ML20086D979
| ML20086D979 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 08/22/1973 |
| From: | George Thomas VERMONT YANKEE NUCLEAR POWER CORP. |
| To: | US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20086D983 | List: |
| References | |
| AO-73-24, VYV-2966, NUDOCS 8312050713 | |
| Download: ML20086D979 (2) | |
Text
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Ru rl.AND, Vidm ONT 03701 REPLY TO:
VYV-2966 P. o. a x is7 VERNON. VERMONT oS354 August 22, 1973 I\\EhM's Director Y+
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RdFERENCE: Operating License DPR-28
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1 o a Gentlemen:
As defined by Technical Specifications for the Vermont Yankee
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& normal Uccurrence as AU- /,5-24.
At approximately 1400 on August 16, 1973, an instrument technician, while investigating a reported opening of the Pressure Suppression Chamber-Reactor Building Vacuum Breakers, discovered that the instrument lines monitoring suppression chamber pressure were incorrectly tubed to the differential pressure sensors which activate breaker operation, thus causing actuation with positive suppression chamber pressure. This inoperability of the Pressure Suppression Chamber-Reactor Building Vacuum Breaker system exceeds the Limiting Conditions for Operations as defined by Section 3.7.A.3.a of Technical Specifications. The subject section requires that two of two vacuum breakers shall be operable at all times when primary containment integrity is required.
'lhe instrument line connections to DPIS 16-19-32A and B were immediately corrected and returned to service by 1430 on August 16, 1973.
All other differential pressure sensors asscciated with systems that could affect the safe operation of the plant were investigated in order to observe the pressure indication and evaluate its validity. The results of this investigation showed that all were de nstrating proper response for the parameter being monitored.
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August 22, 1973 Page 2 A review of the circunstances surrounding this incident indicated that the installation drawing appropriate to these sensors was in error.
The Plant Operations Review Con:mittee reviewed the incident and concluded that the corrective action taken was sufficient to prevent recurrence of a similar incident.
Very truly yours, VERMONT YANKEE NUCLEAR POWER CORPORATION k.t c
nero G.S. *fhomas Assistant Plant Superintendent WFC/kbd
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