ML15027A123

Technical Specification (TS) Bases Revision 61, Replacement Pages and Insertion Instructions

ML15027A123
Person / Time
Site:	Palo Verde
Issue date:	12/19/2014
From:	Stephenson C J Arizona Public Service Co
To:	Office of Nuclear Reactor Regulation
Shared Package
ML15027A129	List: ML15027A064 ML15027A122 ML15027A123 ML15027A124 ML15027A126
References
102-06979-TNW/CJS
Download: ML15027A123 (49)

Text

PVNGS Technical Specification Bases (TS Bases) Revision 61 Replacement Pages and Insertion Instructions The following LDCRs are included in" this change: Technical Specification Bases Revision 61 includes the following changes:

• LDCRs 12-B007 and 14-B010 reflect conforming changes to the Technical Specification (TS) Bases to implement License. Amendment 193, dated June 25, 2014. The changes involve the adoption of TSTF-500, related to station batteries.

Specifically, the descriptions of TS 3.8.4, DC Sources-Operating, TS 3.8.5, DC Sources-Shutdown, and TS 3.8.6, Battery Parameters.

• LDCR 14-B005 reflects a change in the designation of Spent Fuel Pool (SFP) storage module 5 for Unit 1 only. Specifically, this changes module 5 from being Region 3 to Region 2/4. Module 5 is located near the northwest corner of the SFP. This change restores the original designation for Unit 1, and will match Units 2 and 3.

• LDCR 14-B006 reflects a clarification of the descriptions of TS 3.3.12, Boron Dilution Alarm System (BOAS), and TS 3.9.2, Refueling Operations, Nuclear Instrumentation, regarding the relationship of the audible indication function of the Startup Range Monitor (SRM) to the BDAS alarm function.

Specifically, if the SRM is inoperable strictly due to a loss of its audible indication function, and the SRM is able to provide neutron flux indication signal to the associated BDAS channel, the BDAS channel can be considered operable.

Remove Page: Cover Page List of Effective Pages 1/2 through 9/Biank B 3.3.12-1 I B 3.3.12-2 B 3.7.17-11 B 3.7.17-2 B 3.8.4-1 I B 3.8.4-2 thru B 3.8.4-11 I Blank Insertion Instructions Insert New Page: Cover Page List of Effective Pages 1/2 through 9/Biank B 3.3.12-11 B 3.3.12-2 B 3.7.17-11 B 3.7.17-2 B 3.8.4-1 I 8 3.8.4-2 thru B 3.8.4-111 Blank PVNGS Technical Specification Bases (TS Bases) Revision 61 Replacement Pages and Insertion Instructions B 3.8.5-1 I B 3.8.5-2 thru B 3.8.5-5 I B 3.8.5-6 B 3.8.6-1 I B 3.8.6-2 thru B 3.8.6-7 I Blank B 3.9.2-1 I B 3.9.2-2 B I B 3.9.2-4 2 B 3.8,5-1 I B 3.8.5-2 . thru B 3.8.5-5 I Blank B 3.8.6-1 I B 3.8.6-2 thru B 3.8.6-9 I B 3.8.6-10 B 3.9.2-1 I B 3.9.2-2 B 3.9.2-3 I B 3.9.2-4 PVNGS ' Palo Verde Nuclear Generating Station Units 1, 2, and 3 Technical Specification Bases Revision 61 December 19,2014 TECHNICAL SPECIFICATION BASES LIST OF EFFECTIVE PAGES Page Rev. Page Rev No. No. No. No. B 2.1.1-1 0 B 3 .1. 3-2 0 B 2.1.1-2 0 B 3.1.3-3 0 B 2.1.1-3 37 B 3 .1. 3-4 0 B 2.1.1-4 21 B 3 .1. 3-5 0 B 2.1.1-5 54 B 3 .1. 3-6 56 B 2.1.2-1 0 B 3.1.4-1 0 B 2.1.2-2 31 B 3.1.4-2 31 B 2.1.2-3 0 B 3.1.4-3 0 B 2.1.2-4 54 B 3.1.4-4 0 B 3.0-1 49 B 3.1.4-5 0 B 3.0-2 0 B 3.1.5-1 0 B 3.0-3 0 B 3.1.5-2 52 B 3.0-4 0 B 3.1.5-3 52 B 3.0-5 42 B 3.1.5-4 52 B 3.0-6 48 B 3.1.5-5 52 B 3.0-7 48 B 3.1.5-6 52 B 3.0-8 42 B 3.1.5-7 52 B 3.0-9 42 B 3 .1. 5-8 52 B 3.0-10 42 B 3.1.5-9 60 B 3. 0-11 42 B 3.1.5-10 60 B 3.0-12 42 B 3.1.5-11 56 B 3.0-13 42 B 3.1. 5-12. 56 B 3.0-14 49 B 3.1.6-1 0 B 3.0-15 50 B 3 .1. 6-2 46 B 3.0-16 50 B 3.1.6-3 42 B 3.0-17 50 B 3.1.6-4 42 B 3.0-18 49 B 3 .1. 6-5 56 B 3.0-19 49 B 3.1.6-6 46 B 3.0-20 49 B 3.1.7-1 57 B 3.0-21 49 B 3.1.7-2 0 B 3.0-22 49 B 3.1.7-3 53 B 3.1.1-1 28 83.1.7-4 48 B 3.1.1-2 0 B 3.1.7-5 25 B 3.1.1-3 43 B 3.1.7-6 0 B 3.1.1-4 43 B 3 .. 1. 7-7 0 B 3.1.1-5 27 B 3.1.7-8 56 B 3.1.1-6 56 B 3.1.7-9 56 B 3.1.2-1 28 B 3.1.8-1 52 B 3.1.2-2 0 B 3.1.8-2 52 B 3.1.2-3 43 B 3.1.8-3 52 B 3.1.2-4 28 B 3.1.8-4 52 B3.1.2-5 0 B 3.1.8-5 56 B. 3.1.2-6 43 B 3.1.9-1 0 B 3.1.2-7 12 B 3 .1. 9-2 0 B 3.1.2-8 47 B 3.1.9-3 0 B3.1.2-9 56 B 3.1.9-4 0 B 3.1.3-1 0 B 3 .1. 9-5 56 PALO VERDE UNITS 1, 2, AND 3 1 Revision 61 December 19, 2014 TECHNICAL SPECIFICATION BASES LIST OF EFFECTIVE PAGES Page Rev. Page Rev No. No. No. No. B 3.1.9-6 56 B 3.2.5-2 10 B 3.1.10-1 0 B 0 B 3.1.10-2 53 B 3.2.5-4 52 B 3.1.10-3 0 B 3.2.5-5 0 B 3.1.10-4 37 B 3.2.5-6 56 B 3.1.10-5 56 B 3.2.5-7 0 B 3.1.10-6 0 B 3.3.1-1 35 B 3.1.11-1 0 B 3.3.1-2 53 B 3.1.11-2 53 B 3.3.1-3 53 B 3.1.11-3 0 B 3.3.1-4 60 B 3.1.11-4 53 B 3.3.1-5 53 B 3.1.11-5 0 B 3.3.1-6 53 B 3.2.1-1 53 B 3.3.1-7 53 B 3.2.1-2 10 B 3.3.1-8 53 B 3.2.1-3 53 B 3.3.1-9 53 B 3.2.1-4 0 B 3.3.1-10 53 B 3.2.1-5 0 B 3.3.1-11 53 B 3.2.1-6 0 B 3.3.1-12 53 B 3.2.1-7 56 B 3.3.1-13 53 B 3.2.1-8 56 B 3.3.1-14 53 B 3.2.2-1 52 B 3.3.1-15 53 B 3.2.2-2 10 B 3.3.1-16 53 B 3.2.2-3 0 B 3.3.1-17 53 B 3.2.2-4 52 B 3.3.1-18 53 B 3.2.2-5 1 B 3.3.1-19 53 B 3.2.2-6 0 B 3.3.1-20 53 B 3.2.2-7 56 B 3.3.1-21 53 B 3.2.3-1 52 B 3.3.1-22 53 B 3.2.3-2 10 B 3.3.1-23 53 B 3.2.3-3 0 B 3.3.1-24 53 B 3.2.3-4 52 B 3.3.1-25 53 B 3.2.3-5 0 B 3.3.1-26 53 B 3.2.3-6 0 B 3.3.1-27 53 B 3.2.3-7 60 B 3.3.1-28 53 B 3.2.3-8 56 B 3.3.1-29 53 B 3.2.3-9 56 B 3.3.1-30 53 B 3.2.3-10 0 B 3.3.1-31 53 B 3.2.4-1 52 B 3.3.1-32 53 B 3.2.4-2 10 B 3.3.1-33 53 B 3.2.4-3 0 B 3.3.1-34 53 B 3.2.4-4 52 B 3.3.1-35 53 B 3.2.4-5 60 B 3.3.1-36 53 B 3.2.4-6 53 B 3.3.1-37 53 B 3.2.4-7 53 B 3.3.1-38 53 B 3.2.4-8 56 B 3.3.1-39 53 B 3.2.4-9 56 B 3.3.1-40 56 B 3.2.5-1 52 B 3.3.1-41 56 PALO VERDE UNITS 1, 2, AND 3 2 Revision 61 December 19' 2014 TECHNICAL SPECIFICATION BASES LIST OF EFFECTIVE PAGES Page Rev. .Page Rev No. No. No. No. B 3.3.1-42 56 B 3.3.4-8 0 B 3.3.1-43 56 B 3.3.4-9 0 B 3.3.1-44 56 B 3.3.4-10 0 B 3.3.1-45 53 B 3.3.4-11 0 B 3.3.1-46 56 B 3.3.4-12 0 B 3.3.1-47 57 B 3.3.4-13 56 B 3.3.1-48 56 B 3.3.4-14 56 B 3.3.1-49 56 B 3.3.4-15 56 B 3.3.1-50 53 B 3.3.5-1 0 B 3.3.1-51 53 B 3.3.5-2 0 B 3.3.2-1 50 B 3.3.5-3 0 B 3.3.2-2 0 B 3.3.5-4 35 B 3.3.2-3 1 B 3.3.5-5 0 B 3.3.2-4 35 B 3.3.5-6 0 B 3.3.2-5 35 B 3.3.5-7 0 B 3.3.2-6 51 B 3.3.5-8 31 B 3.3.2-7 35 B 3.3.5-9 54 B 3.3.2-8 35 B 3.3.5-10 54 B 3.3.2-9 50 B 3.3.5-11 54 B 3.3.2-10 38 B 3.3.5-12 1 B 3.3.2-11 42 B 3.3.5-13 '0 B 3.3.2-12 42 B 3.3.5-14 0 B 3.3.2-13 56 B 3.3.5-15 35 B 3.3.2-14 56 B 3.3.5-16 51 B 3.3.2-15 56 B 3.3.5-17 35 B 3.3.2-16 56 B 3.3.5-18 54 B 3.3.2-17 56 B 3.3.5-19 54 B 3.3.2-18 35 B 3.3.5-20 54 B 3.3.3-1 53 B 3.3.5-21 35 B 3.3.3-2 53 B 3.3.5-22 35 B 3.3.3-3 53 B 3.3.5-23 52 B 3.3.3-4 53 B 3.3.5-24 38 B 3.3.3-5 53 B 3.3.5-25 42 B 3.3.3-6 53 B 3.3.5-26 56 B 3.3.3-7 53 B 3.3.5-27 56 B 3.3.3-8 53 B 3.3.5-28 56 B 3.3.3-9 53 B 3.3.5-29 56 B 3.3.3-10 56 B 3.3. 5-30 35 B 3.3.3-11 56 B 3.3.6-1 0 B 3.3.3-12 56 B 3.3.6-2 0 B 3.3.4-1 0 B 3.3.6-3 0 B 3.3.4-2 0 B 3.3.6-4 0 B 3.3.4-3 0 B 3.3.6-5 31 B 3.3.4-4 0 B 3.3.6-6 0 B 3.3.4-5 0 B 3.3.6-7 27 B 3.3.4-6 31 B 3.3.6-8 27 B 3.3.4-7 0 B 3.3.6-9 0 PALO VERDE UNITS 1, 2, AND 3 3 Revision 61 December 19' 2014 TECHNICAL SPECIFICATION BASES LIST OF EFFECTIVE PAGES Page Rev. 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Page Rev No. No. No. No. B 3.5.2-1 0 B 3.6.2-6 0 B 3.5.2-2 53 B *3.6.2-7 0 B 3.5.2-3 53 B 3.6.2-8 57 B 3.5.2-4 0 B 3.6.3-1 36 B 3.5.2-5 0 B 3.6.3-2. 43 B 3.5.2-6 0 B 3.6.3-3 49 B 3.5.2-7 1 B 3.6.3-4 43 B 3.5.2-8 22 B 3.6.3-5 43 B 3.5.2-9 57 .B 3.6.3-6 43 B 3.5.2-10 56 B 3.6.3-7 43 B 3.5.3-1 0 B 3.6.3-8 43 B 3.5.3-2 48 B 3.6.3-9 43 B 3.5.3-3 0 B 3.6.3-10 43 B 3.5.3-4 0 B 3.6.3-11 43 B 3.5.3-5 0 B 3.6.3-12 43 B 3.5.3....:'6 2 B 3.6.3-13 43 B 3.5.3-7 2 B 3.6.3-14 43 B 3.5.3-8 56 B 3.6.3-15 43 B 3.5.3-9 56 B 3.6.3-16 56 B 3.5.3-10 56 B 3.6.3-17 56 B 3.5.4-1 15 B 3.6.3-18 56 B 3.5.4-2 0 B 3.6.3-19 56 *B 3.5.4-3 42 B 3.6.4-1 53 B 3.5.5-;1 54 B 3.6.4-2 38 B 3.5.5-2 54 B 3.6.4-3 56 B 3.5.5-3 55 B 3.6.5-1 0 B 3.5.5-4 54 B 3.6.5-2 1 B 3.5.5-5 51 B 3.6.5-3 56 B 3.5.5-6 51 B 3.6.5-4 0 B 3.5.5-7 51 B 3.6.6-1 0 B 3.5.5-8 56 B 3.6.6-2 0 B 3.5.5-9 56 B 3.6.6-3 53 B 3.5.6-1 0 B 3.6.6-4 7 B 3.5.6-2 1 B 3.6.6-5 1 B 3.5.6-3 0 B 3.6.6-6 56 B 3.5.6-4 56 B 3.6.6-7 56 B 3.5.6-5 56 B 3.6.6-8 56 B 3.6.1-1 0 B 3.6.6-9 54 B 3.6.1-2 53 B 3.7.1-1 28 B 3.6.1-3 0 B 3.7.1-2 50 B 3.6.1-4 29 B 3.7.1-3 34 B 3.6.1-5 29 B 3.7.1-4 34 B 3.6.2-1 45 B 3.7.1-5 54 B 3.6.2-2 53 B 3.7.1-6 54 B 3.6.2-3 0 B 3.7.2-1 40 B 3.6.2-4 0 B 3.7.2-2 42 B 3.6.2-5 0 B 3.7.2-3 40 PALO VERDE UNITS 1, 2, AND 3 6 Revision 61 December 19' 2014 TECHNICAL SPECIFICATION BASES LIST OF EFFECTIVE PAGES Page Rev. 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0 56 48 61 61 56 18 19 27 19 56 56 0 54 0 56 0 58 58 58 0 0 56 0 0 56 Rev No. PALO VERDE UNITS 1, 2, AND 3 9 Revision 61 December 19, 2014 This page intentionally blank Boron Dilution Alarm System (BOAS) B 3.3.12 B 3.3 INSTRUMENTATION B 3.3.12 Boron Dilution Alarm System (BOAS) BASES BACKGROUND The Boron Dilution Alarm System (BOAS) alerts the operator of a boron dilution event in MODES 3; 4. 5 and 6. The boron dilution alarm is received at least 15 minutes prior to criticality in Modes 3-5 and at least 30 minutes prior to criticality in Mode 6 to all ow. the operator to terminate the boron dilution.

In MODES 1 and 2 protection for a boron dilution event is addressed by LCO 3.3.1, "Reactor Protective System (RPS) Instrumentation-Operating." In MODES 3 and 4 with the CEAs withdrawn.

LCO 3.3.2. "Reactor Protective System (RPS) Instrumentation-Shutdown." provides protection.

The BOAS utilizes two channels that monitor the startup channel heutron flux indications.

If the neutron flux signals increase to the calculated alarm setpoint a control room annunciation is received.

The*setpoint is automatically lowered to a fixed amount above the current flux level signal. The alarm setpoint will only follow decreasing or constant flux levels. not increasing levels. Two channels of BOAS must be OPERABLE to provide single failure protection and to facilitate detection of channel failure by providing CHANNEL CHECK capability.

APPLICABLE The BOAS channels are necessary to monitor core reactivity SAFETY ANALYSES changes. They are the primary means for detecting and triggering operator actions to respond to boron dilution events initiated.

from conditi.ons in which the RPS is not required to be.OPERABLE.

The OPERABILITY of BOAS channels is necessary to meet the assumptions of the safety analyses to mitigate the consequences of an inadvertent boron dilution event as described in the UFSAR. Chapter 15 (Ref. 1). The BOAS channels satisfy Criterion 3 of 10 CFR 50.36 (c)(2)(ii). (continued)

PALO VERDE UNITS 1.2.3 B 3.3.12-1 REVISION 15 BASES (continued)

LCO Boron Dilution Alarm System (BOAS) B 3.3.12 The LCO on the BOAS channels ensures that adequate information is available to mitigate the consequences of a boron dilution event. Alarm capability in the "at the controls area" of the Control Room is required for a BOAS channel to be considered operable.

Prompt RESET of the alarm is required to maintain operability.

A minimum of two BOAS channels are required to be OPERABLE.

Because the BOAS utilizes the excore startup channel instrumentation to provide the neutron flux signal. the ability of the excore startup channel to provide the neutron flux signal is also part of the OPERABILITY of the BOAS. (References B3.9.2, Actions A.1 and A.2.) APPLICABILITY . The BOAS must be OPERABLE in MODES 3, 4, 5 and 6 because the safety analysis assumes this alarm will be available in these MODES to alert the operator to take action to terminate the boron dilution.

In MODES 1 and 2. and in MODES 3, 4, and 5. with the RTCBs shut and the CEAs capable of withdrawal.

the logarithmic power monitoring channels are addressed as part of the RPS in LCO 3. 3 .1. "Reactor Protective System CRPS) Instrumentation

-Operating" and LCO 3.3.2. "Reactor Protective System CRPS)

Shutdown".

The requirements for source range neutron flux monitoring in MODE 6 are a.ddressed in LCO 3.9.2. "Nuclear Instrumentation." The excore startup channels provide neutron flux coverage extending an additional one to two decades below the logarithmic channels for use during shutdown and refueling, when neutron flux may be extremely low. The Applicability is. modified by a Note that the BOAS is required in MODE 3 within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> after the neutron flux is within the startup range following a reactor shutdown.

This allows the neutron flux level to decay to a level within the range of the excore startup channels and for the operator to initialize the BOAS. Neutron flux is defined to be within the startup range following a reactor shutdown when reactor power is 2E-6% NRTP or less. (continued)

PALO VERDE UNITS 1.2.3 B 3.3.12-2 REVISION 61 Spent Fuel Assembly Storage B 3.7.17 B 3.7 PLANT SYSTEMS B 3.7.17 Spent Fuel Assembly Storage BASES BACKGROUND The spent fuel storage is designed to store either new Cnonirradiated) nuclear fuel assemblies.

or burned (irradiated) fuel assemblies in a vertical configuration underwater.

The storage pool was originally designed to store up to 1329 fuel assemblies in a borated fuel storage mode. The current storage configuration.

which allows credit to be taken for boron concentration.

burnup. and decay time. and does not require neutron absorbing (boraflex) storage cans. provides for a maximum storage of 1209 fuel assemblies in a four-region configuration.

The design basis of the spent fuel cooling system. however. is to provide adequate cooling to the spent fuel during all operating conditions (including full core offload)*for only 1205 fuel assemblies CUFSAR section 9.1.3). Therefore.

an additional four spaces are mechanically blocked to limit the maximum number of fuel assemblies that may be stored in the spent fuel storage pool to 1205. Region 1 is comprised of two 9x8 storage racks and one 12x8 storage rack. Cell blocking devices are placed in every other storage cell location in Region 1 to maintain a four checkerboard configuration.

These cell blocking devices prevent inadvertent insertion of a fuel assembly into a cell that is not allowed to contain a fuel assembly.

Region 3 is comprised of three 9x8 storage racks and one 9x9 storage rack in Units 2 and 3. Region 3 is comprised of four I 9x8 storage racks and one 9x9 storage rack in Unit 1. Since fuel assemblies may be stored in every Region 3 cell location.

no cell blocking devices are installed in Region 3. Regions 2 and 4 are mixed and are comprised of seven 9x8 storage racks and three 12x8 storage racks in Units 2 and 3. Regions 2 and 4 are mixed and are comprised of six 9x8 storage I racks and three 12x8 storage racks in Unit 1. Regions 2 and 4 are mixed in a repeating 3x4 storage pattern in which of-twelve cell locations are designated Region 2 and of-twelve cell locations are designated Region 4 (see UFSAR Figures 9.1-7 and 9.1-7A). Since fuel assemblies may be stored in every Region 2 and Region 4 cell location.

no cell blocking devices are installed in Region 2 and Region 4. (continued)

PALO VERDE UNITS 1.2.3 B 3.7.17-1 REVISION 61 BASES Spent Fuel Assembly Storage B 3.7.17 BACKGROUND The spent fuel storage cells are installed in parallel rows (continued) with a nominal center-to-center spacing of 9.5 inches. This spacing, a minimum soluble boron concentration of 900 ppm. and the storage of fuel in the appropriate region based on assembly burnup in accordance with TS Figures 3.7.17-1.

3.7.17-2.

and 3.7.17-3 is sufficient to maintain a of for fuel of original maximum radially averaged enrichment of up to 4.80%. APPLICABLE The spent fuel storage pool is designed for non-SAFETY ANALYSES criticality by use of adequate spacing. credit for boron concentration.

and the storage of fuel in the appropriate region based on assembly burnup in accordance with TS Figures 3.7.17-1.

3.7.17-2.

and 3.7.17-3.

The design requirements related to criticality CTS 4.3.1.1) are keff < 1.0 assuming no credit for boron and keff 0.95 taking credit for soluble boron. The burnup versus enrichment requirements CTS Figures 3.7 .17-1. 3.7.17-2.

and 3.7.17-3) are developed assuming keff < 1.0 with no credit taken for so 1 ub 1 e boron. and that keff 0. 95 assuming a soluble boron concentration of 900 ppm and the most limiting single fuel mishandling The analysis of the reactivity effects of fuel storage in the spent fuel storage racks was performed by ABB-Combustion Engineering CCE) using the three-dimensional Monte Carlo code KENO-VA with the updated 44 group ENDF/8-5 neutron cross section library. The KENO code has been previously used by CE for the analysis of fuel rack reactivity and have been benchmarked against results from numerous critical experiments.

These experiments simulate the PVNGS fuel storage racks as realistically as possible with respect to parameters important to reactivity such as enrichment and assembly spacing. The modeling of Regions 2. 3. and 4 included several conservative assumptions.

These assumptions neglected the reactivity effects of poison shims in the assemblies and structural grids. These assumptions tend to increase the calculated effective multiplication factor Ckeff) of the racks. The stored fuel assemblies were modeled as CE 16x16 assemblies with a nominal pitch of 0.5065 inches between fuel rods. a fuel pellet diameter of 0.3255 inches. and a U0(2) density of 10.31 glee. (continued)

PALO VERDE UNITS 1.2.3 B 3.7.17-2 REVISION 3 DC Sources -Operating B 3.8.4 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.4 DC Sources -Operating BASES BACKGROUND The station 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 preferred AC vital instrument bus power (via inverters).

As required by 10 CFR 50. Appendix A. GDC 17 (Ref. 1). the 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 recommendations of Regulatory Guide 1.6 (Ref. 2) and IEEE-308 (Ref. 3). The 125 VDC electrical power system consists of two independent and redundant safety related Class 1E DC electrical power subsystems (Train A and Train B). Each subsystem consists of two 125 VDC batteries.

the associated battery charger(s) for each battery, and all the associated control equipment and interconnecting cabling. Each subsystem contains two DC power channels.

There are four channels designated as A and C for Train A. and B and D for Train B for each unit (See 3.8.4 LCD Bases section for detailed description).

Additionally there is one backup battery charger per subsystem.

which provides backup service in the event that the normal battery charger is out of service. If the backup battery charger is substituted for one of the normal battery chargers.

then the requirements of independence and redundancy between subsystems are maintained.

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 Train A and Train B 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 power the AC vital instrument buses. (continued)

PALO VERDE UNITS 1.2.3 B 3.8.4-1 REVISION 61 BASES BACKGROUND (continued)

DC Sources -Operating B 3.8.4 The DC power distribution system is described in more detail in the Bases for LCO 3.8.9, "Distribution Operating," and for LCO 3. 8.10, "Di stri buti on Systems -Shutdown." 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.

There is no sharing between redundant Class 1E subsystems, such as batteries, battery chargers, or distribution panels. Each battery has adequate storage capacity to meet the duty cycle(s) discussed in the UFSAR, 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. In addition, each DC electrical power subsystem contains a backup battery charger which is manually transferable to either channel of a subsystem.

The transfer mechanism is mechanically interlocked to prevent both DC channels of a subsystem from being simultaneously*connected to the backup battery charger. The batteries for Train A and Train B DC electrical power subsystems are sized to produce required capacity at 80% of nameplate rating. The minimum design voltage limit is determined for each train per Reference

13. The battery cells are of flooded lead acid construction with a nominal specific gravity of 1.215 +/- 0.010. This specific gravity corresponds to an open circuit battery voltage of approximately 123 V for 60 cell battery (i.e., cell voltage of 2.07 volts per cell CVpc) at the upper range of the specific gravity) (Refs. 14 and 15). The open circuit voltage is the voltage maintained where there is no charging or discharging.

Optimal long term performance is obtained by maintaining a float voltage 2.17 to 2.25 Vpc. This provides adequate over-potential, which limits the formation of lead sulfate and self discharge.

The nominal float voltage of 2.25 Vpc corresponds to a total float voltage output of 135 V for a 60 cell battery as discussed in the UFSAR, Chapter 8 (Ref. 4). (continued)

PALO VERDE UNITS 1,2,3 B 3.8.4-2 REVISION 61 BASES BACKGROUND (continued)

DC Sources -Operating B 3.8.4 Each Train A and Train B 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 <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> while supplying normal steady state loads discussed in the UFSAR. 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 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.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. (continued)

PALO VERDE UNITS 1,2,3 B 3.8.4-3 REVISION 61 BASES DC Sources -Operating B 3.8.4 APPLICABLE The initial conditions of Design Basis Accident CDBA) and SAFETY ANALYSES transient analyses in the UFSAR. Chapter 6 (Ref. 6) and Chapter 15 (Ref. 7). assume that Engineered Safety Feature CESF) 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.

LCD 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).

The DC electrical power subsystems.

each subsystem consisting of two batteries.

battery charger for each battery (the backup battery charger. one per train. may be used to satisfy this requirement).

and the corresponding control equipment and interconnecting cabling supplying power to the associated bus within the subsystem 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 CAOO) or a postulated DBA. Loss of any DC electrical power subsystem does not prevent the minimum safety function from being performed (Ref. 4). Each DC electrical power subsystem (Train A or Train B) is subdivided into channels.

Train A consists of Channel A and Channel C. Train B consists of Channel B and Channel D. Channel A includes 125 VDC bus PKA-M41. 125 VDC battery bank PKA-F11. and normal battery charger PKA-H11 or backup battery charger PKA-H15. Channel C includes 125 VDC bus PKC-M43, 125 VDC battery bank PKC-F13. and normal battery charger PKC-H13 or backup battery charger PKA-H15. (continued)

PALO VERDE UNITS 1.2.3 B 3.8.4-4 REVISION 61 BASES LCO (continued)

APPLICABILITY ACTIONS DC Sources -Operating B 3.8.4 Channel B includes 125 VDC bus PKB-M42, 125 VDC battery bank PKB-F12, and normal battery charger PKB-H12 or backup battery charger PKB-H16. Channel D includes 125 VDC bus PKD-M44, 125 VDC battery bank PKD-F14, and normal battery charger PKD-H14 or backup battery charger PKB-H16. An OPERABLE DC electrical power subsystem requires all required batteries and respective chargers to be operating and connected to the associated DC bus(es). 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. and during movement of irradiated fuel assemblies are addressed in the Bases for LCO 3.8.5, "DC Sources-Shutdown." A.l. A.2, and A.3 Condition A represents one subsystem with one 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.l requires that the battery terminal voltage be restored to greater than or equal to the minimum established float voltage (2.17 volts per cell (Vpc) times the number of connected cells or 130.2 V for a 60 cell battery at the battery terminals) within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. This time provides for returning the inoperable charger to OPERABLE status or providing an alternate means of restoring 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 <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. the battery will be restored to its fully charged condition (continued)

PALO VERDE UNITS 1.2.3 B 3.8.4-5 REVISION 61 BASES ACTIONS (condition)

DC Sources -Operating B 3.8.4 (Required Action A.2) from fully charged condition any discharge that might have occurred due to the charger inoperability.

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 a good assurance of fully recharging the battery within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. avoiding a premature shutdown with its own attendant risk. If established battery terminal float voltage cannot be restored to greater than equal to the minimum established float voltage within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. 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 <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 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 <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> (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 is now fully capable of supplying the maximum expected load requirement.

The 2 amp value is based on returning the battery to 95% charge and assumes a 5% design margin for the battery. If at the expiration of the initial 12 hour1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> 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. (continued)

PALO VERDE UNITS 1.2.3 B 3.8.4-6 REVISION 61 BASES DC Sources -Operating B 3.8.4 ACTIONS Required Action A.3 limits the *restoration time for the (continued)

' inoperable battery charger to 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br />. 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. The backup class 1E charger is used to restore OPERABILITY as no balance of plant non-class 1E battery charger exists. The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> Completion Time reflects a reasonable time to effect restoration of the qualified battery charger to OPERABLE status. B.1 Condition B represents one subsystem with a loss of ability to completely respond to an event. and a potential loss of ability to remain energized during normal operation.

This condition is exclusive of the status of one battery charger. 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 <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> limit is consistent with the allowed time for an inoperable DC di stri buti on subsystem.

J If.one of the required DC electrical power subsystems is inoperable for reasons other than Condition A. the remaining I DC electrical power subsystem has the capacity to support a safe shutdown and to mitigate an accident condition.

Since a subsequent worst case single failure would, however. result in the complete loss of the remaining 125 VDC electrical power subsystem with attendant loss of ESF functions.

continued power operation should not exceed 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. The 2 hour2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> Completion Time is based on Regulatory Guide 1.93 (Ref. 8) 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)

PALO VERDE UNITS 1.2.3 B 3.8.4-7 REVISION 61 BASES ACTIONS (continued)

SURVEILLANCE REQUIREMENTS C.1 and C.2 DC Sources -Operating B 3.8.4 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 LCD does not apply. To achieve this status. the unit must be brought to at least MODE 3 within 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and to MODE 5 within 36 hours4.166667e-4 days <br />0.01 hours <br />5.952381e-5 weeks <br />1.3698e-5 months <br />. 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 unit systems. The Completion Time to bring the unit to MODE 5 is consistent with the time required in Regulatory Guide 1.93 (Ref. 8). SR 3.8.4.1 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 subsystem.

On float charge, battery cells will receive adequate current to optimally charge the battery. The voltage requirements are based on the nominal design voltage of the battery and are consistent with the mini mum float voltage established by the battery manufacturer (2.17 volts per cell (Vpc) times the number of connected cells or 130.2 V for a 60 cell battery at the battery terminals).

This voltage maintains the battery plates in a condition that supports maintaining the grid life. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. SR 3.8.4.2 Deleted SR 3.8.4.3 Deleted SR 3.8.4.4 and SR 3.8.4.5 Deleted (continued)

PALO VERDE UNITS 1.2.3 B 3.8.4-8 REVISION 61 BASES SURVEILLANCE REQUIREMENTS (continued)

SR 3.8.4.6 DC Sources -Operating B 3.8.4 This SR verifies the design capacity of the battery chargers.

According to Regulatory Guide 1.32 (Ref. 10). the battery charger supply is recommended to be based on the largest combined demands of the various steady state l o.ads 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 the required amps at* the minimum established float voltage for 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />. 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 maintained for at least 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. The other option requires that each battery charger be capable of recharging the battery after a service test coincident with supplying the largest coincident 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. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. SR 3.8.4.7 *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 Reference

4. (continued)

PALO VERDE UNITS 1.2.3 B 3.8.4-9 REVISION 61 BASES SURVEILLANCE REQUIREMENTS SR 3.8.4.7 (continued)

DC Sources -Operating B 3.8.4 The Surveillance Frequency is contra ll ed under the Surveillance Frequency Control Program. This SR is modified by two Notes. Note 1 allows the performance of a modified *performance discharge test in SR 3.8.6.9 in lieu of a service test since the modified performance discharge test parameters envelope the service test. The reason for Note 2 is that performing the Surveillance would perturb the electrical distribution system and challenge safety systems. SR 3.8.4.8 Deleted (continued)

PALO VERDE UNITS 1.2.3 B 3.8.4-10 REVISION 61 BASES REFERENCES

1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. PALO VERDE UNITS 1.2.3 DC Sources -Operating B 3.8.4 10 CFR.50. Appendix A. GDC 17. Regulatory Guide 1.6. March 10. 1971. IEEE-308-1974.

UFSAR. Chapter 8.3.2. Deleted UFSAR. Chapter 6. UFSAR. Chapter 15. Regulatory Guide 1.93. December 1974. Deleted Regulatory Guide 1.32. Revision 0. August 11. 1972. Deleted Deleted Calculations 01/02/03-EC-PK-0207 SDOC EN050B-A00024.

Installation.

Operation and Maintenance Manual for Class 1E Batteries and Racks. EPRI TR-100248, Rev 2. Stationary Battery Guide: Design, Application.

and Maintenance.

December 6. 2006. B 3.8.4-11 REVISION 61 This page intentionally blank 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 CDBA) and SAFETY ANALYSES transient analyses in the UFSAR. Chapter 6 (Ref. 1) and Chapter 15 (Ref. 2). assume that Engineered Safety Feature CESF) 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 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.

In general. when the unit is shut down. the Technical Specification requirements ensure that the unit has the capability to mitigate the consequences of postulated accidents.

However. assuming a single failure and concurrent loss of all offsite or all onsite power is not required.

The rationale for this is based on the fact that many Design Basis Accidents CDBAs) that are analyzed in (continued)

PALO VERDE UNITS 1.2.3 B 3.8.5-1 REVISION 1 BASES APPLICABLE SAFETY ANALYSES (continued)

LCD DC Sources -Shutdown B 3.8.5 MODES 1. 2. 3, and 4 have no specific analyses in MODES 5 and 6. Worst case bounding events are deemed not credible in MODES 5 and 6 because the energy contained within the reactor pressure boundary.

reactor coolant temperature and pressure.

and the corresponding stresses result in the probabilities of occurrence being significantly reduced or eliminated.

and minimal in consequences.

These deviations from DBA analysis assumptions and design requirements during shutdown conditions are allowed by the LCD for required systems. The DC sources support the equipment and instrumentation required to mitigate the Loss of Shutdown Cooling and Loss of RCS Inventory accidents analyzed in response to NRC Generic Letter 88-17 "Loss of Decay Heat Removal." The Generic Letter does not require the assumption of a single failure and concurrent loss of all offsite or all onsite power. The DC sources satisfy Criterion 3 of 10 CFR 50.36 (c)(2)(ii).

The DC electrical power subsystem as defined in this LCD consists of two batteries.

one battery charger per battery and the corresponding control equipment and interconnecting cabling within the subsystem.

The DC electrical power subsystem is required to ensure 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).

In Modes 5 and 6 and during movement of irradiated fuel assemblies.

one DC electrical power subsystem.

consisting of two batteries.

one battery charger per battery and the corresponding control equipment and interconnecting cabling within the train. is required to be OPERABLE to support the requirements of LCD 3.8.10 "Distribution Systems -Shutdown".

This DC electrical power subsystem also supports the one required OPERABLE Diesel Generator specified in LCD 3.8.2 "AC Sources-Shutdown" on the corresponding train. For situations where redundant trains of supported equipment are (continued)

PALO VERDE UNITS 1.2.3 B 3.8.5-2 REVISION 61 BASES LCO (continued)

APPLICABILITY . ACTIONS DC Sources -Shutdown B 3.8.5 required to be OPERABLE by LCO 3.8.10, the necessary DC buses of that additional DC distribution subsystem shall be energized by a mi ni.mum of its associ a ted battery charger or backup battery charger. Should the minimum battery charger requirements not be maintained for that additional DC distribution subsystem required by LCD 3.8.10. then LCO 3.8.10 (Condition

'A') would be applicable and not LCO 3.8.5. This is because the requirements of LCO 3.8.5 would still be met (i.e. one OPERABLE DC electrical power subsystem maintained).

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 needed to mitigate a fuel handling accident are available;

b. Required features necessary to mitigate the effects of events that can lead to core damage during shutdown are available; and c. Instrumentation and control capability is available for monitoring and maintaining the unit in a cold shutdown condition or refueling condition.

Movement of spent fuel casks containing irradiated fuel assemblies is not within the scope of the Applicability of this technical specification.

The movement of dry casks containing irradiated fuel assemblies will be done with a single-failure-proof handling system and with transport equipment that would prevent any credible accident that could result in a release of radioactivity.

The DC electrical power requirements for MODES 1. 2. 3. and 4 are covered in LCO 3.8.4 . The Actions are modified by a Note that identifies required Action A.2.3 is not applicable to the movement of irradiated I fuel assemblies in Modes 1 through 4. A.1. A.2.1, A.2.2, A.2.3, and A.2.4 If two 125 VDC subsystems buses are required to be energized per LCO 3.8.10. of the two required subsystems.

the (continued)

PALO VERDE UNITS 1.2.3 B 3.8.5-3 REVISION 61 BASES ACTIONS DC Sources -Shutdown B 3.8.5 A.1. A.2.1. A.2.2.

A.2.3. and A.2.4 (continued) remaining buses with DC power available may be capable of supporting sufficient systems to allow continuation of CORE ALTERATIONS and fuel movement.

By allowing the option to declare 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. For example. assume that the 'A' subsystem 125 VDC sources are required )o be OPERABLE per LCO 3.8.5. Also assume that two SOC are required to be OPERABLE and the corresponding 125VDC subsystem buses < energized (i.e. PK system buses 'A' and 'C' for subsystem . 'A' and buses 'B' and '0' for subsystem

'B') per LCO 3.8.10. Finally, assume that an electrical fault occurs on the PK system channel 'C' bus and the bus has been declared INOPERABLE.

The action of LCO 3.8.5 would allow declaring the corresponding SOC suction valve J-SIC-UV-653 INOPERABLE.

However the SOC system itself would not necessarily need to be declared INOPERABLE and this would allow CORE ALTERATIONS to continue.

However. 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). 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.

If moving irradiated fuel assemblies while in MODES 1. 2. 3, or 4. the fuel movement is independent of reactor operations.

Therefore.

inability to immediately suspend movement of irradiated fuel assemblies would not be sufficient reason to require a reactor shutdown.

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 subsystem 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 subsystem

• should be completed as quickly as possible in order to (continued)

I PALO VERDE UNITS 1.2.3 B 3.8.5-4 REVISION 61 BASES ACTIONS DC Sources -Shutdown B 3.8.5 A.1, A.2.1. A.2.2. A.2.3.

and A.2.4 (continued) minimize the time during which the unit safety systems may be without sufficient power. SURVEILLANCE SR 3.8.5.1 REQUIREMENTS REFERENCES R 3.8.5.1 states that Surveillances required by SR 3.8.4.1. 3.8.4.6 and 3.8.4.7 are applicable in these MODES. See the corresponding Bases for LCD 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 SRs. It is the intent that these SRs must still be capable of being met. but actual performance is not required.

1. UFSAR. Chapter 6. 2. UFSAR. Chapter 15. PALO VERDE UNITS 1.2.3 B 3.8.5-5 REVISION 61 This page intentionally blank Battery Parameters B 3.8.6 B 3.8 ELECTRICAL POWER SYSTEMS B 3.8.6 Battery Parameters BASES BACKGROUND This LCO delineates the limits on battery float current as well as electrolyte temperature.

level, and float voltage, for the DC 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 Maintenance Program also implements a program specified in Specification 5.5.19 for monitoring various battery parameters.

The battery cells are of flooded lead acid construction with a nominal specific gravity of 1.215 +/- 0.010. This specific gravity corresponds to an open circuit battery voltage of aQproximately 123 V for 60 cell battery (i.e .. cell voltage of 2.07 volts per cell (VQc) at the upper range of the specific gravity) (Refs. 6 and 7). The open circuit voltage is the voltage maintained when there is no charging or discharging.

Optimal long term performance is obtained by maintaining a float voltage 2.17 to 2.25 Vpc. This Qrovides adequate over-potential which limits the formation of lead sulfate and self discharge.

The nominal float voltage of 2.25 VQc corresponds to a total float voltage output of 135 V for a 60 cell battery as discussed in the UFSAR. Chapter 8 (Ref. 4). APPLICABLE The initial conditions of Design Basis Accident (DBA) and SAFETY ANALYSES transient analyses in the UFSAR. Chapter 6 (Ref. 1) and Chapter 15 (Ref. 2), assume 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 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 at least one subsystem of 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. (continued)

PALO VERDE UNITS 1.2.3 B 3.8.6-1 REVISION 61 BASES APPLICABLE SAFETY ANALYSES (continued)

LCD APPLICABILITY ACTIONS Battery Parameters B 3.8.6 Battery parameters satisfy Criterion 3 of 10 CFR 50.36 (c)(2)(ii).

Battery 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 (AOO) or a postulated DBA. Battery parameter limits are conservatively established.

allowing continued DC electrical system function even with limits not met. Train A batteries are composed of Channel A and Channel C batteries.

Train B batteries are composed of Channel B and Channel D batteries.

The battery parameters are required solely for the support of the associated DC electrical power subsystems.

Therefore.

battery parameter limits are only required when the DC power source is required to be OPERABLE.

Refer to the Applicability discussion in the Bases for LCD 3.8.4 and LCD 3.8.5. A.1. A.2.

and A.3 With one or more cells in one battery in one subsystem less than or equal to 2.07 V. the battery cell is degraded.

Within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> verification of the required battery charger OPERABILITY 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 3.8.6.4).

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 in one or more batteries less than or equal to 2.07 V. and continued operation is permitted for a limited period up to 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Since the Required Actions only specify "perform," a failure of SR 3.8.4.1 or SR 3.8.6.4 acceptance criteria does not result in this Required Action not met. However. if one of the SRs is failed the appropriate Condition(s).

depending on the cause of the failures.

is entered. If SR 3.8.6.4 is failed then there is no assurance that there is still sufficient battery capacity to perform the intended function and the battery must be declared inoperable immediately. (continued)

PALO VERDE UNITS 1.2.3 B 3.8.6-2 REVISION 61 BASES Battery Parameters B 3.8.6 ACTIONS B.1 and B.2 (continued)

One battery in one subsystem 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 <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 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 vol.tage (2.17 volts per cell CVpc) times the number of connected cells or 130.2 V for a 60 cell battery at the battery terminals) there are two possibilities.

the battery charger is inoperable or is operating in the current limit mode. Condition A addresses

• charger inoperability.

If the charger is operating in the current limit mode after 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> 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 <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> (Required Action B.2). The battery must therefore be declared inoperable.

If the float voltage is found to be satisfactory but there are one or more battery cells with float voltage less than or equal to 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 not cells less than or equal to 2.07 V there is a good assurance that. within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. the battery will be restored to its fully charged condition (Required Action B.2) from any discharge that might have occurred due to a 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 the previous discharge and the recharge characteristic of the battery. Thus there is a good assurance of fully recharging the battery within 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />. avoiding a premature shutdown with its own attendant risk. (continued)

PALO VERDE UNITS 1.2.3 B 3.8.6-3 REVISION 61 BASES ACTIONS B.1 and B.2 (continued)

Battery Parameters B 3.8.6 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 <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is reasonable time prior to declaring the battery inoperable.

Si nee Required Action B .1 only specifies "perform" a failure or 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 in one subsystem 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.

Condition C is modified by a Note specifying that Required Action C.2 shall be completed if electrolyte level was below the top of the plates. With electrolyte level b'e low 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 5.5.19, 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 <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> 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 5.5.19.b item to initiate action to equalize and test in accordance with manufacturer's recommendations are taken from 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 replaced. (continued)

PALO VERDE UNITS 1,2,3 B 3.8.6-4 REVISION 61 BASES Battery Parameters B 3.8.6 ACTIONS 0.1 (continued)

With one battery in one subsystem with pilot cell temperature less than the minimum established design limits. 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> is allowed to restore the temperature to within ' limits. 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 one or more batteries in redundant 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 their required function.

given that redundant batteries are involved.

With redundant batteries involved this potential could result in a total loss of function on multiple systems that rely upon 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 subsystem within 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />. F.1 With one battery with any battery cell parameters outside the 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 battery must be declared inoperable.

Additionally, discovering one or more batteries in one subsystem with one or more battery cells float voltage less than or equal to 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)

PALO VERDE UNITS 1,2,3 B 3.8.6-5 REVISION 61 BASES SURVEILLANCE SR 3.8.6.1 Deleted SR 3.8.6.2 Deleted SR 3.8.6.3 Deleted SR 3.8.6.4 Battery Parameters B 3.8.6 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 equipment used to monitor float current must have the necessary accuracy and capability to measure electrical currents in the expected range. The minimum required procedural time to measure battery float current will be 30 seconds or as recommended by the float current measurement instrument manufacturer.

This minimum float current measurement time is required to provide a more accurate battery float current reading. 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 Surveillance Frequency is controlled under the Surveillance Frequency Control Program. 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. (continued)

PALO VERDE UNITS 1.2.3 B 3.8.6-6 REVISION 61 BASES SURVEILLANCE REQUIREMENTS (continued)

Battery Parameters B 3.8.6 SR 3.8.6.5 and SR 3.8.6.8 Optimal long term battery performance is obtained by maintaining a float voltage greater than or equal to the minimum established design limits provided by the battery manufacturer.

which corresponds to 130.2 V at the battery terminals.

or 2.17 volts per cell (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 this range or less. but greater than 2. 07 Vpc. are addressed in Specification 5.5.19. SRs 3.8.6.5 and 3.8.6.8 require verification that the cell float voltages are greater than the short term abso*l ute mini mum voltage of 2. 07 V. Plant procedures must require verification of the selection of the pilot cell or cells when performihg SR 3.8.6.5. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. SR 3.8.6.6 The limit specified for electrolyte level ensures that the plates suffer no physical damage and maintains adequate electron transfer capability.

The minimum design electrolyte level is the minimum level indication mark on the battery cell jar.

• The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. SR 3.8.6.7 This Surveillance verifies that the pilot cell temperature is greater than or equal to the minimum established design limit (i.e .. 60°F). 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.

Battery room temperature must be routinely monitored such that a room temperature excursion could reasonably expect to be detected and corrected prior to the average battery (continued)

PALO VERDE UNITS 1.2.3 B 3.8.6-7 REVISION 61 BASES SURVEILLANCE REQUIREMENTS SR 3.8.6.7 (continued)

Battery Parameters B 3.8.6 electrolyte temperature dropping below the minimum electrolyte temperature.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. SR 3.8.6.9 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 3.8.6.9 however. only the modified performance discharge test may be used to satisfy the battery service test requirements of SR 3.8.4.7. A modified 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. It may consist of just two rates; for instance the one minute rate 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)

PALO VERDE UNITS 1.2.3 B 3.8.6-8 REVISION 61 BASES SURVEILLANCE REQUIREMENTS SR 3.8.6.7 (continued)

Battery Parameters B 3.8.6 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 ba.ttery rate of deterioration is increasing, even if there i.s 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 Survei ll a nee Frequency is contra ll ed under the Surveillance Frequency Control Program. If the battery shows degradation.

or if the battery has reached 85% of its expected life and capacity is < 100% of the manufacturer's rating, the Surveillance Frequency is reduced to 12 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 100% of the manufacturer's ratings. 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 10% below the manufacturer*

s rating .. These Frequencies are consistent with the recommendations in IEEE-450 (Ref. 3). 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. Credit may be taken for unplanned events that satisfy this SR. . * (continued)

PALO VERDE UNITS 1.2.3 B 3.8.6-9 REVISION 61

. I BASES REFERENCES

1. UFSAR. Chapter 6. 2. UFSAR. Chapter 15. 3. IEEE-450-2002

.. 4. UFSAR. Chapter 8. 5 IEEE-485-1983.

June 1983. Battery Parameters B 3.8.6 6. SDOC EN050B-A00024.

Installation.

Operation and Maintenance Manual for Class 1E Batteries and Racks. 7. EPRI TR-100248.

Rev. 2. Stationary Battery Guide: Design, Application.

and Maintenance.

December 6. 2006. PALO VERDE UNITS 1.2.3 B 3.8.6-10 REVISION 61 Nuclear Instrumentation B 3.9.2 B 3.9 REFUELING OPERATIONS B 3.9.2 Nuclear Instrumentation BASES BACKGROUND The Startup Channel Neutron Flux Monitors or Startup Range Monitors (SRMs) are used during core alterations or movement of irradiated fuel assemblies in containment to monitor the core reactivity condition.

The installed SRMs are part of the Excore Nuclear Instrumentation System. These detectors are located external to the reactor vessel and detect neutrons leaking from the core. The use of portable detectors is permitted.

provided the LCO requirements are met. The installed SRMs are BF3 detectors operating in the proportional region of the gas filled detector characteristic curve. The detectors monitor the neutron flux in counts per second. The instrument range covers five decades of neutron flux (1E+5 cps) with a 5% instrument accuracy.

The detectors also provide continuous visual indication in the control room and an audible indication in the control room and containment.

An audible BOAS alarm alerts operators to a possible dilution accident.

The excore startup channels are designed in accordance with the criteria presented in Reference

1. APPLICABLE Two OPERABLE SRMs and the associated BOAS are required to SAFETY ANALYSES provide a signal to alert the operator to unexpected changes in core reactivity from a boron dilution accident.

The safety analysis of the uncontrolled boron dilution accident is described in Reference

2. The analysis of the uncontrolled boron dilution accident shows that normally available reactor subcriticality would be reduced. but there is sufficient time for the operator to take corrective actions. LCO The SRMs satisfy Criterion 3 of 10 CFR 50.36 (c)(2)(ii).

This LCO requires two SRMs OPERABLE to ensure that redundant monitoring capability is available to detect changes in core reactivity. (continued)

PALO VERDE UNITS 1.2.3 B 3.9.2-1 REVISION 48 BASES LCO (continued)

APPLICABILITY ACTIONS Nuclear Instrumentation B 3.9.2 The SRMs include detectors.

preamps. amplifiers.

power supplies.

indicators.

recorders.

speakers.

alarms. switches and other components necessary to complete the SRM functions.

Specifically, each SRM must provide continuous visual indication in the Control Room and each SRM must have the capability to provide audible indication in both the Control Room and Containment via use of the Control Room switch. In MODE 6. the SRMs must be OPERABLE to determine changes in core reactivity.

There is no other direct means available to check core reactivity levels. The requirements for the associated Boron Dilution Alarm System (BOAS) operability in MODE 6 are contained in LCO 3.3.12. "Boron Dilution Alarm System." LCO 3.3.12 also covers SRM and BOAS operability requirements for MODES 3. 4 and 5. A.1 and A.2 With only one SRM OPERABLE.

redundancy has been lost. Since these instruments are the only direct means of monitoring core reactivity conditions.

CORE ALTERATIONS and positive reactivity additions must be suspended immediately.

Performance of Required Action A.1 shall not preclude completion of movement of a component to a safe position.

With one required SRM channel inoperable due to loss of its neutron flux indication function.

the associated BOAS is also inoperable.

If the SRM is inoperable strictly due to a loss of its audible indication function.

and the SRM is able to provide neutron flux indication signal to the associated BOAS. the BOAS channel can be considered OPERABLE.

With one required BOAS channel inoperable.

Action A.1 of LCO 3.3.12 requires the RCS boron concentration to be determined immediately and at the applicable monitoring frequency specified in the COLR Section 3.3.12 in order to satisfy the requirements of the inadvertent deboration safety analysis.

The monitoring frequency specified in the COLR ensures that a decrease in the boron concentration during a boron dilution event will be detected with sufficient time for termination of the event before the reactor achieves (continued)

PALO VERDE UNITS 1.2.3 B 3.9.2-2 REVISION 61 BASES ACTIONS SURVEILLANCE REQUIREMENTS A.1 and A.2 (continued)

Nuclear Instrumentation B 3.9.2 criticality.

The boron concentration measurement and the OPERABLE BOAS channel provide alternate methods of detection of boron dilution.

B.1 With no SRM OPERABLE.

action to restore a monitor to OPERABLE status shall be initiated immediately.

Once initiated.

action shall be continued until an SRM is restored to OPERABLE status. With no SRM OPERABLE.

there is no direct means of detecting changes in core reactivity.

However. since CORE ALTERATIONS and positive reactivity additions are not to be made. the core reactivity condition is stabilized until the SRMs are OPERABLE.

This stabilized condition is verified by performing Action B.1 of LCO 3.3.12 which requires RCS boron concentration to be determined by redundant methods immediately and at the monitoring frequency specified in the COLR Section 3.3.12. This action satisfies the requirements of the inadvertent deboration safety analysis.

RCS boron concentration sampling by redundant methods ensures a boron dilution will be detected with sufficient time to terminate the event before the reactor achieves criticality.

SR 3.9.2.1 SR 3.9.2.1 is the performance of a CHANNEL CHECK. which is a comparison of the parameter indicated on one channel to a similar parameter on other channels.

It is based on the assumption that the two indication channels should be consistent with core conditions.

Changes in fuel loading and core geometry can result in significant differences between source range channels.

but each channel should be consistent with its local conditions.

The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. (continued)

PALO VERDE UNITS 1.2.3 B 3.9.2-3 REVISION 61 BASES SURVEILLANCE REQUIREMENTS (continued)

REFERENCES SR 3.9.2.2 Nuclear Instrumentation B 3.9.2 SR 3.9.2.2 is the performance of a CHANNEL CALIBRATION.

This SR is modified by a Note stating that neutron detectors are excluded from the CHANNEL CALIBRATION.

The detectors are of simple construction. and any failures in the detectors will be apparent as change in channel output. The Surveillance verifies that the channel responds to a measured parameter within the necessary range and accuracy.

CHANNEL CALIBRATION leaves the channel adjusted to account for instrument drift between successive calibrations to ensure that the channel remains operational.

This SR is an extension of SR 3.3.12 for the Boron Dilution Alarm System CHANNEL CALIBRATION listed here because of its Applicability in these MODES. The Surveillance Frequency is controlled under the Surveillance Frequency Control Program. The CHANNEL CALIBRATION is normally performed during a plant outage, but can be performed with the reactor at power if detector curve determination is not performed.

Detector curve determination can only be performed under conditions that apply during a plant outage since the flux level needs to be at shutdown levels for detector energization.

1. 10 CFR 50, Appendix A. GDC 13. GDC 26. GDC 28. and GDC 29. 2. UFSAR. Section 15.4.6. PALO VERDE UNITS 1.2.3 B 3.9.2-4 REVISION 56