ML20238E545

Forwards Addl Info Re 870909 Application for Amend to License NPF-49 Re Resistance Temp Detectors Bypass Elimination,Per NRC 871207 Request

ML20238E545
Person / Time
Site:	Millstone
Issue date:	12/23/1987
From:	Mroczka E, Sears C NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
B-12774, NUDOCS 8801050219
Download: ML20238E545 (4)

Text

- - - - - - - - _ _ - - - _ - _ - _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __

8,

• General Offices

• Seiden Street, Berlin, Connecticut w umuncer we ow.cc ,

1 msw .m.o.unuac. < c< .

P.O. BOX 270 Iv HARTFORD. CONNECTICUT 06141-0270 k ' J aaw.c.N.$Uch,

.sca.aeiao.c . (203) 665-5000 December 23, 1987 Docket No. 50-423 B12774 Re: 10CFR50.90 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555

References:

(1) E. J. Mroczka letter to U.S. Nuclear Regulatory Commission, Cycle 2 Reload, Technical Specification Change Request, dated September 9, 1987.

(2) E. J. Mroczka letter to U.S. Nucicar Regulatory Commission, RTD Bypass Elimination Licensing Report for Millstone Unit No. 3, WCAP-11496 (Proprietary),

WCAP-11497 (Non-Proprietary), dated September 9, 1987.

(3) E. J. Mroczka letter to U.S. Nuclear Regulatory Commission, Supplemental Information - Resistance Temperature Detectors (RTD) Bypass Elimination Licensing Report, dated November 25, 1987.

Gentlemen:

Millstone Nuclear Power Station, Unit No. 3 Amendment to Facility Operating License NPF-49 Supplemental Informat. ion Resistance Temperature Detectors (RTD)

Bypass Elimination Licensing leport On September 9, 1987, Northeast Nuclear Energy Company (NNECO) submitted a proposed amendment to Facility Operating License NPF-49 for Millstone Unit No. 3 (Reference (1)). That amendment would revise certain tech-nical specifications required for Cycle 2 operation of Millstone Unit No. 3. A technical report in r;upport of the proposed amendment was l submitted to the NRC (Reference (2)) on September 9, 1987. In Reference (3), NNECO transmitted responses to the NRC questions con-corning the RTD bypass elimination report for Millstone Unit No. 3 raised during a telephone conference between the NRC Staff and NNECO representatives on November 19, 1987. The attached additional informa-tion concerning the RTD bypass elimination report for Millstone Unit No. 3 is being acnt in response to rn NRC request made during a telephone conference between the NRC and NNECO representatives on December 7, 1987.

10 hh f e T

=

, , U.S. Nucrear R6gulatory Commission i, B12774/ Pegs 2 December 23, 1987 We believe the information contained in Attachment 1, coupled with the information provided in References (1), (2), and (3), provides a complete basis for approval of the requested amendment. Of course, should the Staff have any additional questions, NNECO is available to discuss the Staff's concerns.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY b .b . Q E. J. Mroczka M Senior Vice President L'eavL By: C. F. Sears Vice President cc: W. T. Russell, Region I Administrator R. L. Ferguson, NRC Project Manager, Millstone Unit No. 3 W. J. Raymond, Senior Resident Inspector, Millstone Unit Nos. 1, 2, and 3 l

1 l

i 1

a

.c ..

.- .

• d Docket No. 50-423 B12774 Attachment 1 Responses to Request for Mditional Information RTD Bypass Elimination Licensing Report l

Millstone Unit No. 3 1

1 December 1987  !

I i

\

1 l

l I

1

% l

p

• ,.e c . .

q-Millstone Unit No. 3 Responses to Request for Additional Information 1

i- RTD Bypass Elimination Licensing Report Item Is the'feedwater venturi cleaned at the beginning of every cycle? If the venturi is not cleaned prior.to the calorimetric flow measurement because no fouling-is detected, an error component should be added.

Response

Prior to the start of each cycle, the venturis will be verified to be

-clean.by performing a visual inspection (borascope, photography, etc.)

through inspection ports installed during t' .s refueling outage and cleaned when necessary. If the venturis are not cleaned, an additional 0.1 percent will be added to the total reactor coolant flow measurement uncertainty. Technical. Specification Sections 4.2.3.1.6 and 4.2.3.2.6 will be revised to reflect the above commitment and submitted to the NRC for approval.

Item Indicate your plans to check and confirm the accuracy of the.new hot leg.

temperature measurements by comparison against past measurements by RTDs in bypass loops.

Response

During Cycle 2 start-up, NNECO will collect the new hot leg and cold leg narrow range temperature measurements at 100 percent power and compare Tavg and AT measurements to the values measured during the Cycle 1 start-up test program.

Item Is there any deviation from the configuration specified in Reference (2)?

Response

There is no deviation from the RTD configuration documented in Reference (2) and as clarified in response to Item 5 of Attachment 1 to Reference (3).

%