ML19262A217
| ML19262A217 | |
| Person / Time | |
|---|---|
| Site: | Crane  |
| Issue date: | 09/30/1974 |
| From: | Arnold R METROPOLITAN EDISON CO. |
| To: | Schwencer A US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| GEL-0366, GEL-366, NUDOCS 7910260558 | |
| Download: ML19262A217 (18) | |
Text
.
e AEC DISTRIBUTION FOR PART 50 DOCKET MATERIAL (TEMPORARY FORM)
CONTROL NO-10222 FlLE:
F ROM: Metropolitan Edison DATE OF DOC DATE REC'D LTR TWX RPT OThER MabnSidPa 19063 9-30-74 10-3-74 XX TO:
ORIG CC OTHER SENT AEC PDR XX SENT LOCAL PDR XX ur 9chwencer 1 signed CLASS UNCLASS PROPiNFO INPUT NO CYS REC'D DOCKET NO:
XXXX 1
50-289 DESCRIPTION:
ENCLOSURES:
Ltr re our ltr dtd 7-26-74....... furnishinc d N o t F Eil.t. fir >
additional info in regards to the Reactor Building Spray Pump motors........w/Attch..
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PLANT N AME: Three Mile Island #1 FOR ACTION /lNFORMATION 10-10-74 ehf BUTLER (L)
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TEL EPHOSE 215 - 0:0 ^6G SEP 3 01974 GEL 0366
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Mr. A. Schwencer, Chief Light ' dater Reactors Branch 2-3 Directorate of Licensing Office of Regulation U. S. Atomic Energy Cen=ission f4as hingte n, D.
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Dear Mr. Schwencer:
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Subject:
Three Mile Island Unit 1 mg y
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it Reactor Building Spray Pump Motors
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Reference:
AEC Letter Dated July 26,19Th oc'2',y' A4,'
,y from Mr. A. Schwencer to Mr. R. C. Arnold 4 4
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v Metropolitan Edisen Ccmpany letter dated J'i3 F September 13, 19Th, to Mr. A. Schwencer frca Mr. R. C. Arnold Metropolitan Edison Cc=pany letter dated February 4, 1974, to Dr. D. R. inuth from Mr. J. G. Miller This is in further response to your letter of July 26,197h, which questioned the ability of the reactor building apray pump totors to accelerate under degraded off-site pcVer conditions.
My letter of September 13,197h, indicated that we would furnish an additional analysis with regard to possible starting voltage drop and acceleration times for the spray pump motors in the event of the improbable occurrence of 230 KV systen voltage o f 9 5. 6 ~, c -
The basic assumptions utilized in the analysis, Attachment A, were that there was only one of three 230 KV lines availat.' e for plant cperation and that in addition there was no supply from the TMI Unit i generator, a highly improbable cperating condition in that the reactor may not be made critical with less than two 230 W lines in service ncr may operations be continued with only one 230 C line in service unless Unit 1 generator is carrying its own auxiliaries (!MI-l Technical Specifications, para. 3.7.2).
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'4r. A. Schwencer SEP 3 01974 It was also assumed that one unit auxiliary transformer was cut of service and all auxiliary loads were supplied by one tr1nsformer and that all units of Brunner Island, a nearby fossile station, were not in service, another highly improbable operating condition.
We believe these assumptions meet with the conditions specified for analysis in your letter of July 26,197h, in spite of the unrealistic aspect.
It should be noted that the Metropolitan Edison Cc=pany has not in the past, and does not intend in the future, to accomplish system voltage reductions by reduction of the voltage en the 230 and 500 K7 transmission lines.
As indicated in the TMI-l FSAR, page 6-15, paragraph 6.2.3, the building spray pumps are required to deliver 3,000 rpm within 37.5 seconI, after the reactor building pressure reaches the actuation set point.
This required time also includes 10 seconds for starting of the diesel and cringing it up to speed.
In the event that spray pumps are fed by the auxiliary trans-formers in lieu of the diesels, all safeguards loads vill be started essentially 10 seconds scener. See TMI-l FSAR, page 3-9 and 3-10, paragraph S.2.3.lb.
Consequently, the folleving sequence of events was assumed to occur in the event of an ES signal (over pressure in the reacter building) and loss of voltage on the L160 engineered safeguards bus.
Assumed Time Actual Time Initiation of ES signal and loss of voltage en ES bus 0
0 Diesel generator up to rated speed
<10 sec.
<10 sec.
Safeguard lead block 4 breakers cicse
<13 sec.
16.2 sec.*
cn ES bus Building spray pumps at rated speed
_6 sec.
5 02 sec.**
Total 3h sec.
31.22 sec.
- Test result.
- Calculated.
In the event of an ES signal with the system, rather than the diesels, cen-tinuing to feed the safeguard buses the folicving events vould cccur:
Initiaticn of an ES signal 0
310ck k leading 16.2 sec.
Building spray pumps at rated speed and f1cv 6.* sec.
Total 22.' sec.
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Mr..A. Schwencer SEP 3 0 574 Metrcpolitan Edison Cc=pany continues to maintain, as described in our letter of February L, 197h, that the diesel generator as a power scurce represents the worst case condition for starting the spray pu=p =ctor. corrects a calculation which was made in the Metropolitan Edison Cc=pany letter to you dated September 13, 1975, wherein we indicated a voltage drop at the motor terminals to a value of 96.385 cf naceplate rating. The corrected value is 97.k25.
This does not affect th_ ccnclusions reached in this analysis.
If we can 'ce of further assistance, please feel free to contact us.
Sincerely,
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R. C. Afhold Vice cresident RCA:RFJ:3h Attachments--A and 3 cc: Cecrge F. T owbridge, Esq.
Miss Mary 7.
30uthard, Chairman Chauncey R. Kepford, Esq.
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