ML20203A444

Forwards Document Faxed to M Kitlan Re Issues for an Upcoming Telephone Conference

ML20203A444
Person / Time
Site:	Catawba
Issue date:	02/03/1998
From:	Tam P NRC (Affiliation Not Assigned)
To:	NRC (Affiliation Not Assigned)
References
TAC-M99629, TAC-M99630, NUDOCS 9802240034
Download: ML20203A444 (2)

Text

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February 3,1996 MEMORANDUM FOR: Docket File '

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FROM: Peter S. Tam, Senior Project Manager .

Project Directorate ll 2 Division of Reactor Projects . l/ll Office of Nuclear Reactor Regulation 4 (>. . h

SUBJECT:

CATAWBA NUCLEAR STAHON ISSUES FOR AN UPCOMING TELEPHONE CONFERENCE (TAC M99629 AND M99630)

The attached 1 page document was faxed to Mike Kitlan of Duke Energy Corporation. The document contains issues to be discussed in an upcoming telephone conference. This memorandum and the attachment do not convey a formal request for information or represent an NRC stuff position.

Docket Numbers 50-413 and 50-414 Distnbuil0D PUBLIC

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1 On Page B 3/4 415 of the BASES you indicate that *Either PORV has adequate i relieving capability to protect the Reactor Coolant System from ovepressurization when the transient is limited to either... (2) the start of a Safety Injection pump and its injection into a water solid Reactor Coolant System." You also state *To ensure that mass and heat input transients more severe than those assumed cannot occur, Technical Specifications require lockout of all but one Safety injection pump and all but one centrifugal charging pump while in MODES 4,5, and 6 with the reactor vessel head installed.. " These statements in that the TS allow a sufety inject!on pump as well as a charging pump to be capable of injection in the LTOP region while a PORV is stated to be capable of relieving the input from one safety injection pump (no discussion on the additional centrifugal charging pump), Provide analyses consistent with the T5 or modify the existing TS to bring them into agreement with the analyses, in addition, identify your current TS restrictions (standard format included this restriction) on accumulater discharge valves with respect to L ~)PS.

2 On Page 4 of Attachment 3 you proposed to relocate the instrument uncertainty margins from the Catawba Technical Specifications to licensee controlled procedures. It is the staffs position that Technical Specification set points (specifically the LTOP set points for this case) must account for instrument uncertainties. Modify you submittal to account for instrument uncertainty and provide a calculation of the set points identifying all of the separate components (P/T limit, analyticallift set point, overshoot, etc.).

3 Provide an evaluation / analysis of the adequacy of the required vent area of 4.5 square inches (TS 4.4.9.3) with the new limits.

4 On Page 3 of Attachment 3 you stated "This evaluation demonstrated that the 285'F enable temperature used for both units remains conservative relative to the RTwo, +

90'F enable temperature. The enable temperature should account for temperature lastrument uncertainty and the temperature difference from the inside wall of the vessel to the quarter thickness location. Provide a calculation of the enable temperature, for each unit, which accounts for these effects.

5 Provide your LTOP analyses or a summary of the LTOP analyses, and the LTOP methodology for staff review.

6 Provide and justify your minimum temperature for boltup/ pressurization with respect to LTOP (i.e., show that the lower end temperature at which the system can potentially pressurize is bounded by your LTOP analyses). This must also account for instrument uncertainty,