ML20085F953: Difference between revisions

From kanterella
Jump to navigation Jump to search
(StriderTol Bot insert)
 
(StriderTol Bot change)
 
Line 17: Line 17:


=Text=
=Text=
{{#Wiki_filter:.  .                        o                                                   q N]                                                     J
{{#Wiki_filter:o q
                                                                                    /9%
N]
i consumers
J
                                                                                                    ) Power e=v< company y
/9%
gkgli)y           General Offices: 212 West Michigan Avenue. Jackson. Michegan 49201. Area Code S17 788-0550 May 16, 1974
consumers i
                                                                  / j.',     ID     ~'
) Power e=v< company gkgli)y y
                                                                    .%S l}s \{fY .gh p;
General Offices: 212 West Michigan Avenue. Jackson. Michegan 49201. Area Code S17 788-0550 May 16, 1974
(~/           oO'               pl
/ j.',
                                                                            ,v M_.         q
ID
                                                            ] 4''M #     .
~'
                                                                              ;.            L::
.%S l}s \\{fY.gh p;
(fg
(~/
                                                          \ . 0(C;
o O '
                                                                                '' s ,Q
M_.
                                                            \;s           o Mr. John F. O' Leary, Director
pl
                                                                \'//~ ,Of, I b6,N's           Re: Docket 50-255 Directorate of Licensing License DPR-20 US Atomic Energy Commission                                                           Palisades Plant Washington, DC 20545                                                                 A0-7-74
] 4''M #
,v q
L::
,Q (fg 0(C;
\\.
'' s
\\;s
\\'//~, f I b6,N's o
Re: Docket 50-255 Mr. John F. O' Leary, Director O,
License DPR-20 Directorate of Licensing US Atomic Energy Commission Palisades Plant Washington, DC 20545 A0-7-74


==Dear Mr. O' Leary:==
==Dear Mr. O' Leary:==
 
Abnormal Occurrence Report A0-7 *(4 is attached.
Abnormal Occurrence Report A0-7 *(4 is attached.                             It is described as a power supply failure to the reactor protective sys-tem trip unit.
It is described as a power supply failure to the reactor protective sys-tem trip unit.
Yours very truly, Ralph B. Sewell (Signed)
Yours very truly, Ralph B. Sewell (Signed)
RBS/ds                                       Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USAEC f
RBS/ds Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USAEC f
                                                                            \           ,
\\
                                                                                            ,"1 5 t      .h 1     ,t 8308230676 740516                                                               (
,"1 5
PDR ADOCK 05000255 S                  PDR
.h t
                                                                                        .)
1
CdPkb REGION       2
,t 8308230676 740516
(
PDR ADOCK 05000255
.)
S PDR CdPkb REGION 2


r~                                                                                                                       1
r~
                                                                                                                          )
1
    '            ~
)
O                                                O                l ABNORMAL OCCURRENCE REPORT Palisades Plant
O O
: 1.         Report Number:             74-7, Docket 50-255 2a.         Date: May 16, 1974 2b.         Occurrence Date: May 6, 1974
~
: 3.         Facility: Palisades Plant i                           h.         Identification of Occurrence: RPS Trip Unit Power Supply Failure 5         Conditions Prior to Occurrence: Refueling Shutdown                                 1
ABNORMAL OCCURRENCE REPORT Palisades Plant 1.
: 6.         Description of Occurrence: While reviewing monthly Technical Specifi-cations surveillance procedure MI-2, it was found that the low steam
Report Number:
!                                      generator pressure trip set point was less than the Technical Specifi-cations limit of 500 psi as specified in Table 2.3.1, Item 6.                   The limit was exceeded by 6.2 psia (0.025 MV).
74-7, Docket 50-255 2a.
7         Designation of Apparent Cause of the Occurrence: The 15 V d-c power supply 1hich provides trip unit isolation and d-c power failed causin- the trip point to be lower than the previously set trip point.
Date: May 16, 1974 2b.
Occurrence Date: May 6, 1974 3.
Facility: Palisades Plant i
h.
Identification of Occurrence: RPS Trip Unit Power Supply Failure 5
Conditions Prior to Occurrence: Refueling Shutdown 1
6.
Description of Occurrence: While reviewing monthly Technical Specifi-cations surveillance procedure MI-2, it was found that the low steam generator pressure trip set point was less than the Technical Specifi-cations limit of 500 psi as specified in Table 2.3.1, Item 6.
The limit was exceeded by 6.2 psia (0.025 MV).
7 Designation of Apparent Cause of the Occurrence: The 15 V d-c power supply 1hich provides trip unit isolation and d-c power failed causin-the trip point to be lower than the previously set trip point.
)
)
: 8.         Analysis of Occurrence: This type equipment failure is normal and
8.
;                                      expected due to nonpermanent nature of filter capacitors. The system J
Analysis of Occurrence: This type equipment failure is normal and expected due to nonpermanent nature of filter capacitors. The system J
was designed (2 of 4 logic) to allow for these type failures and is monitored on a frequent interval to detect such failures. Only one of the four channels was affected by this failure.
was designed (2 of 4 logic) to allow for these type failures and is monitored on a frequent interval to detect such failures. Only one of the four channels was affected by this failure.
9         Corrective Action: Replaced the power supply with a spare module and j                                     readjusted the trip unit to proper set point.
9 Corrective Action: Replaced the power supply with a spare module and j
: 10.         Failure Data: This is the fourth failure of the forty-four 15 V power supplies in service at the Palisades Plant. Failures occurred on 1-19-70, 7-16-70, 2-27-72 and 5-6-74. The first two failures were returned to Windsor at Combustion Engineering request. No failure analysis was given. The third and fourth failures will be analyzed on site when time permits. Symptoms on the last two failures were dis-similar thus leading to the .lonclusion that the failures are not of a generic nature.
readjusted the trip unit to proper set point.
Manufacturers Identification: Dynage 700-262, Serial Number 6960
10.
                                          . , , . - -    . . - .      -,    . - , - . , n-.,- , , ---,.  .
Failure Data: This is the fourth failure of the forty-four 15 V power supplies in service at the Palisades Plant. Failures occurred on 1-19-70, 7-16-70, 2-27-72 and 5-6-74.
                                                                                                              , - - -}}
The first two failures were returned to Windsor at Combustion Engineering request. No failure analysis was given. The third and fourth failures will be analyzed on site when time permits. Symptoms on the last two failures were dis-similar thus leading to the.lonclusion that the failures are not of a generic nature.
Manufacturers Identification: Dynage 700-262, Serial Number 6960 n-.,-,, ---,.
, - - -}}

Latest revision as of 03:32, 14 December 2024

AO AO-7-74:on 740506,low Steam Generator Pressure Trip Setpoint Found to Be Less than Tech Spec Limit While Reviewing Monthly Tech Spec Surveillance Procedure MI-2. Caused by 15-volt Dc Power Supply & Dc Power Failure
ML20085F953
Person / Time
Site: Palisades Entergy icon.png
Issue date: 05/16/1974
From: Sewell R
CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
To: Oleary J
US ATOMIC ENERGY COMMISSION (AEC)
Shared Package
ML20085F956 List:
References
AO-7-74, NUDOCS 8308230676
Download: ML20085F953 (2)
v • d • e


Text

o q

N]

J

/9%

consumers i

) Power e=v< company gkgli)y y

General Offices: 212 West Michigan Avenue. Jackson. Michegan 49201. Area Code S17 788-0550 May 16, 1974

/ j.',

ID

~'

.%S l}s \\{fY.gh p;

(~/

o O '

M_.

pl

] 4M #

,v q

L::

,Q (fg 0(C;

\\.

s

\\;s

\\'//~, f I b6,N's o

Re: Docket 50-255 Mr. John F. O' Leary, Director O,

License DPR-20 Directorate of Licensing US Atomic Energy Commission Palisades Plant Washington, DC 20545 A0-7-74

Dear Mr. O' Leary:

Abnormal Occurrence Report A0-7 *(4 is attached.

It is described as a power supply failure to the reactor protective sys-tem trip unit.

Yours very truly, Ralph B. Sewell (Signed)

RBS/ds Ralph B. Sewell Nuclear Licensing Administrator CC: JGKeppler, USAEC f

\\

,"1 5

.h t

1

,t 8308230676 740516

(

PDR ADOCK 05000255

.)

S PDR CdPkb REGION 2

r~

1

)

O O

~

ABNORMAL OCCURRENCE REPORT Palisades Plant 1.

Report Number:

74-7, Docket 50-255 2a.

Date: May 16, 1974 2b.

Occurrence Date: May 6, 1974 3.

Facility: Palisades Plant i

h.

Identification of Occurrence: RPS Trip Unit Power Supply Failure 5

Conditions Prior to Occurrence: Refueling Shutdown 1

6.

Description of Occurrence: While reviewing monthly Technical Specifi-cations surveillance procedure MI-2, it was found that the low steam generator pressure trip set point was less than the Technical Specifi-cations limit of 500 psi as specified in Table 2.3.1, Item 6.

The limit was exceeded by 6.2 psia (0.025 MV).

7 Designation of Apparent Cause of the Occurrence: The 15 V d-c power supply 1hich provides trip unit isolation and d-c power failed causin-the trip point to be lower than the previously set trip point.

)

8.

Analysis of Occurrence: This type equipment failure is normal and expected due to nonpermanent nature of filter capacitors. The system J

was designed (2 of 4 logic) to allow for these type failures and is monitored on a frequent interval to detect such failures. Only one of the four channels was affected by this failure.

9 Corrective Action: Replaced the power supply with a spare module and j

readjusted the trip unit to proper set point.

10.

Failure Data: This is the fourth failure of the forty-four 15 V power supplies in service at the Palisades Plant. Failures occurred on 1-19-70, 7-16-70, 2-27-72 and 5-6-74.

The first two failures were returned to Windsor at Combustion Engineering request. No failure analysis was given. The third and fourth failures will be analyzed on site when time permits. Symptoms on the last two failures were dis-similar thus leading to the.lonclusion that the failures are not of a generic nature.

Manufacturers Identification: Dynage 700-262, Serial Number 6960 n-.,-,, ---,.

, - - -

Retrieved from "https://kanterella.com/w/index.php?title=ML20085F953&oldid=4355435"