ML20090D664
| ML20090D664 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 05/07/1975 |
| From: | Carroll J JERSEY CENTRAL POWER & LIGHT CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| AO-50-219-75-13, NUDOCS 8303020262 | |
| Download: ML20090D664 (4) | |
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To:
James P. O'iteilly Directort.tc of Regulatory Operations Regicn I 631 Park Avenue King of Prussia, Pennsylvania 19406 Fron:
Jersey Central Pcuer 6 1.ight Co:.'pany Oyster Creek Suclear Generating Statico Docket #50-219 Forked River, New Jersey Od731
Subject:
Abnornal Occurrence Report No. 50-219/7d[13 The'fo11cwir.g is a preliminary report being subrJ tte:!
in cocpliance with the Technical Specificctions paragraph 6.6.2.
s-Preliminary Approval:
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k A /u/M,.._-.!!sy 7. 1975
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[I. T. Carroll, Jr[
Date cc: Mr. A. Gic.chusso j
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-w www wem MM) e 8303020262 750507 PDR ADOCK 05000219
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S/7/75 Occurrence:
5/7/75 e
itist Written Time of port Date:
5/7/75 Occurrence:
0130 OY511iR CREEK hm GENERATING STATION FORKED RIVER, NEW JERSEY 08731 Abnormal Occurrence Report No. 50-219/75/13 l
ENTIFICATICN Violation of the Technical Specifications, paragraph 2.3.S, OCCURRENCE:
which requires that isolation condenser system initiation occur with a time delay of 415 seconds after a specified high reactor pressure is reached.
This event is considered to be An abnormal occurrence as defined in the Technical Specifications, paragraphs 1.15A and D.
se 4DITIONS PRIOR Steady State Power Routine Shutdown Operation OCCURRENCE:
Hot Standby Cold Shutdown Load Changes During X Refueling Shutdown
.Routino Power Operation Routino Startup Other (Specify) g Op.rctic.
The reactor code switch was in the PERIEL position and reactor coolant tenperature was less than 217'F.
ICRit' TION OF On Wednesday, May 7,1975 at approximately 0130, while per-
'URRENCE:
forming a reutine surveillance test on the four (4) reactor high pressure isolation ' condenser initiation sensors (RE-15A, B, C, and D) and the associated time delay relays (6K9,10,11, and 12), it was discovered that time delay relay 6t11 failed b
to de-energize within 15 seconds after the associated pressure sensor (RE-ISC) was tripped. (RE-15C was maintained in a tripped condition for three (3) minutes and 6K11 failed to de-energize.) Time delay relay 6K11 was subsequently replaced.
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Abnormal Occurrence u
Report No. 50-219/75/13 Page 2 1he replacessent relay was tested and found to de-energize nine (9) seconds after PI-ISC was tripped.
APPARENT CAUSE Design Procedure OF OCCURENCE:
Manufacture Unusual Service Condition Installation /
Inc. Environmental Construction Co:sponent Failure Operator Other (Specify)
The cause of this event is currently under investigation.
ANAI.YSIS OF Four pressure switches are provided in the rer.ctor protection OCCURREh*CE:
system (RPS) to initiate the isolation condenser systen when there is a persistent IS second condition with reactor pressu at or above 1060 psig, hro of these pressure switches with associated tine delay relays.6K9 and 6K11 arc in one RPS 8 ited
(.:.annel, ui
- t!.c cthcr tus pic;;u:0 switch:: rith c::::
g tir.a dolay relays 6K10 and 6K12 crc in the other PM channel.
High pressure signals from two pressure switches, one in cacR RPS channel, are required to initiato the isolation condenscr system (coincidence of two RPS channels each of which is trip by one of two pressure sensors). Similarly, tice delay relsy 6K9,10,11, and 12 are also' de-energized by reactor low-low water level sensors. RE 02A, B, C, and D.
The failure of tinc delay relay 6K11 vould not have provented isolction condenseg system initiation had.either a reactor high pressure conditica at or above 1060 psig exispd for 15 secends or a tractor Iow-low water level condition existed for IS seconds.
Consequently, this event is considered to have no safety significance other than the loss of redundancy in one RPS channel.
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Abnormal Occurrence I"8' 3 Report No. 50-219/75/13 CORRECTIVE ACTION:
Tim delay relay 6K11 was replaced and the replacement relay was subsequently tested with satisfactory results.
Pertinent manufacturer data are lis't
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FAILURE DATA:
Manufacturer:
Agastat Model:
7022 PDT Range:
5 to 50 seconds Serial Number:
1712237
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A Date:
5 7 Prepared by:
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