05000193/LER-1978-004-03, /03L-0 on 780109:main Steam Line Low Pressure Switches Found to Actuate at Approx 35 Psig Below Tech Spec Requirements.Caused by Limited Setpoint Drift.Existing Surveillance Program Considered Adequate
| ML19269D538 | |
| Person / Time | |
|---|---|
| Site: | Rhode Island Atomic Energy Commission |
| Issue date: | 02/16/1978 |
| From: | Mathis C BOSTON EDISON CO. |
| To: | NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| Shared Package | |
| ML19269D536 | List: |
| References | |
| LER-78-004-03L, LER-78-4-3L, NUDOCS 7906040217 | |
| Download: ML19269D538 (1) | |
| Event date: | |
|---|---|
| Report date: | |
| 1931978004R03 - NRC Website | |
text
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I 30 A,c&D were found to actuate at approxiEtely 35 psig below the requirements of i
fBT 1 1 ITTTll Table 3.2. A of the Technical Spuifications. These instruments initiate a contain-l isolation signal to the Main Steam isolation valves if the Reactor Mode Switch l [TTT1 I ment lo ls ] l 1s in the RUN position. These instruments were immediately recalibrated and l
lol7]l satisfactorily tested.
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o l This occurrence was caused by limited setpoint drift.
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NAYE OF PREPARER