ML20086K349

AO 74-43:on 741003,setpoint of Condenser Low Vacuum Scram Pressure Switch Found Outside Limits Allowed by Tech Specs. Caused by Setpoint drift.Out-of-tolerance Pressure Switch Recalibr

ML20086K349
Person / Time
Site:	Peach Bottom
Issue date:	10/13/1974
From:	Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	Giambusso A US ATOMIC ENERGY COMMISSION (AEC)
References
AO-74-43, NUDOCS 8401270037
Download: ML20086K349 (2)

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PHILADELPHIA ELECTRIC COMPANY l

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121si 8414ooo October 13, 1974

' 8 Mr. A. Giambusso

- Deputy Director of Reactor Porjects United States Atomic Energy Commission ,

Directorate of Licensing Washington, D.C. 20545 g

Subject:

Abnormal Occurrence The.follywing occurrence was reported to Mr. Walt Baunack, 7 A.E.C. Region.1 Regulatory Operations Office on October 4, 1974. L Written notification was made to Mr. James P. O'Reilly, Region 1 Regulatory Operations Office on October 4, 1974. In accordance with Section 6.7.2.A of the Technical Specification, Appendix A'of DTR-44 for - Unit 2 Peach Bot tom Atomic Power Station, the following report is being submitted to the Directorate of Licensing as an Abnormal l > Occurrence: , ;w

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Reference:

License. Number'DPR-44, Amendment Number 1 g'F Technical, Specification Reference Table 3.1.1

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Report No.: 50-277-74-43

. Report Date: October 13,.1974

• I[ Occurrence Date: October 3,.1974 4 .' Facility: Peach Pottom Atomic Power StatioT

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m( R.D. 1, Delta, Pennsylvania .1731]4

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l 3 Identification _of Occurrence: o l.4 Setpoint of condenser low vacuum scram pressure switch found

[/g to,.be outside the limits allowed by the Technical Specifications.

a Conditions Prior to Occurrence:

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The reactor was operating at 86% power.

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'Mr. A. Giambusso. Page 2 ~]

October 13, 1974 i O O .

t Description of Occurrence: .

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During a routine instrument surveillance test, the setpoint i of the condenser low vacuum scram switch, PS-2-5-llA, was found to  !.

' be outside the limit of greater than or equal to 23 in. IIg. The' device t performed satisfactorily. l

. l' Designation of Apparent Cause of Occurrence: ,

This occurrence is due to setpo' int drift of the pressure [

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-switch.

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Analysis'of Occurrence: t

- The contacts of this device are arranged in a one-out-of-two' t twice trip logic. The setpoint of.this device, not the trip function, ,

was unsatisfactory. All other devices monitoring the parameters of ,

condenser vacuum were immediately tested and found to be operational  !

and correctly calibrated. Because of the above reasons this occurrence has minimal safety implications. j Corrective' Action:

Li The out-of-tolerance' pressure switch was immediately re-calibrated to within the allowable limits of the technical specifications.

The other three devices monitoring the same variable were tested .

.and found to be satisfactory in both function ano setpoint.

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• Failure Data: *

^Two occurrences of this type have been previously reported i as AO-50-277-74-1 and AO-50-277-74-19. After the latter, the device

.was r'eplaced in kind. A calibration shift was again reported in ,

AO-50-277-74-35. ,

- Very truly yours, <

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- As,'t Gen'l 'perintendent Generation Division P. O'Reilly

-cc: Mr, _ J.

Director _ Region 1  ;

United States ' Atomic Energy Commission 631 Park Avenue ,

King of Prussia, PA 19406 .

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