ML18141A328
| ML18141A328 | |
| Person / Time | |
|---|---|
| Site: | Surry  |
| Issue date: | 01/20/1984 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | Harold Denton, Varga S Office of Nuclear Reactor Regulation |
| References | |
| 037, 37, NUDOCS 8401270233 | |
| Download: ML18141A328 (4) | |
Text
L VIRGINIA ELECTRIC AND POWER COMPANY RICHMOND, VIRGINIA 23261
- w. L. STEW.A.nT VICE PRESIDENT NUCLEAR OPERATIONS Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation Attn:
Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing U. S. Nuclear Regulatory Commission Washington, D.C.
20555 Gentlemen:
January 20, 1984 Serial No.: 037 PSE/BSD:cdk:OOlON Docket Nos.
50-280 50-281 License No.
DPR-32 DPR-37 GENERAL DESIGN CRITERIA 17 ANALYSIS SURRY UNIT NOS. 1 AND 2 The purpose of this letter is to provide a status report of our progress on resolving the rerating of motor operated valves (MOVs) and our plan for further work as committed to in our [[letter::05000280/LER-1983-043-03, LER83-043/03L-0:on 830914,following Reactor Trip,Flow Control Valve (FCV) Failed to Close Upon Receipt of Feedwater Isolation Signal.Caused by Malfunctioning Solenoid Valve & FCV-1488 Restricted by Antirotation Device|October 14, 1983 letter]], Serial No. 556.
We have obtained verified torque requirements on all valves.
A complete review of the alignment of valves in the plant and the control circuitry for each MOV has determined that 52 of the original 84 MOVs will not need to operate in an emergency when the voltage on the 480 volt bus is below 90% of the MOV rated voltage.
An additional 10 MOVs were added to the list based on the same review.
We have obtained preliminary information on operator available torque for the ten additional valves and our conclusions are based on that information.
The present valve population is
- 42.
Based on current information eight of the MOVs can have their operation delayed and be removed from the population, twenty six can be rerated, six would require motor replacement, and two would require operator replacement.
Two of the MOVs, which are included for motor replacement, and the two, which are listed for operator replacement, are related to the Boron Injection Tank (BIT).
Since we plan to remove the BIT and replace these valves during the second or third refueling after September 1, 1982, we will not modify or replace these operators.
Attached is our updated plan to resolve this item.
8401270233 840120
- PDR ADOCK 05000280 p
PDR 1/ tJ" I
e e
VIRGINIA ELECTRIC AND POWER Co:!d:PANY TO Based on progress to date, we anticipate that the rerating or replacement of the thirty MOVs which remain can be completed prior to the end of the second refueling after September 1, 1982.
We will inform you of any changes which affect our ability to meet this schedule.
cc:
Mr. R. C. Young, Director NRC Office of Inspection and Enforcement Division of Reactor Operations Inspections Washington, D.C.
20555 Mr. J.P. O'Reilly Regional Administrator - Region II Ml~~
W. L. Stewart~
SURRY POWER STATION UNIT 1 AND 2 MOV RERATE AND REPLACEMENT PRELIMINARY PLAN e
- 1.
Verify which valves must operate on an SI or CLS. (completed)
- 2.
Verify required torques to operate valves based on calculations for all except butterfly and wafer valves. (completed)
- 3.
Provide comparisons of required torques for butterfly and wafer valves.
(Verified - Completed)
- 4.
Limitorque has previously provided information on the torque capabilities of the motor operators and will be requested to determine if a torque switch replacement or reset, a motor replacement, or a motor and operator replacement is required.
We presently anticipate that this will be completed in March, 1984.
- 5.
Design Change Packages (DCP) will then be developed to make these modifications.
We anticipate that the DCP 82-35 for Unit 1 and DCP 82-36 for Unit 2 will be available in July, 1984.
- 6.
Implementation will occur as feasible in the next refueling and intervening maintenance outages.
STATUS OF VEPCO MOV ANALYSIS SURRY POWER STATION UNIT NOS. 1 AND 2
- 1.
Total number of MOVs on original list
- 2.
Number of MOVs which are not required to operate on SI or CLS
- 3.
Number of MOVs which are required to operate on SI or CLS which were not included on original list
- 4.
Number of MOVs which are required to operate
- 5.
Number of valves which may be delayed and removed from the population
- 6.
Number of valves remaining in population
- 7.
Number of MOVs in #6 which can be rerated (May require torque switch limiter plate replacement or reset)
- 8.
Number of MOVs in #6 which can be rerated with motor replacement
- 9.
Number of MOVs in #6 which require replacement or modification of the motor operators 84 52 10 42
- l Four of these valves are attached to BIT lines and may not be rerated if the BIT is removed prior to 3rd refuel after 9-1-82.
- 2 Two of these valves are attached to BIT lines and will not have their motors replaced if the BIT is removed prior to 3rd refuel after 9-1-82.
- 3 These valves are attached to BIT lines and will not have their operators replaced if the BIT is removed prior to 3rd refuel after 9-1-82.
- 4 Based on a preliminary review.
We will do a complete review prior to installing a delay or will replace the operator by the end of the third refueling after 9-1-82.