ML20151L127
| ML20151L127 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 07/29/1988 |
| From: | Cockfield D PORTLAND GENERAL ELECTRIC CO. |
| To: | NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM) |
| References | |
| NUDOCS 8808030358 | |
| Download: ML20151L127 (2) | |
Text
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Portland General ElectricCompany 1
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David W. Cockfield Vice President, Nuclear
[I July 29, 1988 Trojan Nuclear plant Docket 50-344 License NFF-1 i
U.S. Nuclear Regulatory Commission ATTN:
Document Control Desk Washington DC 20555
Dear Sir:
p Supplemental Inforraation Concerning Inspection Open Item 50-344/87-34-10 This responso providos supplemental information concerning Portland General Electric's (PCE's) previous response to the subject item.
Correctivo action outlined in our letter of December 28, 1987 has been changed as described holow.
Part 1 of the subject open item, "Comploto Loss of Service Water Pumps Coincident With a Less of Offsite Power", concerns a flow test to demonstrate tho ability of the fire pumpu to provido water to the service water system hnador at the flow rate required by Emergency Firo Proceduro (EFP)
-2, "Alternative Shutdown for Complete Loss of Service Water Caused by Fire".
During the 1988 refueling outago, a flow test was satisfactorily performed to demonstrato this capability. Therefore, PGE. corrective action with respect to the situation doucribed in Part 1 of the subject open item is complete.
Part 2 of the s.ubject open item, "Use of Cooling Tower Basin as a Backup to the Service Water System", concerns demonstrating the adequacy of a makeup water supply to the coolin6 tower basin. When using the cooling tower basin us an alternative cooling water supply for the Servico Water System, makeup flow is required to the basin to complete the shutdown scenario. Further review of this scenario revealed in casos of high river sedimentation (eg, following volcanic activity from Ht. St. Ifolons) i the fire pumps may not be avellable to provido this makoup capability.
l Therefore, the same lineup as that utilized by EFP-2 could not be re-)iod
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upon to provide cooling tower basin makeup.
An alternative makeup water source from near the surface of the Columbia River, Reflection Lake, or
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Recreation Lake is necessary. The capability to provide makeup from the Columbia River _at the desired rate has been validated by actual testing.
e This -lineup required two pumper trucks in series drawing water from the Columbia River at the barge slip, using noncollapalble suction hoses and i
fire hoses. The equipment necessary to pump the water is available from the offsite fire department and is capable of being delivered and oper-ating well before the makeup flow is needed.
The makeup flow paths from the, lakes have been evaluated by field walk-down and should provide an acceptable alternative in the event water from the river is unavailable.
Actual flow tests will be performed by December 4 1, 1988.
All other corrective actions associated with this open item, including clarification of Final Safety Analysis Report Section 9.2.1. 3, outlined in our letter of December 28 1987, have been completed.
Sincere 1p, i
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Mr. John B. Martin Regional Administrator, Region V U.S. Nuclear Regulatory Commission Mr. Bill Dixon State of Oregon Department of Energy Mr. R. C. Barr NRC Resident Inspector Trojan Nuclear Plant l
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