ML20084E038

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Preliminary AO 50-219/74-23:on 740315,high Flow Isolation Setpoint for Isolation Condenser Condensate Line Break Sensors Found to Actuate at Differential Pressures in Excess of Tech Specs.Caused by Sensor Drift
ML20084E038
Person / Time
Site: Oyster Creek
Issue date: 03/18/1974
From: Carroll J, Rone A
JERSEY CENTRAL POWER & LIGHT CO.
To: James O'Reilly
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AO-50-219-74-23, NUDOCS 8304130334
Download: ML20084E038 (4)
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To: James P. O'Reilly - t2, Jrwg p:dr Directorate of Regulatory Operations $Q1 /C Region I ' 

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631 Park Avenue q* \@ King of Prussia, Pennsylvania 19406 ., ,I ,p, From: Jersey Central Power 6 Light Company Oyster C,reck S'uclear Generating Station Docket #50-219 Forked River, how Jersey 08731 

                 .         Subject :          Abnormal Occurrence Report No. 50-219/74/ 23 The following is a preliminary report being submittcd                                ,
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in compliance with the Technical Specifications paragraph 6.6.2. Prelimina'ry Approval: l$,'. * ' *:*'s 

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tidM9JlnJW8ey.una Se or " Report Date: 3/13/74 Occitrrence S/15/74 Initial t.'ritt en Time of Report Date: 3/18/74 . Occurrence: 1852 OYSTER CREEK :.'JC'. EAR CE.*:ER\ TING STATION .. FORKED RIVER, SEh* JEl:SEY OS731 

     ,                                                                  Abnormal Occurrence Report No. 50-219/74/ 23 IDESTIFICATION                  Violation of the Technical Specifications, paragraph 3.1. A.3, OF OCCURRENCE:                   the high flow isolation setpoint for the Isolation Condenser condensate line break sensors were found to actuate at differ-ential pressures in excess of those as stated in Technical Specification tabic 3.1.1.!!.2 (<27 inches' AP H O)2 .

This event is ::ensidered to be an abnormal occurrence as de-fined in the Technical Specifications , paragraph 1.15A . CONDITIONS PRIOR TO OCCURP2NCE: X Steady Stato Power Routine Shutdown Hot Standby Operation . Cold Shutdown Load Changes During Refueling shutdown Routine Power Operation Routine Startup Other (Specify) Operation Power: Reactor,1902 bMt Elec., 661 b%e Flow: Recirc. ,15.3 x 10" gpm Feed., 7.10 x 106 lb/hr Reactor Pressure: 1020 psig Stack Gas: 40,600 pCi/sec 

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                                                                                                                                       *i .' .r;.m- + /$ . *~. i.:yf.h DESCRIPTION                     On Friday, March 15,1974, at 1852, while performing routine OF OCCURRENCE:

surveillance testing on the Isolation Condenser condensate high flow line break sensort, it was observed that two of the four sensors (located two each on the A and B Isolation Con-densers) actuated at setpoints above the Technical Specification , limit of 27 inches !! 20. The two sensors, IB11A2 and 1B11B2, f Y 

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        ' " Report No. 50-219/74/23                                                                               Page 2                    ,

were both found to actuate at 29 inches of H2O differential pressure. The complete condensate line break sensor surveil-lance results were as follows: Isolation Condenser A Trip Reset Sensor (inches 1120 ) (inches !!20) 

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IB11A1 26.5 23 IB11A2 29,.5 25 s Isolation Condenser B Trip Reset Sensor (inches 110) 2 (inches 1120) 1B11B1 27 25,5 IB11B2 29 26.5 The 1B11A2 and IB11B2 sensors were recalibrated and were surveilled to function in the proper manner. The surveillance retest results were as follows: Isolation Condenser A 

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1 Abnofmal Occurrence O ~ O' - ileport No. 50-219/74/23 -* Page 3 , i I . d APPARENT CAUSE Design Procedure OF OCCURRENCE: Manufacture Unusual Service Condition j Installation / .Inc. Environmental 4 Const ruction Component Failure ) Operator Other (Specify) 4 

                                                      'Ihe cause of the occurrence has been attributed to sensor j

i drift . ' l  : l . j ANALYSIS OF The safety significance of this event lies in the loss of i OCCURRENCE: L j system redundancy. Had' a condition occurred whereby the condensers would have been required to isolate, the redundant sensors, IB11A1 and IB11B1, would have performed the isolation function in the proper manner. CORRECTIVE Corrective action will be tahon, as appropriate, pending Plant ! ACTION: j Operations Review Co=.11ttee revicu of this ' occurrence. J FAILURE DATA: Type: Barton Differential Pressure Switch . Range: 0-60 inches H 0 Pressure Rating: 1500 psig Serial Nos. : 1D11A2 - 27S-965 e (i. . -t.. 

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Prepared by: / G /'.-1, ( Date: 3/18/74 i k i S l c- ----. _

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                .ersey Centra l Power & Lig1t Company , 9 D

MADISON AVENUE AT PUNCH BOVA. ROAD

  • MORRtSTOWN, N.J.07960
  • 201-539-6111 Niunim 09 TNG General ((' ] Public Utilities Corporation srsrs =

March 25, 1974 

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C Mr. A. Giambusso - MAR 281974 - ,1 Deputy Director for Reactor Projects 'u . .i. / Directorate of Licensing 

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United States Atomic Energy Commission U. .a , / l Washington, D. C. 20545 s g

Dear Mr. Giambusso:

Subject:

Oyster Creek Station Docket No. 50-219 Abnormal Occurrence Report No. 50-219/74/23 The purpose of this letter is to forward to yoa the attached Abnormal Occurrence Report in compliance with paragraph 6.6.2.a of the Technical Specifications. Enclosed are forty copies of this submittal. Very truly yours, j 's o Donald A. Ross Manager, Nuclear Generating Stations cs Enclosures l cc: Mr. J. P. O'Reilly, Director Directorate of Regulatory Operations, Region I ) j ( L? . i 

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  • OYSTER CREEK NUCLEAR GENERATING STATION

, FORKED RIVER, NEW JERSEY 08731

  • Abnormal Occurrence Report No. 50-219/74/23 Report Date March 25,1974 Occurrence Date March 15,1974 Identification of Occurrence Violation of the Technical Specifications, paragraph 3.1. A.3, the high ficw isolation set point for the isolation condenser condensate line break sensors were found to actuate at differential pressures in excess of those as stated in Technical Specification Tabic 3.1.1.H.2 (127 inches AP H2 0). This event is considered to be an abnormal occurrence as defined in the Technical Specifi-
;          cations, paragraph 1.15A.

Conditions Prior to Occurrence , The plant was operating at steady-state power. The major plant parameters at the time of the occurrence were as follows: Power: Reactor, 1902 MWt Electric, 661 MWe Flow: Recirculation, 15.3 x 10 4gpm Feedwater, 7.10 x 106 lb/hr Reactor Pressure: 1020 psig Stack Gas: 40,600 pCi/sec Description of Occurrence On Friday, March 15,1974, at 1852, while performing routine surveillance testing on the isolation condenser condensate high flow line break sensors, it was observed that two of the four sensors (located two each on the A and B isolation condensers) actuated at set points above the Technical Specification limit of 27 inches H20. The two sensors, IB11A2 and 1B11B2, were both found to actuate at 29 inches of H2O differential pressure. 'Ihe complete condensate line break sensor surveillance results were as follows: ( j/ p I J

Abnormal Occurrence No. 50-219/74/23 Page 2 

                                        . Isolation Condenser "A" Trip                   Reset Sensor                  (Inches H 2O)          (Inches 110)
                         ,                                                          2 IB11A1                      26.5                    23
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IB11A2 29.5 25 Isolation Condenser "B" Trip Reset Sensor (Inches H 2O) (Inches H 2O) IB11B1 2 25.5 IB11B2 29 26.5 he 1811A2 and IB11B2 sensors were recalibrated and were survellied to function in the proper manner. The surveillance retest results were as follows: Isolation Condenser "A" 1 Trip Reset Sensor (Inches H20) (Inches H 2O) IB11A2 27 23 Isolation Condenser "B" Trip Sensor . (Inches 110) 2 (Inches H 2O) IB1182 .26.5 24.5 Apparent Cause of Occurrence ne cause of the occurrence has been attributed to the lack of sensor repeatability. Analysis of Occurrence ne safety significance of this event lies in the inability of the redundant sensors to perform at the Technical Specification limit set point. Had a condition occurred whereby the condenser would have been required to isolate, the redundant sensors, IB11A1 and IB11B1, would have performed the isolation function in the proper manner.

~ O O Abnormal Occurrence No. 50-219/74/23 Page 3 Corrective Action , After an evaluation of the November 14, 1972 isolation condenser test data, it has been concluded that dianging the trip set point of the isolation condenser condensate high flow line break sensors from the Technical Specifi-cations limit of 27 inches of water to 24 inches of water and the trip set point of isolation condenser steam high flow line break sensors from 20 psig to 15 psig will not adversely affect the isointion function of these sensors under transient conditions.- The appropriate procedures are now being revised in preparation for implementing these set point changes. Actual implementation will take place by March 27, 1974. It is expected that these changes will help avoid creating abnormal occurrences as a result of the lack of sensor repeatability. Failure Data Type: Barton Differential Pressure Switch Range: 0-60 inches H 2O Pressure Rating: 1500 psig Serial Nos. : IB11A2 - 278-965 1811B2 - 278967 G 

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