ML20076J567
| ML20076J567 | |
| Person / Time | |
|---|---|
| Site: | Calvert Cliffs  |
| Issue date: | 09/01/1983 |
| From: | Russell L BALTIMORE GAS & ELECTRIC CO. |
| To: | Murley T NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| RO-83-42, NUDOCS 8309070242 | |
| Download: ML20076J567 (1) | |
Text
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DE3IONATED ORIGINAL' DA LTIMORE C AO A N mFr..s. cou,pa,.a$.
g _. o uv p.o.somsavs WaLTIMORE. MARYLAND 2 3203 MUCLaat Pewse DhWTasENT Cat.vtar coeres wucor.An powan phasev Lutet, ananggaese aesst September 1. 1983 Dr. Thomas E. Marley Regional ad=4=tatrator U. S. Woclear Re8mlatory Commission Region 1 631 Park Avenue King of Prusasm, PA 19406
SUBJECT:
LER 83-42 (U-2)
Dear Dr. Murley:
This letter is to confirm our verbal notification of your Me, David Trimble that 22 Feedwater Regulating Valve would not decrease feedwater flow to 5%
within 20 seconds as required by T.S. 3.3.2.1.
This report is submitted per T.5. 6.9.1.8.
The event and causa dancription are as follows.
Investigation of Post Trip data following a reactor trip of 5-9-83 rev.usted a rapid filling of 22 Steams Generator. This initially wee attributed to a
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spurious initiation of Auniliary Feed Water concorrent with the trip.
A review of Foot Trip data on a subsequent trip ea 8-22-43 again indicated a rapid filling of 22 Steam Generator. Troubleshooting of 22 Feedwater Reg-ulating Valve revealed it was stroking too slowly. The valve was exercised and its stroke time decreased to within specification prior to restart of the unit.
On 8-31-83 the General Supervisor. Operations determined that the two inst = aces of rapid f111*== of 22 Steast Generator resulted from the failure of feed flow to be reduced to 5% within 20 seconde as required by T.S. 3.3.2.1.
Further investigation following a reactor trip on 8-31-83 revealed that 22 Feedwater Regulating Bypass Valve was opening to allow greater than $1 foodwater flow following reactor trip. The valve was adjusted prior to restart of the unit.
A more complete description as to the cause of this event,and corrective action tak== to prevent recurrence wil1~be contained in the follo m report.
Very truly yours.
L. B. Russell Plant Superint==d==t cc:
J. A. Tiernan R. M. Douglass Director Office of Management R. E. Architzel Information & Program Control L. B. Russell M. A. Junge J. M. Moreira
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8309070242 830901 PDR ADOCK 05000 s
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