ML19308A487: Difference between revisions
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{{#Wiki_filter:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ | {{#Wiki_filter:_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ | ||
o-w-- .. | o-w-- .. | ||
o =_ | o =_ | ||
; .'.'.2T 1D? CUT!i! ED1S0.1 CC1L*:21Y =:c::. arc: ac:=::.:.:~==::m::=cc::.~.~.ur:c:: _ | ; .'.'.2T 1D? CUT!i! ED1S0.1 CC1L*:21Y =:c::. arc: ac:=::.:.:~==::m::=cc::.~.~.ur:c:: _ | ||
l)d OLJ ~l., | l)d OLJ ~l., | ||
OST OFFICE GOX 460 MIDDLETOWN.PENNSYLVANM 17c67 TELEPHONE 717-G44-404T | OST OFFICE GOX 460 MIDDLETOWN.PENNSYLVANM 17c67 TELEPHONE 717-G44-404T June 13,1974 | ||
June 13,1974 | |||
. 0 | . 0 | ||
]D Hr. J.P. O'Re111y, Director ' | ]D Hr. J.P. O'Re111y, Director ' | ||
u.a JU Directorate of Regulatory a m, m T | u.a JU Directorate of Regulatory a m, m T | ||
D Region I - | D Region I - | ||
631 Park Annue | 631 Park Annue | ||
?.fr.g of Pressf a, Pa. 19406 a; _fb _- U_ _ h; a' , | ?.fr.g of Pressf a, Pa. 19406 a; _fb _- U_ _ h; a' , | ||
Operatina License DPR-50 Docket 50-239 4 , | |||
Operatina License DPR-50 | |||
Docket 50-239 | |||
4 , | |||
~ | ~ | ||
==Subject:== | ==Subject:== | ||
Abnormal Occurrence B6. A3 74-9 1 | Abnormal Occurrence B6. A3 74-9 1 | ||
==Dear Hr. O'Reilly:== | ==Dear Hr. O'Reilly:== | ||
r. | r. | ||
This teicqran is to confim the telecon between Lee Spessard (Region I-AEC), | This teicqran is to confim the telecon between Lee Spessard (Region I-AEC), | ||
| Line 71: | Line 41: | ||
On 11 June the iA Fake-up Pcm failed as a result of an aute:utic start with a closed suction valve. The autc atic pcrp start was caused by ardnsdvartent4 | On 11 June the iA Fake-up Pcm failed as a result of an aute:utic start with a closed suction valve. The autc atic pcrp start was caused by ardnsdvartent4 | ||
,, engineered safeguards signal. | ,, engineered safeguards signal. | ||
The inadvertent engineered safeguards signal occurred while investigating the cause for partially energized relsys in the unusi high pressure injection 1 # c circuits. , | The inadvertent engineered safeguards signal occurred while investigating the cause for partially energized relsys in the unusi high pressure injection 1 # c circuits. , | ||
The 1A ltke-up Pu,p was imediately stopped and'cause for autostic start was investfgated. | The 1A ltke-up Pu,p was imediately stopped and'cause for autostic start was investfgated. | ||
The investigation subsepently revealed that auteestic start of the 1A Fake-up Pt=p was prchably caused by unintentional actuation of a prtially encrgized pump logic start relay, , ,, | The investigation subsepently revealed that auteestic start of the 1A Fake-up Pt=p was prchably caused by unintentional actuation of a prtially encrgized pump logic start relay, , ,, | ||
Further investigation revealed that the pup logic start relay was maintained pzyttally emegized by excessive veltage applidation across the relay. The | Further investigation revealed that the pup logic start relay was maintained pzyttally emegized by excessive veltage applidation across the relay. The y f' ,, g | ||
y f' ,, g | |||
..o ~ | ..o ~ | ||
,.. 7 - | ,.. 7 - | ||
3 | 3 c- | ||
c- | |||
,r: . . >..* . . . ' | ,r: . . >..* . . . ' | ||
, f | , f | ||
. 'l | . 'l | ||
,.,', c | ,.,', c | ||
;,:p O | |||
;,:p | |||
O | |||
h ' | h ' | ||
'y@. . . | 'y@. . . | ||
y 0 W 91 0 8 5 0 & *f S | y 0 W 91 0 8 5 0 & *f S | ||
O- | O- | ||
>: . O. | >: . O. | ||
excess voltage across the relay was traced to incorrect incandesant type icws ~ | excess voltage across the relay was traced to incorrect incandesant type icws ~ | ||
installed in back-lighted push-buttons which are in series with the pep logic start relays. | installed in back-lighted push-buttons which are in series with the pep logic start relays. | ||
The incorrect incandest.nt type Ic.gs were replaced with correct type neon Itz;% | The incorrect incandest.nt type Ic.gs were replaced with correct type neon Itz;% | ||
Yery truly yo'urs, . | Yery truly yo'urs, . | ||
.. . ] 6s $}' m | .. . ] 6s $}' m | ||
.G. Merbe1n Station SuperirAendent | .G. Merbe1n Station SuperirAendent | ||
~ --THI-Nuclear Station | ~ --THI-Nuclear Station j. | ||
j | |||
~ ' | ~ ' | ||
fg k ; -- | fg k ; -- | ||
z.. ,,. . . | z.. ,,. . . | ||
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6 ....@) _3 | 6 ....@) _3 | ||
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Revision as of 12:08, 1 February 2020
| ML19308A487 | |
| Person / Time | |
|---|---|
| Site: | Three Mile Island  |
| Issue date: | 06/13/1974 |
| From: | Herbein J METROPOLITAN EDISON CO. |
| To: | |
| References | |
| NUDOCS 7910250669 | |
| Download: ML19308A487 (2) | |
Text
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
o-w-- ..
o =_
- .'.'.2T 1D? CUT!i! ED1S0.1 CC1L*
- 21Y =:c::. arc: ac:=::.:.:~==::m::=cc::.~.~.ur:c:: _
l)d OLJ ~l.,
OST OFFICE GOX 460 MIDDLETOWN.PENNSYLVANM 17c67 TELEPHONE 717-G44-404T June 13,1974
. 0
]D Hr. J.P. O'Re111y, Director '
u.a JU Directorate of Regulatory a m, m T
D Region I -
631 Park Annue
?.fr.g of Pressf a, Pa. 19406 a; _fb _- U_ _ h; a' ,
Operatina License DPR-50 Docket 50-239 4 ,
~
Subject:
Abnormal Occurrence B6. A3 74-9 1
Dear Hr. O'Reilly:
r.
This teicqran is to confim the telecon between Lee Spessard (Region I-AEC),
and J.G. RWaein (THI-Supstintendent) at 1800 39.5,11 June 1974.
The following report is sutaitted'in accordante with paragraph 6.7.2.a (page 6-11) of the Technical Specifiestiam. -
On 11 June the iA Fake-up Pcm failed as a result of an aute:utic start with a closed suction valve. The autc atic pcrp start was caused by ardnsdvartent4
,, engineered safeguards signal.
The inadvertent engineered safeguards signal occurred while investigating the cause for partially energized relsys in the unusi high pressure injection 1 # c circuits. ,
The 1A ltke-up Pu,p was imediately stopped and'cause for autostic start was investfgated.
The investigation subsepently revealed that auteestic start of the 1A Fake-up Pt=p was prchably caused by unintentional actuation of a prtially encrgized pump logic start relay, , ,,
Further investigation revealed that the pup logic start relay was maintained pzyttally emegized by excessive veltage applidation across the relay. The y f' ,, g
..o ~
,.. 7 -
3 c-
,r: . . >..* . . . '
, f
. 'l
,.,', c
- ,
- p O
h '
'y@. . .
y 0 W 91 0 8 5 0 & *f S
O-
>: . O.
excess voltage across the relay was traced to incorrect incandesant type icws ~
installed in back-lighted push-buttons which are in series with the pep logic start relays.
The incorrect incandest.nt type Ic.gs were replaced with correct type neon Itz;%
Yery truly yo'urs, .
.. . ] 6s $}' m
.G. Merbe1n Station SuperirAendent
~ --THI-Nuclear Station j.
~ '
fg k ; --
z.. ,,. . .
i.
' ; .-
n-s 9m g:
w c.
,. ..v. ,. . .
E O- .
.N :
~
Jb }
6 ....@) _3
- s 3
..e. ,
I* - , ,
,; . . > , ,- ,.n. .
= * *
. s' r
. z.
. . . s.
. cc. ,
. g *. . q l
t
.' ; - . -
. .. .i. . .
- . . .
. .y : '
L
. v.
.r. .
Q .. , l .
6 e . .
- ..
. . 1 s
.s. . ,
. 4.
, 1 l -)- s' d . g
' ~,
l ,
s l
L