ML20085L685
| ML20085L685 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 02/18/1975 |
| From: | Swart F PUBLIC SERVICE CO. OF COLORADO |
| To: | Howard E NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV) |
| Shared Package | |
| ML20085L684 | List: |
| References | |
| AO-50-267-75-6, NUDOCS 8311020340 | |
| Download: ML20085L685 (9) | |
Text
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\ public service company ce esende P. O. Box 361, Platteville, Colorado 80651
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, -s. February 18, 1975
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'Ql Mr. E. b rris Howard, Director Region IV, Office of Ir.spection I and Enforcement 611 Ryan Plaza Drive - Suite 1000 Arlington, Texas 76012 Ref: Facility Operating License No. DPR-34 l nocker Nn. 50-767
Dear Mr. Howard:
Enclosed please find a copy of Abnormal Occurrence Report No.
50-267/75/6, submitted per the requirements of the Technical Specifications.
Very truly yours,
! r.fc ile &n - i A e
Frederic E. Swart Superintendent Nucicar Production Public Service Company of Colorado FES:il ec: Mr. Angelo Giambusso go-r st%BB s
JMih n f't va an= e r z
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.O O REPk1RTDATE: February 10, 1975 ABNORMA1. OCCURRENCE OCCURRENCE DATE: February 2, 1975 FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO P. O. BOX 361 {
PLATTEVILLE, COLORADO 80651 -
REPORT No. 50-267/74/6 Preliminary IDENTIFICATION OF -
OCCURREFCE:
A gas vaste vacuum tank rupture disc ruptured releasing a small quantity of gas. This is 4.dentified as an Abnormal Occurrence per Technical Specification definition 2.1.c.
CONDITIONS PRIOR TO OCCURRENCE: Steady State Power Routine Shutdown Hot Shutdown ,, Routine Load Change-X Cold Shutdown Other (specify)
Refueling Shutdown Routine Startup The major plant paraceters at the time of the event were as follows:
Power Rtr -
HWth Elect. O MWe Secondary Coolant Pressure 1000 psig Temperature 210 'F (Feedwater on. pre-boiler recirculation)
Flow 180,000 #/hr.- .
Primary Coolant Pressure 230 psia ,
Temperature 254 *F Core Inlet
'254- '*F" Core Outlet
. Flow 90,000 #/hr.
l ,
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- -- = --.---- ---- -- ---- E i
A.-.-
o O Page 2
~
DESCRIPTION OF OCCURRENCE:
While attempting to drain "B" helium purification train water separator
,via HV-2382, with the separator level indication of 48", the opeartor j
drained the separator to 4" and closed HV-2382. Approximately one minute j 'later he received a gas vaste vacuum tank high pressure alarm and noticed *j l
the gas waste pressure and gas vaste flow high. The reactor operator ;
j suspected HV-2382 of not closing and dispatched an equipment operator to
! check regeneration system pressures. The equipment operator closed l PV-2352, the manual isolation for HV-2382 and isolated the blown rupture 1 l
}
dise M-63802.
4 APPARENT CAUSE OF OCCURRENCE: Design Unusual Service Cond.
l*
Including Environ.
' ~ Component Failure Manufacture X Installation /Const. Other (specify) 4
)
j Operator Procedure .
]
The air Operated dr fn :1: f:iled : clore preperly which elle"ed priscr" .
}
coolant helium to enter the regeneration system and be vented to the gas waste vacuum tank at a rate which exceeded the capacity of the two gas vaste compressors. .
{
ANALYSIS OF OCCURRENCE:
l The release from the rupture disc was about' 3 minutes in duration at
~100 ACFM. No increase in activity was detectable on the stack radiation monitors (RT-7324-1, 2 or 7325-1). Subsequent analysis of the gas in the I gas waste surge tank for release No. 77 showed no measurable gamma activity.
i The allowable release rate based on tritium was 3.9 (10 )7ACFM.
4 CORRECTIVE
! ACTION:
1 i When the reactor is depressurized to atmospheric pressure the valve (HV-2382) i will be isolated and disassembled for inspection and resolution of the problem.
Until that time the cooler will be drained manually with V-23203.
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o o Page 3 FAILURE DATA /
SIMILAR REPORTED OCCURRENCES: .
Abnormal Occurrences 50-267/74/21, 50-267/74/22, and 50-267/75/5 involved rupture of this rupture disc but the causes are unrelated. No. 74/21 was !
due to a release of gas from the gas waste compressor relief valves.
No. 74/22 was due to a pressure setting error in the operating procedure.
No. 75/5 was due to an improper valve lineup during a purge.
PROGRAFDfATIC IMPACT:
None CODE IMPACT:
None RECOMMENDED: APPROVED: ,
f L .0%~ k R.' Larry Brey fL F ederic E. Swart
, -s Superintendent-Operation {s perintendent-Nuclear Production Fort St. Vrain Nuclear : 'Public Service Company Generating Statian ,
of Colorado
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. REPORT DATE: February 10, 1975 ABNORMAI. OCCURRENCE
' OCCURRENCE DATE: February 2, 1975
- FORT ST. VRAIN NUCLEAR CENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO P. O. BOX 361 PLATTEVILLE, COLORADO 80651
- i
~
- , O u l REPORT NO. 50-267/74/6 1 / [.]
Preliminary V $g'
, IDENTIFICATION OF OCCURREFCE: -
A gas vaste vacuum tank rupture disc ruptured releasing a small quantity of. gas. This is identified as an Abnormal Occurrence per Technical Specification definition 2.1.c.
CONDITIONS PRIOR TO OCCURRENCE: Steady State Power Routine Shutdown Hot Shutdown Routine Load Change X Cold Shutdown Other (specify)
Refueling Shutdown . i Routine Startup The major plant parameters at the time of the event were as follows:
Power Rtr -
MWth .
Elect. O MWe Secondary Coolant Pressure 1000 psig Temperature 210 'F (Feedwater on pre-
, boiler recirculation)
Flow 180,000 #/hr. -
Primary Coolant Pressure 230 psia Temperature 254 *F Core Inlet 254 *F Core Outlet Flow 90,000 f/hr.
'J g n
GPYsurnasrow n .. . .
Page 2 e
4 DESCRIPTION OF OCCURRENCE:
While attempting to drain "B" helium purification train water separator via HV-2382, with the separator level indication of 48", the opeartor drained the separator to 4" and closed HV-2362. Approximately one minute .
later he received a gas waste vacuum tank high pressure alarm and noticed !
, the gas vaste pressure and gas vaste flow high. The reactor operator suspected HV-2382 of not closing .,nd dispatched an equipment operator to check regeneration system pressures. The equipment operator closed PV-2352, the manual isolation for HV-2382 and isolated the blown rupture dise M-63802.
APPARENT CAUSE OF OCCURRENCE:, Design Unusual Service Cond.
Including Environ.
Manufacture X Component Failure Installation /Const. Other (specify)
, Operator Procedure The air operated drain valve failed to close properly which allowed primary coolant helium to enter the regeneration system and be vented to the gas vaste vacuum tank at a rate which exceeded the capacity of the two gas vaste compressors.
ANALYSIS OF
- OCCURRENCE:
The release from the rupture disc was about 3 minutes in duration at I ~100 ACFM. No increase in activity was detectable on the stack radiation monitors (RT-7324-1, 2 or 7325-1). Subsequent analysis of the gas in the gas vaste surge tank for release No. 77 showed no measurable gamma activity.
The allowable release rate based on tritium was 3.9 (10 -)7 ACFM.
CORRECTIVE ACTION:
When the reactor is depressurized to atmospheric pressure the valve (HV-2382) will be isolated and disassembled for inspection and resolution of the problem.
Until that time the cooler will be drained manually with V-23203.
e e
.. , g
s~ :
'Page 3 FAILURE DATA /
SIMII.AR REPORTED OCCURRENCE.$:
' Abnormal Occurrences 50-267/74/21, 50-267/74/22, cad 50-267/75/5 involved rupture of this rupture disc but the causes are unrelated. No. 74/21 was !
due to a release of gas from the gas waste compressor relief valves.
No. 74/22 was due to a pressure setting error in the operating procedure.
No. 75/5 was due to an ic: proper valve lineup during a purge.
PROGRA>DfATIC IMP /,CT:
None CODE IMPACT: -
None REC 05BIENDED: APPROVED: 4
. f h'W II.' Larry Brey i%
ederic E. Swart
{
Superintendent-Operations perintendent-Nuclear Production Fort St. Vrain Nuclear P,ublic Service Company Cencrating Station of Colorado i
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