ML20211C462

Discusses Rev to TS Bases Sections 3/4.5.2 & 3/4.5.3, Emergency Core Cooling Sys Subsystems

ML20211C462
Person / Time
Site:	Millstone
Issue date:	08/18/1999
From:	John Nakoski NRC (Affiliation Not Assigned)
To:	Necci R NORTHEAST NUCLEAR ENERGY CO.
References
TAC-MA6150, NUDOCS 9908260008
Download: ML20211C462 (5)

Text

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Mr. R. P. Necci- Vice President August 18, 1999 Nuclear Oversight and Regulatory Affairs c/o Mr. David A. Smith Northeast Nuclear Energy Company P. O. Box 128 Waterford, CT 06385-0128

SUBJECT:

MILLSTONE NUCLEAR POWER STATION, L' NIT NO. 3 - REVISION TO TECHNICAL SPECIFICATION BASES (TAC NO. MA6150)

Dear Mr. Necci:

By letter dated July 16,1999, Northeast Nuclear Energy Company (NNECO) provided the NRC with changes to Technical Specification (TS) Bases Sections 3/4.5.2 and 3/4.5.3, " Emergency Core Cooling System [ECCS) Subsystems." NNECO provided the TS Bases pages to the NRC for information only.

As you are aware, the TS Bases are not'part of the TS as defined by 10 CFR 50.36. Changes _

to the TS Bases may voluntarily be made in accordance with the provisions of 10 CFR 50.59.

Should the proposed change involve an unreviewed safety question pursuant to 10 CFR 50.59(a)(2), or involve a change in the interpretation of implementation of the TS (i.e.,

constitute a TS change), then the proposed change is to be provided to the staff pursuant to the provisions of 10 CFR 50.59(c) and 10 CFR 50.90 for prior NRC review and approval.

The TS Bases you provided are hereby returned to you and should be inserted in the TS to ensure the NRC staff and NNECO have identical TS Bases pages. The staff did not perform an evaluation of your TS Bases revisions and staff concurrence with the revisions is not implied by this letter. The staff may review the evaluations that support these TS Bases revisions during future inspections of Millstone Unit 3's implementation of 10 CFR 50.59.

Sincerely, ORIGINAL SIGNED BY:

John A. Nakoski, Sr. Project Manager, Section 2 Project Directorate l Division of Licensing Project Management Office of Nuclear Reactor Regulation '

Docket No. 50-423

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..... August 18, 1999 i

Mr. R. P. Necci - Vice President i Nuclear Oversight and Regulatory Affairs I c/o Mr. David A. Smith Northeast Nuclear Energy Company P. O. Box 128 {

Waterford, CT 06385-0128

SUBJECT:

MILLSTONE NUCLEAR POWER STATION, UNIT NO. 3 - REVISION TO TECHNICAL SPECIFICATION BASES (TAC NO. MA6150)

Dear Mr. Necci:

By letter dated July 16,1999, Northeast Nuclear Energy Company (NNECO) provided the NRC with changes to Technical Specification (TS) Bases Sections 3/4.5.2 and 3/4.5.3, "Emngency Core Cooling System (ECCS) Subsystems." NNECO provided the TS Bases pages to ine NRC for information only.

As you are aware, the TS Bases are not part of the TS as defined by 10 CFR 50.36. Changes to the TS Bases may voluntarily be made in accordance with the provisions of 10 CFR 50.59.

Should the proposed change involve an unreviewed safety question pursuant to 10 CFR 50.59(a)(2), or involve a change in the interpretation of implementation of the TS (i.e.,

constitute a TS change), then the proposed change is to be provided to the staff pursuant to the provisions of 10 CFR 50.59(c) and 10 CFR 50.90 for prior NRC review and approval.

The TS Bases you provided are hereby returned to you and should be inserted in the TS to ensure the NRC staff and NNECO have identical TS Bases pages. The staff did not perform an evaluation of your TS Bases revisions and staff concurrence with the revisions is not implied by this letter. The staff may review the evaluations that support these TS Bases revisions during future inspections of Millstone Unit 3's implementation of 10 CFR 50.59.

Sincerely, -

J ihn A. Nakoski, Sr. Project Manager, Section 2 Pjoject Directorate 1 Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-423

Enclosure:

Bases page B 3/4 5-2 cc w/ encl: See next

Millstona Nuctrar Powsr Station s Unit 3 cc:

Ms. L. M. Cuoco - Mr. F. C. Rothen Senior Nuclear Counsel Vice President - Operations Northeast Utilities Service Company Northeast Utilities Service Company P. O. Box 270 P. O. Box 128 Hartford, CT 06141-0270 Waterford, CT 06385 Edward L. Wilds, Jr., Ph.D. Ernest C. Hadley, Esquire Director, Division of Radiation 1040 B Main Street

' Department of Environmental Protection P.O. Box 549 79 Elm Street West Wareham, MA 02576 Hartford, CT 06106-5127 Mr. James S. Robinson, Manager Regional Administrator, Region i Nuclear investments and Administration U.S. Nuclear Regulatory Commission New England Power Company

.475 Allendale Road 25 Research Drive King of Prussia, PA 19406 Westborough, MA 01582 First Se!ectmen Mr. R. P. Necci Town of Waterford Vice President - Nuclear Oversight and 15 Rope Ferry Road Regulatory Affairs Watedord, CT 06385 Northeast Nuclear Energy Company P. O. Box 128 , ;_.

Mr. Wayne D. Lanning, Director Waterford, CT 06385 Millstone Inspections Office of the Regional Administrator Deborah Katz, President 475 Allendale Road Citizens Awareness Network King of Prussia, PA 19406-1415 P.O. Box 83 Shelburne Falls, MA 03170 Mr. M. H. Brothers Vice President - Operations Mr. Allan Johanson, Assistant Director

' Northeast Nuclear Energy Company Office of Policy and Management P.O. Box 128 Policy Development and Planning Waterford, CT 06385 Division 450 Capitol Avenue - MS# 52ERN Mr. M. R. Scully, Executive Director P. O. Box 341441 Connecticut Municipal Electric Hartford, CT 06134-1441 Energy Cooperative 30 Stott Avenue Ms. Terry Concannon Norwich, CT 06360 Co-Chair Nuclear Energy Advisory Council Mr. J. T. Carlin 415 Buckboard Lane Vice President - Human Services Marlborro, CT 06447 Northeast Utilities Service Company P. O. Box 128 Watedord, CT 06385 i

-p Millstone Nuclear Power Station Unit 3 cc:

Citizens Regulatory Commission Mr. Evan W. Woollacott ATTN: Ms. Geri Winslow Co-Chair P. O. Box 199 Nuclear Energy Advisory Council Waterford, CT 06385 128 Terry's Plain Road Simsbury, CT 06070 Mr. William D. Meinert Nuclear Engineer f Mr. John W. Beck, President Massachusetts Municipal Wholesale

- Little Harbor Consultants, Inc. Electric Company Millstone - ITPOP Project Office P.O. Box 426 P.O. Box 0630 Ludlow, MA 01056 Niantic, CT 06357-0630 Mr. B. D. Kenyon Mr. L J. Olivier. President and Chief Executive Officer.

Senior Vice President and Nuclear Group Chief Nuclear Officer - Millstone Northeast Utilities Service Company Northeast Nuclear Energy Company P.O. Box 128 P.O. Box 128 Waterford, CT 06385 Waterford, CT 06385 Mr. D. B. Amerine Mr. C. J. Schwarz Vice President - Engineering Services Director - Unit 3 Operations Northeast Nuclear Energy Company Northeast Nuclear Energy Company. , P. O. Box 128 P.O. Box 128 Waterford, CT 06385 Waterford, CT 06385 Mr. D. A. Smith Senior Resident inspector Manager- Regulatory Affairs Millstone Nuclear Power Station Northeast Nuclear Energy Company c/o U.S.- Nuclear Regulatory Commission P. O. Box 128

- P. O. Box 513 Waterford, CT 06385 Niantic, CT 06357 Ms. Nancy Burton Nicholas J. Scobbo, Jr., Esquire 147 Cross Highway Ferriter, Scobbo, Caruso, & Rodophele, P.C. Redding Ridge, CT 00870 75 State Street,7th Floor Boston, MA 0210 I

EMERGENCY CORE COOLING SYSTEMS BASES ECCS SUBSYSTEMS'(Continued)

The Surveillance Requirements provided to ensure OPERABILITY of each component ensures that at a minimum, the assumptions used in the safety analyses are met and that subsystem OPERABILITY is aaintained. Surveillance Requirements for throttle valve position stops and flow balance testing provide assurance that proper ECCS flows will be maintained in the event of a LOCA. Maintenance of proper flow resistance and pressure drop in the piping system to each injection point is necessary to: (1) prevent total pump flow from exceeding runout conditions when the system is in its minimum resistance configuration, (2) provide the proper flow split between injection points in accordance with the assumptions used in the ECCS-LOCA analyses, and (3) provide an acceptable level of total ECCS flow to all injection points equal to or above that assumed in the ECCS-LOCA analyses.

is fullSurveillance of water. Requirement 4.5.2.b.1 requires verifying that the ECCS piping The ECCS pumps are normally in a standby, nono with the exception of the operating centrifugal charging pump (s).perating mode, As such, the ECCS gases. flow path piping has the potential to develop voids and pockets of entrained Maintaining the piping from the ECCS pumps to the RCS' full of water ensures RCS.

that the system will perform properly when required _ to inject into the This will' also prevent water hammer, pump cavitation, and pumping of noncondensible gases (e.g., air, nitrogen, or hydrogen) into the reactor vessel following an SI signal or during shutdown cooling.

This Surveillance Requirement is met by:

venting ECCS pump casings and the accessible discharge piping high points including the ECCS pump suction crossover piping (i.e., downstream of l valves 3RSS*MV8837B and 3RSS*MV8838A/B to safety injection and charging pump suction).

venting of the nonoperating centrifugal charging pumps at the suction line test connection. The nonoperating centrifugal charging pumps do not have casing vent connections and venting the suction pipe will assure that the pump casing does not contain voids and pockets of entrained gases.

using an external water level detection method for the water filled portions of the RSS piping upstream of valves 3RSS*MV8837A/B and ,

3RSS*MV8838A/B. When deemed necessary by an external water level detection method, filling and venting to reestablish the acceptable water levels may l

be performed after entering LCO action statement 3.6.2.2 since venting without isolation of the affected train would result in a breach of the containment pressure boundary, i

The following ECCS subsections are exempt from this Surveillance:

the operating centrifugal charging pump (s) and associated piping - as an operating pump is self venting and cannot develop voids and pockets of entrained gases.

HILLSTONE - UNIT.3 8 3/4 5-2 Amendment No. Jpp. J ocu RevisedbyNRCletterdatedy/lgY