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:	Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC)
References
AO-74-43, NUDOCS 8401270037
Download: ML20086K349 (2)

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$l PHILADELPHIA ELECTRIC COMPANY S

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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:

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Reference:

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

+1 Report No.:

50-277-74-43 5

Report Date:

October 13,.1974 I[

Occurrence Date: October 3,.1974 4.'

Facility:

Peach Pottom Atomic Power StatioT

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

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.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.

i October 13, 1974 O

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j Description of Occurrence:

i 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.

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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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t Analysis'of Occurrence:

- 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.

pm Failure Data:

i

^Two occurrences of this type have been previously reported 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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oney As,'t Gen'l

'perintendent Generation Division

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Mr, _ J.

P. O'Reilly Director _ Region 1 United States ' Atomic Energy Commission 631 Park Avenue King of Prussia, PA 19406 I

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