ML20199F629

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Amend 153 to License NPF-49,modifying Requirements for Determining Operability of Lower Voltage Circuit Breakers by Using Manufacturers Curve of Current Vs Time to Test Delay Trip Elements
ML20199F629
Person / Time
Site: Millstone Dominion icon.png
Issue date: 11/14/1997
From: Mckee P
NRC (Affiliation Not Assigned)
To:
Shared Package
ML20199F633 List:
References
NUDOCS 9711240280
Download: ML20199F629 (5)


Text

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p-UNITED STATES 5

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NUCLEAR REGULATORY COMMISSION o,

WASHINGTON, D.C. 3064H001 NORTHEAST NUCLEAR ENERGY COMPANY. ET AL.

DOCKET NO. 50-471 MILLSTONE NUCLEAR POWER STATION 'gnl' NO. 3 AMENDMENT TO FACILITY OPERATINLj,JJX51 Amendment No. 153 Licente No. NPF-49 1.

The Nuclear Regulatory Comission (the Comission) has found that:

A.

The application for amendment by Northeast Nuclear Energy Company, et al. (the licenseo dated May 5,1997, complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Comission's rules and regulations set l

forth in 10 CFR Chapter I; l

B.

The facility will operate in conformity with the application, the provisions of the Act, and the rules and regulations of the Comission; C.

There is reasonable assurance (1) that the activities authorized by this amendment can be conducted without endangering the health l

and safety of the public, and (ii) that such activities will be l

conducted in compliance with the Comission's regulations; l

D.

The issuance of this amendment will not ve inimical to the common defense and security or to the health and safety of the public; and i

E.

The issuance of this amendment is in accordance with 10 CFR l

Part 51 of the Comission's regulations and all applicable l

requirements have been satisfied.

l 9711240200 971114 PDR ADOCK 05000423 P

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. 2.

Accordingly, the license is amended by changes to the Technical Specifications as indicated in the attachment to this license amendment, and paragraph 2.C.(2) of Facility Operating License No. NPF-49 is hereby amended to read as follows:

(2)

Technical Soecifications The Technical Specifications contained in Appendix A, as revised through Amendment No.153, and the Environmental Protection Plan contained in Appendix B, both of which are attached hereto are hereby incorporated in the license. The licensee shall operate the facility in accordance with the Technical Specifications and the Environmental Protection Plan.

3.

This license emendment is effective as of the date of its issuance, to be implemented within 60 days of issuance.

FOR THE NUCLEAR REGULATORY COMMISSION f

Phillip F. McKee Deputy Director for Licensing Special Projects Office Office of Nuclear Reactor Regulation

Attachment:

Changes to the Technical Specifications Date of Issuance:

Novenber 14, 1997 I

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- ATTACHMENT TO LICENSE AMENDMENT NO.153 FACILITY OPERATING l.lCENSE NO. NPF-49.

DOCKET NO. 50-423 Replace the following ) ages of the Appendix A, Technical Specifications, t/ith the attached pages.

T1e revised pages are identified by amendment number and contain vertical lines indicating the areas of change.

Remove Insert 3/4 8-20 3/4 8-20 B 3/4 8-3 8 3/4 8-3 l

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.: ELECTRICAL POWER SYSTEMS

-SURVEILLANCE REQUIRENDITS (Continued) c)

For each circuit breaker found inoperable during these functional tests, an additional representative sample of et least 10% of all the circuit breakers of the inoperable type shall also be functionally tested until no more failures are found or all circuit breakers of that-type have been functionally tested.

2)

By selecting and functionally testing a representative san >1e of at least 10% of each type of lower voltage circuit breacars.

Circuit breakers selected for functional testing shall be selected on a rotating basis.

Air circuit breaker long-time and short-time delay trip elements shall be tested to verify that the circuit breaker operates within the manufacturer's time delay band width for the specified test current. The instantaneous element shall be tested by injecting a current equal to i 20% of the pickup value of the element and verifying that the circuit breaker trips instantaneously with no intentional time delay.

Molded case circuit breakers and unitized starters (a frame size of 250 amas or less) shall be tested for long time delay as described a>ove, and in addition tested for the l

instantaneous trip by injecting a current value which falls within +40% (of the upper limit) and -25% (of the lower limit) of the manufacturers instantaneous trip current range and varifying the breaker trips instantaneously with no intentional time delay. For those molded case circuit breakers / unitized starters used in 480V ungrounded circuits, if single pole l

instantaneous test results fall outside these tolerances, additional instantaneous testing shall be conducted to determine the breaker's operability using two poles in series, including A-B, B-C and C-A phase combinations.

If test results of all two poles in series combinations fall within the specified tolerances, the breaker is considered OPERABLE.

Circuit breakers found inoperable during functional testing shall be restored to OPERABLE status prior to resuming operation. For each circuit breaker found inoperable durfag these functional tests, an additional representative : ample of at least 10% of all the circuit breakers of the inoperable type shall also be functionally tested until no more failures are found or all circuit breakers of that type have been func-tionally tested, b.

At least once per 60 months by subjecting each circuit breaker to an inspection and preventive maintenance in accordance with procedures prepared in conjunction with its manufacturer's recommendations, gIgLSTONE-1811T3 3/48-20 Amendment No. J7, pp, 153

ELECTRICAL POWER SYSTEMS nAsEs 3/4.8.4 ELECTRICAL E0UIPMENT PROTECTIVE DEVICES Containment electrical penetrations and penetration conductors are pro-tected by either deenergizing circuits not required during reactor operation or by demonstrating the OPERABILITY of primary and backup overcurrent protec-tion circuit breakers during periodic surveillance.

The Surveillance Requirements applicable to lower voltage circuit breakers provide assurance of breaker reliability by testing at least one representative sample of each manufacturer's brand of circuit breaker.

Each manufacturer's molded case and metal case circuit brukers are grouped into representative samples which are then tested on a rotating basis to ensure that all breakers are tested.

If a wide variety exists within any manufacturer's brand of circuit breakers, it is necessary to divide that manufacturer's breakers into groups and treat each group as a separate type of breaker for surveillance purposes.-

Long-time trip elements are tested by injecting a test current (300% of the pickup) in accordance with the manufacturer's specifications and verifying that the circuit breaker operates within the time delay band width for that current as specified by the manufacturer.

Short-time trip elements are tested by injecting a test current (150% of the pickup) in accordance with the manufacturer's specifications and verifying that the circuit breaker operates within the time delay band width for that current as specified by the manufacturer.

The molded case circuit breakers and unitized starters will be tested in accordance with Manufacturer's Instructions.

The OPERABILITY of the motor-operated valves thennal overload protection and integral bypass devices ensures that the thermal overload protection will not prevent safety-related valves from performing their function. The Surveil-lance Requirements for demonstrating the OPERABILITY of the thermal overload protection are in accordance with Regulatory Guide 1.106

" Thermal Overload Prntection for Electric Motors on Motor Operated Valves," Revision 1, March 197/.

Operating Procedure

3273,

" Technical Requirements Supplementary Technical Specifications," list containment penetration conductor overcurrent protective devices and thermal overload protection bypassed only under accident conditions and thermal overload protection not bypassed under accfdent conditions.

The addition or deletion of any device shall be made in accordance with Section 50.59 of 10CFR50 and approved by the Plant Operation Review Committee.

MILLSTONE - IINIT 3 8 3/4 8-3 Amendment No. 77, 77, 153 0617

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