ML20216D891

Forwards Revised TS Bases Section 3/4.4.9.Changes Consisted of Removing One Example Used on Bases as Means of Providing Cold Overpressure Protection

ML20216D891
Person / Time
Site:	Millstone
Issue date:	04/09/1998
From:	Andersen J NRC (Affiliation Not Assigned)
To:	Bowling M, Loftus P NORTHEAST NUCLEAR ENERGY CO.
References
TAC-MA1221, NUDOCS 9804160025
Download: ML20216D891 (5)

Text

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April 9,1998 i

. Mr. Martin L. Bowling, Jr.

Recovery Officer - Millstone Unit No. 2 Northeast Nuclear Enargy Company c/o N Patricia A. Loftus Director-Regulatory Affairs P. O. Box 128 Waterford, Connecticut 06385

SUBJECT:

CORRECTION TO TECHNICAL SPECIFICATION BASES SECTION 3/4.4.9 (TAC NO. MA1221)

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Dear Mr. Bowling:

By letter dated April 1,1998, we sent you revised Technical Specification Bases Section 3/4.4.9. The change consisted of removing one of the examples used in the Bases as a means of providing cold overpressure protection.

The staff found that the revised Bases page did not include an issue date. Please replace Bases page B 3/4 4-17 with the enclosed revised Bases page. We regret any inconvenience this may have caused.

Sincerely, original signed by:

James W. Andersen, Project Manager Special Projects Office - Licensing Office of Nuclear Reactor Regulation Docket No. 50-423 DISTRIBUTION GHill(2) f4BblBistPUs)

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April 9, 1998 Mr. Martin L. Bowling, Jr.

Recovery Officer-Millstone Unit No. 2 '

l Northeast Nuclear Energy Company l

clo Ms. Patricia A. Loftus l

Director-Regulatory Affairs P. O. Box 128 Waterford, Connecticut 06385

SUBJECT:

CORRECTION TO TECHNICAL SPECIFICATION BASES SECTION 3/4.4.9 (TAC NO. MA1221) l

Dear Mr. Bowling:

By letter dated April 1,1998, we sent you revised Technical Specification Bases Section 3/4.4.9.

The change consisted of removing one of the examples used in the Bases as a means of providing cold overpressure protection.

The staff found that the revi. sed Bases page did not include an issue date. Please replace Bases page B 3/4 4-17 with the enclosed revised Bases page. We regret any inconvenience this may have caused, Sincerely,

.L W. Andersen, Project Manager Special Projects Office - Licensing Office of Nuclear Reactor Regulation Docket No. 50-423

Enclosure:

As stated cc w/ encl: See next page j

i REACTOR COOLANT SYSTEM BASES OVERPRESSURE PROTECTION SYSTEMS (continued) temperature overpressure transient. Setting both valves to the values of Figure 3.4-4a and Figure 3.4-4b within the tolerance allowed for the calibration accuracy, ensures that the Reference 1 limits will not be exceeded for the j

analyzed isothermal events.

When a PORY is opened, the rel" ease of' coo'lant'wi11 cause the pressure increase

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to slow and reverse. As the PORY releases coolant, the RCS pressure decreases until a reset pressure is reached and the valve is signaled to close.

The pressure continues to decrease below the reset pressure as the valve closes.

RHR Suction Relief Valve Recuirementt The isolation valves between the RCS and the RHR suction relief valves must be open to make the RHR suction relief valves OPERABLE for RCS overpressure mitigation. The RHR suction relief valves are spring loaded, bellows type water relief valves with setpoint tolerances and accumulation limits established by Section III of the American Society of Mechanical Engineers (ASME) Code (Ref. 3) for Class 2 relief valves.

When the RHR system is operated for decay heat removal or low pressure letdown control, the isolation valves between the RCS and the RHR suction relief valves are open, and the RHR suction relief valves are exposed to the RCS and are able to relieve pressure transients in the RCS.

RCS Vent Recuirements

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Once the RCS 1s depressurized, a vent exposed to the' containment atmosphere will maintain the RCS at containment ambient pressure in an RCS overpressure transient, if the relieving requirements of the transient do not exceed the capabilities of the vent. Thus, the vent path must be capable of relieving the flow resulting from the limiting mass or heat input transient, and maintaining pressure below the P/T limits for the analyzed isothermal events.

For an RCS vent to meet the flow capacity requirement, it requires removing a Pressurizer safety valve, removing a Pressurizer manway, or similarly l establishing a vent by opening an RCS vent valve provided that the opening meets the size requirements. The vent path must be above the level of reactor coolant, so as not to drain the RCS when open.

MILLSTONE - UNIT 3 8 3/4 4-17 Amendment No. # 7, oses Revised by NRC Letter etM 04/01/98

3 Northerst Nucle:r Energy C mpany Millstone Nucleir Pow;r Station Unit 3 cc:

Lillian M. Cuoco, Esquire Mr. William D. Meinert Senior Nuclear Counsel Nuclear Engineer Northeast Utilities Service Company Massachusetts Municipal Wholesale P. O. Box 270 Electric Company l

Hartford, CT 06141-0270 P.O. Box 426 i

Ludlow, MA 01056 l

Mr. Kevin T. A. McCarthy, Director l

Monitoring and Radiation Division Joseph R. Egan, Esquire l

Department of Environmental Protection Egan & Associates, P.C.

l 79 Elm Street 2300 N Street, NW l-Hartford, CT- 06106-5127

-Washington, DC 20037 l

Regional Administrator, Region i Mr. F. C. Rothen U.S. Nuclear Regulatory Commission Vice President - Work Services 475 Allendale Road Northeast Utilities Service Company King of Prussia, PA 19406 P. O. Box 128 Waterford, CT 06385 l-First Selectmen Town of Waterford Ernest C. Hadley, Esquire Hall of Records 1040 B Main Street 200 Boston Post Road P.O. Box 549 l

Waterford, CT 06385 West Wareham, MA 02576 l

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 Mr. M. H. Brothers Mr. James S. Robinson, Manager Vice President - Operations Nuclear Investments and Administration Northeast Nuclear Energy Company New England Power Company l

P.O. Box 128 25 Research Drive l

Waterford, CT 06385 Westborough, MA 01582 l

Mr. M. R. Scully, Executive Director Mr. D. M. Goebel Connecticut Municipal Electric Vice President - Nuclear Oversight Energy Cooperstwe Northeast Utilities Service Company 30 Stott Avenue P. O. Box 128 Norwich, CT 06360 Waterford, CT 06385 i

Mr. David Amerine Deborah Katz, President j

Vice President - Nuclear Engineering Citizens Awareness Network and Support P.O. Box 83 l

Northeast Utilities Service Company Shelbume Falls, MA 03170 P. O. Box 128 j

Waterford, CT 06385 l

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N:rthe:st Nucleir Energy C:mpany Millstone Nuclear Power Station Unit 3 i

cc:

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Mr. Allan Johanson, Assistant Director Mr. Don Schopfer Office of Policy and Management Verification Team Manager Policy Development and Planning Sargent & Lundy l

Division 55 E. Monroe Street 450 Capitol Avenue - MS# 52ERN Chicago,IL 60603 P. O. Box 341441 Hartford, CT 06134-1441 Mr. J. P. McElwain Vice President (Acting) - Millstone 3 Citizens Regulatory Commission Northeast Nuclear Energy Company l

ATTN: Ms. Susan Perry Luxton P.O. Box 128 180 Great Neck Road Waterford, CT 06385 Waterford, CT 06385 Mr. G. D. Hicks The Honorable Terry Concannon Unit Director-Millstone Unit 3 Nuclear Energy Advisory Council Northeast Nuclear Energy Company Room 4035 P.O. Box 128 Legislative Office Building Waterford, CT 06385 Capitol Avenue Hartford, CT 06106 Senior Resident inspector Millstone Nuclear Power Station Mr. Evan W. Woollacott c/o U.S. Nuclecr Regulatory Commission Co-Chair P. O. Box 513 Nuclear Energy Advisory Council Niantic, Connecticut 06357 128 Terry's Plain Road Simsbury, CT 06070 Attomey Nicholas J. Scobbo, Jr.

Ferriter, Scobbo, Caruso, Rodophele, PC '

i Little Harbor Consultants, Inc.

1 Beacon Street,11th Floor Millstone -ITPOP Project Office Boston, MA 02108 P.O. Box 0630 Niantic, CT 06357-0630 Mr.B.D. Kenyon Chief Nuclear Officer-Millstone Northeast Nuclear Energy Company P.O. Box 128 Waterford, CT 06385 Mr. Daniel L. Curry Project Director Parsons Power Group Inc.

2675 Morgantown Road l

Reading, PA 19607

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