ML20070S450
| ML20070S450 | |
| Person / Time | |
|---|---|
| Site: | Sequoyah  |
| Issue date: | 03/29/1991 |
| From: | Wallace E TENNESSEE VALLEY AUTHORITY |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| NUDOCS 9104020295 | |
| Download: ML20070S450 (3) | |
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lennouce Vufley Authorny 1101 Mrket Street, Chattrega, Tennnsee 37402 MAR 291991 U.S. Nuclear Regulatory Commission ATTN Document Control Desk Washington, D.C.
20555 Centlement In the Matter of
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Docket Nos. 50-327 Tennessee Valley Authority
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50-320 SEQUOYAH NUCLEAR PLANT (SQN) - REVISED COMPLETION DATE FOR ESSENTIAL RAW COOLING WATER (ERCW) TEMPERATURE CONTROL VALVE REPLACEMENT COMMITMENT - NRC INSPECTION REPORT NO. 50-327, 328/87-73
References:
1.
TVA lotter to NRC dated January 19, 1990, "Sequoyah Nuclear Plant (SQN) Units 1 and 2 - NRC Inspection Report No. 'J-327, 328/87 Revised Completion Dato for Essential Raw Cooling Water (ERCW) Temperaturo Control Valve Replacement Commitment and Revision of Ground Fault Detection on the 480-Volt l
Auxiliary Power System Commitment" 2.
TVA letter to NRC dated September 26, 1988, "Sequoyah Nuclear Plant (SQN) - NRC Inspection Report Nos. 50-327/87-73 and 50-328/87 Supplomontal Response" l
The commitment completion date for modifying the ERCW temperature control valves for reliable automatic operation was initially December 31,-1989, and was revised to March 29, 1991, by Reference 1.
Sinco Reference I was submitted, the ERCW temperaturo control valvos for the shutdown board-room chiller packages woro modifled by Design Change Notico (DCN) M00618A.
However, materials required to modify the main control room and electrical board room chiller packages were not received in timo to support the March 29 commitment completion date.
The modification schedules have boon revised based on material delivery schedules; the ERCW tempercture control valve modifications will be completed by June 3, 1991.- It should also.be noted that the remaining four valves will be modified in accordanco with DCN M03442A, as l
opposed to DCN K00222, which was referred to in the references.
The DCN l
number for the modification was changed when the actual design approach for the modification was revised.
l 9104020295 910329 g_acocko5 27 40, W
MAR 291991 2
U.S. Nuclear Regulatory Commission The revised commitment is provided in the enclocuro.
If you have any questions concerning this submittal, please telepbone Russell R. Thompson at 615) 843-7470.
Very truly yours, TENNESSEE VA1. LEY AUTHORITY 4
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. ace, M nager Nucioar censing and Regulatory Affaire Enclosure cc (Enclosure):
Ms. S. C. Black, Deputy Director Project Directorato 11-4 U.S. Nucioar Regulatory Commission One h ite Flint, North 11555 Rockvillo Pike Rockvillo, Maryland 20852 Mr. J. N. Donohew Project Manager U.S. Nuclear Regulatory Commission One White Flint, North 11555 Rockvillo Pike Rockville, Maryland 20852 NRC Resident Inspector Sequoyah Nuclear Plant 2600 Igou Ferry Road Soddy Daisy. Tennesseo 37379 Mr. B. A. Wilson, Project Chief U.S. Nuclear Regulatory Commission Region 11 101 Marietta Street, IN, Suite 2900 Atlanta, Coorgia 30323 l
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ENCLOSURE The main control room and electrical board room chiller package essential raw cooling water temperature control valves will be modifled to provide reliable automatic operation by June 3, 1991, I
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