ML20090D765
| ML20090D765 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 03/27/1975 |
| From: | Ross D JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Anthony Giambusso Office of Nuclear Reactor Regulation |
| References | |
| AO-50-219-75-07, AO-50-219-75-7, NUDOCS 8303020343 | |
| Download: ML20090D765 (3) | |
Text
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( >>j-Jersey Central Power & Light Company
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w'y MADISON AVENUE AT PUNCH BOWL ROAD
- MORRISTOWN, N.J. 07960
- 201-539-6111 unmun er rus (e
Public Utilities Corporation General
,,,ra m March 27, 1975
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Mr. A. Giambusso
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United States Nuclear Regulatory Commission Ny;';.
Washington, D. C. 20545 N
Dear Mr. Giambusso:
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Subject:
Oyster Creek Station Docket No. 50-219 Abnormal Occurrenc,e, Report No. 50-219/75-7 The purpose of this letter is to forward to you the attached abnormal occurrence report in compliance with paragraph 6.6.2.a of the g
Technical Specifications.
Enclosed are forty copics of this submittal.
Very truly yours, GF^ kt(As
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jl Donald A. Ross, Manage'r-1 Generating Stati rns-Nuclear I
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Enclosures I
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Mr. J. P. O'Reilly, Director Office of Inspection and Enforcement, Region 1
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Y 3430 8303020343 750327 PDR ADOCK 05000219 3
PDR COPY SENT REGION
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O im f-Jersey Central Power & Light Company 'f' v
MADISON AVENUE AT PUNCH BOWL ROAD
- MORRISTOWN, N.J. 07960
- 201-519-6111
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f.Z., Pubhc Utdities Corporation senerai SVSTim OYSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER, NEW JERSEY 08731 Abnormal Occurrence Report No. 50-219/75-7 Report Date March 27, 1975 Occurrence Date March 19, 1975 Identification of Occurrence Failure of dehumidifying heater (EllC-1-5) in standby gas treatment system No. I to energize upon system initiation. This event is considered to be an abnormal occurrence as defined in the Technical Specifications, paragraph 1.15D.
Conditions Prior to Occurrence The plant was operating at steady-state power with major parameters as follows:
Power:
Thermal, 1848 MWt Electric, 649 MWe 6
Flow:
Recirculation, 58.3 x 10 lb/hr Feedwater, 6.88 x 106 lb/hr Stack Gas:
33,600 pei/sec Description of Occurrence At 1450 on March 19, 1975, while performing a test of the standby gas treatment systems (SGTS), it was observed that the dehumidifying heater EllC-1-5 in SGTS No. I failed to energize.
An investigation was initiated to determine the cause of the failure.
It should be noted that the SGTS No. 2 was observed to function satisfactorily at the time of this event.
Apparent Cause of Occurrence The cause of the failure was traced to a plugged orifice in the air supply to the controller. The controller functions to initiate three (3) dehumidifying heaters which together form heater EllC-1-5 in SGTS No. 1
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e" Abnormal Occurrence Report No. 50-219/75-7 Page 2 Analysis of Occurrence The dehumidifying heaters act in conjunction with the prefilter to reduce the relative humidity of the inlet air to the charcoal and HEPA filters to a maximum of 70*4.
This is required to achieve maximum absorption efficicacy of the charcoal bed for gaseous iodine and to prevent damage to the HEPA filters. Since the dehumidifying heaters failed to operate, it can be concluded that the absorption efficiency of the charcoal filters would have been reduced.
Corrective Action A new type of differential relay manufactured by Moore Products Company was installed in place of the original orifice after the Plant Operations Review Committee determined that it was less susceptible to pluggage. The system was then satisfactorily retested. The Plant Operations Review Committee also recommended that this type relay be installed in dehumidifying heater control system for SGTS No. 2.
The HEPA and charcoal filters are presently being tested in accordance with the Technical Specification Requirements prior to the
. refueling outage.
Failure Data Not applicable.
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