ML20086G938
| ML20086G938 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 04/25/1975 |
| From: | Cooney M PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC |
| To: | Anthony Giambusso US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| AO-75-22, NUDOCS 8401130011 | |
| Download: ML20086G938 (2) | |
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PHILADELPHIA ELECTRIC COMPANY i
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23O1 M ARKET STREET PHILADELPHIA. PA.19101
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(215 041-4000
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April 25,1975 x
Mr. A. Giambusso, Director
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Division of Reactor Licensing
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. Uni ted States Nuclear Regulatory Commission
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W'3 Wa shi ng ton, D.C.
20555
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Dear fir. Giambusso:
Subject:
Abnormal Occurrence
_ se The following occurrence was reported to Mr. Walt Baunack, '
Region 1, Of fice of Inspection and Enforcement, Uni ted States Nuc1 car Regulatory Commission on April 16, 1975. Wri tten noti fication was made to Mr. James P. O'Reilly, Office of Inspection and Enforcement, Region 1, United States Nuclear Regulatory Connission on April 16, 1975.
In accordance wi th Section 6.7.2.A of the Technical Speci fi cations, Appenciix A or urn-56 tor ' nit j reach 6ottom Atomic Power Station, the u
following report is being submitted to the Di rectorate of Reactor Licensing as an Abnormal Occurrence:
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Reference:
License Number DPR-56 Technical Speci fication Ref.crence: Table 3 2.B Report No.:
50-278-75-22 Report Date:
A.pril 25,1975 Occurrence Date: April 16, 1975 Facility:
Peach Dottom Atomic Power Station R.D. # 1, Del ta, Pennsylvania 17314 1
Identi fication of Occurrence:
Setpoint of Core Spray Sparger to Reactor Vessel differential pressure alarm swi tch dPIS-3-14-43B, 'outside of Technica1 ' Speci fication li mi ts.
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Conditions Prior to Occurrence:
Unit 3 at approximately 87% power.
Description of Occurrence:
During a routine instrument surveillance test, the setpoint of dPIS-3-14-43B was found to have shif ted outside the Technical Spec-ification limits of 5 t 1.5 psid. The swi tch was found to trip at 6.65.
psid.
8401130011 750425 PDR ADOCK 05000278 k7f}8 G
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O W-278-75-22 Mr. A. Giambusso April 25,1975 Page 2 Designation of Apparent Cause of Occu'rrence:
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Setpoint shi f t.
2 Analysis of Occurrence:
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,this Due to the slight magnitude of the setpoint deviation, occurrence has minimal safety implications.
Corrective Action:
I The switch was immediately recalibrated, setpoint checked in
- iccordance with the applicable surveillance test and returned to servi ce.
failure Data:
One previous, on similar switch on Unit 2, reported as' 50-277-74-38.
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Very truly yours, I
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4 l-M.
Cooney Asst. Gent. Superintendent i
Generation Division cc:
Mr. James P. O'Rei lly, Di rector Of fice of Inspection and Enforcement, Region l'
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United States Nuclear Regulatory Commis'sion 631 Park Avenue
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l King of Prussia, Pennsylvania 19406 '
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