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{{#Wiki_filter:N RC FORM 366. .(7 7h LICENSEE EVENT REPORT
{{#Wiki_filter:N RC FORM 366                                                                                                                         . .
*CONTROL BLOCK: l lllll Jh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6l V l A l N l A l S l 1 l@l 0l 0l -l 0l 0l 0l 0] 0l -l 0l 0 @l 4] 1l 1l 1] 1l@l llg o i?U 9 LICENSEE CODE 14:S LtCLNSE NUV:$EH 26 26 LICL%ti T YPE 30 SI LATbd CON'T lojij ,gCR L lg q 5l 0l 0l 0l 3l 3l 8lgl 0l 9l 1l 0l 7l 9l@l 0l 9[ 2l 4 7l 9 @
(7 7h
R 7 8 60 61 DOCKE T NUVdER 68 El EVENT OATE 74 75 REPOR T O ATE 80 EVENT DESCRIPTION AND PRGBABLE CONSEQUENCES h o 2l On September 10, 1979, during Mode 1 operation, Vepco discovered that ambient temperaq ture ranges could exist where the design capability of the diesel generator fan cool-o 3lj o l4 l l ing system would be exceeded and cooling may be insuf ficient.
* LICENSEE EVENT REPORT CONTROL BLOCK: l 1
Because temperature lexi;remes are not likely and the diesel generators have operated satisfactorily throug!}-
l      l    l    l    l Jh 6 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) o    i l V l LICENSEEA l NCODE    l A l S l 1:S l@l 0l 0l -lLtCLNSE            0l 0lNUV:$EH 0l 0] 0l -l 0l 0       26 @l   26 4] LICL%ti1l 1lT 1] YPE1l@l30 l
g3J lO 6l out the summer, the health and safety of the general public are not affected by this o 7l event.Reportable pursuant to T.S. 6.9.1.8.f. and i.
SI LATbd lg
l8 o 7 , 9 SYSTEM CAUSE CAUSE COY P.VALVE CODE CODE SU8 CODE COMPONENT CODE SU8 CODE SUBCODEl0l9ll El E @ g@ l Al h H . T , E i X i C f H Jh [X,_j @ @ h 7 8 9 10 11 12 13 la 1:d 20_SEQUEN TI AL OCCURRENCE REPORT REVISION L E R 'RO EVENT YEAR REPORT NO.
?         U 9                                           14 CON'T lojij 8
CODE TYPE NO.@ REPORT 7[ 9ll_ll 1l 1l 0 jfll0l1ll Tl__ll0_ 21 22 23 24 26??23 23 JJ 31 32 8 IT D F\8.S PtlE M AN 'F A TURER TAKE C O O PLANT ETH HOURS S I 9@lPl@l 2l@[ Zjg 0[ 0l 0l 0l l Ylgl Njg'l AlhlC l417 l0 i@
R
33 34 32 36 3/40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l 'Ihe cause of this problem is that the fan blades may not have the proper pitch setting gijil l to provide the necessary cooling for the wide range of temperatures that can occur lDiscussions with t'e vs.ndor are in progress to determine resolutiong
                        ,gCR             L lg q 5l 0l 0l 0l 3l 3l 8lgl                         68    El 0l 9l 1l 0l 7l 9l@l 0l 9[ 2l 4 7l 980 @
, , l during the year.
EVENT OATE             74       75       REPOR T O ATE 7                                    60          61              DOCKE T NUVdER EVENT DESCRIPTION AND PRGBABLE CONSEQUENCES h o   2      l On September 10, 1979, during Mode 1 operation, Vepco discovered that ambient temperaq o  3      l ture ranges could exist where the design capability of the diesel generator fan cool-j o l4 l l ing system would be exceeded and cooling may be insuf ficient.                                                                           Because temperature                     l g3J l                  exi;remes are not likely and the diesel generators have operated satisfactorily throug!}-
n[,;3l l to the cooling problem.
O  6      l out the summer, the health and safety of the general public are not affected by this o   7      l event.                 Reportable pursuant to T.S. 6.9.1.8.f. and i.                                                                                                     l 8
li l41 L I 7 8 9 80 ST S% POWER OTHER STAWS ISCOV RY DISCOVERY DESCRIPTION ih l 0l 8l
            , 9 o
[glNAllglAnalysis of Temperature ctslI1 lE i E'''""*A TIVITY CO TENT AMOUNT OF ACTIVITY @ l LOCATION OF RELEASE RE LE Au D OF RELEASE
7 SYSTEM               CAUSE         CAUSE                                                       COY P.           VALVE CODE                 CODE       SU8 CODE                 COMPONENT CODE                   SU8 CODE           SUBCODE l0l9l                                    l El E @ g@ l Al h 10                          12            13 H . T , E i X i C f H Jh [X,_j @ @ h la            1:d              20 7         8                           9                       11 SEQUEN TI AL                       OCCURRENCE             REPORT                       REVISION EVENT YEAR                               REPORT NO.                             CODE                 TYPE                           NO.
"^l IileI Ld @
L E R 'RO
zi@l"^?8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBFR TYPE DESCRIPTION
                @ REPORT                   7[ 9l              l_l          l 1l 1l 0                 jfl          l0l1l                    l Tl              __l        l0
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_ 21           22         23           24             26         ??           23       23             JJ             31           32 TAKE            C O            O PLANT                ETH                  HOURS            S 8 IT D       F   \       8.     S PtlE               M AN 'F A TURER I 9@lPl@
'moor, i 7 PE RSONNE L INJURIES NUM9FR DESCRIPTION
33            34 l32 2l@           [ Zjg 36            3/
[1 0. o i 01@l Ali a n ,, n -- -- -7 8 9 11 12 iu, i lgl3/e1i 80 f 2. t'LOSS OF OR DAMAGE TO FACILITY
0[ 0l 0l 0l 40 l Ylg 41 l Njg 'l Alh lC l417 l0 i@
'b_ h j [ (,1 rd l TYPE DESCPIFTION g.l1 9 7 8 9 10 go 7909270551 gg!'CelPgNe 104) N K?'i",'"i,ij ,s , ,?8 9 10 64 69 80 5 (703)894-5151 NAME OF PREPARER W. R.Ca rtwricht
42                   43               44               47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i   o l 'Ihe cause of this problem is that the fan blades may not have the proper pitch setting gijil l to provide the necessary cooling for the wide range of temperatures that can occur                                                                                                 l
'H ON E :  
      ,  , l during the year.                                  Discussions with t'e             n vs.ndor are in progress to determine resolutiong
-Virginia Electric and Power Company North Anna Power Station, Unit #1
[,;3l l to the cooling problem.
I li l41 L 7         8 9                                                                                                                                                                           80 ST         S             % POWER                       OTHER STAWS                 ISCOV RY                             DISCOVERY DESCRIPTION I1 lE i E
ih l '0l 8l "[gl"                            NA                      l    l gl          Analysis of Temperature                                 cts l
A TIVITY CO TENT RE LE Au D OF RELEASE                                                                                                    LOCATION OF RELEASE
                                                              "^AMOUNT                  OF ACTIVITY          "^           @l IileI8 Ld
  ?          9
                        @         10 zi@l   11                                         44           45                                                                             80 l
PERSONNEL EXPOSURES NUMBFR               TYPE           DESCRIPTION i 7
{0 iO [ Othdl                                             '                                                       moor, PE RSONNE L INJURIES NUM9FR               DESCRIPTION                                                                                           [
i a                                                            A                                                    n ,, n -                                                          l 1 0. o i 01@l12                                                                                                                    - -           - -
7       8 9                       11                                                                                         iu,       i lg      l    3    /e1i '
80 LOSS OF OR DAMAGE TO FACILITY                                                                                                                 f 2. t TYPE          DESCPIFTION                                                                              .        'b    _h        j [ (     ,1 rd lg 1  9                      l 7       8 9                 10                                                                                                                                                         go
              ,s gg!'CelPgNe                                                         7909270551                                            104) N K?'i",'"i,ij
  ?       8 9                 10                                                                                                                   64 69                               80 5 NAME OF PREPARER                     W. R. Ca rtwricht                                         'H ON E :               (703)894-5151
 
Virginia Electric and Power Company North Anna Power Station, Unit #1                          


==Attachment:==
==Attachment:==
Page 1 of 1 Docket No. 50-338 Report No. LER 79-110/01T-0 Description of Event On September 10, 1979, during normal operation at 86% power, Vepco discovered that there are possible periods during the year when ambient temperature ranges are such that the diesel generator fan cooling system design is inade-quate to provide sufficient cooling.
Page 1 of 1 Docket No. 50-338 Report No. LER 79-110/01T-0 Description of Event On September 10, 1979, during normal operation at 86% power, Vepco discovered that there are possible periods during the year when ambient temperature ranges are such that the diesel generator fan cooling system design is inade-quate to provide sufficient cooling. Additionally, it was discovered that procedures did not address the existing vendor requirement concerning seasonal temperature variations and the need to vary blade pitch accordingly.
Additionally, it was discovered that procedures did not address the existing vendor requirement concerning seasonal temperature variations and the need to vary blade pitch accordingly.
Probable Consequences of Occurrence At present, tempercture extremes are not likely to occur and also the emergency diesel generators have operated satisfactorily during the summer. As a result, the public health and safety have not been affected by this event. Unit 2 has identical diesel generators which possess the same cooling problem.
Probable Consequences of Occurrence At present, tempercture extremes are not likely to occur and also the emergency diesel generators have operated satisfactorily during the summer.
As a result, the public health and safety have not been affected by this event. Unit 2 has identical diesel generators which possess the same cooling problem.
Cause The cause of this problem is that the fan blade pitch settings may be inadequate to provide the necessary diesel generator cooling for the wide range of tempera-tures that ccn occur during the year.
Cause The cause of this problem is that the fan blade pitch settings may be inadequate to provide the necessary diesel generator cooling for the wide range of tempera-tures that ccn occur during the year.
Immediate Corrective Action Discussions with the vendor are being conducted to determine the actions necessary to correct the cooling problem.
Immediate Corrective Action Discussions with the   vendor are being conducted to determine the actions necessary to correct   the cooling problem. Changing the fan blade pitch settings and adding glycol to   the radiator is presently being investigated. Also, fan coupling redesign is   under review.
Changing the fan blade pitch settings and adding glycol to the radiator is presently being investigated. Also, fan coupling redesign is under review.
Scheduled Corrective Action To be determined by the discussions with the vendor.
Scheduled Corrective Action To be determined by the discussions with the vendor.
Actions Taken To Prevent Recurrence No further actions required.
Actions Taken To Prevent Recurrence No further actions required.
LERFOR:B2 1U43 049}}
LERFOR:B2 1U43 049}}

Latest revision as of 06:50, 2 February 2020

LER 79-110/01T-0:on 790910,noted Ambient Temp Gauges Could Affect Capability of Diesel Generator Fan Cooling Sys So That Insufficient Cooling Would Be Provided.Caused by Improper Pitch Setting on Fan Blade
ML19208C833
Person / Time
Site: North Anna Dominion icon.png
Issue date: 09/24/1979
From: Cartwright W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19208C826 List:
References
LER-79-110-01T, LER-79-110-1T, NUDOCS 7909270552
Download: ML19208C833 (2)
v • d • e


Text

N RC FORM 366 . .

(7 7h

  • LICENSEE EVENT REPORT CONTROL BLOCK: l 1

l l l l l Jh 6 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) o i l V l LICENSEEA l NCODE l A l S l 1:S l@l 0l 0l -lLtCLNSE 0l 0lNUV:$EH 0l 0] 0l -l 0l 0 26 @l 26 4] LICL%ti1l 1lT 1] YPE1l@l30 l

SI LATbd lg

? U 9 14 CON'T lojij 8

R

,gCR L lg q 5l 0l 0l 0l 3l 3l 8lgl 68 El 0l 9l 1l 0l 7l 9l@l 0l 9[ 2l 4 7l 980 @

EVENT OATE 74 75 REPOR T O ATE 7 60 61 DOCKE T NUVdER EVENT DESCRIPTION AND PRGBABLE CONSEQUENCES h o 2 l On September 10, 1979, during Mode 1 operation, Vepco discovered that ambient temperaq o 3 l ture ranges could exist where the design capability of the diesel generator fan cool-j o l4 l l ing system would be exceeded and cooling may be insuf ficient. Because temperature l g3J l exi;remes are not likely and the diesel generators have operated satisfactorily throug!}-

O 6 l out the summer, the health and safety of the general public are not affected by this o 7 l event. Reportable pursuant to T.S. 6.9.1.8.f. and i. l 8

, 9 o

7 SYSTEM CAUSE CAUSE COY P. VALVE CODE CODE SU8 CODE COMPONENT CODE SU8 CODE SUBCODE l0l9l l El E @ g@ l Al h 10 12 13 H . T , E i X i C f H Jh [X,_j @ @ h la 1:d 20 7 8 9 11 SEQUEN TI AL OCCURRENCE REPORT REVISION EVENT YEAR REPORT NO. CODE TYPE NO.

L E R 'RO

@ REPORT 7[ 9l l_l l 1l 1l 0 jfl l0l1l l Tl __l l0

_ 21 22 23 24 26  ?? 23 23 JJ 31 32 TAKE C O O PLANT ETH HOURS S 8 IT D F \ 8. S PtlE M AN 'F A TURER I 9@lPl@

33 34 l32 2l@ [ Zjg 36 3/

0[ 0l 0l 0l 40 l Ylg 41 l Njg 'l Alh lC l417 l0 i@

42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS i o l 'Ihe cause of this problem is that the fan blades may not have the proper pitch setting gijil l to provide the necessary cooling for the wide range of temperatures that can occur l

, , l during the year. Discussions with t'e n vs.ndor are in progress to determine resolutiong

[,;3l l to the cooling problem.

I li l41 L 7 8 9 80 ST S  % POWER OTHER STAWS ISCOV RY DISCOVERY DESCRIPTION I1 lE i E

ih l '0l 8l "[gl" NA l l gl Analysis of Temperature cts l

A TIVITY CO TENT RE LE Au D OF RELEASE LOCATION OF RELEASE

"^AMOUNT OF ACTIVITY "^ @l IileI8 Ld

? 9

@ 10 zi@l 11 44 45 80 l

PERSONNEL EXPOSURES NUMBFR TYPE DESCRIPTION i 7

{0 iO [ Othdl ' moor, PE RSONNE L INJURIES NUM9FR DESCRIPTION [

i a A n ,, n - l 1 0. o i 01@l12 - - - -

7 8 9 11 iu, i lg l 3 /e1i '

80 LOSS OF OR DAMAGE TO FACILITY f 2. t TYPE DESCPIFTION . 'b _h j [ ( ,1 rd lg 1 9 l 7 8 9 10 go

,s gg!'CelPgNe 7909270551 104) N K?'i",'"i,ij

? 8 9 10 64 69 80 5 NAME OF PREPARER W. R. Ca rtwricht 'H ON E : (703)894-5151

Virginia Electric and Power Company North Anna Power Station, Unit #1

Attachment:

Page 1 of 1 Docket No. 50-338 Report No. LER 79-110/01T-0 Description of Event On September 10, 1979, during normal operation at 86% power, Vepco discovered that there are possible periods during the year when ambient temperature ranges are such that the diesel generator fan cooling system design is inade-quate to provide sufficient cooling. Additionally, it was discovered that procedures did not address the existing vendor requirement concerning seasonal temperature variations and the need to vary blade pitch accordingly.

Probable Consequences of Occurrence At present, tempercture extremes are not likely to occur and also the emergency diesel generators have operated satisfactorily during the summer. As a result, the public health and safety have not been affected by this event. Unit 2 has identical diesel generators which possess the same cooling problem.

Cause The cause of this problem is that the fan blade pitch settings may be inadequate to provide the necessary diesel generator cooling for the wide range of tempera-tures that ccn occur during the year.

Immediate Corrective Action Discussions with the vendor are being conducted to determine the actions necessary to correct the cooling problem. Changing the fan blade pitch settings and adding glycol to the radiator is presently being investigated. Also, fan coupling redesign is under review.

Scheduled Corrective Action To be determined by the discussions with the vendor.

Actions Taken To Prevent Recurrence No further actions required.

LERFOR:B2 1U43 049

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