ML19319B761
| ML19319B761 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 08/26/1977 |
| From: | Lingenfelter J, Vallade S TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19319B654 | List: |
| References | |
| NUDOCS 8001270225 | |
| Download: ML19319B761 (2) | |
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- g gat 0945 hours0.0109 days <br />0.263 hours <br />0.00156 weeks <br />3.595725e-4 months <br /> on August 2, 1977, an operator attempted to cycle Pressuri g i ss ou g lzer Sample Valve RC 240A. for the purpose of obtaining a water sample for [
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Jacque Lingenfelter/ Susan Vallade (419J 259-5000, ht. 151 NAMt PHONE 27021 O 01
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i' TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION g,
SUPPLEMENTAL INFORMATION FOR LER NP-33-77-40 DATE OF EVENT: August 2, 1977 FACILITY: Davis-Besse Unit 1 IDEYrIFICATION OF OCCURRENCE: Containment Isolation Valve RC 240A was inoperable.
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Conditions Prior to Occurrence: The unit was in Mode 3, with Power (MRT) = 0, and Load (MWE) = 0.
Description of Occurrence: At 0945 hours0.0109 days <br />0.263 hours <br />0.00156 weeks <br />3.595725e-4 months <br /> on August 2, 1977, an operator attempted to cycle Pressure Sample Valve RC 240A for the purpose of obtaining a water sample for the station Chemistry Laboratory, but it would not stroke. The valve was in-operable, placing the unit in Action Statement (b) of Technical Specification 3.6.3.1.
In compliance with this Action Statement, RC 240A was closed and power
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removed at 1245 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.737225e-4 months <br /> on August 2, 1977.
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On August 6,1977 at 1018 hours0.0118 days <br />0.283 hours <br />0.00168 weeks <br />3.87349e-4 months <br />, RC 240A was opened to enable station personnel to repair the valve. The second isolation valve for that penetration, RC 240B, was then closed and its power removed until work on RC 240A was completed, also 3
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in compliance with Action Statement (b) of Technical Sp-acification 3.6.3.1.
Designation of Aoparent Cause of Occurrence: There was a design problem with a spring hanger installed for thermal expansion which caused the failure of the j
motor operator.
It was designed with the support on the motor rather than on the piping. This caused a strain on the motor operator which caused the torque switch of the valve operator to prevent operation.
Analysis of Occurrence: There was no danger to the health and safety of the public or to station personnel.
From 0945 hours0.0109 days <br />0.263 hours <br />0.00156 weeks <br />3.595725e-4 months <br /> to 1245 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.737225e-4 months <br /> on August 2, 1977, the Safety Features Actuation System would have been able to close RC 240B and thus assure Containment integrity if it was needed. At 1245 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.737225e-4 months <br />, RC 240A was closed and power removed for further assurance of Containment integrity.
r Corrective Action: The hanger was readjusted, valve otroked successfully, and RC 240A was returecd to service o-August 8, 1977, removing the unit from Action Stat ement (b) of Technical Specification 3.6.3.1.
To prevent recurrence, a i
change in the spring hanger is being investigated by the architect / engineer, Bechtel Power Cornoration.
Failure Data: A different Containment Isolation Valve. CV 5074, was inoperable on July 27, 1977 (NP-33-77-38) due to personnel error.
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