ML19095A499

Sutmit Licensee Event Report No. LER 78-018/03L-0 Re Two Main Steam Safety Valves Were Not within Plus or Minus 3% of Setpoint as Required

ML19095A499
Person / Time
Site:	Surry
Issue date:	08/04/1978
From:	Stallings C Virginia Electric & Power Co (VEPCO)
To:	O'Reilly J NRC Region 1
References
Serial No. 452 LER 1978-018-03L-0
Download: ML19095A499 (3)

Text

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~J]JII !During refueling startup, PT-13, test of Main Steam Safety Valve Set:pojnt indicated

'__*[QJI) two (2) valves were not within plus or minus (3%) three percent of the setpoint as 1

required by the periodic test. The corrective action taken was to reset the valves

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__ [Qlli !cation 3.6 and ASHE Code and is reportable per Technical Specification 6.6.2.b(2) .

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LTwo (2_) consolidated safety relief valves were found to be outside of the three (3%)

__* OJJ] JPercent as found tolerance in their pop point. The cause is attributable to normal

~-_]III] 1setpoint drift. The valves were adjusted and retested sat.::=i:;,s:;,f..:ca...:cc...:tc...:oc...:r:..;i:;.*=ly.;...=.._ _ _ _ _ _ _ _ __,

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e Station, Unit 1 050-281 Report No: 78-018/0lT-0(03L)-O Event Date: 07-05-78 Title of Report: MS Safety Valve Setpoint Drift

1. Description of Event:

I During refueling startup, Periodic Test 13, test of Main Steam Safety Valve setpoint indicated two (_2) valves were not within plus or minus three percent (+/- 3%) of the setpoint as required by the periodic test. Safety valve SV-MS-105B drifted in the conservative direction (4 .11~ below setpoint).

Safety valve SV-MS-101B drifted over its setpoint but remained within the setpoi.nt range of other safeties in the system. The event is considered contrary to Technical Specification 3.6 and ASHE Code and is reportable per rechniGal Specification 6.6.2.b.(2).

2. Probable Consequences and Status of Redundant Systems:

The operation of the Main Steam Safety valves is designed for full

• opening at the setpoint. The combined capacity of the safety valves ex-ceeds the total steam flow corresponding to maximum steady state power operation. Though two of the five safety valves were outside of the plus or minus three percent *(+/-3%) setpoint, at no time were any of the safety valves unable to perform their full intended function. The health and safety of the general public were not affected by this occurrence.

3. Cause:

Setpoint drift is anticipated thus necessitating verification each refueling. Though the safety valves deviated from their setpoints, they maintained the capacity for pressure protection and steam flow relief.

4. Immediated Corrective Action:

The safety valves that were out of specification were immediately reset to within plus or minus one percent (+/- 1%) of their setpoint and retested to confirm proper pop point.

5. Subsequent Corrective Action:

None was required since all valves were capable of being set to "name-plate" pressure.

6. Actions Taken to Prevent Recurrence:

None

7. Generic Implications:

None