ML17298B604

Forwards Failure Modes & Effects Analyses Examining non-IE Power Sys That Isolates Control Solenoids for Loop Isolation Valves CHE-239 & CHE-240.Analysis Demonstrates That No Event Could Prevent Delivery of Auxiliary Pressurizer Spray

ML17298B604
Person / Time
Site:	Palo Verde
Issue date:	12/07/1984
From:	Van Brunt E ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	Knighton G Office of Nuclear Reactor Regulation
References
ANPP-31382-EEVB, NUDOCS 8412110110
Download: ML17298B604 (41)

Text

REGULAT INFORMATION DISTRIBUTION STEM (RIDS)

ACCESSION NBR e 841 FACI,L;STN 50 528 STN~50 529 STN 50 530

<<AUTH'AME VAN BRUNTrE,E, REG IP ~ NAME KNIGHTON r G ~ I'l Q 2110110 DOC ~ DATE+ 84/12/07 NOTARIZED:

YES Palo Verde Nuclear Stationr Unit lr Arizona Publi Palo Verde Nuclear Stationr Unit. 2r Arizona Publi Palo Verde Nuclear Stationr Unit 3r Ar izona Publi AUTHOR AFFILIATION Arizona Public Service Co.

RECIPIENT AFFILIATION Licensing Branch 3

DOCKET 05000528 05000529 05000530

SUBJECT:

Forwards failure modes L effects, analyses examining non-IE power sys that isolates control solenoids for Loop Isolation Valves CHE-239 L GHE-240,Analysis demonstrates that no event could prevent delivery of auxiliary pressurizer spray.

DISTRIBUTION CODE:

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PSAR/FSAR Amdts 8, Related Correspondence NOTES:Standardized plant.

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plant, Standardized plant ~

05000528 05000529 05000530 RECIPIENT IO CODE/NAME NRR/DL/ADL NRR L83 LA INTERNAL: ACRS (ll ELO/HDS3 IE/DEPER/EPB 36 IE/DQASIP/QA821 NRR/OE/AEAB NRR/OE/EHEB NRR/DE/GB 28 NRR/OE/I'ITEB 17 NRR/DE/SGE'8 25 NRR/DHFS/LQB 32 NRR/DL/SSPB NRR/OSI/ASB NRR/DS I'/CSB 09 NRR/DS I/METB 12 NRR/D AB 22 04 DOAMI/MI8 COPIES LTTR ENCL 1

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Arizona Public Service Company ANPP-31382-EEVB/WFQ/KLM December 7, 1984 Director of Nuclear Reactor Regulation Attention: Mr. George W. Knighton, Chief Licensing Branch No.

3 Division of Licensing U.S. Nuclear Regulatory Commission Washington, D.C.

20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2 and 3

Docket Nos. STN-50-528/529/530 Auxiliary Pressurizer Spray Modification File:

84-056-026; G.l.01.10

References:

(1) Letter to D.G. Eisenhut, NRC, from A.E. Scherer, C-E, dated September 18, 1984 (LD-84-051);

Subject:

CESSAR Confirmatory Issues 1

and 2.

(2) Letter to G.W. Knighton, NRC, from E.E.

Van Brunt, Jr.,

APS, dated October 25, 1984;

Subject:

Auxiliary Spray Modification.

Dear Mr. Knighton:

Conversations held with members of your staff have revealed a concern about the auxiliary pressurizer spray system modification.

Reference (1) commits to provide a valve in series with the existing loop charging valve (CH-240).

CH-240 and the new series valve (CH-239) are to be powered from non-Class IE buses.

These valves will fail closed on loss of power.

The concern specifically addresses insufficient information to determine that all possible fai lures or design basis

events, associated with the offsite power supply system and its associated non-Class IE buses, will result in a fail-safe (closed) condition such that the protective functions are performed.

The enclosed failure modes and effects analysis (FMEA) examines the non-IE dc power system that isolates the control solenoids for Loop Isolation Valves CHE-239 and CHE-240.

It demonstrates that there is no credible event that could prevent the delivery of auxiliary pressuri zer spray.

The analysis considered loss of power, grounding, short circuiting, overvoltage, undervoltage, loss of air, and a seismic event.

Due to spatial separation, a pipe break or a fire cannot defeat the ability of the system to close.

Refer to the PVNGS fire hazards analysis in FSAR Appendix 9B and the PVNGS spurious actuation analysis submitted by ANPP-31101, dated November 13, 1984.

Auxiliary pressuri zer spray has no safety function during a

LOCA and consequently LOCA effects were not analyzed.

84i2iiOiiO 84i207 PDR ADOCK 05000528 A

PDR

k

George W. Knig n

Auxiliary Pressurizer Spray Modification ANPP-31382 Page 2

If you should have any questions, please contact me.

Very trul you EEVBJr/KLM/no Attachments E.E.

Van Brunt, Jr.

APS Vice President Nuclear Production ANPP Project Director cc:

E.A. Licitra w/a R.P.

Zimmerman w/a A.C. Gehr w/a

r

'I

ANPP-31382

s STATE OF ARIZONA

')

) ss.

COUNTY OF MARICOPA)

I, Edwin E.

Van Brunt, Jr.,

represent that I am Vice President, Nuclear Production of Arizona Public Service

Company, that the 'foregoing document has been signed by me on behalf of Arizona Public Service Company with full authority to do so, that I have read such document and know its

contents, and that to the best of my knowledge and belief,'he statements made therein are true.

+Q l

Edwin E.

Van Brunt, Jr.

Sworn to'before me this 'k day of 1984.

(

Ify Commission Expires:

My Commission Expires April 6, 1987 Notary Public

ll

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FAILURE MODES AND,EFFECTS ANALYSIS (SHEET 1

OF 8)

ATTACHMENT 1 IDENTIFICATION NO COMPONENT NAME-COMPONENT FUNCTION FAILURE MODE EFFECT ON SUBSYSTEM EFFECT ON SYSTEM Unit Auxiliary Transformer (13-E-MAA-002) and ac Electrical Distribution System Supply 480V -power to the non-1E battery chargers Loss of power Loss of power to battery chargers No effect for approxi-mately two hours.

The battery provides power to the dc bus.

After two

hours, bus voltage drops and power is lost to the distribution panel Overvoltage None, battery chargers provide regulation None Battery Charger and Associat~()Circuit Breakers Supplies power to the non-1E bus Undervoltage Fails to provide dc power to bus None, battery chargers provide regulation Battery begins to discharge to sup-ply loads if swing battery charger unavailable None No effect for approx i-mately two hours.

'Ihe battery provides power to the dc bus.

After two

hours, bus voltage drops and power is lost to the distribution panel Swing Battery Charger Supplies power to the non-1E bus Fails to provide dc power to bus None, two normal battery chargers supply dc power None Battery (E-NKN-F17)

(13>>E-NKA-001)

Supplies power to the non-1E bus Fails to provide dc power Loss of standby power to the bus No effect.

'the batteries serve as the source of standby power to the bus.

The charger provides the dc power under normal conditions

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FAILURE NODES AND EFFECTS ANALYSIS (SHEET 2 OF 8)

IDENTIFICATION NO COMPONENT NAME COMPONENT FUNCTION FAILURE MODE EFFECT ON SUBSYSTEM EFFECT ON SYSTEM DC Bus (E-NKN-M45)

(13-E-NKA-001)

Distribution Panel Feeder Circuit Breaker (NC)

( 1 3-E-NKA-001 )

Undervoltage Provides protec-tion in case of fault and provides power during normal conditions Fails open Distributes power Fault to the non-1E bus Loss of dc power to distribution panel No effect until voltage drops below dropout voltage of CHE-PDY-240B and CHE-PDY-239B, then solenoids close Loss of dc power to distribution panel Valves CHE-239 and CHE-240 close, enabling auxiliary pressurizer spray Valves CHE-240 and CHE-239 close after vol-~

tage drops below dropout ~

voltage, enabling.

auxiliary pressurizer spray C

Valves CHE-239 and CHE-240 close, enabling auxiliary pressurizer spray Distribution Panel dc Bus

( 1 3<<E-N KA-004)

Distribution Panel Circuit Breaker D42-16 (13-E-NKA-004)

Distributes power to the non-1E loads Provides protec-tion in case of fault and provides power during normal conditions Fault Fails open Loss of dc power to distribution panel Loss of dc power to auxiliary relay cabinet Valves CHE-239 and CHE-240 close, enabling auxiliary pressurizer spray Valves CHE-239 and CHE-240 close, enabling auxiliary pressurizer spray

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IDENTIFICATION NO COMPONENT NAME COMPONENT FUNCTION FAILURE MODE EFFECT ON SUBSYSTEM EFFECT ON SYSTEM 10 Disconnect Switch DS-16-10 (13-E-CHB-052)

Disconnect Switch DS-16-14 (13-E-CHB-073)

Provides isolation for maintenance and provides power during normal conditions Provides isolation for maintenance and provides power during normal conditions Fails open Fails open Loss of dc power to CHE-PDY-240B Loss of dc power to CHE-PDY-239B Valve CHE-240 closes, enabling auxiliary pressurizer spray Valve CHE-239 closes, enabling auxiliary pressurizer spray Fuse CHF-51 (13-E-CHB-052)

Provides protec-tion in case of fault land provides power during normal conditions Fails open Loss of dc power Valve CHE-240 closes, to CHE-PDY-240B en'abling auxiliary pressurizer spray 12 Fuse CHF-73 (13-E-CHB-073)

Provides protec-tion in case of-fault and provides power during normal conditions Fails open Loss of dc power Valve CHE-239 closes, to CHE-PDY-239B enabling auxiliary pressurizer spray

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IDENTIFICATION NO.

COMPONENT NAME COMPONENT FUNCTION FAILURE MODE EFFECT ON SUBSYSTEM EFFECT ON SYSTEM 13 Cable (Schemes RC Provides power and RE)

(13-E-CHB-052)

Open circuit Ground Fault Cable conductor short Loss of dc power to CHE-PDY-240B Generate dc power to ground alarm Indicat~r)light failure a)

Valve CHE-240 closes, enabling auxiliary pressurizer spray None None 14 Cable (Schemes RC and -RD)

(13-E-CHB-073)

Provides power Open circuit Loss of dc power to CHE-PDY-239B Valve CHE-239 closes, enabling auxiliary pressurizer spray Ground Fault Generate dc power to ground alarm None Cable conductor short Indicat~r) light failure a)

None 15 Cable (Schemes RB and RD for CHE-240 and RG and RH for CHE<<239)

(13-E-CHB-052 and 13-E-CHB-073)

Provides power Open circuit Ground fault Cable conductor short Generate ground alarm None Incorrect (b)

None indicator light Loss of indicator None lights

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FAILURE NODES AND EFFECTS ANALYSIS (SHEET 5 OF 8)

IDENTIFICATION -.

NO.

COMPONENT NAME COMPONENT FUNCTION FAILURE MODE EFFECT ON SUBSYSTEM EFFECT ON SYSTEM 16 Cable (Scheme RA)

Provides power (13>>E-CHB-052)

Open circuit Loss of dc power to CHE-PDY-240B Valve CHE-240 closes, enabling auxiliary pressurizer spray Ground fault Generate dc power to ground alarm None Cable conductor short Loss of dc powe~

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to CHE-PDY-240B Valve CHE-240 closes, enabling auxiliary pressurizer spray 17--

Cable (Scheme RA)

Provides power (13-E-CHB-073)

Open circuit Loss of dc power to CHE-PDY-239B Valve CHE-239 closes, enabling auxiliary pressurizer spray Ground fault Cable conductor short Generate dc power to ground alarm Loss of dc powe~

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to CHE-PDY-239B None Valve CHE-239 closes, enabling auxiliary pressurizer spray 18 Cable (Scheme RF)

Provides power (13-E-CHB-052)

Open circuit Ground fault Cable conductor short Loss of dc power to CHE-PDY-240B Generate dc power to ground alarm DC power provid~))

to CHE-PDY-240B Valve CHE-240 closes, enabling auxiliary pressurizer spray None Valve CHE-240 opens,

disabling-auxiliary pressurizer spray if CHE-239 is open; otherwise no effect

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FAILURE MODES AND EFFECTS ANALYSIS (SHEET 6 OF 8)

IDENTIFICATION KO COMPONENT NAME COMPONENT FUNCTION FAILURE MODE EFFECT ON SUBSYSTEM EFFECT ON SYSTEM 19 Cable (Scheme RE)

(13-E-CHB-073)

Provides power Open circuit Loss of dc power to CHE>>PDY-239B.

Valve CHE-239 closes, enabling auxiliar y pressurizer spray Ground fault Cable conductor short Generate dc power to ground alarm DC power provid~J) to CHE-PDY-239B None Valve CHE-239 opens, disabling auxiliary pressurizer-spray if CHE-240 is open; otherwise no effect 20 Switch (HS-240)

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CHE-239 is open; otherwise no effect 21 Switch (HS-239)

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IDENTIFICATION NO.

COMPONENT NAME COMPONENT FUNCTION FAILURE MODE EFFECT ON SUBSYSTEM EFFECT ON SYSTEM 22 Solenoid (CHE-PDY-240B)

(13-E-CHB-052)

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Arizona Public Service Company P.o. BOX 2I666 ~ PHOENIX, ARIZONA 65036 PVNGS-JRB-L84-896 October 10, 1984'ear Neighbor; As you are probably

aware, a siren alerting system is installed in the ten--

mile area around the Palo Verde Nuclear Generating Station. This siren system has been installed to notify you if there is ever an emergency at the Palo Verde Nuclear Generating Station. Although an emergency that might threaten your safety is extremel unlikel, the sirens are there to alert you to tune your radio to KTAR-620 AM, or another Emergency Broadcasting Station to listen for messages from Maricopa County. The Federal Emergency Management Agency requires that this siren system be tested each year. We will test the Palo Verde system two times in October. The first test will take place on Wednesda October 17

1984, at approxi-mately 12:00 Noon.

The sirens will sound on this day for about three minutes. The second test will be held on Wednesda October 24 1984, also at approxi-mately 12:00 Noon. The sirens will sound twice on that day. On both of the days,a random telephone survey will be done after the test to find out if residents heard the sirens. We want to be certain that you can hear the sirens. The sirens are set to operate for only a few minutes. If a siren near you continues to sound longer than ten minutes, please call 932-5300 or 386-6167 so that the siren's controls can be corrected. You can also call this number if you have any questions about the test. Thank you. Sincerely, o R. Bynum D'ctor of Nuclear Operations eg}}