ML19259C069
| ML19259C069 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 05/24/1979 |
| From: | Reinaldo Rodriguez SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | Doug Garner Office of Nuclear Reactor Regulation |
| References | |
| NUDOCS 7906120315 | |
| Download: ML19259C069 (2) | |
Text
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sAcuutmo uuNICW UlluTY DISTRICT O 6201 5 stmet saa 15a30 Sacemento
, a ornia 95414 (Ste 453 Hay 24, 1979 orf ace of Nuclear Reactor Regulation
- T A u. orion:
ur. u.= c.=ner, neanch 4
-- Tgis DOCUMERT COMTAlMS U. S. Nuclear Regulatory commaission W. A ungton, D. C. 20355 POOR QUAN Door Hr. Caramr:
NRC, by telephoneAt t. ached is a table enn==4ri$1ng information giv yesterday morning concerning past turbine and feedwaten to Mr. S tui t iat t ug uvessem.
er tu e4ev one (1), the reactot (olluwind 4 turbine trip.
tripped on hips pressure 5.4 eveoads la came tuo (2),
the reactor tripped on an overpower indicati clio.11ow4ble reactor coolant flow condition.
on for titp prior to the norm 411y expecten higit This rupressats a trip due ocating. to the conservative method ur.ed for reactreactor coolant prest'urd or coolant flose C ca three (3) remetor trip parameters were not exceeded.and four (4) are turbi whose caou ttvs (5) is a trip of one feedwater pump (one was out of service) 4 rrum 3r$% pemer.
'Ibe initial indicatice of d
.econda be fo re the ramctor trip on high pressure.egraddd Tiow occurred 10 C4se six (6) waes a rapid reduction of feachrater from 727 p
%. m.ine first prior to the reaccor trip on high pressure.indicacion of degraded flow o enser.
We teol the installation of the direct reactor trip on tusbine trip will result in a decrease of five ($) plus seconds before the morasily expected hi gh preneure crip.
The direct wiii aemult in 4 simitar darreame compared to the renetor coolant hi hreacto g
ps conute ttip.
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driguez Manager, Nuclea Ope rat h= =
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Case Rx. Power J,nJ_c_f sting Event Time to Reactor Trip 1
1002 '~
Turbina crip
_1.4 secanda high pressure 2
1001 Turbine trip 3.8 seconds puusr/iabalance/ flow 3
100%
Turbine trip Rasctor trip paranaters act exceeded 1002 Turbina trip Raictor trip parassacers not exceeded 3
3tiI Feed pumps Approximately 10 seconds tripped high pressure ri 72%
Rapid Esedpump/
Apprezimately 9 seconds ~
fe4&= tar runback high pressura 6
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