L-76-326, Response to Letter of 8/13/1976 to Evaluate Reactor Coolant System Design and Provide Certain Information Regarding Susceptibility to Overpressurization Events, FP&L Will Report the Results by 10/15/1976

Response to Letter of 8/13/1976 to Evaluate Reactor Coolant System Design and Provide Certain Information Regarding Susceptibility to Overpressurization Events, FP&L Will Report the Results by 10/15/1976

ML18127B157
Person / Time
Site:	Saint Lucie
Issue date:	09/03/1976
From:	Uhrig R E Florida Power & Light Co
To:	Ziemann D L Office of Nuclear Reactor Regulation
References
L-76-326
Download: ML18127B157 (5)

Text

U.S.NUCLL'AR REGULATORY

'ISSION NRC FoRM 195 g 7al r NRC DISTRIBUTION FoR PART 60 DOCI<ET MATERIAL DOCKET NUMOER'0-335 FILE NUMBERS RIb~f TO: Mr.Dennis L.Ziemann FROM: Florida Power&Light Company Miami, Florida Ifr.Robert E.Uhrig DATE OF DOCUI1ENT 9 3 76 DATE RECEIVED 10 22 76 ABETTER 0 ORIGINAL.@SCOP Y DESCRIPTION 0 NOTOR IZ E D JRCUNC LASS IF I E D PROP INPUT FORM ENCLOSURE NUMBER OF COPIFS RECEIVED One signed copy REACTOR VESSEL OVERPRESSURIZATION DISTRIBUTION PER G EECH 10-21-76 (2-P)Ltr.re our 8/13/76 ltr....furnishing requested information regarding Reactor Vesspl Overpressurization.

I ACKNOWLZDGED.

'iD050T REMPVE PLANT NAME: St.Lucie ijl SAFETY BiiANCH CHIEr.5 LIC~ASST: PROJECT MANAGER: Ziemann Silver Di s FOR ACTION/INFORMATION 10 22 76 RJL INTERNAL DISTRIBUTION NRC PDR.-GOSSICK&STAFF SHAO BUTLER ZECH LPDlh: F t.Pierce Fla NSIC.EXTERNAL DISTR IOUTION IBSEN~ONTROL NUMOER yu647 Nflc FORM IOII I2 76)

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P.O.BQX 6g~~g jc~gg V'Sc~tember 3, 197;L-76-326 Office of nuclear Reactor Regulation Attention:

Rr.Dennis L.Eiemann, Chief Operating Reactors Branch 02 Division of Operating Reactors U S.Nuclear Regulatory Comission Sashington, D.C.20555

Dear Hx.Ziemann=Re:

St.Lucie Unit 1 Docket No.50-335 Reactor Uessel Ove ressurization Your letter of August 13, 1976 requested that Florida Power a Light Company (PPL)evaluate the St.Lucie reactor coolant system design and provide certain information regarding the susceptibility to overpressurization events.You requested that we either provide the information within 60 days, or explain why we cannot taeet this schedule and provide a schedule that we will meet.Xn response to your request, FPL has joined a utility tas3c group which was formed to examine the complexity of overpressurization events for the purpose of developing a solution to the over-pressurization problem.The task group wilX.meet in the near future to evaluate ways to minimize the potential for reactor vessel overpressurization events.In addition, some revisions to the St.Xucie Unit 1 operating procedures have been made to reduce the probability of ovei-pressurization events.FPL will continue to examine the St.Lucie operating procedures and administrative control.s during the 60 day period referenced in your letter to evaluate possible additional procedural changes which could further reduce the possibility of reactor vessel overpressurization.

As an 9.nteri~measure plant operating personnel have been directe8 to exercise caution, especially during operation at reduced pressure and temperature, in controlling primary systen pressure.

Office of Nuclear Reactor Regulation Attention:

Ma.Dennis L-Ziemann, Chief Page Two Re vill report the results of task group meetings and FpL Procedure reviews by October l5, 1S76.Our recoumenQations and a schedule for providing the information you requested vi3.l be included in the report.Very truly yours, Robert: E.Uhrig Vice President ,RBU/NAS/cpc cc.Hr.Nolan C.Hose).ey Jack R.Hevman, Esquire V'I t Y'f TV TD ova-ua-boa.aaz thh Al~l