ML19308D322
| ML19308D322 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 03/14/1977 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML19308D321 | List: |
| References | |
| NUDOCS 8002270769 | |
| Download: ML19308D322 (2) | |
Text
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@l below Technical Specificati L.7.1.1 value of 1050 psig. There were redundant systems l 3
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@l operable and available. This was not a repetitive occurrence. As soon as plant con-l 7 89 60 El ditions eermitted. the valve was reen11brated to within 1 eercent of 1050 osin.
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@l MSV-36 Relief Valve lifted due to reasons that are unknown at this time as the balance l
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@l of the Relief Valves did not open.
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I Supplementary Information
- 1.. Report No:
50-302/77-21 l
2.
Facility:
Crystal River Unit #3 3.
Report Date:
14 March 1977 4.
Occurrence Date: 25 February 1977 l!
5.
Identification of occurrence:
i Main Steam Relief Valve MSV-36 lifted at a pressure of 990 psig. The required setpoint is 1050 peig i 1%.
6.
Conditions Prior to Occurrence:
On 25 February 1977, Crystal River Unit #3 experienced a Reactor trip, t
and the Unit was returning to Mode 4 (Hot Shutdown).
7.
Description of Occurrence:
While enteri:2g Mode 4, following a Reactor trip, the Main Steam Relief Valve MSV-36 opened below the required setpoint. No other Main Steam j
Relief Valves opened at this time. There was no safety significance, i
as the Reactor was in a tripped condition at the time of the occurrence..
I The balance of the MSV's were operable and redundancy was maintained.
When the steam pressure decreased to a point below the MSV setpoint, the setpoint was checked and reset.
8.
Designation of Apparent Cause of Occurrence:
The cause of this occurrence ras determined to be a normal setpoint drift.
9.
Analysis of Occurrence:
This was the first occurrence of this event involving a Main Steam Safety Valve. When plant conditions allowed, the valve was calibrated to the proper setpoint.
10.
Corrective Action:
Main Steam Ralief Valve MSV-36 was calibrated to the correct lift setpoint of 1050 psig i 1%.
I 11.
Failure Data:
No previous events of this type have occurred.
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