCS 9009050249 | |
| Download: ML20028G872 (1) | |
Text
p
. Commonwealth Edison 1400 Opus Place
/ Downers Grove, Illinois 60515 August 24, 1990 x/
r U.S. Huelear Regulatory Commission Document Control Desk washington, DC 20$$5
Subject:
Zion Station Units 1 and 2 Commitment to Provide a Backup Water Source to the Charging 011 Coolers IlhC_D2r.Att_J1cs. 50-22 Land 50-3M i
t
{
References March 13, 1989, letter from Cordell Reed to T.E. Hurley r
Gentlement HUREG-1150, ' Severe Accident Risks:
An Assessment for rive U.S.
Nuclear Power Plants, indicated that Zion Station may be at some greater risk than other nuclear plants due to a postulated loss of Component Cooling Water.
This postulated event would eliminate cooling water to each RCP's Thermal Barrier and to each Charging Pump's oil cooler, potentially resulting in leakege through the RCP seals.
In reference (a), Commonwealth Edison made three commitments to address this issue. The status of those commitments is as follows:
1)
Zion Station provided an au '11ery water supply to each Charging Pump's oil cooler via the f
- Protection System.
- Hoses, fittings, and tools eit-sy available at each Unit 's
.or immediate hook up to existing Charging Pump area ally taps on the oil coolers.
required.
This action was completed in April 1989.
2)
A formal procedure change was made to AOP 4.1, titled Loss of Component Cooling, on April 12,1909, providing instruction to the operatore to align emergency cooling to the centrifugal charging pumps. Specific instructions are included for each charging pump with a diagram of the lube oil cooling valves and piping.
3)
As of May 3990, the new heat resistant RCP Seal O-rings were unavailable from Westinghouse. Therefore, during the latest Unit outages, the RCP Seal 0-rings were not replaced.
When the new O-rings are available, the existing O-rings will be changed out when each pump is disassembled for routine scheduled seal maintenance.
The actions taken provide a backup water source to the Zion Station Chatging Pump oil coolers.
Very truly yours, (NYY R.
A.
rranowski fluclear Licen ing Administrator cc:
D.F.
Rose C.
Patel - NRR Zion Resident Inspectot gq 3
Region III Office V v.1,,,,)
0441T:095 9009050249 900824 l
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