ML20027A236
| ML20027A236 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 08/26/1977 |
| From: | Lingenfelter J, Vallade S TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML20027A235 | List: |
| References | |
| RO-NP-33-77-40, NUDOCS 7810310309 | |
| Download: ML20027A236 (2) | |
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lt' 2, 1977, an operator attempted to cycle Pressuri j tvtNf Of SCRiPisoN A
gi At 0945 hours0.0109 days <br />0.263 hours <br />0.00156 weeks <br />3.595725e-4 months <br /> on,ugust eu zer Sample Valve RC 240A, for the purpose of obtaining a water sample for l r
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Jacque Lingenfelter/ Susan Vallade
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e TOLEDO EDISON COMPANY DAVIS-BESSE UNIT ONE NUCLEAR POWER STATION SUPPLEMENTAL INFORMATION FOR LER *NP-33-77-40 DATE OF EVENT: August'2, 1977 FACILITY: Davis-Besse Unitz 1 Containment Isolation Valve RC 240A was inoperable.
IDENTIFICATION OF OCCURRE3CE:
The unit was in Mode 3, with Fower (MWT) = 0, Conditions Prior to Occurrence:
and Load (MWE) = 0.
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 Description of Occurrence:
to cycle Pressure Sample Valve RC 240A for the purpose of obtaining a water sample for the station Chemist.ry Laboratory, but it would not stroke. The valve was in-
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op'erable, placing the unit in Action Statement (b) of Technical Specification RC 240A was closed and power 3.6.3.1.
In compliance with this Action Statement, removed at 1245. hours on August 2, 1977.
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 The second isolation valve for that penetration, RC 240B, to repair the valve.
was then closed and its power removed until work on RC 240A was completed,also in compliance with Action Statement (b) of Technical Specification 3.6.3.1.
There was an adjustment problem with Designation of Apparent Cause'of Occurrence:
This caused a strain on the motor a spring hanger installed for thermal expansion.
operator which caused the torque switch of the valve operator te prevent operation.
There was no danger to the health and safety of the public
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Analysis of Occurrence:
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 or to station personnel.
Safety Features Actuation System would have been able to,close RC 240B and thus At 1245 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.737225e-4 months <br />, RC 240A was closed
. assure Containment integrity if it was needed.
and power removed for further assurance of Containment integrity.
The hanger was readjusted, valve stroked successfully, and Corrective Action:
RC 240A was returned to service on August 8, 1977, removing the unit from Action An investigation of the hanger
, Statement (b) of Technical Specification 3.6.3.1. design was made by th 1
Change Beatiest 77-338. It was determined that the only change necessary was re-adjustment of the spring hanger.
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s A different Containment Isolation Valve, CV 5074, was ino"perable Failure Data:
-on July 27,1977 (see Licensee Event Report NP-33-77-38) due to personnel error.
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