ML17306A389

Monthly Operating Repts for Dec 1991 for Palo Verde Nuclear Generating Station.W/920113 Ltr

ML17306A389
Person / Time
Site:	Palo Verde
Issue date:	12/31/1991
From:	Chavet K, James M. Levine ARIZONA PUBLIC SERVICE CO. (FORMERLY ARIZONA NUCLEAR
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
254-01878-JML-K, 254-1878-JML-K, NUDOCS 9201150137
Download: ML17306A389 (33)

Text

ACCELERATED DISjgUBUTION DEMONS~TION SYSTEM REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9201150137 DOC.DATE: 91/12/3 1 NOTARIZED: NO DOCKET FACIL:STN-50-528 Palo Verde Nuclear Station, Unit 1, Arizona Publi 05000528 STN-50-529 Palo Verde Nuclear Station, Unit 2, Arizona Publi 05000529 STN-50-530 Palo Verde Nuclear Station, Unit 3, Arizona Publi 05000530 AUTH. NAME AUTHOR AFFILIATION CHAVET,K.A. Arizona Public Service Co. (formerly Arizona Nuclear Power LEVINE,J.M. Arizona Public Service Co. (formerly Arizona Nuclear Power RECIP.NAME RECIPIENT AFFILIATION I

SUBJECT:

Monthly operating repts for Dec 1991 for Palo Verde Nuclear D Generating Station.W/920113 ltr.

DISTRIBUTION CODE: XE24D COPIES RECEIVED:LTR ENCL SIZE TITLE: Monthly Operating Report (per Tech Specs)

NOTES:STANDARDIZED PLANT 05000528A Standardized plant. 05000529 Standardized plant. 05000530 D RECIPIENT D COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL XD CODE/NAME LTTR ENCL PD5 LA 3 3 PD5 PD 1 . 1 TRAMMELL,C 1 1 THOMPSON,M 1 1 INTERNAL: ACRS 10 10 AEOD/DOA 1 1 AEOD/DSP/TPAB 1 1 NRR/DL~/&PER. 0 1 1 NRR/DOEA/OEAB 1 1 ~%GIFT LE>> 05 .1 1 RGN5 1 1 EXTERNAL: EGGG BRYCE,J.H 1 1 NRC PDR 1 1 NSIC 1 1 NOTES 1 1 D

D NOTE TO ALL "RIDS" RECIPIENTS:

PLEASE HELP US TO REDUCE WASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM P 1-37 (EXT. 20079) TO ELIMINATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON'T NEED!

TOTAL NUMBER OF COPIES REQUIRED: LTTR 26 ENCL 26

I

c.

Arizona Public Service Company PALO VERDE NUCLEAR GENERATING STATION P.O. BOX 52034 ~ PHOENIX, ARIZONA 85072-2034 JAMES M. LEVINE 254-01878-JML/KAC VICE PRESIDENT NUCLEAR PRODUCTION January 13, 1992 Docket Nos. STN 50-528/529/530 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Mail Station P1-37 Washington, D.C. 20555

Subject:

Palo Verde Nuclear Generating Station (PVNGS)

Units 1, 2, and 3 Monthly Operating Reports for December 1991 File: 92-024-404; 92-056-026 Attached are the Monthly Operating Reports for December. 1991, prepared and submitted pursuant to Specification 6.9.1.6 of Appendix A (Technical Specifications) to the PVNGS Units 1, 2, and 3 Operating Licenses. By copy of this letter, Arizona Public Service Company is also forwarding the Monthly Operating Reports to the Regional Administrator, NRC Region V.

If you have any (602) 340-4718.

questions, please contact Mr. Kent A. Chavet at Very truly yours, JML/KAC/kac Attachments cc: J. B. Martin (all w/attachments)

D. H. Coe A. C. Gehr A. H. Gutterman INPO Records Center Utility Data Institute

q2OS<so 9O>iOOOS28

'jPDR, PDOCK 0 @DR R

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NRC MONTHLY OPERATING REPORT DOCKET NO. 50-528 UNIT NAME PVNGS-1 DATE COMPLETED BY K.A Chavet OPERATING STATUS

1. Unit Name: Palo Verde Nuclear Generatin Station Unit 1

2. Reporting Period: December 1991

3. Licensed Thermal Power (MWt): 3800

4. Nameplate Rating (Gross MWe): 1403

5. Design Electrical Rating (Net MWe): 1220

6. Maximum Dependable Capacity (Gross MWe): 1303

7. Maximum Dependable Capacity (Net MWe): 1221

8. If Changes Occur In Capacity Ratings (Item Numbers 3 Through 7)

Since Last Report, Give Reasons: N A

9. Power Level to Which Restricted, If Any (Net MWe): None

10. Reasons For Restrictions, If Any: N A

'"~:.."."'!':':;<5@":,UNXTj"'1?kGENERATgNG!~SgATXSTXCBPjsjp4'~4'."<<'?~ "'..';'.;:,.Cmul'at'i v'el.";'.;

744 8,760 51,936

12. ".'<<l>> Hours;:!iR68c't'o'r'>/+a'si'jGxt'c5 'ca'3p'~@<?jj~~j>~pic,'.i';ij(.,'<~i'~". 744.0 7,598.9 29,059.1 (4'::::,'@';?:,'.:.jA?:<:!:..'"..4;g:: <"~?.":y~?.';.,-'j<4@$$ !.'.',:~g<g,!:::;g@q ?:?gg@'r',,':,5.+.'~gp@

13. "':!'?:Re'ac:t<<o<<x~4Ra5&r'v'e'::"':8hMd6w<<xi"aeiursy,c.'j<i::Ã4:::"i~44 0.0 0.0 0.0

14. F~< .'k~ou'5's;::,::;Ge<neXa toxk~wM;.<Ok>>;Lin'e<<s~",-?'-::5'~~',~??<?~@5k?p$ ",;- 744.0 7,568.5 28,322.1

15.  :,.;:~,'.$ 3n'it!",::,R686xv>, e(j8hv t'do/et <<Houx'sp~~~?'g~jg<>.'.,~(<kg~pp~@.',::,.', 0.0 0' 0.0

.?gc.:<<<4? '<<<t<<:;<< '~? '<?$ p<:.:?  ??y<<<<<<4?$ )<<@??;.'? q? 'y<q<<<<:.;:.;@<'<? g~g g<<<< '? '.g < <?? N~'g',

16.  ::~'::.'";Ci'o'j's'j!T'h'er'mal'jBn'erg? je'riei~ji'e6'<~'(NMH.')'i"',i..-:"'";:,.', 2,822,439 28,470,155 103,864,256

17.  ::;;~":.'Cro'ss',.,".:Fl'jitri'ca~1':,',>>",E'nergj'jj'Cfinerat'ed',(NMH')(i": 980,400 9,876,100 36,048,700

'.j':j,:jP ".>j(g?:;:(g?'<~:.'g@g?'?QgPg<i<>~+gh)<w?~<~x0Ppk< iggjg~gF)?~j+%<>P??kS@@)A?'.(

18. ),",.:',:.'He't;:."-,Electr'i'ca'1.'.:<R6'ei'jy>Cp'net'j"t'i6";.',:(HWH).".~a:;"';,. 928,678 9,312,140 33,824,792

19. 100.0% 86.4a 54.5%

20. 100.0% 86.4s 54.5%

21 ~g',Uni<>>;",.'Ca'j'i'i'i$j~:;:Fi iCii",,";:(Ui,:in'j~,"'.MDC:.;.',. 102.2% 87.la 53.3%

22 98.3S 83.7S 51.3%

23.  ::Pj:.Vn'it!!'Po'i,'c:e'O',.:; Outa'i;::';l'Ra 0.0s 2.8s 20.2%

24. Shutdowns Scheduled Over Next 6 Months (Type, Date and Duration of Each): Refuelin outa e Februar 15 1992 70 da s

25. If Shutdown At End of Report Period, Estimated Date of Start-up: N A Forecast Achieved INITIAL CRITICALITY ~05 85 05/525 85 INITIAL ELECTRICITY 06 85 06 10 85 COMMERCIAL OPERATION 11 85 01 28 86 1

I AC

AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-528 UNIT NAME PVNGS-1 DATE COMPLETED BY K.A. Chavet MONTH: December 1991 I

DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL 1245 1251 1246 18 1249 1246 19 1250 1244 20 1250 1252 21 1242 1254 22 1248 1253 23 1248 1252 24 1248 1251 25 1249 10 1248 26 1251 1250 27 1241 12 1252 28 1220 13 1252 29 1248 14 1250 30 1249 15 1251 31 1250 16 1251 2

f v

REFUELING INFORMATION DOCKET NO. 50-528 UNIT NAME PVNGS-1 DATE COMPLETED BY K.A. Chavet Scheduled date for next refueling shutdown.

02/15/92, 3rd refueling Scheduled date for restart following refueling.

04/26/92 Will refueling or resumption of operation thereafter require a Technical Specification change or other license amendment?

Yes. Figures 3.2-2 and 3.2-2A of the Technical Specifications will require revision to reflect different DNBR margin limits.

Scheduled date for submitting proposed licensing action and supporting information.

Information to support the revision to Figures 3.2-2 and 3.2-2A was submitted on 12/24/91.

Important Licensing considerations associated with refueling, e.g., new or different fuel design or supplier, unreviewed design or performance analysis methods, significant changes in fuel design, and new, operating procedures.

The Unit 1 Cycle 4 nuclear design was performed using the DIT, ROCS, and MC computer codes described in Topical Report CENPD-266-P-A with the improvements in anisotropic scattering, higher order interface currents, nodal expansion method, and assembly discontinuity factors. Biases and uncertainties used in the Unit 1 Cycle 4 analysis were established by comparing results obtained from analytical calculation with measured data to insure that 95/95 confidence limits are maintained in the safety analysis.

The number of fuel assemblies.

a) In the core. 241 b) In the spent fuel storage pool. 188 Licensed spent fuel storage capacity. 1329 Intended change in spent fuel storage capacity. None Projected date of last refueling that can be discharged to spent fuel storage pool assuming present capacity.

2004 (18 Month reloads and full core discharge capability).

3

SUMMARY

OF OPERATING EXPERIENCE FOR THE MONTH DOCKET NO. 50-528 UNIT NAME PVNGS-1 DATE'OMPLETED BY K A Chavet December 1991 4

12/01 0000 Unit began the month in Mode 1, 100% RX power.

12/31 2400 Ended the month in Mode 1, 100% RX power.

4

g SHUTDOWNS AND POWER REDUCTIONS December 1991 DOCKET NO 50-528 UNIT NAME PVNGS-1 DATE CV K.A. Chavet BY 'OMPLETED No. Date Type Outage Duration Hours Reason Method Shutting Down of Reactor LER No.

Code'ause System Component Codes and Corrective Action to Prevent Recurrence No reactor shutdowns or significant power reductions occurred during the month.

~F-Forced ~Reason: ~Method: 'Exhibit F- Instructions S-Scheduled A-Equipment Failure(Explain) 1-Manual for Preparation of the Data B-Maintenance or Test 2-Manual Scram Entry Sheets for Licensee C-Refueling 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuation from (NUREG 0161)

E-Operator Training & License Previous Month Examination 5-Reduction of 20% or F-Administrative Greater in the Past ~Exhibit H-Same Source G-Operational Error 24 Hours H-Other (Explain) 9-Other-(Explain) 5

~ C NRC MONTHLY OPERATING REPORT 0

DOCKET NO. 50-529 UNIT NAME PVNGS-2 DATE COMPLETED BY K.A. Chavet OPERATING STATUS

1. Unit Name: Palo Verde Nuclear Generatin Station Unit 2

2. Reporting Period: December 1991

3. Licensed Thermal Power (MWt): 3800

4. Nameplate Rating (Gross MWe): 1403

5. Design Electrical Rating (Net MWe): 1270

6. Maximum Dependable Capacity (Gross MWe): 1303

7. Maximum Dependable Capacity (Net MWe): 1221

8. If Changes Occur In Capacity Ratings (Item Numbers 3 Through 7)

Since Last Report, Give Reasons: N A

9. Power Level to Which Restricted, If Any (Net MWe): None

10. Reasons For Restrictions, If Any: N A gpss)j)$

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<<j 'j,",'.:.',::.;:$4!~~;::";UNX'lj)2'ENE>R'ATING@::STATISTICS;lkNS)!;.",x;:: ,,".j<Th))g,:Month;::",::,::: ',Yr:,',,'"',,jto'.<<'.Da t&)j m::;"',F<",GVihu'lat'ivxe,:;,;:;,:::,

744 8,760 46,320

P)H0Uxsc.

12 "Read;t'or,>j~kaskcsCNk:t4alN(y@>>~95m<)jYj:,","xc'cl)((j~jj!:. 0.0 6,718.5 31,345.8

.:',;,:;::.;R08'ctoxAjk08er'v64$ 8but'do<<Hit,:,,80Dxs';;;::;::~(gag;,',:;.;:.';:i;;;,;;:;::jg".; 0.0 0.0 0 14 il'i;.'H'fiji@'):~::C'e'ne'r'a,':t'i,i ';ii'i,!0 0.0 6,690.9 30,714.3 15 g!Un'ill .,Rip'eivy4'Sbut'db$ in';<ufo'uis)<<j:., 0.0 0.0 0 yg>yc ~g<zqcp.@ycq<:, pqycp.~ ~<,, a, c<<n,>g x~>;,pc<> o>y<<>;pc< y~<<p.~<<yx.cz>.gxcp:c+xg Zvxcccc;x 16  :;,;,:,'Groin~,;';ThermalPEnerg'y',"",G'i'n'i'ra;t'e'd,~ ('kiMH)P: 0 25,224,817 112,946,218 17 gj';.<~Crc',"ssi:;:El,'ec,t'r'ical(,Ene'i'.g<y'.-:;Ce'ner.'it'e'd,",(f1%'f),':...',j 0 8,778,500 39,406/070 18  ::.:x;~0e't@481'i5'o'tXica<14j'En<xe< j jy)Qkne ja tfj

gx Q':j(jMWH!)Zj'a@i% 0 8,265,186 36,890,215 19 1:"";'."cg~ngy;.;ST@.i.ce('.,Pa'c.tyre@('g'c).';~,;,:.((yg:s:.;.,4)F'.~g.;~>Y4k~.;,~xx>)~$ >~(l 0.0% 76.4a 66.3a 20 0.0s 76.4s 66.3s 21 0.0% 77.3% 65.2e 22 ':"Un'it&~Ckp<<a'ci<t'j:>FkctoiN~(Mi'ng','DEB!.'Ne,"t'):::i:;%~> 0.0a 74.3s 62.7s 23 ~":; lJn'i~'e 'Po'i'd'ed6'0'utc'a'~e""..'R'ate~"{ip.::,'":,.. $ ::::p~'!:; "::

>~~/":,:.,':::,':< 0.0s 3.5s 7.4s

24. Shutdowns Scheduled Over Next 6 Months (Type, Date and Duration of Each): Unit was shut down for refuelin outa e on October 17 1991.

25. If Shutdown At End of Report Period, Estimated Date of Start-up: Refuelin outa e ended on 1 8 92.

Forecast Achieved INITIAL CRITICALITY ~03 86 Ok/618 86 INITIAL ELECTRICITY ~06 86 05 20 86 COMMERCIAL OPERATION ~11 86 09 19 86 6

0 f

I

AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-529 UNIT NAME PVNGS-2 DATE COMPLETED BY K A Chavet MONTH: December 1991 DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL 17 18 19 20 21 22 23 24 25 10 26 27 12 28 13 29 14 30 15 16 7

REFUELING INFORMATION DOCKET NO. 50-529 UNIT NAME PVNGS-2 DATE COMPLETED BY K.A. Chavet Scheduled date for next refueling shutdown.

Unit was shut down on 10/17/91 for refueling.

Scheduled date for restart following refueling.

The refueling outage ended on 1/8/92.

Will refueling or resumption of operation thereafter require a Technical Specification change or other license amendment?

No. Analyses indicate that no proposed Technical Specification change or other license amendment will be required as a result of the next refueling.

Scheduled date for submitting proposed licensing action and supporting information.

N/A Important Licensing considerations associated with refueling, e.g., new or different fuel design or supplier, unreviewed design or performance analysis methods, significant changes in fuel design, and new operating procedures.

The Unit 2 Cycle 4 nuclear design was performed using the DIT, ROCS and MC computer codes described in Topical Report CENPD-266-P-A with improvements in anisotropic scattering, higher order interface currents, nodal expansion method and assembly discontinuity factors. The increased accuracy of the improved methodology was not credited in the safety analysis, as the larger of the uncertainties associated with the previous code versions and improved code versions was used. This approach yielded the most conservative results. The Unit 2 Cycle 4 reload is otherwise typical of other PVNGS cycles.

The number of fuel assemblies.

a) In the core. 241 b) In the spent fuel storage pool. 288 Licensed spent fuel storage capacity. 1329 Intended change in spent fuel storage capacity. None Projected date of last refueling that can be discharged to spent fuel storage pool assuming present capacity.

2004 (18 Month reloads and full core discharge capability).

8

I

SUMMARY

OF OPERATING EXPERIENCE FOR THE MONTH UNIT NAME PVNGS-2 DATE COMPLETED BY K A Chavet December 1991 12/01 0000 Began the month in Mode 6 with core reload in progress.

12/12 1831 Entered Mode 5.

12/31 0501 Entered Mode 4.

12/31 2400 Unit ended the month in Mode 4 with RCS heat-up to Mode 3 in progress.

9

I P

SHUTDOWNS AND POWER REDUCTIONS December 1991 DOCKET NO 50-529 UNIT NAME PVNGS-2 DATE COMPLETED BY K.A, Chavet Outage Method of Cause and Corrective Duration Shutting System Component Action to No. Date Type Hours Reason Down Reactor LER No. Code Code~ Prevent Recurrence 91-06 10/17/91 S 744.0 N/A N/A N/A Unit shut down for scheduled refueling outage.

~F-Forced ~Reason: ~Method: 4Exhibi t F- Ins true t ions S-Scheduled A-Equipment Failure(Explain) 1-Manual for Preparation of the Data B-Maintenance or Test 2-Manual Scram Entry Sheets for Licensee C-Refueling 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuation from (NUREG 0161)

E-Operator Training & License Previous Month Examination 5-Reduction of 20% or F-Administrative Greater in the Past ~Exhibit H-Same Source G-Operational Error 24 Hours H-Other (Explain) 9-Other-(Explain) 10-

NRC MONTHLY OPERATING REPORT DOCKET NO. 50-530 UNIT NAME PVNGS-3 DATE

• K OPERATING STATUS

1. Unit Name: Palo Verde Nuclear Generatin Station Unit 3 2.

3. Licensed Thermal Power (MWt): 3800

4. Nameplate Rating (Gross MWe): 1403

5. Design Electrical Rating (Net MWe): 1270

6. Maximum Dependable Capacity (Gross MWe): 1303

7. Maximum Dependable Capacity (Net MWe): 1221

8. If Changes Occur In Capacity Ratings (Item Numbers 3 Through 7)

Since Last Report, Give Reasons: N A

9. Power Level to Which Restricted, If Any (Net MWe): None

10. Reasons For Restrictions, If Any: N A

.::.~j~Yx:",',:.">>,':to~<<'Ba,te>'..,

g~~':qj,CUBI'a52v8:":::;-'4,896 744 8,760 12 ..48ouik<>R'e'ae:,tong:::va'ski,:Pt'ii'a1Ij;~~);.';;(Pa.'4eckhg'~.:!:,'l 744.0 6,418.0 23,997.7 13 .'-';::Reic!'or'"Re'si'r'v'eg:8hu'0'log4'i",,:Bou'rs:~',,.',;,:::-",j 0.0 0.0 0.0

.""":,':,:NI.-,"-".:,",,",'!::.::,Hop'is~~Ceriera:iii'jyak 14 'On:;,'::Li'net)~:,';.:.';:4ij",:.,';:i,.;'i,",:'," k~j 744.0 6,276.2 23,599.4 15 N:-.',".:::U)'l't',,::iRe'i')re;:',":Shi"tdbei~jHouri",$-',-.",,':>:,:,'i~jgj'.'I:~)j".:j3N.'".i>"'a 0.0 0.0 0.0 16 ,;'i~;,;Ci<',sic, T'he'rmal)'~Bri'iijj.'.:,Cene'r'a'ted;;:'",.,'(liWHI)I4'.""':.";:3 2,813,447 22,905,182 86,511,409

17.  ::,":,::::,G'ross!,::Elean'ii'ial)jgii'e'xjy..,"'Cen'exjoe'd:.:,:!:,:(MWH);.-.;.!'.:.". 992,700 8,010,400 30,318,700 18 938,700 7,518,450 28,517,925 19  :"'QniO':::8'exvfce.'.:::.:Pactox'aq(%):::::::"c""j'""">'~""'<P 100.0% 71 '% 67.6%

""'"'""""""'""':Uni~t'<::Av@ikabi'liCQ~Pac45L""'"(%

20 ) '-'~""4'l::.Ng."e';:":e.:',~ 100.0% 71.6% 67.6%

21 ':':::::Unit:: Chyleeye;:":Paster@!gVrkng':-'MDC:.::.Net) .';."~!-:<:': 103.3% 70.3% 66.9%

22 .:';:':,:Uii'i 99.3% 67.6% 64.3%

23  :/Unt,:.::Poice'd.':<gute'jap::.:.Rite",::!;,(%) l!:,'jgj.,':,:::;;:,gK@",;;:.;::;:!-:::;:.-:: 0.0% 10.4% 9.2%

25. If Shutdown At End of Report Period, Estimated Date of Start-up: N A Forecast Achieved INITIAL CRITICALITY ~07 8 ~10 25 8 INITIAL ELECTRICITY ~07 87 11 28 87 COMMERCIAL OPERATION ~09 87 01 08 88 11

t I AVERAGE DAILY UNIT POWER LEVEL DOCKET NO. 50-530 UNIT NAME PVNGS-3 DATE COMPLETED BY K A Chavet MONTH: December 1991 DAY AVERAGE DAILY POWER LEVEL DAY AVERAGE DAILY POWER LEVEL 1109 17 1268 1262 18 1266 12 0 19 1269 2 1 20 1271 1270 1269 1269 22 1269 1269 23 1270 26 24 68 1265 25 1269 10 1264 26 1269 1266 27 1260 12 1270 28 1241 13 1271 29 1267 14 1272 30 1268 15 1270 31 1271 16 1268

It E>>

~ ~

~ ~ ~ REFUELING INFORMATION DOCKET NO. 50-530 UNIT NAME PVNGS-3 DATE COMPLETED BY K A Chavet Scheduled date for next refueling shutdown.

09/15/92, 3rd refueling Scheduled date for restart following refueling.

11/14/92 Will refueling or resumption of operation thereafter require a Technical Specification change or other license amendment?

The need for a Technical Specification change or other license amendment has not yet been determined.

Scheduled date for submitting proposed licensing action and supporting information.

N/A Important Licensing considerations associated with refueling, e.g., new or different fuel design or supplier, unreviewed design or performance analysis methods, significant changes in fuel design, and new operating procedures.

A Technical Specification change request was submitted to the NRC on December 20, 1991 to allow the use of advanced zircaloy-based cladding alloys instead of Zircaloy-4 on up to 80 fuel rods in two fuel assemblies.

The number of fuel assemblies.

a) In the core. 241 b) In the spent fuel storage pool. 192 Licensed spent fuel storage capacity. 13 9 Intended change in spent fuel storage capacity. None Projected date of last refueling that can be discharged to spent fuel storage pool assuming present capacity.

2005 (18 Month reloads and full core discharge capability).

13

~ ~

L ~

t I

SUMMARY

OF OPERATING EXPERIENCE FOR THE MONTH DOCKET NO. 50-530 UNIT NAME PVNGS-3 DATE COMPLETED BY K A. Chavet December 1991 12/01 0000 Unit began the month in Mode 1; 70% RX power.

12/01 1709 RX power at 100%.

12/31 2400 Ended the month in Mode 1; 100% RX power.

14

~ ~

SHUTDOWNS AND POWER REDUCTIONS December 1991 DOCKET NO 50-530 UNIT NAME PVNGS-3 DATE COMPLETED BY K.A. Chavet No. Date Type Outage Duration Hours Reason Method Down of Shutting Reactor LER No.

Code'ause System Component Code~

and Corrective Action to Prevent Recurrence No reactor shutdowns or significant power reductions occurred during the month.

~F- Forced ~Reason: ~Method: 4Exhibit F-Instructions S-Scheduled A-Equipment Failure(Explain) 1-Manual for Preparation of the Data B-Maintenance or Test 2-Manual Scram Entry Sheets for Licensee C-Refueling 3-Automatic Scram Event Report (LER) File D-Regulatory Restriction 4-Continuation from (NUREG 0161)

E-Operator Training & License Previous Month Examination 5-Reduction of 20% or F-Administrative Greater in the Past ~Exhibit H-Same Source G-Operational Error 24 Hours H-Other (Explain) 9-Other-(Explain)

- 15