ML19308D319
| ML19308D319 | |
| Person / Time | |
|---|---|
| Site: | Crystal River  |
| Issue date: | 03/15/1977 |
| From: | Stewart W FLORIDA POWER CORP. |
| To: | |
| Shared Package | |
| ML19308D316 | List: |
| References | |
| NUDOCS 8002270762 | |
| Download: ML19308D319 (2) | |
Text
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OOCxET NUMUER EVENT OATE REPORT DATE ECON 41 - I -J LL_J LLJ 1015101-101310 l2 l 10I,10 la 17 l7 1 1013111s1717 i 7 8 57 50 59 GO 61 68 69 74 75 00 EVENT DESCalPTION
$l Miile operatinn at 40 eercent power. steadv state. Main Steam Relief Valve MSV-35 l
7 89 UO E l opened at 985 osic. This is below Technical Snecification value of 1090 esic.
Thero l
7 89 00 hl were redundant systems operable and available. A sicillar occurrence of this type l
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occurred on 25 February lo77.
As soon as cl ane enndf rions ne mi-end. Php 14ft spe-l
/U9 80 oin I point of 1050 psig was re-established.
(77-22) l 7 89 pnug 60 svertu CAust COuvumeNT couPONtNT CODE COCE COMPONENT CODE SUPREA MANUFAC1URER VOLATON O
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5.
hl MSV-35 Relief Valve lif ted 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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_ _ _l u9 UU 8Q02 270 M2 MOITIONAL FACTOn3 See the attached Supplementary Information.
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Supplementary Information 1.
Report No:
50-302/77-22 2.
Facility:
Crystal RLver Unit 3 3.
Report Date:
8 March 1977 4.
Occurrence Date: 15 March 1977 5.
Identification of Occurrence:
Main Steam Relief Valve MSV-35 lifted at a pressure of 985 psig. The required setpoint is 1050 psig i 12.
6.
Conditions Prior to Occurrence:
On 8 March 1977, Crystal River Unit 3 was in Mode 1 condition at 40% power.
7.
Description of Occurrence:
5-During Mode 1, steady state, the Main Steam Relief Valve MSV-35 opened below the required setpoint. No other MSV's opened at this time. There was no safety significance as the overpower trip setpoint was set at 50%.
The balance of the MSV's were operable and redundancy was maintained.
When plant conditions permitted, the setpoint was checked and reset.
8.
Designation of Apparent Cause of Occurrence:
The cause of this occurrence was determined to be a normal setpoint drift.
9.
Analysis of Occurrence:
This was the second occurrence of this type of event, but the first involving MSV-35.
The setpoint was calibrated as soon as conditions permitted.
10.
Corrective Action:
Main Steam Relief Valve MSV-35 was calibrated to the correct lift setpoint j
of 1050 psig i 1%.
11.
Failure Data:
There has been one other occurrence of this event involving MSV-36 on 25 February 1977.
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