ML19283B753

Forwards Final Proposed Version for Tech Spec Changes Re Spare Battery Installation.Proposed Change Is Required Prior to Scheduled Testing Date of 790701

ML19283B753
Person / Time
Site:	Calvert Cliffs
Issue date:	03/12/1979
From:	Ash R BALTIMORE GAS & ELECTRIC CO.
To:	Reid R Office of Nuclear Reactor Regulation
References
NUDOCS 7903140440
Download: ML19283B753 (8)

Text

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/%B ALTIMORE GAS AND ELECTRIC CHARLES CENTER . P.O. BOX 1475 BALTIMORE, MARYLAND 21203 ELECTRIC ENGINEERING March 12, 1979 oEPARTMENT Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission "ashington, D. C. 20555 Attn: Mr. Robert W. Reid, Chief Operating Reactors Branch #h Division of Operating Reactors

Subject:

Calvert Cliffs Nuclear Power Plant Unit No. 1 & 2, Docket No. 50-317 & 50-318 Snare Batterv Installaticn

Reference:

(a) BG&E letter dated 6/17/77 from Lundvall to Case, Request for Amendments.

(b) NRC Meeting Minutes dated 9/15/77, Battery Capacity Testing.

Gentlemen:

Reference (a) requested several changes to the Calvert Cliffs Units Nos. 1 and 2 Technical Specifications. Among these was a request to allow capacity testing of the station batteries without requiring the shutdown of the reactors. Reference (b) summarized a meeting held on August 31, 1977 to discuss the proposed change and also summarized several alternativer which the NRC Staff felt would be acceptable in lieu of our proposal. Since that meeting we have been proceeding with the alternative that the Staff felt was the most acceptable, that is, the procurement and installation of a spare, fully qualified battery.

In a meeting with the NRC Staff on December 6,1978, we reported on the status of that effort and discussed the information which the NRC vould require to allow them to review and evaluate the proposed installation.

During that meeting, the Staff provided us with a modified version of our June 17, 1977 proposed technical specification to reflect the new battery alternative. We have reviewed that version and have included our final proposed version as Attachment 1 to this letter.

In a telephone conversation during the latter half of last month, we informed the Staff that we would not complete the final instal-lation of the new battery in time to allow us to cenduct the required

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. Page 2 surveillance on the existing batteries within the Technical Specification limits. Recalling the acceptable alternatives outlined by the NRC Staff in our August 31, 1977 meeting, we proposed an interim temporary instal-lation of the spare battery to allow us to conduct the required discharge capacity tests on the existing batteries. We vere informed by the NRC Staff on March 6, 1979 that it is acceptable to conduct the tests using the temporary installation. Attachment 2 provides a description of our plans to accomplish this task.

We wish to emphasize that the proposed technical specification change is still required prior to the scheduled testing date, July 1,1979 Unless it is requested by the NRC Staff, we do not intend to submit any follow-up vritten correspondence concerning the temporary battery inctallation cr the associated discharge capacity tests. However, we vill keep our NRC Project Manager informed of our progress and, of course, the installation and testing vill be available for inspection by the NRC I&E inspector. As discussed in the 12/6/78 meeting, we do intent to provide the NRC S+aff with the details of the permanent battery instal-lation design when asailable.

Ve,ry[truly yours,

[] I R. F. Ash Chief Nuclear Engineer RFA/smn Enclosure cc - J. A. Biddison, Esquire G. F. Trowbridge, Esquire Mr. E. L. Conner , Jr. - NRC

ArrAcameri (2 sneers)

ELECTRICAL POWER SYSTEMS D.C. DISTRIBUTION - OPERATING LIMITING CONDITION FOR OPERATION 3.8.2.3 The following D.C. bus trains shall be energized and OPERABLE:

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a. 125-volt D.C. bus No.11,g125 volt D. C. battery bank ?!;.11-and a full capacity charger.

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b. 125-volt D.C. bus No.12, Al25-volt D. C. battery bank ;;c. 12 and a full capacity charger. l CL.

c. 125-volt D.C. bus No. 21,A125-volt D. C. battery bank i'c. '"

and a 'ull capacity charger. l GL

d. 125-volt D.C. bus No. 22,4125-volt D. C. battery bank !:;. 22 and a full capacity charger. l APPLICABILITY: MODES 1, 2, 3 and 4.

ACTION:

a. With one 125-volt D.C. bus inoperable, restore the inoperable bus to 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 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 />.

b. With one 125'-volt D.C. battery and/or its charger inoperable, I except during surveillance testing per Specifications 4.8.2.3.2.c.2, 4.8.2.3.2.d and 4.8.2.3.2.e, restore the inoperable battery and/or charger to 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 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 />, a ud.

c. With one 125-volt D.C. battery inoperable during surveill nce testing of the battery per Specifications 4.8.2.3.2.c.2 4.8.2.3.2.d;l M ".S.2.3.2.:. operation may continue provided the associated {

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is being powered (2 f-vat 3.c. 6,tferby an rad OPERABLE dc wecharger.denet% N.

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SURVEILLANCE RE0VIREMENTS a m bus a h4% Ccwmd by a 125-vdf.h.c. bstte<yba.1 h A x 0/d W R E c.,w g e n 4.8.2.3.1 Each D.C. bus train shall be determined OPERABLE and energized at least once per 7 days by verifying correct breaker alignment and indicated power availability.

4.8.2.3.2 Each 125-volt battery bank and charger shall be demonstrated OPERABLE:

CALVERT CLIFFS-UNIT 1 3/4 8-8 AmendmentNo.K

ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

. a. At least once per 7 days by verifying that:

1. The electrolyte level of each pilot cell is between the minimum and maximum level indication marks.

2. The pilot cell specific gravity, corrected to 77 F and full electrolyte level, is 1 1.200.

3. The pilot cell voltage is 1 2.10 volts.

4. The overall battery voltage is 1 125 volts.

b. At least once per 92 days by verifying that:

1. The voltage of each connected cell is 1 2.10 volts under float charge and has not decreased more than 0.10 volts from the value observed during the original acceptance test.

2. The specific gravity, corrected to 77 F and full elec-trolyte level, of each connected cell is 1 1.200 and has

'not decreased more than 0.02 from the value observed during the previous test.

3. The electrolyte level of each connected cell is between the minimum and maximum level indication marks.

c. At least once per 18 months by verifying that:

1. The cells, cell plates and battery racks show no visual indication of physical damage or deterioration.

2. The cell-to-cell and terminal connections are clean, tight, and coated with anti-corrosion material.

d. At least once per 18 months by, verifying that the battery capacity, with the charger disconnected, adequate to either:

1. Supply and maintain in OPERABLE status all of the actual emergency loads for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> when the battery is subjected to a battery service test, or 43 .

CALVERT CLIFFS-UNIT 1 3/4 8-9 '#

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2 ELECTRICAL POWER SYSTEMS SURVEILLANCE REQUIREMENTS (Continued)

2. Supply a dummy load of the following profile for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> while maintaining the battery terminal voltage > 100 volts: ,

a) Batteries 11 and 21:

First minute > 827 amperes Next 1 minute > 461 amperes Next 117 minutes > 251 amperes Next I minute > 3'f5 amperes

( b) Batteries 12 and 22:

First minute .>_193 amperes Next 119 minutes > 160 amperes At the completion of this battery test, the battery charger shall be demonstrated capable of recharging the battery at a rate of < 400 amperes while supplying nomal D.C. loads. The battery shall be charged to at least 95% capacity in < 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />.

e. At least once per 60 months. duria: -"rtfr , by verifying that the hattery capacity is at least 80% of the manufacturer's rating when subjected to a performance discharge test. This performance discharge test shal.1 be performed subsequent to the satisfactory completion of the required battery service test.

CALVERT CLIFFS-UNIT 1 3/4 8-10 FE9 1 1 1377

A"'rACHIE'T 2 In order to test the existing safety-related 125 VDC control batteries at Calvert Cliffs Nuclear Power Plant (CCNPP), a reserve 125 VOC battery cysten vill be installed as a fully qualified, safety-related, back-up battery system.

The system basically includes a 1500 Ahr. fully qualified battery, a 1200 ampere transfer switch and 1200 ampere discone. set switches. (See Figure 1) The charger and its associated disconnect switches are non-safety related since they vill never be electrically connected to the safety-related systems. The spare battery is on a continuous float charge until which time it is transferred from the charger to the load.

The existing 125 VDC batteries at CCNPP are rated 1350 Ahr. The new battery, rated at 1500 Ahr. vill be full cspacity discharged in th- same manner the original batteries were cualified. The battery is then recharged and readied for the capacity discharge tests on the existing batteries.

The new system vill be installed such that no permanent connections vill be made to the existing 125 VDC buses. This vill guarantee no crons-connections between the different facilities. At the time of the tests, cables vill be connected between the l'2 00 ampere disconnect switch and the bus of which battery is to be tested. The other advantage of this temporary connection is that separation criteria vill not be compromised. Any one problem (fire, fault, etc. ) would not vielste our single failure criteria.

All switching equipment is to be located in the cable spreading room, Elevation 27, where the existing D.C. switchgear is located. The battery will be permanently located in the Log and Instrumentation Room, Elevation h5 This room sits directly over the cable spreading room which vill allow the shortest possible cable run in conduit to the switching equipment. The battery vill be enclosed with three (3) hour fire-rated valls including ventilation,and fire and flow detectors.

Due to the length of time necessary for the construction of the battery room and to the availability of the location, the battery room vill not be completed in time for the capacity discharge tests of the existing 125 VDC batteries. There-fore, ve are proposing to locate the new battery temporarily on the turbine deck, Elevation h5, directly outside of the future, permanent location (See vicure 2).

The battery vill be sitting on 1/2 inch thick plywood and 1/h inch thick rubber mat directly en the turbine deck, and vill be enclosed by a temporary barrier. The temporary cables from the battery to its 1200 ampere disconnect switch vill be protected from personnel by supporting them above a drop ceiling until they drop into the permanent conduit. All other switching equipment vill be permanently instal-led by July 1, 1979 The battery vill be under constant surveillance during the tests, which vill take 2h hours for each of the four batteries or approximately four days. These tests have been scheduled to begin July 1,1979 Once the tests are complete, all tenporary cables vill be removed. When the battery is relocated in its Der =anent location, it vill be recualified and readied for any future use.

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