ML20212F287

Forwards Correction to Bases Page 2-7 Change by Ltr,

ML20212F287
Person / Time
Site:	Millstone
Issue date:	10/21/1997
From:	Andersen J NRC (Affiliation Not Assigned)
To:	Carns N, Loftus P NORTHEAST NUCLEAR ENERGY CO.
References
TAC-M99643, NUDOCS 9711040247
Download: ML20212F287 (5)

Text

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Mr. Neil S. Carns October 21, 1997 Senior Vice President and Chief Nuclear Officer Northeast Nuclear Energy Company

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c/o Ms. Patricia A. Loftus Director - Regulatory Affairs P.O. Box 128 Waterford, CT 06385

SUBJECT:

MILLSTONE NUCLEAR POWER STATION, UNIT 3 - CORRECTION TO BASES CHANGE LETTER DATED SEPTEMBER 29, 1997 (TAC NO. M99643)

Dear Mr. Carns:

By letter dated September 29, 1997, the Commission responded to your letter of September 18, 1997, concerning a change to Millstone Nuclear Power Station, Unit 3, Technical Specification (TS) Bases Section 2.2.1, Reactor Trip System Instrumentation Setpoints. The change clarified the function of the P-6 interlock for increasing as well as decreasing reactor power. The P-6 interlock is a permissive which, on increasing power during reactor startup, becomes active above the interlock allowable value specified in TS Table 2.2-1 to allow the manual block of the source range high flux reactor trip, and doenergizes the high voltage to the source range detectors. On decreasing i

power during reactor shutdown, the P-6 interlock deactivates to reinstate the source range high flux trip, and the source range detectors are reenergized.

The Bases section now includes a statement that the P-6 deactivation will occur at a value below its activation value and may be calibrated to occur below the P-6 interlock allowable value to prevent overlap and chatter based upon the expected bistable drift.

On the enclosed TS Bases page,(B 2-7), we neglected to date the page on the bottom right corner.

Enclosed is the corrected TS Bases page 2-7.

We regret any incorvenience this oversight may have caused.

Sincerely, Orir,inal signi by:

James W. Andersen, Project Manager Special Projects Office - Licensing Office of Nuclear Reactor Regulation

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Docket No. 50-423

Enclosure:

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SUBJECT:

MILLSTONE NUCLEAR POWER STATION, UNIT 3 - CORRECTION TO BASES CHANGE LETTER DATED SEPTEMBER 29,1997(TACNO.M99643)

Dear Mr. Carns:

Sy letter dated September 29, 1997, the Commission responded to your letter of September 18, 1997, concerning a change to Millstone Nuclear Power Station, Unit 3, Technical Specification (TS) Bases Section 2.2.1, Reactor Trip System Instrumentation Setpoints.

The change clarified the function of the P-6 interlock for increasing as well as-decreasing reactor power.

The P-6 interlock is a permissive which, on increasing power during reactor startup, becomes active above the interlock allowable value specified in TS Table 2.2-1 to allow the manual block of the source range high flux reactor

• rip, and deenergizes the high voltage to the source range detectors. On uecreasing power during reactor shutdown, the P-6 interlock deactivates to reinstate the source range high flux trip, and the source rs.nge detectors are reenergized.

The Bases section now includes a statement that the P-6 deactivation will occur at a value below its activation value and may be calibrated to occur below the P-6 interlock allowable value to prevent overlap and chatter based upon the expected bistable drift.

On the enclosed TS Bases page (B 2-7), we neglected to date the page on the bottom right corner.

Enclosed is the corrected TS Bases page 2-7.

We regret any inconvenience this oversight may have caused.

Sincerely, a

ndersen, Project Marager Special Projects Office - Licensing Office of Nuclear Reactor Regulation Docket No. 50-423

Enclosure:

As stated cc w/ enc 1:

See next page

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Hr. Neil S. Carns Octoler 21, 1997 Senior Vice President and Chief Nuclear Officer Northeast Nuclear Energy Company c/o Ms. Patricia A. Loftus Director - Regulatory Affairs P.O. Box 128 Waterford, CT 06385

SUBJECT:

MILLSTONE NUCLEAR POWER STATION, UNIT 3 - CORRECTION TO BASES CHANGE LETTER DATED SEPTEMBER 29, 1997 (TAC NO. M99643)

Dear Mr. Carns:

fy letter dated September 29, 1997, the Commission responded to your letter of September 18, 1997, concerning a change to Hillstone Nuclear Power Station, Unit 3 Technical Specification (TS) Bases Section 2.2.1, Reactor Trip System Instrumentation Setpoints. The change clarified the function of the P-6 interlock for increasing as well as decreasing reactor power.

The P-6 interlock is a permissive which, on increasing power during reactor startup, becomes active above the interlock allowable value specified in TS Table 2.2-1 to allow the manual block of the source range high flux reactor trip, and deenergizes the high voltage to the source range detectors.

On decreasing power during reactor shutdown, the P-6 interlock deactivates to reinstate the source range high flux trip, and the source range detectors are reenergized.

The Bases section now includes a statement that the P-6 deactivation will occur at a value below its activation value and may be calibrated to occur below the P-6 interlock allowable value to prevent overlap and chatter based upon the expected bistable drift.

On the enclosed TS Bases page (B 2-7), we neglected to date the page on the bottom right corner.

Enclosed is the corrected TS Bases page 2-7.

We regret any inconvenience this oversight may have caused.

Sincerely.

Origital signed by:

James W. Andersen, Project Manager Special Projects Office - Licensing Office of N Jclear Reactor Regulation Docket No. 50-423

Enclosure:

As stated cc w/ enc 1:

See next page 9711040247 971021

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October 21, 1997 Mr. Neil S. Carns Senior Vice President and Chief Nuclear Officer Northeast Nuclear Energy Company c/o Ms. Patricia A. Loftus Director - Regulatory Affairs P.O. Box 128 Waterford, CT 06385

SUBJECT:

MILLSTONE NUCLEAR POWER STATION, UNIT 3 - CORRECTION TO BASES CHANGE LETTER DATED SEPTEMBER 29, 1997 (TAC NO. M99643)

Dear Mr. Carns:

By letter dated September 29, 1997, the Commission responded to your letter of September 18, 1997, concerning a change to Millstone Nuclear Power Station, Unit 3, Technical Specification (TS) Bases Section 2.2.1, Reactor Trip System Instrumentation Setpoints.

The change clarified the function of the P-6 interlock for increasing as well as decreasing reactor power.

The P-6 interlock is a permissive which, on increasing power during reactor startup, becomes active above the interlock allowable value sperf #ied in TS Table 2.2-1 to allow the manual block of the source range high flu:,eactor trip, and deeneNizes the high voltage to the source range detectors. On decreasing pow'.e during reactor shutdown, the P-6 interlock deactivates to reinstate the s'.,urce range high flux trip, and the source range detectors are reenergized.

The Bases section now includes a statement that the P-6 deactivation will occur at a value below its activation value and may be calibrated to occur below the P-6 interlock allowable value to prevent overlap and chatter based upon the expected bistable drift.

On the enclosed TS Bases page (B 2-7), we neglected to date the page on the bottom right corner.

Enclosed is the corrected TS Bases page 2-7.

We regret any inconvenience this oversight may have caused.

Sincerely, a

ndersen, Project Manager Special Projects Office - Licensing Office of Nuclear Reactor Regulation l

Docket No. 50-423

Enclosure:

As stated l

cc w/ enc 1:

See next_page

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l' LIMITINS SAFETY SYSTEN SETTINRS BASES o

Steam Generator Water Level The Steam Generator Water Level Low Low trip protects the reactor from loss of heat sink in the event of a sustained steasVfeedwater flow mismatch resulting from loss of normal feedwater.

The specified Setpoint provides allowances for starting delays of the Auxiliary Feedwater System.

Low Shaft Snead - Reactor Coolant P-s l

The Low Shaft Speed Reactor Coolant Pumps trip provides core protection to prevent DN8 in the event of a sudden significant decrease in reactor coolant pump speed (with resulting decrease in flow) on two reactor coolant pumps in any two o>erating reactor coolant loops.

The trip setpoint ensures that a reactor trqp will be generated considering instrument errors and j

response times, in sufficient time to allow the DN8R to be maintained greater than the design above limit following a four pump loss of flow event.

j Turbine Trin A Turbine trip initiates a Reactor trip. On decreasing power the Reactor trip from the Turbine trip is automatically blocked by P-9 (a power level of i

approximately 50% of RATED THERMAL POWER); and on increasing power, reinstated

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automatically by P-9.

4 Safety In_1ection Innut from ESF If a Reactor trip has not already been generated by the Reactor Trip System instrumentation, the ESF automatic actuation logic channels will initiate Reactor trip upon any signal which initiates a Safety Injection.

The ESF instrumentation channels which initiate a safety Injection signal are t

shown in Table 3.3-3.

Reactor Trin System Interlocks The Reactor Trip System interlocks perform the following functions:

P-6 On increasing power, P-6 becomes active above the Interlock Allowable Value specified on Table 2.2-1 to allow the manual block of the Source Range trip (i.e., prevents premature block.of the Source Range trip during reactor startus) and deenergizes the high voltage to the detectors.

On decreasing power during a reactor shutdown, Source Range Level trips are automatically reactivated and high voltage restored when P 6 deactivates.

The P-6 deactivation will occur at a -value below its activation value and may be calibrated. to. occur below the-P 6 Interlock Allowable Value s >ecified on Table-2,2-1 to prevent overlap and chatter based upon t se expected bistable drift.

-P7

_On increasing power P 7 automatically enables Reactor trips on low flow in more than one reactor coolant loop, reactor coolant pump low shaft speed, pressurizer low pressure and pressurizer high level. On decreasing power, the above listed trips are automatically blocked.

NILLSTONE UNIT 3' 8 t-7 Revised by NRC Letter eue dated Sootember 29. 1997

i, Northeast Nuclear Energy Company Millstone Nuclear Power Station l

Unit 3 CC:

Lillian M. Cuoco, Esquire Mr. William D. Meinert Senior Nuclear Counsel Nuclear Engineer

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Northeast Utilities Service Company Massachusetts Municipal Wholesale P. O. Box 270 Electric Company Hartford, CT 06141-0270 P. O. Box 426 Ludlow, MA 01056 Mr. Kevin T. A. McCarthy, Director Monitoring and Radiation Division Joseph R. Egan, Esquire Department of Environmental Protection Egan & Associates, P.C.

79 Elm Street 2300 N Street, NW Hartford, CT 06106-5127 Washington, D.C. 20037 Regional Administrator, Region I Mr. F. C. Rothen U.S. Nuclear Regulatory Commission Vice President - huclear Work Services 475 Allendale Road Northeast Nuclear Energy Company King of Prussia, PA 19406 P. O. Box 128 Waterford, CT 06385 First Selectmen Town of Waterford Ernest C. Hadley, Esquire Hall of Records 1040 8 Main Street 200 Boston Post Road P. O. Box 549 Waterford, CT 06385 West Wareham, MA 02576 Mr. Wayne D. Lanning Mr. John Buckingham Deputy Director of Inspections Department of Public Utility Control Special Projects Office Electric Unit 475 Allendale Road 10 Liberty Square King of Prussia, PA 19406-1415 New Britain, CT 06051 Michael H. Brothers Mr. James S. Robinson Vice President - Millstone Unit 3 Manager, Nuclear Investments and Northeast Nuclear Energy Company Administration P. O. Box 128 New England Power Company Waterford, CT 06385 25 Research Drive Westborough, MA 01582 Mr. M. R. Scully, Executive Director Connecticut Municipal Electric Mr. D. M. Goebel Energy Cooperative Vice President - Nuclear Oversight 30 Stott Avenue Northeast Nuclear Energy Company Norwich, CT 06360 P. O. Box 128 Waterford, CT 06385

'Mr. David Amerine

-Recovery Officer - Nuclear Engineering and Support Northeast Nuclear Energy Company P. O. Box 128 Waterford, Connecticut 06385

Northeast Nuclear Energy Company Millstone Nuclear Power Station Unit 3 CC:

Deborah Katz, President Mr. B. D. Kenyon Citizens Awareness Network President and Chief Executive Officer P. O. Box 83 Northeast Nuclear Energy Company Shelburne Falls, MA 03170 P. O. Box 128 Waterford, CT 06385 Senior Resident Inspector Millstone Nuclear Power Station Mr. Daniel L. Curry c/o U.S. Nuclear Regulatory

roject Director Commission varsons Power Group Inc.

P. O. Box 513 2675 Morgantown Road Niantic, CT 06357 Reading, Pennsylvania 19607 Mr. Allan Johanson, Assistant Director Mr. Don Schopfer Office of Policy and Management Verification Team Manager Policy Development and Planning Division Sargent & Lundy 450 Capitol Avenue - MSf 52ERN 55 E. Monroe Str :et P. O. Box 341441 Chicago, Illinois 60603 Hartford, C1 06134-1441 i

Citizens Regulatory Commission ATTN: Ms. Susan Perry Luxton 180 Great Neck Road Waterford, Connecticut 06385 The Honorable Terry Concannon Co-Chair Nuclear Energy Advisory Council Room 4035 Legislative Office Building Capitol Avenue Hartford, Connecticut 06106 Mr. Evan W. Woollacott Co-Chair Nuclear Energy Advisory Council 128 Terry's Plain Road Simsbury, Connecticut 06070 Little Harbor Consultants, Inc.

Millstone - ITPOP Project Office P. O. Box 0630 Niantic, Connecticut 06357-0630

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