ML20210V577

Safety Evaluation Supporting Amends 123 & 105 to Licenses DPR-53 & DPR-69,respectively

ML20210V577
Person / Time
Site:	Calvert Cliffs
Issue date:	10/06/1986
From:	Thadani A Office of Nuclear Reactor Regulation
To:
Shared Package
ML20210V413	List: ML20210V408 ML20210V577
References
NUDOCS 8610100736
Download: ML20210V577 (7)

Text

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f UNITED STATES y

g NUCLEAR REGULATORY COMMISSION r,

[

WASHINGTON, D. C. 20555

_ SAFETY EVALUATION BY THE OFFICE OF NUCLEAR REACTOR REGULATION RELATED TO AMENDMENT NOS.123 AND 105 TO FACILITY OPERATING LICENSE NOS. DPR-53 AND DPR-69 BALTIMORE GAS AND ELECTRIC COMPANY CALVERT CLIFFS NUCLEAR POWER PLANT, UNIT NOS. 1 AND 2 DOCKET N05. 50-317 AND 50-318 Introduction By letters dated April 14, 1986 (Reference 1) and July 24, 1986 (Reference 2),

Baltimore Gas and Electric Co. (BG&E) requested a modification of the Technical Specifications for Calvert Cliffs Units 1 and 2.

The modification would add the following limiting condition for operation in Section 3/4.8.1 of the Technical Specifications as subsection f.

"f.

With one Diesel Fuel Oil Storage Tank inoperable, demonstrate the OPERABILITY of the remaining tank by:

1) perfonning Surveillance Requirement 4.8.1.1.2.a.2 (verifying 36,500 gallons) within one hour and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter, and 2) verifying the flowpath from the OPERABLE fuel oil storage tank to the diesel generators within one hour. Restore two storage tanks to OPERABLE status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> or be in at least HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

(NOTE:

If the tank is inoperable, maintain an 8,000 gallon alternate fuel source onsite.)

This Action Statement is not applicable for the following conditions:

1) when iP21 Diesel Fuel Oil Storage Tank is inoperable during the period from April I through September 30 due to the higher probability of tornado occurrences during this timeframe, r

and 2) when two Diesel Fuel Oil Storage Tanks are inoperable.

Action statement 'e' is applicable in this condition."

This modification also proposed some minor rewording of LC0 in Section 3.8.1.1.b for clarification purposes only.

Minor changes were made to the submittals for the purpose of clarification with the consent of the BG&E staff.

In the Note for Action Statement "f", the l

aojective " inoperable" replaced the originally proposed modifier " drained" l

and the word " parked" was removed from the original phrase " maintain an 8,000 gallon alternate fuel source parked onsite". Additionally, the phrase "2) when two Diesel fuel Oil Storage Tanks are inoperable" was added to the explanation of when Action Statement "f"

is not applicable. Previously, this stipulation was implied but not stated.

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-. Background Calvert Cliffs Units 1 and 2 Technical Specifications require the operability of two separate and independent diesel generators with a common fuel storage system consisting of two independent storage tanks each containing a minimum volume of 18,250 gallons of fuel. This requirement causes both diesel generators to be considered inoperable if only one diesel fuel oil storage tank is found inoperehle.

In this condition, the Technical Specification requirement is to either return both fuel oil storage tanks to an operable status within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />, or be in HOT STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br />. This makes any repair, which requires the tank to be drained, impossible without i

first shutting down both Units 1 and 2.

Incorporation of the proposed 72-hour action statement will allow necessary repairs to the fuel oil storage tanks during unit operation. A similar change of the Technical Specification requirement for a period of 14 days during April /May of 1984 was granted to BG8E by our SER dated March 29, 1984 (Reference 3).

Evaluation At the Calvert Cliffs nuclear power plant, a swing diesel generator is used for the required redundant Standby AC power source for both units.

Each unit has one dedicated ciesel generator with a design provision to manually connect the swing diesel generator to redundant buses in Unit 1 or Unit 2.

The fuel storage system for these three diesel generators consists of two redundant j

and independent outdoor fuel storage tanks (DFOST #21 and 11) each with a y

usable capacity of 109,500 gallons and normally containing a minimum volume of 18,250 gallons of fuel. Redundant fuel supply headers interconnect the two tanks. Manually operated valves are provided such that each tank normally l

supplies a different header. Each of the three diesel engines can get their 3

fuel supply from either of the two storage tanks through the redundant headers.

Each diesel generator is equipped with a 485 gallon day tank containing a minimum of 375 gallons of fuel. Transfer of fuel oil from the storage tank j

to the day tank is accomplished by a 10 gpm rated fuel transfer pump, one for each diesel generator. At full load, the day tank allows approximately 2-1/2 hours of operation before the transfer of fuel oil is necessary.

Although both storage tanks and associated piping are designed to Seismic Category I requirements, only DFOST #21 is provided with protection against tornado winds and tornado generated missiles. As such, the operability of DFOST #11

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which is not protected against tornado winds and tornado generated missiles, cannot be assured during the proposed 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> LC0 when DFOST #21 is out for repair.

In response to the staff's concern, the licensee proposed that the 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> LC0 action statement shall not be applicable if DFOST #21 is out of i

service during the period of April 1st through September 30. This is based on j

high probability of a tornado occurring during the months of April through September. lhe licensee's submittal indicates that there were 63 tornadoes within a period of 36 years (1950 thru 1985) which occurred in an area 50 miles in radius around the Calvert Cliffs Nuclear Power Plant site.

Fifty-three out of the sixty-three tornadoes were recorded during the months of April through l

September establishing a higher probability of tornadoes during this period of l

the year.

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. The proposed Technical Specification change retains the existing action statement when DFOST #21 is out of service for repair (action statement "e" when both required diesel generators are inoperable) during the period of April through September. During the remaining 6 months when any one of the two DFOSTs is inoperable or any time during the year when DFOST #11 is out of service, the proposed Technical Specification will require demonstration of the operability of the remaining tank by:

1.

Verifying fuel level of at least 36,500 gallens within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> thereafter, and 2.

Verifying the flow path from the operable storage tank to the diesel generators within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />.

If two DF0STs are not restored to an operable status within 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />, both units should be in H0T STANDBY within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in COLD SHUTDOWN within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

The proposed surveillance program ensures the availability of at least 36,500 gallons of fuel in the operable fuel tank which is the minimum requirement of fuel for operation and ensures the passage of fuel oil from the operating storage tank to each diesel generator. Restrictin missile protected storage tank (DFOST #21)g the inoperability of the tornado during the tornado season (April through September) ensures that the units are shutdown without delay when the DF0ST #11 which is not protected from tornado wind and tornado generated missile is the only storage tank operating to supply fuel to the diesel generators.

We, therefore, find this Technical Specification change to be acceptable.

State Consultations The State of Maryland was consulted on this matter and had no comments on the determination.

Environmental Consideration The NRC staff has evaluated the environmental consequences of permitting continued power operation of up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> with one Diesel Fuel Oil Storage Tank inoperable. An environmental Assessment and Finding of No Signiflcant Impact, associated with this action, was published in the Federal Register on September 12, 1986 (51 FR 32558).

Conclusion We have concluded, based on the considerations discussed above, that (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, and (2) such activities will be conducted in compliance with the Commission's regulations, and the issuance of the amendments will not be inimical to the common defense and security or to the health and safety of the public.

- References 1.

BG&E letter (J. Tiernan) to NRC (A.C. Thadant) dated April 14, 1986.

2.

BG&E letter (L.E. Salyards) to NRC (A.C. Thadani) dated July 24, 1986.

3.

NRC memorandum (L.S. Rubenstein) to (Gus C. Lainas) dated March 29, 1984.

Date: October 6,1986 Principal Contributor:

1. Ahmed r

7590-01 s

UNITED STATES NUCLEAR REGULATORY COMMISSION BALTIM0RE GAS AND ELECTRIC COMPANY DOCKET N05. 50-317 AND 50-318 NOTICE OF ISSUANCE OF AMENDMENTS TO FACILITY OPERATING LICENSES The U.S. Nuclear Regulatory Commission (the Commission) has issued Amendment Nos.123 and105 to Facility Operating Licenses Nos. DPR-53 and DPR-69, issued to the Baltimore Gas and. Electric Company (the licensee), which revised the Technical Specifications for operation of the Calvert Cliffs Nuclear Power Plant, Unit Nos. I and 2 (the facility), located in Calvert County, Maryland. The amendments were effective as of the date of their issuance.

b The amendments change the Technical Specification (TS) 3/4.8.1 as follows:

(1) TS 3.8.1.1.b limiting condition for operation is modified to reflect that

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an individual day fuel tank and separate fuel transfer pump is required for each diesel generator and that the two diesel generators share a cannon fuel storages;ystemconsistingoftwoindependentstoragetanksand,(2)TS 3.8.1.1 will incorporate a new Action Statement "f" that will permit continued operation of up to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> with one Diesel Fuel Oil Storage Tank inoperable and requires an alternate 8000 gallon fuel supply onsite during this period.

Action Statement "f" is not applicable to an inoperable #21 Diesel Fuel Oil Storage Tank from April I through September 30 nor is it applicable for two inoperable Diesel Fuel Oil Storage Tanks. Action Statement "e" is applicable for these cot.Jitions.

The application for the amendments complies with the standards and requirements of the Atomic Energy Act of 1954, as amended (the Act), and the Commission's rules and regulations. The Commission has made appropriate findings as required by the Act and the Commission's rules and regulations in 10 CFR Chapter I, which are set forth in the license amendments.

Notice of Consideration of Issuance of Amendments and Opportunity for Prior Hearing in connection with this action was published in the FEDERAL REGISTER on May 20, 1986 (51 FR 18519). No request for a hearing or petition for leave to intervene was filed following this notice.

The Commission has prepared an Environmental Assessment and Finding of No Significant Impact related to the action and has concluded that an environmental impact statement is. not warranted because there will be no environmental impact attributable to the action significantly beyond that which has been predicted and described in the Commission's Final Environmental

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Statement for the facility dated April 1973.

For further details with respect to the action see (1) the application for amendments dated April 14, 1986 as supplemented July 24, 1986, (2) Amendment Nos.123and 105to Facility Operating License Nos. DPR-53 and i

DPR-69, (3) the Commission's related Safety Evaluation dated and (4) the Environmental Assessment dated September 8, 1986. All of these items are available for public inspection at the Commission's Public Document Room, 1717 H Street, N.W., Washington, D.C., and at the Calvert County Library, Prince Frederick, Maryland. A copy of items (2), (3) and (4) may be I

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obtained upon request addressed to the U.S. Nuclear Regulatory Commission, Washington, D.C.

20555, Attention: Director, Division of PWR Licensing-B.

Dated at Bethesda, Maryland, this 6th day of October,1986.

FOR THE NUCLEAR REGULATORY COMMISSION Ashok. Thadani, Director PWR Project Directorate #8 Division of PWR Licensing-B t

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