ML20207N272: Difference between revisions

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=Text=
=Text=
{{#Wiki_filter:-  -
{{#Wiki_filter:-
    .                                                                                      /).
/).
  *-  8"
!roa UNITED STATES 8"
        !roa N                                   UNITED STATES NUCLEAR REGULATORY COMMISSION N                                       WASHINGTON. D. C. 20555 e           .*
N NUCLEAR REGULATORY COMMISSION N
        %*****/                                           m' -
WASHINGTON. D. C. 20555 e
JAN 12 ..._                 AE00/C605 MEMORANDUM FOR:         Eric S. Beckjord, Director Office of Nuclear Regulatory Research Thomas E. Murley, Regional Administrator, Region I J. Nelson Grace, Regional Administrator, Region II James G. Keppler, Regional Administrator, Region III             i Robert D. Martin, Regional Administrator, Region IV John B. Martin, Regional Administrator, Region V FROM:                   C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data
%*****/
JAN 12..._ -
m' AE00/C605 MEMORANDUM FOR:
Eric S. Beckjord, Director Office of Nuclear Regulatory Research Thomas E. Murley, Regional Administrator, Region I J. Nelson Grace, Regional Administrator, Region II James G. Keppler, Regional Administrator, Region III i
Robert D. Martin, Regional Administrator, Region IV John B. Martin, Regional Administrator, Region V FROM:
C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data


==SUBJECT:==
==SUBJECT:==
CASE STUDY REPORT - OPERATIONAL EXPERIENCE INVOLVING LOSSES OF ELECTRICAL INVERTERS
CASE STUDY REPORT - OPERATIONAL EXPERIENCE INVOLVING LOSSES OF ELECTRICAL INVERTERS
            -The Office for Analysis and Evaluation of Operational Data (AE0D) has finalized its case study report on operational experience involving losses of electrical inverters. The report addresses the peer review comments provided by NRR, RES, the Regions, INP0, and Brookhaven National Laboratory. The final report also includes a brief analysis and evaluation of inverter loss events that occurred in calendar year 1985 which was not included in the preliminary report. We have enclosed a copy of our final report for your information and use as you may deem appropriate.
-The Office for Analysis and Evaluation of Operational Data (AE0D) has finalized its case study report on operational experience involving losses of electrical inverters. The report addresses the peer review comments provided by NRR, RES, the Regions, INP0, and Brookhaven National Laboratory. The final report also includes a brief analysis and evaluation of inverter loss events that occurred in calendar year 1985 which was not included in the preliminary report. We have enclosed a copy of our final report for your information and use as you may deem appropriate.
The study was initiated based primarily on the observation of a lack of overall
The study was initiated based primarily on the observation of a lack of overall industry-wide improvement in the operational performance of safety and nonsafety-l related inverters. The study indicates that events involving inverter losses l
:            industry-wide improvement in the operational performance of safety and nonsafety-l           related inverters. The study indicates that events involving inverter losses l           raises two principal concerns: (1) increased frequency of plant transients, and l           (2) inoperable or improper functioning of both safety-related and other important plant equipment.
raises two principal concerns:
Based on a review of events which occurred during calendar years 198?, 1983, and 1984, the study concludes that a major contributing cause for inverter loss events is incompatibility between the actual equipment service conditions and the service conditions assumed in the design of these units. The two factors which appear to be dominant contributors to such failures are high ambient temperature and/or humidity within inverter enclosures and voltage spikes and perturbations at inverter terminals. The study notes that these two factors have potential common cause implications. Other contributing factors or causes are inadequate maintenance and testing procedures or inappropriate personnel actions. In addition, the study finds that technical specifications
(1) increased frequency of plant transients, and l
                                          ~
(2) inoperable or improper functioning of both safety-related and other important plant equipment.
          $$ #$kfI QQ12 PDR
Based on a review of events which occurred during calendar years 198?, 1983, and 1984, the study concludes that a major contributing cause for inverter loss events is incompatibility between the actual equipment service conditions and the service conditions assumed in the design of these units. The two factors which appear to be dominant contributors to such failures are high ambient temperature and/or humidity within inverter enclosures and voltage spikes and perturbations at inverter terminals. The study notes that these two factors have potential common cause implications. Other contributing factors or causes are inadequate maintenance and testing procedures or inappropriate personnel actions.
In addition, the study finds that technical specifications
$$ #$kfI QQ12
~
PDR


>                                                              that address inverters and/or attendant buses for comparable plant designs are not consistent. Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System (SSPS) should be reassessed for acceptability. The enclosed report contains specific recommendations to address the study's findings and conclusions. A separate memorandum is being sent to NRR and IE requesting consideration of these recommendations.
that address inverters and/or attendant buses for comparable plant designs are not consistent. Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System (SSPS) should be reassessed for acceptability. The enclosed report contains specific recommendations to address the study's findings and conclusions. A separate memorandum is being sent to NRR and IE requesting consideration of these recommendations.
If you have any questions regarding this report, please contact Frank Ashe of my staff. Mr. Ashe can be reached at 492-4442.
If you have any questions regarding this report, please contact Frank Ashe of my staff. Mr. Ashe can be reached at 492-4442.
capasi sened by
capasi sened by
Line 40: Line 49:


==Enclosure:==
==Enclosure:==
As stated cc w/ enclosure:
As stated cc w/ enclosure:
D. Ross, RES S. Aggarwal, RES S. Ebneter, RI C. Anderson, RI T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII D. Hunnicutt, RIV J. Crews, RV cc w/o enclosure:
D. Ross, RES S. Aggarwal, RES S. Ebneter, RI C. Anderson, RI T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII D. Hunnicutt, RIV J. Crews, RV cc w/o enclosure:
D. Humenansky, OCM Distribution:
D. Humenansky, OCM Distribution:
POR                     S. Rubin AE00 CF                 M. Chiramal AE0D SF                 F. Ashe ROAB CF                 M. Williams ROAB SF                 K. Black J. Heltemes             W. Lanning F. Hebdon
POR S. Rubin AE00 CF M. Chiramal AE0D SF F. Ashe ROAB CF M. Williams ROAB SF K. Black J. Heltemes W. Lanning F. Hebdon
          *See next' sheet for previous concurrence OFC : AEOD:ROAB : AE00:ROAB : AEOD:ROAB : AEO(:DD                       : AE0D:D       :          :
*See next' sheet for previous concurrence OFC : AEOD:ROAB : AE00:ROAB : AEOD:ROAB : AEO(:DD
_____:..._________:.____ ._____:___________.:____g.__.___:_.                   gg.._:.__________:.__________
: AE0D:D
NAME : FAshe:cg     : MChiramal : SRubin         :  FHebdon           : CJ. Itemes :            :
_____:..._________:.____._____:___________.:____g.__.___:_.
DATE : 12/ 10/86 * : 12/ 19/86 * : 12/ 19/86* : 12/31/86               : 12/3l/86     :          :
gg.._:.__________:.__________
OFFICIAL RECORD COPY
NAME : FAshe:cg
: MChiramal
: SRubin FHebdon
: CJ. Itemes :
DATE : 12/ 10/86 * : 12/ 19/86 * : 12/ 19/86* : 12/31/86
: 12/3l/86 OFFICIAL RECORD COPY


,              Multiple Addressees                                           which address inverters and/or attendant buses for comparable plant designs are not consistent. Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System should be reassessed for acceptability. The enclosed report contains specific recommendations to address the study's findings and conclu-sions. A separate memorandum is being sent to NRR and IE requesting considera-tion of these recommendations.
Multiple Addressees,
which address inverters and/or attendant buses for comparable plant designs are not consistent.
Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System should be reassessed for acceptability. The enclosed report contains specific recommendations to address the study's findings and conclu-sions. A separate memorandum is being sent to NRR and IE requesting considera-tion of these recommendations.
If you have any questions regarding this report, please contact Frank Ashe of my staff. Mr. Ashe can be reached at 492-4442.
If you have any questions regarding this report, please contact Frank Ashe of my staff. Mr. Ashe can be reached at 492-4442.
C. J. Heltemes, Jr. , Director Office for Analysis and Evaluation of Operational Data
C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data


==Enclosure:==
==Enclosure:==
As stated cc w/ enclosure:
As stated cc w/ enclosure:
D. Ross, RES S. Aggarwal, RES S. Ebneter, RI C. Anderson, RI T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII D. Hunnicutt, RIV J. Crews, RV cc w/o enclosure:
D. Ross, RES S. Aggarwal, RES S. Ebneter, RI C. Anderson, RI T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII D. Hunnicutt, RIV J. Crews, RV cc w/o enclosure:
D. Humenansky, OCM l
D. Humenansky, OCM l
Distribution:           e PDR                         S. Rubin AE0D CF                     M. Chiramal AE00 SF                     F. Ashe ROAB CF                     M. Williams ROAB SF                     K. Black J. Heltemes                 W. Lanning F. Hebdon 0FC     : AEOD:ROAB : AEOD:ROAB :               AEOD:ROAB : AE00:DD       : AE00:D     :            :
Distribution:
_ _ _ _ _ : _ _ .L A t . . _ _ _ :         k, NAME : FAshe:cg                 : MChiramal :              : FHebdon     : CJHeltemes :
e PDR S. Rubin AE0D CF M. Chiramal AE00 SF F. Ashe ROAB CF M. Williams ROAB SF K. Black J. Heltemes W. Lanning F. Hebdon 0FC
SRubink:___________:..._________:_______
: AEOD:ROAB : AEOD:ROAB
DATE : 12/4 /86                 : 12/11/86
: AEOD:ROAB : AE00:DD
: 12/N/86     : 12/ /86 : 12/ /86 :                  :
: AE00:D
0FFICIAL RECORD COPY
_ _ _ _ _ : _ _.L A t.. _ _ _ :
k, SRubink:___________:..._________:_______
NAME : FAshe:cg
: MChiramal
: FHebdon
: CJHeltemes :
12/N/86 DATE : 12/4 /86
: 12/11/86
: 12/ /86
: 12/ /86 0FFICIAL RECORD COPY


gllS AE0D/C605 MEMORANDUM FOR:       Eric S. Beckjord, Director Office of Nuclear Regulatory Research Thomas E. Murley, Regional Administrator, Region I J. Nelson Grace, Regional Administrator, Region II James G. Keppler, Regional Administrator, Region III Robert D. Martin, Regional Administrator, Region IV John B. Martin, Regional Administrator, Region V FROM:                 C. J. Heltemes, Jr. , Director Office for Analysis and Evaluation of Operational Data
gllS AE0D/C605 MEMORANDUM FOR:
Eric S. Beckjord, Director Office of Nuclear Regulatory Research Thomas E. Murley, Regional Administrator, Region I J. Nelson Grace, Regional Administrator, Region II James G. Keppler, Regional Administrator, Region III Robert D. Martin, Regional Administrator, Region IV John B. Martin, Regional Administrator, Region V FROM:
C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data


==SUBJECT:==
==SUBJECT:==
CASE STUDY REPORT - OPERATIONAL EXPERIENCE INVOLVING LOSSES OF ELECTRICAL INVERTERS The Office for Analysis and Evaluation of Operational Data (AE0D) has finalized its case study report on operational experience involving losses of electrical inverters. The report addresses the peer review comments provided by NRR, RES, the Regions, INPO, and Brookhaven National Laboratory. The final report also includes a brief analysis and evaluation of inverter loss events that occurred in calendar year 1985 which was not included in the preliminary report. We have enclosed a copy of our final report for your information and use as you may deem appropriate.
CASE STUDY REPORT - OPERATIONAL EXPERIENCE INVOLVING LOSSES OF ELECTRICAL INVERTERS The Office for Analysis and Evaluation of Operational Data (AE0D) has finalized its case study report on operational experience involving losses of electrical inverters. The report addresses the peer review comments provided by NRR, RES, the Regions, INPO, and Brookhaven National Laboratory. The final report also includes a brief analysis and evaluation of inverter loss events that occurred in calendar year 1985 which was not included in the preliminary report. We have enclosed a copy of our final report for your information and use as you may deem appropriate.
The study was initiated based primarily on the observation of a lack of overall industry-wide improvement in the operational performance of safety and nonsafety-related inverters. The study indicates that events involving inverter losses raises-two principal concerns: (1) increased frequency of plant transients, and (2) inoperable or improper functioning of both safety-related and other important plant equipment.
The study was initiated based primarily on the observation of a lack of overall industry-wide improvement in the operational performance of safety and nonsafety-related inverters. The study indicates that events involving inverter losses raises-two principal concerns:
Based on a review of events which occurred during calendar years 1982, 1983, and 1984, the study concludes that a major contributing cause for inverter loss events is incompatibility between the actual equipment service conditions and the service conditions assumed in the design of these units. The two factors which appear to be dominant contributors to such failures are high
(1) increased frequency of plant transients, and (2) inoperable or improper functioning of both safety-related and other important plant equipment.
, ambient temperature and/or humidity within inverter enclosures and voltage i spikes and perturbations at inverter terminals. The study notes that these two factors have potential common cause implications. Other contributing factors or causes are inadequate maintenance and testing procedures or inappropriate personnel actions. In addition, the study finds that technical specifications
Based on a review of events which occurred during calendar years 1982, 1983, and 1984, the study concludes that a major contributing cause for inverter loss events is incompatibility between the actual equipment service conditions and the service conditions assumed in the design of these units. The two factors which appear to be dominant contributors to such failures are high ambient temperature and/or humidity within inverter enclosures and voltage i
spikes and perturbations at inverter terminals. The study notes that these two factors have potential common cause implications. Other contributing factors or causes are inadequate maintenance and testing procedures or inappropriate personnel actions.
In addition, the study finds that technical specifications


k 2
k 2
that address inverters and/or attendant buses for comparable plant designs are not consistent. Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System (SSPS) should be reassessed for acceptability. The enclosed report contains specific recommendations to address the study's findings and conclusions. A separate memorandum is being sent to NRR and IE requesting consideration of these recommendations.
that address inverters and/or attendant buses for comparable plant designs are not consistent.
If you have any questions regarding this report, please contact Frank Ashe of my staff. Mr. Ashe can be reached at 492 4442.                                 ,
Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System (SSPS) should be reassessed for acceptability. The enclosed report contains specific recommendations to address the study's findings and conclusions. A separate memorandum is being sent to NRR and IE requesting consideration of these recommendations.
If you have any questions regarding this report, please contact Frank Ashe of my staff. Mr. Ashe can be reached at 492 4442.
s ow senedtw C.J. Mensmos,Jr.
s ow senedtw C.J. Mensmos,Jr.
C. J. Heltemes, Jr. , Director Office for Analysis and Evaluation of Operational Data
C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data


==Enclosure:==
==Enclosure:==
As stated cc w/ enclosure:
As stated cc w/ enclosure:
D. Ross, RES S. Aggarwal, RES S. Ebneter, RI C. Anderson, RI T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII                                                             ''
D. Ross, RES S. Aggarwal, RES S. Ebneter, RI C. Anderson, RI T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII D. Hunnicutt, RIV J. Crews, RV cc w/o enclosure:
D. Hunnicutt, RIV J. Crews, RV cc w/o enclosure:
D. Humenansky, OCM Distribution:
D. Humenansky, OCM Distribution:                                                                               ,
PDR S. Rubin AE00 CF M. Chiramal AE0D SF F. Ashe ROAB CF M. Williams ROAB SF K. Black J. Heltemes W. Lanning F. Hebdon
PDR                   S. Rubin AE00 CF               M. Chiramal AE0D SF               F. Ashe ROAB CF               M. Williams ROAB SF               K. Black J. Heltemes           W. Lanning F. Hebdon
*See next' sheet for previous concurrence OFC : AEOD:ROAB
          *See next' sheet for previous concurrence OFC : AEOD:ROAB     : AE00:ROAB : AEOD:ROAB : AE0 :DD         : AE00:0       :              :
: AE00:ROAB
____ :....__......:.... _______._______. ___..... ______.__            gr..._:......______:.______....
: AEOD:ROAB : AE0 :DD
NAME : FAshe:cg     : MChiramal :  SRubin     :  FH don       : CJ ltemes :                :
: AE00:0 gr..._:......______:.______....
DATE : 12/ 18/86 * : 12/ 19/86* : 12/ 19 / 86* : 12/31/86       : 12/3 l'86   :              :
NAME : FAshe:cg
: MChiramal SRubin FH don
: CJ ltemes :
DATE : 12/ 18/86 * : 12/ 19/86* : 12/ 19 86* : 12/31/86
: 12/3 l'86
/
OFFICIAL RECORD COPY
OFFICIAL RECORD COPY


Multiple Addrasstes                                                 -2 which address inverters and/or attendant buses for comparable plant'de igns are not consistent. Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System should be reassessed for acceptability. T_he enclosed report contains specific recommendations to address the study's findings and conclu-sions. A separate memorandum is being sent to NRR and IE/ requesting considera-tion of these recommendations.
Multiple Addrasstes
If you have any questions regarding this report,                                                       se contactplea Frank
-2 which address inverters and/or attendant buses for comparable plant'de igns are not consistent. Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System should be reassessed for acceptability. T_he enclosed report contains specific recommendations to address the study's findings and conclu-sions. A separate memorandum is being sent to NRR and IE/ requesting considera-tion of these recommendations.
                                                                                                                                      /    Ashe of my staff. Mr. Ashe can be reached at 492-4442.                                                   '
If you have any questions regarding this report, plea /
                                                                                                  /
se contact Frank Ashe of my staff. Mr. Ashe can be reached at 492-4442.
C. J[ Heltemes, Jr. , Director Office for Analysis and Evaluation
/
                                                                                            /of Operational Data
C. J[ Heltemes, Jr., Director Office for Analysis and Evaluation
                                                                                        /
'/of Operational Data
/


==Enclosure:==
==Enclosure:==
j As stated                                                           j
j As stated j
                                                                                  /
/
CC W/ enclosure:                                                 /
CC W/ enclosure:
/
D. Ross, RES S. Aggarwal, RES S. Ebneter, RI
D. Ross, RES S. Aggarwal, RES S. Ebneter, RI
                                                                      /
/
C. Anderson, RI                                       /
C. Anderson, RI
T. Gibbons, RII                                     ,
/
D. Falconer, RII 4              C. Paperiello, RIII                           j' D. Hunnicutt, RIV                           /
T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII j'
J. Crews, RV                               ,'
4 D. Hunnicutt, RIV
cc w/o enclosure:                       /
/
J. Crews, RV cc w/o enclosure:
/
D. Humenansky, OCM /
D. Humenansky, OCM /
                                                    /
/
i                                                 /
i
/
Distribution:
Distribution:
PDR                                   S. Rubin AE0D CF         /                     M. Chiramal AE0D SF         /                     F. Ashe R0AB CF                               M. Williams R0AB SF                               K. Black J. Heltemes                           W. Lanning F. Hebdon OFC : AEOD:ROAB : AE00:ROAB : AE00:ROAB                                     : AEOD:DD           : AEOD:D
PDR S. Rubin AE0D CF
_____:...L As. ____:_________ b ,____________: ___________:____________::____________:___________                                           :
/
NAME : FAshe:cg        : MChiramal :                                              FHebdon        : CJHeltemes :                            :
M. Chiramal AE0D SF
/
F. Ashe R0AB CF M. Williams R0AB SF K. Black J. Heltemes W. Lanning F. Hebdon OFC
: AEOD:ROAB
: AE00:ROAB : AE00:ROAB
: AEOD:DD
: AEOD:D
_____:...L As. ____:_________ b,____________: ___________:____________::____________:___________
SRubin{:
SRubin{:
FHebdon
: CJHeltemes :
NAME : FAshe:cg
: MChiramal
_____:.___________:____________:___________d:____________:____________:____________:___________
_____:.___________:____________:___________d:____________:____________:____________:___________
~DATE : 12/4/86         : 12/ti/86
12/N/86
: 12/N/86             : 12/ /86           : 12/ /86                      :          :
~DATE : 12/4/86
0FFICIAL RECORD COPY
: 12/ti/86
            ..                  . _ _ _ _ _ _ - -                        ._- .              ...    . _ . . _ - - - . _ - - - -                    . _ - - - -}}
: 12/ /86
: 12/ /86 0FFICIAL RECORD COPY
_ - - - -}}

Latest revision as of 20:13, 6 December 2024

Discusses AEOD Case Study Rept, Operational Experience Involving Losses of Electrical Inverters. Incompatibility Between Actual Equipment Svc Conditions & Svc Conditions in Design of Units Contributed to Loss of Inverters
ML20207N272
Person / Time
Issue date: 01/12/1987
From: Heltemes C
NRC OFFICE FOR ANALYSIS & EVALUATION OF OPERATIONAL DATA (AEOD)
To: Beckjord E, Grace J, Murley T
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I), NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II), NRC OFFICE OF NUCLEAR REGULATORY RESEARCH (RES)
Shared Package
ML18041A146 List:
References
AEOD-C605, NUDOCS 8701140091
Download: ML20207N272 (6)
v • d • e


Text

-

/).

!roa UNITED STATES 8"

N NUCLEAR REGULATORY COMMISSION N

WASHINGTON. D. C. 20555 e

%*****/

JAN 12..._ -

m' AE00/C605 MEMORANDUM FOR:

Eric S. Beckjord, Director Office of Nuclear Regulatory Research Thomas E. Murley, Regional Administrator, Region I J. Nelson Grace, Regional Administrator, Region II James G. Keppler, Regional Administrator, Region III i

Robert D. Martin, Regional Administrator, Region IV John B. Martin, Regional Administrator, Region V FROM:

C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data

SUBJECT:

CASE STUDY REPORT - OPERATIONAL EXPERIENCE INVOLVING LOSSES OF ELECTRICAL INVERTERS

-The Office for Analysis and Evaluation of Operational Data (AE0D) has finalized its case study report on operational experience involving losses of electrical inverters. The report addresses the peer review comments provided by NRR, RES, the Regions, INP0, and Brookhaven National Laboratory. The final report also includes a brief analysis and evaluation of inverter loss events that occurred in calendar year 1985 which was not included in the preliminary report. We have enclosed a copy of our final report for your information and use as you may deem appropriate.

The study was initiated based primarily on the observation of a lack of overall industry-wide improvement in the operational performance of safety and nonsafety-l related inverters. The study indicates that events involving inverter losses l

raises two principal concerns:

(1) increased frequency of plant transients, and l

(2) inoperable or improper functioning of both safety-related and other important plant equipment.

Based on a review of events which occurred during calendar years 198?, 1983, and 1984, the study concludes that a major contributing cause for inverter loss events is incompatibility between the actual equipment service conditions and the service conditions assumed in the design of these units. The two factors which appear to be dominant contributors to such failures are high ambient temperature and/or humidity within inverter enclosures and voltage spikes and perturbations at inverter terminals. The study notes that these two factors have potential common cause implications. Other contributing factors or causes are inadequate maintenance and testing procedures or inappropriate personnel actions.

In addition, the study finds that technical specifications

$$ #$kfI QQ12

~

PDR

that address inverters and/or attendant buses for comparable plant designs are not consistent. Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System (SSPS) should be reassessed for acceptability. The enclosed report contains specific recommendations to address the study's findings and conclusions. A separate memorandum is being sent to NRR and IE requesting consideration of these recommendations.

If you have any questions regarding this report, please contact Frank Ashe of my staff. Mr. Ashe can be reached at 492-4442.

capasi sened by

c. J. Hemames,Jr.

C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data

Enclosure:

As stated cc w/ enclosure:

D. Ross, RES S. Aggarwal, RES S. Ebneter, RI C. Anderson, RI T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII D. Hunnicutt, RIV J. Crews, RV cc w/o enclosure:

D. Humenansky, OCM Distribution:

POR S. Rubin AE00 CF M. Chiramal AE0D SF F. Ashe ROAB CF M. Williams ROAB SF K. Black J. Heltemes W. Lanning F. Hebdon

  • See next' sheet for previous concurrence OFC : AEOD:ROAB : AE00:ROAB : AEOD:ROAB : AEO(:DD
AE0D:D

_____:..._________:.____._____:___________.:____g.__.___:_.

gg.._:.__________:.__________

NAME : FAshe:cg

MChiramal
SRubin FHebdon
CJ. Itemes :

DATE : 12/ 10/86 * : 12/ 19/86 * : 12/ 19/86* : 12/31/86

12/3l/86 OFFICIAL RECORD COPY

Multiple Addressees,

which address inverters and/or attendant buses for comparable plant designs are not consistent.

Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System should be reassessed for acceptability. The enclosed report contains specific recommendations to address the study's findings and conclu-sions. A separate memorandum is being sent to NRR and IE requesting considera-tion of these recommendations.

If you have any questions regarding this report, please contact Frank Ashe of my staff. Mr. Ashe can be reached at 492-4442.

C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data

Enclosure:

As stated cc w/ enclosure:

D. Ross, RES S. Aggarwal, RES S. Ebneter, RI C. Anderson, RI T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII D. Hunnicutt, RIV J. Crews, RV cc w/o enclosure:

D. Humenansky, OCM l

Distribution:

e PDR S. Rubin AE0D CF M. Chiramal AE00 SF F. Ashe ROAB CF M. Williams ROAB SF K. Black J. Heltemes W. Lanning F. Hebdon 0FC

AEOD:ROAB : AEOD:ROAB
AEOD:ROAB : AE00:DD
AE00:D

_ _ _ _ _ : _ _.L A t.. _ _ _ :

k, SRubink:___________:..._________:_______

NAME : FAshe:cg

MChiramal
FHebdon
CJHeltemes :

12/N/86 DATE : 12/4 /86

12/11/86
12/ /86
12/ /86 0FFICIAL RECORD COPY

gllS AE0D/C605 MEMORANDUM FOR:

Eric S. Beckjord, Director Office of Nuclear Regulatory Research Thomas E. Murley, Regional Administrator, Region I J. Nelson Grace, Regional Administrator, Region II James G. Keppler, Regional Administrator, Region III Robert D. Martin, Regional Administrator, Region IV John B. Martin, Regional Administrator, Region V FROM:

C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data

SUBJECT:

CASE STUDY REPORT - OPERATIONAL EXPERIENCE INVOLVING LOSSES OF ELECTRICAL INVERTERS The Office for Analysis and Evaluation of Operational Data (AE0D) has finalized its case study report on operational experience involving losses of electrical inverters. The report addresses the peer review comments provided by NRR, RES, the Regions, INPO, and Brookhaven National Laboratory. The final report also includes a brief analysis and evaluation of inverter loss events that occurred in calendar year 1985 which was not included in the preliminary report. We have enclosed a copy of our final report for your information and use as you may deem appropriate.

The study was initiated based primarily on the observation of a lack of overall industry-wide improvement in the operational performance of safety and nonsafety-related inverters. The study indicates that events involving inverter losses raises-two principal concerns:

(1) increased frequency of plant transients, and (2) inoperable or improper functioning of both safety-related and other important plant equipment.

Based on a review of events which occurred during calendar years 1982, 1983, and 1984, the study concludes that a major contributing cause for inverter loss events is incompatibility between the actual equipment service conditions and the service conditions assumed in the design of these units. The two factors which appear to be dominant contributors to such failures are high ambient temperature and/or humidity within inverter enclosures and voltage i

spikes and perturbations at inverter terminals. The study notes that these two factors have potential common cause implications. Other contributing factors or causes are inadequate maintenance and testing procedures or inappropriate personnel actions.

In addition, the study finds that technical specifications

k 2

that address inverters and/or attendant buses for comparable plant designs are not consistent.

Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System (SSPS) should be reassessed for acceptability. The enclosed report contains specific recommendations to address the study's findings and conclusions. A separate memorandum is being sent to NRR and IE requesting consideration of these recommendations.

If you have any questions regarding this report, please contact Frank Ashe of my staff. Mr. Ashe can be reached at 492 4442.

s ow senedtw C.J. Mensmos,Jr.

C. J. Heltemes, Jr., Director Office for Analysis and Evaluation of Operational Data

Enclosure:

As stated cc w/ enclosure:

D. Ross, RES S. Aggarwal, RES S. Ebneter, RI C. Anderson, RI T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII D. Hunnicutt, RIV J. Crews, RV cc w/o enclosure:

D. Humenansky, OCM Distribution:

PDR S. Rubin AE00 CF M. Chiramal AE0D SF F. Ashe ROAB CF M. Williams ROAB SF K. Black J. Heltemes W. Lanning F. Hebdon

  • See next' sheet for previous concurrence OFC : AEOD:ROAB
AE00:ROAB
AEOD:ROAB : AE0 :DD
AE00:0 gr..._:......______:.______....

NAME : FAshe:cg

MChiramal SRubin FH don
CJ ltemes :

DATE : 12/ 18/86 * : 12/ 19/86* : 12/ 19 86* : 12/31/86

12/3 l'86

/

OFFICIAL RECORD COPY

Multiple Addrasstes

-2 which address inverters and/or attendant buses for comparable plant'de igns are not consistent. Further, inverter-related operating experiences indicate that a portion of the electrical circuitry associated with the Westinghouse Reactor Protection System should be reassessed for acceptability. T_he enclosed report contains specific recommendations to address the study's findings and conclu-sions. A separate memorandum is being sent to NRR and IE/ requesting considera-tion of these recommendations.

If you have any questions regarding this report, plea /

se contact Frank Ashe of my staff. Mr. Ashe can be reached at 492-4442.

/

C. J[ Heltemes, Jr., Director Office for Analysis and Evaluation

'/of Operational Data

/

Enclosure:

j As stated j

/

CC W/ enclosure:

/

D. Ross, RES S. Aggarwal, RES S. Ebneter, RI

/

C. Anderson, RI

/

T. Gibbons, RII D. Falconer, RII C. Paperiello, RIII j'

4 D. Hunnicutt, RIV

/

J. Crews, RV cc w/o enclosure:

/

D. Humenansky, OCM /

/

i

/

Distribution:

PDR S. Rubin AE0D CF

/

M. Chiramal AE0D SF

/

F. Ashe R0AB CF M. Williams R0AB SF K. Black J. Heltemes W. Lanning F. Hebdon OFC

AEOD:ROAB
AE00:ROAB : AE00:ROAB
AEOD:DD
AEOD:D

_____:...L As. ____:_________ b,____________: ___________:____________::____________:___________

SRubin{:

FHebdon

CJHeltemes :

NAME : FAshe:cg

MChiramal

_____:.___________:____________:___________d:____________:____________:____________:___________

12/N/86

~DATE : 12/4/86

12/ti/86
12/ /86
12/ /86 0FFICIAL RECORD COPY

_ - - - -

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