ML20198D162
| ML20198D162 | |
| Person / Time | |
|---|---|
| Site: | Nine Mile Point  |
| Issue date: | 05/16/1986 |
| From: | Mangan C NIAGARA MOHAWK POWER CORP. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-85-003, IEB-85-3, NMP1L-0058, NMP1L-58, NUDOCS 8605230173 | |
| Download: ML20198D162 (3) | |
Text
..
F Y NIAGARA n uMOHAWK NIAGARA MOHAWK POWER CORPORATl0N/300 ERIE BOULEVARD WEST, SYRACUSE. N Y.13202/ TELEPHONE (315) 4741511 May 16, 1986 NMPlL 0058 Dr. Thomas E. Murley Regional Director U.S. Nuclear Regulatory Comission Region 1 King of Prussia 631 Park Avenue King of Prussia, PA 19406 Re:
Nine Mile Point Unit 1 Docket 50-220 DPR-63
Dear Dr. Murley:
We have reviewed Nuclear Regulatory Comission Inspection and Enforcement Bulletin 85-03. This bulletin requested a program be developed and implemented to ensure that switch settings on certain safety-related motor-operated valves are selected, set and maintained correctly to accomodate the maximum differential pressures expected on these valves during both normal and abnormal events within the design basis. The bulletin addressed the High Pressure Coolant Injection / Core Spray and Reactor Core Isolation Cooling Systems.
The Nine Mile Point Unit 1 design does not include either High Pressure Core Spray or a Reactor Core Isolation Cooling System. Accordingly, tnat portion of the bulletin does not apply. Unit 1 has a High Pressure Coolant Injection System that is an operating mode of the Feedwater System; however, the Main Feedwater System has been specifically excluded by the Nuclear Regulatory Comission from the scope of this bulletin. Consequently, no motor operated valves at Nine Mile Point Unit i fall within the scope of the bulletin.
We have, however, an ongoing program of testing motor operated valves utilizing the Motor Operated Valve Analysis and Test System (comonly designated as M0 VATS) during refueling outages. M0 VATS testing previously performed and tests being done during this refueling outage include those valves which experience high differential pressures during operation. Current cutage tests are not complete, but early results have shown a substantial number of valves that required resetting of the torque Dypass switch. The torque bypass switches were reset to five (5) percent valve travel after the initial hamerblow which assures maximum operator thrust during the valve unseating stage, y
0 O
0 1
Dr. Thomas E. Murley Page 2 The results of valve tests will be reported 90 days after completion of the current refueling outage which is scheduled for mid-June 1986.
Very truly yours, 1
C. V. Mangan Senior Vice President CVM:LW/rla i
0778P
.f j
I 1
a s
+
3 r
er n---,
UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of
)
Niagara Mohawk Power Corporation
)
Docket No. 50-220 (Nine Mile Point Unit 1
)
AFFIDAVIT C. V. Mangan
, being duly sworn, states tnat he is Senior Vice President of Niagara Mohawk Power Corporation; that he is authorized on the part of said Corpcration to sign and file with the f;uclear Regulatory Commission the documents attached hereto; and that all such documents are true and correct to the best of his knowledge, information and Delief.
A h.k n. h A A a w
Subscribed and sworn to before me, a Notary Puglic in and for the State of New
/7Mydana
, this /6 day of #7/du
,1986.
York and County of 0
0 0 UldbtL Y Notary PuDlic in and for
/)/wdant County, New York 6
My Commission expires DeusimE AUSTill paese e the state elilm M m Onondaga Co; Yf,67 g was on ur --
,