ML20086B207
| ML20086B207 | |
| Person / Time | |
|---|---|
| Site: | Fort Saint Vrain  |
| Issue date: | 11/14/1974 |
| From: | Mathie F, Swart F PUBLIC SERVICE CO. OF COLORADO |
| To: | |
| Shared Package | |
| ML20086B210 | List: |
| References | |
| AO-50-267-74-15, NUDOCS 8311170098 | |
| Download: ML20086B207 (7) | |
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Mr. E. Morris Howard, Director Directorate of Regulatory Operations Region IV, USAEC 10395 West Colfax, Room 200 Denver, Colorado 80215 s
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REF: Facility Operating License i
f No. DPR-34 Docket No. 50-267 t
Dear Mr. Howard:
Enclosed please find a copy of Abnormal Occurrence Report No. 50-267/74/15A and 50-267/74/19A, Finals, submitted per the requirements of the Technical Specifications.
1 Very truly yours, y
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Frederic E. Swart Superintendent Nuclear Production Fort St. Vrain Nuclear Generating Station FES:ll ec:
Mr. Angelo Giambusso a
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November 14, 1974 Mr. E. Morris Howard, Director Directorate of Regulatory Operations Region IV, USAEC 10395 b*est Colfax, Room 200 Denver, Colorado 80215 REF: Facility Operating License No. DPR-34 i
Docket No. 50-267
Dear Mr. Howard:
Enclosed please find a copy of Abnormal Occurrence Report No. 50-267/74/15A and 50-267/74/19A, Finals, submitted per the requirements of the Technical Specifications.
Very truly yours, f
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h Ng Frederic E. Swart Superintendent Nuclear Production Fort St. Vrain Nuclear Generating Station FES:il Mr. Angelo Giambusso cc:
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Date: Urivenhor 7, 1o74 FORT ST. VRAIN NUCLEAR GE!; CRATING STATION PUllLIC SERVICE CO:!PMiY OF COLORADO P. O. BOX 361 PLATTEVILLE, COLORADO 80651 REPORT No. 50-267/74/15A FINAL IDENTIFICATION OF OCCURRE"CE:
following a simulation
!!alfunction of load sequencing prograrmers, 4
of loss of outside pouer and main turbine trip, on Tuesday Aunust 6, 197.
This is considered an abnormal occurrence, per section 2.1 (f) of the Technical Specifications.
CONDITIO"5 PRIOR Routine Shutdoun
_ Steady State Power TO OCC"RRE"CT.: _
Routine Load Change llot Shutdevn
__0ther (specify)
X Cold Shutdoun P,vaetor in helium at _cnp y.frrgep.;
Refueling shutdcun atmosphery*c pressure Routine Startup The major plcnt paranctcrs at the tine of the event were as follous:
- RTR, O
INth Pouer
- ELECT, 0
_JNe Pressurc 0
psig Secondary Coolant
'F Temperature 0
~#/hr.
Flow 0
0 psig Pressure __
Primary Coolcnt
'F Core Inlet Temperature '100~
'F Core Outlet 100 Flow 0
- /hr.
Page 2 n( /
DESCRIPTION OF OCCURRENCS:
In preparation for running S/R $.6.16-SA, (Sinulating Loss of Outside I
Pouer and Main Turbine Trip) a nalfunction of contacts in one Diesel-Generator nain breaker cauced the 252 TX relays (load shedding) not to operate, and prevented any further auto action.
ANALYSIS OF OCCURRENCE:
The malfunction of contacts on the "B" Diesel Generator uain breaker, was caused due to loose screws holding the auxiliary switch ncchanisn; there-Both fore the switch raised, irstead of actuating the rotor of the switch.
generators started and cane to speed and voltage but did not load automatically.
APPARTIT CAUSE Unusual Service.Cond.
OF OCCURRE:CE:
X Design Including Environ.
Component Failurc b
Manufacture X
Installation /Const.
Other (specify)
Operator Procedure Screws not properly tightened initially.
CORRECTIVE ACTIO:::
A ceni-annual prorrn1 has been set up to conbat looco equipret?
in the diccci-generator brec.hers. To cliniate the retnon nade failure, a redundent para 11cl circuit sensing bus voltage has been proponed to and approved by the Directorate of Licensinh.
(See attached viring diagrans and letter Richard P. Devise to Richard F. Walker, Movember 5, 1974.)
TAILURE DATA /SIMILAR REPORTED OCCURRENCES:
This equipncat has r.ot fdiled in the past tests.
None
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PROG!ta.!P!ATIC TMPACT:
None CODE IMPACT:
Violation of singic failure criterf.a design.
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