ML20086B446
| ML20086B446 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 10/22/1974 |
| From: | Brey H, Rodgers W PUBLIC SERVICE CO. OF COLORADO |
| To: | Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML20086B449 | List: |
| References | |
| NUDOCS 8311170228 | |
| Download: ML20086B446 (3) | |
Text
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.. g P. O. Box 361, Platteville, Colorado 80651 cp,i. ',
October 22, 1974 x ), -w.7 s -
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lir. 2. Iforria Itcuard, Dircetor Directorate of Reguintory Operations ei..
J'r Region IV, U';A!:C D ' '. 'f
,4-U 19395 Ucst Colfax, Rcon 200
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Denver, Colorado 80215 j/
RFF: Facility Operatin?, Licensa
?ie. DP?.-34 Docket lio. 50-267
Dear Ifr.1:
otrard:
Eaclosed pleace find a ce;)y of Abnoraal Occurrence Report IIo.
50-267/74/lla, Final, culnitted per the requirennats of the Technical Specifications.
Very twly yours,
- 11. Larry Brcy Superintendent-0perations Fort St. Vrain : nclear Generating Station 1[LB:il cc: !!r. Angelo Ginubusco 9311170228 741022 PDR ADOCK 05000267 g
PDR 11000 sz.a&')
AcA S t
COPY SWI' REGION m
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y DATEi Octobc O S.,
1974
'NOIU!AL OCCURRENCE
- y FORT ST. VRAIN NUCLFAR CENERATING STATION
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PUBLIC SERVICE CO:!PANY OF COLORADO P. O. BOX 361 PIATTEVILLE, COLORADO 80651 REPORT NO. 50-267/74/lla FINAL -
1DENTIFICATIO:I OP OCCURRENCE: -
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The following is considered an Abnormal Occurrence under definition of 2.1 e of the Technical Specifications.
On 6/25/74 under gas vaste release number 50 it was noted that the release took an excessive length of time and when the A receiver was empty flow continued from a leak through the B receiver outlet valve.
CONDITIONS PRIOR TO OCCURRENCE:
Steady State Power Routine Shutdown n:
Hot Shutdown Routine Load Change Cold Chutdoun X
Other - (specif y)
Refueling Shutdown Prior to low power Routine Startup physics tests A-9 The major plant parameterr, at the time of the event were as follows:
Power
- PTR, N/A MWth
- ELECT, N/A MWc Secondary Coolant Pressure n/A psig Temperaturc N/A
'F Flow N/A f/hr.
Primary Coolant Pressure 0
~psig Temperature 135
'F Core Inlet 335
~*F Core Outlet
/
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Flev O
f/hr.-
9 4
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. o Page 2 o
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Df;CHIPTION OF OCCUn!!Er.qP:
On 6/25/74 gas vaste release number 50 from the A receiver was started
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c at 0100 and this receiver was not empty until 0045 on 6/28/74. The 72 hour8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> period is too long for a rcIcase of the tank volume at the controlled rate of 15 acfm.
With the A receiver empty and isolated a flow of 4 acim was indicated on FT-6351 flow transmitter.
This indicated a lenhage from the B receiver.
Plant troubic report 6-395 was written on the valve leakage.
Tank analysis showed no radioactive material was released.
APPARENT CAUSE
_OF OCCURRENCE:
Design Unusual Service Cond.
Including Environ.
1 1
Manufacture
'X Component Failure Installation /
Other (specify)
Const.
Operator
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Procedurc On 7/3/74 the B gas waste receiver outlet isolation valve was dismantled 1
and it:was found to be defective, causing the Icakage.
i ANALYSIS OF
_0CCURRENCE:
E Analysis of the system shows that the valve leakage could.not be' determined, using the Systcm Operating Procedure.as-uritten, -until. the "A". receiver was empty. No radioactive material was present in the B receiver.
1 CORRECTIVE ACTION:
1 A second isolation valve vill he added to each gas vaste rccciver outlet with a vent valve from the innerspace which vents to the vacuum tank.
This will assure. that no gas can.lcak from a tank to the vent system.
A change in SOP-63 will assure that. FT-6351 shows no flow prior to the start of the discharge.
New valves have been received and will be installed shortly.
1 FAILURE DATA /SIMILAR REPORTED OCCURRENCES j
't Nonc 4
PROGRAMMATIC IMPACT h'
No programmatic 3mpact expected.
CODE IMPACT g
None a
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2, b h W. Duanc Rodgers, operations Supv.
H.Larryurcy{ supt.
o operations y
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