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MADISON AVENUE AT PUNCH BOWL ROAD
- MORRISTOW'N, N. J. 07960
- 201539-6111 NamesR O! THE General P '.
Public Utilities Corporation ama t: 1et' '-
May 31, 1974 r.
i Mr. A. Giambusso Deputy Director for Reactor Projects Directorate of Licensing United States Atomic Energy Commission Washington, D. C. 20545
Dear Mr. Giambusso:
Subject:
Oyster Creek Station Docket No. 50-219 Abnormal Occurrence Report No. 50-219/74/33 The purpose of this letter is to forward to you the attached Abnormal Occurrence Report in compliance with paragraph 1.15B of the Technical Specifications.
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Enclosed are forty copies of this submittal.
Very +ruly yours, MA -
1 Donald A. Ross Manager, Nuclear Generating Stations es Enclosures cc:
Mr. J. P. O'Reilly, Director Directorate of Regulatory Operations, Region 1 9
. DEKOK95-258 PDR
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OYSTER CREEK NUCLEAR GENERATING STATION FORKED RIVER, NEW JERSEY 08731 Abnormal Occurrence Report No. 50-219/74/33 Report Date-May 31, 1974 Occurrence Date_
May 21, 1974 Identification of Occurrence Violation,of the Technical Specifications, paragraph 3.4.B.4, when it was 16M232A and observed that both auto-depressurization system initiation timers,This 16M232B, failed to complete their timing cycle in less than two minutes.
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event is considered to be an abnormal occurrence as defin Specifications, paragraph 1.15B, D, and G.
Conditions Prior to Occurrence _
The reactor mode switch was in the The plant was shut down for refueling." Refuel" position and the rea Description of Occurrence _
i tion While performing the annual automatic initiation test of the auto-depres d 16M232B, system, it was observed that both system initiation timers,16M232A an hich is completed their cycle in 169 seconds and 127 seconds, respectively, wTh greater than the maximum allowable of 120 seconds.
f the reactor the opening of the valves and the subsequent depressurization o low reactor vessel for a time period of 120 seconds after receiving coincident h
pressure water level, high drywell pressure, and core spray booster pump disc arge keylock reset signals. -The timers may be manually recycled by the operation of a i
initiation.
switch located on Panel IF/2F in the control room in i
completes its cycle.
Apparent Cause of Occurrence _-
d The cause of this occurrence is felt to be a lack of clarity in the proce urc l
d verify which ~ did not specifically instruct the operator to time the cyc e an this to be two niinutes or less.
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IAbnormal Occurrence No.E50-219/74/33 Page 2'
- Analysis of Occurrence'
'The auto-depressurization systemtis required:tofdepressurize the. reactor vessel
- toLless' than' 285 psig. in the. event of a'small. breakLdesign bases LOCA..In'this
' event,-it is, possible for the. reactor pressure to remain above the ' core spray -
. permissive level with a continued loss.of reactor coolant inventory until such time
.cs the' auto-depressuri'zation' system initiates.
System initiation would have been '
delayed by~approximately seven seconds had it been required to function as part cof the.ECCS, 9
Corrective Action l The; timers were reset and were observed to time out in two minutes or less:
16M232A - 117 seconds 16M232B -:120' seconds The; timers:h've been retested since they were reset and found to. repeat the times i
a as recorded above.
However, in order to insure operation wit.hin two minutes, the timers will be set at 105 seconds.
A study will'be made to determine the significance of the seven second delay for.
_ auto-depressurization. system initiation.
- The surveillance procedure will be revised to specifically instruct' the operator to. time the cycle and record'same.
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! Failure Data Type:
GE'CR120 KT Delay Unit Model:- 02241AA 6
Range:
0-5 minute adjustable Y
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