ML17340A850
| ML17340A850 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 03/02/1981 |
| From: | Michelson C NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD) |
| To: | Rehm T NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| Shared Package | |
| ML17340A851 | List: |
| References | |
| NUDOCS 8103190133 | |
| Download: ML17340A850 (4) | |
Text
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AEOD RF AEOD SF CHichelson, AEOD CHeltemes, AEOD
- SSands, ABOD FROM:
NEh/ORANDUN FOR:
Thomas A. Rehm, A sistant for Operations to the Executive Director for Operations Carlyle Nchel son, Director Office for Analysis and Evaluation of Operational Data j~ ~%/(g
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SUBJECT:
ENGINEERING EVALUATION OF FEEDllATER TRANSIENT AND BREAK AT TURKEY POINT UNIT 3
References:
(1) Letter, William J. Dircks, Executive Director for Operations, Nuclear Regulatory Commission to The Honorable Dante B. Fascell, United States House of Representatives, dated January 29, 1981.
(2) Letter, Honorable Dante B. Fascell,
)<ember of Congress, House of Representatives, to Hr. Carlton C. Kammerer, Director Office of Congressional Affairs, NRC, dated December 5, 1980.
(3) Letter, Warren Hoskins, President Conchshell Alliance to Congressman Dante B. Fascell, dated December 2, 1980.
Pursuant to your request, AEOD has reviewed the NRC response (Reference
- 1) to Congressman Fascell's letter of December 5,
1980 (Reference 2).
The enclosure to Congressman Fascell's letter contained a letter from /fr. Warren Hoskins (Reference
- 3) concerning the series of events that occurred at Turkey Point Nuclear Power Station, Unit 3, on November 19, 1980.
It is our belief -that the issues presented and the information enclosed was responsive to t1r. Hoskin's concerns.
Although the IE evaluation did not address the specific failures leading to the sequence of events, AEOD concurs in general with the NRC letter.
Based on our review of the letters, AEOD conducted an engineering evaluation to determine the causes for the reactor trips and the break of an alternate feedwater pipe from Fossil Unit $o. 2.
Our brief evaluation has concluded that the multiple failures of the Copes-Vulcan feedwater valves lead to the feedwater flow instabilities and subsequent reactor trips.
The feedwater instabilities induced severe vibration in the secondary cooling system which apparently sheared the two-inch ancillary feedwater pipe.
Enclosed is a
description and sequence of occurrences at Turkey Point 3 and our evaluation of the event.
Original Signed by Car1yle Micbelsoa Carlyle tlichel son, Director Office for Analysis and Evaluation of Operational Data OfFICE) 5URNAME)
DATEP AEOD
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