ML19317G039
| ML19317G039 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 10/18/1976 |
| From: | Colombo R SACRAMENTO MUNICIPAL UTILITY DISTRICT |
| To: | |
| Shared Package | |
| ML19317F907 | List: |
| References | |
| NUDOCS 8002210741 | |
| Download: ML19317G039 (1) | |
Text
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UCENSEE EVENT REF.
CONTROL BLOCK:l l
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[PLEASE PRINT ALL REGUIRED INFORMATION)
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8 NE WYP V
UCENSE NUM8ER PE a1 lC l A l Rl Sl Sl 1l l0l0l-l0l010l0l0l-l0l0l l4 l1 l 1l ll 11 l0l1l 7 89 14 15 25 26 30 31 32 R1C CoCKET NUMBER EVENT cATE REPORT DATE CATEGORY TYPE O 1 CON'T l P l 0 l W y l0 l 5 l 0 l-l 0 l 3l 1l 2l l1 l0 l0 l 7 l 7l 6l l1 l0 l1 l8 l 7 l 6 l 7 8 57 58 59 60 61 68 69 74 75 80 EVENT DESCRPTION
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HE I On October 7,1976 the reactor was taken less than-1%Ak/k actual shutdown, with RCS l.
7 89 80 y 0
l temoerature less than 200*F.
This situation is outside the assumptions made in the l
7 89 80 3E l safety analysis for the eiected rod accident. At all ticies adecuate shutdown margin l 7 89 80 -
3E l existed, and boron iniection to-1%Ak/k shutdown was initiated immediately.
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7 89 80 EE l (RO-76-12) l -
7 89 80 -<
m CE CE COMPONENT CODE ACTURER VOLATON h lR lB l d l C l O l Nl R} O l D l lNl l Bl 0l 1l 5l lN l 7 89 10 11 12 17 43 44 47 48
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D CAUSE DESCRIPTION
@ l Technical Specifications do not prohibit this mode, however, it is an unsaf'e condition l,
7 89 80
- UE l Direction will be given to not go less than 1%Ak/k shutdown unless approaching l
7 89 80 I 10 l criticality. An error in interpreting shutdown calculation led to the incident.
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'sE "c's$cvERY s power otsER status osCOVERY CESCRSTON '
W l0l0l0l l NA l
lA ]
l NA l
1 7 8 9
10 12 13 44 45 48 80 ACTMTV CONTENT AMOUNT OF ACTMTV LCCAJ oF RELEASE I
RELEASED OF RELEASE l y
NA l
l NA l
EE W
7 8 9
10 11 44 45 80-PERSONNEL EXPOSURES NUMBER TYPE CESCRIPTON DIE lel0l01 yl NA l
7 89 11 12 13 80.-
PERSONNEL INJURIES NUM8ER CESCRIPTON 3
E[
0l0l0l l NA l
7 89 11 12 80 0FFSITE CONSEQUENCES E l Mfnf-n1 l '
to none.
7 89 80 [
LOSS OR DAMAGE TO FAC:LITY TYPE DESCArPTON f
32 [.Z_j l
NA l
Z 7 89 10 80 PUBUClTY BE l Local newspapers notified October 13, 1976.
l 7 09 80
,,I ADDITIONAL FACT 0AS l Actual Shutdown calculation will be revised to better define what parameters mean.
l 8o0221o</97 e
7 09 80 R. W. Colombo /F. T. Eisenhuth PHONE: (916) 452-3211 NAME:
spo ess.est i
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