ML18127B104

Letter Pressure-Temperature Limits

ML18127B104
Person / Time
Site:	Saint Lucie
Issue date:	02/25/1977
From:	Robert E. Uhrig Florida Power & Light Co
To:	Ziemann D Office of Nuclear Reactor Regulation
References
L-77-60
Download: ML18127B104 (6)

Text

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0 U.S. NUCLEAR REGULATORY CO MISSION tcC DISTRIBUTION FoR PART 50 DOCKET MATERIAL DOCKET NUMBER 50-335 FILE NUMBER I.ETTE R ABORIGINAL ClcoP Y ONOTORIZED IRUNCLASSIFIE D TO: Mr, D. L. Ziemann PROP INPUT FORM FROM:FPL Miami, Fla.

33101 R E Uhrig DATE OF DOCUMENT 2-25-77 DATE RECEIVED 2-28-77 NUMBER OF COPIES RECEIVED 3 signed 37 CC DEscRIPTIoN Ltr furn info on pressure-temperatur limits for the X9a~Mz firstz 2 effective years of full power operation

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1P gure 3/4 4-23a entitled "Reacto Coolant System Pressure Temperature Limit-ations for up to 5 Years of Full Power Ope ation. ". ~ 1P (40 cys encl rec'.d)

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<<y9 i/i FLORIDAPOWER 8c LIGHTCOMPANY February 25, 1977 L-77-60 Office of Nuclear Reactor Regulation Attention:

Mr. Dennis L. Ziemann, Chief Operating Reactors Branch g2 Division of Operating Reactors U.

S. Nuclear Regulatory Commission Washington, D.C.

20555

Dear Mr. Ziemann:

Re:

St. Lucie Unit 1 Docket No. 50-335 Pressure-Tem erature Limits Your letter of February 15, 1977 requested that we revise our pressure-temperature limits for the first, 2 effective years of full power operation (Technical Specification Figure 3.4-2a) to provide additional margin to assure compliance with Appendix G to 10 CFR Part 50.

More specifically, you requested that we commit to using Figure 3.4-2b as our present limit, and to submit a subsequent application for license amend-ment to formally change the Technical Specifications in a manner to assure compliance with Appendix G.

We have studied several references (SRP 5.3.2, BTP MTEB No. 5-2, and Appendix G to 10 CFR Part,

50) dealing with fracture toughness requirements and have developed a new curve with which to replace Figure 3.4-2a.

We feel that our new curve conservatively depicts operating conditions for,up to 5 effective years of full power operation, and that it will not. be necessary for us to commit in the interim to using Figure 3.4-2b. (see attached)

To allow for an orderly transition to our new curve, we plan to begin using it by March 4, 1977.

. We will then -submit an application for license amendment to replace the present Figure 3.4-2a with our new curve by March 18, 1977.

Very t y yours, Robert E. Uhrig Vice President REU/MAS/ms cc:

Norman C. Moseley, Region II Robert Lowenstein, Esquire QOQ'EOPLE...

SERVING PEOPLE

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