ML20217K189
| ML20217K189 | |
| Person / Time | |
|---|---|
| Site: | Millstone  |
| Issue date: | 04/01/1998 |
| From: | Andersen J NRC (Affiliation Not Assigned) |
| To: | Bowling M NORTHEAST NUCLEAR ENERGY CO. |
| References | |
| TAC-MA1221, NUDOCS 9804070148 | |
| Download: ML20217K189 (5) | |
Text
l Mr Mirtin L ' Bowling, Jr.
April 1, 1998 R:cov:ry Officer-Millstona
- Unit No. 2
. Northeast Nuclear Ener9y Company ;
clo Ms. Patricia A. Loftus Director-Regulatory Affairs.
P. O. Box 128 Waterford, CT 06385
SUBJECT:
MILLSTONE NUCLEAR POWER STATION, UNIT NO. 3 - CHANGE TO TECHNICAL SPE.CIFICATION BASES SECTION 3/4.4.9 (TAC NO. MA1221)
Dear Mr. Bowling:
By letter dated March 9,1998, Northeast Nuclear Energy Company (the licensee) submitted a' 1
change to Technical Specification (TS) Bases Section 3/4.4.9, " Pressure / Temperature Limits."
The change removes one of the examples used in the Bases as a means of providing cold overpressure protection.
In its March 9,1998; letter, the licensee stated that'TS 3.4.9.3 specifies in Action "e" that a reactor coolant system vent of greater than or equal to 5.4 square inches can be used as a means of providing cold overpressure protection. Bases Section 3/4.4.9 provides examples of.
1 methods to provide greater than or equal to 5.4 square inches. One of the listed methods was removing a power operated relief valve and disabling its block valve in the open position.
However, during the current outage, the licensee has replaced the block valves and the new valve design does not provide a vent area of greater than or equal to 5.4 square inches.
The Millstone Unit 3 Plant Operating Review Committee approved the revision to BasesSection I
3/4.4.9 on January 20,1998. The NRC staff has reviewed the change and has no objection to
. the wording. A copy of revised TS Bases page B 3/4 4-17 is enclosed.
Sincerely,l' signed by:
Origina James W. Andersen, Project Manager Special Projects Office - Licensing -
Office of Nuclear Reactor Regulation Docket No. 50-423 lh
Enclosure:
Revised TS Bases page B 3/4 4-17 cc w/ encl:' See next page DISTRIBUTION:
MMei)-
WBeckner PUBLIC SSheng
.1 SPO-L Reading CLlang
[.
SPO Reading.
ACRS WTravers JDurr, RI PMcKee LBorry JAndersen i (2)
. s.O O '
hh DOCUMENT NAME: G:\\ANDERSEN\\a1221.wpd To receive a copy of this document, mdicate in the box: "C" = Copy without attachment / enclosure ~ "E" = Copy with -
Ettachment/enclosuref "N" = No copy 4(as
/\\/
OFFICE SPO-L Phi SPO-L:LA0 h U SRXB M
SP6LIJD
~NAME JAnderd LBerry -
YA/
TCo//,e 1E P \\$:l'ee l
DATE 036/98I 03/( /98 ~ J 03/g98
~
Ol/ /98 03/ /98 9804'07014e 980401 PDR ADOCK 05000423 P
l e* %g't UNITED STATES p
g j
NUCLEAR REGULATORY COMMISSION
,% *****,/y WASHINGTON, D.C. 20066-0001 April 1, 1998 Mr. Martin L Bowling, Jr.
Recovery Officer-Millstone Unit No. 2 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 NO. 3 - CHANGE TO TECHNICAL SPECIFICATION BASES SECTION 3/4.4.9 (TAC NO. MA1221)
Dear Mr. Bowling:
By letter dated March 9,1998, Northeast Nuclear Energy Company (the licensee) submitted a change to Technical Specification (TS) Bases Section 3/4.4.9, " Pressure / Temperature Limits."
The change removtss one of the examples used in the Bases as a means of providing cold overpressure protection.
In its March 9,1998, letter, the licensee stated that TS 3.4.9.3 specifies in Action "e" that a reactor coolant system vent of greater than or equal to 5.4 square inches can be used as a 4
means of providing cold overpressure protection. Bases Section 3/4.4.9 provides examples of methods to provide greater than or equal to 5.4 square inches. One of the listed methods was removing a power operated relief valve and disabling its block valve in the open position.
However, during the current outage, the licensee has replaced the block valves and the new valve design does not provide a vent area of greater than or equal to 5.4 square inches.
The Millstone Unit 3 Plant Operating Review Committee approved the revision to Bases Section 3/4.4.9 on January 20,1998. The NRC staff has reviewed the change and has no objection to the wording. A copy of revised TS Bases page B 3/4 4-17 is enclosed.
Sincerely, m 3 W. Andersen, Project Manager pecial Projects Office - Licensing Office of Nuclear Reactor Regulation Docket No. 50-423
Enclosure:
Revisad TS Bases page B 3/4 4-17 cc w/ encl:
See next page
a w
e REACTOR C00LANT SYSTEN 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 analyzed isothermal events.
When a PORV is ' opened, the release 'of coolant will cause the' pressure increase j
to slow and reverse. As the PORV releases coolant, the RCS pressure decreases l
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 Reauirements j
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 I
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 Raouirements Once the RCS is 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 similarly l
- Pressurizer safety valve, removing a Pressurizer manway, or 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.
NILLSTONE - UNIT 3 8 3/4 4-17 Amendment No. 177, Revised by NRC Letter dated
Northrst Nuclear Energy Company Millston3 Nucirr Power St:ti:n Unit 3 cc:
e 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 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, DC 20037 Regional Administrator, Region i Mr. F. C. Rothen i
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 First Selectmen Town of Waterford Emest C. Hadley, Esquire Hall of Records 1040 B Main Street 200 Boston Post Road P.O. Box 54g 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 Mr. M. H. Brothers Mr. James S. Robinson, Manager Vice President - Operations Nuclear Investments and Administration Northeast Nuclear Energy Company New England Power Company P.O. Box 128 25 Research Drive Waterford, CT 06385 Westborough, MA 01582 Mr. M. R. Scully, Executive Director Mr. D. M. Goebel Connecticut Municipal Electric Vice President - Nuclear Oversight Energy Cooperative Northeast Utilities Service Company 30 Stott Avenue P. O. Box 128 Norwich, CT 06360 Waterford, CT 06385 Mr. David Amerine Deborah Katz, President Vice President - Nuclear Engineering Citizens Awareness Network and Support P.O. Box 83 i
Northeast Utilities Service Company Shelbume Falls, MA 03170 P. O. Box 128 Waterford, CT 06385
Northeast Nucle:r En:rgy Company Millstona Nucl:ar Power Station Unit 3 cc:
Mr. Allan Johanson, Assistant Director Mr. Don Schopfer Office of Policy and Management Verification Team Manager Policy Development and Planning Sargent & Lundy Division 55 E. Monroe Street 450 Capitol Avenue - MS# 52ERN Chicago,IL 60603 P. O. Box 341441 Hartford, CT 08134-1441 Mr. J. P. McElwein Vice President (Acting)- Millstone 3 Citizens Regulatory Commission Northeast Nuclear Energy Company ATTN: Ms. Susan Perry Luxton P.O. Box 128 180 Great Neck Road Waterford, CT 06385
-Watosford, 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 Legislative Office Building clo U.S. Nuclear Regulatory Commission Captiol Avenue P. O. Box 513 Hartford, CT 06106 Niantic, Connecticut 03357 Mr. Evan W. Woollacott Co-Chair Nuclear Energy Advisory Council 128 Terry's Plain Road Simsbury, CT 06070
)
Little Harbor Consultants, Inc.
Millstone -ITPOP Project Office 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 Reading, PA 19607 1
..b