ML19308A516

RO 77-26/1P:on 771114,quadrant Power Tilt Exceeded +2.66% W/Reactor at 15% Full Power During Power Escalation Following Reactor Trip.Within 4-h,quadrant Power Tilt Not Reduced

ML19308A516
Person / Time
Site:	Three Mile Island
Issue date:	11/15/1977
From:	Ohanlon J METROPOLITAN EDISON CO.
To:
References
NUDOCS 7910250761
Download: ML19308A516 (2)

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POST Of7?CE Box 450 M3 DOLE'OW N cENNS'et.V ANia t~c5-  ? E i. F wC N E U 7.044JC41

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Dtreetorate cf Regulatory Operations &c a r $cculatory Cor : la.51on 631 Park Avene

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Dcchet 50-289 Tubjcet: Repertable f;ccurrence Sc. 77-26/LP Deer Mr. Gricr: -

j f KunderThis telecrar. is to confirm the telecen betw en Mr. C.

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t-Nac) 4t 1140 hours0.0132 days <br />0.317 hours <br />0.00188 weeks <br />4.3377e-4 months <br /> on 15 Novernher 1977 A viclat wn of the Technical Specif1 =tten 3 . 5. 2. 4. et occurred in that the quadr 9.-- pn%cr tilt was in excess of '2.58 f er ; renter .

than 4 beurs anc th.= prut c-ion s rste: rcecter pcwcr/1:.calance "nvelupe trip setpcints aere net r"+.:e;d 2 tercent in power tot each i percen' talt within that .s mr =? pericd.

At 1713 hcurs en.14 Noterbar 1977, T:ed" ' l ower tilt execeded

• 2.66% w:th the reacto.r at 15*. full ower durinc OcNer escalation e following reactor trip frem ICCt Full power. With2n 4 hcurs the

! quadrant power tilt was not reduced below +2.6% and the protection I

system reacter pcVer/ imbalance c :talene tric setpoints had not been reduced 2 percent in power for eccP 1 pcr:ent tra t .

.i Reduction '[5 trip setpcints becen at 214.~ hrs a:-d was in pr : r%;

whan tilt Was returned to the 2.'5 cercent 11.:.Lt.

~;x.e'1! ate ccrrectite action we '  :? "c deter: 1. c the cause fer tne tilt t .- c.xarining incere ictuctor data r.d centrel red resttiens.

Pcwer 9 sed 19tlen wa3 .1.rlted tc thi fu'l pcWCr 3nc red indCX 11.it3 were reducad to cc:.cly with Technarsi 5pecification 3.5.2.4.d and 3.5.2.4.e rections 2 ;r.d 3. Cund wn' :- :we'r t il t w._ - back with 11.ntts at 2343 'Mur'; en 14 Neva m . ' >-

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Mr. Boyce H. Crier 15 November 19 7 A more detailed evaluatien and any long term corrective action aswhich to themay cause be of this incident.

necessary will be discussed in the follow-up repor*..

'Mry truly yours,

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I. P. O'Han!c/

Unit ! Superintender.t JFO/ job m

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