ML20212D676

Forwards Request for Addl Info Re ATWS Mitigation Sys Actuation Circuitry to Complete Review of 870123 Submittal, Atws/Amsac Design Description. Response Requested within 45 Days

ML20212D676
Person / Time
Site:	Mcguire, Catawba, McGuire, 05000000
Issue date:	02/27/1987
From:	Hood D Office of Nuclear Reactor Regulation
To:	Tucker H DUKE POWER CO.
References
TAC-59111, TAC-59112, NUDOCS 8703040172
Download: ML20212D676 (5)

Text

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Rx Do ket s: 50-369 and 50-370 Mr. H. B. Tucker, Vice President Nuclear. Production Department 2 7 FEB 1987 Duke Power Company ,

C 422 South Church Street Charlotte, North Carolina 28242

Subject:

Request. for Additional Information Concerning the ATWS/AMSAC Design at the McGuire and Catawba Nuclear Stations the NRC Staff'has reviewed your submittal dated January 23, 1987 concerning the ATWS mitigation system actuation circuitry and finds that additional 0; ' information, identified in the enclosure, is required to complete our 4,

evaluation.

o Youp response to the enclosure is requested within 45 days of this letter.

Contact me at'(301) 492-8961 or K. Jabbour at (301) 492-7367 if you have any questions.

Sincerel ,

5 Darl Hood, Project Manager PWR Project Directorate #4 Division of PWR Licensing-A

Enclosure:

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V ENCLOSURE REQUEST FOR ADDITIONAL INFORMATION CONCERNING ANTICIPATED TRANSIENTS WITHOUT SCRAM CATAWBA NUCLEAR STATION, UNITS 1 AND 2 MCGUIRE NUCLEAR STATION, UNITS 1 AND 2 The staff has reviewed the submittal from the licensee, Duke Power Company, dated January 23, 1987,

Subject:

"ATWS/AMSAC Design Description."

As a result of the review the staff requests the following additional infonnation:

l .'

' Identify the types o.f isolation devices used to isolate the AMSAC from Class IE circuits.

2.

Provide a block diagram of the ATWS/AMSAC design. As a minimum, the block diagram should show the Class IE to non-Class 1E interfaces and the classification and point of application of the power source for the AMSAC equipment and isolation devices.

3. -

I The WCAP-10858P-A report, as approved by the Commission, specifies'a 30-second time delay upon the initiation of the AMSAC signal and a 120-second time delay upon the termination of the AMSAC signal. The proposed system design does not provide for these two time delays.

Discuss why they are not included in the system design.

/

4 Expand upon the technical merits of inhibiting AMSAC below the 56% power level rather, than the 70% power level specified by WCAP-10858-A.

' Justify the 56% power level.

5.

Section 3.5 of your submittal states that FEATURES will be provided to assist in maintenance. Discuss the nature of these features.

6.

Your submittal did not verify that the disallowed methods of bypassing are not utilized. Under what conditions are the actions of lifting -leadsi

< ve-pulling fuses, tripping breakers, or physically blocking relays employed?

7 Section 3.13 implies that the operator can abort the mitigative action of AMSAC before it goes to completion. This is contrary to the approved design described in WCAP-10858P-A. Clarify this section of your submittal and justify the proposed design.

-turbine trip signal before the turbine trios?Also, can the operator abort the AMSAC 8.

The logic diagrams with your submittal do not show all of the operator l- initiated resets, inhibits, blocks, and bypasses described in the submittal.

Re-submit or supplement the logic diagrams showing the logic function of all operator initiated actions.

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9. The Westinghouse Owner's Group (WOG) plans to transmit' to the NRC a supplement to WCAP-10858P-A containing a new permissive power level (40%)

for AMSAC and new actuation setpoints for the optional designs previously discussed in the WCAP. Discuss whether the new permissive and new setpoints have been taken into account for both the McGuire and Catawba AMSAC designs.

If not, state whether you intend to provide revised permissive level and actuation setpoints and when.

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' Mr. H. B. Tucker Duke Power Company-McGuire Nuclear Station cc: '

Mr. A.V. Carr, Esq. . Dr. John M. Barry Duke Power Company P. 0. Box 33189 Department of Environmental Health Mecklenburg County,

_422 South Church Street 1200 Blythe Boulevard Charlotte, North Carolina 28242 Charlotte, North Carolina 28203-County Manager of Mecklenburg County 720 East Fourth Street Charlotte, North Carolina 28202 Chairman, North Carolina Utilities Commission Mr. Robert Gill Dobbs Building Duke Power Company -

Nuclear Production Department 430 North Salisbury Street P. O. Box 33189 Raleigh, North Carolina 27602 Charlotte, North Carolina 28242 Mr. Dayne H. Brown, Chief J. Michael McGarry, III, Esq. Radiation Protection Branch Bishoo, Liberman, Cook, Purcell Division of Facility Services ~

and Reynolds Department of Human Resources 1200 Seventeenth Street, N.W. 701 Barbour Drive Washington, D. C. 20036 Raleigh, North Carolina 27603-2008 Senior. Resident Inspector.

c/o U.S. Nuclear Regulatory Commission Route 4, Box 529 Hunterville, North Carolina 28078 Regional Administrator, Region II U.S. Nuclear Regulatory Commission, 101 Marietta Street, N.W., Suite 2900 Atlanta, Georgia 30323 e ~: .. _ , ,.

i L. L. Williams Area Manage ~r, Mid-South Area ESSD Projects Westinghouse Electric Corporation MNC West Tower - Bay 239

! P. O. Box 355 Pittsburgh, Pennsylvania 15230 1

l

Mr. H. B. Tucker Duke Power Company Catawba Nuclear Station cc:

A.V.-Carr, Esq. North Carolina Electric Membership Duke Power Company Corp.

- 422 South Church Street 3400 Sumner Boulevard Charlotte, North Carolina 28242 P.O. Box 27306 Raleigh, North Carolina 27611 J. Michael McGarry, III, Esq.

Bishop, Liberman, Cook, Purcell Saluda River Electric Cooperative, and Reynolds Inc.

1200 Seventeenth Street, N.W. P.O. Box 929 Washington, D. C. 20036 Laurens, South Carolina 29360 North Carolina MPA-1 Senior Resident Inspector Suite 600 Route 2, Box 179N 3100 Smoketree Ct. York, South Carolina 29745 P.O. Box 29513 Raleigh, North Carolina 27626-0513 Regional Administrator, Region II

~ U.S. Nuclear Regulatory Comission, L.L. Williams 101 Marietta Street, NW, Suite 2900

' Area Manager, Mid-South Area Atlanta, Georgia 30323 ESSD Projects Westinghouse Electric Corp.

MNC West Tower - Bay 239 P.O. Box 355 Pittsburgh, Pennsylvania '15230 Mr. Heyward G. Shealy, Chief Bureau of Radiological Health South Carolina Department of Health and Environmental Control 2600 Bull Street Columbia, South Carolina 29201 County Manager of York County York County Courthouse Karen E. Long York South Carolina 29745 Assistant Attorney General 7-~ = -

N.C. Department of Justice ' ~

Richard P. Wilson, Esq. P.O. Box 629 Assistant Attorney General Raleigh, North Carolina 27602 i S.C. Attorney General's Office

! P.O. Box 11549 Spence Perry, Esquire L Columbia, South Carolina 29211 General Counsel i

Federal Emergency Management Agency l Piedmont Municipal Power Agency Room 840 l 100 Memorial Drive 500 C Street Greer, South Carolina 29651 Washington, D. C. 20472 Mr. Michael Hirsch Federal Emergency Management Agency Office of the General Counsel Room 840 500 C Street, S.W.

Washington, D. C. 20472

! Brian P. Cassidy, Regional Counsel Federal Emergency Management Agency, Region I J. W. McCormach POCH g Boston, Massachusetts 02109