ML20084H267
| ML20084H267 | |
| Person / Time | |
|---|---|
| Site: | Oyster Creek |
| Issue date: | 04/03/1970 |
| From: | Kelcec G JERSEY CENTRAL POWER & LIGHT CO. |
| To: | Morris P US ATOMIC ENERGY COMMISSION (AEC) |
| Shared Package | |
| ML20084H270 | List: |
| References | |
| 01128, 1128, NUDOCS 8305030017 | |
| Download: ML20084H267 (2) | |
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'V "Jer%ey Central Power & Light. Company j
New Jersey Power & Light Company 7
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M ADI5oN AVENUE AT PUNCH GOWL Ro AD e MoRRISToWN, NEW JERtcYa 539-6111 c
April 3, 1970
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.Dr. Peter A. Morris
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Dear Dr. Morris:
Re: Q/ ster Creek No.1 Docket No. 50-219 In accordunce with the reporting reouirements of the Jersey Central Pover b
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Light Company Provisional Operating Licence No. DPR-16, Section 3. c.1..,
the following abnormal occurrence disclosed a condition that prevented a nuclear system frer performing ene of its safety functions.
On ch 25, 1970 during the ccurse of performing a curveil3nnce test on the f
reactor n.q;4 pressure scram pressure switches, it van observed that the sensing
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line to the high pressure scrcm precoure switch had developed a leak at a.
" Swage-Lok" fitting, which caused a level indicator to fail-up scale. At this time, an attempt was made to tighten the fittJng and the 3eak increased, causing the excess flow check valve in the primary pressure sensin6 line to close.
Tne result was a zero pressure signal to the pressure sensors mounted on this rack.
(IIigh Pressure Scram, High pressure Isolation Condenser Actuation, Condenser Lov Vacuum Scram By-pass, Core Spray Valve permissive, Triple Lov Level Auto Lepressurination, Level Transmitter to Feedvater Control System, Reactor Pressure Indicator' Transmitter and Auto-Relief Valvo Pressure), At first investigation, it was noted that the Protective Instrumentation Liniting Conditions for Operation could not be mot, the system,re.stora vore notified to prepare for a plant shut-dovn and repairs to the tubin, fitting vere immediate3y started. ReFairs were completed prior to inid ating the shut-down.
(It was approximately 50 minutes from time of occurrence unLil system was again normal.)
-On March 25, 1970, AEC Compliance was notified of this incident and informed that notification was made upon the basis of the inabilitf to meet a Limiting Condition for Operation.
Upon review of thic incident by the Operations Supervisor and the P3nnt frating Review Ccanittee, it was detennined that the single _ failure of this O
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Dr. Peter A. Morric Page 2 April 3, 1970
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concing line prevented the operation of both Isolation Condancers upon receipt of a reacbor high precoure signal. Raargency Condenser icolation on pipe-brcak vas a bill operable ac vac Enercancy Ccndenser actuation by low-low level
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and mactual operation from the control roum.
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Ac a result of this dete mination, a stady i3 in progress to determine the viring nodificatj onc nacencay to estab?.iah the cbility of the lhercency Condencers to er.erate en a high precoure signal in the event of a loco of a s: ingle preacure censing line. Ilodificationc will be completed ac socn as the viring changen have been reviewed and accepted as the proper corrective action to be taken. In the mean T,i:te, all operating personnel ha.ve been made aware i
of the precent cituation and reminded that p3nnt emarconey procedures call for
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verification of automatic action and manual initiation of such action is t
required.
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r Very truly yours, 7.
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a, ip Geo$'rge KM cee Marnger of Generating Stations GC/;)c cc: Mr. Robert if. Kiriran, Director Division of Compliance, Region I United Statec I,tcmic Enercy Com incien 9'(O Broad Street lievark, IIew Jersey 07102 l
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