ML19345F632
| ML19345F632 | |
| Person / Time | |
|---|---|
| Site: | Beaver Valley |
| Issue date: | 02/12/1981 |
| From: | Burski R DUQUESNE LIGHT CO. |
| To: | Chaney D Office of Nuclear Reactor Regulation |
| References | |
| BVPS-LC:RFB:2, IEB-80-06, IEB-80-6, TAC-42722, NUDOCS 8102180695 | |
| Download: ML19345F632 (2) | |
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Artseggi Pa-152'9 DUQUESNE LIGHT COMPAh"f Beaver Valley Power Station Post Office Box 4 Shippingport, PA 15077 February 12, 1981 BVFS/LCi?JB:2 Memorandum of Telephone Conversation Information on IE Bulletin 80-06 Response Mr. Dennis Chaney, Licensing Project Manager United States Fuclear Regulatory Commission Office of Nuclear Reactor Regulation Division of Licensing Washington, DC 20555
Dear Mr. Chaney:
This memorandum confirms items discussed during a telephone conference on February 10, 1981 between you and Phil Bender, Messrs. Don Lautenbach and Doug Hacket of EG and C, and myself regarding additional information in IE Bulletin 80-06.
1)
There were two different seal-An circuit modifications made on equipment at Beaver Valley. The air ejector vent and supplementary bypass and exhaust damper circuitry were modified by wiring a pair of contacts of f the auxiliary relay in series with the control switch.
This allows the auxiliary relay to remain energized even when the initiating signal is removed. The circuit is deenergized only by operator action at the control switch.
The charging pump cubicle exhaust dampers and safeguards pit isolation dampers circuitry were modified by replacing the maintain switch with a spring return to center switch. The center position contacts are not wired. With this type of control circuitry, removing the initiating signal has no effect on dampers. Operator action is g O g required to reposition the dampers. These modifications were D
installed during the recently completed outage and tested 3
successfully in early October.
10 8102180G M
,. _. w.
Beaver Valley Power Station, Unit No. 1 IE Bulletin 80-06 Response Page 2 l
2)
The accumulator discharge valves are motor operated valves.
The bypass referenced in the response is electrical in that there is no seal-in circuit to have the valves stay open on an S.I. Signal. To defeat this feature, a lock out jack similar to a test plug is installed in the control circuitry.
The plug is located on the vertical board in the control room.
In.9ccordance with the technical specifications, the discharge valves are required to be open and remain open above 1000 PSIG.
This is accomplished by opening the valve and removing the lock out plug. This allows for control board indication but defeats any open or close signals the valves may receive, either manual or automatic.
The plug is reinstalled when it is necessary to apply control power to the valves.
1 3)
Procedures require resetting the feedwater bypass valve controllers to the closed or "0" open position. The indicators read 0-100% full open.
The valves would return to their pre-feedwater isolatic trip position if not reset to "0" open.
To reiterate, the main feed pumps trip and downstream valves isolate automatically on feedwater isolation, so failure to adhere to this procedural step prior to resetting the feed-water isolation signal would have no adverse consequences.
Very truly yours,.
R. F. Burski i
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