ML20249B223: Difference between revisions
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{{#Wiki_filter:e | {{#Wiki_filter:e y W3 | ||
%+%c.y W Cy (rW V ~~ | |||
PRELIMINARYNOTIFICATidN'0FEVENTORUNUSUAL0CCURRENCE --PNO-76-34A Thin preliminary notification constitutes EARLY notica of evrnts of POSSIBLE safety or public interest significance. The information presented is as initially received without verification or evaluation | w gj vu y tr 4.v wv a- | ||
and is basically all that is known by OIE staff as of 4:00 P.M. on date of this notification. | ~~~vtj wuu | ||
~ | |||
PRELIMINARYNOTIFICATidN'0FEVENTORUNUSUAL0CCURRENCE --PNO-76-34A Thin preliminary notification constitutes EARLY notica of evrnts of POSSIBLE safety or public interest significance. | |||
The information presented is as initially received without verification or evaluation and is basically all that is known by OIE staff as of 4:00 P.M. on date of this notification. | |||
IT SHOULD BE SPECIFICALLY NOTED THAT THIS l | |||
NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO | |||
{ | { | ||
BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT | BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT j | ||
Facility: | NOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) SUBSEQUENTLY WILL BE ISSUED IF WARRANTED. | ||
Facility: | |||
Portland General Electric Company (TROJAN) | |||
) | |||
==Subject:== | ==Subject:== | ||
Failure of Auxiliary Feedwater Pumps to Start Automatically Following Turbine and Reactor Trip The following information which supplements the information contained in | Failure of Auxiliary Feedwater Pumps to Start Automatically Following Turbine and Reactor Trip The following information which supplements the information contained in PNO-76-34, was obtained through telephone contacts between the Region.V (Walnut Creek, California) office and the licensee on March 3 and 4. | ||
The licensee reported to Region V that their investigation has revealed the cause of the turbine / reactor trip on February 29, 1976 to be a l | |||
The licensee reported to Region V that their investigation has revealed the cause of the turbine / reactor trip on February 29, 1976 to be a | wiring error in differential current protective relays in the plant's electrical distribution system, such that the protective relays were erroneously sensing differential currents between phases of the electrical distribution transformers. | ||
Investigation by the licensee has revealed 39 damaged tubes in the plant's main turbine condenser. The damage occurred as the result of baffle and divider plate movement within the condenser following load rejection on 3 | |||
Investigation by the licensee has revealed 39 damaged tubes in the plant's main turbine condenser. The damage occurred as the result of baffle and | February 29, 1976. | ||
divider plate movement within the condenser following load rejection on | |||
The licensee reported plans for the issuance of a press release on March 4. | The licensee reported plans for the issuance of a press release on March 4. | ||
The earliest tentative estimate, by the licensee, for a return to. power operation is late in the week ending March 12. Modifications to and, pre- | The earliest tentative estimate, by the licensee, for a return to. power operation is late in the week ending March 12. Modifications to and, pre-operational testing of the Auxiliary Feedwater Systems are expected to.be 1 | ||
i | l the controlling activities in the length of the shutdown. | ||
/\\ | |||
i | |||
==Contact:== | ==Contact:== | ||
GHSmith, IE x27261 | GHSmith, IE x27261 GWRoy, IE x27261 DIhompson, IE x 27541 p,.... | ||
y Distribution: | |||
p, . . . . | 4 Chairman Anders Commissioner Mason S. J. Chilk, SECY d | ||
Chairman Anders | i Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE h | ||
Commissioner Kennedy C. C. Kammerer, CA L. V. Gossick, J. G. Davis, OIE J. A. Harris, PA B. C. Rusche, NRR J. La Fleur, ISP T. J. McTiernan, AIA j | |||
K. R. Chapman, NHSS H. K. Shapar, ELD Transmitted: | |||
\ | P BldgM*/,fo ; H St //.'/61; MNBB 48'2.35; Luge D f | ||
N f | |||
\\ | |||
PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLDSURE t | PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLDSURE t | ||
1 | 1 | ||
.... - n i | |||
9906220199 760304 | 9906220199 760304 PDR I4 E PNO-76-034A PDR L | ||
PDR | ___ _ _ _ _ _}} | ||
PNO-76-034A | |||
Latest revision as of 14:08, 30 November 2024
| ML20249B223 | |
| Person / Time | |
|---|---|
| Site: | Trojan File:Portland General Electric icon.png |
| Issue date: | 03/04/1976 |
| From: | Roy G, Galen Smith, Thompson D NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-76-034A, PNO-76-34A, NUDOCS 9806220199 | |
| Download: ML20249B223 (1) | |
Text
e y W3
%+%c.y W Cy (rW V ~~
w gj vu y tr 4.v wv a-
~~~vtj wuu
~
PRELIMINARYNOTIFICATidN'0FEVENTORUNUSUAL0CCURRENCE --PNO-76-34A Thin preliminary notification constitutes EARLY notica of evrnts of POSSIBLE safety or public interest significance.
The information presented is as initially received without verification or evaluation and is basically all that is known by OIE staff as of 4:00 P.M. on date of this notification.
IT SHOULD BE SPECIFICALLY NOTED THAT THIS l
NOTIFICATION MAY CONTAIN INFORMATION THAT LATER MAY BE DETERMINED TO
{
BE INACCURATE OR INCONSISTENT. AN OFFICE OF INSPECTION AND ENFORCEMENT j
NOTIFICATION OF AN INCIDENT OR OCCURRENCE (BLUE SHEET) SUBSEQUENTLY WILL BE ISSUED IF WARRANTED.
Facility:
Portland General Electric Company (TROJAN)
)
Subject:
Failure of Auxiliary Feedwater Pumps to Start Automatically Following Turbine and Reactor Trip The following information which supplements the information contained in PNO-76-34, was obtained through telephone contacts between the Region.V (Walnut Creek, California) office and the licensee on March 3 and 4.
The licensee reported to Region V that their investigation has revealed the cause of the turbine / reactor trip on February 29, 1976 to be a l
wiring error in differential current protective relays in the plant's electrical distribution system, such that the protective relays were erroneously sensing differential currents between phases of the electrical distribution transformers.
Investigation by the licensee has revealed 39 damaged tubes in the plant's main turbine condenser. The damage occurred as the result of baffle and divider plate movement within the condenser following load rejection on 3
February 29, 1976.
The licensee reported plans for the issuance of a press release on March 4.
The earliest tentative estimate, by the licensee, for a return to. power operation is late in the week ending March 12. Modifications to and, pre-operational testing of the Auxiliary Feedwater Systems are expected to.be 1
l the controlling activities in the length of the shutdown.
/\\
i
Contact:
GHSmith, IE x27261 GWRoy, IE x27261 DIhompson, IE x 27541 p,....
y Distribution:
4 Chairman Anders Commissioner Mason S. J. Chilk, SECY d
i Commissioner Gilinsky Commissioner Rowden G. F. Murphy, JCAE h
Commissioner Kennedy C. C. Kammerer, CA L. V. Gossick, J. G. Davis, OIE J. A. Harris, PA B. C. Rusche, NRR J. La Fleur, ISP T. J. McTiernan, AIA j
K. R. Chapman, NHSS H. K. Shapar, ELD Transmitted:
P BldgM*/,fo ; H St //.'/61; MNBB 48'2.35; Luge D f
N f
\\
PRELIMINARY NOTIFICATION - NOT FOR PUBLIC DISCLDSURE t
1
.... - n i
9906220199 760304 PDR I4 E PNO-76-034A PDR L
___ _ _ _ _ _