Text

License Amendment Request 03-11, Revision to Technical Specifications Associated with DC Electrical Power Systems
	ML032110190
Person / Time
Site:	Diablo Canyon
Issue date:	07/24/2003
From:	Oatley D; Pacific Gas & Electric Co
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	DCL-03-084
	Download: ML032110190 (119)
	v • d • e

El Pacific Gas and 3 Electric company David H.Oatley Diablo Canyon Power Plant Vice President and PO. Box 56 General Manager Avila Beach, CA 93424 July 24, 2003 805.545.4350 Fax: 805.545.4234 PG&E Letter DCL-03-084 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Docket No. 50-275, OL-DPR-80 Docket No. 50-323, OL-DPR-82 Diablo Canyon Units 1 and 2 License Amendment Request 03-11 Revision to Technical Specifications Associated with DC Electrical Power Systems

Dear Commissioners and Staff:

In accordance with 10 CFR 50.90, enclosed is an application for amendment to Facility Operating License Nos. DPR-80 and DPR-82 for Units 1 and 2 of the Diablo Canyon Power Plant (DCPP) respectively. This License Amendment Request (LAR) proposes changes to Technical Specification (TS) Section 3.8.4, "DC Sources -

Operating," TS Section 3.8.5, "DC Sources - Shutdown," and TS Section 3.8.6, "Battery Cell Parameters," and adds a new TS Section 5.0, uAdministrative Controls," program for the maintenance and monitoring of the station safety-related batteries that is based on the recommendations of Institute of Electrical and Electronics Engineers (IEEE) Standard 450-1995. Upon approval, corresponding changes will be made to the associated TS Bases sections and are included here for information.

Except where modified to account for plant-specific differences, the changes proposed in this amendment request are in accordance with those provided in NRC approved Industry/Technical Specifications Task Force (TSTF) Standard Technical Specification Change Traveler, TSTF-360, Revision 1, "DC Electrical Rewrite," and incorporated in NUREG-1431, "Standard Technical Specifications, Westinghouse Plants," Revision 2. A table summarizing the differences between the changes proposed in TSTF-360, Revision 1, and those proposed in this LAR is provided for reviewer information.

The changes proposed in this LAR are consistent with similar changes previously approved by the NRC for Clinton Power Station Unit I in Amendment 142 to Facility Operating License No. NPF-62, uClinton Power Station, Unit 1 - Issuance of Amendment (TAC No. MB3071)," dated February 15, 2002, and also for Byron Station Units 1 and 2 in Amendment No. 129 to Facility Operating License Nos.

NPF-37 and NPF-66 and Braidwood Station Units 1 and 2 in Amendment No. 124 to A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

Comanche Peak

Diablo Canyon

Palo Verde

South Texas Project

Wolf Creek A8,)C)I

Document Control Desk PG&E Letter DCL-03-084 July 24, 2003 Page 2 Facility Operating License Nos. NPF-72 and NPF-77, "Byron Station, Units 1 and 2, and Braidwood Station, Units I and 2 - Issuance of Amendments (TAC Nos MB4450, MB4451, MB4448, and MB4449)," dated September 19, 2002.

This LAR proposes changes that would adopt the current NUREG-1431, Revision 2, Standard Technical Specifications model for the direct current (DC) electrical power systems. These changes include new Conditions and Required Actions allowing inoperable DC subsystem batteries and battery chargers to be addressed separately. The proposed changes also provide new actions for the restoration of inoperable battery chargers, as well as providing alternate battery charger testing criteria. These changes are being proposed to support performance of periodic on-line battery maintenance and post-maintenance testing. This potentially reduces demands on plant refueling outages, improving battery availability during shutdown.

Changes are also proposed that reorganize and revise the TS associated with the monitoring and maintenance of the station batteries. These changes include the addition of specific required actions and surveillance requirements associated with out-of-limits conditions for battery cell float voltage, float current (in lieu of specific gravity monitoring), electrolyte level, and electrolyte temperature, and the relocation of battery maintenance and monitoring activities to owner-controlled programs based on the recommendations of industry standard IEEE 450-1995. These changes will provide for better control of these requirements, assure that each battery is maintained at acceptable levels of performance, allow flexibility to monitor and control these limits to values directly related to the battery's ability to perform its assumed function, and allow the TS to focus on parameter value degradations that approach levels that may impact battery operability.

In summary, the proposed changes support performance of periodic on-line battery maintenance and post-maintenance testing and will provide increased operational flexibility and allow more efficient application of plant resources to safety significant activities.

PG&E is submitting this LAR in conjunction with an industry consortium of six plants as a result of a mutual agreement known as Strategic Teaming and Resource Sharing (STARS). The STARS group consists of the six plants operated by TXU Energy, Union Electric Company, Wolf Creek Nuclear Operating Corporation, Pacific Gas and Electric Company, STP Nuclear Operating Company, and Arizona Public Service Company.

Comanche Peak Station is the lead STARS plant for this amendment request. TXU will also submit a similar LAR for Comanche Peak in parallel with this request. The parallel submittal of these LARs is intended to reduce the overall NRC resources required to evaluate and approve the requests. As an aid to the reviewers, brackets have been included in the proposed changes section, Enclosure 1, to indicate where differences exist between the lead plant submittal and the parallel STARS group A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

Comanche Peak

Diablo Canyon

Palo Verde

South Texas Project

Wolf Creek

Document Control Desk PG&E Letter DCL-03-084 July24,2003 Page 3 LARs. The submittal cover letter and the proposed TS Bases changes are each plant-specific. to this LAR provides a detailed description of the proposed changes, a technical analysis of the proposed changes, a no significant hazards consideration determination, a regulatory analysis of the proposed changes, and an environmental evaluation. Enclosure 2 provides the affected TS pages marked-up to reflect the proposed changes. Enclosure 3 provides retyped (clean copy) TS pages. provides the affected TS Bases pages marked-up to reflect the corresponding changes to the Bases. TS Bases changes are provided for reviewer information and will be implemented pursuant to TS 5.5.14, uTechnical Specifications (TS) Bases Control Program." Enclosure 5 contains the retyped TS Bases pages for information only that incorporate the proposed changes. Enclosure 6 provides a table of plant-specific LAR differences from the changes provided in TSTF-360, Revision 1. Enclosure 7 is a single line diagram of the DCPP 125 Volt DC System.

This LAR proposes a change to TS 3.8.4, "DC Sources - Operating," surveillance requirement (SR) 3.8.4.8. A change to TS 3.8.4 SR 3.8.4.8 has also been proposed in PG&E Letter DCL-03-061, 'License Amendment Request 03-07, Revision to Technical Specifications (TS) 3.8.1 'AC Sources - Operating' & 3.8.4 'DC Sources -

Operating' Surveillance Requirements," dated May 29, 2003.

The changes in this LAR are not required to address an immediate safety concern.

PG&E requests approval of the proposed License Amendment by August 1, 2004.

PG&E requests the License Amendments be made effective upon NRC issuance, to be implemented within 60 days from the date of issuance.

Since1yC David H. Oo Vice President and General Manager - Diablo Canyon kjs/4328 Enclosures cc: Edgar Bailey, DHS Thomas P. Gwynn David L. Prouix Diablo Distribution cc/enc: Girija S. Shukla A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway

Comanche Peak

Diablo Canyon

PaloVerde

South Texas Project

WolfCreek

PG&E Letter DCL-03-084 UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION

) Docket No. 50-275 In the Matter of ) Facility Operating License PACIFIC GAS AND ELECTRIC COMPANY) No. DPR-80 Diablo Canyon Power Plant ) Docket No. 50-323 Units l and 2 ) Facility Operating License No. DPR-82 AFFIDAVIT James R. Becker, of lawful age, first being duly sworn upon oath says that he is Vice President - Diablo Canyon Operations and Station Director of Pacific Gas and Electric Company; that he has executed LAR 03-11 on behalf of said company with full power and authority to do so; that he is familiar with the content thereof; and that the facts stated therein are true and correct to the best of his knowledge, information, and belief.

James R7Becker '

James R. Becker' Vice President - Diablo Canyon Operations and Station Director Subscribed and sworn to before me this 24t day of July, 2003.

ILK!05/ 1g~--e-'r F r _ - ofad-Notary Public P. F--

County of San LuiF Obisp 0 State of California Commbssion 1397547 a ~ P& - CaW9on a Nrk-Notary I Us Obspo Courdy I Mii i Comm.-~Exp~ires Feb 1,200710

Enclosure 1 PG&E Letter DCL-03-084 PROPOSED REVISION TO TECHNICAL SPECIFICATIONS ASSOCIATED WITH DC ELECTRICAL POWER SYSTEMS

1.0 DESCRIPTION

PG&E requests an amendment to Facility Operating License Nos. DPR-80 and DPR-82 for Units 1 and 2 of the Diablo Canyon Power Plant (DCPP) respectively. The proposed amendment will revise the DCPP Units 1 and 2 Technical Specifications (TS) Section 3.8.4, "DC Sources - Operating," TS Section 3.8.5, "DC Sources - Shutdown," and TS Section 3.8.6, "Battery Cell Parameters," and add a new TS Section 5.0 Administrative Control Program, "Battery Monitoring and Maintenance Program," which is based on the recommendations of Institute of Electrical and Electronics Engineers (IEEE)

Standard 450, 1995 (IEEE 450-1995).

The proposed changes provide new Conditions and Required Actions allowing inoperable direct current (DC) subsystem batteries and battery chargers to be addressed separately. The proposed changes also provide new actions for the restoration of inoperable battery chargers, as well as providing alternate battery charger testing criteria.

Inaddition, changes are proposed that revise the TS associated with the monitoring and maintenance of the station batteries. These include the addition of specific Required Actions and Surveillance Requirements associated with out-of-limits conditions for battery cell float voltage, float current (in lieu of specific gravity monitoring), electrolyte level, and electrolyte temperature, and the relocation of battery maintenance and monitoring activities to a new program based on the recommendations of IEEE 450-1995. These changes will provide for better control of these requirements, assure that each battery is maintained at acceptable levels of performance, allow flexibility to monitor and control these limits to values directly related to the battery's ability to perform its assumed function, and allow the TS to focus on parameter value degradations that approach levels that may impact battery operability.

Except where modified to account for plant-specific differences, the proposed changes are based on NRC-approved Industry/Technical Specifications Task Force (TSTF) Standard Technical Specification Change Traveler, TSTF-360, "DC Electrical Rewrite," Revision 1, as incorporated in NUREG-1431, Revision 2, "Standard Technical Specifications, Westinghouse Plants," dated June 2001. A table of plant-specific differences from the proposed changes approved in TSTF-360, Revision 1, is provided in Enclosure 6.

Any changes to the Final Safety Analysis Report Update (FSARU) required as a result of this license amendment request (LAR) will be incorporated in accordance with 10 CFR 50.71(e).

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Enclosure I PG&E Letter DCL-03-084

2.0 PROPOSED CHANGE

The following list summarizes the overall proposed changes to the DC electrical power systems TS. For ease of reference, this list is numbered to correspond with the list of changes included in TSTF-360, Revision 1, and is referred to throughout this section:

(1) Provide new Conditions and Required Actions specific to the battery chargers and batteries in each DC electrical power subsystem.

(2) Relocate preventive maintenance-type Surveillance Requirements (SR) to licensee-controlled programs.

(3) Add alternate criteria for battery charger testing.

(4) Replace battery specific gravity monitoring with float current monitoring.

(5) Relocate the following to a licensee-controlled program based on IEEE 450, and/or to the TS Bases, including:

(a) Category A and B limits for battery cell float voltage and electrolyte level, along with the associated compensatory actions; (b) Category C specific value limit for electrolyte level; (c) Specific value limit for electrolyte temperature; and (d) Specific value for the minimum battery charging float voltage, and (e) New TS Administrative Control Program [5.5.17] to reference actions for cell voltage and electrolyte level.

(6) Add specific Required Actions and increased Completion Times for out-of-limits conditions for battery cell float voltage, float current, electrolyte level, and electrolyte temperature and the associated SRs.

(7) Provide enhanced Bases for the proposed changes.

(8) Eliminate the "once per 60 month" restriction on replacing the battery service test with the battery modified performance test. [Note: this change was previously incorporated into the DCPP TS during implementation of the improved TS (ITS) by amendments 135/135 and is included here for information only]

Additional administrative, renumbering, and editorial changes are also associated with the above list of proposed changes and include:

(9) Relocate SR 3.8.4.8 to TS Section 3.8.6 on battery operability.

(10) Delete reference to "Cell" from Section Headings of Limiting Condition for Operation (LCO) 3.8.6.

The following paragraphs describe the proposed changes as they apply to individual TS sections 3.8.4 "DC Sources - Operating," TS 3.8.5 'DC Sources

- Shutdown," TS 3.8.6 uBattery Cell Parameters," and TS Section 5.5 "Programs and Manuals." As an aid to the reviewers, brackets have been included to indicate where differences exist between this LAR and that submitted by TXU Energy for Comanche Peak Station.

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Enclosure 1 PG&E Letter DCL-03-084 TS 3.8.4 "DC Sources - Operating" Proposed Chanae (1)

New Conditions and their associated Required Actions are added to TS LCO 3.8.4. These Conditions and Required Actions will provide compensatory actions specific to the battery chargers and batteries in each DC electrical power subsystem.

a) New TS 3.8.4 Condition A addresses the condition where [one battery charger) in one DC electrical power subsystem becomes inoperable.

Required Actions are proposed that provide a tiered response that focuses on returning the [battery affected by the inoperable charger] to the fully charged state and restoring a fully qualified charger to operable status in a reasonable time.

TS 3.8.4 Required Action A.1 requires that the battery terminal voltage

[associated with the inoperable battery charger] be restored to greater than or equal to the minimum established float voltage within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months .

TS 3.8.4 Required Action A.2 requires verification that the battery float current [associated with the inoperable battery charger] be less than or equal to 2 amps within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months .

The final TS 3.8.4 Required Action A.3 limits the restoration time for the

[inoperable battery charger] to [14 days].

b) New TS 3.8.4 Condition B is added to address the condition where [one battery] in one DC electrical power subsystem becomes inoperable. The associated Required Action B.1 to restore the [affected battery] to operable status is unchanged from the actions necessary to meet the current TS 3.8.4 Required Action A.1, to restore the inoperable DC electrical power subsystem to operable status within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months .

c) The current TS 3.8.4 Condition A is renumbered to new TS 3.8.4 Condition C to reflect the addition of the proposed 2 new Conditions discussed above, and is clarified by adding the stipulation "for reasons other than Condition A or B." [Current TS 3.8.4 Condition B is renumbered to new Condition D. The current Condition B statement 'Any DC bus not receiving power from its associated alternating current (AC) electrical power distribution subsystem" is deleted since it is replaced by new Condition A for an inoperable battery charger. Current TS 3.8.4 Condition C is renumbered to Condition E consistent with the changes above.]

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Enclosure 1 PG&E Letter DCL-03-084 Proposed Change (2)

Preventative maintenance type Surveillance Requirements SR 3.8.4.2, SR 3.8.4.3, SR 3.8.4.4, and SR 3.8.4.5 are relocated to licensee-controlled programs based on IEEE 450 practices.

Proposed Change (3)

Alternate battery charger acceptance criteria are added to current SR 3.8.4.6 which is renumbered to be SR 3.8.4.2. This change allows an actual in-service demonstration that the charger can recharge the associated battery to the fully charged state within [12] hours while supplying the largest combined demands of the various continuous steady state loads after a battery discharge to the bounding design basis event discharge state.

Proposed Chanae (5 d)

Surveillance Requirement SR 3.8.4.1 is revised to "Verify battery terminal voltage is greater than or equal to the minimum established float voltage." The current SR 3.8.4.1 specific value of "2 [130] V' while on float charge will be relocated to the TS Bases.

[Surveillance Requirement SR 3.8.4.6 (renumbered to be SR 3.8.4.2) is revised to "Verify each battery charger supplies Ž 400 amps at greater than or equal to the minimum established float voltage for Ž4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months ". The current SR 3.8.4.6 specific value of "> 130 V" on float charge will be relocated to the TS Bases.]

Proposed Change (8)

TSTF-360, Revision 1, includes a proposed change to NOTE 1 of SR 3.8.4.7 (renumbered to be SR 3.8.4.3) that would eliminate the "once per 60 month" restriction on replacing the battery service test with the battery modified performance discharge test. However, this specific TSTF-360 change is not included in this submittal because it has been previously incorporated in SR 3.8.4.7 by [Amendments 135/135 to the DCPP TS approved by the NRC in the letter "Conversion to Improved Technical Specifications for Diablo Canyon Power Plant, Units 1 and 2 - Amendment No. 135 to Facility Operating License Nos. DPR-80 and DPR-82 (TAC Nos. M98984 and M98985)," dated May 28, 1999].

Proposed Change (9)

The current SR 3.8.4.8, which is a test of battery capacity, is moved to TS Section 3.8.6 on uBattery Parameters", and renumbered to be SR 3.8.6.6.

4

Enclosure 1 PG&E Letter DCL-03-084 Renumbering changes to TS 3.8.4 SR 3.8.4.6 is renumbered to be SR 3.8.4.2, and SR 3.8.4.7 is renumbered to be SR 3.8.4.3 due to the relocation of the preventative maintenance type SRs from TS as described in Proposed Change (2). Similarly, the references to SR 3.8.4.8 and SR 3.8.4.7 in NOTE 1 accompanying current SR 3.8.4.7 are renumbered to be SR 3.8.6.6 and SR 3.8.4.3, respectively.

TS 3.8.5 "DC Sources - Shutdown" Proposed Chanae (1)

[TSTF-360, Revision 1, includes changes to TS LCO 3.8.5 that are similar to those in Proposed Change (1) to TS 3.8.4. These changes would add new Conditions and Required Actions specific to inoperable battery chargers during shutdown conditions. However, in accordance with the "Reviewer's Note" provided for LCO 3.8.5 in NUREG-1431, Revision 2, the option to adopt this change to LCO 3.8.5 does not apply to plants having a pre-ITS licensing basis for electrical power requirements during shutdown conditions that required only one DC electrical power subsystem to be operable. Prior to implementation of the ITS for DCPP in License Amendments 135/135, TS 3.8.2.2 required, as a minimum during Modes 5 and 6, one 125 V DC bus energized from its associated battery bank and full-capacity charger supplied from its associated operable AC vital bus. In addition, TS 3.8.3.2 required, as a minimum during Modes 5 and 6, one 125 V battery bank and an associated full capacity charger to be operable. Therefore, this change is not applicable to DCPP and is not included in this submittal.]

Renumbering changes to TS 3.8.5 Current SR 3.8.5.1 is revised to delete references to the SRs relocated from TS 3.8.4 and to update the references contained in the NOTE accompanying SR 3.8.5.1 to correspond to the renumbering changes made in TS 3.8.4.

TS 3.8.6 "Battery Cell Parameters" Proposed Chanae (4)

The proposed change replaces the current TS 3.8.6 and Table 3.8.6-1 battery specific gravity monitoring activities and limits with float current monitoring by adding new TS 3.8.6 Condition B and new SR 3.8.6.1.

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Enclosure 1 PG&E Letter DCL-03-084 Proposed Changes (5 a. b. c. d, and e)

The current TS Table 3.8.6-1 specific Category A and B limits for electrolyte level and float voltage along with their associated compensatory actions, the Category C specific limiting value for electrolyte level, and the specific limiting value for pilot cell electrolyte temperature from the current SR 3.8.6.3, are relocated to licensee-controlled programs based on IEEE 450-1995. The Category C specific value for the minimum battery charging float voltage is relocated to the TS Bases. The associated compensatory actions for battery cell float voltage and electrolyte level not within limits are specified by new TS [5.5.171 administrative control program requirements to be included in a licensee-controlled program based on the recommendations of IEEE 450-1995 or the battery manufacturer. (Category A, B, and C limits on specific gravity are replaced with float current monitoring requirements as described in Proposed Change (4).)

Proposed Change (6)

New Conditions are added to TS LCO 3.8.6 to provide compensatory actions for a specific abnormal battery condition. The proposed changes provide specific Required Actions and increased Completion Times for out-of-limit conditions for cell float voltage, float current, electrolyte level, and electrolyte temperature.

a) TS 3.8.6 Condition A is added to address the condition where [one battery]

on one DC electrical power subsystem has one or more battery cells with float voltage less than 2.07 V.

b) TS 3.8.6 Condition B is added to address the condition where [one battery]

on one DC electrical power subsystem has float current greater than 2 amps.

c) TS 3.8.6 Condition C is added to address the condition where [one battery]

on one DC electrical power subsystem has one or more battery cells with electrolyte level less than the minimum established design limits.

d) TS 3.8.6 Condition D is added to address the condition where [one battery]

on one DC electrical power subsystem has pilot cell electrolyte temperature less than the minimum established design limits.

e) TS 3.8.6 Condition E is added to address the condition where [two or more batteries] in redundant DC electrical power subsystems have battery parameters not within limits.

f) Current TS 3.8.6 Condition B is renumbered to be Condition F. The current Condition B consists of three separate entry conditions. As part of this proposed change, the last two entry conditions of one or more batteries found 6

Enclosure 1 PG&E Letter DCL-03-084 with an average electrolyte temperature of less than [600FJ, or one or more batteries found with battery cell parameters not within Category C limits, are replaced with a new condition requiring entry when [one battery] on one DC electrical power subsystem has one or more battery cells with float voltage of less than 2.07 V and float current greater than 2 amps.

Also, current Surveillance Requirements SR 3.8.6.1, SR 3.8.6.2, and SR 3.8.6.3 are replaced by the following five new surveillance requirements:

SR 3.8.6.1 Verify each battery float current is s 2 amps. Frequency: 7 days SR 3.8.6.2 Verify each battery pilot cell voltage is > 2.07 V.

Frequency: 31 days SR 3.8.6.3 Verify each battery connected cell electrolyte level is greater than or equal to minimum established design limits.

Frequency: 31 days SR 3.8.6.4 Verify each battery pilot cell temperature is greater than or equal to minimum established design limits. Frequency: 31 days SR 3.8.6.5 Verify each battery connected cell voltage is a 2.07 V.

Frequency: 92 days Proposed Chanae (10)

To reflect the above changes, the word "Cell" is deleted from TS 3.8.6 and the LCO is revised to delete its reference to Table 3.8.6-1, "Battery Cell Parameters Requirements," which is also deleted.

TS Administrative Controls Section 5.5 Proposed Change (5 e)

A new TS [5.5.17] administrative controls program requirement is added to reference actions for battery cell float voltage and electrolyte level and to create a TS "Battery Monitoring and Maintenance Program." This program will provide for restoration and maintenance actions consistent with the recommendations of IEEE 450-1995, or of the battery manufacturer.

In addition, the mark-up of the TS Section 5.5 administrative control program description provided by TSTF-360, Revision 1, is modified in this submittal by substituting the phrase "below the top of the plates" in paragraph b. for required actions for battery cells discovered with electrolyte level "below the minimum established design limit."

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Enclosure 1 PG&E Letter DCL-03-084 The mark-up of the TS Section 5.5 administrative control program description provided by TSTF-360, Revision 1, is also modified in this submittal by removing the specific reference to the version (year) of IEEE 450. This modification to the proposed change is reasonable based on the specific commitment to IEEE 450-1995 that is provided in this LAR, and that the committed to version of IEEE 450-1995 is included as a specific reference in the revised Bases. This modification to the proposed Battery Monitoring and Maintenance Program description is also consistent with the TSTF Response to NRC Comment number 4 on TSTF-360, Revision 0, dated August 11, 2000, which is included in TSTF-360, Revision 1, as Attachment 3. This change will allow for future programmatic upgrades to approved standards without necessitating a license amendment.

Enclosure 2 provides the affected TS pages marked-up to reflect the proposed changes. Enclosure 3 provides retyped (clean copy) TS pages.

Enhanced Bases for the proposed changes Proposed Chanae (7)

The proposed changes to TS 3.8.4, TS 3.8.5, and TS 3.8.6 and the accompanying Bases sections incorporate the information and descriptions provided in TSTF-360, Revision 1, as applicable to the plant-specific configuration. The DC electrical systems Bases have undergone revisions to include substantial information and basis in support of the proposed changes to the specifications. Enclosure 4 provides the affected TS Bases pages marked-up to reflect the corresponding changes to the Bases. Enclosure 5 provides retyped TS Bases pages which incorporate the proposed changes. The revised Bases sections are provided for information only. Changes to the associated Bases will be implemented pursuant to TS 5.5.14, TS Bases Control Program.

3.0 BACKGROUND

3.1 Bases for the Current Requirements TS 3.8.4 "DC Sources - Operating"

[The Class 1E DC electrical power system provides the AC emergency power system with control power. It also provides both motive and control power to selected safety related equipment and backup 120 V AC vital bus power via inverters. As required by 10 CFR 50, Appendix A, General Design Criterion 17, the Class I E DC electrical power system is designed to have sufficient independence, redundancy, and testability to perform its safety functions, assuming a single failure. The DC electrical power system also 8

Enclosure 1 PG&E Letter DCL-03-084 conforms to the recommendations of Regulatory Guide 1.6, 'Independence Between Redundant Standby (Onsite) Power Sources and Between Their Distribution Systems," dated March 10, 1971, and IEEE Standard 308-1971, "Standard Criteria for Class 1E Power Systems for Nuclear Power Generating Stations," dated 1971.

The 125 V DC electrical power system consists of 3 independent safety related Class 1E DC electrical power subsystems. Each subsystem consists of 1 dedicated 60-cell 125 V DC battery (Batteries 11(21), 12(22), and 13(23)), 1 dedicated battery charger (Battery Chargers 11 (21), 12(22), and 132(232)), a backup charger, and all the associated switchgear, control equipment, and interconnecting cabling. A single line diagram of the DCPP 125 V DC system is contained in Enclosure 7.

The backup chargers provide backup service in the event that the dedicated battery charger is out of service. There are two backup chargers for the three Class 1E DC subsystems. One backup charger (Backup Charger 121(221)) is shared between 2 Class 1E DC subsystems and supplies either Battery 11(21) or Battery 12(22). The other backup charger (Backup Charger 131(231)) is dedicated to the third Class IE DC subsystem and supplies Battery 13(23). For each battery, the backup charger is supplied from a different 480 V vital AC bus than the dedicated charger is supplied from. There are certain backup battery charger alignments wherein one of the 480 V vital AC busses supplies 2 battery chargers, aligned to different DC busses. During these backup battery charger alignments, the requirements of independence and redundancy between subsystems are not maintained. As a result, operation with more than 1 charger receiving power simultaneously from a single 480 V vital AC bus or any DC bus not receiving power from its associated AC electrical power distribution subsystem is limited to 14 days by current TS 3.8.4 Condition B.

During normal operation, the 125 V DC load is powered from the battery chargers with the batteries floating on the system. In case of loss of normal power to the battery charger, the DC load is automatically powered from the station batteries. Each battery has adequate storage capacity to carry the required load continuously for at least 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months .

The DC electrical power subsystems provide the control power for its associated Class 1E AC power load group, 4.16 kV switchgear, and 480 V load centers. The DC electrical power subsystems also provide DC electrical power to the inverters, which in turn are backup sources to power the 120 V AC vital buses.

Each 125 V DC battery is separately housed in a ventilated room apart from its charger and distribution centers. Each subsystem is located in an area 9

Enclosure 1 PG&E Letter DCL-03-084 separated physically and electrically from the other subsystem to ensure that a single failure in one subsystem does not cause a failure in a redundant subsystem.

The batteries for the 3 DC electrical power subsystems are sized to produce required capacity at 80 percent of nameplate rating, corresponding to warranted capacity at end of life cycles and the 100 percent design demand.

The voltage limit is 2.13 V per cell, which corresponds to a total minimum voltage output of 128 V per battery. Surveillance 3.8.4.1 verifies that the battery terminal voltage is greater than or equal to 130 V on float charge.

Each DC electrical power subsystem has ample power output capacity for the steady state operation of connected loads required during normal operation, while at the same time maintaining its battery bank fully charged.

Each battery charger also has sufficient capacity to restore the battery from the design minimum charge to its fully charged state within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months while supplying normal steady state loads.

The initial conditions of design basis accident (DBA) and transient analyses assume that engineered safety feature (ESF) systems are operable. The DC electrical power system provides normal and emergency DC electrical power for the DGs, emergency auxiliaries, and control and switching during all MODES of operation.

The operability of the DC sources is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining the DC sources operable during accident conditions in the event of an assumed loss of all offsite AC power or all onsite AC power; and a worst case single failure.

The DC electrical power subsystems, each subsystem consisting of one battery, battery charger for each battery and the corresponding control equipment and interconnecting cabling supplying power to the associated bus are required to be operable to ensure the availability of the required power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence (AOO) or a postulated DBA. Loss of any one DC electrical power subsystem does not prevent the minimum safety function from being performed.

An operable DC electrical power subsystem requires the battery and its normal or backup charger to be operating and connected to the associated DC bus.]

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Enclosure I PG&E Letter DCL-03-084 TS 3.8.5 "DC Sources - Shutdown"

[The DC electrical power subsystems, each subsystem consisting of one battery, 1 battery charger per battery, and the corresponding control equipment and interconnecting class 1E cabling within the subsystem, are required to be operable in Modes 5 and 6, and during movement of irradiated fuel assemblies, to support required trains of the distribution systems required operable by LCO 3.8.10, "Distribution Systems-Shutdown."

An operable subsystem consists of a DC bus connected to a battery with an operable battery charger which is fed from an operable AC vital bus.

With administrative controls in place, DC buses may be cross-tied when a battery is taken out for maintenance provided that the battery and the Class 1E cross-tie has sufficient capacity and protection for its own loads and the cross-tie loads. The resulting circuit is not required to be single failure resistant. This ensures the availability of sufficient DC electrical power sources to operate the unit in a safe manner and to mitigate the consequences of postulated events during shutdown (e.g. fuel handling accidents).]

TS 3.8.6 "Battery Cell Parameters" This LCO delineates the limits on electrolyte temperature, level, float voltage, and specific gravity for the DC power source batteries. A discussion of these batteries and their operability requirements is provided in the Bases for LCO 3.8.4, "DC Sources - Operating," and LCO 3.8.5, "DC Sources -

Shutdown."

Battery cell parameters must remain within acceptable limits to ensure availability of the required DC power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence or a postulated DBA. Electrolyte limits are conservatively established, allowing continued DC electrical system function even with Category A and B limits not met.

The battery cell parameters are required solely for the support of the associated DC electrical power subsystems. Therefore, battery operability is only required when the DC power source is required to be operable. Refer to the Applicability discussion in Bases for LCO 3.8.4 and LCO 3.8.5.

3.2 Need for Revision of the Requirements The current TS for the DC electrical power subsystem does not contain a separate Action for an inoperable battery. The changes proposed in this LAR are in accordance with those provided in NRC approved Industry/TSTF 11

Enclosure 1 PG&E Letter DCL-03-084 Standard TS Change Traveler, TSTF-360, Revision 1, "DC Electrical Rewrite," and incorporated in NUREG-1431, Revision 2. The changes provide new actions for the restoration of an inoperable battery charger and an inoperable battery, as well as alternate battery charger testing criteria.

These changes are being proposed to support performance of periodic on-line battery maintenance and post-maintenance testing. This potentially reduces demands on plant refueling outages, improving battery availability during shutdown.

The proposed changes also provide for the relocation of battery maintenance and monitoring activities to owner-controlled programs based on the recommendations of IEEE 450-1995. This will provide for better control of these requirements, assure that each battery is maintained at acceptable levels of performance, allow flexibility to monitor and control these limits to values directly related to the battery's ability to perform its assumed function, and allow the TS to focus on parameter value degradations that approach levels that may impact battery operability.

Overall, these changes will provide increased operational flexibility and allow more efficient application of plant resources to safety significant activities.

4.0 TECHNICAL ANALYSES 4.1 TS Chanaes The following subsections provide an analysis of the proposed changes.

Proposed Change (1). New Conditions and Required Actions for battery chargers and batteries a) [TS 3.8.4 Condition A currently applies to uOne DC electrical power subsystem inoperable" and Condition B applies to "More than one full capacity charger receiving power simultaneously from a single 480 V vital bus OR Any DC bus not receiving power from its associated AC electrical power distribution system." Current TS 3.8.4 Condition B applies if there is an inoperable dedicated battery charger. TS 3.8.4 does not currently contain an action for one battery inoperable.] To allow for a range of possible degradations to the DC System, the proposed change revises the current TS 3.8.4 format to add two new Conditions; Condition A that is specific to an inoperable [battery charger], and Condition B that is specific to an inoperable [battery].

The proposed wording of new TS 3.8.4 Condition A, ["One battery charger inoperable," incorporates the plant specific wording recommended in TSTF-360, Revision 1 for a DC electrical subsystem 12

Enclosure 1 PG&E Letter DCL-03-084 design which during normal operation has one battery charger per subsystem. The phrase 'on one train" recommended by TSTF-360, Revision I is not included in Condition A since one battery charger is equivalent to one dedicated battery charger on one subsystem (train) for the DCPP DC electrical subsystem design.]

[With any DC bus not receiving power from its associated AC electrical power distribution system, the proposed new Condition A for one battery charger inoperable will apply. Therefore, new Condition A replaces the portion of current Condition B which applies to any DC bus not receiving power from its associated AC electrical power distribution subsystem.]

[The current TS 3.8.4 Condition B Required Action B.1 for an inoperable battery charger requires that the DC electrical subsystem be restored to a configuration wherein each charger is powered from its associated 480 volt vital bus within 14 days. The primary role of the battery charger is in support of maintaining the operability of its associated battery. This is accomplished by the charger being of sufficient size to carry the normal steady state DC loads, with sufficient additional capacity to provide some minimal over-potential to the battery. A secondary safety significant function can be attributed to carrying the post-accident DC load after restoration of AC power (typically 10-13 seconds, the time required for the emergency diesel generator to tie on to its emergency bus). In analyzed post-accident scenarios, there is no safety related criteria for recharging a fully discharged battery in any specific time period.]

The new proposed TS 3.8.4 Required Action A.3 provides a [14-day]

allowed restoration time to restore the battery charger to operable status similar to current TS 3.8.4 Condition B which allows continued operation with an inoperable battery charger for up to [14 days]. However, this time is now contingent on a focused three-tiered approach to assuring adequate battery capability is maintained.

With an inoperable battery charger, the first priority for the operator is to minimize the associated battery discharge. Proposed TS 3.8.4 Required Action A. 1 provides a first tier action that ensures that the associated battery discharge is terminated within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months by requiring that battery terminal voltage be restored to a value greater than or equal to the battery minimum established float voltage within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months . This assumes that the battery is still capable of performing its required function. During this 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months ,.if the affected DC electrical power subsystem battery is not capable of performing its required function, the remaining DC electrical power subsystems are available to perform the required function. This time allows for restoring the inoperable battery charger or for providing an 13

Enclosure 1 PG&E Letter DCL-03-084 alternate means of restoring battery terminal voltage to a value greater than or equal to the minimum established float voltage. Since the focus of the proposed allowance is that battery capacity be preserved and assured, the means of accomplishing this is left to plant capabilities. In most cases, the backup battery charger would be employed within the initial 2-hours. In other cases, other means, including a degraded normally in service dedicated charger or a non-Class-1 E charger, would be employed to float the battery. Presuming that the associated battery discharge, if occurring, is terminated and that its DC bus remains energized, as required by separate LCO 3.8.9, then there is reasonable basis for extending the restoration time for an inoperable battery charger beyond the Required Action A.1 2-hour limit to [14 days]. [The addition of this first tier Action is acceptable since it is a new Action which is not required by current TS 3.8.4 Required Action B.1 for an inoperable battery charger.]

The second tier TS 3.8.4 Required Action A.2 proposes that within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , it is established that the battery has sufficient capacity to perform its assumed duty cycle as measured by float current less than or equal to 2 amps. This allows time for some recharging of lost capacity that may have occurred during the initial 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months . A discharged battery having terminal voltage of at least the minimum established float voltage indicates that the battery is on the exponential charging current portion of its recharge cycle. The time to return a battery to its fully charged state under this condition is a function of the amount of the previous discharge and the recharge characteristic of the battery. In this condition, there is good assurance of fully recharging the battery within the proposed 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . [The Completion Time of "once every 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months " recommended by TSTF-360, Revision 1 is changed to "12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months ." A battery with float current greater than 2 amps for greater than 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months would be inoperable per new TS 3.8.6 Condition B and new TS 3.8.6 Condition F would require entry into new TS 3.8.4 Condition B. New TS 3.8.4 Condition B would require the current to be restored to less than 2 amps within an additional 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months or a unit shutdown to Mode 3 would have to be initiated per new TS 3.8.4 Condition E. Therefore, a unit shutdown will be initiated within 14 hours1.62037e-4 days 0.00389 hours 2.314815e-5 weeks 5.327e-6 months for a battery with float current greater than 2 amps whether the TS 3.8.4 Condition A Completion Time is once every 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months or within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months . Therefore, verification of the battery float current only once within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months is acceptable since it results in the same required shutdown time as if the battery float current is verified every 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months for a battery with float current greater than 2 amps. The addition of this second tier Action is acceptable since it is a new Action which is not required by current TS 3.8.4 Required Action B.1 for an inoperable battery charger.]

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Enclosure 1 PG&E Letter DCL-03-084 The third tier TS 3.8.4 Required Action A.3 would provide [14] days for the battery charger to be restored to operable status. [The Completion Time of 7 days recommended by TSTF-360, Revision 1 is changed to 14 days since current TS 3.8.4 Condition B allows continued operation with an inoperable dedicated battery charger for 14 days. The 14-day completion time for an inoperable battery charger was approved for DCCP in Amendment 6 to Facility Operating License DPR-80 and Amendment 4 to Facility Operating License DPR-82 in an NRC letter dated April 18, 1986, based on PG&E letter DCL-85-278, "License Amendment Request 85-07, Revision 1; Combined Technical Specification Changes, Specifications 3.8.2.1 and 3.8.2.2,u dated August 27, 1985, and information provided in PG&E letter DCL-85-214, "Supplemental Information to License Amendment Request 85-07,"

dated June 14, 1985. The staff found the 14-day Completion Time to be acceptable since it ensures that the independence required by 10 CFR 50 Appendix A General Design Criterion 17 is not unduly compromised with the battery chargers operated in a cross-aligned configuration (i.e. a dedicated battery charger inoperable with the associated backup charger providing current to the DC bus).]

b) The proposed wording of new TS 3.8.4 Condition B, ["One battery inoperable]," similarly incorporates the plant specific wording recommended in TSTF-360, Revision 1 for a DC electrical subsystem design which during normal operation has one battery per subsystem.]

[The phrase "on one train" recommended by TSTF-360, Revision 1 is not included in Condition A since 1 battery is equivalent to 1 battery on 1 subsystem (train) for the DCPP DC electrical subsystem design.

The proposed new TS 3.8.4 Condition B is added to separately address the condition of [one battery] in one DC electrical power subsystem inoperable. For an inoperable battery, the associated DC bus is being supplied by its associated dedicated battery charger. Any event that results in a loss of the AC bus supporting the associated dedicated battery charger will also result in a loss of DC power to the loads fed from the affected DC bus. Recovery of the AC bus, especially if it is due to a loss of offsite power, will be hampered by the fact that many of the components necessary for the recovery (e.g., diesel generator control and field flash, AC load shed, and diesel generator output circuit breakers, etc.) may rely upon one of the batteries of the affected DC subsystem. The proposed Completion Time for restoration of the inoperable batteries is unchanged from the existing 2-hour limit for restoration of the DC electrical power subsystem (even assuming the dedicated charger associated with the battery is operable) and allows sufficient time to effect restoration of the inoperable [battery], given that the majority of the conditions that lead to [battery] inoperability (e.g., loss 15

Enclosure 1 PG&E Letter DCL-03-084 of the associated battery charger or battery cell voltages less than 2.07 V) are identified, along with specific actions and completion times, in the DC electrical power systems TS Sections 3.8.4, 3.8.5, and 3.8.6.

c) The existing TS 3.8.4 Condition A is renumbered to Condition C and revised to "One DC electrical power subsystem inoperable for reasons other than Condition A or B." Because the combined scope of the proposed new and revised Conditions is the same as currently addressed by TS 3.8.4 Conditions A, B, and C, the proposed change to reformat the existing Condition A is considered editorial. The 2-hour Completion Time for new Condition C is unchanged from the current TS 3.8.4 Condition A Completion Time which is based on Regulatory Guide 1.93, "Availability of Electric Power Sources."

[Current TS 3.8.4 Condition B is renumbered to new Condition D and the portion of current Condition B which applies to "Any DC bus not receiving power from its associated AC electrical power distribution subsystem" is removed. This is acceptable since this portion of current Condition B is replaced by the new Condition A for an inoperable battery charger and the 14-day Completion Time to restore the battery charger to operable status is unchanged.]

Current TS 3.8.4 Condition [C] is renumbered to Condition [EJ consistent with the changes above. This change is an editorial change.

Proposed Chanae (2). Relocation of preventive maintenance Surveillance Requirements to a licensee-controlled program In accordance with SR 3.0.1, when any SR is not met, the LCO is not met.

This is based on the premise that SRs represent the minimum acceptable requirements for operability of the required equipment. However, for current SR 3.8.4.2, SR 3.8.4.3, SR 3.8.4.4, and SR 3.8.4.5, failure to meet the SR does not necessarily mean that the equipment is not capable of performing its safety function, and the corrective action is generally a routine or preventive maintenance activity. For example, the Bases of SR 3.8.4.4 identify removal of visible corrosion and tightening of terminal connections as a preventive maintenance SR. SR 3.8.4.3, requiring visible inspection for physical damage or deterioration that could potentially degrade battery performance, is not required for the battery to perform its safety function, but again reflects ongoing preventive maintenance activities. Although excessive corrosion or loose terminals could impact battery operability, the maintenance activities will prevent degradation which could affect battery operability. These activities are inappropriate for operability SRs and are generally better controlled under the maintenance programs for batteries.

With regard to the resistance verifications of SR 3.8.4.2 and SR 3.8.4.5, the 16

Enclosure 1 PG&E Letter DCL-03-084 values are nominal values and represent values at which some action should be taken, not necessarily when the operability of the battery is in question.

The safety analyses do not assume a specific battery resistance value, but typically assume the batteries will supply adequate power. Therefore, the key issue is the overall battery resistance. Between surveillances, the resistance of each connection varies independently from all the others.

Some of these connection resistances may be higher or lower than others, and the battery may still be able to perform its function and should not be considered inoperable solely because one connector's resistance is high.

Overall resistance is a direct impact on operability and is adequately determined as acceptable through completion of the battery service and discharge tests. Therefore, these activities are more appropriately controlled under the maintenance program for batteries. Furthermore, these surveillances are recommended by IEEE 450, and as such, will continue to be addressed by the plant program based on IEEE 450 practices that is being committed to with the adoption of these changes (but not detailed by the new TS Section 5.0 program).

The new battery monitoring and maintenance program described in proposed TS Section [5.5.17] is discussed under Proposed Change (5 e).

The proposed changes also include renumbering of the SRs remaining in TS Section 3.8.4 and revising current SR 3.8.5.1 to similarly renumber the references to the TS Section 3.8.4 SRs. These changes are editorial and do not alter the existing requirements.

Proposed Change (3). Addition of alternate criteria for battery charger testing Current SR 3.8.4.6 (renumbered to be SR 3.8.4.2) requires verification of specific parameters for battery charger performance testing. This test is intended to confirm the charger design capacity. Altemate acceptance criteria are proposed that allow an actual in-service demonstration that the charger can recharge the battery to the fully charged state within [12] hours while supplying the largest combined demands of the various continuous steady state loads, after a battery discharge to the bounding design basis event discharge state. This meets the intent of the existing test and allows for a normal in-place demonstration of the charger capability thereby minimizing the time when the charger would be disconnected from the DC bus.

Proposed Chance (4). Replacement of batterv specific gravity monitoring with float current monitoring This change proposes to replace the requirements of current TS 3.8.6 battery specific gravity monitoring with new TS 3.8.6 conditions and 17

Enclosure 1 PG&E Letter DCL-03-084 surveillance requirements utilizing a suitable operability limit based on float current monitoring to ensure the battery state-of-charge is sufficient to perform its design duty cycle. This has been the focus of significant discussions within the IEEE 450 committee and the NRC technical staff.

Due to the technical nature of the rationale, specific justification has been written to address this change. TSTF-360, Revision 1, provides this justification in Attachment 1, "Battery Primer," and Attachment 2, 'White Paper by Kyle Floyd." These attachments to TSTF-360 and the details included in the proposed Bases provide the justification supporting this change. Insummary, the justification discusses the use of battery float current as an indicator of full charge and the charging characteristics of lead-acid batteries. It concludes that the level of charge may be evaluated by measuring current at a specific voltage, typically the float voltage in normal operation, and that at low float voltage, 2 amps is appropriate for cells with 8-hour capacities of 1000 amp-hours or larger.

Proposed Change (5). Relocation of the following to a licensee-controlled program based on IEEE 450. and/or to the TS Bases (a) Category A and B limits for battery cell float voltage and electrolyte level, along with the associated compensatory actions Current TS Table 3.8.6-1 contains categories of limitations on battery cell float voltage, electrolyte level, and specific gravity parameters. The Category A and B limits reflect nominal fully charged battery parameter values. Significant margin above that required for declaration of an operable battery is provided in these values. These Category A and B values represent appropriate monitoring levels and appropriate preventive maintenance level for long term battery quality and extended battery life. As such, they do not reflect the 10 CFR 50.36, "Technical Specifications," criteria for LCOs of the "the lowest functional capability or performance levels of equipment required for the safe operation of the facility." This change proposes that these values and the actions associated with restoration be relocated to a licensee controlled program that is under the control of 10 CFR 50.59, 'Changes, tests, and experiments." This program complies with the recommendations of IEEE 450-1995. The battery parameter values will continue to be controlled at an acceptable level, and required remedial actions will be implemented in accordance with the plant corrective action program. Furthermore, the batteries and their preventive maintenance and monitoring are under the regulatory requirements of the maintenance rule, 10 CFR 50.65, "Requirements for monitoring the effectiveness of maintenance at nuclear power plants." This relocation will continue to assure the batteries are maintained at acceptable levels of performance, and allow 18

Enclosure 1 PG&E Letter DCL-03-084 the TS to focus on battery parameter degradations that approach levels that may impact battery operability.

(b) Category C specific value limit for electrolyte level, and; (c) The specific value limit for electrolyte temperature These changes propose that the specific limiting values from current TS 3.8.6 Condition B and Table 3.8.6-1 for battery electrolyte temperature and level be relocated to a licensee-controlled program that is under the control of 10 CFR 50.59. New TS 3.8.6 Conditions C and D will require the electrolyte level and temperature to be greater than or equal to minimum established design limits. Depending on the available excess capacity of the associated battery, the minimum electrolyte level and temperature necessary to support operability of the battery can vary. As such, these values do not reflect the 10 CFR 50.36 criteria for LCOs of "the lowest functional capability or performance levels of equipment required for safe operation of the facility," and relocation to a licensee controlled program will allow the flexibility to monitor and control this limit at values directly related to the battery's ability to perform its assumed function.

(d) Specific value for the minimum battery charging float voltage This change proposes to relocate the current TS Table 3.8.6-1 specific limiting value for the minimum battery cell float voltage to the Bases, which are under the change control of 10 CFR 50.59. This change also applies to the relocation to the Bases of the specific limiting value for the minimum operating battery charging float voltage monitored by current SR 3.8.4.1. TS 3.8.4 Condition A will require the battery charger to supply battery terminal voltage greater than or equal to the minimum established float voltage. The battery manufacturer establishes a float voltage range to provide the optimum charge on the battery. The minimum battery cell float voltage will maintain the battery plates in a condition that supports maintaining the grid life of the battery cells. As such, the minimum established float voltage does not reflect the 10 CFR 50.36 criteria for LCOs of "the lowest functional capability or performance levels of equipment required for safe operation of the facility," and can be adequately controlled outside of the TS.

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Enclosure 1 PG&E Letter DCL-03-084 (e) New TS administrative controls program [5.5.17] with actions for cell voltage and electrolyte level This change proposes that the TS 3.8.6 Actions related to cell voltage and electrolyte level be specified by a new administrative controls program TS [5.5.17], 'Battery Monitoring and Maintenance Program."

This program complies with the recommendations of IEEE 450-1995, and includes actions to (1) restore battery cells with float voltage less than 2.13 V, and (2)equalize and test battery cells that had been discovered with electrolyte level below the top of the plates.

Paragraph b. of the new TS [5.5.17] administrative controls program description provided in TSTF-360, Revision 1, is modified in this submittal for required actions for battery cells discovered with electrolyte level below the "minimum established design limit." The phrase 'below the top of the plates" is substituted for "minimum established design limit" to provide consistency with IEEE 450-1995, Annex D, section D.1.

This change is appropriate because the recommended actions of IEEE 450 include that an equalizing charge be performed if electrolyte level is below the top of the plates, while the. minimum established design limit is a level which is above the top of the plates.

The specific reference to the version of IEEE 450 is not included in the TS [5.5.17] program description to allow future programmatic upgrades to approved standards without necessitating a license amendment.

PG&E is presently committed to IEEE 450-1995 as documented in the TS Bases. Changes to the TS Bases are evaluated in accordance with the provisions of 10 CFR 50.59, "Changes, tests, and experiments."

Thus, adequate control over changes to the applicable IEEE 450 exists to allow the specific IEEE 450 reference to be contained in the TS Bases. Eliminating the "year" reference to the applicable IEEE 450 in the TS and maintaining it in the TS Bases is consistent with similar changes previously approved by the NRC in Amendment No. 129 to Facility Operating License No. NPF-37 and Amendment No. 129 to Facility Operating License No. NPF-66 for the Byron Station, Unit Nos. 1 and 2, respectively, and Amendment No. 124 to Facility Operating License No. NPF-72 and Amendment No. 124 to Facility Operating License No. NPF-77 for the Braidwood Station, Unit Nos. 1 and 2, respectively, in letter"Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2 - Issuance of Amendments (TAC NOS. MB4450, MB4451, MB4448, AND MB4449)," dated September 19, 2002, and in TSTF-363, "Revise Topical Report References in ITS 5.6.5, COLR."

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Enclosure 1 PG&E Letter DCL-03-084 Proposed Chanae (6). Addition of specific Required Actions and increased Completion Times for out-of-limits conditions for battery cell float voltage.

float current, electrolyte level, and electrolyte temperature and the associated SRs New TS 3.8.6 specific Required Actions are proposed for parameters that have a unique impact on the battery and is continued operability. The proposed change provides specific TS 3.8.6 Required Actions and increased Completion Times for out-of-limit conditions for cell voltage, float current, electrolyte level, and electrolyte temperature. These allowed times recognize the margins available, the minimal impact on the battery capacity and the capability to perform its intended function, and the likelihood of effecting restoration in a timely fashion avoiding an unnecessary plant shutdown. In addition, SRs are proposed to verify that the batteries are maintained within the established limitations.

The bases for the specific TS 3.8.6 Required Actions, Completion Times, and Surveillance Requirements are as follows.

a) New TS 3.8.6 Condition A addresses a condition where [one battery]

has one or more battery cells with float voltage less than 2.07 V. [The proposed wording of new TS 3.8.6 Condition A, "One battery,"

incorporates the plant specific wording recommended in TSTF-360, Revision 1for a DC electrical subsystem design which has one battery per subsystem. The phrase "on one train" recommended by TSTF-360, Revision 1 is not included in Condition A since one battery is equivalent to one battery on one subsystem (train) for the DCPP DC electrical subsystem design.]

If a battery cell is found to be less than 2.07 V, the battery cell must be considered degraded. This is consistent with the recommendations of IEEE 450 which states that a cell voltage of 2.07 V (typical for nominal 1.215 specific gravity cells) or below under float conditions and not caused by elevated temperature of the cell indicates internal cell problems and may require cell replacement. Cell voltage by itself, however, is not an indication of the state of charge of the battery.

Hence, verification within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months of the required battery charger operability by monitoring the battery terminal voltage (i.e., performance of SR 3.8.4.1), and determining the overall battery state of charge by monitoring the battery float charge current (i.e., performance of SR 3.8.6.1), is considered a reasonable allowed time to complete these actions and assure that there is still sufficient battery capacity to perform the intended function. Therefore, the affected battery is not required to be considered inoperable solely as a result of one or more cells being less than 2.07 V, and continued operation is permitted for a limited 21

Enclosure 1 PG&E Letter DCL-03-084 period up to 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months . Twenty-four hours is considered a reasonable time to effect restoration of the out-of-limit condition.

b) New TS 3.8.6 Condition B addresses a condition where a battery is found with a float current of greater than 2 amps, and indicates that a partial discharge of the battery capacity has occurred. [The proposed wording of new TS 3.8.6 Condition B, uOne battery," incorporates the plant specific wording recommended in TSTF-360, Revision 1 for a DC electrical subsystem design which has one battery per subsystem. The phrase "on one train" recommended by TSTF-360, Revision 1 is not included in Condition B since one battery is equivalent to one battery on one subsystem (train) for the DCPP DC electrical subsystem design.]

A battery with a float current of greater than 2 amps may be due to a temporary loss of a battery charger or possibly due to one or more battery cells in a low voltage condition reflecting some loss of capacity.

Within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , verification of the required battery charger operability is performed by monitoring the battery terminal voltage (i.e., performance of SR 3.8.4.1). If the terminal voltage is found to be less than the minimum established float voltage there are two possibilities, the battery charger is inoperable or is operating in the current limit mode. If the battery charger is found to be inoperable, LCO 3.8.4 Condition A would be entered. If the battery charger is operating in the current limit mode after 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , this is an indication that the battery has been substantially discharged and likely cannot perform its required design functions. The time to return the battery to its fully charged condition in this case is a function of the battery charger capacity, the amount of loads on the associated DC system, the amount of previous discharge, and the recharge characteristic of the battery. Because the charge time can be extensive, if the battery cannot be recharged within the 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months allowed by Required Action B.2, the battery must be declared inoperable.

c) New TS 3.8.6 Condition C addresses a condition where a battery is found with the electrolyte level in 1 or more cells to be less than the minimum established design limits. [The proposed wording of new TS 3.8.6 Condition C, "One battery," incorporates the plant specific wording recommended in TSTF-360, Revision I for a DC electrical subsystem design which has 1 battery per subsystem. The phrase 'on one train" recommended by TSTF-360, Revision 1 is not included in Condition C since 1 battery is equivalent to 1 battery on 1 subsystem (train) for the DCPP DC electrical subsystem design.]

With the electrolyte level in one or more cells found above the top of the battery plates, but below the minimum established design limits, the battery still retains sufficient capacity to perform the intended function.

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Enclosure 1 PG&E Letter DCL-03-084 Therefore, the affected battery is not required to be considered inoperable solely as a result of electrolyte level not met. Within 31 days, the minimum established design limits for electrolyte level must be restored in order to restore its margin.

With electrolyte level below the top of the plates a potential exists for dryout and plate degradation. TS 3.8.6 Required Actions C.1 and C.2 restore the level and ensure that the cause of the loss of electrolyte level is not due to a leak in the battery casing. These actions are only required if the level in the battery is found below the top of the battery plates.

In addition, the battery monitoring and maintenance program described in the proposed TS Section [5.5.17] will require actions, consistent with IEEE 450-1995, to equalize and test battery cells that have been discovered with an electrolyte level below the minimum established level limit.

d) New TS 3.8.6 Condition D addresses the condition where a battery is found with a pilot cell electrolyte temperature less than the minimum established design limits. [The proposed wording of new TS 3.8.6 Condition D, "One battery," incorporates the plant specific wording recommended in TSTF-360, Revision 1 for a DC electrical subsystem design which has I battery per subsystem. The phrase "on one train' recommended by TSTF-360, Revision 1 is not included in Condition D since 1 battery is equivalent to 1 battery on 1 subsystem (train) for the DCPP DC electrical subsystem design.]

A low electrolyte temperature limits the current and power available from the battery. However, since the battery is sized with margin, while battery capacity is degraded, sufficient capacity exists to perform the intended functions. Therefore, the affected battery is not required to be considered inoperable solely as a result of the pilot cell temperature not being met, and the proposed 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months provides a reasonable time to restore the temperature within established limits.

e) New TS 3.8.6 Condition E addresses the condition where [2 or more batteries] in redundant DC electrical power subsystems are found with battery parameters not within established design limits. [The proposed wording of new TS 3.8.6 Condition E, "Two or more batteries,"

incorporates the plant specific wording recommended in TSTF-360, Revision 1 for a DC electrical subsystem design which has 1 battery per subsystem and 3 Class 1E DC electrical power subsystems.]

23

Enclosure 1 PG&E Letter DCL-03-084 Given this condition, there is not sufficient assurance that battery capacity has not been affected to the degree that the batteries can still perform their required function. With redundant DC electrical power subsystems batteries involved, this potentially could result in a total loss of function on multiple systems that rely upon the batteries. The longer completion times specified for battery parameters when only [1 DC electrical power subsystem has a battery with parameters not within limits] are therefore not appropriate, and the parameters must be restored to within limits in at least 1 DC electrical power subsystem within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months .

f) New TS 3.8.6 Condition F revises current Condition B to address the condition where the Required Actions for Condition A, B, C, D, or E are not met. Given this condition, sufficient capacity to supply the maximum expected load requirement is not assured and the corresponding battery must be declared inoperable. Additionally, upon discovering [1 battery]

with 1 or more battery cells float voltage less than 2.07 V and float current greater than 2 amps indicates that the battery capacity may not be sufficient to perform the intended functions and the corresponding battery must be declared inoperable immediately.

New SR 3.8.6.1 will require verification of each battery float current to be less than or equal to 2 amps every 7 days, and is used to determine the state of charge of the battery. Float charge is the condition in which the charger is supplying the continuous charge required to overcome the internal losses of a battery and maintain the battery in a charged state.

The float current requirements are based on the float current indicative of a charged battery. The use of float current to determine the state of charge of the battery and the 7-day frequency for performance of this verification is consistent with TSTF-360, Revision 1.

New SR 3.8.6.2 and SR 3.8.6.5 verify that the float voltage of pilot cells and all connected cells, respectively, are equal to or greater than the short term absolute minimum voltage of 2.07 V, representing the point where battery operability is in question. Optimal long term battery performance is obtained by maintaining a float voltage greater than or equal to a minimum established float voltage, which is established and controlled in accordance with the proposed battery monitoring and maintenance program specified in TS Section [5.5.17]. The battery monitoring and maintenance program will provide necessary actions if the battery is found at a float voltage less than the minimum established float voltage but greater than the short term absolute minimum voltage of 2.07 V. The Frequency for cell voltage verification every 31 days for pilot cells and 92 days for each connected cell is consistent with IEEE 450-1995.

24

Enclosure 1 PG&E Letter DCL-03-084 SR 3.8.6.3 verifies the connected cell electrolyte level of each battery to be greater than or equal to minimum established design limits established in the proposed battery monitoring and maintenance program provided in TS Section [5.5.17]. Operation of the batteries at electrolyte levels greater than the minimum established design limit ensures that the plates do not suffer physical damage and continue to maintain adequate electron transfer capability. The Frequency of every 31 days is consistent with IEEE 450-1995.

SR 3.8.6.4 verifies the temperature of each battery pilot cell to be greater than or equal to the minimum established design limits established in the proposed battery monitoring and maintenance program provided in TS Section [5.5.17]. Maintaining the electrolyte temperature above this level ensures that the battery can provide the required current and voltage to meet the design requirements, since temperatures lower than assumed in the battery sizing calculations act to inhibit or reduce the overall battery capacity. The Frequency of every 31 days is consistent with IEEE 450-1995.

Proposed Chanae (7), Enhanced Bases for the proposed changes The accompanying Bases section for the proposed changes to TS 3.8.4, TS 3.8.5, and TS 3.8.6 are provided for information. The Bases sections have been revised to incorporate the information and discussion presented in TSTF-360, Revision 1, with the exceptions noted and described previously in this enclosure. Changes to the associated Bases will be implemented pursuant to TS 5.5.14, "Technical Specifications Bases Control Program."

Proposed Chanae (8). Elimination of the "once per 60 month" restriction on replacing the battery service test with the battery modified performance test

[TSTF-360, Revision 1, includes a proposed change to NOTE I of SR 3.8.4.7 (renumbered to be SR 3.8.4.3) that would eliminate the "once per 60 month" restriction on replacing the battery service test with the battery modified performance discharge test. However, this specific TSTF-360 change is not included in this submittal because it has been previously incorporated in SR 3.8.4.7 by Amendments 135/135 to the DCPP TS.]

Proposed Change (9). Relocation of SR 3.8.4.8 to TS Section 3.8.6 on batterv operability This proposed change is an administrative change that will move current surveillance requirement SR 3.8.4.8, which is a test of battery capacity, to be directly associated with new TS Section 3.8.6 on battery parameters, which defines the operability requirements of the DC electrical power subsystem 25

Enclosure 1 PG&E Letter DCL-03-084 batteries. The proposed change is acceptable because movement of this SR does not alter the test requirements or test performance frequency.

Failure to satisfy the test will be addressed by the conditions and required actions of DC electrical power subsystem TS LCOs 3.8.4, 3.8.5 and 3.8.6.

Proposed Change (10). Deletion of the reference to "Cell" in LCO 3.8.6 This proposed change to TS LCO 3.8.6 is an editorial change. This LCO is intended to require and define the operability requirements of the DC electrical power subsystem batteries, and is not limited to battery cell parameters or performance.

4.2 Summary The proposed changes to the DC electrical power subsystems specifications TS 3.8.4, TS 3.8.5, and TS 3.8.6, and the addition of new TS administrative control program [5.5.17] requirements for a "Battery Maintenance and Monitoring Program" based on the recommendations of IEEE 450-1995, are consistent, except for noted plant-specific differences, with the considerations and proposed changes provided in NRC-approved lndustryfTSTF Standard TS Change Traveler, TSTF-360, 'DC Electrical Rewrite," Revision 1, as incorporated in recently issued NUREG-1431, "Standard Technical Specifications, Westinghouse Plants," Revision 2.

Each of these proposed changes have been evaluated and determined not to adversely affect nuclear safety or continued safe plant operations.

5.0 REGULATORY ANALYSIS

5.1 No Significant Hazards Consideration PG&E has evaluated whether or not a significant hazards consideration is involved with the proposed amendments by focusing on the 3 standards set forth in 10 CFR 50.92, "Issuance of amendment," as discussed below:

1. Does the proposed change involve a significant increase in the probability or consequences of an accident previously evaluated?

Response: No.

The proposed change affects Technical Specification (TS) sections 3.8.4 "DC Sources - Operating," TS 3.8.5 'DC Sources - Shutdown," TS 3.8.6 "Battery Cell Parameters," and TS Administrative Controls section 5.5.

The proposed change restructures the TS for the direct current (DC) electrical power subsystem and adds new Conditions and Required 26

Enclosure 1 PG&E Letter DCL-03-084 Actions with increased Completion Times to address battery charger inoperability. Neither the DC electrical power subsystem nor associated battery chargers are initiators of any accident sequence analyzed in the Final Safety Analysis Report Update (FSARU). Operation in accordance with the proposed TS ensures that the DC electrical power subsystem is capable of performing its function as described in the FSARU. Therefore the mitigating functions supported by the DC electrical power subsystem will continue to provide the protection assumed by the analysis.

The relocation of preventive maintenance surveillances, and certain operating limits and actions to a newly-created, licensee-controlled TS 5.5.17, "Battery Monitoring and Maintenance Program," will not challenge the ability of the DC electrical power subsystem to perform its design function. The maintenance and monitoring required by current TS, which are based on industry standards, will continue to be performed. In addition, the DC electrical power subsystem is within the scope of 10 CFR 50.65, "Requirements for monitoring the effectiveness of maintenance at nuclear power plants," which will ensure the control of maintenance activities associated with the DC electrical power subsystem.

Therefore, the proposed change does not involve a significant increase in the probability or consequences of an accident previously evaluated.

2. Does the proposed change create the possibility of a new or different accident from any accident previously evaluated?

Response: No.

The proposed change does not involve any physical alteration of the units.

No new equipment is being introduced, and installed equipment is not being operated in a new or different manner. There are no setpoints at which protective or mitigating actions are initiated that are affected by the proposed changes. The operability of the DC electrical power subsystems in accordance with the proposed TS is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the plant. The proposed change will not alter the manner in which equipment operation is initiated, nor will the functional demands on credited equipment be changed. No alteration in the operating procedures, which ensure the unit remains within analyzed limits, is proposed, and no change is being made to procedures relied upon to respond to an off-normal event. As such, no new failure modes are being introduced. The proposed change does not alter assumptions made in the safety analyses.

27

Enclosure I PG&E Letter DCL-03-084 Therefore, the proposed change does not create the possibility of a new or different accident from any accident previously evaluated.

3. Does the proposed change involve a significant reduction in a margin of safety?

Response: No.

The proposed change will not adversely affect operation of plant equipment and will not result in a change to the setpoints at which protective actions are initiated. Sufficient DC capacity to support operation of mitigation equipment is ensured. The changes associated with the new battery maintenance and monitoring program will ensure that the station batteries are maintained in a highly reliable manner. The equipment fed by the DC electrical system will continue to provide adequate power to safety-related loads in accordance with analysis assumptions.

Therefore, the proposed change does not involve a significant reduction in a margin of safety.

Based on the above evaluation, PG&E concludes that the proposed amendments present no significant hazards consideration under the standards set forth in 10 CFR 50.92(c), and accordingly, a finding of 'no significant hazards consideration' is justified.

5.2 Applicable Regulatorv Requirements 10 CFR 50, Appendix A, General Design Criteria (GDC) 17, "Electric power systems" NRC Regulatory Guide 1.6, "Independence Between Redundant Standby (Onsite) Power Sources and Between Their Distribution Systems," March 10, 1971 NRC Regulatory Guide 1.32, "Criteria for Safety-Related Electric Power Systems for Nuclear Power Plants," Revision 2, February 1977 NRC Regulatory Guide 1.129, "Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Nuclear Power Plants," dated

[December 1974]

IEEE 308-[1971], "Standard Criteria for Class IE Power Systems for Nuclear Power Generating Stations," dated [August 1972]

28

Enclosure 1 PG&E Letter DCL-03-084 IEEE 450-1995, "IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications" Analysis The DCPP design of the Class 1E 125 V DC electrical power systems is in accordance with the requirements of GDC 17, NRC Regulatory Guide 1.6, and IEEE 308. Redundant power supplies and equipment satisfy GDC 17 for a single failure.

The overall system design including functional requirements, redundancy, capacity, and availability is in conformance with IEEE 308 criteria for Class 1E systems with the exception of battery performance discharge test intervals that are in accordance with IEEE 450-1995.

The battery charger supply capacity is in accordance with Regulatory Guide 1.32.

Periodic inspection and testing of the DC systems are performed to monitor the condition of the equipment to ensure reliable operation.

Visual inspections, liquid level, specific gravity, and cell voltage checks, and performance discharge tests are performed at regular intervals on each battery. Maintenance and testing procedures and criteria for replacement are in accordance with IEEE 450-1995, and Regulatory Guide 1.129. Visual checks and performance tests are also scheduled for the battery chargers.

The proposed changes to the DC electrical power systems specifications remain consistent with the applicable regulatory requirements by continuing to require full charger operability that is based on the margin afforded in the design capacity of the battery charger and to verify that the batteries are maintained within the established limitations to ensure that the batteries have sufficient capacity to perform the required duty cycle.

In conclusion, based on the considerations discussed above, (1) there is reasonable assurance that the health and safety of the public will not be endangered by operation in the proposed manner, (2) such activities will be conducted in compliance with the Commission's regulations, and (3) the issuance of the amendment will not be inimical to the common defense and security or to the health and safety of the public.

29

Enclosure 1 PG&E Letter DCL-03-084

6.0 ENVIRONMENTAL CONSIDERATION

PG&E has evaluated the proposed amendments and determined the proposed amendments do not involve (i) a significant hazards consideration, (ii) a significant change in the types or significant increase in the amounts of any effluent that may be released offsite, or (iii) a significant increase in individual or cumulative occupational radiation exposure. Accordingly, the proposed amendments meet the eligibility criterion for categorical exclusion set forth in 10 CFR 51.22(c)(9). Therefore, pursuant to 10 CFR 51.22(b), no environmental impact statement or environmental assessment need be prepared in connection with the proposed amendments.

7.0 REFERENCES

7.1 REFERENCES

1. Industry/Technical Specification Task Force (TSTF) Standard Technical Specification Change Traveler TSTF-360, Revision 1, 'DC Electrical Rewrite," dated November 3, 2000 (including Attachment 1, "Battery Primer For Nuclear Power Plants, 01/07/2000," Attachment 2, uKyle Floyd White Paper, A proposed Method for Selecting the Return to Service Current Limit for Safety-Related Batteries," and Attachment 3, "TSTF Response to NRC Comments on TSTF 360 Rev 0 dated 8/11/00").

2. Title 10 to the Code of Federal Regulations, Part 50 (10 CFR 50),

Appendix A, General Design Criteria (GDC) 17, "Electric power systems."

3. NUREG-1431, Revision 2, "Standard Technical Specifications, Westinghouse Plants," dated June 2001.

4. Regulatory Guide 1.6, "Independence Between Redundant Standby (Onsite) Power Sources and Between Their Distribution Systems,"

dated March 10, 1971.

5. Regulatory Guide 1.32, uCriteria for Safety-Related Electric Power Systems for Nuclear Power Plants," Revision 2, dated February 1977.

6. Regulatory Guide 1.129, "Maintenance, Testing, and Replacement of Large Lead Storage Batteries for Nuclear Power Plants," dated December 1974.

7. IEEE Standard 308-1971, "Standard Criteria for Class 1E Power Systems for Nuclear Power Generating Stations", dated August 1972.

8. IEEE Standard 450-1995, 'IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications," dated 1995.

9. NRC letter "Facility Operating License Amendment 6 to DPR-80 &

Amendment 4 to DPR-82/LAR 85-007," dated April 18, 1986.

30

Enclosure 1 PG&E Letter DCL-03-084

10. PG&E letter DCL-85-278, "License Amendment Request 85-07, Revision 1; Combined Technical Specification Changes, Specifications 3.8.2.1 and 3.8.2.2," dated August 27, 1985.

11. PG&E letter DCL-85-214, "Supplemental Information to License Amendment Request 85-07," dated June 14, 1985.

12. NRC letter "Conversion to Improved Technical Specification for Diablo Canyon Power Plant, Units 1 and 2 - Amendment No. 135 to Facility Operating License Nos. DPR-80 and DPR-82 (TAC Nos. M98984 and M98985)," dated May 28, 1999.

13. Nuclear Energy Institute letter to the NRC, "Forward Response to Battery TSTF Proposal," dated September 18, 2000.

14. NRC letter "Proposed Modifications to TSTF-360, Requirements for DC Sources," dated August 11, 2000.

15. Industry/Technical Specification Task Force Standard Technical Specification Change Traveler TSTF-363, 'Revise Topical Report references in ITS 5.6.5, COLR," approved April 13, 2000.

16. Exelon Generation Company, LLC, letter "Request for License Amendment for Technical Specifications - DC Electrical Power Systems," dated March, 8 2002.

17. NRC letter "Byron Station, Units 1 and 2, and Braidwood Station, Units I and 2 - Issuance of Amendments (TAC NOS. MB4450, MB4451, MB4448, AND MB4449)," dated September 19, 2002.

18. AmerGen Energy Company, LLC, letter "Clinton Power Station, Unit 1

- Request for Amendment to Technical Specifications Associated With DC Electrical Power," dated August 21, 2001.

19. NRC letter "Clinton Power Station, Unit 1 - Issuance of Amendment,"

dated February 15, 2002.

20. Title 10 to the Code of Federal Regulations, Part 65, Section 65 (10 CFR 50.65), "Requirements for Monitoring the Effectiveness of Maintenance at Nuclear Power Plants."

7.2 PRECEDENT The changes proposed in this LAR are consistent with similar changes previously requested by AmerGen Energy Company, LLC, for Clinton Power Station Unit 1, in the letter "Clinton Power Station, Unit 1 - Request for Amendment to Technical Specifications Associated With DC Electrical Power," dated August 21, 2001, and approved by the NRC in Amendment 142 to Facility Operating License No. NPF-62 for Clinton Power Station Unit 1, "Clinton Power Station, Unit 1 - Issuance of Amendment (TAC No. MB3071)," dated February 15, 2002.

Also, the changes proposed in this LAR are consistent with similar TSTF-360, Revision 1, changes previously requested by Exelon Generation Company, LLC, for Byron Station Units 1 and 2 and Braidwood 31

Enclosure 1 PG&E Letter DCL-03-084 Station Units I and 2 in the letter "Request for License Amendment for Technical Specifications - DC Electrical Power Systems," dated March 8, 2002, and approved by the NRC in Amendment No. 129 to Facility Operating License No. NPF-37 and Amendment No. 129 to Facility Operating License No. NPF-66 for the Byron Station, Unit Nos. 1 and 2, respectively, and Amendment No. 124 to Facility Operating License No. NPF-72 and Amendment No. 124 to Facility Operating License No. NPF-77 for the Braidwood Station, Unit Nos. 1 and 2, respectively, "Byron Station, Units 1 and 2, and Braidwood Station, Units 1 and 2 -

Issuance of Amendments (TAC NOS. MB4450, MB4451, MB4448, AND MB4449)," dated September 19, 2002.

This LAR requests to eliminate the "year" reference to the applicable IEEE 450 in the new TS [5.5.171 battery monitoring and maintenance program and maintain the year reference in the TS Bases. This exception to the TSTF-360, Revision 1,Westinghouse Owners Group TS markup inserts was approved for Byron Station Units I and 2 and Braidwood Station Units 1 and 2 in the NRC letter dated September 19, 2002.

32

Enclosure 2 PG&E Letter DCL-03-084 PROPOSED TECHNICAL SPECIFICATIONS (MARKED-UP)

Remove Page Insert Paae 3.8-18 3.8-18 3.8-19 3.8-19 3.8-20 3.8-20 3.8-21 3.8-21 3.8-22 3.8-22 3.8-23 3.8-23 3.8-24 3.8-23a 3.8-25 3.8-24 3.8-25 5.0-24 5.0-24 5.0-24a

DC Sources - Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources -Operating LCO 3.8.4 Three Class I E DC electrical power subsystems shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One battery charaer A.1 Restore battery terminal 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months inoperable. voltage to greater than or equal to the minimum established float voltage.

AND A.2 Verify battery float 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months currents 2 amps.

AND A.3 Restore battery charger 14 days to OPERABLE status.

B. One battery inoperable. B.1 Restore battery to 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months OPERABLE status.

CA. One DC electrical power CA. 1 Restore DC electrical 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months subsystem inoperable for power subsystem to reasons other than OPERABLE status.

Condition A or B.

D3-More than one full capacity DB.1 Restore the DC 14 days charger receiving power electrical power simultaneously from a subsystem to a single 480 V vital bus. configuration wherein each charger is powered from its associated 480 volt vital bus.

Any DC bus not receiving power fron ite ascociated AC electrical power distribution subsystem.

EC. Required Action and EC.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months Associated Completion Time not met. AND EC.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months I DIABLO CANYON - UNITS 1 & 2 3.8-18 Unit 1 - Amendment No. 435, TAB 3.8 - RO 20 Unit 2 - Amendment No. 435,

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.4.1 Verify battery terminal voltage is Ž 130 V on float 7 days caharge areater than or equal to the minimum established float voltage.

SR 3.8.4.2 Verify no visible corrosion at battery terminals and 92 days GonneGtows.

OR Verify battery connection resistance isj 150 x 100-ohm for c Gel! Gonnectione, 415 O 10n 4 ohm-for-inter- rFack Gonnrtioens, and 5 150 v Iehm terminal eonnections.

SR 3.8.1.3 Vcrify battery cells, cel! plates, and racks show no 24 months vissual indication of physical damage or abnormal deterioration that could degradc battery performance.

SR3.. ':visible Remove terminAal crrosion, Yeriflf battery cell 24 months to Gell and terminal connections are clean and tight, and are corated Wth anti ctrroionr mterial.

SR 3.8.4.5 Verify batter; connection resistanRe is

4150 i4- 24 months ohlm for inrter cll connections, 150 104 ohm fn-r inter rack connertions, and

150 404 -ohm for terminal connections.

SR 3.8.4.26 Verify each battery charger supplies 2 400 amps at 24 months

,+/-130 V oreater than or equal to the minimum established float voltage for 2 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

OR Verify each battery charger can recharge the battery to the fully charged state within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months while suoplvina the largest combined demands of the various continuous steady state loads, after a batterv discharge to the bounding desiqn basis event discharge state.

SR 3.8.4.37- O - --- - I

1. The modified performance discharge test in SR 3.8.6.64A 7 8 may be performed in lieu of the-sefPGe test-F# SR 3.8.4.3.7-

2. This Surveillance shall not be performed in MODE 1, 2, 3, or 4.

DIABLO CANYON - UNITS I & 2 3.8-19 Unit 1 - Amendment No. 435, TAB 3.8 - RO 21 Unit 2 - Amendment No. 435,

DC Sources - Operating 3.8.4 Verify battery capacity is adequate to supply, and 24 months maintain in OPERABLE status, the required emergency loads for the design duty cycle when subjected to a battery service test.

(continued)

DIABLO CANYON - UNITS I & 2 Unit 1 - Amendment No. 43a, TAB 3.8 - RO 22 Unit 2 - Amendment No. 435,

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS (continued)

SURVEILLANCE FREQUENCY

<< MOVE TO TS SECTION 3.8.6>>>

C%M Qf A Q kIP^TU ThiE Surveillance chai! not be peformed InFMODE 1, 2, 3, tec io Verify battery capacity or- s! 80% of the manufacturer's 60 months

.-. 1. Z whan rnfingm r.,boanford fn =- nerfn==mnni dhzrhnroc A_-A __

v -

- 1- - -

A_-A AND Wbt U d-JFMUUMi~UU p[UIIM Uib~fadf!L Itfb.

24 month; when bateiy shows degradation or has reached 85% of expected life with Gaparity e 10O%

of manufacturer's rating.

ANE 24 months when battery has reached 85% of the expected life with capacaito m10t0%f of manufacturer's DIABLO CANYON - UNITS I & 2 3.8-20 Unit I - Amendment No. 435, TAB 3.8 - RO 23 Unit 2 - Amendment No. 435,

DC Sources - Shutdown 3.8.5 There are no changes to this page. Included for information only.

I 3.8 ELECTRICAL POWER SYSTEMS 3.8.5 DC Sources-Shutdown LCO 3.8.5 The Class 1E DC electrical power subsystem shall be OPERABLE to support the DC electrical power distribution subsystem(s) required by LCO 3.8.10, "Distribution Systems-Shutdown."

APPLICABILITY: MODES 5 and 6, During movement of irradiated fuel assemblies.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One or more required DC A.1 Declare affected Immediately electrical power required features(s) subsystems inoperable. inoperable.

OR A.2.1 Suspend CORE Immediately ALTERATIONS.

AND A.2.2 Suspend movement of Immediately irradiated fuel assemblies.

AND A.2.3 Initiate action to suspend Immediately operations involving positive reactivity additions.

AND A.2.4 Initiate action to restore Immediately required DC electrical power subsystems to OPERABLE status.

DIABLO CANYON - UNITS 1 & 2 3.8-21 Unit 1 - Amendment No. 135 TAB 3.8 - RO 24 Unit 2 - Amendment No. 135

DC Sources - Shutdown 3.8.5 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.5.1 NOTE--

The following SRs are not required to be performed:

SR 3.8.4._6- and SR 3.8.4.37, and SR 3.8.4.8.

For DC sources required to be OPERABLE, the In accordance with following SRs are applicable: applicable SRs SR 3.8.4.1 SR 3.8.4.4 SR 3.8.4.7 SR 3.8.4.2 SR 3.8.4.5 SR 3.8.4.8 SR 3.8.4.3. SR 3-8.4.6 DIABLO CANYON - UNITS 1 & 2 3.8-22 Unit I - Amendment No. 435, TAB 3.8 - RO 25 Unit 2 - Amendment No. 45,

Battery Gel Parameters 3.8.6 3.8 ELECTRICAL POWER SYSTEMS 3.8.6 Battery Gell Parameters I LCO 3.8.6 Battery Gell parameters for the three Class 1E batteries shall be within the limits of Table 3.8.6 1.

APPLICABILITY: When associated DC electrical power subsystems are required to be OPERABLE.

ACTIONS NOTE Separate Condition entry is allowed for each battery.

CONDITION REQUIRED ACTION COMPLETION TIME A. One battery with one or A.1 Perform SR 3.8.4.1. 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months more battery cells with float voltage < 2.07 V. AND A.2 Perform SR 3.8.6.1. 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months AND A.3 Restore affected cell(s) 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months float voltage to 2 2.07 V.

B. One battery with float B.1 Perform SR 3.8.4.1. 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months current > 2 amps.

AND B.2 Restore battery float 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months current to *2 amps.

DIABLO CANYON - UNITS I & 2 3.8-23 Unit 1 - Amendment No. 435, TAB 3.8 - RO 26 Unit 2 - Amendment No. A35,

Battery GeN Parameters 3.8.6 NOTE-- -- -- NOTES---

Required Action C.2 shall be Required Actions C.1 and C.2 are completed if electrolyte level only applicable if electrolyte level was below the top of the plates. was below the top of the Dlates.

C. One battery with one or 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months C.1 Restore affected cell(s) more cells with electrolyte electrolyte level to above level less than minimum the top of the plates.

established design limits.

AND C.2 Verify no evidence of 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months leakage.

AND C.3 Restore affected cell(s) 31 days electrolyte level to greater than or equal to minimum established design limits.

D. One battery with pilot cell D.1 Restore battery pilot cell 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months electrolyte temperature less electrolyte temperature than minimum established to areater than or equal design limits. to minimum established design limits.

E. Two or more batteries with E.1 Restore batter 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months batterv parameters not parameters for one within limits. battery to within limits.

DIABLO CANYON - UNITS I & 2 TAB 3.8 - RO 27

Battery Ge# Parameters 3.8.6 A. One or more batterics with A.1 ple G4-*II I a.

Veif one or more battery ccl! alar~nI~a a,,I- ,nlMAn,f parameters not within voltage meet Thble Gategory A OFr B .iMitS. 3.8.6 1 Category C limits AND

\ ,__f

'.enRf

. L_.

bater,' ceH- 24 hows A ^ _ _

And

,. .. rar.p 4fS 1Srklfl AND 3.8.6 1 Category C kRmits. QF;Ge peF 7 dayr, thereafte ANS A.J Rescztor baztery cell parametere to Category A ^-A Iirnfe 0, 1; reW^e

^

(continued)

DIABLO CANYON - UNITS 1 & 2 Unit 1 - Amendment No. 43C, TAB 3.8 - RO 28 Unit 2 - Amendment No. 435,

Battery Gell Parameters 3.8.6 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME E. Required Action and F8.1 Declare associated Immediately I associated Completion battery inoperable.

Time of Condition A. B. C D, or E not met.

OR One oF meoe batteryies with one or more battery cells float voltage < 2.07 V and float current > 2 amps a'e:rage electrolyte-temperature of the reprscentati'.e Gells 4 600 F.

OR One or more batteries with one or more battery cell pramacnters not vvithin-Category C values.

SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.6.1 NOTE--

Not required to be met when battery terminal voltage is less than the minimum established float voltage of SR 3.8.4.1 Verify each battery float current is

2 amps. 7 days SR 3.8.6.2 Verify each battery pilot cell voltage is Ž 2.07 V. 31 days SR 3.8.6.3 Verify each battery connected cell electrolyte level is 31 days greater than or equal to minimum established design limits.

SR 3.8.6.4 Verify each battery pilot cell temperature is greater 31 days than or equal to minimum established design limits.

SR 3.8.6.5 Verify each battery connected cell voltage is 2 2.07 V. 92 days DIABLO CANYON - UNITS I & 2 3.8-24 Unit 1 - Amendment No. 435, TAB 3.8 - RO 29 Unit 2 - Amendment No. 435,

Battery Ge# Parameters 3.8.6

<< THIS SR MOVED FROM TS SECTION 3.8.4 >>

SR 3.8.6.64-8 t __

This Surveillance shall not be performed in MODE 1 Verify battery capacity is 2 80% of the manufacturer's 60 months rating when subiected to a performance discharge test or a modified performance discharge test. AND 24 months when battery shows degradation or has reached 85% of expected life with capacity < 100% of manufacturer's rating.

AND 24 months when battery has reached 85% of the expected life with caPacity 2 100% of manufacturer's rating.

SR 3.8.6.1 Vcrify battery cell parameters meet Table 3.8.6 1 7 days Category A limits.

SR 3.8.6.2 Verify battery cell parameters meet Table 3.8.6 1 92 days

__iegorymis ul~.

Once wi'.thin 7 daysc disceharge - 118 V AND Once within 7 days after a battery-overcharge > 145 V SR 3.8.6.3 Verify average electrolyte temperature of 02-days representative cells is ! 600 F.

DIABLO CANYON - UNITS I & 2 TAB 3.8 - RO 30

Battery GO Parameters 3.8.6 TL e O X: - I -r 11 Eagle 3.0.3 - tpaigc q OT-;"

Battery Cel! Parameters Requirements CATEGORY A: CATEGORY B: CATEGORY C:

PAR-AME15TER =LIMITS FOR EACH LIMITS FOR EACH ALLOWABLE DESIGNATED PILOT CONNECTED CELL LIMITS FOR EACH CELL CONNECTED CELL EleeItlyte Level Minimum level Minimum level Above top of plates, indiation mnark, and AndiGAti An m~ark, and adnot overflowing

!5 inch above !c % inch above maximum level maximum level indication mark~ ~ ndieation marfk(

leatVoltage -2.13 2.13 2.07V >

Specifi GMVW c iL.195 1.190 Not more than 0.020 below average of all AND connected cells AveFage ef all A-connected cells

> 1.200 Average-ofl rconnerctcd cells-(a) it is acceptable for the elertrolyte level to tempoaFaly inrGease above the epccified maximum durng equalizing charges provided it is not overfowing.

(b) Corrected for electrolyte temperature and level. Level correction is not required, howe Cr, wen battery rharging currtent is e 2 amps when oN float chae.-

(c) A batter: charging current of 4 2 amos when on float charge is arGeetable for meeting II snedcir.c grav.ity. limits~followingO a flaTTCr' renrhare T; a maximumn at 'ndays wanc-

, s J . .

at,.I.A-fl ;_ *eA

-- *A6 fl*& - -v-r S,-t-,f-*- CAAShrf~alt *~%- - M A-.4- A-

- - -g _ _

I - - - - - - - - -. - - - - -. - so - - - --w connected cell snail be measured pror to expiration o the 7 day allowance.

DIABLO CANYON - UNITS I & 2 3.8-25 Unit 1- Amendment No. 435, TAB 3.8-RO 31 Unit 2 - Amendment No. 435,

Programs and Manuals 5.5 5.5 Programs and Manuals 5.5.15 Safety Function Determination Program (SFDP) (continued)

b. A required system redundant to the system(s) in turn supported by the inoperable supported system is also inoperable; or

c. A required system redundant to the support system(s) for the supported systems (a) and (b) above is also inoperable.

The SFDP identifies where a loss of safety function exists. If a loss of safety function is determined to exist by this program, the appropriate Conditions and Required Actions of the LCO in which the loss of safety function exists are required to be entered.

5.5.16 Containment Leakaae Rate Testinq Program

a. A program shall be established to implement the leakage rate testing of the containment as required by 10 CFR 50.54(o) and 10 CFR 50, Appendix J, Option B, as modified by approved exemptions. This program shall be in accordance with the guidelines contained in Regulatory Guide 1.163, "Performance-Based Containment Leak-Test Program, dated September 1995." The ten-year interval between performance of the integrated leakage rate (Type A) test, beginning May 4, 1994, for Unit 1 and April 30, 1993, for Unit 2, has been extended to 15 years.

b. The peak calculated containment internal pressure for the design basis loss of coolant accident, P., is 47 psig.

c. The maximum allowable containment leakage rate, La, at Pa, shall be 0.10% of containment air weight per day.

d. Leakage rate acceptance criteria are:

1. Containment overall leakage rate acceptance criterion is

1.0 La. During the first unit startup following testing in accordance with this program, the leakage rate acceptance criteria are < 0.60 La for the Type B and Type C tests and < 0.75 L, for Type A tests;

2. Air lock testing acceptance criteria are:

a) Overall air lock leakage rate is

0.05 L, when tested at 2 Pa.

b) For each door, leakage rate is

0.01 L. when pressurized to Ž 10 psig.

e. The provisions of SR 3.0.2 do not apply to the test frequencies specified in the Containment Leakage Rate Testing Program.

f. The provisions of SR 3.0.3 are applicable to the Containment Leakage Rate Testing Program.

5.5.17 Battery Monitoring and Maintenance Program This Program provides for restoration and maintenance, based on the recommendations of IEEE Standard 450. "IEEE Recommended Practice for Maintenance, Testina. and Replacement of Vented Lead-Acid Batteries for Stationary Applications," or of the batterv manufacturer, of the following:

DIABLO CANYON - UNITS 1 & 2 5.0-24 Unit 1 - Amendment No. 435, 450, TAB 3.8 - RO 32 Unit2 - Amendment No.435, 450,

Programs and Manuals 5.5 5.5 Programs and Manuals (continued)

a. Actions to restore battery cells with float voltage < 2.13 V. and

b. Actions to equalize and test battery cells that had been discovered with electrolyte level below the top of the plates.

DIABLO CANYON - UNITS 1 & 2 Unit I - Amendment No.

TAB 3.8 - RO 33 Unit 2 - Amendment No.

Enclosure 3 PG&E Letter DCL-03-084 PROPOSED TECHNICAL SPECIFICATIONS PAGES (RETYPED)

DC Sources - Operating 3.8.4 3.8 ELECTRICAL POWER SYSTEMS 3.8.4 DC Sources - Operating LCO 3.8.4 Three Class 1E DC electrical power subsystems shall be OPERABLE.

APPLICABILITY: MODES 1, 2, 3, and 4.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One battery charger A.1 Restore battery terminal 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months inoperable. voltage to greater than or equal to the minimum established float voltage.

AND A.2 Verify battery float 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months current s 2 amps.

AND A.3 Restore battery charger 14 days to OPERABLE status.

B. One battery inoperable. B.1 Restore battery to 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months OPERABLE status.

C. One DC electrical power C.1 Restore DC electrical 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months subsystem inoperable for power subsystem to reasons other than OPERABLE status.

Condition A or B.

D. More than one full capacity D.1 Restore the DC 14 days charger receiving power electrical power simultaneously from a subsystem to a single 480 V vital bus. configuration wherein each charger is powered from its associated 480 volt vital bus.

E. Required Action and E.1 Be in MODE 3. 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months I Associated Completion Time not met AND E.2 Be in MODE 5. 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months I

DIABLO CANYON - UNITS 1 & 2 3.8-18 Unit I - Amendment No. 435, TAB3.8-RX 18 Unit 2 - Amendment No. 435,

DC Sources - Operating 3.8.4 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.4.1 Verify battery terminal voltage is greater than or 7 days equal to the minimum established float voltage.

SR 3.8.4.2 Verify each battery charger supplies 2 400 amps at greater than or equal to the minimum established float voltage for 2 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months .

OR 24 months 4

Verify each battery charger can recharge the battery to the fully charged state within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months while supplying the largest combined demands of the various continuous steady state loads, after a battery discharge to the bounding design basis event discharge state.

SR 3.8.4.3 - NOTES- I

1. The modified performance discharge test in SR 3.8.6.6 may be performed in lieu of SR 3.8.4.3.

2. This Surveillance shall not be performed in MODE 1, 2, 3, or4.

Verify battery capacity is adequate to supply, and 24 months maintain in OPERABLE status, the required emergency loads for the design duty cycle when subjected to a battery service test.

DIABLO CANYON - UNITS 1 & 2 3.8-19 Unit I - Amendment No. 145, TAB 3.8 - RX 19 Unit 2 - Amendment No. 435,

DC Sources - Operating 3.8.4 THIS PAGE NOT USED I DIABLO CANYON - UNITS 1 & 2 3.8-20 Unit I - Amendment No. 435, TAB3.8-RX 20 Unit 2- Amendment No. 435,

DC Sources - Shutdown 38AR5 I There are no changes to this page. Included for information only.

I 3.8 ELECTRICAL POWER SYSTEMS 3.8.5 DC Sources-Shutdown LCO 3.8.5 The Class 1E DC electrical power subsystem shall be OPERABLE to support the DC electrical power distribution subsystem(s) required by LCO 3.8.10, "Distribution Systems-Shutdown."

APPLICABILITY: MODES 5 and 6, During movement of irradiated fuel assemblies.

ACTIONS CONDITION REQUIRED ACTION COMPLETION TIME A. One or more required DC A.1 Declare affected Immediately electrical power required feature(s) subsystems inoperable. inoperable.

OR A.2.1 Suspend CORE Immediately ALTERATIONS.

AND A.2.2 Suspend movement of Immediately irradiated fuel assemblies.

AND A.2.3 Initiate action to suspend Immediately operations involving positive reactivity additions.

AND A.2.4 Initiate action to restore Immediately required DC electrical power subsystems to OPERABLE status.

DIABLO CANYON - UNITS 1 & 2 3.8-21 Unit 1 - Amendment No. 135 TAB 3.8 - RX 21 Unit 2 - Amendment No. 135

DC Sources - Shutdown 3.8.5 SURVEILLANCE REQUIREMENTS .

SURVEILLANCE FREQUENCY SR 3.8.5.1 - NOTE---

The following SRs are not required to be performed:

SR 3.8.4.2 and SR 3.8.4.3. I For DC sources required to be OPERABLE, the In accordance with following SRs are applicable: applicable SRs SR 3.8.4.1 SR 3.8.4.2 SR 3.8.4.3.

DIABLO CANYON - UNITS 1 & 2 3.8-22 Unit 1 - Amendment No. 435, TAB 3.8 -RX 22 Unit 2 - Amendment No. 435,

Battery Parameters 3.8.6 3.8 ELECTRICAL POWER SYSTEMS 3.8.6 Battery Parameters I LCO 3.8.6 Battery parameters for the three Class 1E batteries shall be within limits.

APPLICABILITY: When associated DC electrical power subsystems are required to be OPERABLE.

ACTIONS NOTE-Separate Condition entry is allowed for each battery.

CONDITION REQUIRED ACTION COMPLETION TIME A. One battery with one or A.1 Perform SR 3.8.4.1. 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months more battery cells with float voltage < 2.07 V. AND A.2 Perform SR 3.8.6.1. 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months AND A.3 Restore affected cell(s) 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months float voltage to 2 2.07 V.

B. One battery with float B.1 Perform SR 3.8.4.1. 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months current > 2 amps. AND B.2 Restore battery float 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months current to s 2 amps.

(continued)

DIABLO CANYON - UNITS 1 & 2 3.8-23 Unit 1 - Amendment No. 435, TAB 3.8 - RX 23 Unit 2 - Amendment No. 435,

Battery Parameters 3.8.6 ACTIONS (continued)

CONDITION REQUIRED ACTION COMPLETION TIME NOTE------ ----- NOTE-------

Required Action C.2 shall be Required Actions C.1 and C.2 are completed if electrolyte level only applicable if electrolyte level was below the top of the plates. was below the top of the plates.

C. One battery with one or C.1 Restore affected cell(s) 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months more cells with electrolyte electrolyte level to above level less than minimum the top of the plates.

established design limits.

AND C.2 Verify no evidence of 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months leakage.

AND C.3 Restore affected cell(s) 31 days electrolyte level to greater than or equal to minimum established design limits.

D. One battery with pilot cell D.1 Restore battery pilot cell 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months electrolyte temperature less electrolyte temperature than minimum established to greater than or equal design limits. to minimum established design limits.

E. Two or more batteries with E.1 Restore battery 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months battery parameters not parameters for one within limits. battery to within limits.

F. Required Action and F.1 Declare associated Immediately I associated Completion battery inoperable.

Time of Condition A, B, C, D, or E not met. I OR One battery with one or more battery cells float voltage < 2.07 V and float current > 2 amps.

DIABLO CANYON - UNITS 1 & 2 3.8-23a Unit 1 - Amendment No. 4A5, TAB 3.8 - RX 24 Unit 2 - Amendment No. 45,

Battery Parameters 3.8.6 SURVEILLANCE REQUIREMENTS SURVEILLANCE FREQUENCY SR 3.8.6.1 NOTE---

Not required to be met when battery terminal voltage is less than the minimum established float voltage of SR 3.8.4.1.

Verify each battery float current is s 2 amps. 7 days SR 3.8.6.2 Verify each battery pilot cell voltage is a 2.07 V. 31 days SR 3.8.6.3 Verify each battery connected cell electrolyte level is 31 days greater than or equal to minimum established design limits.

SR 3.8.6.4 Verify each battery pilot cell temperature is greater 31 days than or equal to minimum established design limits.

SR 3.8.6.5 Verify each battery connected cell voltage is 92 days 22.07V.

SR 3.8.6.6 ----- NOTE-- -

This Surveillance shall not be performed in MODE 1, 2,3, or4.

Verify battery capacity is > 80% of the manufacturers 60 months rating when subjected to a performance discharge AND test or a modified performance discharge test.

24 months when battery shows degradation or has reached 85% of expected life with capacity < 100%

of manufacturers rating.

AND 24 months when battery has reached 85% of the expected life with capacity

> 100% of manufacturers rating.

DIABLO CANYON - UNITS 1 & 2 3.8-24 Unit 1 - Amendment No. 435, TAB3.8-RX 25 Unit 2 - Amendment No. 435,

Battery Parameters 3.8.6 THIS PAGE NOT USED I DIABLO CANYON - UNITS 1 & 2 3.8-25 Unit 1 - Amendment No. 435, TAB 3.8 - RX 26 Unit 2 - Amendment No. 435,

Programs and Manuals 5.5 5.5 Programs and Manuals 5.5.15 Safety Function Determination Program (SFDP) (continued)

b. A required system redundant to the system(s) in turn supported by the inoperable supported system is also inoperable; or

c. A required system redundant to the support system(s) for the supported systems (a) and (b) above is also inoperable.

The SFDP identifies where a loss of safety function exists. If a loss of safety function is determined to exist by this program, the appropriate Conditions and Required Actions of the LCO in which the loss of safety function exists are required to be entered.

5.5.16 Containment Leakaae Rate Testing Program

a. A program shall be established to implement the leakage rate testing of the containment as required by 10 CFR 50.54(o) and 10 CFR 50, Appendix J, Option B, as modified by approved exemptions. This program shall be in accordance with the guidelines contained in Regulatory Guide 1.163, "Performance-Based Containment Leak-Test Program, dated September 1995." The ten-year interval between performance of the integrated leakage rate (Type A) test, beginning May 4, 1994, for Unit 1 and April 30, 1993, for Unit 2, has been extended to 15 years.

b. The peak calculated containment internal pressure for the design basis loss of coolant accident, Pa, is 47 psig.

c. The maximum allowable containment leakage rate, La, at Pa, shall be 0.10% of containment air weight per day.

d. Leakage rate acceptance criteria are:

1. Containment overall leakage rate acceptance criterion is

1.0 La. During the first unit startup following testing in accordance with this program, the leakage rate acceptance criteria are < 0.60 La for the Type B and Type C tests and

0.75 La for Type A tests;

2. Air lock testing acceptance criteria are:

a) Overall air lock leakage rate is

0.05 La when tested at > P.

b) For each door, leakage rate is

0.01 L when pressurized to > 10 psig.

e. The provisions of SR 3.0.2 do not apply to the test frequencies specified in the Containment Leakage Rate Testing Program.

f. The provisions of SR 3.0.3 are applicable to the Containment Leakage Rate Testing Program.

(continued)

DIABLO CANYON - UNITS 1 & 2 5.0-24 Unit 1 - Amendment No. 4-3, 140, TAB 5.0 - RX 26 Unit 2 - Amendment No. US, 450,

Programs and Manuals 5.5 5.5 Programs and Manuals (continued) 5.5.17 Battery Monitoring and Maintenance Program This Program provides for restoration and maintenance, based on the recommendations of IEEE Standard 450, IEEE Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications," or of the battery manufacturer, of the following:

a. Actions to restore battery cells with float voltage < 2.13 V, and

b. Actions to equalize and test battery cells that have been discovered with electrolyte level below the top of the plates.

DIABLO CANYON - UNITS I & 2 5.0-24a Unit 1 - Amendment No.

TAB 5.0 - RX 27 Unit 2 - Amendment No.

Enclosure 4 PG&E Letter DCL-03-084 TECHNICAL SPECIFICATIONS BASES (MARKED-UP)

(For information only)

Bases 3.8.4 Pages B 3.8-44 to B 3.8-51 Bases 3.8.5 Pages B 3.8-52 to B 3.8-54 Bases 3.8.6 Pages B 3.8-55 to B 3.8-60

DC Sources - Operating B 3.8.4 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.4 DC Sources-Operating BASES BACKGROUND The Class 1E DC electrical power system provides the AC emergency power system with control power. It also provides both motive and control power to selected safety related equipment and backup 120 VAC vital bus power (via inverters). As required by 10 CFR 50, Appendix A, GDC 17 (Ref. 1), the Class I E DC electrical power system is designed to have sufficient independence, redundancy, and testability to perform its safety functions, assuming a single failure.

The DC electrical power system also conforms to the recommend-ations of Regulatory Guide 1.6 (Ref. 2) and IEEE-308 (Ref. 3).

The 125 VDC electrical power system consists of three independent safety related Class 1E DC electrical power subsystems. Each subsystem consists of one 60-cell 125 VDC battery (Batteries 11(21),

12 (22), and 13 (23)), the dedicated battery charger and backup charger for each battery, and all the associated switchgear, control equipment, and interconnecting cabling. Although the three 125 VDC batteries consist of a 60-cell configuration. analysis is in place to fully support a 59-cell configuration (Ref. 11). Bases information in B 3.8.4.

B 3.8.5. and B 3.8.6 are written for a 60-cell battery and can be adiusted on a volts Per cell basis for a 59-cell battery.

There are two backup chargers for the three Class 1E DC subsystems.

One backup charger is shared between two Class 1E DC subsystems.

The other backup charger is dedicated to the third Class 1E DC subsystem. The backup chargers provide backup service in the event that the dedicated pFefewed battery charger is out of service. If the backup battery charger is substituted for one of the dedicated IefeFred battery chargers, then the requirements of independence and redundancy between subsystems are not maintained, and operation ins this condition is limited to 14 days by Condition DR.

During normal operation, the 125 VDC load is powered from the battery chargers with the batteries floating on the system. In case of loss of normal power to the battery charger, the DC load is automatically powered from the station batteries.

The DC electrical power subsystems provide the control power for its associated Class 1E AC power load group, 4.16 kV switchgear, and 480V load centers. The DC electrical power subsystems also provide DC electrical power to the inverters, which in turn are backup sources to power the 120 VAC vital buses.

The DC power distribution system is described in more detail in Bases for LCO 3.8.9, "Distribution System-Operating," and LCO 3.8.10, "Distribution Systems-Shutdown."

(continued)

B 3.8-44 Revision 1

DC Sources - Operating B 3.8.4 BASES BACKGROUND << Paragraph moved >>

(continued)

<< Paragraph moved >>

Each 125 VDC battery is separately housed in a ventilated room apart from its charger and distribution centers. Each subsystem is located in an area separated physically and electrically from the other subsystem to ensure that a single failure in one subsystem does not cause a failure in a redundant subsystem.

Each battery has adequate storage capacity to carry the required load continuously for at least 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months as meet the duty cvcle(s) discussed in the FSAR, Chapter 8 (Ref. 4). The battery is designed with additional capacity above that required by the design duty cycle to allow for temperature variations and other factors.

The batteries for the three DC electrical power subsystems are sized to produce required capacity at 80% of nameplate rating, corresponding to warranted capacity at end of life cycles and the 100% design demand. The voltage limit is 2.13 V per cGel, which corresponds to a total minimum voltage output of 128 V per battery. The criteria for kizing large lead storage batteries are defined in IEEE 485 (Ref. 5).

The minimum design voltage limit is 112.1 V for a 59-cell battery.

The batterv cells are of flooded lead acid construction with a nominal specific aravitv of 1.215. This specific gravity corresponds to an open circuit battery voltaae of apDroximatelv 125 V for a 60 cell battery (i.e..

cell voltage of 2.06 volts per cell (VDc)). The open circuit voltage is the voltage maintained when there is no charging or discharging. Once fully charged with its open circuit voltage 2 2.06 Vpc. the battery cell will maintain its capacity for 30 days without further charging per manufacturer's instructions. Optimal long term performance however, is obtained by maintaining a float voltage range of 2.20 to 2.25 VPC.

This provides adequate over-potential. which limits the formation of lead sulfate and self discharge. The float voltage range of 2.20 to 2.25 VPc corresponds to a total float voltage output range of 132.0 through 135.0 V for a 60 cell battery.

Each DC electrical power subsystem battery charger has ample power output capacity for the steady state operation of connected loads required during normal operation, while at the same time maintaining its battery bank fully charged. Each battery charger also has sufficient excess capacity to restore the battery from the design minimum charge to its fully charged state within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months while supplying normal steady state loads discussed in the FSAR, Chapter 8 (Ref. 4).

B 3.8-45 Revision 1

DC Sources - Operating B 3.8.4 The battery charger is normally in the float-charge mode. Float-charge is the condition in which the charger is supplving the connected loads and the batterv cells are receiving adequate current to optimallv charge the battery. This assures the internal losses of a battery are overcome and the battery is maintained in a fully charged state.

When desired, the charger can be placed in the equalize mode. The equalize mode is at a higher voltage than the float mode and charging current is correspondingly higher. The battery charger is operated in the equalize mode after a battery discharge or for routine maintenance.

Following a battery discharge, the battery recharge characteristic accepts current at the current limit of the battery charger (if the discharge was significant. e-q., following a batterv service test) until the batterv terminal voltage aDvroaches the charger voltage setpoint.

Charging current then reduces exponentially during the remainder of the recharge cycle. Lead-calcium batteries have recharge efficiencies of greater than 95%. so once at least 105% of the ampere-hours discharged have been returned, the batterv capacity would be restored to the same condition as it was Prior to the discharge. This can be monitored by direct observation of the exDonentially decayinq charging current or by evaluating the amp-hours discharged from the batterv and amp-hours returned to the battery.

APPLICABLE The initial conditions of Design Basis Accident (DBA) and transient SAFETY analyses in the FSAR, Chapter 6 (Ref. §6), and in the FSAR, Chapter ANALYSES 15 (Ref. g), assume that Engineered Safety Feature (ESF) systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the DGs, emergency auxiliaries, and control and switching during all MODES of operation.

The OPERABILITY of the DC sources is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining the DC sources OPERABLE during accident conditions in the event of:

a. An assumed loss of all offsite AC power or all onsite AC power; and

b. A worst case single failure.

The DC sources satisfy Criterion 3 of 10 CFR 50.36(c)(2)(ii).

(continued)

DC Sources - Operating B 3.8.4 BASES (continued)

LCO The DC electrical power subsystems, each subsystem consisting of one battery, battery charger for each battery and the corresponding control equipment and interconnecting cabling supplying power to the associated bus are required to be OPERABLE to ensure the availability of the required power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence (AO0) or a postulated DBA. Loss of any one DC electrical power subsystem does not prevent the minimum safety function from being performed (Ref. 4).

An OPERABLE DC electrical power subsystem requires the battery and its normal or backup charger to be operating and connected to the associated DC bus.

APPLICABILITY The DC electrical power sources are required to be OPERABLE in MODES 1, 2, 3, and 4 to ensure safe unit operation and to ensure that:

a. Acceptable fuel design limits and reactor coolant pressure boundary limits are not exceeded as a result of AOOs or abnormal transients; and

b. Adequate core cooling is provided, and containment integrity and other vital functions are maintained in the event of a postulated DBA.

The DC electrical power requirements for MODES 5 and 6 are addressed in the Bases for LCO 3.8.5, "DC Sources - Shutdown."

ACTIONS A.1. A.2. and A.3 Condition A represents one DC electrical power subsystem with one dedicated battery charger inoperable (e.a.. the voltage limit of SR 3.8.4.1 is not maintained). The ACTIONS provide a tiered response that focuses on returning the batter, to the fully charged state and restoring a fully qualified charger to OPERABLE status in a reasonable time period. Required Action A.1 requires that the terminal voltage be restored to greater than or egual to the minimum established float voltage within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months . This time provides for returning the dedicated charger to OPERABLE status or providing an alternate means of restoring the associated battery terminal voltage to greater than or equal to the minimum established float voltage. Restoring the battery terminal voltage to greater than or equal to the minimum established float voltage provides good assurance that, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , the battery will be restored to its fully charged condition (Required Action A.2) from any discharge that might have occurred due to the charger inoperability.

B 3.8-46 Revision 1

DC Sources - Operating B 3.8.4 ACTIONS A discharged battery having terminal voltage of at least the minimum established float voltage indicates that the battery is on the exponential charging current portion (the second Part) of its recharge cycle. The time to return a battery to its fully charged state under this condition is simply a function of the amount of the previous discharge and the recharge characteristic of the battery. Thus there is aood assurance of fully recharging the battery within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , avoiding a premature shutdown with its own attendant risk.

If established batterv terminal float voltage cannot be restored to greater than or equal to the minimum established float voltage within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , and the charger is not operating in the current-limitinq mode, a faulty charger is indicated. A faulty charger that is incapable of maintaining established batterv terminal float voltage does not provide assurance that it can revert to and operate Properly in the current limit mode that is necessary during the recovery period following a batterv discharge event that the DC system is designed for.

If the charger is operating in the current limit mode after 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months that is an indication that the batterv is partially discharged and its capacity margins will be reduced. The time to return the battery to its fully charged condition in this case is a function of the battery charger capacity. the amount of loads on the associated DC system, the amount of the previous discharge, and the recharge characteristic of the battery. The charge time can be extensive, and there is not adequate assurance that it can be recharged within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months (Required Action A.2).

Reguired Action A.2 reguires that the batter float current be verified as less than or egual to 2 amps. This indicates that, if the battery had been discharged as the result of the inoperable battery charger, it has now been fully recharged. If at the expiration of the 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months period the batterv float current is not less than or equal to 2 amps this indicates there may be additional battery problems and the battery must be declared inoperable in accordance with LCO 3.8.6 Required Action B.2.

Reguired Action A.3 limits the restoration time for the inoperable dedicated battery charger to 14 days. This action is applicable if an alternate means of restoring battery terminal voltage to greater than or equal to the minimum established float voltage has been used (e.a..

backup charger or non-Class 1E batterv charger). The 14 day completion time reflects a reasonable time to effect restoration of the dedicated battery charger to operable status.

B.I Condition B represents one DC electrical power subsystem with one battery inoperable. With one battery inoperable, the DC bus is being supplied by the associated OPERABLE battery charger. Any event that results in a loss of the associated 480 VAC vital bus supporting the normal batterv charger will also result in loss of or degraded DC to the

DC Sources - Operating B 3.8.4 ACTIONS associated DC electrical power subsystem. Recovery of the 480 VAC vital bus, especially if it is due to a loss of offsite power, will be hampered by the fact that many of the components necessary for the recovery (e.g., diesel generator control and field flash. AC load shed and diesel generator output circuit breakers. etc.) likely rely upon the battery. In addition, the energization transients of any DC loads that are beyond the capability of the battery charger and normally require the assistance of the batterv will not be able to be brought online. The 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months limit allows sufficient time to effect restoration of an inoperable battery given that the maiority of the conditions that lead to batterv inoperability (e.g.. loss of batterv charger. batterv cell voltage less than 2.07 V. etc.) are identified in Specifications 3.8.4. 3.8.5. and 3.8.6 together with additional specific completion times.

CA.1 Condition CA represents one Class 1E DC electrical power subsystem and associated ESF equipment with a loss of ability to completely respond to an event, and a potential loss of ability to remain energized during normal operation. It is, therefore, imperative that the operator's attention focus on stabilizing the unit, minimizing the potential for complete loss of DC power to the affected subsystem. The 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months limit is consistent with the allowed time for an inoperable DC distribution subsystem.

If one of the required DC electrical power subsystems is inoperable for reasons other than Condition A or B (e.g., inoperable battery, inoperable battery charger(s), or inoperable battery charger and associated inoperable battery), the remaining DC electrical power subsystems have the capacity to support a safe shutdown and to mitigate an accident condition. Since a subsequent worst case single failure could would, however, result in the loss of the minimum necessary DC electrical Power subsystems to mitigate a worst case accident.fone of the two remaining 125 VDC electrical power subsystems with attendant Iole of ESF functions, continued power operation should not exceed 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months . The 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months Completion Time is based on Regulatory Guide (continued)

DC Sources - Operating B 3.8.4 BASES ACTIONS CA. 1 (continued) 1.93 (Ref. Z8) and reflects a reasonable time to assess unit status as a function of the inoperable DC electrical power subsystem and, if the DC electrical power subsystem is not restored to OPERABLE status, to prepare to effect an orderly and safe unit shutdown.

DB.1 The design of the 125 VDC electrical power distribution system is such that a battery can have associated with it a dedicated full capacity charger powered from its associated 480 VAC vital bus or an backup afterate full capacity charger powered from another 480 VAC vital bus. Use of the backup full capacity charger results in more than one full capacity charger receiving Power simultaneously from a single 480 V vital bus and causes the requirements of independence and redundancy between subsystems to no longer be maintained. Thus IH4eweveF, operation in the latter condition or, with two chargers powered by the same vital bus is limited to 14 days.

EG.1 and EG.2 If the inoperable DC electrical power subsystem cannot be restored to OPERABLE status within the required Completion Time, the unit must be brought to a MODE in which the LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and to MODE 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging plant systems. The Completion Time to bring the unit to MODE 5 is consistent with the time required in Regulatory Guide 1.93 (Ref. 78).

B 3.8-47 Revision 1

DC Sources - Operating B 3.8.4 SURVEILLANCE SR 3.8.4.1 REQUIREMENTS The minimum established float voltage Provided by the battery manufacturer is 2.17 VPc or 130.2 V at the battery terminals for a 60-cell battern. This voltage maintains the battery plates in a condition that supports maintaining the arid life (expected to be approximately 20 years). Verifying battery terminal voltage while on float charge for the batteries helps to ensure the effectiveness of the battery chargers, which support charging system and the ability of the batteries to perform their intended function. Float charge is the condition in which the charger is supplying the continuous charge required to overcome the internal losses of a battery (or battery cell) and maintain the battery (or a battery cel!) in a fully charged state, while supplvina the continuous steady state loads of the associated DC electrical power subsystem. On float charge. batterv cells will receive adequate current to optimally charge the battery. The voltage requirements arc based on the nominal design voltage of the battery and are consistent with the anitial voltages assumed in the battery sizing calculations. The 7 day Frequency is consistent with manufacturer recommendations and IEEE-450 (Ref. 89).

SR 3-.8.4.

Visual inspection to detect corrosion of the battery cells and connections, or measurement of the resistance of each intcrcell, interrack, andWterinal connertion, proVides an indication of physical (continued)

DC Sources - Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.2 (Aontinued)

REQUIREMENTS damage or abnormal deterioration that could potentially degrade batter' perfremanre. The resistance of cel! to cell connerting cables does not have to be included in measurement of connection resistance.

The Sumrw'eillance Frequency for these inspertions, Which can detect conditions that can cause power losses due to resistance heating, is 82 days. This Frequency is considered acceptable based on operating experience related to detect;ing orrosio; trends.-

SR-3.8.1.

Visual inspection of the battery cells, cell plates, and battery racks provides an indication of physical damage or abnormal deterioration that could p^onteially degrade batters perfGFrman;Ge The preseRne of physical deterioration does not necessarily represent a failure of this SR, provded an evaluation determines that the physical damage or deterioration does not affect the OPERABILITY of the battery (its ability to perform its design function).

The 24 month Frequency for this SR is based on operational experience related to batter' integrity and physical degradatio-n.

SR 3.8.1.1 and SR 3.8.1.5 Visual inspection and resistanc measurements of intercel, interrack, and terminal connections provide an indication of physical damage or abnrmal deterioration that Gould indirate degraded batter,' condition.

The anticorrocion material is used to help ensure good electrical connections and to reduce terminal deterioration. The visual inspection for corrosior is not intended to require removal Of and iption under each terminal connection. The removal of visible corrosion is a pr eventive maintenance SR. The presence of visible orroesion does not necessarily represent a failure of this SR provided visible corrosion Mi removedduring performance rof SR 3.8141. The resistance of Gell to sell connecting cables does not have to be included in measurement of connection resistance for SR 3.8.1.5.

The Sumeillance Frequencies of 24 months are based on operational experience related to corrosion and connection resistance trends.

SR 3.8.4.26 This SR requires that each batter, charger be capable of supplying 400 amps at ! 130 V for > 4 houe. These requiremeRts are based on verifies the design capacity of the battery chargers (Ref. 4). According to Regulatory Guide 1.32 (Ref. 940), the battery charger supply is recommended required to be (continued) 8 3.8-48 Revision 1

DC Sources - Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.26 (continued)

REQUIREMENTS based on the largest combined demands of the various steady state loads and the charging capacity to restore the battery from the design minimum charge state to the fully charged state, irrespective of the status of the unit during these demand occurrences. The minimum required amperes and duration ensures that these requirements can be satisfied.

This SR provides two options. One option requires that each battery charger be capable of supplying 400 amps at the minimum established float voltage for greater than 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months . The ampere requirements are based on the output rating of the chargers. The voltage requirements are based on the charger voltage level after a response to a loss of AC power. The time period is sufficient for the charger temperature to have stabilized and to have been maintained for at least 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months .

The other option requires that each battery charger be capable of recharging the battery after a service test coincident with supplying the largest combined demands of the various continuous steady state loads (irrespective of the status of the plant during which these demands occur). This level of loading may not normally be available following the batterv service test and will need to be supplemented with additional loads. The duration for this test may be longer than the charger sizing criteria since the battery recharge is affected by float voltage, temperature. and the exponential decay in charging current.

The battery is recharged when the measured charging current is S 2 amps.

The Surveillance Frequency is acceptable, given the unit conditions required to perform the test and the other administrative controls existing to ensure adequate charger performance during these 24 month intervals. In addition, this Frequency is intended to be consistent with expected fuel cycle lengths.

SR 3.8.4.37l A battery service test is a special test of battery capability, as found, to satisfy the design requirements (battery duty cycle) of the DC electrical power system. The discharge rate and test length should correspond to the design duty cycle requirements as specified in FSAR Chapter 8.

(Ref. 4).

The Surveillance Frequency of 24 months is consistent with the intent of Regulatory Guide 1.32 (Ref. _40) and Regulatory Guide 1.129 (Ref.

014), which state that the battery service test should be performed during refueling operations or at some other outage.

This SR is modified by two Notes. Note 1 allows the performance of a modified performance discharge test in lieu of a service test.

B 3.8-49 Revision 1

DC Sources - Operating B 3.8.4 It may Thc modified performance discharge test is a simulated duty eyole-consisting of just two rates; for instance the one minute rate I published for the battery or the largest current load of the duty cycle, Exchange followed by the test rate employed for the performance test, both of paragraph which envelope the duty cycle of the service test. Since the ampere-hours removed by a fated one minute discharge represents a very I order and small portion of the battery capacity, the test rate can be changed to move both that for the performance test without compromising the results of the paragraphs to performance discharge test. The battery terminal voltage for the Bases for SR modified performance discharge test must should remain above the I 3.8.6.6 minimum battery terminal voltage specified in the battery service test (renumbered for the duration of time equal to that of the service test.

from SR A modified performance discharge test is a test of the battery capacity I 3.8.4.8) and its ability to provide a high rate, short duration load (usually the highest rate of the duty cycle). This will often confirm the battery's ability to meet the critical period of the load duty cycle, in addition to determining its (continued)

DC Sources - Operating B 3.8.4 BASES SURVEILLANCE SR 3.8.4.37 (continued)

REQUIREMENTS I percentage of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test. The modified performance discharge test and service test should be performed in accordance with IEEE-450 (Ref. 89). I The reason for Note 2 is that performing the Surveillance would perturb the electrical distribution system and challenge safety systems.

<< Move entire revised Bases for SR 3.8.4.8 to Bases for SR 3.8.6.6 >>

SR 3.8.6.6478 I

A battery performance discharge test is a test of constant current capacity of a battery, normally done in the as found condition, after having been in service, to detect any change in the capacity determined by the acceptance test. The test is intended to determine overall battery degradation due to age and usage.

A battery modiflied performance disccharge test is described in me Bases for SR 3.8.4.7. Either the battery performance discharge test or Insert two the modified performance discharge test is acceptable for satisfying SR 3.8.6.6478; however, only the modified performance discharge test paragraphs may be used to satisfy SR 3.8.4.8 while satisfying the battery service from Bases test requirements of SR 3.8.4.37 at the same time.

for SR 3.8.4.3 The acceptance criteria for this Surveillance are consistent with IEEE-450 (Ref. 38) and IEEE-485 (Ref. 5). These references I recommend that the battery be replaced if its capacity is below 80% of the manufacturer's rating. A capacity of 80% shows that the battery rate of deterioration is increasing, even if there is ample capacity to meet the load requirements. Furthermore, the batterv is sized to meet the assumed duty cycle loads when the batterv design canacity reaches this 80% limit.

The Surveillance Frequency for this test is normally 60 months. If the battery shows degradation, or if the battery has reached 85% of its expected service life and capacity is < 100% of the manufacturer's rating, the Surveillance Frequency is reduced to 24 months. However, if the battery shows no degradation but has reached 85% of its expected life, the Surveillance Frequency is only reduced to 24 months for batteries that retain capacity 2 100% of the manufacturer's rating.

Degradation is indicated, according to IEEE-450 (Ref. 29), when the battery capacity drops by more than 10% relative to its capacity on the previous performance test or when it is < 90% of the manufacturer's rating. The Surveillance Frequency basis is consistent with IEEE-450 (Ref. 29), except if accelerated testing is required, it will be performed at an 24-month frequency to coincide with a refueling outage.

This SR is modified by a Note. The reason for the Note is that performing the Surveillance would perturb the electrical distribution system and challenge safety systems.

B 3.8-50 (%Re¢)

DC Sources - Operating B 3.8.4 BASES (continued)

REFERENCES 1. 10 CFR 50, Appendix A, GDC 17.

2. Regulatory Guide 1.6, March 10, 1971.

3. IEEE Std. 308-1971.

4. FSAR, Chapter 8.

5. IEEE Std. 185 1978.

56. FSAR, Chapter 6.

67. FSAR, Chapter 15.

78. Regulatory Guide 1.93, December 1974.

89. IEEE Std. 450-1995.

9-. Regulatory Guide 1.32, February 1977.

10.4. Regulatory Guide 1.129, December 1974.

11. Electrical Desian Calculations 235A-DC thru 235F-DC.

B 3.8-51 Revision 1

DC Sources - Shutdown B 3.8.5 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.5 DC Sources-Shutdown BASES BACKGROUND A description of the DC sources is provided in the Bases for LCO 3.8.4, "DC Sources-Operati No I

.4 APPLICABLE The initial conditions c changes s Accident and transient analyses SAFETY in the FSAR, Chapter required Chapter 15 (Ref. 2), assume that ANALYSES Engineered Safety Fe are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the diesel generators, emergency auxiliaries, and control and switching during all MODES of operation.

The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and the requirements for the supported systems' OPERABILITY.

The OPERABILITY of the minimum DC electrical power sources during MODES 5 and 6 and during movement of irradiated fuel assemblies ensures that:

a. The unit can be maintained in the shutdown or refueling condition for extended periods;

b. Sufficient instrumentation and control capability is available for monitoring and maintaining the unit status; and

c. Adequate DC electrical power is provided to mitigate events postulated during shutdown, such as a fuel handling accident.

The DC sources satisfy Criterion 3 of 10 CFR 50.36(c)(2)(ii).

LCO The DC electrical power subsystems, each subsystem consisting of one battery, one battery charger per battery, and the corresponding control equipment and interconnecting class 1E cabling within the subsystem, are required to be OPERABLE to support required trains of the distribution systems required OPERABLE by LCO 3.8.10, "Distribution Systems-Shutdown." An OPERABLE subsystem consists of a DC bus connected to a battery with an OPERABLE battery charger which is fed from an OPERABLE AC vital bus (Ref B.3.8.10).

(continued)

B 3.8-52 Revision 1

DC Sources - Shutdown B 3.8.5 BASES LCO With administrative controls in place, DC buses may be cross-tied when (continued) a battery is taken out for r aintenaners rovided that the battery and the Class 1E cross-tie has suNo y and protection for its own loads and the cross-tie lo changes Iting circuit is not required to be single failure resistant. T required availability of sufficient DC electrical power sources t nit in a safe manner and to mitigate the consequence a F%0LA I, events during shutdown (e.g. fuel handling accidents).

APPLICABILITY The DC electrical power sources required to be OPERABLE in MODES 5 and 6, and during movement of irradiated fuel assemblies, provide assurance that:

a. Required features to provide adequate coolant inventory makeup are available for the irradiated fuel assemblies in the core;

b. Required features needed to mitigate a fuel handling accident are available;

c. Required features necessary to mitigate the effects of events that can lead to core damage during shutdown are available; and

d. Instrumentation and control capability is available for monitoring and maintaining the unit in a cold shutdown condition or refueling condition.

The DC electrical power requirements for MODES 1, 2, 3, and 4 are covered in LCO 3.8.4.

ACTIONS A.1, A.2.1, A.2.2, A.2.3, and A.2.4 One or more required DC electrical power subsystems may be inoperable provided that the remaining OPERABLE DC electrical power subsystem(s) support the DC electrical power distribution subsystem(s) required by LCO 3.8.10, "Distribution Systems - Shutdown," and are capable of supporting sufficient systems to allow continuation of CORE ALTERATIONS and fuel movement. By allowing the option to declare affected required features inoperable with the associated DC power source(s) inoperable, appropriate restrictions will be implemented in accordance with the affected required features LCO ACTIONS. A required feature is not affected if sufficient power is provided by the associated DC power source such that the feature is capable of performing its specified safety function(s). An engineering evaluation may be required to determine if a required feature is affected. For (continued) 3.8-53 B3.8-53 Revision I B Revision I

DC Sources - Shutdown B 3.8.5 BASES ACTIONS A.1, A.2.1, A.2.2, A.2.3, and A.2.4 (continued) example, see references 3 and 4. In many instances, this option may involve undesired administrative efforts. Therefore, the allowance for sufficiently conservative actions is made (i.e., to suspend CORE ALTERATIONS, movement of irradiated fuel assemblies, and operations involving positive reactivity additions). The Required Action to suspend positive reactivity additions does not preclude actions to maintain or increase reactor vessel inventory, provided the required SDM is maintained. Suspension of these activities shall not preclude completion of actions to establish a safe conservative condition. These actions minimize probability of the occurrence of postulated events. It is further required to immediately initiate action to restore the required DC electrical power subsystems and to continue this action until restoration is accomplished in order to provide the necessary DC electrical power to the unit safety systems.

The Completion Time of immediately is consistent with the required times for actions requiring prompt attention. The restoration of the required DC electrical power subsystems should be completed as quickly as possible in order to minimize the time during which the unit safety systems may be without sufficient power.

SURVEILLANCE SR 3.8.5.1 REQUIREMENTS SR 3.8.5.1 requires performance of all Surveillances required by SR 3.8.4.1 through SR 3.8.4.38. Therefore, see the corresponding Bases for LCO 3.8.4 for a discussion of each SR.

This SR is modified by a Note. The reason for the Note is to preclude requiring the OPERABLE DC sources from being discharged below their capability to provide the required power supply or otherwise rendered inoperable during the performance of an SR. This note does not except the requirement for the battery to be capable of performing the particular function, just that the capability need not be demonstrated while that source of power is being relied on to meet the LCO.

REFERENCES 1. FSAR, Chapter 6.

2. FSAR, Chapter 15.

3. DCM S-67, "125V/250V Direct Current System, Section 4.3.1."

4. AR A0456369 B 3.8-54 Revision 1

Battery Gel! Parameters B 3.8.6 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.6 Battery Ge# Parameters I

BASES BACKGROUND This LCO delineates the limits on battery float current as well as electrolyte temperature, level, and float voltage, and specific gravity for the DC electrica wer subsystem SeeFue batteries. A discussion of these batteries and their OPERABILITY requirements is provided in the Bases for LCO 3.8.4, "DC Sources - Operating," and LCO 3.8.5, "DC Sources - Shutdown." In addition to the limitations of this Specification.

the Battery Monitoring and Maintenance Proaram also implements a program specified in Specification 5.5.17 for monitoring various batter, parameters that is based on the recommendations of IEEE Standard 450. IEEE Recommended Practice For Maintenance, Testing, And Replacement Of Vented Lead-Acid Batteries For Stationary Applications" (Ref. 3).

The batterv cells are of flooded lead acid construction with a nominal specific gravity of 1.215. This specific gravity corresponds to an open circuit battery voltage of approximately 125 V for a 60 cell battery (i.e..

cell voltage of 2.06 volts per cell (Vpc)). The open circuit voltage is the voltage maintained when there is no charging or discharging. Once fully charged with Ks open circuit voltage Ž 2.06 Vpc. the battery cell will maintain its capacity for 30 days without further charging per manufacturing instructions. Optimal long term performance however, is obtained by maintaining a float voltage ranae of 2.20 to 2.25 Vpc.

This provides adequate over-potential which limits the formation of lead sulfate and self discharge. The float voltage range of 2.20 to 2.25 VpC corresponds to a total float voltage output ranae of 132.0 throuah 135.0 V for a 60 cell battery.

APPLICABLE The initial conditions of Design Basis Accident (DBA) and transient SAFETY analyses in the FSAR, Chapter 6 (Ref. 1) and Chapter 15 (Ref. 2),

ANALYSES assume Engineered Safety Feature systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the diesel generators, emergency auxiliaries, and control and switching during all MODES of operation.

The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining the required DC electrical power subsystem(s) OPERABLE during accident conditions, in the event of:

a. An assumed loss of all offsite AC power or all onsite AC power; and

b. A worst case single failure.

Battery eeU parameters satisfy the Criterion 3 of 10 CFR 50.36(c)(2)(ii). I B 3.8-55 Revision 1

Battery Cell Parameters

r. B 3.8.6 LCO Battery cell parameters must remain within acceptable limits to ensure I availability of the required DC power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence or a postulated DBA. Battery parameter Electrelyte limits I are conservatively established, allowing continued DC electrical system function even with Category A and B limits not met. Additional Preventive maintenance, testing, and monitoring performed in accordance with the Battery Monitorinq and Maintenance Program is conducted as specified in Specification 5.5.17.

APPLICABILITY The battery Ge# parameters are required solely for the support of the I associated DC electrical power subsystems. Therefore, battery OPERABILITY is only required when the DC power source is required to be OPERABLE. Refer to the Applicability discussion in Bases for LCO 3.8.4 and LCO 3.8.5.

(continued)

Battery GeU Parameters B 3.8.6 BASES (continued)

ACTIONS A. 1. A.2. and A.3 With one or more cells in one battery < 2.07 V. the battery cell is degraded. Within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months verification of the required battery charger OPERABILITY is made by monitoring the battery terminal voltage (SR 3.8.4.1) and of the overall battery state of charge by monitoring the battery float charge current (SR 3.8.6.1). This assures that there is still sufficient battery capacity to perform the intended function. Therefore, the affected battery is not required to be considered inoperable solely as a result of one or more cells < 2.07 V. and continued operation is permitted for a limited period up to 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

Since the Required Actions only specify "perform.' a failure of SR 3.8.4.1 or SR 3.8.6.1 acceptance criteria does not result in this Required Action not met. However, if one of the SRs is failed the appropriate Conditions(s). depending on the cause of the failure, is entered. If SR 3.8.6.1 is failed when in Condition A. then there is not assurance that there is still sufficient battery capacitv to perform the intended function. In this case the battery must be declared inoperable and Condition F must be entered.

B.1 and B.2 A battery with float current > 2 amps indicates that a partial discharge of the battery capacity has occurred. This may be due to a temporary loss of a battery charger or possibly due to one or more battery cells in a low voltage condition reflecting some loss of capacity. Within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months verification of the required battery charger OPERABILITY is made by monitoring the batterv terminal voltage. If the terminal voltage is found to be less than the minimum established float voltage there are two possibilities, the battery charger is inoperable or is operating in the current limit mode. Condition A addressed charger inoperability. If the charger is operating in the current limit mode after 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months that is an indication that the battery has been substantially discharged and likely cannot perform its required design functions. The time to return the battery to its fully charaed condition in this case is a function of the battery charger capacity, the amount of loads on the associated DC system. the amount of the previous discharge, and the recharge characteristic of the battery. The charae time can be extensive, and there is not adequate assurance that it can be recharged within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months (Required Action B.2). The battery must therefore be declared inoperable.

B 3.8-56 Revision I

Battery GeO Parameters B 3.8.6 If the float voltaae is found to be satisfactory but there are one or more battery cells with float voltage less than 2.07 V, the associated 'OR" statement in Condition F is applicable and the battery must be declared inoperable immediately. If float voltaae is satisfactory and there are no cells less than 2.07 V there is good assurance that, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , the battery will be restored to its fully charged condition (Required Action B.2) from any discharge that might have occurred due to temporary loss of the battery charger. A discharged battery with float voltage (the charger setpoint) across its terminals indicates that the battery is on the exponential charging current portion (the second part) of its recharge cycle. The time to return a battery to its fully charged state under this condition is simply a function of the amount of previous discharge and the recharme characteristic of the battery. Thus there is aood assurance of fully recharging the battery within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , avoiding a premature shutdown with its own attendant risk.

If the condition is due to one or more cells in a low voltage condition but still greater than 2.07 V and float voltaae is found to be satisfactory, this is not indication of a substantially discharged battery and 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months is a reasonable time prior to declaring the batterv inoperable.

Since Required Action B.1 only specifies Nperform," a failure of SR 3.8.4.1 acceptance criteria does not result in the Required Action not met. However, if SR 3.8.4.1 is failed, the appropriate Condition(s).

depending on the cause of the failure, is entered.

C.1, C.2, and C.3 With one battery with one or more cells electrolyte level above the top of the plates, but below the minimum established design limits, the battery still retains sufficient capacity to perform the intended function.

Therefore, the affected battery is not required to be considered inoperable solely as a result of electrolyte level not met. Within 31 days the minimum established design limits for electrolyte level must be re-established.

With electrolyte level below the top of the plates there is a potential for dryout and Plate degradation. Required Actions C.1 and C.2 address this potential (as well as provisions in Specification 5.5.17. Batterv Monitoring and Maintenance Program). They are modified by a note that indicates they are only applicable if electrolyte level is below the top of the plates. Within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months level is required to be restored to above the top of the plates. The Required Action C.2 requirement to verify that there is no leakaae by visual inspection and the Specification 5.5.17.b item to initiate action to equalize and test in accordance with manufacturer's recommendation are taken from Annex D of IEEE Standard 450 (Ref. 3). They are performed following the restoration of the electrolyte level to above the ton of the plates. Based on the results of the manufacturers recommended testing the battery may have to be declared inoperable and the affected cells(s) replaced.

Battery e Parameters B 3.8.6 D.1 With a battery with pilot cell temperature less than the minimum established design limits. 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months is allowed to restore the temperature to within limit. A low electrolyte temperature limits the current and power available. Since the battery is sized with margin, while battery capacity is degraded, sufficient capacitv exists to perform the intended function and the affected battery is not required to be considered inoperable solely as a result of the pilot cell temperature not met.

E.1 With two or more batteries in redundant DC electrical power subsystems with battery parameters not within limits there is not sufficient assurance that battery capacity has not been affected to the degree that the batteries can still perform there required function, given that redundant batteries are involved. With redundant batteries involved this Potential could result in total loss of function on multiple systems that rely upon the batteries. The longer completion times specified for battery parameters on non-redundant batteries not within limits are therefore not appropriate, and the parameters must be restored to within limits on at least one DC electrical Power subsystem within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months .

lAWth one or more cells inr-e bates- not within limits (i.e., Category A limits not met, Category B limitFnot met, or Category A and B limits not met) but within the Category C limits specified in Ta b In_.86 1 in the accm nig O, the batter,' is degraded but there is still sufficient capacity to perform the intended function.

Therefore, the affected batte r.,i not required to be consider-d inoperable solely as a result of Category A or B limits not met and operation is permitted for a limited period.

The pilot cell electro'te level and float voltage arc required to be verified to meet the Category C limits within 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months (Required Action T check-h; Gherk .wil ,Fvde a ici;ation of the status of the ind remainder of the batter, cells. One hour pro-ides timne to Verify' the elec~trolyte level and to cofrm& the float v.oltage of the pilot Geils. One hour is considered a reasonable amount of time to perform the required verification.

e'rifisation that the Category C limits are met (Required Action; A.2) provides assurance that during the time needed to restore the prwameters to the CategoF' A and B limits, the batter, is still rapable of performiRg its intended funrtion. A period of 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months is allowed to complete the initial verification because specific gravity measurements must be obtained for each connected cell. Taking into consideration both the time required to perform the rerequed verification and the assurance that the battery cell parameters are not severely degraded, this time ionsidered reasonable. The verification is repeated at 7 day intervals until the parameters are restored to Category A or B limits. This periodic verification is eonsistent with the normal r-equency of pilot cell Sur.eillaGees.

Battery Cel Parameters B 3.8.6 Continued operation is only permitted for 31 days before battery eel!

parameters must be restored to within Category A and B limits. With the onRsideration that, while bater, rapacity ior. degraded, sufficient capacity exists to peform the intended function and to allow time to fully restore the batter' cell parameters to normal limits, this time is acceptable prior to declaring the battery inoperable.

FSb. I With one oF meoe battery batteres with anvyone or more battery Gel parameters outside the Category C limit for any connected cell allowances of the Required Actions for Condition A, B. C. D. or E, sufficient capacity to supply the maximum expected load requirement is not assured and the corresponding DC battery eletrical power subsystem must be declared inoperable. Additionally, discovering a battery with one or more battery cells float voltage less than 2.07 V and float current greater than 2 amps indicates that the battery capacity may not be sufficient to perform the intended functions. The battery must therefore be declared inoperable immediately. ether poteRtially extreme conditions, such as not completing the Required Actions of Condition A vYithin the rFequired BASES ACTIONS B-. (centinued)

Completion Time or average elerolyte tempeature ofrepresentative cells less than 60°F, are also cause for immediately declaring the associated DC electrical power subsystem inoperable.

SURVEILLANCE SR 3.8.6.1 REQUIREMENTS Verifying battery float current while on float charge is used to determine the state of charge of the battery. Float charge is the condition in which the charger is supplying the continuous charge required to overcome the internal losses of a battery and maintain the battery in a charged state. The float current requirements are based on the float current indicative of a charged battery. Use of float current to determine the state of charge of the battery is consistent with IEEE-450 (Ref. 3). The 7 day frequency is consistent with IEEE-450 (Ref. 3).

This SR is modified by a Note that states the float current requirement is not required to be met when battery terminal voltage is less than the minimum established float voltage of SR 3.8.4.1. When this float voltage is not maintained the Required Actions of LCO 3.8.4 Action A are being taken, which provide the necessary and appropriate verifications of the battery condition. Furthermore, the float current limit of 2 amps is established based on the nominal float voltage value and is not directly applicable when this voltage is not maintained.

This SR Yeifies that Categor' A batter, cell parameters on a 7 day frequency are consistent with IEEE 450 (Ref. 3), which recommends regular battery inspections (at least one per month) including voltage, epecific gravity, and elertrolyte temperature of pilet cells.

B 3.8-57 Revision I

Battery Ge# Parameters B 3.8.6 SR 3.8.6.2 and 3.8.6.5 ODtimal lona term battery Performance is obtained by maintaining a float voltage greater than or equal to the minimum established float voltage provided by the battery manufacturer, which corresponds to 130.2 V for 60 cells at the battery terminals, or 2.17 Vpc. This provides adequate over-Dotential. which limits the formation of lead sulfate and self discharge, which could eventually render the battery inoperable.

Float voltages in the ranae of less than 2.13 VpC. but greater than 2.07 Voc. are addressed in Specification 5.5.17. SRs 3.8.6.2 and 3.8.6.5 require verification that the cell float voltages are equal to or greater than the short term absolute minimum voltage of 2.07 V. The Frequency for cell voltage verification every 31 days for Pilot cell and 92 davs for each connected cell is consistent with IEEE-450 (Ref. 3).

The uarterly inspcrtion of spcrific gravity is more GenseRwative than IEEE 450 (Ref. 3), which requires a yearly frequency. In addition, within 7 days of a batter; discharge - 118 V or a battery overcharge

> 145 V, the battery must be demonstrated to meet Category B limits.

Transients, such as motor starting transients, which may momentarily

_ause baitter' voltage to drop to 11H8 V, d Rnot constitute a bafter,-

discharge provided the battery terminal voltage and float current return to pre transwent values. This inspection is also cnsistent vvith IEEE a50 (Ref. 3), which recommends speciat inspecrtions felloi.ng a severe discharge or overcharge, to ensure that no significant degradatieon Ef the batter, occur-s as a consequence of such dischar-ge or evercharge.

SR 3.8.6.3 The electrolyte level minimum established design limit is the manufacturer minimum level indication mark on the battery case. The limit specified for electrolyte level ensures that the plates suffer no Physical damage and maintains adequate electron transfer capability.

The Freauencv is consistent with IEEE-450 (Ref. 3).

This Surveillance verification that the average temperature of representative cells is 602F, is consistent with a recommendation of lEEE 450 (Ref. 3), that states that the temperature of electrolytes in 10 connected cells should be determined on a quarterly basis.

Lower than nomal temperatures art to inhibit or reduce baier,'

capacity. This SR ensures that the operating temperatures remain vvithin an acreptable operatingrange. This limit is based on batter,'

s:iZing calculations.

SR 3.8.6.4 This Surveillance verifies that the pilot cell temperature is greater than or equal to the minimum established design limit (i.e. 60 0F). Pilot cell electrolyte temperature is maintained above this temperature to assure the battery can provide the required current and voltage to meet the design requirements. Temperatures lower than assumed in batterv sizing calculations act to inhibit or reduce battery capacity. The Frequency is consistent with IEEE-450 (Ref. 3).

Battery CeO Parameters B 3.8.6 SR 3.8.6.6 A battery performance discharge test is a test of constant current capacity of a battery. normally done in the as found condition, after having been in service, to detect any change in the capacity determined by the acceptance test. The test is intended to determine overall batterv degradation due to age and usage.

Either the battery performance discharge test or the modified performance discharge test is acceptable for satisfying SR 3.8.6.6:

however. only the modified performance discharge test may be used to satisfy the battery service test requirements of SR 3.8.4.3.

A modified performance discharge test is a test of the batterv capacity and its ability to provide a high rate, short duration load (usually the highest rate of the duty cycle). This will often confirm the battery's ability to meet the critical period of the load duty cycle, in addition to determining its percentage of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test. The modified performance discharge test and service test should be performed in accordance with IEEE-450 (Ref. 3).

It may consist of iust two rates: for instance the one minute rate published for the batterv or the largest current load of the duty cycle, followed by the test rate employed for the performance test, both of which envelope the duty cycle of the service test. Since the ampere-hours removed by a one minute discharge represents a very small portion of the batterv capacity, the test rate can be changed to that for the performance test without compromising the results of the performance discharge test. The battery terminal voltage for the modified performance discharge test must remain above the minimum battery terminal voltage specified in the batterv service test for the duration of time equal to that of the service test.

The acceptance criteria for this Surveillance are consistent with IEEE-450 (Ref. 3) and IEEE-485 (Ref. 5). These references recommend that the battery be replaced if its canacity is below 80% of the manufacturers rating. A capacity of 80% shows that the battery rate of deterioration is increasing, even if there is ample capacity to meet the load requirements. Furthermore, the battery is sized to meet the assumed duty cycle loads when the battery design capacity reaches this 80% limit.

Battery GeO Parameters B 3.8.6 The Surveillance Frequencv for this test is normally 60 months. If the battery shows degradation. or if the battery has reached 85% of its expected service life and capacity is < 100% of the manufacturer's rating, the Surveillance Frequency is reduced to 24 months. However, if the battern shows no degradation but has reached 85% of its expected life, the Surveillance Frequency is only reduced to 24 months for batteries that retain capacity 2 100% of the manufacturer's rating.

Degradation is indicated, according to IEEE-450 (Ref. 3). when the battery capacitv drops by more than 10% relative to its capacity on the previous performance test or when it is < 90% of the manufacturers rating. The Surveillance Frequency basis is consistent with IEEE-450 (Ref. 3). except if accelerated testing is required, it will be performed at a 24-month freauencv to coincide with a refueling outage.

This SR is modified by a Note. The reason for the Note is that performing the Surveillance would perturb the electrical distribution system and challenge safety systems.

(continued)

Battery GO Parameters B 3.8.6 BASES SURVEILLANCE Table 3.8.6 4 REQUIREMENTS (continued) This table delineates the limits on clectrol',te level, float voltage, and specific gravity for three different categories. The mcaning of each Gategory is disrussed betow'.

Category A defines the normal parameter limit for the designated pilot ceil in each batter;. The cel selected as the pilot cell is that whose temperature, oltage, and elecptrortc erspifi grfavity approximate the

.tateof charnr of the entire hbttmr' The Category A limits specified for electrolyte level are based on mainfacrcerr recommendations and are onrsisteRt vWith the guidance in IEEE 150 (Ref. 3), with the extra 1M1inch allowance above the high water level indication for operating margin to account forF tcmperaturcs and charge efects. In addition to this allowance, footnote a to Table 3.8.6 1 permits the electrolyte level to be above the specified maximum level drwing equali;z;g charge, provided It is not ovcflowing. These limits ensure that the plates suff-er no physical damage, an;d that adequate elertroR transfer capabilityis maiRtained in the event of transient conditions. IEEE 150 (Ref. 3) recommends that electrolyte level readings should be made only after the battery has been at float Gharge for at least 72 houos.

The Categor; A limit specified for float voltage is 2.1 3 V per cell.

This value is based on the recommendations of IEEE 450 (Ref. 3),

which states that prolonged operation of cells 4 2.13 V can reduce the life expecancy of Glls.

The Category A limit specified for specific gravity for each pilot cell i!

Ž 1.195 (0.015 below the manufacturer minimum fully charged specific grav;ty Or a bater,' GhargiRg current that had stabilized at a lew value).

This value is characteristic of a charged cell with adequate capacity.

According to IEEE 450 (Ref. 3), the specific gravity readings are based on a temperature of 77°F (25 0C).

The specific gravity readings are corrected for actual electrolyte temperature and level. The correction factors are provided by the battery manufacturer. The specific gravity of the electrolyte in a cell increases Ywith a les ofwatr dutlectrolsis or evaporation.

Category B defines the minimum normal parameter limits for each connected cell. The term "connected cell" excludes any battery cell that may be jumpered out.

(continued)

B 3.8-58 Revision 1

Battery Cel Parameters B3.8.6 BASES SURVEILLANCE Table 3.8.6 1 (continued)

REQUIREMENTS Thc Category B limits spcrified for electrolyte level and float voltage arc thoe rsamc as thoec specified for Categor; A and have becn discussed above. The Category B limit is corrected for average electrolyte temperaturc. The Category B limit specified for specific gravity for each cRnneted cell i sŽ 190 (0.020 below the manufacturer minimum fully charged specific gravity) with the average of all connected cells 1.200 (0.010 below the manufacturer minimum fully charged specific gravity). These values are based on manufacturcrs recommendations. The minimum specific gravity value required for each cell ensures that the effects of a highly charged or newly installed cGel will not mask overall degradation of the batery.

Category C defines the minimum allowable limits for each connected ell. These values, although reduced, proevide assurance that sufficient capacity exists to perfaom the intended function and maintain a of safety. any battery parameter is outside the Category C mhen limits, the assuranee of sufficeRt capacity dei bove o lnger exists, and the battery must be declared inoperable.

The Category C limits specified for electrolyte level (above the top of the plates and not overflowing) ensure that the plates SOW ufer physical damage and maintain adequate electron transfer capability.

The Category C limit for float voltage is based on IEEE 150 (Ref. 3),

which states that a cell voltage of 2.07 V or below, under float conditions and not caused by elevated temperature of the cell, ndircates intemal cell poblems and ma" require cell replacement.

The Categoe,' C limit of avecage specific. gFavity Ž!1.190 is based on manufacturer recommendations (0.020 below the manufacturer reommended mi;nimum fully charged speoifG gravity). in addition to that limit, it is required that the specific gravity for each connected cell must be Ro less than; 0.020 below the ave rage of all connected Gells.

This limit ensures that the effec of a highly chaFged Or new cell does not mask overall degradation of the battery.

The footnotes to Table 3.8.6 1 arc applicable to Catego,' A, B, and C specific gravity. Footnote (b)to Table 3.8.6 1 requires the above mentionedrsemedier for electrhole level and teper-aturv with the exception that level correction is not required when battery charging current is - 2 amps on float charge. This current provides, in general, an indlication of a batter,' in a charged condition.

(continued)

B3.859 Revision I

Battery GeO Parameters B 3.8.6 BASES SURVEILLANCE Tablc 3.8.6 1 (continued)

REQUIREMENTS Because of specific graVity gradientc that arc pr-oducd during the Fechargng percecs, delays of sevcral day's may ecusr wnile waiting for the specific gravity to stabilize. A stabilized charger current ij an acceptable altemative to specific gravity measurement for determining the state of charge. This phenomneno-n is discussed ;50 in IEEE (Ref. 3). Footnote (c) to Table 3.8.6 1 allows the float charge current to be used as an altcmate to specific graVity for Up to 7 days fellowing a battery recharge. Within 7 days, each connected cell's specific gravity must be measured to confirm the state of charge. Following a mn;roF batter' recharge (such as equal char-ge that doers not follow^r a deep discharge) specific gravity gradients are not significant, and confirming measurements may be made in less than 7 days.

REFERENCES 1. FSAR, Chapter 6.

2. FSAR, Chapter 15.

3. IEEE Std. 450-1995.

4. FSAR, Chapter 8

5. IEEE Std. 485-19834.

I B 3.8-60 Revision I

Enclosure 5 PG&E Letter DCL-03-084 TECHNICAL SPECIFICATIONS BASES PAGES (RETYPED)

(For information only)

DC Sources - Operating B 3.8.4 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.4 DC Sources-Operating BASES BACKGROUND The Class 1E DC electrical power system provides the AC emergency power system with control power. It also provides both motive and control power to selected safety related equipment and backup 120 VAC vital bus power (via inverters). As required by 10 CFR 50, Appendix A, GDC 17 (Ref. 1), the Class 1E DC electrical power system is designed to have sufficient independence, redundancy, and testability to perform its safety functions, assuming a single failure.

The DC electrical power system also conforms to the recommend-ations of Regulatory Guide 1.6 (Ref. 2) and IEEE-308 (Ref. 3).

The 125 VDC electrical power system consists of three independent safety related Class 1E DC electrical power subsystems. Each subsystem consists of one 60-cell 125 VDC battery (Batteries 11 (21),

12 (22), and 13 (23)), the dedicated battery charger and backup charger for each battery, and all the associated switchgear, control equipment, and interconnecting cabling. Although the three 125 VDC batteries consist of a 60-cell configuration, analysis is in place to fully support a 59-cell configuration (Ref. 11). Bases information in B 3.8.4, B 3.8.5, and B 3.8.6 are written for a 60-cell battery and can be adjusted on a volts per cell basis for a 59-cell battery.

There are two backup chargers for the three Class 1E DC subsystems.

One backup charger is shared between two Class 1E DC subsystems.

The other backup charger is dedicated to the third Class 1E DC subsystem. The backup chargers provide backup service in the event that the dedicated battery charger is out of service. If the backup battery charger is substituted for one of the dedicated battery chargers, then the requirements of independence and redundancy between subsystems are not maintained, and operation in this condition is limited to 14 days by Condition D.

During normal operation, the 125 VDC load is powered from the battery chargers with the batteries floating on the system. In case of loss of normal power to the battery charger, the DC load is automatically powered from the station batteries.

The DC electrical power subsystems provide the control power for its associated Class 1E AC power load group, 4.16 kV switchgear, and 480V load centers. The DC electrical power subsystems also provide DC electrical power to the inverters, which in turn are backup sources to power the 120 VAC vital buses.

The DC power distribution system is described in more detail in Bases for LCO 3.8.9, "Distribution System-Operating," and LCO 3.8.10, "Distribution Systems-Shutdown."

(continued)

DIABLO CANYON - UNITS I & 2 B 3.8-44 Revision 1 TABB3-8.DOC - RlA 44

DC Sources - Operating B 3.8.4 BASES BACKGROUND Each 125 VDC battery is separately housed in a ventilated room apart (continued) from its charger and distribution centers. Each subsystem is located in an area separated physically and electrically from the other subsystem to ensure that a single failure in one subsystem does not cause a failure in a redundant subsystem.

Each battery has adequate storage capacity to meet the duty cycle(s) discussed in the FSAR, Chapter 8 (Ref. 4). The battery is designed with additional capacity above that required by the design duty cycle to allow for temperature variations and other factors.

The batteries for the three DC electrical power subsystems are sized to produce required capacity at 80% of nameplate rating, corresponding to warranted capacity at end of life cycles and the 100% design demand. The minimum design voltage limit is 112.1 V for a 59-cell battery.

The battery cells are of flooded lead acid construction with a nominal specific gravity of 1.215. This specific gravity corresponds to an open circuit battery voltage of approximately 125 V for a 60 cell battery (i.e.,

cell voltage of 2.06 volts per cell (Vpc)). The open circuit voltage is the voltage maintained when there is no charging or discharging. Once fully charged with its open circuit voltage Ž 2.06 Vpc, the battery cell will maintain its capacity for 30 days without further charging per manufacturer's instructions. Optimal long term performance however, is obtained by maintaining a float voltage range of 2.20 to 2.25 Vpc.

This provides adequate over-potential, which limits the formation of lead sulfate and self discharge. The float voltage range of 2.20 to 2.25 Vpc corresponds to a total float voltage output range of 132.0 through 135.0 V for a 60 cell battery.

Each DC electrical power subsystem battery charger has ample power output capacity for the steady state operation of connected loads required during normal operation, while at the same time maintaining its battery bank fully charged. Each battery charger also has sufficient excess capacity to restore the battery from the design minimum charge to its fully charged state within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months while supplying normal steady state loads discussed in the FSAR, Chapter 8 (Ref. 4).

The battery charger is normally in the float-charge mode. Float-charge is the condition in which the charger is supplying the connected loads and the battery cells are receiving adequate current to optimally charge the battery. This assures the internal losses of a battery are overcome and the battery is maintained in a fully charged state.

(continued)

DIABLO CANYON - UNITS 1 & 2 B 3.8-45 Revision I TABB3-8.DOC - RIA 45

DC Sources - Operating B 3.8.4 BASES BACKGROUND When desired, the charger can be placed in the equalize mode. The (continued) equalize mode is at a higher voltage than the float mode and charging current is correspondingly higher. The battery charger is operated in the equalize mode after a battery discharge or for routine maintenance.

Following a battery discharge, the battery recharge characteristic accepts current at the current limit of the battery charger (if the discharge was significant, e.g., following a battery service test) until the battery terminal voltage approaches the charger voltage setpoint.

Charging current then reduces exponentially during the remainder of the recharge cycle. Lead-calcium batteries have recharge efficiencies of greater than 95%, so once at least 105% of the ampere-hours discharged have been returned, the battery capacity would be restored to the same condition as it was prior to the discharge. This can be monitored by direct observation of the exponentially decaying charging current or by evaluating the amp-hours discharged from the battery and amp-hours returned to the battery.

APPLICABLE The initial conditions of Design Basis Accident (DBA) and transient SAFETY analyses in the FSAR, Chapter 6 (Ref. 5), and in the FSAR, Chapter 15 ANALYSES (Ref. 6), assume that Engineered Safety Feature (ESF) systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the DGs, emergency auxiliaries, and control and switching during all MODES of operation.

The OPERABILITY of the DC sources is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining the DC sources OPERABLE during accident conditions in the event of:

a. An assumed loss of all offsite AC power or all onsite AC power; and

b. A worst case single failure.

The DC sources satisfy Criterion 3 of 10 CFR 50.36(c)(2)(ii).

(continued)

DIABLO CANYON - UNITS I & 2 B 3.8-46 Revision I TABB3-8.DOC - RlA 46

DC Sources - Operating B 3.8.4 BASES (continued)

LCO The DC electrical power subsystems, each subsystem consisting of one battery, battery charger for each battery and the corresponding control equipment and interconnecting cabling supplying power to the associated bus are required to be OPERABLE to ensure the availability of the required power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence (AO0) or a postulated DBA. Loss of any one DC electrical power subsystem does not prevent the minimum safety function from being performed (Ref. 4).

An OPERABLE DC electrical power subsystem requires the battery and its normal or backup charger to be operating and connected to the associated DC bus.

APPLICABILITY The DC electrical power sources are required to be OPERABLE in MODES 1, 2, 3, and 4 to ensure safe unit operation and to ensure that:

a. Acceptable fuel design limits and reactor coolant pressure boundary limits are not exceeded as a result of AOOs or abnormal transients; and

b. Adequate core cooling is provided, and containment integrity and other vital functions are maintained in the event of a postulated DBA.

The DC electrical power requirements for MODES 5 and 6 are addressed in the Bases for LCO 3.8.5, "DC Sources - Shutdown."

ACTIONS A.1, A.2, and A.3 Condition A represents one DC electrical power subsystem with one dedicated battery charger inoperable (e.g., the voltage limit of SR 3.8.4.1 is not maintained). The ACTIONS provide a tiered response that focuses on returning the battery to the fully charged state and restoring a fully qualified charger to OPERABLE status in a reasonable time period. Required Action A. 1 requires that the terminal voltage be restored to greater than or equal to the minimum established float voltage within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months . This time provides for returning the dedicated charger to OPERABLE status or providing an alternate means of restoring the associated battery terminal voltage to greater than or equal to the minimum established float voltage. Restoring the battery terminal voltage to greater than or equal to the minimum established float voltage provides good assurance that, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , the battery will be restored to its fully charged condition (Required Action A.2) from any discharge that might have occurred due to the charger inoperability.

(continued)

DIABLO CANYON - UNITS 1 & 2 B 3.8-47 Revision 1 TABB3-8.DOC - RIA 47

DC Sources - Operating B 3.8.4 BASES ACTIONS A discharged battery having terminal voltage of at least the minimum (continued) established float voltage indicates that the battery is on the exponential charging current portion (the second part) of its recharge cycle. The time to return a battery to its fully charged state under this condition is simply a function of the amount of the previous discharge and the recharge characteristic of the battery. Thus there is good assurance of fully recharging the battery within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , avoiding a premature shutdown with its own attendant risk.

If established battery terminal float voltage cannot be restored to greater than or equal to the minimum established float voltage within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months , and the charger is not operating in the current-limiting mode, a faulty charger is indicated. A faulty charger that is incapable of maintaining established battery terminal float voltage does not provide assurance that it can revert to and operate properly in the current limit mode that is necessary during the recovery period following a battery discharge event that the DC system is designed for.

If the charger is operating in the current limit mode after 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months that is an indication that the battery is partially discharged and its capacity margins will be reduced. The time to return the battery to its fully charged condition in this case is a function of the battery charger capacity, the amount of loads on the associated DC system, the amount of the previous discharge, and the recharge characteristic of the battery. The charge time can be extensive, and there is not adequate assurance that it can be recharged within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months (Required Action A.2).

Required Action A.2 requires that the battery float current be verified as less than or equal to 2 amps. This indicates that, if the battery had been discharged as the result of the inoperable battery charger, it has now been fully recharged. If at the expiration of the 12 hour1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months period the battery float current is not less than or equal to 2 amps this indicates there may be additional battery problems and the battery must be declared inoperable in accordance with LCO 3.8.6 Required Action B.2.

Required Action A.3 limits the restoration time for the inoperable dedicated battery charger to 14 days. This action is applicable if an alternate means of restoring battery terminal voltage to greater than or equal to the minimum established float voltage has been used (e.g.,

backup charger or non-Class IE battery charger). The 14 day completion time reflects a reasonable time to effect restoration of the dedicated battery charger to operable status.

(continued)

DIABLO CANYON - UNITS 1 & 2 B 3.8-48 Revision I TABB3-8.DOC - RIA 48

DC Sources - Operating B 3.8.4 BASES ACTIONS B.1 (continued) Condition B represents one DC electrical power subsystem with one battery inoperable. With one battery inoperable, the DC bus is being supplied by the associated OPERABLE battery charger. Any event that results in a loss of the associated 480 VAC vital bus supporting the normal battery charger will also result in loss of or degraded DC to the associated DC electrical power subsystem. Recovery of the 480 VAC vital bus, especially if it is due to a loss of offsite power, will be hampered by the fact that many of the components necessary for the recovery (e.g., diesel generator control and field flash, AC load shed and diesel generator output circuit breakers, etc.) likely rely upon the battery. In addition, the energization transients of any DC loads that are beyond the capability of the battery charger and normally require the assistance of the battery will not be able to be brought online. The 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months limit allows sufficient time to effect restoration of an inoperable battery given that the majority of the conditions that lead to battery inoperability (e.g., loss of battery charger, battery cell voltage less than 2.07 V, etc.) are identified in Specifications 3.8.4, 3.8.5, and 3.8.6 together with additional specific completion times.

C.1 Condition C represents one Class I E DC electrical power subsystem and associated ESF equipment with a loss of ability to completely respond to an event, and a potential loss of ability to remain energized during normal operation. It is, therefore, imperative that the operators attention focus on stabilizing the unit, minimizing the potential for complete loss of DC power to the affected subsystem. The 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months limit is consistent with the allowed time for an inoperable DC distribution subsystem.

If one of the required DC electrical power subsystems is inoperable for reasons other than Condition A or B (e.g., inoperable battery charger and associated inoperable battery), the remaining DC electrical power subsystems have the capacity to support a safe shutdown and to mitigate an accident condition. Since a subsequent worst case single failure could, however, result in the loss of the minimum necessary DC electrical power subsystems to mitigate a worst case accident, continued power operation should not exceed 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months . The 2 hour2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months Completion Time is based on Regulatory Guide 1.93 (Ref. 7) and reflects a reasonable time to assess unit status as a function of the inoperable DC electrical power subsystem and, if the DC electrical power subsystem is not restored to OPERABLE status, to prepare to effect an orderly and safe unit shutdown.

(continued)

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DC Sources - Operating B 3.8.4 BASES ACTIONS DA (continued)

The design of the 125 VDC electrical power distribution system is such that a battery can have associated with it a dedicated full capacity charger powered from its associated 480 VAC vital bus or a backup full capacity charger powered from another 480 VAC vital bus. Use of the backup full capacity charger results in more than one full capacity charger receiving power simultaneously from a single 480 V vital bus and causes the requirements of independence and redundancy between subsystems to no longer be maintained. Thus, operation with two chargers powered by the same vital bus is limited to 14 days.

E.1 and E.2 If the inoperable DC electrical power subsystem cannot be restored to OPERABLE status within the required Completion Time, the unit must be brought to a MODE in which the LCO does not apply. To achieve this status, the unit must be brought to at least MODE 3 within 6 hours6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months and to MODE 5 within 36 hours4.166667e-4 days 0.01 hours 5.952381e-5 weeks 1.3698e-5 months . The allowed Completion Times are reasonable, based on operating experience, to reach the required unit conditions from full power conditions in an orderly manner and without challenging plant systems. The Completion Time to bring the unit to MODE 5 is consistent with the time required in Regulatory Guide 1.93 (Ref. 7).

(continued)

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DC Sources - Operating B 3.8.4 BASES (continued)

SURVEILLANCE SR 3.8.4.1 REQUIREMENTS The minimum established float voltage provided by the battery manufacturer is 2.17 Vpc or 130.2 V at the battery terminals for a 60-cell battery. This voltage maintains the battery plates in a condition that supports maintaining the grid life (expected to be approximately 20 years). Verifying battery terminal voltage while on float charge for the batteries helps to ensure the effectiveness of the battery chargers, which support the ability of the batteries to perform their intended function. Float charge is the condition in which the charger is supplying the continuous charge required to overcome the internal losses of a battery and maintain the battery in a fully charged state, while supplying the continuous steady state loads of the associated DC electrical power subsystem. On float charge, battery cells will receive adequate current to optimally charge the battery. The 7 day Frequency is consistent with manufacturer recommendations and IEEE-450 (Ref. 8).

SR 3.8.4.2 This SR verifies the design capacity of the battery chargers. According to Regulatory Guide 1.32 (Ref. 9), the battery charger supply is recommended to be based on the largest combined demands of the various steady state loads and the charging capacity to restore the battery from the design minimum charge state to the fully charged state, irrespective of the status of the unit during these demand occurrences. The minimum required amperes and duration ensures that these requirements can be satisfied.

This SR provides two options. One option requires that each battery charger be capable of supplying 400 amps at the minimum established float voltage for greater than 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months . The ampere requirements are based on the output rating of the chargers. The voltage requirements are based on the charger voltage level after a response to a loss of AC power. The time period is sufficient for the charger temperature to have stabilized and to have been maintained for at least 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months .

The other option requires that each battery charger be capable of recharging the battery after a service test coincident with supplying the largest combined demands of the various continuous steady state loads (irrespective of the status of the plant during which these demands occur). This level of loading may not normally be available following the battery service test and will need to be supplemented with additional loads. The duration for this test may be longer than the charger sizing criteria since the battery recharge is affected by float voltage, temperature, and the exponential decay in charging current.

The battery is recharged when the measured charging current is

2 amps.

(continued)

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DC Sources - Operating B 3.8.4 BASES SURVEILLANCE The Surveillance Frequency is acceptable, given the unit conditions REQUIREMENTS required to perform the test and the other administrative controls (continued) existing to ensure adequate charger performance during these 24 month intervals. In addition, this Frequency is intended to be consistent with expected fuel cycle lengths.

SR 3.8.4.3 I A battery service test is a special test of battery capability, as found, to satisfy the design requirements (battery duty cycle) of the DC electrical power system. The discharge rate and test length should correspond to the design duty cycle requirements as specified in FSAR Chapter 8, (Ref. 4).

The Surveillance Frequency of 24 months is consistent with the intent of Regulatory Guide 1.32 (Ref. 9) and Regulatory Guide 1.129 (Ref. 10), which state that the battery service test should be performed during refueling operations or at some other outage.

This SR is modified by two Notes. Note 1 allows the performance of a modified performance discharge test in lieu of a service test.

The reason for Note 2 is that performing the Surveillance would perturb the electrical distribution system and challenge safety systems.

REFERENCES 1. 10 CFR 50, Appendix A, GDC 17.

2. Regulatory Guide 1.6, March 10, 1971.

3. IEEE Std. 308-1971.

4. FSAR, Chapter 8.

5. FSAR, Chapter 6. I

6. FSAR, Chapter 15. I

7. Regulatory Guide 1.93, December 1974. I

8. IEEE Std. 450-1995. I

9. Regulatory Guide 1.32, February 1977. I

10. Regulatory Guide 1.129, December 1974. I

11. Electrical Design Calculations 235A-DC thru 235F-DC. I DIABLO CANYON - UNITS 1 & 2 B 3.8-52 Revision I TABB3-8.DOC - R1A 52

DC Sources - Shutdown B 3.8.5 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.5 DC Sources-Shutdown BASES BACKGROUND A description of the DC sources is provided in the Bases for LCO 3.8.4, "DC Sources-Operating."

APPLICABLE The initial conditions of Design Basis Accident and transient analyses SAFETY in the FSAR, Chapter 6 (Ref. 1) and Chapter 15 (Ref. 2), assume that ANALYSES Engineered Safety Feature systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the diesel generators, emergency auxiliaries, and control and switching during all MODES of operation.

The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and the requirements for the supported systems' OPERABILITY.

The OPERABILITY of the minimum DC electrical power sources during MODES 5 and 6 and during movement of irradiated fuel assemblies ensures that:

a. The unit can be maintained in the shutdown or refueling condition for extended periods;

b. Sufficient instrumentation and control capability is available for monitoring and maintaining the unit status; and

c. Adequate DC electrical power is provided to mitigate events postulated during shutdown, such as a fuel handling accident.

The DC sources satisfy Criterion 3 of 10 CFR 50.36(c)(2)(ii).

LCO The DC electrical power subsystems, each subsystem consisting of one battery, one battery charger per battery, and the corresponding control equipment and interconnecting class I E cabling within the subsystem, are required to be OPERABLE to support required trains of the distribution systems required OPERABLE by LCO 3.8.10, "Distribution Systems-Shutdown." An OPERABLE subsystem consists of a DC bus connected to a battery with an OPERABLE battery charger which is fed from an OPERABLE AC vital bus (Ref B.3.8.10).

(continued)

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DC Sources - Shutdown B 3.8.5 BASES LCO With administrative controls in place, DC buses may be cross-tied when (continued) a battery is taken out for maintenance provided that the battery and the Class 1E cross-tie has sufficient capacity and protection for its own loads and the cross-tie loads. The resulting circuit is not required to be single failure resistant. This ensures the availability of sufficient DC electrical power sources to operate the unit in a safe manner and to mitigate the consequences of postulated events during shutdown (e.g. fuel handling accidents).

APPLICABILITY The DC electrical power sources required to be OPERABLE in MODES 5 and 6, and during movement of irradiated fuel assemblies, provide assurance that:

a. Required features to provide adequate coolant inventory makeup are available for the irradiated fuel assemblies in the core;

b. Required features needed to mitigate a fuel handling accident are available;

c. Required features necessary to mitigate the effects of events that can lead to core damage during shutdown are available; and

d. Instrumentation and control capability is available for monitoring and maintaining the unit in a cold shutdown condition or refueling condition.

The DC electrical power requirements for MODES 1,2, 3, and 4 are covered in LCO 3.8.4.

ACTIONS A.1J A.2.1. A.2.2. A.2.3. and A.2.4 One or more required DC electrical power subsystems may be inoperable provided that the remaining OPERABLE DC electrical power subsystem(s) support the DC electrical power distribution subsystem(s) required by LCO 3.8.10, "Distribution Systems - Shutdown," and are capable of supporting sufficient systems to allow continuation of CORE ALTERATIONS and fuel movement. By allowing the option to declare affected required features inoperable with the associated DC power source(s) inoperable, appropriate restrictions will be implemented in accordance with the affected required features LCO ACTIONS. A required feature is not affected if sufficient power is provided by the associated DC power source such that the feature is capable of performing its specified safety function(s). An engineering evaluation may be required to determine if a required feature is affected. For (continued)

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DC Sources - Shutdown B 3.8.5 BASES ACTIONS A.1. A.2.1. A.2.2. A.2.3. and A.2.4 (continued) example, see references 3 and 4. In many instances, this option may involve undesired administrative efforts. Therefore, the allowance for sufficiently conservative actions is made (i.e., to suspend CORE ALTERATIONS, movement of irradiated fuel assemblies, and operations involving positive reactivity additions). The Required Action to suspend positive reactivity additions does not preclude actions to maintain or increase reactor vessel inventory, provided the required SDM is maintained. Suspension of these activities shall not preclude completion of actions to establish a safe conservative condition. These actions minimize probability of the occurrence of postulated events. It is further required to immediately initiate action to restore the required DC electrical power subsystems and to continue this action until restoration is accomplished in order to provide the necessary DC electrical power to the unit safety systems.

The Completion Time of immediately is consistent with the required times for actions requiring prompt attention. The restoration of the required DC electrical power subsystems should be completed as quickly as possible in order to minimize the time during which the unit safety systems may be without sufficient power.

SURVEILLANCE SR 3.8.5.1 SR 3.8.5.1 requires performance of all Surveillances required by SR 3.8.4.1 through SR 3.8.4.3. Therefore, see the corresponding Bases for LCO 3.8.4 for a discussion of each SR.

This SR is modified by a Note. The reason for the Note is to preclude requiring the OPERABLE DC sources from being discharged below their capability to provide the required power supply or otherwise rendered inoperable during the performance of an SR. This note does not except the requirement for the battery to be capable of performing the particular function, just that the capability need not be demonstrated while that source of power is being relied on to meet the LCO.

REFERENCES 1. FSAR, Chapter 6.

2. FSAR, Chapter 15.

3. DCM S-67, "125V/250V Direct Current System, Section 4.3.1."

4. AR A0456369 DIABLO CANYON - UNITS 1 & 2 B 3.8-55 Revision I TABB3-8.DOC - R1A 55

Battery Parameters B 3.8.6 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.6 Battery Parameters I BASES BACKGROUND This LCO delineates the limits on battery float current as well as electrolyte temperature, level, and float voltage for the DC electrical power subsystem batteries. A discussion of these batteries and their OPERABILITY requirements is provided in the Bases for LCO 3.8.4, "DC Sources - Operating," and LCO 3.8.5, "DC Sources - Shutdown."

In addition to the limitations of this Specification, the Battery Monitoring and Maintenance Program also implements a program specified in Specification 5.5.17 for monitoring various battery parameters that is based on the recommendations of IEEE Standard 450, "IEEE Recommended Practice For Maintenance, Testing, And Replacement Of Vented Lead-Acid Batteries For Stationary Applications' (Ref. 3).

The battery cells are of flooded lead acid construction with a nominal specific gravity of 1.215. This specific gravity corresponds to an open circuit battery voltage of approximately 125 V for a 60 cell battery (i.e.,

cell voltage of 2.06 volts per cell (Vpc)). The open circuit voltage is the voltage maintained when there is no charging or discharging. Once fully charged with its open circuit voltage Ž 2.06 Vpc, the battery cell will maintain its capacity for 30 days without further charging per manufacturing instructions. Optimal long term performance however, is obtained by maintaining a float voltage range of 2.20 to 2.25 Vpc.

This provides adequate over-potential which limits the formation of lead sulfate and self discharge. The float voltage range of 2.20 to 2.25 Vpc corresponds to a total float voltage output range of 132.0 through 135.0 V for a 60 cell battery.

APPLICABLE The initial conditions of Design Basis Accident (DBA) and transient SAFETY analyses in the FSAR, Chapter 6 (Ref. 1) and Chapter 15 (Ref. 2),

ANALYSES assume Engineered Safety Feature systems are OPERABLE. The DC electrical power system provides normal and emergency DC electrical power for the diesel generators, emergency auxiliaries, and control and switching during all MODES of operation.

The OPERABILITY of the DC subsystems is consistent with the initial assumptions of the accident analyses and is based upon meeting the design basis of the unit. This includes maintaining the required DC electrical power subsystem(s) OPERABLE during accident conditions, in the event of:

a. An assumed loss of all offsite AC power or all onsite AC power; and

b. A worst case single failure.

Battery parameters satisfy the Criterion 3 of 10 CFR 50.36(c)(2)(ii). I (continued)

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Battery Parameters B 3.8.6 BASES (continued)

LCO Battery parameters must remain within acceptable limits to ensure I availability of the required DC power to shut down the reactor and maintain it in a safe condition after an anticipated operational occurrence or a postulated DBA. Battery parameter limits are I conservatively established, allowing continued DC electrical system function even with limits not met. Additional preventive maintenance, testing, and monitoring performed in accordance with the Battery Monitoring and Maintenance Program is conducted as specified in Specification 5.5.17.

APPLICABILITY The battery parameters are required solely for the support of the I associated DC electrical power subsystems. Therefore, battery OPERABILITY is only required when the DC power source is required to be OPERABLE. Refer to the Applicability discussion in Bases for LCO 3.8.4 and LCO 3.8.5.

(continued)

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Battery Parameters B 3.8.6 BASES (continued)

ACTIONS A.1, A.2, and A.3 With one or more cells in one battery < 2.07 V, the battery cell is degraded. Within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months verification of the required battery charger OPERABILITY is made by monitoring the battery terminal voltage (SR 3.8.4.1) and of the overall battery state of charge by monitoring the battery float charge current (SR 3.8.6.1). This assures that there is still sufficient battery capacity to perform the intended function. Therefore, the affected battery is not required to be considered inoperable solely as a result of one or more cells < 2.07 V, and continued operation is permitted for a limited period up to 24 hours2.777778e-4 days 0.00667 hours 3.968254e-5 weeks 9.132e-6 months .

Since the Required Actions only specify uperform," a failure of SR 3.8.4.1 or SR 3.8.6.1 acceptance criteria does not result in this Required Action not met. However, if one of the SRs is failed the appropriate Conditions(s), depending on the cause of the failure, is entered. If SR 3.8.6.1 is failed when in Condition A, then there is not assurance that there is still sufficient battery capacity to perform the intended function. In this case the battery must be declared inoperable and Condition F must be entered.

B.1 and B.2 A battery with float current > 2 amps indicates that a partial discharge of the battery capacity has occurred. This may be due to a temporary loss of a battery charger or possibly due to one or more battery cells in a low voltage condition reflecting some loss of capacity. Within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months verification of the required battery charger OPERABILITY is made by monitoring the battery terminal voltage. If the terminal voltage is found to be less than the minimum established float voltage there are two possibilities, the battery charger is inoperable or is operating in the current limit mode. Condition A addressed charger inoperability. If the charger is operating in the current limit mode after 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months that is an indication that the battery has been substantially discharged and likely cannot perform its required design functions. The time to return the battery to its fully charged condition in this case is a function of the battery charger capacity, the amount of loads on the associated DC system, the amount of the previous discharge, and the recharge characteristic of the battery. The charge time can be extensive, and there is not adequate assurance that it can be recharged within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months (Required Action B.2). The battery must therefore be declared inoperable.

(continued)

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Battery Parameters B 3.8.6 BASES ACTIONS If the float voltage is found to be satisfactory but there are one or more (continued) battery cells with float voltage less than 2.07 V, the associated "OR" statement in Condition F is applicable and the battery must be declared inoperable immediately. If float voltage is satisfactory and there are no cells less than 2.07 V there is good assurance that, within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , the battery will be restored to its fully charged condition (Required Action B.2) from any discharge that might have occurred due to temporary loss of the battery charger. A discharged battery with float voltage (the charger setpoint) across its terminals indicates that the battery is on the exponential charging current portion (the second part) of its recharge cycle. The time to return a battery to its fully charged state under this condition is simply a function of the amount of previous discharge and the recharge characteristic of the battery. Thus there is good assurance of fully recharging the battery within 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months , avoiding a premature shutdown with its own attendant risk.

If the condition is due to one or more cells in a low voltage condition but still greater than 2.07 V and float voltage is found to be satisfactory, this is not indication of a substantially discharged battery and 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months is a reasonable time prior to declaring the battery inoperable.

Since Required Action B.1 only specifies 'perform,' a failure of SR 3.8.4.1 acceptance criteria does not result in the Required Action not met. However, if SR 3.8.4.1 is failed, the appropriate Condition(s),

depending on the cause of the failure, is entered.

C.1, C.2, and C.3 With one battery with one or more cells electrolyte level above the top of the plates, but below the minimum established design limits, the battery still retains sufficient capacity to perform the intended function.

Therefore, the affected battery is not required to be considered inoperable solely as a result of electrolyte level not met. Within 31 days the minimum established design limits for electrolyte level must be re-established.

With electrolyte level below the top of the plates there is a potential for dryout and plate degradation. Required Actions C.1 and C.2 address this potential (as well as provisions in Specification 5.5.17, Battery Monitoring and Maintenance Program). They are modified by a note that indicates they are only applicable if electrolyte level is below the top of the plates. Within 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months level is required to be restored to above the top of the plates. The Required Action C.2 requirement to verify that there is no leakage by visual inspection and the Specification 5.5.17.b item to initiate action to equalize and test in accordance with manufacturer's recommendation are taken from Annex D of IEEE Standard 450 (Ref. 3). They are performed following the restoration of the electrolyte level to above the top of the plates. Based on the results of the manufacturer's recommended testing the battery may have to be declared inoperable and the affected cells(s) replaced.

(continued)

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Battery Parameters B 3.8.6 BASES ACTIONS D.1 (continued) With a battery with pilot cell temperature less than the minimum established design limits, 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months is allowed to restore the temperature to within limit. A low electrolyte temperature limits the current and power available. Since the battery is sized with margin, while battery capacity is degraded, sufficient capacity exists to perform the intended function and the affected battery is not required to be considered inoperable solely as a result of the pilot cell temperature not met.

E.1 With two or more batteries in redundant DC electrical power subsystems with battery parameters not within limits there is not sufficient assurance that battery capacity has not been affected to the degree that the batteries can still perform there required function, given that redundant batteries are involved. With redundant batteries involved this potential could result in total loss of function on multiple systems that rely upon the batteries. The longer completion times specified for battery parameters on non-redundant batteries not within limits are therefore not appropriate, and the parameters must be restored to within limits on at least one DC electrical power subsystem within 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months .

F.1 With one battery with any battery parameter outside the allowances of the Required Actions for Condition A, B, C, D, or E, sufficient capacity I

to supply the maximum expected load requirement is not assured and the corresponding DC battery must be declared inoperable.

Additionally, discovering a battery with one or more battery cells float voltage less than 2.07 V and float current greater than 2 amps indicates that the battery capacity may not be sufficient to perform the intended functions. The battery must therefore be declared inoperable immediately.

(continued)

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Battery Parameters B 3.8.6 BASES (continued)

SURVEILLANCE SR 3.8.6.1 REQUIREMENTS Verifying battery float current while on float charge is used to determine the state of charge of the battery. Float charge is the condition in which the charger is supplying the continuous charge required to overcome the internal losses of a battery and maintain the battery in a charged state. The float current requirements are based on the float current indicative of a charged battery. Use of float current to determine the state of charge of the battery is consistent with IEEE-450 (Ref. 3). The 7 day frequency is consistent with IEEE-450 (Ref. 3).

This SR is modified by a Note that states the float current requirement is not required to be met when battery terminal voltage is less than the minimum established float voltage of SR 3.8.4.1. When this float voltage is not maintained the Required Actions of LCO 3.8.4 Action A are being taken, which provide the necessary and appropriate verifications of the battery condition. Furthermore, the float current limit of 2 amps is established based on the nominal float voltage value and is not directly applicable when this voltage is not maintained.

SR 3.8.6.2 and 3.8.6.5 Optimal long term battery performance is obtained by maintaining a float voltage greater than or equal to the minimum established float voltage provided by the battery manufacturer, which corresponds to 130.2 V for 60 cells at the battery terminals, or 2.17 Vpc. This provides adequate over-potential, which limits the formation of lead sulfate and self discharge, which could eventually render the battery inoperable.

Float voltages in the range of less than 2.13 Vpc, but greater than 2.07 Vpc, are addressed in Specification 5.5.17. SRs 3.8.6.2 and 3.8.6.5 require verification that the cell float voltages are equal to or greater than the short term absolute minimum voltage of 2.07 V. The Frequency for cell voltage verification every 31 days for pilot cell and 92 days for each connected cell is consistent with IEEE-450 (Ref. 3).

SR 3.8.6.3 The electrolyte level minimum established design limit is the manufacturer minimum level indication mark on the battery case. The limit specified for electrolyte level ensures that the plates suffer no physical damage and maintains adequate electron transfer capability.

The Frequency is consistent with IEEE-450 (Ref. 3).

(continued)

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Battery Parameters B 3.8.6 BASES SURVEILLANCE SR 3.8.6.4 REQUIREMENTS (continued) This Surveillance verifies that the pilot cell temperature is greater than or equal to the minimum established design limit (i.e. 60 0F). Pilot cell electrolyte temperature is maintained above this temperature to assure the battery can provide the required current and voltage to meet the design requirements. Temperatures lower than assumed in battery sizing calculations act to inhibit or reduce battery capacity. The Frequency is consistent with IEEE-450 (Ref. 3).

SR 3.8.6.6 A battery performance discharge test is a test of constant current capacity of a battery, normally done in the as found condition, after having been in service, to detect any change in the capacity determined by the acceptance test. The test is intended to determine overall battery degradation due to age and usage.

Either the battery performance discharge test or the modified performance discharge test is acceptable for satisfying SR 3.8.6.6; however, only the modified performance discharge test may be used to satisfy the battery service test requirements of SR 3.8.4.3.

A modified performance discharge test is a test of the battery capacity and its ability to provide a high rate, short duration load (usually the highest rate of the duty cycle). This will often confirm the battery's ability to meet the critical period of the load duty cycle, in addition to determining its percentage of rated capacity. Initial conditions for the modified performance discharge test should be identical to those specified for a service test. The modified performance discharge test and service test should be performed in accordance with IEEE-450 (Ref. 3).

It may consist of just two rates; for instance the one minute rate published for the battery or the largest current load of the duty cycle, followed by the test rate employed for the performance test, both of which envelope the duty cycle of the service test. Since the ampere-hours removed by a one minute discharge represents a very small portion of the battery capacity, the test rate can be changed to that for the performance test without compromising the results of the performance discharge test. The battery terminal voltage for the modified performance discharge test must remain above the minimum battery terminal voltage specified in the battery service test for the duration of time equal to that of the service test.

(continued)

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Battery Parameters B 3.8.6 BASES SURVEILLANCE SR 3.8.6.6 (continued)

REQUIREMENTS The acceptance criteria for this Surveillance are consistent with IEEE-450 (Ref. 3) and IEEE-485 (Ref. 5). These references recommend that the battery be replaced if its capacity is below 80% of the manufacturer's rating. A capacity of 80% shows that the battery rate of deterioration is increasing, even if there is ample capacity to meet the load requirements. Furthermore, the battery is sized to meet the assumed duty cycle loads when the battery design capacity reaches this 80% limit.

The Surveillance Frequency for this test is normally 60 months. If the battery shows degradation, or if the battery has reached 85% of its expected service life and capacity is < 100% of the manufacturer's rating, the Surveillance Frequency is reduced to 24 months. However, if the battery shows no degradation but has reached 85% of its expected life, the Surveillance Frequency is only reduced to 24 months for batteries that retain capacity 2 100% of the manufacturer's rating.

Degradation is indicated, according to IEEE-450 (Ref. 3), when the battery capacity drops by more than 10% relative to its capacity on the previous performance test or when it is < 90% of the manufacturer's rating. The Surveillance Frequency basis is consistent with IEEE-450 (Ref. 3), except if accelerated testing is required, it will be performed at a 24-month frequency to coincide with a refueling outage.

This SR is modified by a Note. The reason for the Note is that performing the Surveillance would perturb the electrical distribution system and challenge safety systems.

REFERENCES 1. FSAR, Chapter 6.

2. FSAR, Chapter 15.

3. IEEE Std. 450-1995.

4. FSAR, Chapter 8 I

5. IEEE Std. 485-1983. I DIABLO CANYON - UNITS 1 & 2 B 3.8-63 Revision I TABB3-8.DOC - RlA 63

Enclosure 6 PG&E Letter DCL-03-084

SUMMARY

OF DIFFERENCES FROM TSTF-360, REVISION I

Enclosure 6 PG&E Letter DCL-03-084 LIST OF STARS PLANT LAR DIFFERENCES FROM TSTF-360, REVISION I APPLICABILITY DIFF. NO. LOCATION DESCRIPTION COMANCHE PEAK DIABLO CANYON 3.8.4-01 LCO 3.8.4 The word "required" is added to the bracketed condition description wording Yes No Condition A provided for plants with two batteries in each DC electric power subsystem (train). This difference is needed for clarification because at CPSES each DC electrical power subsystem (train) consists of two batteries with each battery provided with two full sized and fuily qualified battery chargers. Adding the term "required" refers to the battery charger presently in service for each battery in each DC subsystem as specified in the TS Bases Table B 3.8.4-1.

This change is specific to the CPSES plant configuration and is consistent with the current CPSES plant-licensing basis.

3.8.4-02 LCO 3.8.4 The words "affected" and "required" are added to the Required Action Yes No Required Actions A. 1, statements to clarify that the action is associated with battery(ies) directly A.2, A.3, and B.l affected by the inoperable required battery charger(s). This difference is plant-specific and is consistent with the current CPSES plant-licensing basis.

3.8.4-03 LCO 3.8.4 The Completion Time for LCO 3.8.4 Required Action A.2 is revised from No Yes Required Action A.2 "Once per 12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months " to "12 hours1.388889e-4 days 0.00333 hours 1.984127e-5 weeks 4.566e-6 months " to verify battery float current less than or Completion Time equal 2 amps. This change is only applicable to DCPP.

3.8.4-04 LCO 3.8.4 The Completion Time for LCO 3.8.4 Required Action A.3 is revised from No Yes Required Action A.3 "7 days" to "14 days" based on the current plant-specific design and licensing Completion Time basis for DCPP. This difference from TSTF-360, Revision 1, is applicable only to DCPP.

3.8.4-05 LCO 3.8.4 LCO 3.8.4 Condition D for more than one full capacity chirger receiving No Yes Condition D power simultaneously from a single 480 V vital bus, including its associated Required Action and Completion Time, is retained by DCPP based on its current plant-specific design and licensing basis. This difference from TSTF-360, Revision 1, is applicable only to DCPP.

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Enclosure 6 PG&E Letter DCL-03-084 LIST OF STARS PLANT LAR DIFFERENCES FROM TSTF-360, REVISION I APPLICABILITY DIFF. NO. LOCATION DESCRIPTION COMANCHE PEAK DIABLO CANYON 3.8.4-06 SR 3.8.4.2 The first performance option of this surveillance test is also revised to replace Yes No First Test Option the TSTF- 360, Revision 1, bracketed value of '5[400] amps" for the battery charger test current with the current CPSES plant- specific value of '>300 amps" presently required by SR 3.8.4.6. This difference is only applicable to CPSES and is consistent with the current CPSES plant design and license bases.

3.8.4-07 SR 3.8.4.2 SR 3.8.4.2 is revised to replace the bracketed value for the battery charger No Yes First Test Option test duration of 'i> [8] hours" with the plant-specific value of 'Ž 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months ."

This change is specific to DCPP.

3.8.4-08 SR 3.8.4.3 Note 2 is different from the corresponding Note provided in TSTF-360, Yes No Note 2 Revision 1, because the current SR 3.8.4.7 surveillance test requirement at CPSES is not changed, but only renumbered to SR 3.8.4.3. Thus, Note 2 is also retained unchanged. This difference is consistent with the current CPSES licensing basis and is applicable only to CPSES.

3.8.4-09 SR 3.8.4.2 and This difference from TSTF-360, Revision 1, is reflective of the current 24 No Yes SR 3.8.4.3 month surveillance test frequency applicable to DCPP.

3.8.5-01 LCO 3.8.5 This difference from TSTF-360, Revision 1, is based on and consistent with Yes Yes (entire specification) the Reviewer's Note for standard TS LCO 3.8.5 as provided in NUREG-1431, Revision 2. CPSES would retain its current LCO 3.8.5 requirements and APPLICABILITY that require only one DC electrical power subsystem train to be operable during shutdown conditions. Hence, the TSTF-360, Revision 1, changes to LCO 3.8.5 (Action A and the bracketed optional wording in Condition B) are not proposed, with the exception that the SR 3.8.5.1 references to the Section 3.8.4 surveillance test requirements be revised to reflect the proposed changes to the Section 3.8.4 Surveillance Requirements, consistent with the changes proposed in TSTFL 360, Revision 1. This difference is based on the curmant CPSES licensing basis and is also applicable to DCPP.

3.8.6-01 LCO 3.8.6 The LCO 3.8.6 Condition A, B, and C is revised from "one battery on one No Yes Condition A, B, and C train" to "one battery" to reflect the plant-specific design of three Class IE batteries and one battery per DC electrical power subsystem. This is a DCPP only change.

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Enclosure 6 PG&E Letter DCL-03-084 LIST OF STARS PLANT LAR DIFFERENCES FROM TSTF-360, REVISION 1 APPLICABILITY DIFF. NO. LOCATION DESCRIPTION COMANCHE PEAK DIABLO CANYON 3.8.6-02 LCO 3.8.6 The word "affected" is added to the Required Action B.2 statement to clarify Yes No Required Actions B.2 that the action is associated with the battery(ies) with float current > 2 amps.

This difference is consistent with similar changes proposed for the Required Actions of LCO 3.8.4. This difference is plant-specific and is consistent with the current CPSES plant-licensing basis.

3.8.6-03 LCO 3.8.6 The phrase "affected cell(s)" is added for clarification in regard to restoration Yes Yes Required Actions C. 1 of cell electrolyte level. This difference is consistent with the current CPSES and C.3 plant licensing basis and is applicable to both CPSES and DCPP.

3.8.6-04 LCO 3.8.6 The LCO 3.8.6 Condition E is revised from "one or more batteries in No Yes Condition E redundant trains" to "two or more batteries" to reflect the plant-specific design of three Class IE batteries and one battery per DC electrical power subsystem. This is a DCPP only change.

3.8.6-05 SR 3.8.6.6 The Note accompanying SR 3.8.6.6 is different from the corresponding Note Yes No Note provided in TSTF-360, Revision 1,because the current SR 3.8.4.8 surveillance test requirement at CPSES is not changed, but only renumbered to SR 3.8.6.6. Thus, the current Note is also retained unchanged. This difference is consistent with the current CPSES licensing basis and is applicable only to CPSES.

5.5-01 5.5.19 Different from TSTF-360, Revision 1, the TS Administrative Control Yes Yes (5.5.17 for DCPP) Program 5.5.19 for CPSES (and 5.5.17 for DCPP) "Battery Maintenance and Battery Monitoring and Monitoring Program," reference to the IEEB450 version year 1995 is moved Maintenance Program to the Bases. The supporting justification for this difference is provided in Enclosure 1 as part of Proposed Change (5 e). This change is applicable to both CPSES and DCPP.

5.5- 02 5.5.19 Different from TSTF- 360, Revision 1, the TS Administrative Control Yes Yes (5.5.17 for DCPP) Program 5.5.19 for CPSES (and 5.5.17 for DCPP) "Battery Maintenance and Battery Monitoring Monitoring Program," paragraph b., the phrase "below the minimum and Maintenance established design limit" is replaced by "below the top of the plates." The Program minimum established design limit is a level above the top of the plates. This change is needed to be consistent with IEEE. 450-1995, Annex D. This change is applicable to both CPSES and DCPP.

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Enclosure 7 PG&E Letter DCL-03-084 SINGLE LINE DIAGRAM OF DCPP 125 V DC SYSTEM

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-~~~~~~~~~~~~~~

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DCL-03-084, License Amendment Request 03-11, Revision to Technical Specifications Associated with DC Electrical Power Systems

Contents

Text

Dear Commissioners and Staff:

1.0 DESCRIPTION

2.0 PROPOSED CHANGE

3.0 BACKGROUND

5.0 REGULATORY ANALYSIS

6.0 ENVIRONMENTAL CONSIDERATION

7.0 REFERENCES

7.1 REFERENCES

SUMMARY

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DCL-03-084, License Amendment Request 03-11, Revision to Technical Specifications Associated with DC Electrical Power Systems

Text

Dear Commissioners and Staff:

1.0 DESCRIPTION

2.0 PROPOSED CHANGE

3.0 BACKGROUND

5.0 REGULATORY ANALYSIS

6.0 ENVIRONMENTAL CONSIDERATION

7.0 REFERENCES

7.1 REFERENCES

SUMMARY

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