ML20148F289
| ML20148F289 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 12/11/1974 |
| From: | Heider L YANKEE ATOMIC ELECTRIC CO. |
| To: | James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I) |
| References | |
| WYR-74-52, NUDOCS 8011040743 | |
| Download: ML20148F289 (3) | |
Text
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,,,., n. s, n YAN/WE MOMiG ELECLIC COMPANY h
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WYT. 74-52
% /bbYe 20 Turnpske Road Wessborough, Mossochusetts 01581
.s Deceinber 11, 1974 E,_-
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Unitod States Ator.ic Ir. orgy Consnission
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Directorate of P.egulatory Cperations Region I k
G31 Park Avenue 8
King of' Prussia, Pennsylvania 19406 Attention.
James P. o'neilly, Director
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THIS DOCUMENT CONTAINS neference, ueense so. DPR-3 (Docket No. 50-29)
D*ar Sir:
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In accordance with Section E.2.b, Appendix "A" Technical Speelfications k
of the Reference License the following Unusual Event is reported.
I A review of ECCS two train pump flow indicated that the data did not
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support the assumptions used in the accident analysis.
In fact, the flow
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for two of the three trains as determined from s;hield tank cavity level change and the average flow as measured by the flow instrumentation is as followst L..[
cavity Level change Ins trurwnta tion I
Tratna 1 ard 2 1-2290 vpm 2100 gpm i
Trains 2 and 3 2278 gpm 2220 gra Trains 1 and 3 2271 gpa 2320 gpn hse VCues are consistent with the initial design criteria for the
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energency core cooling system.
- However, Westinghouce in the Eccs analysis was 2400 gpm.the two train pump flow used by
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This was an input error.
The taxh allovable peak linear heat generation rate calculated for the Yankee Rove core using this erroneous value was 13.06 kv/ft.
When this error was veri.fied, the plant was administratively derated
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to 90 % o f f ull powe r (a resultant power level of $40 MVt) as a conservative wacure pending further investigation.
This investigation by Yankee Atomic Eloctric Corpany has concluded that operation at er below 11.6 kv/f t will conservatively r.aintain all safety margins previously indicated in the Et"TS cnalyses.
In-core teeasurnments at the plant verity that the 11.6 kw/f t linear heat generation rate lini,t will not be exceeded by operation at 1004 plant output (600 MWt).
icos on December 9,1974.
Plant output was accordingly increased to h Directorate of Licensing was inforr.ed of the i
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United States Atonic Energy Cersnission Deceanber 11, 1974 Attns James P. O'Reilly, Director page Two probica and Yankee Atoetic Electric coespany inmediately began preparation of a cupplerent to our Proposed Change No.117 to account f'or the error.
A review of Core M' operating data confirms that the peak linear heat i
generation rate did not exceed 11.6 kw/f t durin7 that cycle.
During the period. between Septear.ber 9,1974, and Decociser 6, 1974, the conservative limit of 11.6 kw/f t was exceeded at some points.
-It should be recognized E
that until the results of a revised ECCS analysis are available, it cannot i
be concluded that the operating conditions during that period were such that the applicable ICCS criteria were, in fact, not met.
We are currently discussing the problem with Westinghouse and desire to have a revised analysis perforr.ed as soon as possible.
The resulta vill be submitted to the Directorate of Licensing as soon as they are availcble and we shall keep the Dire ctorate of Licensing inforned as to r.chedule.
.Very truly yours,
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YAMKEE ATONIC ELECTRIC ANY L. H. Raider Asst. Vice President.
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UTIDN FOR ? ART 50 DOCKET.1kRI AL, EC DIST, (T E T.;F O R A R Y. F O R T.;)
CONTROL NO: 127h3 FILE: m FRO?.1: Yankee Atomic Elec. Co.
DATE OF COC D ATE R EC'D LTR T'.'lX RPT OTHER Westborough, Mass. 01581 X
12 11-7h 19-18 7h ORIG CC OTHER SENT AEC PDR XX u
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To.
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SENT LOCAL PDR DRO CLAS$
U ! CLASS PROPINFO INPUT NO CYS REC'D DOCKET NO:
1 50-29 XXX ENCLOSURES:
DESCRI?TiO:::
Ltr reporting an Unueual Event involving ECCS two train pump flow indicated in that the data did not support the assumptions ased in the n
n-accident analysis.....
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