ML20211N976
| ML20211N976 | |
| Person / Time | |
|---|---|
| Site: | Indian Point  |
| Issue date: | 12/05/1986 |
| From: | Selman M CONSOLIDATED EDISON CO. OF NEW YORK, INC. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| IEB-86-003, IEB-86-3, NUDOCS 8612180359 | |
| Download: ML20211N976 (2) | |
Text
Murrey Selmen Vee Presdent Consolidated Edison Company of New York, Inc.
Indian Point State Droadway & Bleakley Avenue Buchanan, NY 10511 Telephone (914) 737 8116 December 5, 1986 Re:
Indian Point Unit No. 2 Docket No. 50-247 Dr. Thomas Murley Regional Administrator - Region I U.S. Nuclear Regulatory Commission 631 Park Avenuo King of Prussia, PA 19406
SUBJECT:
I-E Compliance Bulletin No. 86-03:
Potential Failure of Multiple ECCS Pumps Due To Single Failure.
Dear Dr. Murley:
The subject Bulletin was issued to advise Licensees of the potential for a single failure in mininum flow recirculation lines in ECCS systems which could, under certain circumstances, defeat ECCS pumps.
The failures cited in the bulletin pertain only to air operated valves.
In response to the Bulletin, Consolidated Edison evaluated the design of the safety Injection subsystem, the Residual lleat Removal Subsystems and the Containment Sump Recirculation Subsysten.
These three subsystens comprise in aggregate the ECCS system, which ernploy pumps.
All pumps within these systems do employ miniflow recirculation lines for pump protection. However, none presently incorporate air operators.
In the Safety Injection Subsystem, the valves af fected are 842 and 843, located in series in the miniflow line. These valves are normally open and are equipped with motor operators with their control power locked open via interlock switchcar if either valve closes an alarn annunciates.
Power in de-energized to prevent spurious valvo closure. The design of the Residual lleat Removal subsystem is similar to that of the Safety Injection Subsystem.
There are two motor operated valves, 1870 and 743, which are normally in the open position, with their control power locked open via the breakers in the motor control conter.
In the Recirculation Sump Subsystem, the miniflow line discharges back into the Recirculation Sump.
There are two valves, 1817A and 1817B, for each of the two pumps, which are manually operated and are in the open position during all phases of operation.
Tj ll 0612100359 061205 PDR ADOCK 05000247 O
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We, therefore, concluded that the pumps within the Indian Point Unit 2 ECCS system are not susceptible to a single failure whereby the pumps would operate continuously under shutoff head conditions.
This response is being provided pursuant to Section 182 of the Atomic Energy Act as amended.
Should you or your staff have any additional questions, please contact us.
Very truly yours, 18.190.11.25.2 g
cc Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555 Subscribed and Swor gto before me this /d "
day of December 1986
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