ML20212F124

Forwards Request for Addl Info Re 861001 Request for Tech Specs Mod Relaxing Requirements for Misaligned Control Element Assemblies.Response Requested within 30 Days of Ltr Receipt

ML20212F124
Person / Time
Site:	Calvert Cliffs
Issue date:	01/06/1987
From:	Mcneil S Office of Nuclear Reactor Regulation
To:	Tiernan J BALTIMORE GAS & ELECTRIC CO.
References
NUDOCS 8701090476
Download: ML20212F124 (3)

Text

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January 6, 1987 Distribution Docket Nos. 50-317 (EFocketJHed ACRS (10) and 50-318 NRC/ Local PDR PKreutzer PBD-8 Feading SAMcNeil FMiraglia 0GC-Bethesda EJordan BGrimes Mr. J. A.-Tiernan JPartlow NThompson Vice President-Nuclear Energy Gray File 3.2a Baltirpore Gas & Electric Company P. O. Box 1475 Baltimore, MD 21203

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION - CEA MISALIGNMENT AMENDMENT PEQUEST Your submittal dated October 1,1986, requested modification of Technical Specification 3/4.1.3, " Movable Control Assemblies," to relax the requirements for misaligned control element assemblies (CEA's). We have determined that additional information is required to ccmplete our review. The request for additional infonnation is enclosed.

Please provide the information as requested within 30 days following the receipt of this letter to permit the expeditious completion of our review. If additional time is needed to provide the requested information, please inform us within 15 days of your proposed schedule for providing this information.

This request for information affects fewer than 10 respondents; therefore OMB clearance is not required under P.L.96-511.

Sincerely,

/s/

Scott Alexander McNeil, Project Manager PWR Project Directorate #8 Division of PWR Licensing-B

Enclosure:

As stated cc: See next page PBD-8: PBD 8: PBD-8:

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i$ Mr. J. A. Tiernan Baltimore Gas & Electric Company Calvert Cliffs Nuclear Power Plant l

cc:

Mr. William T. Bowen, President Regional Administrator, Region I .

Calvert County Board of U.S. Nuclear Regulatory Comission l Comissioners Office of Executive Director '

Prince Frederick, Maryland 20768 for Operations 631 Park Avenue D. A. Brune, Esq. King of Prussia, Pennys1vania 19406 General Counsel Baltimore Gas and Electric Company

, P. O. Box 1475 Baltimore, Maryland 21203 Jay E. Silberg

. Shaw, Pittman, Potts and Trowbridge 2300 N Street, N.W.

Washington, DC 20037 Mr. M. E. Bowman, General Supervisor Technical Services Engineering Calvert Cliffs Nuclear Power Plent MD Rts 2 & 4 P. O. Box 1535 Lusby, Maryland 20657-0073 Resident Inspector c/o U.S. Nuclear Regulatory Commission P. O. Box 437 Lusby, Maryland 20657-0073 Bechtel' Power Corporation ATTN: Mr. D. E. Stewart Calvert Cliffs Project Engineer 15740 Shady Grove Road Gaithersburg, Maryland 20760 Combustion Engineering, Inc.

ATTN: Mr. W. R. Horlacher III Project Manager P. O. Box 500 1000 Prospect Hill Road Windsor, Connecticut 06095-0500 Department of Natural Resources Energy Administration, Power Plant Siting Program ATTN: Mr. T. Magette Tawes State Office Building Annapolis, Maryland 21204

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REQUEST FOR ADDITIONAL INFORMATION BALTIMORE GAS AND ELECTRIC COMPANY CEA MISALIGNMENT AMEFCMENT REQUEST

1. What prevents the CEA's from withdrawing after a CEA drop to counteract the reactivity decrease?

2.- Are there any CEA drops which would cause a reactor trip?

3. The requirement to reduce power after the time limit of Fig. 3.1-3 is reached allows up to I hour to reduce power to 75%.

a) Describe how the power reduction is accounted for in the analysis (linearly or instantaneously).

t b) What is the most limiting assumption for power reduction and has this been used in the derivation of the figure? For example, what is the increase in peaking for just under 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> for a dropped CEA with an initial peaking factor of 1.53 at 100% power?

c) Describe how the increase in FrTin connection with the power reduction is calculated.

4. How have you compensated for the proposal for up to 1 additional hour of power operation without making a determination of shutdown mergin with an inoperable CEA misaligned by more than 15 inches.

5. Explain why the proposed thermal power limit (up to 75% RTP) and the time required to determine shutdown margin (3-4 hours) for a CEA misaligned by more than 15 inches are less restrictive than the thermal power limit (up to 70% RTP) and the time required to determine shutdown margin (2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />) for a CEA misalignment of less than 15 inches.

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