ML20090D837

Preliminary AO-50-219/74-61:on 741218,stack Gas Sample Line Flow Alarm Received Following Automatic Operation of Auto Transfer Switch IT-4.Caused by Opening of 230 Kv Circuit Breakers in & N7.Pump Restarted

ML20090D837
Person / Time
Site:	Oyster Creek
Issue date:	12/19/1974
From:	Carroll J, Edelhouser J JERSEY CENTRAL POWER & LIGHT CO.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-74-61, NUDOCS 8303030124
Download: ML20090D837 (4)

Text

m n s

j',~, ,,

/.h.

l .c-

q. c, 5

bl4 -

To: James P. O'Reilly ,.

Directorate of Regulatory Operations '-

Region I '

631 Park Avenue .-

King of Prussia, Pennsylvania 19406 From: Jersey Central Power 6 Light Company Oyster Creek Nuclear Generating Station Docket #50-219 Forked River, New Jersey 08731 Sohject: Abnormal Occurrence Report No. 50-219/74/61 The following is a preliminary report being submitted in compliance with the Technical Specifications, paragraph 6.6.2.

Preliminary Approval: -

b / r??// Mf 12/19/74

. hJ. T. Carroll, Jr. / Dato cc: Mr. A. Giambusso 8303030124 741219 13,07,7 PDR ADOCK 05000219 S pyg

f,' (7 Abnormal Occurrence u) (#i Report lio. 50-219/74/61 Page 2 locally by the operator at 2201. The total amount of time the stack gas sampic pump was out of service was approximately one minute.

APPARENT CAUSE Design _ Procedure OF OCCURRENCE: Manufacture '

Unusual Service Condition Installation / Inc. Environmental Constructica x Component Failure Operator The opening of 230 KV circuit breakers IN and N7, initiated by a fault on 230 KV transmission line N-1028, caused a comentary voltage disturbance on the plant electrical distribution system.

This disturbance reficcted on instrument panel No. 4 initiated the automatic transfer switch IT-4. The momentary loss of voltage to the stack gas sample pump caused the pump trip.

ANALYSIS OF A review of the stack gas radiation monitor recorder traces OCCURRENCE:

showed the levels of both monitor channels to be relatively constant (at 600 cps) with no spiking before and after the pump trip. In a further effort to determine if excessive stack releases might have occurred during the approximate period that the stack gas sample pump was not operating, recorder traces of radiation monitoring systems associated with two gaseous streams released through the stack was re-viewed. A review of the off gas radiation monitor recorder traces showed that the icycls of both monitor channels were relatively constant (at approximately 1.5 X 103 mr/hr) with no spiking fnr a period of approvinately 60 minutes prior to