ML20085L683
| ML20085L683 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 04/02/1975 |
| 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-50-267-75-6A, NUDOCS 8311020331 | |
| Download: ML20085L683 (9) | |
Text
{{#Wiki_filter:, _ . o o P. O. Box 361, Platteville, Colo 80651 ffs r* [4 .. /, <\
' APjf,' 78/3 g2! April 2,1975
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Mr. E. I'. orris Novard, Director M'wcrdf' Region IVY Office of Inspection - 611 Ryan Plaza Drive Suite 1000 Arlington, Texas 76012 REF: Facility Operating License-No. DPR-34 Docket No. 50-267
Dear I;r. Uovard:
Enclosed please find a copy of Abnormal Occurrence Report No. 50-267/75/6A, Final, sub_.itted por the require.acnts of the Technical Specificatione. Very truly yours, Frederic E. Swart Supt. Nuclear Production N' N ,' Fort St. Vrain Nucicar Generating Station I FES?il cc lir. Ango.lo Gianbusso 8311020331 750402 MOI 2 PDR ADOCK 05000267 S PDR [- COPY SENT REGION .C
O . O REPORT DATE: March 21, 1975 ABWORMAL OCCURRENCE OCCURRENCE DATE: February 2, 1975
, FORT ST. VRAIN NUCLEAR GENERATING STATION PUBLIC SERVICE COMPANY OF COLORADO P. O. BOX 361 PLATTEVILLE, COLORADO 806S1 REPORT No. 50-267/74/6A Final I9ENTIFICATION OF OCCURRENCE:
A gas waste 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 I TO OCCURRENCE: Steady State Power Routine Shutdown llot shutdown i'.outine Lead Change X Cold Shutdown Other (specify) Refueling Shutdown Routine Startup
~
The major plant parameters at the time of the event were as follows:
- Power Rtr -
MWth Elcet. O MWe Secondary Coolant Pressure 1000 psig Temperature 210 *F~(Feedwater on pre-boiler recirculation) Flow 180,000 f/hr. . ! Primary Coolant Pressure 230 psia l Temperature 254 'F Core. Inlet I 254 '*F Core Outlet i Flow. 90,000' #/hr. l i ________________.____________..._____._________._____.___m__. .____J...____.___.___.___
o o e Pags 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 operator drained the separator to 4" and closed HV-2382. Approximately one minute later he received a gas waste vacuum tank high pressure alarm and noticed the gas waste pressure and gas waste flow high. The reactor operator suspected HV-2382 of not closing and dispatched an equipment operator to ch'eck 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 coolcnt helium to enter the regeneration system and be vented to the gas waste vacuum tank at a rate which exceeded the capacity of the tav ses waste compressors. ANALYSIS OF OCCURRENCE: ! .1he release from the rupture disc was about 3 minutes in duration at approx. , 100 ACFM. No increase in. activity was detectable on the stack radiation i monitors (RT-7324-1, 2 or 7325-1). Subsequent analysis of the gas in the gas waste surge tank for release No. 77 showed no measurable gamma activity. The allowable release rate based on tritium was 3.9 (10 )7 ACFM. i CORRECTIVE , 4 ACTION: ! With the reactor depressurized to atmospheric pressure the valve (HV-2382) ! was isolated and disassembled for inspection. HV-2382 was found to have a small piece of metal in the seat of the valve which prevented the-valve. from closing properly. The foreign object was removed, the valve seat repaired and the valve was rea_ssembled and tested. No further corrective action is planned.
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Pcgs 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. PROGRAMMATIC IMPACT: None CODE IMPACT: None i RECOMMENDED: APPROVED:
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. H. Larry Brky Superintendent-Operations
\ [FredericE. Swart Superintendent-Nuclear Production Public Service Company Fort St. Vrain Nuclear Generating Station of Colorado 9
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....: o o REPORT DATE: March 21, 1975 ABNORMAL OCCURRENCE OCCURRENCE DATE: February 2, 1975 FORT.ST. VRAIN NUCLEAR CENERATINC STATION PUBLIC SERVICE COMPANY OF COLORADO
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P. O. BOX 361 PLATTEVILLE, COLORADO 80651 4,l977
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REPORT No. 50-267/J476A j/ y .
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IDEhTIFICATION OF OCCURRENCE: A gas waste 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. CONDITIO"S PRIOR TO OCCURRENCE: Steady State Power Routine Shutdown Iiot. Shutdown Rau:. ". a Lwe
- CL;.u;;.
X Cold Shutdown Other (specify) Refueling Shutdown 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. g2
~~- 19 %
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. Pagc 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 operator drained the separator to 4" and closed HV-2382. Approximately one minute later he received a gas waste vacuum tank high pressure alarm and noticed the gas waste pressure and gas waste flow high. The reactor operator suspected HV-2382 of not closing and 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. i 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 ,llowed a primary j coolant helium to enter the regeneration system and be vented to the gas waste vacuum tank at a race which exceeded the capaulty of the twc gas waste compressors.
; ANALYSIS OF OCCURRENCE:
The release from the rupture disc was about 3 minutes in duration at approx. 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 waste surge tank for release No. 77 showed no measurable 7 gamma activity. ! The allowabic release rate based on tritium was 3.9 (10 ) ACFM. CORRECTIVE , 3 ACTION: . With the reactor depressurized to atmospheric pressure the valve (HV-2382) was isolated and disassembled for inspection. HV-2382 was found to have a small piece of metal in the' scat of the valve which prevented the valve from closing properly. The foreign object was removed, the valve seat repaired and the valve was reassembled and tested. No further corrective action is planned. G
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Pcg2 3 FAILURE DATA /
SIMILAR REPORTED OCCURRENCES: Abnormal occurrences 50-267/74/21, 50-267/74/22, and 50-267/75/5 No. involved 74/21 was rupture of this rupture disc but the causes are unrelated. due to a release of gas from the gas vaste 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. PROGRA>SfATId IMPACT: None CODE IMPACT: None RECOSDIENDED: APPROVED: CT .. (j ; .L e t- - L . c,4,v \
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Superintendent-Operations [FredericE. Swart Superintendent-Nuclear Production Public Service Company Fort St. Vrain Nuclear Generating Station of Colorado
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