ML20086K600

Telecopy AO 74-51:on 741113,setpoint Shift Found on ECCS High Drywell Pressure Initiation Switch PS-2-10-101A. Caused by Setpoint Shift.Switch Checked.No Specific Cause Identified.Setpoint Checked,Swiitch Reset & Returned to Svc

ML20086K600
Person / Time
Site:	Peach Bottom
Issue date:	11/14/1974
From:	Ullrich W PECO ENERGY CO., (FORMERLY PHILADELPHIA ELECTRIC
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086K598	List: ML20086K594 ML20086K600
References
AO-74-51, NUDOCS 8401270344
Download: ML20086K600 (1)

Text

T C 't **

.:.: x = n r ~;.; -

i. ; *.~, .L a..,

~.u: . 7 * -'% -. y:=~,

~

- -~ ---~----~~:;.--

. u,I.o,. r p. . -

. . . - .---.;--- n. , ; , . s , s.,  : s. , -

g t,,y G au, fJ. h K t ch htt ou 2,t oxic Power Stat - y'[o Delta, 1ennt.Ivania 17314

!!ovenber 14, 1974 Mr. Jnaca P. O'Reilly, Director United Stat u Atomic Energy Co.::21ooton Directorate 01 Rey,ulatory Operationa 631 l' ark Avenue King of Pruccia, Pennnylvania 19405

Dear !!r. O'Reilly:

Subj ent: Anortn1 Occurrence 24_-J!our Untification Confir:In;; U. T. U11 rich's phone convernation with Mr. l' alt T,aunack, A.F.C. Penen 1 Regulatory Operations Office on Uuvecher 14, 1974.

Refcrenec: License Nucher DPR-44, Ancudacnt Nu,ber 1 Technical Specification Tcble 3.2.A Ecport No.: 50-277-74-51 Report Date: No- nbcr 14, 1974 Occurrenca Date: How uber 13, 1974 Tacility: Peach 14tto a Ate 2ic Pcuer Statien R.D.1, . nelta, Pcnnuylvania 17314 4

Identification of Occurrence:

Setpaint r.hif t on ECCS Hi Dryall Preuuure initiation critch PS-2-10-101A.

Conditionu Prior to Occurrence:

i Unit 2 at 90: pouer.

Dencrip:lon of Occurrence:

Daring routine inr,trum at r,urveillance testint;, thic cuitch van found to trf p at 2.18 poig. The Technical Specifiention li it io leco than or equal to 2 ps!r,.

Deuff. nation of Apparent Cauce of Occurrenec:

Sctroint shift, t ripped repeatedly near the an found cetpoint.

&calysia of Occurrutec:

Since the netpoint chif t van only niic,ht on;l thin r.uitch operates in a one-out-of-two twice logic, the safety icplicationa of this occurrence are eini a1.

Corrective Action:

The switch uan checked to deternine the cauce of the setroint chif t. Sa specific cauce was identified. The cultch van recet to a value within the Tech.11 cal Spec 111 cation linitn, i:etpoint checked ur,ing the nppropriate curveillance t er>t ,

and returned to service.

Tailure Data:

I;a previous iciluren of thin type for thin type and range of cuitch.

Very trulv yourr., e401270344 741123 PDR ADOCK 05000277

/,/C <'c'P..,-(

S PDR U. T. Ullrich, Surarintendent Peach letto:: Ato :ic Power Station